Name: the evolution of silica nanoparticle-polyester coatings on surfaces exposed to sunlight
Uploaded: 2016-10-11T14:00:00
Description: Watch this Scientific Journal Video about The Evolution of Silica Nanoparticle-polyester Coatings on Surfaces Exposed to Sunlight at JoVE.com

Funding from the Australian Research Council Industrial Transformation Research Hubs Scheme (Project Number IH130100017) is gratefully acknowledged. Authors gratefully acknowledge the RMIT Microscopy and Microanalysis Facility (RMMF) for providing access to the characterisation instruments. This research was also undertaken on the Infrared Microscopectroscopy beamline at the Australian Synchrotron, Victoria, Australia.

<html> 1. דוגמאות פלדה <ol style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> להשיג דגימות פלדה בעובי 1 מ&quot;מ מן הספק מסחרי. הערה: דוגמאות היו מצופות או פוליאסטר או פוליאסטר מצופה חלקיקי סיליקה. </li><li style=";text-align:right;direction:rtl"> לחשוף דגימות לאור השמש ב Rockhampton, קווינסלנד,...

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ציפוי פוליאסטר היה בשימוש נרחב כדי להגן לקרקע פלדה מן קורוזיה זה יתרחש על פני השטח ללא ציפוי בשל הצטברות של לחות ומזהמים. היישום של ציפוי פוליאסטר יכול להגן על הפלדה מפני קורוזיה; אולם היעילות לטווח ארוך של ציפויים אלו נפגעת אם הם נחשפים לרמות גבוהות של אור אולטרה סגו...

Environmental corrosion of metals in the environment is both prevalent and costly1-3. A recent study conducted by the Australasian Corrosion Association (ACA) reported that corrosion of metals resulted in a yearly cost of $982 million, which was directly associated with the degradation of assets and infrastructure through metallic corrosion within the water industry4. From an international perspective, the World Corrosion Organization estimated that metallic corrosion was responsible for a direct cost of $3.3 trillion, over 3% of the world's GDP5. The process of galvanizing as a corrosion preventative method has been widely used to increase the lifespan of steel material6. In humid and subtropical climates, however, water tends to condense into small pockets or grooves within the surface of the galvanized steel, leading to the acceleration of corrosion rates through pit corrosion7,8. Thermosetting polymer coatings based on polyesters have been developed to coat the galvanized steel substrata increasing their ability to withstand humid weathering conditions for items such as satellite dishes, garden furniture, air-conditioning units or agricultural construction equipment9-11. Unfortunately polymer coatings on steel surfaces have been found to be considerably adversely affected by the presence of high levels of ultraviolet (uv) radiation12-14. Coatings comprised of silica nanoparticles (SiO2) spread over a polymer layer have been widely used with a view to increasing their corrosion-, wear-, tear- and degradation-resistance15,16. The tendency of the protective polymeric coatings to form pores and cracks can be reduced by incorporating nanoparticles (NPs), which contribute to the passive obstruction of corrosion initiation17,18. Also, the mechanical stability of the protective polymeric layer can be improved by NPs inclusion. However, these coatings act as passive physical barriers and, in comparison to the galvanization approach, cannot inhibit corrosion propagation actively.
An in-depth understanding of the effect that high-levels of ultraviolet light exposure under humid conditions upon these metal coatings is yet to be obtained. In this paper, a wide range of surface analytical techniques, including X-ray photoelectron spectroscopy (XPS), attenuated total reflection infrared micro-spectroscopy (ATR IR), contact angle goniometry, optical profiling and atomic force microscopy (AFM) will be employed to examine the changes in the surface of steel coatings prepared from polyester- and silica nanoparticle-coated polyester (silica nanoparticles/polyester) after exposure to sunlight. Furthermore, the aim of this work is to give a concise, practical overview of the overall characterization techniques to examine weathered samples.

<table border="0" cellpadding="0" cellspacing="0" width="1044">
	<colgroup>
		<col />
		<col />
		<col />
		<col />
	</colgroup>
	<tbody>
		<tr height="41">
			<td height="41" style="height:41px;width:263px;">polyester-coated steel 
			silica nanoparticle-polyester coated steel substrata</td>
			<td style="width:231px;">BlueScope Steel</td>
			<td style="width:163px;"></td>
			<td style="width:387px;">Samples provided by company</td>
		</tr>
		<tr height="26">
			<td height="26" style="height:26px;width:263px;">Millipore PetriSlideTM&#160;</td>
			<td style="width:231px;">Fisher Scientific</td>
			<td style="width:163px;">PDMA04700</td>
			<td>Storing samples</td>
		</tr>
		<tr height="49">
			<td height="49" style="height:49px;width:263px;">Thermo ScientificTM K-alpha 
			X-ray Photoelectron Spectrometer</td>
			<td>Thermo Fisher Scientific, Inc.</td>
			<td>IQLAADGAAFFACVMAHV</td>
			<td>Acquire XPS spectra</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:263px;">Avantage Data System</td>
			<td>Thermo Fisher Scientific, Inc.</td>
			<td>IQLAADGACKFAKRMAVI</td>
			<td>Analyse XPS spectra</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">A Bruker Hyperion 2000 microscope&#160;</td>
			<td style="width:231px;">Bruker Corporation</td>
			<td style="width:163px;"></td>
			<td>Synchrotron integrated instrument</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Bruker Opus v. 7.2</td>
			<td style="width:231px;">Bruker Corporation</td>
			<td style="width:163px;"></td>
			<td>ATR-IR analysis software</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:263px;">Contact angle goniometer, FTA1000c</td>
			<td>First Ten &#197;ngstroms Inc., VA, USA</td>
			<td style="width:163px;"></td>
			<td>Measuring the wettability of surfaces</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:263px;">FTA v. 2.0</td>
			<td>First Ten &#197;ngstroms Inc., VA, USA</td>
			<td style="width:163px;"></td>
			<td>Anaylyzing water contact angle</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Optical profiler, Wyko NT1100&#160;</td>
			<td>Bruker Corporation</td>
			<td style="width:163px;"></td>
			<td>Measure surface topography</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Innova atomic force microscope&#160;</td>
			<td>Bruker Corporation</td>
			<td style="width:163px;"></td>
			<td>Measure surface topography</td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:263px;">Phosphorus doped silicon probes, MPP-31120-10</td>
			<td>Bruker Corporation</td>
			<td style="width:163px;"></td>
			<td>AFM probes</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Gwyddion software</td>
			<td style="width:231px;">http://gwyddion.net/</td>
			<td style="width:163px;"></td>
			<td>Software used to measure optical profiling and AFM data</td>
		</tr>
	</tbody>
</table>

the evolution of silica nanoparticle-polyester coatings on surfaces exposed to sunlight

קורוזיה על מתכת נפוצה בסביבה והוא מקור לדאגה רבה בתחומים רבים, כולל צבא, תחבורה, תעופה, ענפי בניין מזון, בין יתר. פוליאסטר וציפויים המכילים גם פוליאסטר חלקיקי סיליקה (SiO 2 NPS) היו בשימוש נרחב כדי להגן לקרקע פלדה מפני קורוזיה. במחקר זה, השתמשנו רנטגן ספקטרוסקופיה photoelectron, אינפרא אדום הכולל השתקפות נחלש מיקרו-ספקטרוסקופיה, מדידות זווית המגע במים, פרופיל אופטי מיקרוסקופ כוח אטומי כדי לספק תובנות לגבי האופן שבו חשיפה לאור השמש יכול לגרום לשינויים מיקרו ויושרה ננומטריים של ציפויים. לא חל שינוי משמעותי ב-טופוגרפית מייקרו משטח זוהה באמצעות profilometry האופטי, לעומת זאת, שינויי ננו מובהקים סטטיסטי על פני השטח התגלו באמצעות מיקרוסקופ כוח אטומי. ניתוח של ספקטרוסקופיה photoelectron רנטגן והשתקפות הכולל נחלש מיקרו אינפרא אדוםנתוני ספקטרוסקופיה גילו כי השפלה של קבוצות אסתר התרחשה באמצעות חשיפה לאור אולטרה סגול כדי ליצור COO ·, -H 2 C ·, -O ·, -CO · רדיקלים. במהלך התהליך השפל, CO ו- CO 2 הופקו גם.

<html> דגימות הפלדה צופה כי היה נתון חשיפה לאור השמש במשך שנים אחד או חמש נאספו, ומדידות זווית מגע מים בוצעו על מנת לקבוע אם החשיפה ביאה לשינוי הידרופוביות השטח של המשטח (איור 2 ). <img alt="איור 2" src="/files/ftp_upload/54309/5...

Watch this Scientific Journal Video about The Evolution of Silica Nanoparticle-polyester Coatings on Surfaces Exposed to Sunlight at JoVE.com

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

שני סוגי המשטחים, פלדה מצופה פוליאסטר פוליאסטר מצופה בשכבת חלקיקי סיליקה, נחקרו. שני המשטחים נחשפו לאור שמש, אשר נמצא לגרום לשינויים מהותיים טופוגרפית הכימיה ננומטריים של פני השטח.

האבולוציה של ציפויי-פוליאסטר Nanoparticle סיליקה על משטחים חשופים לאור השמש

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Whispering gallery resonant cavities confine light in circular orbits at their periphery.1-2 The photon storage lifetime in the cavity, quantified by the ...

Probing and Mapping Electrode Surfaces in Solid Oxide Fuel Cells

חיטוט ומיפוי משטחי אלקטרודה דלק תאי תחמוצת מוצקות

Solid oxide fuel cells (SOFCs) are potentially the most efficient and cost-effective solution to utilization of a wide variety of fuels beyond hydrogen ...

Fabrication of Nano-engineered Transparent Conducting Oxides by Pulsed Laser Deposition

ייצור של ננו מהונדס תחמוצות שקופות לנהל בתצהיר ליזר פעם

Nanosecond Pulsed  Laser Deposition (PLD) in the presence of a background gas allows the deposition  of metal oxides with tunable morphology, structure, ...

High-speed Particle Image Velocimetry Near Surfaces

Velocimetry תמונת חלקיקים במהירות גבוהה ליד משטחים

Multi-dimensional and transient flows play a key role in many areas of science, engineering, and health sciences but are often not well understood. The ...

Monolayer Contact Doping of Silicon Surfaces and Nanowires Using Organophosphorus Compounds

חד שכבתי לתקשר סימום של משטחי סיליקון וNanowires שימוש בתרכובות זרחן אורגניות

Monolayer Contact Doping (MLCD) is a simple method for doping of surfaces and nanostructures1. MLCD results in the formation of highly controlled, ultra ...

High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings

ציפוי מיקרו-הדמיה תרמית ברזולוציה גבוהה באמצעות אירופיום Chelate פלורסנט

Micro-electronic devices often undergo significant self-heating when biased to their typical operating conditions. This paper describes a convenient ...

Evanescent Field Based Photoacoustics: Optical Property Evaluation at Surfaces

חלוף שדה בהתבסס Photoacoustics: הערכת נכס אופטית על משטחים

Here, we present a protocol to estimate material and surface optical properties using the photoacoustic effect combined with total internal reflection. ...

Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns

ברכת רותחים חום-העברת שיפור על גלילי משטחים עם דפוסי רטיבים היברידיים

In this study, pool-boiling heat-transfer experiments were performed to investigate the effect of the number of interlines and the orientation of the ...

Fabrication of Superhydrophobic Metal Surfaces for Anti-Icing Applications

ייצור של משטחי מתכת Superhydrophobic עבור יישומים ציפוי אנטי

Several ways to produce superhydrophobic metal surfaces are presented in this work. Aluminum was chosen as the metal substrate due to its wide use in ...