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Title: Role of surfactant in controlling the deposition pattern of a particle-laden droplet : fundamentals and strategies
Authors: Shao, Xiaoxiao
Duan, Fei
Hou, Yu
Zhong, Xin
Keywords: Engineering::Mechanical engineering
Issue Date: 2019
Source: Shao, X., Duan, F., Hou, Y. & Zhong, X. (2019). Role of surfactant in controlling the deposition pattern of a particle-laden droplet : fundamentals and strategies. Advances in Colloid and Interface Science, 275, 102049-.
Journal: Advances in Colloid and Interface Science
Abstract: Evaporation of particle-laden droplets has attracted wide attention propelled by the vast applications from disease diagnostics, bio-medicines, agriculture, inkjet printing to coating. Surfactant plays a vital role in controlling the deposition patterns of dried droplets, thanks to its extensive influences on particle transport through adsorbing at particle surface and droplet interfaces as well as suppressing or facilitating multiple flows. In order to accurately control the subtle morphology of a deposition, it is of significance to systematically elaborate the microscopic functions of surfactant, and bridge them to the various phenomena of a droplet. In this review, we first elucidate the effects of surfactant on the flow paradigms of capillary flow, solutal Marangoni flow, thermal Marangoni flow, and the mixed flow patterns as capillary force, thermal and solutal surface tensions are in competence or collaboration. Second, surfactant adsorption at particle surface and droplet interfaces modifying short-range and long-range forces such as electrostatic force, van der Waals force, capillary attraction, and hydrophobic bonding among particles and between particles and interfaces are introduced by the underlying mechanisms and approaches. Two phase diagrams are developed to respectively illustrate the roles of capillary force among particles, and the electrostatic interaction between particles and solid-liquid interface in modifying the deposition profiles. This review could build a fundamental framework of knowledge for evaporating particle-laden surfactant solution droplets, and may shed light on strategies to manipulate particle deposition in abundant fluidic-based techniques.
ISSN: 0001-8686
DOI: 10.1016/j.cis.2019.102049
Schools: School of Mechanical and Aerospace Engineering 
Rights: © 2019 Elsevier B.V. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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