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DC Field | Value | Language |
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dc.citation.endPage | 47 | - |
dc.citation.number | 1-3 | - |
dc.citation.startPage | 43 | - |
dc.citation.title | COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | - |
dc.citation.volume | 274 | - |
dc.contributor.author | Cho, Jaeweon | - |
dc.contributor.author | Park, Young-Jun | - |
dc.contributor.author | Sun, Hyang | - |
dc.contributor.author | Kim, Suhan | - |
dc.contributor.author | Yoon, Yeomin | - |
dc.date.accessioned | 2023-12-22T10:08:16Z | - |
dc.date.available | 2023-12-22T10:08:16Z | - |
dc.date.created | 2015-07-01 | - |
dc.date.issued | 2006-02 | - |
dc.description.abstract | A theoretical diffusivity equation was proposed by Einstein [A. Einstein, Investigations of the Theory of the Brownian Movement, Dover Publication Inc., New York, 1956]; thermodynamic and drag (i.e., resistance or mobility relation) forces were compared at equilibrium. The diffusivity relationship, the ratio of the thermodynamic and drag forces, was combined with steady-state convection and diffusion equations to finally give a relationship between the retention times from flow field-flow fractionation (fl-FFF) and the diffusivity of a particle. An asymmetric fl-FFF system equipped with a regenerated Cellulose membrane with molecular weight cutoff of 1000 and a micro channel employing both laminar channel and cross flows, was used to obtain chromatograms, using UV detection. A wide range of nano-colloids and micro-particles were measured with respect to their effective sizes and diffusivities. The classical FFF theory was incorporated with two different diffusion estimation relations: the Brownian and shear-induced diffusivities. It was found that the fl-FFF system provided similar and much lower sizes compared to absolute sizes provided by the manufacturer, for the smaller colloids (30, 60 nm), and the larger nano-colloids (90 nm and 0.2, 0.3, 0.43 and 0.5 mu m) and micro-particles (0.5, 0.701, 0.993, 2, 3.1, and 8 mu m), respectively. This was due to the larger nano-colloids and micro-particles being influenced by both the Brownian (the normal FFF mode) and shear-induced (the hyperlayer FFF mode) diffusions under the channel laminar and crossing flows condition within the micro channel of the fl-FFF system, which provided effective colloids and particles sizes. For all the nano-colloids and micro-particles, the fl-FFF system was able to determine the effective diffusion coefficients, irrespective of their size. For the micro-particles, the dimensionless diffusion coefficient was suggested to depend on the particle size, rather than that obtained by different methods suggested in previous works [E.C. Eckstein, D.G. Bailey, A.H.. Shapiro, Self-diffusion of particles in shear flow of a suspension, J. Fluid Mech. 79 (Part 1) (1977) 191-208; D. Leighton, A. Acrivos, Measurement of shear-induced self-diffusion in concentrated suspensions of spheres, J. Fluid Mech. 177 (1987) 109-131]. (c) 2005 Elsevier B.V. All rights reserved | - |
dc.identifier.bibliographicCitation | COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, v.274, no.1-3, pp.43 - 47 | - |
dc.identifier.doi | 10.1016/j.colsurfa.2005.08.036 | - |
dc.identifier.issn | 0927-7757 | - |
dc.identifier.scopusid | 2-s2.0-31144440416 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/11782 | - |
dc.identifier.url | http://www.sciencedirect.com/science/article/pii/S0927775705006151 | - |
dc.identifier.wosid | 000235358100007 | - |
dc.language | 영어 | - |
dc.publisher | ELSEVIER SCIENCE BV | - |
dc.title | Measurements of effective sizes and diffusivities of nano-colloids and micro-particles | - |
dc.type | Article | - |
dc.description.journalRegisteredClass | scopus | - |
dc.subject.keywordAuthor | effective size | - |
dc.subject.keywordAuthor | diffusivity | - |
dc.subject.keywordAuthor | nano-colloids | - |
dc.subject.keywordAuthor | micro-particles | - |
dc.subject.keywordAuthor | flow field-flow fractionation | - |
dc.subject.keywordPlus | FIELD-FLOW FRACTIONATION | - |
dc.subject.keywordPlus | SELF-DIFFUSION | - |
dc.subject.keywordPlus | TRANSPORT | - |
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