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Colloidal Stability and Assembly of Double Functionalized Silica Nanoparticles at Oil-Water Interfaces: An Approach to Interfacial Engineering Strategies
Colloidal Stability and Assembly of Double Functionalized Silica Nanoparticles at Oil-Water Interfaces: An Approach to Interfacial Engineering Strategies
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211152128
- ISBN
- 9798384050698
- DDC
- 660
- 서명/저자
- Colloidal Stability and Assembly of Double Functionalized Silica Nanoparticles at Oil-Water Interfaces: An Approach to Interfacial Engineering Strategies
- 발행사항
- [Sl] : Cornell University, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 226 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-03, Section: B.
- 주기사항
- Advisor: Giannelis, Emmanuel.
- 학위논문주기
- Thesis (Ph.D.)--Cornell University, 2024.
- 초록/해제
- 요약Particle-stabilized emulsions (Pickering emulsions) have gained significant interest due to their high stability, tunability, and biocompatibility. This study presents the synthesis of colloidally stable nanoparticles and the formation of stable Pickering emulsions using pH and electrolyte-responsive silica nanoparticles functionalized with a mix of silanes containing amine/ammonium groups.Colloidal stability of the silica nanoparticles is enhanced when functionalized with a mixture of silanes compared to single-silane functionalization. Nanoparticle suspensions synthesized with a 50:50 mixture of N1-(3-trimethoxysilylpropyl) diethylenetriamine and N-trimethoxysilylpropyl-N,N,N-trimethylammonium in complex brine containing various salts remain suspended under 500xg acceleration and temperatures up to 60 °C. In contrast, single-silane functionalized particles show far less stability. This improved stability is linked to the silane-grafted layers and surface roughness, as observed via Atomic Force Microscopy (AFM).The assembly of nanoparticles at the oil-water interface is influenced by electrostatic interactions between the particles and oil, and interparticle interactions, modulated by pH or salt addition. Under acidic conditions, with positively charged oil-water interfaces and nanoparticles, no significant reduction in interfacial tension is observed. Conversely, under basic conditions where the oil-water interface is highly negatively charged and the amine groups on the silica particles are deprotonated, the nanoparticles assemble densely at the interface, resulting in a high dilatational modulus. This prevents oil droplets from coalescing, significantly enhancing emulsion stability.When suspended in brine containing 56,000 g/L of monovalent and divalent salts, nanoparticle assembly at the oil-water interface is more pronounced compared to DI water at pH 7. Ultra-small/small-angle X-ray scattering measurements confirm nanoparticle assembly at the interface, with time-dependent scattering measurements revealing a two-step assembly process consistent with interfacial tension dynamics. The assembled nanoparticles at the interface induce a solid-like behavior or jamming, making the interface act like an elastic membrane with high dilatational and storage moduli.This study provides fundamental insights into the surface and interfacial properties of silane-grafted nanoparticles, highlighting ways to optimize their assembly at oil-water interfaces while enhancing their colloidal stability under harsh conditions. These findings have implications for environmental remediation, catalysis, drug delivery, food technology, and oil recovery applications.
- 일반주제명
- Chemical engineering
- 일반주제명
- Engineering
- 일반주제명
- Materials science
- 일반주제명
- Nanotechnology
- 키워드
- Interfaces
- 키워드
- Nanoparticles
- 기타저자
- Cornell University Chemical Engineering
- 기본자료저록
- Dissertations Abstracts International. 86-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211152128
■006m o d
■007cr#unu||||||||
■020 ▼a9798384050698
■035 ▼a(MiAaPQ)AAI31482940
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a660
■1001 ▼aAlsmaeil, Ahmed Wasel.▼0(orcid)0000-0001-7121-9876
■24510▼aColloidal Stability and Assembly of Double Functionalized Silica Nanoparticles at Oil-Water Interfaces: An Approach to Interfacial Engineering Strategies
■260 ▼a[Sl]▼bCornell University▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a226 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-03, Section: B.
■500 ▼aAdvisor: Giannelis, Emmanuel.
■5021 ▼aThesis (Ph.D.)--Cornell University, 2024.
■520 ▼aParticle-stabilized emulsions (Pickering emulsions) have gained significant interest due to their high stability, tunability, and biocompatibility. This study presents the synthesis of colloidally stable nanoparticles and the formation of stable Pickering emulsions using pH and electrolyte-responsive silica nanoparticles functionalized with a mix of silanes containing amine/ammonium groups.Colloidal stability of the silica nanoparticles is enhanced when functionalized with a mixture of silanes compared to single-silane functionalization. Nanoparticle suspensions synthesized with a 50:50 mixture of N1-(3-trimethoxysilylpropyl) diethylenetriamine and N-trimethoxysilylpropyl-N,N,N-trimethylammonium in complex brine containing various salts remain suspended under 500xg acceleration and temperatures up to 60 °C. In contrast, single-silane functionalized particles show far less stability. This improved stability is linked to the silane-grafted layers and surface roughness, as observed via Atomic Force Microscopy (AFM).The assembly of nanoparticles at the oil-water interface is influenced by electrostatic interactions between the particles and oil, and interparticle interactions, modulated by pH or salt addition. Under acidic conditions, with positively charged oil-water interfaces and nanoparticles, no significant reduction in interfacial tension is observed. Conversely, under basic conditions where the oil-water interface is highly negatively charged and the amine groups on the silica particles are deprotonated, the nanoparticles assemble densely at the interface, resulting in a high dilatational modulus. This prevents oil droplets from coalescing, significantly enhancing emulsion stability.When suspended in brine containing 56,000 g/L of monovalent and divalent salts, nanoparticle assembly at the oil-water interface is more pronounced compared to DI water at pH 7. Ultra-small/small-angle X-ray scattering measurements confirm nanoparticle assembly at the interface, with time-dependent scattering measurements revealing a two-step assembly process consistent with interfacial tension dynamics. The assembled nanoparticles at the interface induce a solid-like behavior or jamming, making the interface act like an elastic membrane with high dilatational and storage moduli.This study provides fundamental insights into the surface and interfacial properties of silane-grafted nanoparticles, highlighting ways to optimize their assembly at oil-water interfaces while enhancing their colloidal stability under harsh conditions. These findings have implications for environmental remediation, catalysis, drug delivery, food technology, and oil recovery applications.
■590 ▼aSchool code: 0058.
■650 4▼aChemical engineering
■650 4▼aEngineering
■650 4▼aMaterials science
■650 4▼aNanotechnology
■653 ▼aInterfaces
■653 ▼aInterfacial rheology
■653 ▼aNanoparticles
■653 ▼aPickering emulsions
■653 ▼aAtomic Force Microscopy
■690 ▼a0542
■690 ▼a0794
■690 ▼a0537
■690 ▼a0652
■71020▼aCornell University▼bChemical Engineering.
■7730 ▼tDissertations Abstracts International▼g86-03B.
■790 ▼a0058
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17163044▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
