Understanding Wetting Phenomena and Petal Effect in Plasma Sprayed Rare Earth Oxide Ceramic Coating

30 Pages Posted: 11 Jun 2019

See all articles by O. S. Asiq Rahman

O. S. Asiq Rahman

Indian Institute of Technology (IIT), Patna - Plasma Spray Coating Laboratory

Biswajyoti Mukherjee

Indian Institute of Technology (IIT), Patna - Plasma Spray Coating Laboratory

Sony Priyadershini

Indian Institute of Technology (IIT), Patna - Plasma Spray Coating Laboratory

MadhuRanjan Gunjan

Indian Institute of Technology (IIT), Patna - Thermal and Fluid Transport Laboratory

Rishi Raj

Indian Institute of Technology (IIT), Patna - Thermal and Fluid Transport Laboratory

S.T. Aruna

CSIR-National Aerospace Laboratories - Surface Engineering Division

Anup Kumar Keshri

Indian Institute of Technology (IIT), Patna - Plasma Spray Coating Laboratory

Date Written: June 9, 2019

Abstract

A sticky hydrophobic surface has prospective applications in microfluidic chips, no loss microdroplet transportation, biochemical detection and separation, quantitative transportation in biochips, and chemical microreactors, among others. Here we report fabrication and characterization of a novel sticky parahydrophobic cerium oxide (CeO2) coating using a facile and industrially viable plasma spray technique. Our coating displays significantly high water contact angle (WCA=159.02˚) along with a high contact angle hysteresis (CAH≥90˚), very much similar to a 'Rose petal'. This is further strengthened by the fact that the coating displayed remarkable adhesion even with large inverted water droplets of 70 μL, which is significantly higher than the reported values of 18 μL for polymer and 20 μL for drop casted CeO2 nanotubes. We also present systematic characterization results to clarify the ongoing confusion regarding the hydrophobicity of CeO2 coatings often reported in literature. Meanwhile, our parahydrophobic coating also showed remarkable thermal and mechanical stability even at a significantly high temperature of 200˚C for 14 hours and with 50 g abrasive paper. We believe that this study not only clarifies the ongoing debate regarding the wettability of rare earth coatings, but also offers a new paradigm for realizing robust industrial scale coatings for applications such as no loss microdroplets transportation.

Keywords: Plasma Spray Coatings, Cerium Oxide, Surface Roughness, Wettability

Suggested Citation

Rahman, O. S. Asiq and Mukherjee, Biswajyoti and Priyadershini, Sony and Gunjan, MadhuRanjan and Raj, Rishi and Aruna, S.T. and Keshri, Anup Kumar, Understanding Wetting Phenomena and Petal Effect in Plasma Sprayed Rare Earth Oxide Ceramic Coating (June 9, 2019). Available at SSRN: https://ssrn.com/abstract=3401356 or http://dx.doi.org/10.2139/ssrn.3401356

O. S. Asiq Rahman

Indian Institute of Technology (IIT), Patna - Plasma Spray Coating Laboratory

Bihta, Bihar, Patna 801103
India

Biswajyoti Mukherjee

Indian Institute of Technology (IIT), Patna - Plasma Spray Coating Laboratory

Bihta, Bihar, Patna 801103
India

Sony Priyadershini

Indian Institute of Technology (IIT), Patna - Plasma Spray Coating Laboratory

Bihta, Bihar, Patna 801103
India

MadhuRanjan Gunjan

Indian Institute of Technology (IIT), Patna - Thermal and Fluid Transport Laboratory

Bihta, Bihar, Patna 801103
India

Rishi Raj

Indian Institute of Technology (IIT), Patna - Thermal and Fluid Transport Laboratory

Bihta, Bihar, Patna 801103
India

S.T. Aruna

CSIR-National Aerospace Laboratories - Surface Engineering Division

Bangalore, Karnataka 560017
India

Anup Kumar Keshri (Contact Author)

Indian Institute of Technology (IIT), Patna - Plasma Spray Coating Laboratory ( email )

Bihta, Bihar, Patna 801103
India

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