Physicochemical Hydrodynamics In Confined Multicomponent Liquids

Lijun Thayyil Raju

Research output: ThesisPhD Thesis - Research UT, graduation UT

299 Downloads (Pure)

Abstract

Evaporation of multicomponent liquids plays a crucial role in industrial applications as well as biological and physical phenomena. We begin this thesis by discussing the importance of evaporation and describing the physicochemical hydrodynamics triggered by the evaporation of confined multicomponent liquids (Chapter 1).

In Chapter 2, we study droplets containing water, glycerol, and colloidal particles using experiments, simulations, and analytical modelling. We show that the solutal Marangoni flow triggered by the evaporation of water leads to the formation of a ‘Marangoni ring’. However, we also show that surfactants and non-hydrodynamic interactions might be crucial to fully explain all the processes in this system.

In Chapters 3 and 4, we study the formation of supraparticles created by evaporating ternary (Ouzo) droplets containing colloidal particles. In particular, we show that changing the size of individual particles changes the final shape of the supraparticle (Chapter 3). Moreover, we also show that changes in surface charge and hydration of the particles could even suppress the formation of supraparticles (Chapter 4). Thus, we can tune the formation of supraparticles in colloidal ternary droplets by carefully choosing the properties of the constituent particles.

In Chapter 5, we show, using experiments and simulations, that adding glycerol slows down the evaporation of water from a capillary tube. Using a simplified analytical model, we show how diffusion, advection, size of the liquid column, and changes in interfacial concentration of water determine the different evaporation regimes.

In short, we studied the spectacular and intriguing physicochemical hydrodynamics triggered by the evaporation of multicomponent liquids from two complementary systems: droplets and capillaries. These studies can be extended to produce novel multifunctional supraparticles, to have a deeper understanding of the drying of respiratory droplets, and for further technological advancements in inkjet printing.
Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
  • University of Twente
Supervisors/Advisors
  • Lohse, Detlef, Supervisor
  • Zhang, Xuehua, Supervisor
Award date12 Jan 2023
Place of PublicationEnschede
Publisher
Print ISBNs978-90-365-5520-3
Electronic ISBNs978-90-365-5521-0
DOIs
Publication statusPublished - Jan 2023

Keywords

  • Droplets
  • Capillaries
  • Evaporation
  • Colloids
  • Hydrodynamics

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