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Nanomechanical and Molecular Studies via Advanced Atomic Force Microscopy Techniques
Nanomechanical and Molecular Studies via Advanced Atomic Force Microscopy Techniques
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202103032
- ISBN
- 9798286441983
- DDC
- 620.11
- 저자명
- Wang, Xinzhe.
- 서명/저자
- Nanomechanical and Molecular Studies via Advanced Atomic Force Microscopy Techniques
- 발행사항
- [Sl] : Yale University, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 143 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
- 주기사항
- Advisor: Schwarz, Udo D.
- 학위논문주기
- Thesis (Ph.D.)--Yale University, 2025.
- 초록/해제
- 요약This thesis explores the application of advanced atomic force microscopy (AFM) techniques to investigate the nanomechanical properties of bulk metallic glasses (BMGs) and the molecular characteristics of cobalt phthalocyanine (CoPc) molecules. By bridging materials science and molecular chemistry, the research contributes to understanding mechanical behavior in disordered materials and the catalytic potential of molecular systems for sustainable energy applications.In the first part, a commercial ambient AFM was employed to study the nanomechanical properties of platinum-based BMGs. Through nanoindentation experiments, stiffness distribution maps were generated from indentation force curves, providing insights into the structural homogeneity of BMGs prepared at varying fictive temperatures. These findings elucidate the relationship between thermal history and mechanical properties, offering pathways for optimizing BMGs for practical applications.The second part focuses on the molecular investigation of CoPc, a molecule with significant catalytic potential for CO2 reduction to liquid fuels such as methanol. Using a home-built tuning fork-based AFM under ultra-high vacuum and cryogenic conditions, several studies were conducted. A novel CO-functionalized tip enabled the visualization of CoPc's inner structure and the extraction of chemical information through 3D-AFM techniques. Further investigations revealed the rotational behavior of t-butyl groups in substituted CoPc when interacting with CO, highlighting their impact on catalytic efficiency. Finally, NH2-substituted CoPc molecules were analyzed to isolate interaction forces between CO and the molecule, excluding substrate and tip contributions. A comparative study with unsubstituted CoPc revealed the influence of NH2 ligands on binding strength and molecular properties.This work advances the use of AFM in probing nanomechanical and molecular interactions, providing a deeper understanding of material homogeneity in BMGs and the catalytic mechanisms of CoPc. The methodologies and findings presented here have implications for designing next-generation materials and catalysts, contributing to the fields of materials science and sustainable energy research.
- 일반주제명
- Materials science
- 일반주제명
- Engineering
- 일반주제명
- Nanotechnology
- 기타저자
- Yale University Mechanical Engineering and Materials Science
- 기본자료저록
- Dissertations Abstracts International. 86-12B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202103032
■006m o d
■007cr#unu||||||||
■020 ▼a9798286441983
■035 ▼a(MiAaPQ)AAI31845977
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a620.11
■1001 ▼aWang, Xinzhe.
■24510▼aNanomechanical and Molecular Studies via Advanced Atomic Force Microscopy Techniques
■260 ▼a[Sl]▼bYale University▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a143 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-12, Section: B.
■500 ▼aAdvisor: Schwarz, Udo D.
■5021 ▼aThesis (Ph.D.)--Yale University, 2025.
■520 ▼aThis thesis explores the application of advanced atomic force microscopy (AFM) techniques to investigate the nanomechanical properties of bulk metallic glasses (BMGs) and the molecular characteristics of cobalt phthalocyanine (CoPc) molecules. By bridging materials science and molecular chemistry, the research contributes to understanding mechanical behavior in disordered materials and the catalytic potential of molecular systems for sustainable energy applications.In the first part, a commercial ambient AFM was employed to study the nanomechanical properties of platinum-based BMGs. Through nanoindentation experiments, stiffness distribution maps were generated from indentation force curves, providing insights into the structural homogeneity of BMGs prepared at varying fictive temperatures. These findings elucidate the relationship between thermal history and mechanical properties, offering pathways for optimizing BMGs for practical applications.The second part focuses on the molecular investigation of CoPc, a molecule with significant catalytic potential for CO2 reduction to liquid fuels such as methanol. Using a home-built tuning fork-based AFM under ultra-high vacuum and cryogenic conditions, several studies were conducted. A novel CO-functionalized tip enabled the visualization of CoPc's inner structure and the extraction of chemical information through 3D-AFM techniques. Further investigations revealed the rotational behavior of t-butyl groups in substituted CoPc when interacting with CO, highlighting their impact on catalytic efficiency. Finally, NH2-substituted CoPc molecules were analyzed to isolate interaction forces between CO and the molecule, excluding substrate and tip contributions. A comparative study with unsubstituted CoPc revealed the influence of NH2 ligands on binding strength and molecular properties.This work advances the use of AFM in probing nanomechanical and molecular interactions, providing a deeper understanding of material homogeneity in BMGs and the catalytic mechanisms of CoPc. The methodologies and findings presented here have implications for designing next-generation materials and catalysts, contributing to the fields of materials science and sustainable energy research.
■590 ▼aSchool code: 0265.
■650 4▼aMaterials science
■650 4▼aEngineering
■650 4▼aNanotechnology
■653 ▼aCobalt phthalocyanine
■653 ▼aNanomechanical properties
■653 ▼aAtomic force microscopy
■653 ▼aCatalytic mechanisms
■690 ▼a0794
■690 ▼a0652
■690 ▼a0537
■71020▼aYale University▼bMechanical Engineering and Materials Science.
■7730 ▼tDissertations Abstracts International▼g86-12B.
■790 ▼a0265
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17356772▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


