Quantitative Analysis of Diffusion and Chemical Reaction in
Pressure-Driven Microfluidic Channels


TABLE OF CONTENTS

Chapter 1: Background of Microfluidics
1.1    Types of Fluid Actuation
1.1.1 Devices using Pressure-Driven Flow
1.1.1.1 Flow Injection Analysis
1.1.1.2 Field-Flow Fractionation
1.1.1.3 The T-sensor
1.1.2 Devices using Electrokinetic Pumping
1.2    Materials
1.2.1 Silicon and Glass
1.2.2 Plastics
1.2.3 Elastomer
1.3    Major Microfluidic Applications
1.3.1 Sample Preparation and Handling
1.3.2 Chemical and Biological Detection
1.3.3 Proteomics
1.3.4 DNA Microarrays
1.3.5 Microreactors
1.4 Quantification Methods in the T-sensor

Chapter 2: Experimental Setup

2.1 Device Fabrication
2.2 Fluid Handling
2.3 Microscopy and Data Collection
2.4 Data Analysis

Chapter 3: Custom-coded Mathematical Models

3.1 Scope of Models
3.2 One-dimensional Model
3.3 Two-dimensional Model
3.4 Model Validation
3.5 Comparison of One- and Two-dimensional Models
3.6 Comments on Flow Development and Entry Length

Chapter 4: Microfluidic Assay for Human Serum Albumin

4.1 Statement of Purpose and Goals
4.2 Characterization of Molecular System
4.3 Experimental Protocol
4.4 Results and Discussion
4.5 Conclusions

Chapter 5: Theoretical Studies on Molecular Diffusion

5.1 Statement of Purpose
5.2 Methods
5.2.1 Studies on Accuracy of Diffusion Coefficient Measurement
5.2.2 Studies on Diffusive Scaling Laws
5.3 Results
5.3 1 Analysis of Accuracy of Diffusion Coefficient Measurement
5.3.2 Analysis of Studies on Diffusive Scaling Laws
5.4 Implications on Experimental Studies

Chapter 6: Diffusion Coefficient Measurements

6.1 Statement of Purpose
6.2 Experimental Protocol
6.3 Results and Discussion
6.4 Conclusions

Chapter 7: An Enzyme-based Microfluidic Assay

7.1 Statement of Purpose
7.2 Range of Potential Assays
7.3 Characterization of Molecular System
7.4 Experimental Protocol
7.5 Data Collection and Analysis
7.6 Results and Discussion
7.7 Conclusions

Chapter 8: Summary of Other Work

8.1 Diffusion Immunoassay
8.2 A Ferrofluidic Magnetic Micropump
8.3 Photobleaching in Microchannels
8.4 Sedimentation in Microchannels
8.5 Absorption-enhanced Field Flow Fractionation

List of References


Appendix A:
Quantitative Analysis of Molecular Interaction in a Microfluidic Channel: The T-sensor
Appendix B:
Theoretical Analysis of Molecular Diffusion in Pressure-Driven Laminar Flow in Microfluidic Channels
Appendix C: Optical Measurement of Transverse Molecular Diffusion in a Microchannel
Appendix D: Theoretical Analysis of Diffusive Scaling Laws in a Pressure-Driven Microfluidic Channel
Appendix E: Modeling an Enzyme Reaction in the T-sensor
Appendix F: A Rapid Diffusion Immunoassay in a T-Sensor
Appendix G:
A Ferrofluidic Magnetic Micropump
Appendix H: Code for One-dimensional model
Appendix I: Flow Chart for Two-dimensional Model


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