The Experts below are selected from a list of 57900 Experts worldwide ranked by ideXlab platform
Frédéric Guittard - One of the best experts on this subject based on the ideXlab platform.
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Robust superhydrophobicity by candle soot deposition on plasma-treated PETG
Surface Innovations, 2015Co-Authors: Hernando S. Salapare, Frédéric GuittardAbstract:Surface Etching was achieved by exposing poly(ethylene glycol-co-1,3/1,4 cyclohexanedimethanol terephthalate) (PETG) samples to oxygen plasma produced in reactive-ion Etching configuration of a radiofrequency plasma device. The Surface modifications on the sample Surfaces were determined by employing water contact angle measurements and profilometry. Enhanced wettability was observed for the plasma-treated samples together with a general increase in the Surface roughness for the plasma-treated samples as compared to the control samples due to Surface Etching. Superhydrophobic candle soot coatings with a maximum water contact angle of 164° were deposited on the control and plasma-treated samples. Durability tests such as water and ethanol immersions were performed on the samples with the results demonstrating that samples with higher Surface roughness values exhibited better candle soot coating adhesion to the PETG samples.
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Robust superhydrophobicity by candle soot deposition on plasma-treated PETG
Surface Innovations, 2015Co-Authors: Hernando S. Salapare, Frédéric GuittardAbstract:Surface Etching was achieved by exposing poly(ethylene glycol-co-1,3/1,4 cyclohexanedimethanol terephthalate) (PETG) samples to oxygen plasma produced in reactive ion Etching configuration of an RF plasma device. The Surface modifications on the sample Surfaces were determined by employing water contact angle measurements and profilometry. Enhanced wettability was observed for the plasma treated samples together with a general increase in the Surface roughness for the plasma treated samples as compared to the control samples due to Surface Etching. Superhydrophobic candle soot coatings with a maximum water contact angle of 164° were deposited on the control and plasma-treated samples. Durability tests such as water and ethanol immersions were performed on the samples with the results demonstrating that samples with higher Surface roughness values exhibited better candle soot coating adhesion to the PETG samples.
Kenjiro Oura - One of the best experts on this subject based on the ideXlab platform.
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In situ observation of oxygen-induced anisotropic Surface Etching processes at 6H-SiC(0 0 0 1) by variable temperature scanning tunneling microscope
Applied Surface Science, 2003Co-Authors: H. Okado, Osamu Kubo, Nobumitsu Yamaoka, S. Itou, Mitsuhiro Katayama, Kenjiro OuraAbstract:Abstract The initial reaction of the 6H-SiC(0 0 0 1) 3 × 3 Surface with O2 molecules at 500 °C has been in situ observed using a variable temperature scanning tunneling microscope (STM). When the Surface was exposed to O2 molecules, many bright spike noises were observed. These noises can be attributed to the O2 molecules rapidly migrating on the Surface. With an increase in O2 exposure, dark lines (L) were formed on the Surface. L was elongated toward 〈1 1 00〉 directions, which manifests anisotropic Surface Etching induced by O2 molecules. No specific site was observed for the starting point of the formation of L. The anisotropic Etching process had a tendency of additional L formation at the vicinity of the former L. The process at which L formed a triangular domain was observed in real time. On this basis, the formation mechanism of the domain is discussed.
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Real-Time Scanning Tunneling Microscope Observations of High-Temperature Oxygen Reaction with the 6H-SiC(0001)√3×√3 Surface
Japanese Journal of Applied Physics, 2003Co-Authors: H. Okado, Osamu Kubo, Nobumitsu Yamaoka, S. Itou, Mitsuhiro Katayama, A. Nishida, Kenjiro OuraAbstract:The initial reaction of the 6H-SiC(0001)√3×√3 Surface with O2 molecules at 500°C has been observed in real time using a variable temperature scanning tunneling microscope. When the Surface was exposed to O2 molecules, many bright spike noises were observed, which can be attributed to migrating O2 molecules. With an increase in O2 exposure, dark lines were formed on the Surface. These dark lines indicate anisotropic Surface Etching. The dark lines had a tendency to be formed in parallel in the vicinity of previously formed dark lines. It was observed that some parallel dark lines rearranged to form a triangular domain. These results revealed that the products formed by Surface Etching dynamically rearranged through the movement of Si adatoms.
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Anisotropic Surface Etching of 6H–SiC(0001) induced by reaction with oxygen molecules
Applied Physics Letters, 2002Co-Authors: Osamu Kubo, Tatsuya Kobayashi, Nobumitsu Yamaoka, S. Itou, Mitsuhiro Katayama, Kenjiro Oura, H. OhkadoAbstract:The initial reactions of the 6H–SiC(0001)∛×∛ Surface with O2 molecules at elevated temperatures have been investigated by scanning tunneling microscopy. As a result, two types of anisotropic features were observed. One was a dark parallelogram with ∛×∛ periodic protrusions elongated in the 〈1100〉 direction, which was observed only in the case of O2 exposure at 700 °C. The other was a dark line in the 〈1100〉 direction, which was observed with O2 exposure at temperatures above 500 °C. Both features manifest anisotropic Surface Etching induced by O2 molecules.
Hernando S. Salapare - One of the best experts on this subject based on the ideXlab platform.
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Robust superhydrophobicity by candle soot deposition on plasma-treated PETG
Surface Innovations, 2015Co-Authors: Hernando S. Salapare, Frédéric GuittardAbstract:Surface Etching was achieved by exposing poly(ethylene glycol-co-1,3/1,4 cyclohexanedimethanol terephthalate) (PETG) samples to oxygen plasma produced in reactive-ion Etching configuration of a radiofrequency plasma device. The Surface modifications on the sample Surfaces were determined by employing water contact angle measurements and profilometry. Enhanced wettability was observed for the plasma-treated samples together with a general increase in the Surface roughness for the plasma-treated samples as compared to the control samples due to Surface Etching. Superhydrophobic candle soot coatings with a maximum water contact angle of 164° were deposited on the control and plasma-treated samples. Durability tests such as water and ethanol immersions were performed on the samples with the results demonstrating that samples with higher Surface roughness values exhibited better candle soot coating adhesion to the PETG samples.
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Robust superhydrophobicity by candle soot deposition on plasma-treated PETG
Surface Innovations, 2015Co-Authors: Hernando S. Salapare, Frédéric GuittardAbstract:Surface Etching was achieved by exposing poly(ethylene glycol-co-1,3/1,4 cyclohexanedimethanol terephthalate) (PETG) samples to oxygen plasma produced in reactive ion Etching configuration of an RF plasma device. The Surface modifications on the sample Surfaces were determined by employing water contact angle measurements and profilometry. Enhanced wettability was observed for the plasma treated samples together with a general increase in the Surface roughness for the plasma treated samples as compared to the control samples due to Surface Etching. Superhydrophobic candle soot coatings with a maximum water contact angle of 164° were deposited on the control and plasma-treated samples. Durability tests such as water and ethanol immersions were performed on the samples with the results demonstrating that samples with higher Surface roughness values exhibited better candle soot coating adhesion to the PETG samples.
Zenglin Wang - One of the best experts on this subject based on the ideXlab platform.
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Improvement in the Etching performance of the acrylonitrile-butadiene-styrene resin by MnO2-H3PO4-H2SO4 colloid.
Langmuir, 2013Co-Authors: Wenxia Zhao, Jie Ding, Zenglin WangAbstract:The present study aimed to evaluate the Surface Etching of the acrylonitrile–butadiene–styrene (ABS) resin in the MnO2–H3PO4–H2SO4 colloid. To enhance the soluble Mn(IV) ion concentration and impro...
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A New Surface Etching Method Using MnO2/H2SO4 Colloid for Adhesion Improvement of Epoxy Polymer
Journal of Adhesion Science and Technology, 2012Co-Authors: Xueli Yuan, Zenglin WangAbstract:Abstract A new Surface Etching method using MnO2/H2SO4 as the etchant to improve the adhesion between an epoxy polymer Surface and a metallic layer, was studied. The effects of bath temperature, Etching time and H2SO4 concentration on the Surface topography and chemical properties were investigated. After the Etching treatment of the MnO2–H2SO4 colloid, not only did the Surface roughness increase remarkably, but also the Surface of epoxy became hydrophilic and the contact angle of the epoxy Surface was also decreased from 93.5° to about 8.0°. The X-ray photoelectron spectroscopy analysis indicated that as a result of the Etching treatment, hydroxyl, carbonyl and carboxylic acid groups formed on the epoxy Surface. The adhesion strength was markedly enhanced with the appropriate Etching treatment, which was attributed to the improvement of the Surface roughness and the increased hydrophilicity.
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Pd-free Surface activation technique for ABS Surface metallisation
Transactions of The Institute of Metal Finishing, 2011Co-Authors: X L Yuan, Z F Yang, Zhixiang Wang, Zenglin WangAbstract:An environmentally friendly Surface Etching and Pd free activation technique for acrylonitrile–butadiene–styrene (ABS) Surface metallisation was investigated. With Surface Etching, NiSO4 absorption and NaBH4 reduction, nickel particles were deposited on the ABS Surface as a catalyst replacement for palladium catalyst to achieve Surface metallisation. After the electroless plating, a uniform copper film was electrodeposited on the ABS Surface. The effects of NiSO4 concentration, NaBH4 concentration, reduction temperature and reduction time on the adhesion strength between the ABS Surface and the electroless copper film were investigated. The adhesion strengths between electroless copper and ABS substrate reached 0·72 kN m−1, and indicated that this Surface activation technique was a feasible and cost effective method for ABS Surface metallisation.
Karl Joachim Ebeling - One of the best experts on this subject based on the ideXlab platform.
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Single-mode, single-polarization VCSELs via elliptical Surface Etching: experiments and theory
IEEE Journal of Selected Topics in Quantum Electronics, 2003Co-Authors: Pierluigi Debernardi, Heiko J. Unold, J. Maehnss, Rainer Michalzik, G.p. Bava, Karl Joachim EbelingAbstract:Polarization control in vertical-cavity Surface-emitting lasers (VCSELs) has attracted a lot of interest and different techniques have been proposed to achieve it. Among them, one of the most attractive relies on slight modifications of existing and well-behaving devices, i.e., by introducing a noncircular transverse section layer somewhere in the device. Even though experimental verifications of this principle have already been carried out, a theoretical framework to better understand and possibly optimize such devices is still missing. This mainly originates from the need of a fully vectorial and three-dimensional approach. In this paper, we will undertake a joint experimental and theoretical effort: first, we give experimental evidence of polarization control by applying elliptical Surface Etching. Then, after having validated the vectorial electromagnetic model by comparing numerical and experimental results, we are able for the first time to explain and compare the polarization selection mechanisms and, consequently, to provide guidelines for optimized structures.
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Polarisation control in VCSELs by elliptic Surface Etching
Electronics Letters, 2002Co-Authors: Heiko J. Unold, Rainer Michalzik, Michael C. Riedl, Karl Joachim EbelingAbstract:850 nm-wavelength vertical-cavity Surface-emitting lasers (VCSELs) with an elliptical shallow Surface relief having various aspect ratios and orientations have been fabricated. Using appropriate etch dimensions, VCSELs of up to 12.5 /spl mu/m active diameter are forced to operate on the fundamental mode for a certain current range. By aligning the longer axis of the etched ellipse with the [011] or [011~] crystal axis, the polarisation of the fundamental mode is pinned accordingly with a polarisation suppression ratio of /spl sim/30 dB.
