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論文名稱(外文):Paper Porosity Measurement by Electric Current
指導教授(外文):Ruey-Jen Yang
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In this research, we measured the electric current in a paper channel to estimate the porosity of paper. When ions flow in a paper channel, the fibers in the paper obstruct the flow. Therefore, channels with fibers have lower flux and lower current because the volumetric flow rate in a paper channel with fibers is lower than that of a hollow channel (without fibers). Based on this concept, we conducted the following study. In order to reduce the evaporation effect and create the same channel surface, we used two pieces of polydimethylsiloxane (PDMS) to sandwich the paper channel and fixed them together with double-sided tape. In addition, we changed the applied voltage, solution, and the size of the channels to analyze the experimental results under different conditions. It was found from the experimental results that the measured porosity of the paper wasn’t changed significantly at different applied voltages. Therefore, this method can be carried out at a low voltage. Similar results can be obtained using potassium chloride (KCl) and sodium chloride (NaCl) to measure the porosity of paper. This infers that a strong electrolyte can be used in this method. Changing the size of the channels didn’t affect the experiment results, so a lower volume of paper can be used to measure porosity. This research offers a new method to measure the porosity of paper. This method can serve as a reference when choosing the material for use in microfluidic paper-based devices (μPADs).
Abstract I
摘要 II
誌謝 III
List of Figures VI
List of Tables XI
Abbreviation XII
Nomenclature XIII
Greeks XIV
Chapter 1 Introduction 1
1-1 Introduction 1
1-2 Literature Survey 3
Chapter 2 Principles 9
2-1 Porosity 9
2-2 Electrical Double Layers 10
2-3 Electroosmotic Flow (EOF) 12
2-4 Current and Porosity 13
Chapter 3 Materials and Methods 15
3-1 Materials and Reagents 15
3-2 Instrument and Software 15
3-3 Device Fabrication 18
3-4 Device Design 20
3-5 Experiment Setup 22
Chapter 4 Results and Discussion 26
4-1 Pore Volume Fraction 26
4-2 Weighing Method 27
4-3 Channel Surface Effect 28
4-4 Porosity Measurement 31
4-5 Porosity Measurement with the Different Solution 36
4-6 Porosity Measurement with the Different Size of Channels 38
Chapter 5 Conclusion 41
References 42

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