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Design of Ionic Liquid Based Additives for Integration with Modern Lubrication Systems
Design of Ionic Liquid Based Additives for Integration with Modern Lubrication Systems  / ...
Design of Ionic Liquid Based Additives for Integration with Modern Lubrication Systems

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자료유형  
 학위논문 서양
최종처리일시  
20260311091516.5
ISBN  
9798270229528
DDC  
668.9
저자명  
Yan, Jieming
서명/저자  
Design of Ionic Liquid Based Additives for Integration with Modern Lubrication Systems / Jieming Yan
발행사항  
[Sl] : The University of Texas at Austin, 2025
형태사항  
1 electronic resource (276 pages)
주기사항  
Source: Dissertations Abstracts International, Volume: 87-06, Section: B.
주기사항  
Advisors: Mangolini, Filippo Committee members: Brennecke, Joan; Fan, Donglei; Mitlin, David.
학위논문주기  
- Ph.D. : The University of Texas at Austin, 2025.
초록/해제  
요약The use of ionic liquids (ILs) as novel lubricants and lubricant additives has been the subject of extensive study over the last two decades. However, the implementation of ILs in tribological applications has severely been constrained by gaps in our knowledge of the origin of the promising lubricating properties of ILs. More specifically, the current picture of the IL lubrication mechanism is incomplete. While several models for IL-mediated lubrication have been proposed on the basis of substantial experimental and modeling results, they remain difficult to reconcile even for the case of the same IL owing to the drastically different conditions (e.g., contact pressure, sliding speeds) employed in published studies. Prominent engineering challenges, such as the high cost and environmental sensitivity of neat ILs, and the immiscibility of most ILs with conventional non-polar lubricants, have also limited the use of ILs in tribological applications. This dissertation contributes to addressing these challenges by establishing links between the molecular structure, lubrication performance, and lubrication mechanisms of a novel class of ILs, and by encapsulating ILs within polymer capsules to enable their introduction in oils in a concentration that exceeds their solubility limit, while limiting their corrosiveness. To provide new insights into the lubrication mechanisms of ILs, a homologous series of tetraalkylammonium orthoborate ILs was synthesized. The correlation of the results of tribological experiments with the outcomes of surface analyses demonstrated the effect of IL architecture on the IL friction- and wear-reducing behavior, while also providing insights into the surface chemical processes controlling the tribological response. Encapsulating ILs within polymer shells was explored as a new method for enabling the use of ILs in oil formulations. Initial experiments with encapsulated ILs (ENILs) were performed with commercially available 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([HMIM][TFSI]) encapsulated in crosslinked polymethacrylate microcapsules. Tribological tests showed that the use of ENILs as additives in synthetic oil can achieve the same degree of friction and wear reduction as the neat ILs (in this case [HMIM][TFSI]). The use of ENIL additives also drastically reduced surface corrosion - a common issue faced when using neat halogenated ILs such as [HMIM][TFSI]. The subsequent synthesis of ENILs using different encapsulation methods (e.g., interfacial polymerization, Pickering emulsion-templating) allowed for elucidating the effect of polymer shell material chemistry and capsule size distribution on the friction and wear response, thus providing design guidelines for ENILs to be employed in tribological applications. The results presented in this dissertation not only further our understanding of IL-mediated lubrication, but also present a pathway towards and a design framework for the practical utilization of IL-based additives in liquid lubricants via encapsulation.
언어주기  
English
일반주제명  
Materials science
일반주제명  
Polymer chemistry
일반주제명  
Organic chemistry
키워드  
Ionic liquids
키워드  
Lubricant additives
키워드  
Molecular structure
키워드  
Lubrication mechanisms
키워드  
Polymer shells
기타저자  
The University of Texas at Austin Materials Science and Engineering
기본자료저록  
Dissertations Abstracts International. 87-06B.
전자적 위치 및 접속  
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MARC

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■020    ▼a9798270229528
■040    ▼aMiAaPQD▼beng▼cMiAaPQD▼erda
■082    ▼a668.9
■1001  ▼aYan,  Jieming▼eauthor.
■24510▼aDesign  of  Ionic  Liquid  Based  Additives  for  Integration  with  Modern  Lubrication  Systems  ▼cJieming  Yan
■260    ▼a[Sl]▼bThe  University  of  Texas  at  Austin▼c2025
■264  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a1  electronic  resource  (276  pages)
■336    ▼atext▼btxt▼2rdacontent
■337    ▼acomputer▼bc▼2rdamedia
■338    ▼aonline  resource▼bcr▼2rdacarrier
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-06,  Section:  B.
■500    ▼aAdvisors:  Mangolini,  Filippo    Committee  members:  Brennecke,  Joan;  Fan,  Donglei;  Mitlin,  David.
■5021  ▼bPh.D.▼cThe  University  of  Texas  at  Austin▼d2025.
■520    ▼aThe  use  of  ionic  liquids  (ILs)  as  novel  lubricants  and  lubricant  additives  has  been  the  subject  of  extensive  study  over  the  last  two  decades.  However,  the  implementation  of  ILs  in  tribological  applications  has  severely  been  constrained  by  gaps  in  our  knowledge  of  the  origin  of  the  promising  lubricating  properties  of  ILs.  More  specifically,  the  current  picture  of  the  IL  lubrication  mechanism  is  incomplete.  While  several  models  for  IL-mediated  lubrication  have  been  proposed  on  the  basis  of  substantial  experimental  and  modeling  results,  they  remain  difficult  to  reconcile  even  for  the  case  of  the  same  IL  owing  to  the  drastically  different  conditions  (e.g.,  contact  pressure,  sliding  speeds)  employed  in  published  studies.  Prominent  engineering  challenges,  such  as  the  high  cost  and  environmental  sensitivity  of  neat  ILs,  and  the  immiscibility  of  most  ILs  with  conventional  non-polar  lubricants,  have  also  limited  the  use  of  ILs  in  tribological  applications.                        This  dissertation  contributes  to  addressing  these  challenges  by  establishing  links  between  the  molecular  structure,  lubrication  performance,  and  lubrication  mechanisms  of  a  novel  class  of  ILs,  and  by  encapsulating  ILs  within  polymer  capsules  to  enable  their  introduction  in  oils  in  a  concentration  that  exceeds  their  solubility  limit,  while  limiting  their  corrosiveness.                        To  provide  new  insights  into  the  lubrication  mechanisms  of  ILs,  a  homologous  series  of  tetraalkylammonium  orthoborate  ILs  was  synthesized.  The  correlation  of  the  results  of  tribological  experiments  with  the  outcomes  of  surface  analyses  demonstrated  the  effect  of  IL  architecture  on  the  IL  friction-  and  wear-reducing  behavior,  while  also  providing  insights  into  the  surface  chemical  processes  controlling  the  tribological  response.                        Encapsulating  ILs  within  polymer  shells  was  explored  as  a  new  method  for  enabling  the  use  of  ILs  in  oil  formulations.  Initial  experiments  with  encapsulated  ILs  (ENILs)  were  performed  with  commercially  available  1-hexyl-3-methylimidazolium  bis(trifluoromethylsulfonyl)imide  ([HMIM][TFSI])  encapsulated  in  crosslinked  polymethacrylate  microcapsules.  Tribological  tests  showed  that  the  use  of  ENILs  as  additives  in  synthetic  oil  can  achieve  the  same  degree  of  friction  and  wear  reduction  as  the  neat  ILs  (in  this  case  [HMIM][TFSI]).  The  use  of  ENIL  additives  also  drastically  reduced  surface  corrosion  -  a  common  issue  faced  when  using  neat  halogenated  ILs  such  as  [HMIM][TFSI].  The  subsequent  synthesis  of  ENILs  using  different  encapsulation  methods  (e.g.,  interfacial  polymerization,  Pickering  emulsion-templating)  allowed  for  elucidating  the  effect  of  polymer  shell  material  chemistry  and  capsule  size  distribution  on  the  friction  and  wear  response,  thus  providing  design  guidelines  for  ENILs  to  be  employed  in  tribological  applications.                        The  results  presented  in  this  dissertation  not  only  further  our  understanding  of  IL-mediated  lubrication,  but  also  present  a  pathway  towards  and  a  design  framework  for  the  practical  utilization  of  IL-based  additives  in  liquid  lubricants  via  encapsulation.
■546    ▼aEnglish
■590    ▼aSchool  code:  0227
■650  4▼aMaterials  science
■650  4▼aPolymer  chemistry
■650  4▼aOrganic  chemistry
■653    ▼aIonic  liquids
■653    ▼aLubricant  additives
■653    ▼aMolecular  structure
■653    ▼aLubrication  mechanisms  
■653    ▼aPolymer  shells
■7102  ▼aThe  University  of  Texas  at  Austin▼bMaterials  Science  and  Engineering.▼edegree  granting  institution.
■7201  ▼aMangolini,  Filippo▼edegree  supervisor.
■7730  ▼tDissertations  Abstracts  International▼g87-06B.
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17361151▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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