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Effect of Electric Field on Condensed-Phase Molecular Systems : 응집계 분자 환경에서 전기장 효과 연구
DC Field | Value | Language |
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dc.contributor.advisor | 강헌 | - |
dc.contributor.author | 신성환 | - |
dc.date.accessioned | 2017-10-27T17:16:02Z | - |
dc.date.available | 2017-10-27T17:16:02Z | - |
dc.date.issued | 2017-08 | - |
dc.identifier.other | 000000145458 | - |
dc.identifier.uri | https://hdl.handle.net/10371/137190 | - |
dc.description | 학위논문 (박사)-- 서울대학교 대학원 자연과학대학 화학부, 2017. 8. 강헌. | - |
dc.description.abstract | In this dissertation, I studied the effect of electric field on a condensed-phase molecular system. Many experiments have been performed for the investigation of field-induced phenomena, but only a few experiments are available for well-defined experimental conditions with strong electric field. We invented the ice film capacitor method, which can apply strong electricfield across a frozen molecular film. The effect of the electric field was examined using this method.
Chapter I introduces various experimental methods that are currently used to study field-induced phenomena. The advantages of the ice film capacitor method over other existing technique are briefly mentioned. In chapter II, the experimental methods used for the study in this thesis are explained. The detailed procedure of the ice film capacitor method and the basic principle of reflection absorption IR spectroscopy are introduced. Instrumentation of the methods is also described. In chapter III, the conformational change of 1, 2-dichloroethane (DCE) is investigated under the external electric field. Reflection absorption infrared spectroscopy was used for monitoring the molecular changes such as gauche/trans conversion and the reorientation of gauche-DCE. Trans-DCE molecules converted to gauche-DCE under an external electric field, and this conversion led to the reorientation of gauche-DCE along the electric field. The field-induced changes were occurred at 50 - 90 K, but not at 8 K, indicating that both thermal and electrostatic energies are needed to induce the conformational changes in a frozen molecular film. In chapter IV, the field-induced dissociation of acetic acid (AA) is studied using the ice film capacitor method. The dissociation of acid was monitored by using infrared spectroscopy and the mechanism of field-induced acid dissociation was discussed. AA molecules were dissociated into acetate ions by the external electric field at an acid-base interface. The amount of field-induced dissociation depended on the direction of the applied electric field, which suggests that the reaction was aided by the reorientation of reagent molecules. The effect of molecular size was studied by comparing the results of formic acid and propionic acid with those obtained for AA. The dissociation of smaller acids was more enhanced, supporting our interpretation that field-induced dissociation occurred via molecular reorientation. | - |
dc.description.tableofcontents | Chapter I. Introduction 1
I-1. Experimental Methods for Studying the Electric Field Effect 2 I-2. Advantages of Ice Film Capacitor Method 3 Reference 5 Chapter Ⅱ. Method 6 Ⅱ-1. Ice Film Capacitor Method 6 Ⅱ-2. Reflection Absorption FT-IR Spectroscopy 11 Ⅱ-3. Instruments 16 Reference 19 Chapter III. Electric Field-Induced Conformational Changes of 1,2-Dichloroethane in Frozen Films 29 Abstract 29 III-1. Introduction 31 III-2. Experimental Methods 32 III-3. Results and Discussion 34 III-4. Summary 42 Reference 44 Chapter IV. Field-Induced Acid Dissociation at the Acid-Base Interface 51 Abstract 51 IV-1. Introduction 53 IV-2. Experimental Methods 54 IV-3. Results 57 IV-4. Discussion 61 IV-5. Conclusion 65 Reference 66 Supporting Information 76 List of Publications 83 Abstract in Korean (Korean) 85 | - |
dc.format | application/pdf | - |
dc.format.extent | 1708295 bytes | - |
dc.format.medium | application/pdf | - |
dc.language.iso | en | - |
dc.publisher | 서울대학교 대학원 | - |
dc.subject | electric field | - |
dc.subject | ice film capacitor | - |
dc.subject | surface charging | - |
dc.subject | molecular conformational change | - |
dc.subject | acid base chemistry | - |
dc.subject | molecular reorientation | - |
dc.subject | RAIRS | - |
dc.subject.ddc | 540 | - |
dc.title | Effect of Electric Field on Condensed-Phase Molecular Systems | - |
dc.title.alternative | 응집계 분자 환경에서 전기장 효과 연구 | - |
dc.type | Thesis | - |
dc.contributor.AlternativeAuthor | Sunghwan Shin | - |
dc.description.degree | Doctor | - |
dc.contributor.affiliation | 자연과학대학 화학부 | - |
dc.date.awarded | 2017-08 | - |
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