Colloids and Surfaces A 538 (2018) 678–685 Contents lists available at ScienceDirect Colloids and Surfaces A journal homepage: www.elsevier.com/locate/colsurfa Separation of diﬀerent-sized silica nanoparticles using asymmetric ﬂow ﬁeld-ﬂow fractionation by control of the Debye length of the particles with the addition of electrolyte molecules Haruhisa Kato , Ayako Nakamura, Hidekuni Banno, Mikiko Shimizu National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5, Higashi 1-1-1, Tsukuba, Ibaraki 305-8565, Japan GR APHICAL A BSTRACT ARTICLE I NFO ABSTRACT Keywords: Asymmetric ﬂow ﬁeld-ﬂow fractionation (AF4) is widely used in nanotechnology to fractionate objective size Asymmetric ﬂow ﬁeld-ﬂow fractionation from samples with wide size distributions. Essentially, the size separation of nanoparticles by AF4 is based on the Silica nanoparticle diﬀusivity/size of the objects; however; we found unexpected results when using AF4 for the separation of Size diﬀerent-sized silica nanoparticles. Using pure water as the carrier liquid in the AF4 assessment, silica nano- Sodium dodecyl sulfate particles of 50 and 100 nm were eluted out at almost the same retention time because of the cooperative dif- Debye length fusion derived by larger amounts of particles. After reducing the total concentration of silica particles, since the Zeta potential
Colloids and Surfaces A: Physicochemical and Engineering Aspects – Elsevier
Published: Feb 5, 2018
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