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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
Detailed Information
- 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
- Polymer shells
- 기타저자
- The University of Texas at Austin Materials Science and Engineering
- 기본자료저록
- Dissertations Abstracts International. 87-06B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■006m o d
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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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