Influence of surface roughness frequencies and roughness parameters on lubricant wettability transitions in micro-nano scale hierarchical surfaces

Edachery, V and Swamybabu, V and Adarsh, D and Kailas, SV (2022) Influence of surface roughness frequencies and roughness parameters on lubricant wettability transitions in micro-nano scale hierarchical surfaces. In: Tribology International, 165 .

PDF tri_int_165_2022.pdf - Published Version Restricted to Registered users only Download (5MB) | Request a copy

Abstract

In this work, the influence of surface roughness frequencies and roughness parameters on mixed wetting and its transitions are discussed. Sessile drop experiments were conducted on hierarchical engineering surfaces having multiple roughness frequencies. Results show that the net roughness Ra or Rq (RMS roughness) solely cannot dictate the wettability behavior. Fourier Band Pass Filtering (FBPF) and Power Spectral Density (PSD) analysis revealed that all roughness frequencies in a hierarchical rough surface contribute to the net Ra and Rq; however, all need not contribute to wettability transitions. Rz and LSm were found to be the roughness parameters that could predict the range of spatial roughness frequencies that dictate wettability transitions to near Wenzel and Cassie-Baxter states.

Item Type:	Journal Article
Publication:	Tribology International
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to the Elsevier Ltd.
Keywords:	Nanotechnology; Spectral density; Wetting, Drop experiments; Engineering surfaces; Frequency parameters; Hierarchical surfaces; Micro-nano scale; RMS roughness; Roughness frequency; Roughness parameters; Sessile drops; Surface roughness parameters, Surface roughness
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	08 Jul 2022 06:07
Last Modified:	08 Jul 2022 06:07
URI:	https://eprints.iisc.ac.in/id/eprint/74291

Actions (login required)

View Item