Evaporation induced self-assembly of ordered structures from a capillary-held solution

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dc.contributor.advisor Zhiqun Lin
dc.contributor.author Hong, Suck
dc.contributor.department Materials Science and Engineering
dc.date 2018-08-22T16:32:24.000
dc.date.accessioned 2020-06-30T07:46:01Z
dc.date.available 2020-06-30T07:46:01Z
dc.date.copyright Tue Jan 01 00:00:00 UTC 2008
dc.date.issued 2008-01-01
dc.description.abstract <p>The use of spontaneous self-assembly as a lithography and external fields-free means to construct well-ordered, often intriguing structures has received much attention as a result of the ease of producing complex structures with small feature sizes. Self-assembly via irreversible solvent evaporation of a droplet containing nonvolatile solutes (polymers, nanoparticles, and colloids) represents one such case. However, the flow instabilities within the evaporating droplet often result in irregular dissipative structures (e.g., convection patterns and fingering instabilities). Therefore, fully utilizing evaporation as a simple tool for creating well-ordered structures that have numerous technological applications requires delicate control over several factors, including the evaporative flux, solution concentration, interfacial interaction between the solute and the substrate, etc.;In this study, we developed a simple route to produce highly regular polymeric structures in an easily controllable, cost-effective, and reproducible manner simply by allowing a drop to evaporate in a confined geometry consisting of a sphere on a Si surface (i.e., a sphere-on-Si geometry). The confined geometry provides unique environment for controlling the flow within the evaporating droplet, which, in turn, regulates the structure formation. A variety of polymers, including poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV), poly(ferrocenyldimethylsilane) (PFS), polystyrene (PS), poly(methyl methacrylate) (PMMA), and polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA), are selected as nonvolatile solutes. A number of parameters are found to effectively mediate the structure formation, including the solution concentration, the interfacial interaction between the solute and the substrate, curvature and molecular effect. This simple, lithography-free route allows subsequent preparation of various metal, metal oxide, and carbon nanotube patterns with controlled spacing, size, and thickness.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/15630/
dc.identifier.articleid 16629
dc.identifier.contextkey 7037803
dc.identifier.doi https://doi.org/10.31274/rtd-180813-16844
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/15630
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/69283
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/15630/3307057.PDF|||Fri Jan 14 20:44:12 UTC 2022
dc.subject.disciplines Materials Science and Engineering
dc.subject.keywords Materials science and engineering;
dc.title Evaporation induced self-assembly of ordered structures from a capillary-held solution
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication bf9f7e3e-25bd-44d3-b49c-ed98372dee5e
thesis.degree.level dissertation
thesis.degree.name Doctor of Philosophy
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