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Extraordinary Heat Transfer Within Nanomaterials and Between Nanostructures
Extraordinary Heat Transfer Within Nanomaterials and Between Nanostructures
Extraordinary Heat Transfer Within Nanomaterials and Between Nanostructures

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20250211151255
ISBN  
9798382610733
DDC  
621
저자명  
Luo, Xiao.
서명/저자  
Extraordinary Heat Transfer Within Nanomaterials and Between Nanostructures
발행사항  
[Sl] : Carnegie Mellon University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
168 p
주기사항  
Source: Dissertations Abstracts International, Volume: 85-11, Section: B.
주기사항  
Advisor: Shen, Sheng.
학위논문주기  
Thesis (Ph.D.)--Carnegie Mellon University, 2024.
초록/해제  
요약Nanoscale offers great promise for enhanced heat transfer and advanced thermal control by enabling novel material structures and promoting new mechanisms. This dissertation investigates the heat transfer behavior at the nanoscale of both the solid-based heat conduction and the media-less thermal radiation, and their applications in advanced thermal control, including thermal regulation and rectification. We first introduce the novel polyethylene (PE) nanofiber, which shows aligned molecular chains and suppressed intermolecular phonon scattering. We experimentally demonstrate that PE nanofiber is a thermal regulator by its intrinsic structural phase change. We further modify the nanofiber to realize thermal rectification through partial electron-beam irradiation. Then we explore the near-field thermal radiation between subwavelength dimensions. Near-field thermal radiation, the thermal radiation across subwavelength gap distances (generally nanoscale), has proven efficient in enhancing radiative heat transfer via evanescent waves. However, the influence of subwavelength dimensions on near-field thermal radiation remains unexplored, although it has proven non-trivial effect on far-field thermal radiation. To address this issue, we design and fabricate suspended nanodevices to accurately measure the near-field thermal radiation between co-planar membranes with subwavelength thickness. Besides 20-fold stronger thermal radiation than blackbody, we observe weaker heat transfer than the theoretical near-field predictions based on semi-infinite bodies. We investigate the reasons by identifying different near-field mechanisms and evaluating their contributions. We further realize thermal regulation by integrating overlapped nanograting structures into our co-planar nanodevices. Lastly we systematically apply platinum resistive thermometry to platinum heater for in-situ temperature monitoring. We find corrections are necessary for the widely-used thermometry formulas in literature, if it is under high temperature rise. Our work exemplifies the effectiveness of advanced thermal control through mechanisms at the nanoscale and encourages further studies in the physics of nanoscale heat transfer. 
일반주제명  
Mechanical engineering
일반주제명  
Engineering
일반주제명  
Materials science
키워드  
Co-planar nanodevices
키워드  
Nanoscale heat transfer
키워드  
Near-field thermal radiation
키워드  
Polyethylene nanofiber
키워드  
Subwavelength dimensions
키워드  
Thermal regulation
키워드  
Thermal rectification
기타저자  
Carnegie Mellon University Mechanical Engineering
기본자료저록  
Dissertations Abstracts International. 85-11B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■020    ▼a9798382610733
■035    ▼a(MiAaPQ)AAI30993412
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a621
■1001  ▼aLuo,  Xiao.
■24510▼aExtraordinary  Heat  Transfer  Within  Nanomaterials  and  Between  Nanostructures
■260    ▼a[Sl]▼bCarnegie  Mellon  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a168  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-11,  Section:  B.
■500    ▼aAdvisor:  Shen,  Sheng.
■5021  ▼aThesis  (Ph.D.)--Carnegie  Mellon  University,  2024.
■520    ▼aNanoscale  offers  great  promise  for  enhanced  heat  transfer  and  advanced  thermal  control  by  enabling  novel  material  structures  and  promoting  new  mechanisms.  This  dissertation  investigates  the  heat  transfer  behavior  at  the  nanoscale  of  both  the  solid-based  heat  conduction  and  the  media-less  thermal  radiation,  and  their  applications  in  advanced  thermal  control,  including  thermal  regulation  and  rectification.  We  first  introduce  the  novel  polyethylene  (PE)  nanofiber,  which  shows  aligned  molecular  chains  and  suppressed  intermolecular  phonon  scattering.  We  experimentally  demonstrate  that  PE  nanofiber  is  a  thermal  regulator  by  its  intrinsic  structural  phase  change.  We  further  modify  the  nanofiber  to  realize  thermal  rectification  through  partial  electron-beam  irradiation.  Then  we  explore  the  near-field  thermal  radiation  between  subwavelength  dimensions.  Near-field  thermal  radiation,  the  thermal  radiation  across  subwavelength  gap  distances  (generally  nanoscale),  has  proven  efficient  in  enhancing  radiative  heat  transfer  via  evanescent  waves.  However,  the  influence  of  subwavelength  dimensions  on  near-field  thermal  radiation  remains  unexplored,  although  it  has  proven  non-trivial  effect  on  far-field  thermal  radiation.  To  address  this  issue,  we  design  and  fabricate  suspended  nanodevices  to  accurately  measure  the  near-field  thermal  radiation  between  co-planar  membranes  with  subwavelength  thickness.  Besides  20-fold  stronger  thermal  radiation  than  blackbody,  we  observe  weaker  heat  transfer  than  the  theoretical  near-field  predictions  based  on  semi-infinite  bodies.  We  investigate  the  reasons  by  identifying  different  near-field  mechanisms  and  evaluating  their  contributions.  We  further  realize  thermal  regulation  by  integrating  overlapped  nanograting  structures  into  our  co-planar  nanodevices.  Lastly  we  systematically  apply  platinum  resistive  thermometry  to  platinum  heater  for  in-situ  temperature  monitoring.  We  find  corrections  are  necessary  for  the  widely-used  thermometry  formulas  in  literature,  if  it  is  under  high  temperature  rise.  Our  work  exemplifies  the  effectiveness  of  advanced  thermal  control  through  mechanisms  at  the  nanoscale  and  encourages  further  studies  in  the  physics  of  nanoscale  heat  transfer. 
■590    ▼aSchool  code:  0041.
■650  4▼aMechanical  engineering
■650  4▼aEngineering
■650  4▼aMaterials  science
■653    ▼aCo-planar  nanodevices
■653    ▼aNanoscale  heat  transfer
■653    ▼aNear-field  thermal  radiation
■653    ▼aPolyethylene  nanofiber
■653    ▼aSubwavelength  dimensions
■653    ▼aThermal  regulation
■653    ▼aThermal  rectification
■690    ▼a0548
■690    ▼a0794
■690    ▼a0537
■71020▼aCarnegie  Mellon  University▼bMechanical  Engineering.
■7730  ▼tDissertations  Abstracts  International▼g85-11B.
■790    ▼a0041
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17161084▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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