The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform
Kiran Kripa Varanasi - One of the best experts on this subject based on the ideXlab platform.
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Hydrophobicity of rare-earth Oxide Ceramics
Nature Materials, 2013Co-Authors: Gisele Azimi, Hyuk-min Kwon, Adam T Paxson, Rajeev Dhiman, Kiran Kripa VaranasiAbstract:Hydrophobic materials that are robust to harsh environments are needed in a broad range of applications. Although durable materials such as metals and Ceramics, which are generally hydrophilic, can be rendered hydrophobic by polymeric modifiers, these deteriorate in harsh environments. Here we show that a class of Ceramics comprising the entire lanthanide Oxide series, ranging from ceria to lutecia, is intrinsically hydrophobic. We attribute their hydrophobicity to their unique electronic structure, which inhibits hydrogen bonding with interfacial water molecules. We also show with surface-energy measurements that polar interactions are minimized at these surfaces and with Fourier transform infrared/grazing-angle attenuated total reflection that interfacial water molecules are oriented in the hydrophobic hydration structure. Moreover, we demonstrate that these ceramic materials promote dropwise condensation, repel impinging water droplets, and sustain hydrophobicity even after exposure to harsh environments. Rare-earth Oxide Ceramics should find widespread applicability as robust hydrophobic surfaces.
Gisele Azimi - One of the best experts on this subject based on the ideXlab platform.
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superhydrophobic surfaces by laser ablation of rare earth Oxide Ceramics
MRS Communications, 2014Co-Authors: Gisele Azimi, Hyuk-min Kwon, Kripa K VaranasiAbstract:Robust superhydrophobic surfaces can improve the performance of various applications. Considerable research has focused on developing superhydrophobic surfaces, but in these studies, superhydrophobicity was attained using polymeric materials, which deteriorate under harsh environments. Recently, it has been shown that rare-earth Oxide Ceramics are hydrophobic and since they are Ceramics, they withstand harsh environments including high temperature. Here we fabricate a superhydrophobic surface by texturing a ceria pellet using laser ablation. We demonstrate water repellency by showing an impinging water droplet bouncing off the surface. This study extends the possibility of producing robust superhydrophobic Ceramics using accessible techniques for industrial applications.
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Hydrophobicity of rare-earth Oxide Ceramics
Nature Materials, 2013Co-Authors: Gisele Azimi, Hyuk-min Kwon, Adam T Paxson, Rajeev Dhiman, Kiran Kripa VaranasiAbstract:Hydrophobic materials that are robust to harsh environments are needed in a broad range of applications. Although durable materials such as metals and Ceramics, which are generally hydrophilic, can be rendered hydrophobic by polymeric modifiers, these deteriorate in harsh environments. Here we show that a class of Ceramics comprising the entire lanthanide Oxide series, ranging from ceria to lutecia, is intrinsically hydrophobic. We attribute their hydrophobicity to their unique electronic structure, which inhibits hydrogen bonding with interfacial water molecules. We also show with surface-energy measurements that polar interactions are minimized at these surfaces and with Fourier transform infrared/grazing-angle attenuated total reflection that interfacial water molecules are oriented in the hydrophobic hydration structure. Moreover, we demonstrate that these ceramic materials promote dropwise condensation, repel impinging water droplets, and sustain hydrophobicity even after exposure to harsh environments. Rare-earth Oxide Ceramics should find widespread applicability as robust hydrophobic surfaces.
Matthias Kern - One of the best experts on this subject based on the ideXlab platform.
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bonding to Oxide Ceramics laboratory testing versus clinical outcome
Dental Materials, 2015Co-Authors: Matthias KernAbstract:Abstract Objectives Despite a huge number of published laboratory bonding studies on dental Oxide Ceramics clinical long-term studies on resin bonded Oxide ceramic restorations are rare. The purpose of this review is to present the best available clinical evidence for successful bonding of dental Oxide ceramic restorations. Methods Clinical trials with resin-bonded restorations that had no or only limited mechanical retention and were made from alumina or zirconia ceramic were identified using an electronic search in PubMed database. Overall 10 publications with clinical trials could be identified. Their clinical outcome was compared with that laboratory bond strength studies. Results Clinical data provide strong evidence that air-abrasion at a moderate pressure in combination with using phosphate monomer containing primers and/or luting resins provide long-term durable bonding to glass-infiltrated alumina and zirconia ceramic under the humid and stressful oral conditions. Significance As simple and clinically reliable bonding methods to Oxide Ceramics exist, the rationale for development of alternative bonding methods might be reconsidered especially when these methods are more time consuming or require rather complicated and/or technique sensitive procedures.
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Bonding to Oxide Ceramics—Laboratory testing versus clinical outcome
Dental Materials, 2014Co-Authors: Matthias KernAbstract:Abstract Objectives Despite a huge number of published laboratory bonding studies on dental Oxide Ceramics clinical long-term studies on resin bonded Oxide ceramic restorations are rare. The purpose of this review is to present the best available clinical evidence for successful bonding of dental Oxide ceramic restorations. Methods Clinical trials with resin-bonded restorations that had no or only limited mechanical retention and were made from alumina or zirconia ceramic were identified using an electronic search in PubMed database. Overall 10 publications with clinical trials could be identified. Their clinical outcome was compared with that laboratory bond strength studies. Results Clinical data provide strong evidence that air-abrasion at a moderate pressure in combination with using phosphate monomer containing primers and/or luting resins provide long-term durable bonding to glass-infiltrated alumina and zirconia ceramic under the humid and stressful oral conditions. Significance As simple and clinically reliable bonding methods to Oxide Ceramics exist, the rationale for development of alternative bonding methods might be reconsidered especially when these methods are more time consuming or require rather complicated and/or technique sensitive procedures.
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resin bonding to Oxide Ceramics for dental restorations
Journal of Adhesion Science and Technology, 2009Co-Authors: Matthias KernAbstract:Bonding to silica-based dental Ceramics using etching techniques and silanization is well established, but for bonding of dental Oxide Ceramics with little or no silica no particular method is generally accepted. Therefore, the purpose of this review is to summarize the current knowledge on bonding to dental Oxide Ceramics. Approved bonding methods to dental Oxide Ceramics require first cleaning, roughening and chemical activation through air-abrasion by pure alumina or silica-coated alumina particles. Secondly, chemical coupling agents such as phosphate monomers or silanes are used depending on the surface composition after air-abrasion. Although a large number of laboratory bonding studies on dental Oxide Ceramics exist, clinical long-term studies on bonded Oxide ceramic restorations without mechanical retention are still needed to prove whether laboratory bonding methods provide long-term durable adhesion under clinical conditions.
Hyuk-min Kwon - One of the best experts on this subject based on the ideXlab platform.
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superhydrophobic surfaces by laser ablation of rare earth Oxide Ceramics
MRS Communications, 2014Co-Authors: Gisele Azimi, Hyuk-min Kwon, Kripa K VaranasiAbstract:Robust superhydrophobic surfaces can improve the performance of various applications. Considerable research has focused on developing superhydrophobic surfaces, but in these studies, superhydrophobicity was attained using polymeric materials, which deteriorate under harsh environments. Recently, it has been shown that rare-earth Oxide Ceramics are hydrophobic and since they are Ceramics, they withstand harsh environments including high temperature. Here we fabricate a superhydrophobic surface by texturing a ceria pellet using laser ablation. We demonstrate water repellency by showing an impinging water droplet bouncing off the surface. This study extends the possibility of producing robust superhydrophobic Ceramics using accessible techniques for industrial applications.
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Hydrophobicity of rare-earth Oxide Ceramics
Nature Materials, 2013Co-Authors: Gisele Azimi, Hyuk-min Kwon, Adam T Paxson, Rajeev Dhiman, Kiran Kripa VaranasiAbstract:Hydrophobic materials that are robust to harsh environments are needed in a broad range of applications. Although durable materials such as metals and Ceramics, which are generally hydrophilic, can be rendered hydrophobic by polymeric modifiers, these deteriorate in harsh environments. Here we show that a class of Ceramics comprising the entire lanthanide Oxide series, ranging from ceria to lutecia, is intrinsically hydrophobic. We attribute their hydrophobicity to their unique electronic structure, which inhibits hydrogen bonding with interfacial water molecules. We also show with surface-energy measurements that polar interactions are minimized at these surfaces and with Fourier transform infrared/grazing-angle attenuated total reflection that interfacial water molecules are oriented in the hydrophobic hydration structure. Moreover, we demonstrate that these ceramic materials promote dropwise condensation, repel impinging water droplets, and sustain hydrophobicity even after exposure to harsh environments. Rare-earth Oxide Ceramics should find widespread applicability as robust hydrophobic surfaces.
Rajeev Dhiman - One of the best experts on this subject based on the ideXlab platform.
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Hydrophobicity of rare-earth Oxide Ceramics
Nature Materials, 2013Co-Authors: Gisele Azimi, Hyuk-min Kwon, Adam T Paxson, Rajeev Dhiman, Kiran Kripa VaranasiAbstract:Hydrophobic materials that are robust to harsh environments are needed in a broad range of applications. Although durable materials such as metals and Ceramics, which are generally hydrophilic, can be rendered hydrophobic by polymeric modifiers, these deteriorate in harsh environments. Here we show that a class of Ceramics comprising the entire lanthanide Oxide series, ranging from ceria to lutecia, is intrinsically hydrophobic. We attribute their hydrophobicity to their unique electronic structure, which inhibits hydrogen bonding with interfacial water molecules. We also show with surface-energy measurements that polar interactions are minimized at these surfaces and with Fourier transform infrared/grazing-angle attenuated total reflection that interfacial water molecules are oriented in the hydrophobic hydration structure. Moreover, we demonstrate that these ceramic materials promote dropwise condensation, repel impinging water droplets, and sustain hydrophobicity even after exposure to harsh environments. Rare-earth Oxide Ceramics should find widespread applicability as robust hydrophobic surfaces.
