This work was supported by the National Natural Science Foundation of China (Grant No. 51290292) and was also supported by the Academic Excellence Foundation of BUAA for PhD students.

1. Photolithography on Stainless Steel
<ol>
	<li>Design the photomask using a mechanical drawing software and fabricate the design by submitting it to a photomask printer4.</li>
	<li>Wash the stainless steel (316 SS; lengthx width: 4 cm x 4 cm, thickness: 1 mm) by rinsing it in alkaline solutions (50 g/L NaOH and 40 g/L Na2CO3) at room temperature for 15 min to remove oil contaminants.</li>
	<li>Thoroughly clean the stainless steel by performing ultrasonic cleaning in an ultrasonic cleaning machine (working frequency: 40 KHz, ultrasonic power: 500 W). Rinse it sequentially with deionized water, n-hexane, acetone, and ethanol for 10 min each.</li>
	<li>Dry the stainless steel by placing it on a hot plate at 150 &#176;C for 30 min. Protect the stainless steel by covering it with a sheet of aluminum (Al) foil.</li>
	<li>Place the stainless steel on the center of a spin coater. Use a dropper to deposit positive photoresist (about 1 mL) onto the stainless steel, from the center to the edge, until the photoresist completely covers the stainless steel. Avoid bubble formation in the photoresist.
	<ol>
		<li>Perform spin-coating, first with a speed of 700 rpm/min for 6 s, to start the spin cycle, and then with a speed of 1,500 rpm/min for 15 s, to evenly spread the photoresist.</li>
	</ol>
	</li>
	<li>Release the vacuum valve and retrieve the stainless steel using a pair of tweezers. Place the stainless steel on a hot plate at 120 &#176;C for 2 min to bake the photoresist.</li>
	<li>Place the stainless steel on the vacuum valve of a photolithography machine. Set the exposure time of the photolithography machine to 25 s. 
	NOTE: Here, the photolithography machine is a contact aligner with an ultraviolet (UV) light wavelength of 254 nm and a light intensity of 13 mW/cm2.</li>
	<li>Release the stainless steel and place it in the developer solution for 1 min to remove the photoresist without exposing it to the UV light. Remove the stainless steel from the developer solution, wash it with deionized water, and dry it under N2 gas.</li>
	<li>Place the stainless steel on a hot plate to bake at 120 &#176;C for 2 min.</li>
	<li>Use an upright microscope with a magnification of 100x to observe the surface of the stainless steel to inspect the obtained photoresist texture.</li>
</ol>
2. Chemical Etching of Stainless Steel
<ol>
	<li>Prepare a chemical etching solution with a volume of 200 mL (400 g/L FeCl3, 20 g/L phosphoric acid, and 100 g/L hydrochloric acid) in a 500-mL beaker.</li>
	<li>Place the stainless steel with photoresist texture in the chemical solution for 10 min. Do not allow the stainless-steel pieces to contact each other. Place a maximum of four stainless steel pieces at one time.</li>
	<li>Take out of the chemically etched stainless steel using tweezers, wash the pieces with deionized water for 1 min, and dry them with N2 gas.</li>
	<li>Remove the photoresist texture by submerging the stainless steel in acetone for ultrasonic cleaning for 5 min. Then, dry the chemically etched stainless steel with N2 gas.</li>
</ol>
3. OTS Self-assembly on Chemically Etched Stainless Steel
<ol>
	<li>Clean the chemically etched stainless steel with a steady stream of deionized water, dry it with N2 gas, and place it on a hot plate at 100 &#176;C for 30 min to completely dry the surface.</li>
	<li>Hydroxylate the chemically etched stainless steel with an O2 plasma treatment in an RF plasma machine, with an RF power of 100 W for 10 min, a system pressure of 100 mbar, and a flow rate of 20 sccm.</li>
	<li>Prepare 1 mM OTS solution in anhydrous toluene in a beaker. Dry the beaker thoroughly before solution preparation.</li>
	<li>Rinse the chemically etched stainless steel with the OTS solution for 4 h at room temperature. Place the beaker in a sealed bag. Do not allow the stainless steel pieces to contact each other.</li>
	<li>Remove the stainless steel, clean it with anhydrous toluene by performing ultrasonic cleaning for 10 min, and dry it with N2 gas.</li>
</ol>
4. Slippery Surface Preparation
<ol>
	<li>Deposit approximately 10 mL/cm2 silicone oil (viscosity: 350 cst; surface tension: 21.1 mN/m) onto the OTS-coated, chemically etched stainless steel using a dropper.</li>
	<li>Use an optical stereomicroscope to observe the wetting process of the silicone oil on the stainless-steel surface (magnification of 10x).</li>
	<li>Remove the excess silicone oil by placing the stainless steel in a vertical position for 1 h.</li>
</ol>
5. Investigation of Water Sliding Behavior on Slippery Surfaces
<ol>
	<li>Deposit a 4-&#181;L water droplet on the slippery surface. Place the stainless steel under an optical microscope and tilt the substrate by ~2&#176;.</li>
	<li>Visualize the water droplet sliding on the slippery surface at a low magnification (50x) to check that the slippery surface has the easy sliding property.</li>
</ol>
6. Analysis of Anti-wetting on the Slippery Surface at High Temperatures
<ol>
	<li>Place the stainless steel with a slippery surface on a hot plate using tweezers. Set the hot plate at different high temperatures (i.e., 200 &#176;C, 250 &#176;C, and 300 &#176;C) to analyze the anti-wetting behaviors at different temperatures. 
	NOTE: Do not directly touch the high-temperature stainless steel with hands.</li>
	<li>Use a micro-syringe to deposit a 10-&#181;L water droplet on the slippery surface. 
	NOTE: Before dropping the water droplet, the temperature of the slippery surface should reach equilibrium.</li>
	<li>Use a high-speed camera to record the water droplet movement at a frame rate of 500 Hz.
	<ol>
		<li>Fix the camera to a tripod and direct the lens of the camera toward the stainless steel. Adjust the focus of the camera to obtain a clear water droplet image. Record the movement of the water droplet on the stainless-steel surface by pushing the start button of the camera. Push the end button of the camera when the water droplet slides off the stainless steel to complete the recording.</li>
	</ol>
	</li>
</ol>
7. Analysis of the Anti-adhesion Effects of the Slippery Surface on Soft Tissue
<ol>
	<li>Use a manipulator, a dynamometer, a hot plate, and a stationary fixture to set up an adhesion force measurement platform4, as shown in Figure 3a.</li>
	<li>Place the test surface on the hot plate. Use a clamp to fix the stainless steel on the plate. Heat the test surface to a certain high temperature (e.g., 300 &#176;C). 
	NOTE: The test surface should closely contact the hot plate to ensure efficient heat transport to the slippery surface.</li>
	<li>Fix the dynamometer to the manipulator. Connect a cylinder table (diameter: 2 cm) with a force head to act as a soft tissue fixed platform.</li>
	<li>Fix the soft tissue (e.g., chicken breast; length: 5 cm, width: 2 cm, thickness: 3 mm) onto the cylinder table using a thin wire. Ensure that the soft tissue surface is approximately even.</li>
	<li>Load the soft tissue onto the test surface at a speed of 1 mm/s until the dynamometer reaches a certain maximum force (e.g., 4.5 N) by rotating the motion button of the manipulator. Then, unload the soft tissue at the same speed.</li>
	<li>Connect a computer to the dynamometer using a data transmission line and record the real-time force between the soft tissue and the test surface.</li>
</ol>

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The authors have nothing to disclose.

This manuscript details protocols for fabricating a slippery surface with high-temperature resistance. The slippery property of our prepared surface was demonstrated by observing the easy-sliding behavior of a water droplet. Then, the anti-wetting of the prepared slippery surface at different high temperatures was investigated by depositing a water droplet on the hot surface. The results show that the prepared slippery surface maintained its slippery property even when it was heated to above 300 &#176;C. We also determin...

Anti-adhesion surfaces at high temperatures for use with liquids and soft tissues have received considerable interest because of their extensive application potential in electrosurgical instruments, engines, pipelines etc.1,2,3,4. Bioinspired surfaces, particularly superhydrophobic surfaces, are considered the ideal choice because of their excellent anti-wetting abilities and self-cleaning properties5. In superhydrophobic surfaces, the anti-wetting ability should be ascribed to the locked air in the surface structure. However, the superhydrophobic state is unstable because it is in the Cassie-Baxter state6,7. Also, at high temperatures, the anti-wetting for liquid droplets can fail because of the wetting state transition from the Cassie-Baxter to the Wenzel state8. This wetting transition is induced by small liquid droplet wetting in the structures, which results in the failure to lock the air in place.
Recently, inspired by the slippery properties of the peritome of the pitcher plant, Nepenthes, Wong et al. reported a concept to construct slippery surfaces by infusing a lubricant into the surface structures9,10,11. Due to capillary force, the structures can firmly hold the lubricant in place, just as in the locked air pocket on superhydrophobic surfaces. Thus, the lubricant and surface structures can form a stable solid/liquid surface. When the lubricant has a preferential affinity for the surface structure, the liquid droplet on the composite surface can slide easily, with only a very low contact angle hysteresis (e.g., ~2&#176;)12. This lubricant layer also enables the surface to have remarkable anti-wetting capabilities13, demonstrating great potential for medical devices14,15. However, previous studies on slippery surfaces mainly focused on the preparation for application at room temperature or low temperatures. There are very few studies on the preparation of slippery surfaces with high-temperature resistance. For example, Zhang et al. showed that the rapid evaporation of lubricant rapidly causes the failure of the slippery property at even slightly high temperatures16.
Slippery surfaces with high-temperature resistance can widen the application potential; for example, they can be used as liquid barriers to decrease soft tissue adhesion to electrosurgical instrument tips. During the surgical operation, severe soft tissue adhesion occurs because of the high temperature of the electrosurgical instrument tips. The soft tissue can be charred, causing it to adhere to the instrument tip, which then tears the soft tissue around the tip17,18,19. The adhered soft tissue on the electrosurgical instrument tip negatively influences the operation and also may induce the failure of hemostasis19,20. These effects significantly harm people&#39;s health and economic interest. Therefore, solving the issue of soft tissue adhesion to electrosurgical instruments is very urgent. In fact, slippery surfaces offer an opportunity to solve this problem.
Here, we present a protocol to fabricate slippery surfaces available at high temperatures. Stainless steel was selected as the surface material because of its high-temperature resistance. The stainless steel was roughened by photolithography-assisted chemical etching. Then, the surface was functionalized with a biocompatible material, saline octadecyltrichlorosilane (OTS)21,22,23,24. A slippery surface was prepared by adding silicone oil. These materials enabled the slippery surface to achieve high-temperature resistance. The anti-wetting property at high temperatures and the anti-adhesion effects on soft tissue were investigated. The results show the potential of using slippery surfaces to solve the anti-adhesion problem at high temperatures.

<table width="614">
	<tbody>
		<tr height="48" style="height:36.0pt">
			<td class="xl17" height="48" style="width:128pt;height:36.0pt" width="171">Stainless steel</td>
			<td class="xl17" style="width:113pt" width="150">Hongtu Corporation</td>
			<td class="xl20" style="width:95pt" width="126">316</td>
			<td class="xl17" style="width:125pt" width="167">Use as received</td>
		</tr>
		<tr height="47" style="height:35.25pt">
			<td class="xl17" height="47" style="width:128pt;height:35.25pt" width="171">Octadecyltrichlorosilane</td>
			<td class="xl17" style="width:113pt" width="150">Huaxia Reagent</td>
			<td class="xl17" style="width:95pt" width="126">112-04-9</td>
			<td class="xl17" style="width:125pt" width="167">Use as received</td>
		</tr>
		<tr height="91" style="height:68.25pt">
			<td class="xl17" height="91" style="width:128pt;height:68.25pt" width="171">Photoresist</td>
			<td class="xl17" style="width:113pt" width="150">Kempur Microelectronic Corporation</td>
			<td class="xl16">317S</td>
			<td class="xl17" style="width:125pt" width="167">Use as received</td>
		</tr>
		<tr height="55" style="height:41.25pt">
			<td class="xl17" height="55" style="width:128pt;height:41.25pt" width="171">Silicone oil</td>
			<td class="xl17" style="width:113pt" width="150">Beijing Chemical Works</td>
			<td class="xl17" style="width:95pt" width="126">350 cst</td>
			<td class="xl17" style="width:125pt" width="167">Use as received</td>
		</tr>
		<tr height="52" style="height:39.0pt">
			<td class="xl16" height="52" style="height:39.0pt">Anhydrous toluene</td>
			<td class="xl17" style="width:113pt" width="150">Beijing Chemical Works</td>
			<td class="xl17" style="width:95pt" width="126">108-88-3</td>
			<td class="xl17" style="width:125pt" width="167">Use as received</td>
		</tr>
		<tr height="56" style="height:42.0pt">
			<td class="xl17" height="56" style="width:128pt;height:42.0pt" width="171">Phosphoric acid (H3PO4)</td>
			<td class="xl17" style="width:113pt" width="150">Tianjin Chemical Corporation</td>
			<td class="xl17" style="width:95pt" width="126">7664-38-2</td>
			<td class="xl17" style="width:125pt" width="167">Use as received</td>
		</tr>
		<tr height="63" style="height:47.25pt">
			<td class="xl17" height="63" style="width:128pt;height:47.25pt" width="171">Hydrochloric acid (HCl)</td>
			<td class="xl17" style="width:113pt" width="150">Tianjin Chemical Corporation</td>
			<td class="xl16">7647-01-0</td>
			<td class="xl17" style="width:125pt" width="167">Use as received</td>
		</tr>
		<tr height="56" style="height:42.0pt">
			<td class="xl16" height="56" style="height:42.0pt">Ferric chloride (FeCl3)</td>
			<td class="xl17" style="width:113pt" width="150">Tianjin Chemical Corporation</td>
			<td class="xl16">7705-08-0</td>
			<td class="xl17" style="width:125pt" width="167">Use as received</td>
		</tr>
		<tr height="54" style="height:40.5pt">
			<td class="xl17" height="54" style="width:128pt;height:40.5pt" width="171">Optical upright microscope</td>
			<td class="xl16">Olympus</td>
			<td class="xl16">BX51</td>
			<td class="xl16"></td>
		</tr>
		<tr height="46" style="height:34.5pt">
			<td class="xl17" height="46" style="width:128pt;height:34.5pt" width="171">Optical stereo microscope</td>
			<td class="xl16">Olympus</td>
			<td class="xl16">SZX16</td>
			<td class="xl16"></td>
		</tr>
		<tr height="50" style="height:37.5pt">
			<td class="xl16" height="50" style="height:37.5pt">High speed camera</td>
			<td class="xl16">Olympus</td>
			<td class="xl16">i-SPEED LT</td>
			<td class="xl16"></td>
		</tr>
		<tr height="52" style="height:39.0pt">
			<td class="xl17" height="52" style="width:128pt;height:39.0pt" width="171">Ultrasonic cleaner</td>
			<td class="xl19" style="width:113pt" width="150">KUNSHAN ULTRASONIC INSTRUMENTS CO. LTD</td>
			<td class="xl16">KQ-500E</td>
			<td></td>
		</tr>
		<tr height="49" style="height:36.75pt">
			<td class="xl17" height="49" style="width:128pt;height:36.75pt" width="171">Dynamometer</td>
			<td class="xl19" style="width:113pt" width="150">Yueqing Handapi Instruments Co. Ltd</td>
			<td class="xl16">HP-5</td>
			<td></td>
		</tr>
		<tr height="64" style="height:48.0pt">
			<td class="xl17" height="64" style="width:128pt;height:48.0pt" width="171">Manipulator</td>
			<td class="xl17" style="width:113pt" width="150">Yueqing Handapi Instruments Co. Ltd</td>
			<td class="xl16">HLD</td>
			<td></td>
		</tr>
		<tr height="62" style="height:46.5pt">
			<td class="xl17" height="62" style="width:128pt;height:46.5pt" width="171">Hot plate</td>
			<td class="xl17" style="width:113pt" width="150">Shenzhen Jingyihuang Corporation</td>
			<td class="xl16">DRB-1</td>
			<td></td>
		</tr>
	</tbody>
</table>

preparation and high-temperature anti-adhesion behavior of a slippery surface on stainless steel

Anti-adhesion surfaces with high-temperature resistance have a wide application potential in electrosurgical instruments, engines, and pipelines. A typical anti-wetting superhydrophobic surface easily fails when exposed to a high-temperature liquid. Recently, Nepenthes-inspired slippery surfaces demonstrated a new way to solve the adhesion problem. A lubricant layer on the slippery surface can act as a barrier between the repelled materials and the surface structure. However, the slippery surfaces in previous studies rarely showed high-temperature resistance. Here, we describe a protocol for the preparation of slippery surfaces with high-temperature resistance. A photolithography-assisted method was used to fabricate pillar structures on stainless steel. By functionalizing the surface with saline, a slippery surface was prepared by adding silicone oil. The prepared slippery surface maintained the anti-wetting property for water, even when the surface was heated to 300 &#176;C. Also, the slippery surface exhibited great anti-adhesion effects on soft tissues at high temperatures. This type of slippery surface on stainless steel has applications in medical devices, mechanical equipment, etc.

The slippery surface was prepared by adding silicone oil to OTS-coated, chemically etched stainless steel. Due to their similar chemical properties, the surface was completely wetted by silicone oil. The wetting process is shown in Figure 1a. The red dotted line marks the wetting line. After the wetting, a visible oil layer could be distinguished from the dry surface. The slippery property of the prepared slippery surface was investigated by depositing a wate...

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Preparation and High-temperature Anti-adhesion Behavior of a Slippery Surface on Stainless Steel

Slippery surfaces provide a new way to solve the adhesion problem. This protocol describes how to fabricate slippery surfaces at high temperatures. The results demonstrate that the slippery surfaces showed anti-wetting for liquids and a remarkable anti-adhesion effect on soft tissues at high temperatures.

Anti-adhesion surfaces with high-temperature resistance have a wide application potential in electrosurgical instruments, engines, and pipelines. A ...

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7.5K 조회수.  Beihang University. Slippery surfaces provide a new way to solve the adhesion problem. This protocol describes how to fabricate slippery surfaces at high temperatures. The results demonstrate that the slippery surfaces showed anti-wetting for liquids and a remarkable anti-adhesion effect on soft tissues at high temperatures.

비디오: Preparation and High-temperature Anti-adhesion Behavior of a Slippery Surface on Stainless Steel

Mechanical Expansion of Steel Tubing as a Solution to Leaky Wellbores

Wellbore cement, a procedural component of wellbore completion operations, primarily provides zonal isolation and mechanical support of the metal pipe (casing), and protects metal components from corrosive fluids. These are essential for uncompromised wellbore integrity. Cements can undergo multiple forms of failure, such as debonding at the cement/rock and cement/metal interfaces, fracturing, and defects within the cement matrix. Failures and defects within the cement will ultimately lead to fluid migration, resulting in inter-zonal fluid migration and premature well abandonment. Currently, there are over 1.8 million operating wells worldwide and over one third of these wells have leak related problems defined as Sustained Casing Pressure (SCP)1. 
The focus of this research was to develop an experimental setup at bench-scale to explore the effect of mechanical manipulation of wellbore casing-cement composite samples as a potential technology for the remediation of gas leaks. 
The experimental methodology utilized in this study enabled formation of an impermeable seal at the pipe/cement interface in a simulated wellbore system. Successful nitrogen gas flow-through measurements demonstrated that an existing microannulus was sealed at laboratory experimental conditions and fluid flow prevented by mechanical manipulation of the metal/cement composite sample. Furthermore, this methodology can be applied not only for the remediation of leaky wellbores, but also in plugging and abandonment procedures as well as wellbore completions technology, and potentially preventing negative impacts of wellbores on subsurface and surface environments.

This article reports on a laboratory scale investigation of an existing field procedure and its adaptation for sealing of leaky wellbores. It consists of mechanical expansion of metal pipe, which results in an improved metal/cement bond, ultimate sealing of hydraulic pathways and prevention of gas leaks caused by the presence of a microannular channel.

Wellbore cement, a procedural component of wellbore completion operations, primarily provides zonal isolation and mechanical support of the metal pipe ...

연구

공학

Visualization of High Speed Liquid Jet Impaction on a Moving Surface

Two apparatuses for examining liquid jet impingement on a high-speed moving surface are described: an air cannon device (for examining surface speeds between 0 and 25 m/sec) and a spinning disk device (for examining surface speeds between 15 and 100 m/sec). The air cannon linear traverse is a pneumatic energy-powered system that is designed to accelerate a metal rail surface mounted on top of a wooden projectile. A pressurized cylinder fitted with a solenoid valve rapidly releases pressurized air into the barrel, forcing the projectile down the cannon barrel. The projectile travels beneath a spray nozzle, which impinges a liquid jet onto its metal upper surface, and the projectile then hits a stopping mechanism. A camera records the jet impingement, and a pressure transducer records the spray nozzle backpressure. The spinning disk set-up consists of a steel disk that reaches speeds of 500 to 3,000 rpm via a variable frequency drive (VFD) motor. A spray system similar to that of the air cannon generates a liquid jet that impinges onto the spinning disc, and cameras placed at several optical access points record the jet impingement. Video recordings of jet impingement processes are recorded and examined to determine whether the outcome of impingement is splash, splatter, or deposition. The apparatuses are the first that involve the high speed impingement of low-Reynolds-number liquid jets on high speed moving surfaces. In addition to its rail industry applications, the described technique may be used for technical and industrial purposes such as steelmaking and may be relevant to high-speed 3D printing.

Two experimental devices for examining liquid jet impingement on a high-speed moving surface are described: an air cannon device and a spinning disk device. The apparatuses are used to determine optimal approaches to the application of liquid friction modifier (LFM) onto rail tracks for top-of-rail friction control.

Two apparatuses for examining liquid jet impingement on a high-speed moving surface are described: an air cannon device (for examining surface speeds ...

Emission Spectroscopic Boundary Layer Investigation during Ablative Material Testing in Plasmatron

Ablative Thermal Protection Systems (TPS) allowed the first humans to safely return to Earth from the moon and are still considered as the only solution for future high-speed reentry missions. But despite the advancements made since Apollo, heat flux prediction remains an imperfect science and engineers resort to safety factors to determine the TPS thickness. This goes at the expense of embarked payload, hampering, for example, sample return missions. 
Ground testing in plasma wind-tunnels is currently the only affordable possibility for both material qualification and validation of material response codes. The subsonic 1.2MW Inductively Coupled Plasmatron facility at the von Karman Institute for Fluid Dynamics is able to reproduce a wide range of reentry environments. This protocol describes a procedure for the study of the gas/surface interaction on ablative materials in high enthalpy flows and presents sample results of a non-pyrolyzing, ablating carbon fiber precursor. With this publication, the authors envisage the definition of a standard procedure, facilitating comparison with other laboratories and contributing to ongoing efforts to improve heat shield reliability and reduce design uncertainties.
The described core techniques are non-intrusive methods to track the material recession with a high-speed camera along with the chemistry in the reactive boundary layer, probed by emission spectroscopy. Although optical emission spectroscopy is limited to line-of-sight measurements and is further constrained to electronically excited atoms and molecules, its simplicity and broad applicability still make it the technique of choice for analysis of the reactive boundary layer. Recession of the ablating sample further requires that the distance of the measurement location with respect to the surface is known at all times during the experiment. Calibration of the optical system of the applied three spectrometers allowed quantitative comparison. At the fiber scale, results from a post-test microscopy analysis are presented.

Development of new ablative materials and their numerical modeling requires extensive experimental investigation. This protocol describes procedures for material response characterization in plasma flows with the core techniques being non-intrusive methods to track the material recession along with the chemistry in the reactive boundary layer by emission spectroscopy.

Plasmatron에서 절제 재료 시험 중에 방출 분광 경계 계층 조사

Ablative Thermal Protection Systems (TPS) allowed the first humans to safely return to Earth from the moon and are still considered as the only solution ...

The Evolution of Silica Nanoparticle-polyester Coatings on Surfaces Exposed to Sunlight

Corrosion of metallic surfaces is prevalent in the environment and is of great concern in many areas, including the military, transport, aviation, building and food industries, amongst others. Polyester and coatings containing both polyester and silica nanoparticles (SiO2NPs) have been widely used to protect steel substrata from corrosion. In this study, we utilized X-ray photoelectron spectroscopy, attenuated total reflection infrared micro-spectroscopy, water contact angle measurements, optical profiling and atomic force microscopy to provide an insight into how exposure to sunlight can cause changes in the micro- and nanoscale integrity of the coatings. No significant change in surface micro-topography was detected using optical profilometry, however, statistically significant nanoscale changes to the surface were detected using atomic force microscopy. Analysis of the X-ray photoelectron spectroscopy and attenuated total reflection infrared micro-spectroscopy data revealed that degradation of the ester groups had occurred through exposure to ultraviolet light to form COO&#903;, -H2C&#903;, -O&#903;, -CO&#903; radicals. During the degradation process, CO and CO2 were also produced.

Two types of surfaces, polyester-coated steel and polyester coated with a layer of silica nanoparticles, were studied. Both surfaces were exposed to sunlight, which was found to cause substantial changes in the chemistry and nanoscale topography of the surface.

햇빛에 노출 된 표면에 실리카 나노 입자 - 폴리 에스테르 코팅의 진화

Corrosion of metallic surfaces is prevalent in the environment and is of great concern in many areas, including the military, transport, aviation, ...

Applying X-ray Imaging Crystal Spectroscopy for Use as a High Temperature Plasma Diagnostic

X-ray spectra provide a wealth of information on high temperature plasmas; for example electron temperature and density can be inferred from line intensity ratios. By using a Johann spectrometer viewing the plasma, it is possible to construct profiles of plasma parameters such as density, temperature, and velocity with good spatial and time resolution. However, benchmarking atomic code modeling of X-ray spectra obtained from well-diagnosed laboratory plasmas is important to justify use of such spectra to determine plasma parameters when other independent diagnostics are not available. This manuscript presents the operation of the High Resolution X-ray Crystal Imaging Spectrometer with Spatial Resolution (HIREXSR), a high wavelength resolution spatially imaging X-ray spectrometer used to view hydrogen- and helium-like ions of medium atomic number elements in a tokamak plasma. In addition, this manuscript covers a laser blow-off system that can introduce such ions to the plasma with precise timing to allow for perturbative studies of transport in the plasma.

X-ray spectra provide a wealth of information on high temperature plasmas. This manuscript presents the operation of a high wavelength resolution spatially imaging X-ray spectrometer used to view hydrogen- and helium-like ions of medium atomic number elements in a tokamak plasma.

하이 온도 플라즈마 진단으로 사용하기 위해 X 선 영상 크리스탈 분광학 적용

X-ray spectra provide a wealth of information on high temperature plasmas; for example electron temperature and density can be inferred from line ...

Adsorption Device Based on a Langatate Crystal Microbalance for High Temperature High Pressure Gas Adsorption in Zeolite H-ZSM-5

We present a high-temperature and high-pressure gas adsorption measurement device based on a high-frequency oscillating microbalance (5 MHz langatate crystal microbalance, LCM) and its use for gas adsorption measurements in zeolite H-ZSM-5. Prior to the adsorption measurements, zeolite H-ZSM-5 crystals were synthesized on the gold electrode in the center of the LCM, without covering the connection points of the gold electrodes to the oscillator, by the steam-assisted crystallization (SAC) method, so that the zeolite crystals remain attached to the oscillating microbalance while keeping good electroconductivity of the LCM during the adsorption measurements. Compared to a conventional quartz crystal microbalance (QCM) which is limited to temperatures below 80 &#176;C, the LCM can realize the adsorption measurements in principle at temperatures as high as 200-300 &#176;C (i.e., at or close to the reaction temperature of the target application of one-stage DME synthesis from the synthesis gas), owing to the absence of crystalline-phase transitions up to its melting point (1,470 &#176;C). The system was applied to investigate the adsorption of CO2, H2O, methanol and dimethyl ether (DME), each in the gas phase, on zeolite H-ZSM-5 in the temperature and pressure range of 50-150 &#176;C and 0-18 bar, respectively. The results showed that the adsorption isotherms of these gases in H-ZSM-5 can be well fitted by Langmuir-type adsorption isotherms. Furthermore, the determined adsorption parameters, i.e., adsorption capacities, adsorption enthalpies, and adsorption entropies, compare well to literature data. In this work, the results for CO2 are shown as an example.

A protocol for high-temperature and high-pressure gas adsorption measurements on zeolite H-ZSM-5 using an adsorption measurement device based on a langatate crystal microbalance is presented. Prior to the adsorption measurements, the synthesis of zeolite H-ZSM-5 on the langatate crystal microbalance sensor by the steam-assisted crystallization (SAC) method is demonstrated.

제올라이트 고온 고압의 가스 흡착 용 Langatate 크리스탈 마이크로 밸런스 기준 흡착 기기 H-ZSM-5

We present a high-temperature and high-pressure gas adsorption measurement device based on a high-frequency oscillating microbalance (5 MHz langatate ...

High Temperature Fabrication of Nanostructured Yttria-Stabilized-Zirconia (YSZ) Scaffolds by In Situ Carbon Templating Xerogels

We demonstrate a method for the high temperature fabrication of porous, nanostructured yttria-stabilized-zirconia (YSZ, 8 mol% yttria - 92 mol% zirconia) scaffolds with tunable specific surface areas up to 80 m2&#183;g-1. An aqueous solution of a zirconium salt, yttrium salt, and glucose is mixed with propylene oxide (PO) to form a gel. The gel is dried under ambient conditions to form a xerogel. The xerogel is pressed into pellets and then sintered in an argon atmosphere. During sintering, a YSZ ceramic phase forms and the organic components decompose, leaving behind amorphous carbon. The carbon formed in situ serves as a hard template, preserving a high surface area YSZ nanomorphology at sintering temperature. The carbon is subsequently removed by oxidation in air at low temperature, resulting in a porous, nanostructured YSZ scaffold. The concentration of the carbon template and the final scaffold surface area can be systematically tuned by varying the glucose concentration in the gel synthesis. The carbon template concentration was quantified using thermogravimetric analysis (TGA), the surface area and pore size distribution was determined by physical adsorption measurements, and the morphology was characterized using scanning electron microscopy (SEM). Phase purity and crystallite size was determined using X-ray diffraction (XRD). This fabrication approach provides a novel, flexible platform for realizing unprecedented scaffold surface areas and nanomorphologies for ceramic-based electrochemical energy conversion applications, e.g. solid oxide fuel cell (SOFC) electrodes.

High Temperature Fabrication of Nanostructured Yttria-Stabilized-Zirconia YSZ Scaffolds by In Situ Carbon Templating Xerogels

A protocol for fabricating porous, nanostructured yttria-stabilized-zirconia (YSZ) scaffolds at temperatures between 1,000 &#176;C and 1,400 &#176;C is presented.

에 의한 나노 구조 산화 이트륨 안정화 지르코니아 (YSZ) 비계의 고온 제작<em&gt; 시츄</em&gt; 탄소 템플릿 생성 크 세로 겔

We demonstrate a method for the high temperature fabrication of porous, nanostructured yttria-stabilized-zirconia (YSZ, 8 mol% yttria - 92 mol% zirconia) ...

Preparation of Aligned Steel Fiber Reinforced Cementitious Composite and Its Flexural Behavior

The aim of this work is to present an approach, inspired by the way in which a compass needle maintains a consistent orientation under the action of the Earth&#39;s magnetic field, for manufacturing a cementitious composite reinforced with aligned steel fibers. Aligned steel fiber reinforced cementitious composites (ASFRC) were prepared by applying a uniform electromagnetic field to fresh mortar containing short steel fibers, whereby the short steel fibers were driven to rotate in alignment with the magnetic field. The degree of alignment of steel fibers in hardened ASFRC was assessed both by counting steel fibers in fractured cross-sections and by X-ray computed tomography analysis. The results from the two methods show that the steel fibers in ASFRC were highly aligned while the steel fibers in non-magnetically treated composites were randomly distributed. The aligned steel fibers had a much higher reinforcing efficiency, and the composites, therefore, exhibited significantly enhanced flexural strength and toughness. The ASFRC is thus superior to SFRC in that it can withstand greater tensile stress and more effectively resist cracking.

This protocol describes an approach for manufacturing aligned steel fiber reinforced cementitious composite by applying a uniform electromagnetic field. Aligned steel fiber reinforced cementitious composite exhibits superior mechanical properties to ordinary fiber reinforced concrete.

The aim of this work is to present an approach, inspired by the way in which a compass needle maintains a consistent orientation under the action of the ...

Radio Frequency Magnetron Sputtering of GdBa2Cu3O7&#8722;&#948;/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates

Here, we demonstrate a method of coating ferromagnetic La0.67Sr0.33MnO3 (LSMO) nanoparticles on (001) SrTiO3 (STO) single-crystal substrates by radio frequency (RF) magnetron sputtering. LSMO nanoparticles were deposited with diameters from 10 to 20 nm and heights between 20 and 50 nm. At the same time, (Gd) Ba2Cu3O7&#8722;&#948; ((Gd) BCO) films were fabricated on both undecorated and LSMO nanoparticle decorated STO substrates using RF magnetron sputtering. This report also describes the properties of GdBa2Cu3O7&#8722;&#948;/ La0.67Sr0.33MnO3 quasi-bilayer films structures (e.g., crystalline phase, morphology, chemical composition); magnetization, magneto-transport, and superconducting transport properties were also evaluated.

Radio Frequency Magnetron Sputtering of GdBa2Cu3O7ÃƒÆ’Ã‚Â¢Ãƒâ€¹Ã¢â‚¬Â 'ÃƒÆ’Ã…Â½ Â´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates

Here, we present a protocol to grow LSMO nanoparticles and (Gd) BCO films on (001) SrTiO3 (STO) single-crystal substrates by radio frequency (RF)-sputtering.

고주파 마 그 네트 론 스퍼터 링 GdBa2Cu3O7−δ의 라0.67SrTiO3 (STO) 단 결정 기판에 Sr0.33MnO3 준 bilayer 영화 /

Here, we demonstrate a method of coating ferromagnetic La0.67Sr0.33MnO3 (LSMO) nanoparticles on (001) SrTiO3 (STO) single-crystal substrates by radio ...

Generating Lap Joints Via Friction Stir Spot Welding on DP780 Steel

Friction stir spot welding (FSSW), a derivative of friction stir welding (FSW), is a solid-state welding technique that was developed in 1991. An industry application was found in the automotive industry in 2003 for the aluminum alloy that was used in the rear doors of automobiles. Friction stir spot welding is mostly used in Al alloys to create lap joints. The benefits of friction stir spot welding include a nearly 80% melting temperature that lowers the thermal deformation welds without splashing compared to resistance spot welding. Friction stir spot welding includes 3 steps: plunging, stirring, and retraction. In the present study, other materials including high strength steel are also used in the friction stir welding method to create joints. DP780, whose traditional welding process involves the use of resistance spot welding, is one of several high strength steel materials used in the automotive industry. In this paper, DP780 was used for friction stir spot welding, and its microstructure and microhardness were measured. The microstructure data showed that there was a fusion zone with fine grain and a heat effect zone with island martensite. The microhardness results indicated that the center zone exhibited a greater degree of hardness compared with the base metal. All data indicated that the friction stir spot welding used in dual phase steel 780 can create a good lap joint. In the future, friction stir spot welding can be used in high-strength steel welding applied in industrial manufacturing processes.

Here, we present a friction stir spot welding (FSSW) protocol on dual phase 780 steel. A tool pin with high-speed rotation generates heat from friction to soften the material, and then, the pin plunges into 2 sheet joints to create the lap joint.

DP780 강철의 마찰 교반 점 용접을 통해 랩 조인트 생성

Friction stir spot welding (FSSW), a derivative of friction stir welding (FSW), is a solid-state welding technique that was developed in 1991. An industry ...