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.

1. Steel Samples
<ol>
	<li>Obtain steel samples of 1 mm thickness from a commercial supplier. 
	NOTE: Samples were coated with either polyester or polyester coated with silica nanoparticles.</li>
	<li>Expose samples to sunlight at Rockhampton, Queensland, Australia: collect samples after one-year and five-year intervals over a total 5-year period. Cut sample panels into round discs of 1 cm diameter using hole puncher.</li>
	<li>Prior to surface characterization, rinse samples with double-distilled...

<ol>
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Polyester coatings have been widely used to protect steel substrata from the corrosion that would occur on an uncoated surface due to the accumulation of moisture and pollutants. The application of polyester coatings can protect the steel from corrosion; however the longer-term effectiveness of these coatings is compromised if they are exposed to high levels of ultraviolet light under humid conditions, as occurs in tropical climates. Silica nanoparticles can be applied to the surface of the polyester to improve the robus...

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

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.

The coated steel samples that had been subjected to exposure to the sunlight for either one or five years were collected, and water contact angle measurements were carried out to determine whether the exposure had resulted in a change in the surface hydrophobicity of the surface (Figure 2).
<img alt="Figure 2" src="/files/ftp_upload/54309/54309fig2.jpg" /> 
Figure 2. Wettability variation of surfaces with polyester or silica nanopa...

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

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.

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

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