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On the Development of Tools for the Study of Colloidal Self-Assembly
On the Development of Tools for the Study of Colloidal Self-Assembly
On the Development of Tools for the Study of Colloidal Self-Assembly

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자료유형  
 학위논문 서양
최종처리일시  
20250211152102
ISBN  
9798382739786
DDC  
660
저자명  
Butler, Brandon.
서명/저자  
On the Development of Tools for the Study of Colloidal Self-Assembly
발행사항  
[Sl] : University of Michigan, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
119 p
주기사항  
Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
주기사항  
Advisor: Glotzer, Sharon.
학위논문주기  
Thesis (Ph.D.)--University of Michigan, 2024.
초록/해제  
요약Self-assembly is the process by which a material organizes itself without the need for external stimuli. This process spans a broad range of phenomena, from the crystallization of solids from atoms and molecules to the formation of micelles and cell membranes by amphiphilic molecules to the organization of colloidal crystals from nanoparticles. Understanding these phase transitions is essential to the intelligent development of new materials and structures and in particular for controlling the thermodynamic and kinetic pathways for assembly. Enabling such control will allow for currently impossible to access phases, precision in defect sizes and amounts and control of other knobs of phase design at various length scales.In Chapter 1, we describe the phenomena and challenges to detailed investigation of assembly pathways that this dissertation addresses.In Chapter 2, we outline two methods used throughout the dissertation.In Chapter 3, we present a six-step pipeline and Python package, dupin, we developed for detecting events from particle trajectories. The detection of transitions in particle-based (e.g. molecular) simulations is typically handled in an ad hoc way, while dupin provides a generalized detection scheme that maintains interpretability and permits comparison among disparate systems and pathways. Furthermore, by automating the detection of events associated with phase transformations, dupin enables self-assembly studies at larger length and time scales than previously feasible by removing the operator from the data-processing loop. We conclude Chapter 3 with example applications of dupin to the study of self-assembly.In Chapter 4, we outline and discuss a new order parameter that quantifies the symmetry of local particle environments. During the formation of crystals, particles organize themselves locally into motifs with new symmetries that may or may not be present in the fluid or the final crystal structure. The "Point Group Order Parameter", PGOP, identifies the point group symmetry of an individual particle's local environment. By identifying these local motifs and how they change over time, we can learn how a fluid chooses a particular kinetic pathway to follow. We compare PGOP to other commonly used local order parameters and, through examples, show how it provides a useful level of description not accessible to other order parameters. The chapter begins with an outline of the algorithm that is quickly followed by various demonstrations of PGOP's ability to detect and quantify local order in noisy crystalline systems with/without defects and even amorphous phases.In Chapter 5, we present another new order parameter we developed for studying phase transformations. This new order parameter consists of a group of functions that form a vector of continuous local coordination numbers, CNv , in a system of particles. The well-known local coordination number, CN, is defined for particle-based systems as the number of particles that are first nearest neighbors to a given particle. Consequently, CN takes on only discrete integer values, which can be problematic when used as a local order parameter due to fluctuations from thermal effects. CNv smooths CN into a continuous value - essentially a dimensionless local density - making it useful in self-assembly studies in which thermal noise and other forces can cause discontinuous changes in CN. To do this, CNv uses the area of facets in Voronoi tessellation polytopes to weigh neighbor contributions to a coordination shell. We provide a detailed description of CNv and demonstrate its usefulness in noisy systems and in combination with PGOP.In Chapter 6, we discuss our software development contributions to HOOMD-blue, our group's open source Python simulation toolkit, for its version 3 release. This release included a complete redesign of the application programming interface, various ways to extend molecular dynamics and Monte Carlo simulations of particle-based systems in Python and direct access to HOOMD-blue's internal data buffers. These advancements facilitated numerous new simulation protocols and methodologies while reducing the human capital necessary for the design of new simulation techniques.We conclude my dissertation in Chapter 7 with a summary of the preceding chapters and provide a forward-looking perspective regarding further work and the potential new applications of our work in the field of self-assembly.
일반주제명  
Chemical engineering
일반주제명  
Applied physics
일반주제명  
Condensed matter physics
키워드  
Colloids
키워드  
Self-assembly
키워드  
Order parameters
키워드  
Software development
키워드  
Bond orientational ordering
키워드  
Change point detection
기타저자  
University of Michigan Chemical Engineering
기본자료저록  
Dissertations Abstracts International. 85-12B.
전자적 위치 및 접속  
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MARC

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■1001  ▼aButler,  Brandon.
■24510▼aOn  the  Development  of  Tools  for  the  Study  of  Colloidal  Self-Assembly
■260    ▼a[Sl]▼bUniversity  of  Michigan▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a119  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-12,  Section:  B.
■500    ▼aAdvisor:  Glotzer,  Sharon.
■5021  ▼aThesis  (Ph.D.)--University  of  Michigan,  2024.
■520    ▼aSelf-assembly  is  the  process  by  which  a  material  organizes  itself  without  the  need  for  external  stimuli.  This  process  spans  a  broad  range  of  phenomena,  from  the  crystallization  of  solids  from  atoms  and  molecules  to  the  formation  of  micelles  and  cell  membranes  by  amphiphilic  molecules  to  the  organization  of  colloidal  crystals  from  nanoparticles.  Understanding  these  phase  transitions  is  essential  to  the  intelligent  development  of  new  materials  and  structures  and  in  particular  for  controlling  the  thermodynamic  and  kinetic  pathways  for  assembly.  Enabling  such  control  will  allow  for  currently  impossible  to  access  phases,  precision  in  defect  sizes  and  amounts  and  control  of  other  knobs  of  phase  design  at  various  length  scales.In  Chapter  1,  we  describe  the  phenomena  and  challenges  to  detailed  investigation  of  assembly  pathways  that  this  dissertation  addresses.In  Chapter  2,  we  outline  two  methods  used  throughout  the  dissertation.In  Chapter  3,  we  present  a  six-step  pipeline  and  Python  package,  dupin,  we  developed  for  detecting  events  from  particle  trajectories.  The  detection  of  transitions  in  particle-based  (e.g.  molecular)  simulations  is  typically  handled  in  an  ad  hoc  way,  while  dupin  provides  a  generalized  detection  scheme  that  maintains  interpretability  and  permits  comparison  among  disparate  systems  and  pathways.  Furthermore,  by  automating  the  detection  of  events  associated  with  phase  transformations,  dupin  enables  self-assembly  studies  at  larger  length  and  time  scales  than  previously  feasible  by  removing  the  operator  from  the  data-processing  loop.  We  conclude  Chapter  3  with  example  applications  of  dupin  to  the  study  of  self-assembly.In  Chapter  4,  we  outline  and  discuss  a  new  order  parameter  that  quantifies  the  symmetry  of  local  particle  environments.  During  the  formation  of  crystals,  particles  organize  themselves  locally  into  motifs  with  new  symmetries  that  may  or  may  not  be  present  in  the  fluid  or  the  final  crystal  structure.  The  "Point  Group  Order  Parameter",  PGOP,  identifies  the  point  group  symmetry  of  an  individual  particle's  local  environment.  By  identifying  these  local  motifs  and  how  they  change  over  time,  we  can  learn  how  a  fluid  chooses  a  particular  kinetic  pathway  to  follow.  We  compare  PGOP  to  other  commonly  used  local  order  parameters  and,  through  examples,  show  how  it  provides  a  useful  level  of  description  not  accessible  to  other  order  parameters.  The  chapter  begins  with  an  outline  of  the  algorithm  that  is  quickly  followed  by  various  demonstrations  of  PGOP's  ability  to  detect  and  quantify  local  order  in  noisy  crystalline  systems  with/without  defects  and  even  amorphous  phases.In  Chapter  5,  we  present  another  new  order  parameter  we  developed  for  studying  phase  transformations.  This  new  order  parameter  consists  of  a  group  of  functions  that  form  a  vector  of  continuous  local  coordination  numbers,  CNv  ,  in  a  system  of  particles.  The  well-known  local  coordination  number,  CN,  is  defined  for  particle-based  systems  as  the  number  of  particles  that  are  first  nearest  neighbors  to  a  given  particle.  Consequently,  CN  takes  on  only  discrete  integer  values,  which  can  be  problematic  when  used  as  a  local  order  parameter  due  to  fluctuations  from  thermal  effects.  CNv  smooths  CN  into  a  continuous  value  -  essentially  a  dimensionless  local  density  -  making  it  useful  in  self-assembly  studies  in  which  thermal  noise  and  other  forces  can  cause  discontinuous  changes  in  CN.  To  do  this,  CNv  uses  the  area  of  facets  in  Voronoi  tessellation  polytopes  to  weigh  neighbor  contributions  to  a  coordination  shell.  We  provide  a  detailed  description  of  CNv  and  demonstrate  its  usefulness  in  noisy  systems  and  in  combination  with  PGOP.In  Chapter  6,  we  discuss  our  software  development  contributions  to  HOOMD-blue,  our  group's  open  source  Python  simulation  toolkit,  for  its  version  3  release.  This  release  included  a  complete  redesign  of  the  application  programming  interface,  various  ways  to  extend  molecular  dynamics  and  Monte  Carlo  simulations  of  particle-based  systems  in  Python  and  direct  access  to  HOOMD-blue's  internal  data  buffers.  These  advancements  facilitated  numerous  new  simulation  protocols  and  methodologies  while  reducing  the  human  capital  necessary  for  the  design  of  new  simulation  techniques.We  conclude  my  dissertation  in  Chapter  7  with  a  summary  of  the  preceding  chapters  and  provide  a  forward-looking  perspective  regarding  further  work  and  the  potential  new  applications  of  our  work  in  the  field  of  self-assembly.
■590    ▼aSchool  code:  0127.
■650  4▼aChemical  engineering
■650  4▼aApplied  physics
■650  4▼aCondensed  matter  physics
■653    ▼aColloids
■653    ▼aSelf-assembly
■653    ▼aOrder  parameters
■653    ▼aSoftware  development
■653    ▼aBond  orientational  ordering
■653    ▼aChange  point  detection
■690    ▼a0542
■690    ▼a0215
■690    ▼a0611
■71020▼aUniversity  of  Michigan▼bChemical  Engineering.
■7730  ▼tDissertations  Abstracts  International▼g85-12B.
■790    ▼a0127
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17162843▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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