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Student Number 952202035
Author Chia-wei Yang(·¨®a޳)
Author's Email Address ntravel721021@hotmail.com
Statistics This thesis had been viewed 939 times. Download 534 times.
Department Physics
Year 2008
Semester 2
Degree Master
Type of Document Master's Thesis
Language English
Title Diffusiophoresis of Polystyrene Spheres in Electrolyte Solutions
Date of Defense 2009-06-10
Page Count 46
Keyword
  • colloid
  • concentration gradient
  • diffusiophoresis
  • Abstract In this thesis we investigate dynamical properties of 1 micrometer colloids placed in a narrow channel which is filled with a sodium chlorine solution and a glucose solution with a concentration gradient. Our device contains two reservoirs: one contains a NaCl solution, and the other is pure water. They are connected by a narrow channel of 60 micrometer depth and 0.5 mm in width. Because of the different NaCl/glucose concentration in the reservoirs, the ions of NaCl and molecules of glucose would diffuse from the high concentration reservoir to the low-concentration one, and a concentration gradient set up. By recording the motion of colloids under a microscopic, we study the colloids random motion and average flux induced by concentration of the NaCl. However, we find the the direction of the migration of the colloids in the NaCl solution are very different to be compared in the glucose solution. The colloids in the NaCl solution move from the higher concentration to the lower one, and the opposite direction occur in the glucose solution. We find that the velocity of colloid is proportional to square root of concentration in dilute region which is consistent with the derivation of the relation between the concentrations and the velocities in dilute concentration based on Debye-Huckel theory. Furthermore, we compare the experimental result with the theory proposed by Deryagin and co-workers, the surface charges increase with the concentration of the electrolyte solutes increasing.
    Table of Content 1 Introduction 1
    2 Theory 7
    2.1 Mean Free Path . . . . . . . . . . . . . . . . . . . . . . . . . . 7
    2.2 Debye-Huckel theory . . . . . . . . . . . . . . . . . . . . . . . 8
    2.3 Theory of Deryagin, Dukhin, and Korotkova . . . . . . . . . . 12
    3 Apparatus and experiment 14
    3.1 Preparation of the samples and devices . . . . . . . . . . . . . 14
    3.2 Experiment Details . . . . . . . . . . . . . . . . . . . . . . . . 17
    3.3 The measurement of the experiment . . . . . . . . . . . . . . 18
    4 Result and Discussion 25
    4.1 The colloid inverse migration caused by ionization of solutions 25
    4.2 Diffusion constants under various concentrations of Nacl . . . 27
    4.3 The effect of various concentration of NaCl . . . . . . . . . . 31
    4.4 Discussion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
    5 Conclusion 43
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    Advisor
  • Peilong Chen(³¯°ö«G)
  • Files
  • 952202035.pdf
  • approve immediately
    Date of Submission 2009-07-25

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