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Processing Approaches to Realize Electrically Conductive Surface-Localized Nanocomposites
Processing Approaches to Realize Electrically Conductive Surface-Localized Nanocomposites
Processing Approaches to Realize Electrically Conductive Surface-Localized Nanocomposites

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자료유형  
 학위논문 서양
최종처리일시  
20260202105329
ISBN  
9798263324858
DDC  
363.25
저자명  
Ryan, Emily A.
서명/저자  
Processing Approaches to Realize Electrically Conductive Surface-Localized Nanocomposites
발행사항  
[Sl] : Georgia Institute of Technology, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
290 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-05, Section: B.
주기사항  
Advisor: Shofner, Meisha L.;Reynolds, John R.
학위논문주기  
Thesis (Ph.D.)--Georgia Institute of Technology, 2025.
초록/해제  
요약The development of physically robust, environmentally stable, electrically conductive polymer films is critical for a wide range of future space exploration applications, including inflatable habitats and flexible robotics. In this work, melt infiltration was explored as a method to produce polymer films with integrated, thick, and durable surface-localized nanocomposite (SLNC) coatings with nanoparticle loadings well beyond the percolation threshold. A generalized method for identifying melt infiltration temperatures in semicrystalline substrates, based on their melting regime, was developed. This approach was used to produce electrically conductive SLNCs from reduced graphene oxide (rGO) nanoparticles and a variety of semi-crystalline polymer substrates. By varying the infiltration temperature within the melt regime controllable levels of infiltration and related surface roughness and porosity were demonstrated. Thermal analysis modeling of the infiltration procedure also revealed that infiltration proceeded through mixed solid-liquid flow due to the partially melted state of the infiltrating matrix in contrast to the fully liquid infiltration observed in amorphous polymer systems.To investigate the influence of particle chemistry on infiltration dynamics and SLNC properties, a post-reduction method was developed to synthesize fluoro-alkyl functionalization of rGO (rGO-f). Despite a low degree of functionalization (~0.1 at.% F), rGO-f exhibited significant changes in surface energy and dispersion behavior, compared to unfunctionalized rGO, while maintaining a high level of conductivity. The infiltration behavior was compared across rGO-f, unfunctionalized rGO, and a previously developed alkyl functionalized rGO (rGO-dd). Functionalization had a minimal impact on infiltration progression or SLNC conductivity. Mechanical reinforcement of the SLNCs was found to depend on compatibility between the rGO functionality and the infiltrating matrix with rGO-dd/polyethylene SLNCs showing higher reinforcement (140% increase in modulus), than rGO-f/polyethylene SLNCs (64% increase).The piezoresistive behavior of fully infiltrated SLNCs was characterized under quasi-static and cyclic tension to understand the origin of piezoresistivity in these SLNCs. Creep-driven network reconfiguration governed the low-strain response, while crack formation dominated at higher strains. To assess durability in potential wear conditions, the conductivity of SLNCs was track during film bending and abrasion with lunar dust simulant. Fully infiltrated SLNCs maintained sufficient conductivity at 1000 cycles of lunar simulant abrasion and at sharp bend radii, indicating robustness to mechanical deformation and wear.Finally, SLNCs were integrated into a planar electrodynamic dust shield (EDS) architecture by adapting the particle deposition and infiltration process to produce patterned devices. These EDS devices effectively removed lunar dust simulant in high vacuum conditions. Altogether, this work established a generalized processing approach for SLNCs in semi-crystalline materials and demonstrated key attributes for their use as multifunctional surface coatings in space-relevant environments.
일반주제명  
Investigations
일반주제명  
Nanocomposites
일반주제명  
Nanoparticles
일반주제명  
Dust
일반주제명  
Polymer films
일반주제명  
Fluorides
일반주제명  
Cracks
일반주제명  
Graphene
일반주제명  
Contact angle
일반주제명  
Composite materials
일반주제명  
Nanotubes
일반주제명  
Polymers
일반주제명  
Polyethylene
일반주제명  
Space exploration
일반주제명  
Fourier transforms
일반주제명  
Solvents
일반주제명  
Computer aided design--CAD
일반주제명  
Microscopy
일반주제명  
Chemical vapor deposition
일반주제명  
High density polyethylenes
일반주제명  
Electrostatic discharges
일반주제명  
Aerospace engineering
일반주제명  
Industrial engineering
일반주제명  
Materials science
일반주제명  
Mathematics
일반주제명  
Nanotechnology
일반주제명  
Polymer chemistry
기타저자  
Georgia Institute of Technology.
기본자료저록  
Dissertations Abstracts International. 87-05B.
전자적 위치 및 접속  
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MARC

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■020    ▼a9798263324858
■035    ▼a(MiAaPQ)AAI32307928
■035    ▼a(MiAaPQ)GeorgiaTech78713
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a363.25
■1001  ▼aRyan,  Emily  A.
■24510▼aProcessing  Approaches  to  Realize  Electrically  Conductive  Surface-Localized  Nanocomposites
■260    ▼a[Sl]▼bGeorgia  Institute  of  Technology▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a290  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-05,  Section:  B.
■500    ▼aAdvisor:  Shofner,  Meisha  L.;Reynolds,  John  R.
■5021  ▼aThesis  (Ph.D.)--Georgia  Institute  of  Technology,  2025.
■520    ▼aThe  development  of  physically  robust,  environmentally  stable,  electrically  conductive  polymer  films  is  critical  for  a  wide  range  of  future  space  exploration  applications,  including  inflatable  habitats  and  flexible  robotics.  In  this  work,  melt  infiltration  was  explored  as  a  method  to  produce  polymer  films  with  integrated,  thick,  and  durable  surface-localized  nanocomposite  (SLNC)  coatings  with  nanoparticle  loadings  well  beyond  the  percolation  threshold.  A  generalized  method  for  identifying  melt  infiltration  temperatures  in  semicrystalline  substrates,  based  on  their  melting  regime,  was  developed.  This  approach  was  used  to  produce  electrically  conductive  SLNCs  from  reduced  graphene  oxide  (rGO)  nanoparticles  and  a  variety  of  semi-crystalline  polymer  substrates.  By  varying  the  infiltration  temperature  within  the  melt  regime  controllable  levels  of  infiltration  and  related  surface  roughness  and  porosity  were  demonstrated.  Thermal  analysis  modeling  of  the  infiltration  procedure  also  revealed  that  infiltration  proceeded  through  mixed  solid-liquid  flow  due  to  the  partially  melted  state  of  the  infiltrating  matrix  in  contrast  to  the  fully  liquid  infiltration  observed  in  amorphous  polymer  systems.To  investigate  the  influence  of  particle  chemistry  on  infiltration  dynamics  and  SLNC  properties,  a  post-reduction  method  was  developed  to  synthesize  fluoro-alkyl  functionalization  of  rGO  (rGO-f).  Despite  a  low  degree  of  functionalization  (~0.1  at.%  F),  rGO-f  exhibited  significant  changes  in  surface  energy  and  dispersion  behavior,  compared  to  unfunctionalized  rGO,  while  maintaining  a  high  level  of  conductivity.  The  infiltration  behavior  was  compared  across  rGO-f,  unfunctionalized  rGO,  and  a  previously  developed  alkyl  functionalized  rGO  (rGO-dd).  Functionalization  had  a  minimal  impact  on  infiltration  progression  or  SLNC  conductivity.  Mechanical  reinforcement  of  the  SLNCs  was  found  to  depend  on  compatibility  between  the  rGO  functionality  and  the  infiltrating  matrix  with  rGO-dd/polyethylene  SLNCs  showing  higher  reinforcement  (140%  increase  in  modulus),  than  rGO-f/polyethylene  SLNCs  (64%  increase).The  piezoresistive  behavior  of  fully  infiltrated  SLNCs  was  characterized  under  quasi-static  and  cyclic  tension  to  understand  the  origin  of  piezoresistivity  in  these  SLNCs.  Creep-driven  network  reconfiguration  governed  the  low-strain  response,  while  crack  formation  dominated  at  higher  strains.  To  assess  durability  in  potential  wear  conditions,  the  conductivity  of  SLNCs  was  track  during  film  bending  and  abrasion  with  lunar  dust  simulant.  Fully  infiltrated  SLNCs  maintained  sufficient  conductivity  at  1000  cycles  of  lunar  simulant  abrasion  and  at  sharp  bend  radii,  indicating  robustness  to  mechanical  deformation  and  wear.Finally,  SLNCs  were  integrated  into  a  planar  electrodynamic  dust  shield  (EDS)  architecture  by  adapting  the  particle  deposition  and  infiltration  process  to  produce  patterned  devices.  These  EDS  devices  effectively  removed  lunar  dust  simulant  in  high  vacuum  conditions.  Altogether,  this  work  established  a  generalized  processing  approach  for  SLNCs  in  semi-crystalline  materials  and  demonstrated  key  attributes  for  their  use  as  multifunctional  surface  coatings  in  space-relevant  environments.
■590    ▼aSchool  code:  0078.
■650  4▼aInvestigations
■650  4▼aNanocomposites
■650  4▼aNanoparticles
■650  4▼aDust
■650  4▼aPolymer  films
■650  4▼aFluorides
■650  4▼aCracks
■650  4▼aGraphene
■650  4▼aContact  angle
■650  4▼aComposite  materials
■650  4▼aNanotubes
■650  4▼aPolymers
■650  4▼aPolyethylene
■650  4▼aSpace  exploration
■650  4▼aFourier  transforms
■650  4▼aSolvents
■650  4▼aComputer  aided  design--CAD
■650  4▼aMicroscopy
■650  4▼aChemical  vapor  deposition
■650  4▼aHigh  density  polyethylenes
■650  4▼aElectrostatic  discharges
■650  4▼aAerospace  engineering
■650  4▼aIndustrial  engineering
■650  4▼aMaterials  science
■650  4▼aMathematics
■650  4▼aNanotechnology
■650  4▼aPolymer  chemistry
■690    ▼a0538
■690    ▼a0546
■690    ▼a0794
■690    ▼a0405
■690    ▼a0652
■690    ▼a0495
■71020▼aGeorgia  Institute  of  Technology.
■7730  ▼tDissertations  Abstracts  International▼g87-05B.
■790    ▼a0078
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360258▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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