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Molecular Diffusive Dynamics in Complex Liquids

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Molecular Diffusive Dynamics in Complex Liquids This document is downloaded from Outstanding Academic Papers by Students (OAPS), Run Run Shaw Library, City University of Hong Kong. Title Molecular diffusive dynamics in complex liquids Author(s) Tsang, Yuk Wai (曾郁惠) Tsang, Y. W. (2018). Molecular diffusive dynamics in complex liquids Citation (Outstanding Academic Papers by Students (OAPS), City University of Hong Kong). Issue Date 2018 URL http://dspace.cityu.edu.hk/handle/2031/9126 This work is protected by copyright. Reproduction or distribution of Rights the work in any format is prohibited without written permission of the copyright owner. Access is unrestricted. CITY UNIVERSITY OF HONG KONG DEPARTMENT OF PHYSICS AND MATERIALS SCIENCE BACHELOR OF SCIENCE (HONS) IN APPLIED PHYSICS 2017-2018 DISSERTATION Molecular diffusive dynamics in complex liquids by TSANG Yuk Wai April 2018 ____________________________________________________________________________________________________________________________________________________ This document is downloaded from Outstanding Academic Papers by Students (OAPS), Run Run Shaw Library, City University of Hong Kong. Molecular diffusive dynamics in complex liquids by TSANG Yuk Wai Submitted in partial fulfilment of the requirements for the degree of BACHELOR OF SCIENCE (HONS) IN APPLIED PHYSICS from City University of Hong Kong April 2018 Project Supervisor : Dr. Mavila C Suresh ii ____________________________________________________________________________________________________________________________________________________ This document is downloaded from Outstanding Academic Papers by Students (OAPS), Run Run Shaw Library, City University of Hong Kong. Table of Contents List of Figures ................................................................................................................................... v List of tables .................................................................................................................................... vi List of equations...............................................................................................................................vii Acknowledgement ............................................................................................................................ 1 Abstract ............................................................................................................................................ 2 1. Introduction ................................................................................................................................... 3 2. Objective ....................................................................................................................................... 5 3. Literature Review .......................................................................................................................... 6 3.1. Dynamics in Liquids ............................................................................................................... 6 3.2. Glass-Forming Liquids............................................................................................................ 6 3.2.1. Salol (Phenyl Salicylate) .................................................................................................. 7 3.2.2. Acetone ........................................................................................................................... 8 3.3. Other Studies ......................................................................................................................... 8 3.5.1. Study of Dendrimers ........................................................................................................ 8 3.5.2. Study of Colloidal Microgels ............................................................................................. 9 4. Dynamic Light Scattering ............................................................................................................ 10 4.1. Three Components of DLS ................................................................................................... 10 4.1.1. LASER ........................................................................................................................... 11 4.1.2. Sample Container .......................................................................................................... 12 4.1.3. Light Detector ................................................................................................................ 12 4.2. Experimentation ................................................................................................................... 13 5. Dynamics of Salol in Acetone ..................................................................................................... 15 5.1 Sample Preparation ............................................................................................................... 15 5.1.1. Molecular Weight of the Samples ................................................................................... 15 5.1.2. 10:1 Sample ................................................................................................................... 16 iii ____________________________________________________________________________________________________________________________________________________ This document is downloaded from Outstanding Academic Papers by Students (OAPS), Run Run Shaw Library, City University of Hong Kong. 5.1.3. 20:1 Sample ................................................................................................................... 16 5.1.4. Pure Salol ...................................................................................................................... 16 5.2. X-ray Diffraction Study.......................................................................................................... 17 5.2.1. Parameters .................................................................................................................... 18 5.3 Dynamic Light Scattering Experiment .................................................................................... 19 5.4. Data Analysis of DLS............................................................................................................ 20 5.4.1. Relaxation Time 흉 from Linux ....................................................................................... 20 5.4.3. Wave Vector q ............................................................................................................... 22 5.4.4. Origin 8 .......................................................................................................................... 22 5.4.5. Diffusion Coefficient D ................................................................................................... 24 6. Results and Discussion ............................................................................................................... 25 6.1 Results from X-ray Diffraction ................................................................................................ 25 6.2. Results of DLS Experiments ................................................................................................. 27 6.2.1. 1/τ VS q2 ........................................................................................................................ 27 6.2.2. lnD VS 1000/T ............................................................................................................... 32 7. Limitations .................................................................................................................................. 37 8. Improvements ............................................................................................................................. 38 9. Recommendations ...................................................................................................................... 39 10. Conclusion ................................................................................................................................ 40 References ..................................................................................................................................... 41 iv ____________________________________________________________________________________________________________________________________________________ This document is downloaded from Outstanding Academic Papers by Students (OAPS), Run Run Shaw Library, City University of Hong Kong. List of Figures Figure 1. Two-time relaxation process of materials .............................................................................. 4 Figure 2. Esterification of salicylic acid and phenol to produce salol (Sharma & Rani, 2015) ............ 7 Figure 3. The chemical structure of phenyl salicylate (SIGMA-ALDRICH, n.d.) ............................... 7 Figure 4. The chemical structure of acetone (BIOMEDICALS, n.d.) ................................................... 8 Figure 5. A phase diagram showing the concentration dependence phase separation temperature of PNIPAM ................................................................................................................................................ 9 Figure 6. The model of Photon Correlation Spectrometer ................................................................... 10 Figure 7. Real DLS setup ..................................................................................................................... 11 Figure 8. The illustration of scattered
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