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Towards Device-Ready Colloidal Crystals Engineered With DNA
Towards Device-Ready Colloidal Crystals Engineered With DNA
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105138
- ISBN
- 9798270227104
- DDC
- 540
- 저자명
- Wong, Alexa M.
- 서명/저자
- Towards Device-Ready Colloidal Crystals Engineered With DNA
- 발행사항
- [Sl] : Northwestern University, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 149 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-06, Section: B.
- 주기사항
- Advisor: Mirkin, Chad A.
- 학위논문주기
- Thesis (Ph.D.)--Northwestern University, 2025.
- 초록/해제
- 요약The crystallization of colloidal nanoparticles into ordered superlattices offers a powerful route to precisely engineer nanoscale materials. Among the chemical constructs for directing colloidal crystallization, DNA has emerged as a highly programmable ligand, whose molecular specificity enables the precise assembly of nanoparticle superlattices with diverse symmetries and interparticle spacings. These architectures exhibit emergent properties, often absent in Nature, that could underpin next-generation technologies. However, the inherently stochastic nature of colloidal crystallization poses a bottleneck to their scalability and integration into functional devices. To address this challenge, this dissertation explores a microwell approach that leverages spatial confinement to modulate crystallization events. This strategy enables precise control over superlattice architecture and expands the scope of accessible structures.Chapter 1 introduces the field of colloidal crystal engineering, with an emphasis on DNA-mediated assembly of nanoparticle superlattices. It examines the various methodologies developed to direct nanoparticle assembly, the range of crystal structures that can be achieved, and the associated material properties. The chapter concludes by highlighting the ongoing challenge of integrating these designer colloidal crystal materials into functional devices, establishing the motivation for the work presented in this dissertation.Chapter 2 presents lithographically defined microwells as a new platform for studying DNA-guided colloidal superlattice design parameters, including superlattice position, habit orientation, and size. Growth pathways were examined via ex situ electron microscopy. Importantly, this work identified an unusual Volmer-Weber growth mode for single-crystalline superlattice formation within confinement.Chapter 3 investigates how supersaturation modulates crystallization pathways and demonstrates that microwells enable access to metastable superlattices with non-equilibrium habits. By combining DNA-guided assembly with microwell templates, the study establishes a highly modular, multi-scale framework that allows independent control over each structural parameter in a hierarchical device. In a proof-of-concept demonstration, this approach is used to fabricate a metasurface exhibiting a near-IR resonance peak, an emergent optical response arising from the collective contribution of all structural parameters.In Chapter 4, DNA interaction strength is programmed to temporally sequence crystallization events so that phase-separated superlattices can be accessed. Combined with microwell templates, this strategy enables spatiotemporal control of colloidal crystallization, yielding asymmetrical architectures such as Janus superlattices. Together, these strategies expand the toolbox for nanoscale feature engineering and system-level property design.Finally, Chapter 5 summarizes key lessons learned from this research and outlines future opportunities in the field of colloidal crystal engineering. Collectively, this work achieves several advances in colloidal crystal engineering with DNA, including (1) superlattices synthesized with narrow size distributions (5.9% RSD) and controlled spatial positioning and orientation; (2) crystal habits programmed independently of lattice symmetry; (3) a functional metasurface device from superlattice arrays; and (4) precise strategies for compositionally complex architectures. These advances pave the way for structure-function mapping and realizing inverse design in nanoparticle-based hierarchical materials.
- 일반주제명
- Chemistry
- 일반주제명
- Nanoscience
- 키워드
- Nanoparticles
- 기타저자
- Northwestern University Chemistry
- 기본자료저록
- Dissertations Abstracts International. 87-06B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■007cr#unu||||||||
■020 ▼a9798270227104
■035 ▼a(MiAaPQ)AAI32240138
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a540
■1001 ▼aWong, Alexa M.
■24510▼aTowards Device-Ready Colloidal Crystals Engineered With DNA
■260 ▼a[Sl]▼bNorthwestern University▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a149 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-06, Section: B.
■500 ▼aAdvisor: Mirkin, Chad A.
■5021 ▼aThesis (Ph.D.)--Northwestern University, 2025.
■520 ▼aThe crystallization of colloidal nanoparticles into ordered superlattices offers a powerful route to precisely engineer nanoscale materials. Among the chemical constructs for directing colloidal crystallization, DNA has emerged as a highly programmable ligand, whose molecular specificity enables the precise assembly of nanoparticle superlattices with diverse symmetries and interparticle spacings. These architectures exhibit emergent properties, often absent in Nature, that could underpin next-generation technologies. However, the inherently stochastic nature of colloidal crystallization poses a bottleneck to their scalability and integration into functional devices. To address this challenge, this dissertation explores a microwell approach that leverages spatial confinement to modulate crystallization events. This strategy enables precise control over superlattice architecture and expands the scope of accessible structures.Chapter 1 introduces the field of colloidal crystal engineering, with an emphasis on DNA-mediated assembly of nanoparticle superlattices. It examines the various methodologies developed to direct nanoparticle assembly, the range of crystal structures that can be achieved, and the associated material properties. The chapter concludes by highlighting the ongoing challenge of integrating these designer colloidal crystal materials into functional devices, establishing the motivation for the work presented in this dissertation.Chapter 2 presents lithographically defined microwells as a new platform for studying DNA-guided colloidal superlattice design parameters, including superlattice position, habit orientation, and size. Growth pathways were examined via ex situ electron microscopy. Importantly, this work identified an unusual Volmer-Weber growth mode for single-crystalline superlattice formation within confinement.Chapter 3 investigates how supersaturation modulates crystallization pathways and demonstrates that microwells enable access to metastable superlattices with non-equilibrium habits. By combining DNA-guided assembly with microwell templates, the study establishes a highly modular, multi-scale framework that allows independent control over each structural parameter in a hierarchical device. In a proof-of-concept demonstration, this approach is used to fabricate a metasurface exhibiting a near-IR resonance peak, an emergent optical response arising from the collective contribution of all structural parameters.In Chapter 4, DNA interaction strength is programmed to temporally sequence crystallization events so that phase-separated superlattices can be accessed. Combined with microwell templates, this strategy enables spatiotemporal control of colloidal crystallization, yielding asymmetrical architectures such as Janus superlattices. Together, these strategies expand the toolbox for nanoscale feature engineering and system-level property design.Finally, Chapter 5 summarizes key lessons learned from this research and outlines future opportunities in the field of colloidal crystal engineering. Collectively, this work achieves several advances in colloidal crystal engineering with DNA, including (1) superlattices synthesized with narrow size distributions (5.9% RSD) and controlled spatial positioning and orientation; (2) crystal habits programmed independently of lattice symmetry; (3) a functional metasurface device from superlattice arrays; and (4) precise strategies for compositionally complex architectures. These advances pave the way for structure-function mapping and realizing inverse design in nanoparticle-based hierarchical materials.
■590 ▼aSchool code: 0163.
■650 4▼aChemistry
■650 4▼aNanoscience
■653 ▼aColloidal crystallization
■653 ▼aNanoparticles
■690 ▼a0485
■690 ▼a0565
■71020▼aNorthwestern University▼bChemistry.
■7730 ▼tDissertations Abstracts International▼g87-06B.
■790 ▼a0163
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359561▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


