scholarly journals Thermo-responsive wettability via surface roughness change on polymer-coated titanate nanorod brushes toward fast and multi-directional droplet transport

RSC Advances ◽  
2020 ◽  
Vol 10 (47) ◽  
pp. 28032-28036
Author(s):  
Kenji Okada ◽  
Yoko Miura ◽  
Tomoya Chiya ◽  
Yasuaki Tokudome ◽  
Masahide Takahashi
Keyword(s):  
Surface Roughness ◽  
Thermal Expansion ◽  
Roughness Change ◽  
Droplet Transport ◽  
Smart Surface

Smart surface with thermo-responsive and reversible wettability is demonstrated by surface roughness change induced by thermal expansion of paraffin on titanate nanorods; it shows superhydrophobicity below 50 °C and less hydrophobicity above 50 °C.

scholarly journals Thermo-Responsive Wettability via Surface Roughness Change on Polymer-Coated Titanate Nanorod Brushes Toward Fast and Multi-Directional Droplet Transport

2020 ◽  
Author(s):  
Kenji Okada ◽  
Yoko Miura ◽  
Tomoya Chiya ◽  
Yasuaki Tokudome ◽  
Masahide Takahashi
Keyword(s):  
Surface Roughness ◽  
Contact Angle ◽  
Contact Angles ◽  
Roughness Change ◽  
Scientific Advancement ◽  
Novel Approach ◽  
Droplet Transport ◽  
Titanate Nanostructures ◽  
Selection Of ◽  
Smart Surface

A novel approach for thermo-responsive wettability has been accomplished by surface roughness change induced by thermal expansion of paraffin coated on titanate nanostructures. The surface exhibits thermo-responsive and reversible wettability change in a hydrophobic regime; the surface shows superhydrophobicity with contact angles of ~157° below 50 °C and ~118° above 50 °C due to a decrease of surface roughness caused by thermally-expanded paraffin at higher temperatures. Reversible wettability change of ~40° of a contact angle allows for a fast and multi-directional droplet transport. The present approach affords versatile selection of materials and wide variety of the contact angle, promoting both scientific advancement and technology innovation in the field of smart surface.

scholarly journals Thermo-Responsive Wettability via Surface Roughness Change on Polymer-Coated Titanate Nanorod Brushes Toward Fast and Multi-Directional Droplet Transport

2020 ◽  
Author(s):  
Kenji Okada ◽  
Yoko Miura ◽  
Tomoya Chiya ◽  
Yasuaki Tokudome ◽  
Masahide Takahashi
Keyword(s):  
Surface Roughness ◽  
Contact Angle ◽  
Contact Angles ◽  
Roughness Change ◽  
Scientific Advancement ◽  
Novel Approach ◽  
Droplet Transport ◽  
Titanate Nanostructures ◽  
Selection Of ◽  
Smart Surface

A novel approach for thermo-responsive wettability has been accomplished by surface roughness change induced by thermal expansion of paraffin coated on titanate nanostructures. The surface exhibits thermo-responsive and reversible wettability change in a hydrophobic regime; the surface shows superhydrophobicity with contact angles of ~157° below 50 °C and ~118° above 50 °C due to a decrease of surface roughness caused by thermally-expanded paraffin at higher temperatures. Reversible wettability change of ~40° of a contact angle allows for a fast and multi-directional droplet transport. The present approach affords versatile selection of materials and wide variety of the contact angle, promoting both scientific advancement and technology innovation in the field of smart surface.

Influence of Temperature Distribution on Tighten Force in Tie-Bolt Fastened Rotor With Considering Thermal Contact Conductance

2015 ◽  
Author(s):  
He Peng ◽  
Ning Xu ◽  
Zhansheng Liu
Keyword(s):  
Surface Roughness ◽  
Thermal Expansion ◽  
Temperature Distribution ◽  
Contact Pressure ◽  
Thermal Contact ◽  
Thermal Contact Conductance ◽  
Axial Position ◽  
Contact Conductance ◽  
Pressure Surface ◽  
Axial Temperature

Tighten force has much influence on tie-bolt fastened rotor dynamics. Temperature distribution in tie-bolt fastened rotor results in thermal expansion of rotor and rods. The difference of thermal expansion between rotor and rods causes the variation of bolt load. With considering the thermal contact conductance, the thermal model of tie-bolt fastened rotor was established by finite element method and the axial temperature distribution was obtained. The influences of surface roughness, nominal contact pressure and axial position of contact on axial temperature distribution were analysed. Based on temperature distribution in the tie-bolt fastened rotor, the variation of tighten force was investigated. Results show that nominal contact pressure, surface roughness and axial contact arrange have different influences on the variation of tighten force with temperature.

scholarly journals Mechanical Wear and Surface Roughness of Glass and Hybrid Ceramics

2019 ◽  
Vol 3 (2) ◽  
Keyword(s):  
Surface Roughness ◽  
Weight Loss ◽  
Wear Resistance ◽  
Glass Ceramic ◽  
High Surface ◽  
Lithium Disilicate ◽  
Mechanical Wear ◽  
Roughness Change ◽  
Before And After ◽  
Ceramic Blocks

Aim: The purpose of this invitro study was to evaluate wear resistance and surface roughness of two hybrid ceramics in comparison to lithium disilicate glass ceramic before and after mechanical abrasion. Materials and Methods: Thirty samples were divided according to material of construction into three groups, group (1): Lithium disilicate glass ceramic (IPS e.max, n=10), group (2): Resin nanoceramic (Lava Ultimate, n=10), group (3): Polymer infiltrated ceramic (Vita Enamic, n=10). All samples were fabricated out of CAD CAM ceramic blocks, weighed and evaluated for surface roughness before and after mechanical wear. Results: Resin nanoceramic (Lava ultimate), showed significantly low weight loss and surface roughness change after mechanical wear than IPS e.max. The polymer infiltrated ceramic (Vita Enamic) showed significantly high surface roughness than Resin nanoceramic (Lava ultimate), while IPS e.max showed the highest weight loss and surface roughness change. Conclusion: Resin nanoceramics revealed highest mechanical wear resistance contributed by terms of weight loss and surface roughness change, while Lithium disilicate glass ceramic showed the least wear resistance.

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