Measuring Interfacial Viscosity Using Macro- and Micro-rheology 公开

Sebel, James Nicholas (2011)

Permanent URL: https://etd.library.emory.edu/concern/etds/h415pb28s?locale=zh
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Abstract

Abstract
Measuring Interfacial Viscosity Using Macro- and Micro-rheology
We measure the viscous moduli of thin films using two different methods. First, we use a
magnetic needle viscometer. Our apparatus employs Helmholtz coils to control the position and
orientation of the needle in the film. By driving the needle we can produce a response in the film
which allows us to probe the bulk viscous properties of thes film. Second, we use single particle
microrheology to probe the local properties of the film. Tracking the mean-squared displacement
of particles as they undergo Brownian motion probes the local viscous properties of the surface.
Coupling this technique with the magnetic needle viscometer provides information on the effect
local viscous properties have on the bulk properties.
We begin with a general introduction to surface rheology and the techniques involved.
Then we discuss the experimental techniques, including the method of building the magnetic
needle viscometer, why certain decisions regarding its construction were made, the micro-
rheology technique and sample preparation. The results section includes unexpected deviations
in our experiments and possible reasons for these. Finally, the discussion highlights the future
directions of the project.

Table of Contents

Table of Contents

Introduction

....................................................................................................... 1
Materials and Methods .................................................................................... 3
Helmholtz Coils ......................................................................................................... 3
Magnetic Needle ........................................................................................................ 8
High-Speed Camera .................................................................................................. 14
Sample Preparation .................................................................................................. 17
One Particle Mean-Squared Displacement ............................................................ 15
Tracking ..................................................................................................................... 18
Results ................................................................................................................ 19
Discussion ........................................................................................................... 23
Particle Tracking ...................................................................................................... 24
Needle ......................................................................................................................... 24
Summary ............................................................................................................ 26
Who is We? ........................................................................................................ 28
Citations ............................................................................................................. 30

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  • preliminary pages 4 committee members 040811
  • Table of Contents
  • Honors Thesis 2.4.3.pdf

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