Paper Title:
Spreading Exponents: Dynamics of Trisiloxane Wetting of Hydrophobic Surfaces
  Abstract

The excellent spreading and wetting behaviour of superspreader solutions has been known and extensively studied over recent years. However, explanations for spreading dynamics and accompanying mathematical models have not yet proved completely successful. Many attempts have been made to quantify the spreading exponents, but none of the models so far was able successfully to describe the whole wetting process of trisiloxane solutions, especially on hydrophobic surfaces. We have investigated the partial wetting of Silwet L-77® superspreader solutions of high concentrations (well above CMC) on polymer coated substrates of varying hydrophobicity. Results obtained can be explained in terms of the Marangoni effect as the major driving force for trisiloxane enhanced spreading. A simple theory, which involves surface tension gradients governing the spreading process, was developed in order to explain the specific evolution of the drop radius and consequent decrease in the contact angle. The proposed model was found to be in excellent agreement with the experimental results. Determined equation coefficients were shown to be dependent on both surfactant concentration and the hydrophobicity of the substrate.

  Info
Periodical
Defect and Diffusion Forum (Volumes 303-304)
Edited by
David J. Fisher
Pages
139-145
DOI
10.4028/www.scientific.net/DDF.303-304.139
Citation
J. Radulovic, K. Sefiane, M. E.R. Shanahan, "Spreading Exponents: Dynamics of Trisiloxane Wetting of Hydrophobic Surfaces", Defect and Diffusion Forum, Vols. 303-304, pp. 139-145, 2010
Online since
July 2010
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Hua Feng Zhang, Yu Zhong Zhang, Li Gang Lin, Xiao Li Ding, Hong Li
Abstract:Polyvinylidene fluoride (PVDF) hydrophobic membrane has been prepared by phase inversion method. The effects of concentration of PVDF,...
338
Authors: Shu Liang Wang, Chang Yu Liu, Hui Ming Du, Hua Ma, Cheng Xie, Cheng Yu Wang
Chapter 2: Metal Casting Processes and Equipment
Abstract:A layer of sword-like super-hydrophobic film was fabricated on wood surface through an alkaline hydrothermal method. The super-hydrophobic...
1680
Authors: Qun Jie Xu, Xi Hong Cai, Hong Yun, Xian Qin Deng
Chapter 1: Development and Utilization of Solar Energy
Abstract:A novel hydrophobic film was prepared by Stearic acid (SA) chemically adsorbed onto the cupronickel B30 surface. The film properties were...
560
Authors: Zhuang Liu, Lin Zhu, Jing Lin, Zhi Hui Sun
Chapter 2: Packaging Materials
Abstract:A simple chemical etching method was developed for corrosion of the pre-sensitized plate aluminium substrate in order to be a rough surface....
427
Authors: Zhen Zhang, Hui You Zhao, Yu Lin Chen, De Shun Sun, Cheng Song Fu
Abstract:Fly ash, as a raw materials,is used to prepare micro-nanostructural beads with the surface modified by using silane coupling agent. The...
504