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Nanomechanical and Molecular Studies via Advanced Atomic Force Microscopy Techniques
Nanomechanical and Molecular Studies via Advanced Atomic Force Microscopy Techniques
Nanomechanical and Molecular Studies via Advanced Atomic Force Microscopy Techniques

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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
키워드  
Cobalt phthalocyanine
키워드  
Nanomechanical properties
키워드  
Atomic force microscopy
키워드  
Catalytic mechanisms
기타저자  
Yale University Mechanical Engineering and Materials Science
기본자료저록  
Dissertations Abstracts International. 86-12B.
전자적 위치 및 접속  
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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.

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