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Bharathibai J. Basu - One of the best experts on this subject based on the ideXlab platform.
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superhydrophobic oleophobic pdms silica Nanocomposite Coating
Surface Innovations, 2013Co-Authors: Bharathibai J. Basu, T. Bharathidasan, C AnandanAbstract:In general, most of the artificial superhydrophobic surfaces are oleophilic. These surfaces can be rendered oil repellent by introducing low-surface-energy fluoroalkyl groups on the surface. In the present study, superhydrophobic polydimethylsiloxane (PDMS)-silica Nanocomposite Coating was converted from oleophilic to oleophobic state by applying fluoroalkylsilane (FAS) layers as topcoat. The effect of fluoroalkyl groups on the wettability and surface morphology was studied. It was found that there was a difference in the wettability behavior obtained by hydrolyzed and unhydrolyzed FAS. The oil contact angle (oil CA) was higher after the treatment of PDMS-silica Coating with hydrolyzed FAS than that obtained with unhydrolyzed FAS. However, water contact angle (water CA) decreased as the number of passes of hydrolyzed FAS increased, whereas water CA was not affected by applying same number of passes of unhydrolyzed FAS. The surface morphology was characterized by field emission scanning electron microscopy...
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surface studies on superhydrophobic and oleophobic polydimethylsiloxane silica Nanocomposite Coating system
Applied Surface Science, 2012Co-Authors: Bharathibai J. Basu, Dinesh V Kumar, C AnandanAbstract:Abstract Superhydrophobic and oleophobic polydimethylsiloxane (PDMS)–silica Nanocomposite double layer Coating was fabricated by applying a thin layer of low surface energy fluoroalkyl silane (FAS) as topcoat. The Coatings exhibited WCA of 158–160° and stable oleophobic property with oil CA of 79°. The surface morphology was characterized by field emission scanning electron microscopy (FESEM) and surface chemical composition was determined by energy dispersive X-ray spectrometery (EDX) and X-ray photoelectron spectroscopy (XPS). FESEM images of the Coatings showed micro-nano binary structure. The improved oleophobicity was attributed to the combined effect of low surface energy of FAS and roughness created by the random distribution of silica aggregates. This is a facile, cost-effective method to obtain superhydrophobic and oleophobic surfaces on larger area of various substrates.
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fabrication of superhydrophobic and oleophobic sol gel Nanocomposite Coating
Surface & Coatings Technology, 2012Co-Authors: R. V. Lakshmi, T. Bharathidasan, Parthasarathi Bera, Bharathibai J. BasuAbstract:Abstract Superhydrophobic sol–gel Nanocomposite Coatings with improved oleophobic property were obtained by incorporation of a perfluoroalkylmethacrylic copolymer in a hybrid sol–gel matrix containing fumed silica nanoparticles. The Coatings exhibited a water contact angle (WCA) of 158° and contact angle of 146° for ethylene glycol and 113° for lubricant oil. Though the sol–gel Nanocomposite Coatings in the absence of fluoropolymer were superhydrophobic with WCA of 155°, they were oleophilic with oil contact angle of
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Fabrication of Superhydrophobic and Oleophobic sol–gel Nanocomposite Coating
Surface & Coatings Technology, 2012Co-Authors: R. V. Lakshmi, T. Bharathidasan, Parthasarathi Bera, Bharathibai J. BasuAbstract:Abstract Superhydrophobic sol–gel Nanocomposite Coatings with improved oleophobic property were obtained by incorporation of a perfluoroalkylmethacrylic copolymer in a hybrid sol–gel matrix containing fumed silica nanoparticles. The Coatings exhibited a water contact angle (WCA) of 158° and contact angle of 146° for ethylene glycol and 113° for lubricant oil. Though the sol–gel Nanocomposite Coatings in the absence of fluoropolymer were superhydrophobic with WCA of 155°, they were oleophilic with oil contact angle of
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Fabrication of superhydrophobic and oleophobic sol-gel Nanocomposite Coating
Surface and Coatings Technology, 2012Co-Authors: R. V. Lakshmi, T. Bharathidasan, Parthasarathi Bera, Bharathibai J. BasuAbstract:Superhydrophobic sol-gel Nanocomposite Coatings with improved oleophobic property were obtained by incorporation of a perfluoroalkylmethacrylic copolymer in a hybrid sol-gel matrix containing fumed silica nanoparticles. The Coatings exhibited a water contact angle (WCA) of 158° and contact angle of 146° for ethylene glycol and 113° for lubricant oil. Though the sol-gel Nanocomposite Coatings in the absence of fluoropolymer were superhydrophobic with WCA of 155°, they were oleophilic with oil contact angle of < 10°. The enhanced oleophobicity can be attributed to the further lowering of surface energy by the presence of fluoropolymer. FESEM images of the Coating showed a highly porous structure with random distribution of aggregates of silica nanospheres. The Coatings were characterized using FTIR, EDX and XPS. These studies indicated adsorption of fluoropolymer on the Coating surface. The method is simple and cost-effective and can be used for preparing multifunctional water- and oil-repellent self-cleaning Coatings on large areas of different kinds of substrates like glass, metal and composites. © 2012 Elsevier B.V.
R. V. Lakshmi - One of the best experts on this subject based on the ideXlab platform.
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Fabrication of Superhydrophobic and Oleophobic sol–gel Nanocomposite Coating
Surface & Coatings Technology, 2012Co-Authors: R. V. Lakshmi, T. Bharathidasan, Parthasarathi Bera, Bharathibai J. BasuAbstract:Abstract Superhydrophobic sol–gel Nanocomposite Coatings with improved oleophobic property were obtained by incorporation of a perfluoroalkylmethacrylic copolymer in a hybrid sol–gel matrix containing fumed silica nanoparticles. The Coatings exhibited a water contact angle (WCA) of 158° and contact angle of 146° for ethylene glycol and 113° for lubricant oil. Though the sol–gel Nanocomposite Coatings in the absence of fluoropolymer were superhydrophobic with WCA of 155°, they were oleophilic with oil contact angle of
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fabrication of superhydrophobic and oleophobic sol gel Nanocomposite Coating
Surface & Coatings Technology, 2012Co-Authors: R. V. Lakshmi, T. Bharathidasan, Parthasarathi Bera, Bharathibai J. BasuAbstract:Abstract Superhydrophobic sol–gel Nanocomposite Coatings with improved oleophobic property were obtained by incorporation of a perfluoroalkylmethacrylic copolymer in a hybrid sol–gel matrix containing fumed silica nanoparticles. The Coatings exhibited a water contact angle (WCA) of 158° and contact angle of 146° for ethylene glycol and 113° for lubricant oil. Though the sol–gel Nanocomposite Coatings in the absence of fluoropolymer were superhydrophobic with WCA of 155°, they were oleophilic with oil contact angle of
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Fabrication of superhydrophobic and oleophobic sol-gel Nanocomposite Coating
Surface and Coatings Technology, 2012Co-Authors: R. V. Lakshmi, T. Bharathidasan, Parthasarathi Bera, Bharathibai J. BasuAbstract:Superhydrophobic sol-gel Nanocomposite Coatings with improved oleophobic property were obtained by incorporation of a perfluoroalkylmethacrylic copolymer in a hybrid sol-gel matrix containing fumed silica nanoparticles. The Coatings exhibited a water contact angle (WCA) of 158° and contact angle of 146° for ethylene glycol and 113° for lubricant oil. Though the sol-gel Nanocomposite Coatings in the absence of fluoropolymer were superhydrophobic with WCA of 155°, they were oleophilic with oil contact angle of < 10°. The enhanced oleophobicity can be attributed to the further lowering of surface energy by the presence of fluoropolymer. FESEM images of the Coating showed a highly porous structure with random distribution of aggregates of silica nanospheres. The Coatings were characterized using FTIR, EDX and XPS. These studies indicated adsorption of fluoropolymer on the Coating surface. The method is simple and cost-effective and can be used for preparing multifunctional water- and oil-repellent self-cleaning Coatings on large areas of different kinds of substrates like glass, metal and composites. © 2012 Elsevier B.V.
Sujeet K. Sinha - One of the best experts on this subject based on the ideXlab platform.
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dry sliding and boundary lubrication performance of a uhmwpe cnts Nanocomposite Coating on steel substrates at elevated temperatures
Wear, 2011Co-Authors: Abdul M Samad, Sujeet K. SinhaAbstract:A Nanocomposite polymer Coating of ultra-high molecular weight polyethylene (UHMWPE) reinforced with 0.1 wt% of single-walled carbon nanotubes (SWCNTs) is developed and coated onto steel substrates for a possible application as a boundary lubricant in bearings and gears. Since temperature is one of the predominant factors in determining the tribological performance of polymer Coatings, friction and wear experiments were carried out at elevated temperatures. Experiments are performed on a custom-built tribometer simulating high contact pressures under dry and base oil lubricated conditions. Wear mechanisms of the Nanocomposite Coating and the counterface material are studied using optical profilometry. FESEM images are used to study the wear morphology of the Coating. Possible changes in the crystallinity of the polymer due to temperature changes are studied by XRD. It is observed that the addition of SWCNTs to the polymer matrix not only helps in improving the mechanical properties such as hardness and the load bearing capacity of the Coating but also enhances its frictional and wear properties at elevated temperatures.
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Dry sliding and boundary lubrication performance of a UHMWPE/CNTs Nanocomposite Coating on steel substrates at elevated temperatures
Wear, 2011Co-Authors: M. Abdul Samad, Sujeet K. SinhaAbstract:A Nanocomposite polymer Coating of ultra-high molecular weight polyethylene (UHMWPE) reinforced with 0.1 wt% of single-walled carbon nanotubes (SWCNTs) is developed and coated onto steel substrates for a possible application as a boundary lubricant in bearings and gears. Since temperature is one of the predominant factors in determining the tribological performance of polymer Coatings, friction and wear experiments were carried out at elevated temperatures. Experiments are performed on a custom-built tribometer simulating high contact pressures under dry and base oil lubricated conditions. Wear mechanisms of the Nanocomposite Coating and the counterface material are studied using optical profilometry. FESEM images are used to study the wear morphology of the Coating. Possible changes in the crystallinity of the polymer due to temperature changes are studied by XRD. It is observed that the addition of SWCNTs to the polymer matrix not only helps in improving the mechanical properties such as hardness and the load bearing capacity of the Coating but also enhances its frictional and wear properties at elevated temperatures.
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Dry sliding and boundary lubrication performance of a UHMWPE/CNTs Nanocomposite Coating on steel substrates at elevated temperatures
Wear, 2011Co-Authors: M. Abdul Samad, Sujeet K. SinhaAbstract:A Nanocomposite polymer Coating of ultra-high molecular weight polyethylene (UHMWPE) reinforced with 0.1. wt% of single-walled carbon nanotubes (SWCNTs) is developed and coated onto steel substrates for a possible application as a boundary lubricant in bearings and gears. Since temperature is one of the predominant factors in determining the tribological performance of polymer Coatings, friction and wear experiments were carried out at elevated temperatures. Experiments are performed on a custom-built tribometer simulating high contact pressures under dry and base oil lubricated conditions. Wear mechanisms of the Nanocomposite Coating and the counterface material are studied using optical profilometry. FESEM images are used to study the wear morphology of the Coating. Possible changes in the crystallinity of the polymer due to temperature changes are studied by XRD. It is observed that the addition of SWCNTs to the polymer matrix not only helps in improving the mechanical properties such as hardness and the load bearing capacity of the Coating but also enhances its frictional and wear properties at elevated temperatures. © 2010 Elsevier B.V.
Edith Mader - One of the best experts on this subject based on the ideXlab platform.
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development of functional glass fibres with Nanocomposite Coating a comparative study
Composites Part A-applied Science and Manufacturing, 2013Co-Authors: Edith MaderAbstract:This paper reports the application of polymer-based Nanocomposites containing epoxy and carbon-based nanoparticles (carbon nanotubes and graphene) as a functional Coating for glass fibres. The mechanical, electrical and barrier performance of glass fibres with different Coatings are studied and compared. The results show that both mechanical and electrical properties of glass fibres are significantly enhanced after Nanocomposites Coating. An interesting observation is that when graphene is used as nanoscale filler in the Nanocomposites, the Coating functions as a barrier layer to prevent glass fibres from environmental attacks. The mechanisms behind these observations are illustrated and the potential application of functional fibres is discussed. © 2012 Elsevier Ltd.
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tensile strength of glass fibres with carbon nanotube epoxy Nanocomposite Coating effects of cnt morphology and dispersion state
Composites Part A-applied Science and Manufacturing, 2010Co-Authors: Naveed A Siddiqui, Erin L Li, Man Lung Sham, Ben Zhong Tang, Edith MaderAbstract:Abstract The effects of carbon nanotube (CNT)–epoxy Nanocomposite Coating applied to glass fibre surface on tensile strength of single glass fibres are evaluated at different gauge lengths. The crack healing efficiencies obtained using two different types of CNTs with different structures, morphologies and dispersion characteristics in various concentrations are specifically studied. The results indicate that the tensile strength of single fibres increased significantly with increasing CNT content up to a certain level, depending on the type of CNTs. The crack healing efficiency was much higher for the fibres coated with straight, less entangled CNTs than those with highly entangled CNTs, indicating the CNT dispersion state in the Coating played an important role. A strong correlation is established between the CNT dispersion state, the tensile properties of Nanocomposite and the tensile strengths of fibres with the Nanocomposite Coating.
T. Bharathidasan - One of the best experts on this subject based on the ideXlab platform.
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superhydrophobic oleophobic pdms silica Nanocomposite Coating
Surface Innovations, 2013Co-Authors: Bharathibai J. Basu, T. Bharathidasan, C AnandanAbstract:In general, most of the artificial superhydrophobic surfaces are oleophilic. These surfaces can be rendered oil repellent by introducing low-surface-energy fluoroalkyl groups on the surface. In the present study, superhydrophobic polydimethylsiloxane (PDMS)-silica Nanocomposite Coating was converted from oleophilic to oleophobic state by applying fluoroalkylsilane (FAS) layers as topcoat. The effect of fluoroalkyl groups on the wettability and surface morphology was studied. It was found that there was a difference in the wettability behavior obtained by hydrolyzed and unhydrolyzed FAS. The oil contact angle (oil CA) was higher after the treatment of PDMS-silica Coating with hydrolyzed FAS than that obtained with unhydrolyzed FAS. However, water contact angle (water CA) decreased as the number of passes of hydrolyzed FAS increased, whereas water CA was not affected by applying same number of passes of unhydrolyzed FAS. The surface morphology was characterized by field emission scanning electron microscopy...
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fabrication of superhydrophobic and oleophobic sol gel Nanocomposite Coating
Surface & Coatings Technology, 2012Co-Authors: R. V. Lakshmi, T. Bharathidasan, Parthasarathi Bera, Bharathibai J. BasuAbstract:Abstract Superhydrophobic sol–gel Nanocomposite Coatings with improved oleophobic property were obtained by incorporation of a perfluoroalkylmethacrylic copolymer in a hybrid sol–gel matrix containing fumed silica nanoparticles. The Coatings exhibited a water contact angle (WCA) of 158° and contact angle of 146° for ethylene glycol and 113° for lubricant oil. Though the sol–gel Nanocomposite Coatings in the absence of fluoropolymer were superhydrophobic with WCA of 155°, they were oleophilic with oil contact angle of
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Fabrication of Superhydrophobic and Oleophobic sol–gel Nanocomposite Coating
Surface & Coatings Technology, 2012Co-Authors: R. V. Lakshmi, T. Bharathidasan, Parthasarathi Bera, Bharathibai J. BasuAbstract:Abstract Superhydrophobic sol–gel Nanocomposite Coatings with improved oleophobic property were obtained by incorporation of a perfluoroalkylmethacrylic copolymer in a hybrid sol–gel matrix containing fumed silica nanoparticles. The Coatings exhibited a water contact angle (WCA) of 158° and contact angle of 146° for ethylene glycol and 113° for lubricant oil. Though the sol–gel Nanocomposite Coatings in the absence of fluoropolymer were superhydrophobic with WCA of 155°, they were oleophilic with oil contact angle of
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Fabrication of superhydrophobic and oleophobic sol-gel Nanocomposite Coating
Surface and Coatings Technology, 2012Co-Authors: R. V. Lakshmi, T. Bharathidasan, Parthasarathi Bera, Bharathibai J. BasuAbstract:Superhydrophobic sol-gel Nanocomposite Coatings with improved oleophobic property were obtained by incorporation of a perfluoroalkylmethacrylic copolymer in a hybrid sol-gel matrix containing fumed silica nanoparticles. The Coatings exhibited a water contact angle (WCA) of 158° and contact angle of 146° for ethylene glycol and 113° for lubricant oil. Though the sol-gel Nanocomposite Coatings in the absence of fluoropolymer were superhydrophobic with WCA of 155°, they were oleophilic with oil contact angle of < 10°. The enhanced oleophobicity can be attributed to the further lowering of surface energy by the presence of fluoropolymer. FESEM images of the Coating showed a highly porous structure with random distribution of aggregates of silica nanospheres. The Coatings were characterized using FTIR, EDX and XPS. These studies indicated adsorption of fluoropolymer on the Coating surface. The method is simple and cost-effective and can be used for preparing multifunctional water- and oil-repellent self-cleaning Coatings on large areas of different kinds of substrates like glass, metal and composites. © 2012 Elsevier B.V.
