Structure of nanoparticles embedded in micellar polycrystals

Langmuir : the ACS Journal of Surfaces and Colloids
Elisa TamboriniLaurence Ramos

Abstract

We investigate by scattering techniques the structure of water-based soft composite materials comprising a crystal made of Pluronic block-copolymer micelles arranged in a face-centered cubic lattice and a small amount (at most 2% by volume) of silica nanoparticles, of size comparable to that of the micelles. The copolymer is thermosensitive: it is hydrophilic and fully dissolved in water at low temperature (T ~ 0 °C), and self-assembles into micelles at room temperature, where the block-copolymer is amphiphilic. We use contrast matching small-angle neuron scattering experiments to independently probe the structure of the nanoparticles and that of the polymer. We find that the nanoparticles do not perturb the crystalline order. In addition, a structure peak is measured for the silica nanoparticles dispersed in the polycrystalline samples. This implies that the samples are spatially heterogeneous and comprise, without macroscopic phase separation, silica-poor and silica-rich regions. We show that the nanoparticle concentration in the silica-rich regions is about 10-fold the average concentration. These regions are grain boundaries between crystallites, where nanoparticles concentrate, as shown by static light scattering and by li...Continue Reading

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Citations

Oct 2, 2012·The Review of Scientific Instruments·E Tamborini, L Cipelletti
Aug 1, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·J S Nambam, John Philip
Oct 23, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Biswajit Sarkar, Paschalis Alexandridis
Jun 2, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Rafael Serra-GómezGustavo González-Gaitano
Apr 6, 2018·Physical Chemistry Chemical Physics : PCCP·Reddicherla UmapathiPannuru Venkatesu
Oct 16, 2015·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Ameur LouhichiLaurence Ramos
Mar 5, 2019·Micron : the International Research and Review Journal for Microscopy·Alejandra Londono-CalderonTanya Prozorov
Aug 30, 2014·Physical Review Letters·Elisa TamboriniLaurence Ramos
Apr 29, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Rafael S Kurusu, Nicole R Demarquette

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