Barium sulfate nanocrystals of average 40 nm sizes were prepared by the micellar solution spray process. The influences of atomized impingement flow on nanoparticle formation and stabilization were inspected on the basis of Fourier transform infrared (FTIR), X-ray diffraction, and transmission electron microscopy analysis. Poly(styrenebutylacrylate-acrylic acid) (PSBA) nanocomposites were synthesized by in situ copolymerization in the presence of 0.5-2.5% BaSO 4 nanoparticles. FTIR and atomic force microscopy analysis confirmed the uniform dispersion of 2% or less nano-BaSO 4 within the PSBA matrix. The strength of interfacial adhesion between the nanoparticle and copolymer was examined on the basis of hydroscopicity, differential scanning calorimetry, thermogravimetric analysis, and universal testing machine analysis of nanocomposite film. The glass transition and thermal decomposition temperatures of PSBA latex were shifted toward higher temperatures by the restriction of nanoBaSO 4 on its segmental and long-range chain mobility. The well-dispersed nano-BaSO 4 , with a larger fraction of immobilized copolymer on the pigment surface, improves the scratch and abrasion resistance, decreases the water uptake, and increases the tensile strength and elongation at break of the latex film within the specific loading. Thus, fabricating the PSBA/BaSO 4 nanocomposite presents an effective approach for development of latex coatings with enhanced performance. POLYM. COMPOS., 34:1670-1681,
Size and composition control of core-shell structured iron/iron-oxide nanoparticles J. Appl. Phys. 107, 09A333 (2010); 10.1063/1.3368720Effects of particle size and composition on coercivity of Sm-Co nanoparticles prepared by surfactant-assisted ball milling J. Appl. Phys. 107, 09A703 (2010); 10.1063/1.3334460 Synthesis, structural, magnetic, and cytotoxic properties of iron oxide coated iron/iron-carbide nanocomposite particles Nanoparticles find wide applications as nanopigments in the field of surface coatings. Their role in enhancement of durability, transparency, scratch resistance, thixotropy, dispersion stability, etc., has been discussed. The aim of the present investigation was to conduct synthesis of nanoparticles, viz., prussian blue ͑Fe 4 ͓Fe͑CN͒ 6 ͔ 3 ͒ and iron oxide, which are widely used as prime pigments in paints. The syntheses of nanosize pigments by different routes, however, were associated with difficulties of regulating particle size distribution and stabilizing this distribution. In the present work, use of cetyl trimethyl ammonium bromide, sodium dodecyl sulfate, Tween 80, and potassium dodecyl benzene sulfonate as surfactant and contact of precursor and precipitator in atomized mode as means of stabilizing particle size within the range of 12-32 nm has been established. IR, x-ray powder diffraction, and color matching monitored the synthesis. It was observed that finer tuning of particle size of prussian blue and ferric oxide in the presence of surfactant was governed by viscosity, spray pressure, degree of atomization, and surfactant/reactant concentration. Acrylate latex nanocomposites were prepared through emulsion polymerization of methyl methacrylate, butyl acrylate, and methylacrylic acid in the presence of prussian blue. The mechanical, stability, and rheological characteristics of nanolatex paints were determined and interpreted. Single step surfactant modified solution spray synthesis at ambient temperature thus presents a feasible technique suitable for the production of nanoparticles at industrial scale.
CaCO 3 nanoparticles were synthesised in patented solution spray reactor system using non-ionic Tween-80 surfactant as template. Design of solution spray reactor permits the intimate thin film contact between the highly atomized precursor and precipitant solutions to control the CaCO 3 size in 25-90 nm range. CaCO 3 nanoparticles were surface modified with cmethacryloxypropyltrimethoxysilane (GMPTS) in order to improve the compatibility with polymer matrix. CaCO 3 /acrylic co-polymer latex nanocomposites were prepared by in situ emulsion polymerization with 0.5-2.5 wt % loadings of nanoCaCO 3 . Functional group, surface modification, crystal phase, size and morphology of CaCO 3 nanoparticles were determined by their FTIR, XRD and FESEM analysis. DSC and TGA analysis was performed to establish the rise in thermal stability of latex nanocomposites due to inclusion of nanoCaCO 3 , while its ultrafine dispersion in polymer matrix was confirmed by FESEM analysis of latex nanocomposite films. Interior waterborne decorative paints were formulated using CaCO 3 /acrylic co-polymer latex nanocomposites as binder. Overall three fold rise in performance of latex nanocomposite paint over that of clear
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