Nanorods of Well-Defined Length and Monodisperse Cross-Section Obtained from Electrostatic Complexation of Nanoparticles with a Semiflexible Biopolymer

Abstract : We show by combining small-angle X-ray scattering (SAXS) and cryo-transmission electron microscopy (cryo-TEM) that anionic silica nanoparticles (SiNPs) assemble into well-defined 1D cluster when mixed with a dilute solution of semiflexible chitosan polycation. The nanorods are stable in excess of SiNPs and composed of 10 SiNPs well-ordered into straight single strands with length Lrod ≈ 184.0 nm and radius Rrod = 9.2 nm = RSiNPs. We point out that the ratio between the chitosan persistence length and the SiNP radius, which is here equal to 1, can be the determining condition to obtain such original objects.
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Submitted on : Saturday, October 20, 2012 - 11:01:00 PM
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Li Shi, Florent Carn, François Boué, Gervaise Mosser, Eric Buhler. Nanorods of Well-Defined Length and Monodisperse Cross-Section Obtained from Electrostatic Complexation of Nanoparticles with a Semiflexible Biopolymer. ACS Macro Letters, Washington, D.C : American Chemical Society, 2012, 1 (3), pp.857-861. ⟨10.1021/mz300200y⟩. ⟨hal-00743826⟩

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