Materials Literature
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Local segregation in melts of copolymers with composition gradients along their backbones is analyzed. The transition to a lamellar periodic structure as the effective degree of incompatibility χ N increases is studied for symmetric copolymers with various composition gradients. A numerical self-consistent mean-field…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTDirect Evidence for Vertical Diffusion and Exchange Processes of Polyanions and Polycations in Polyelectrolyte Multilayer FilmsPhilippe Lavalle, Valérie Vivet, Nadia Jessel, Gero Decher, Jean-Claude Voegel, Philippe J. Mesini, and Pierre SchaafView Author Information Institut N…
Polyaniline tubes have been prepared using sub-micrometer polymer fibers as templates. The core fibers were fabricated by a nonmechanical electrostatic process known as electrospinning. Conductive polyaniline (PANi) was coated on the surface of preformed polymer nanofibers through in situ deposition. The removal of th…
Abstract The main aim of this work was to study and compare the mechanical and thermal properties of hybrid polypropylene (PP) composites and single‐filler PP composites. With two main types of mineral fillers—calcium carbonate (CaCO 3 ) and talc—PP composites of different filler weight ratios (talc/CaCO 3 ) were comp…
The exfoliated ZnAl hydroxide sheets of LLDPE/ZnAl LDH exfoliated nanocomposite with 20 wt % loading of Zn3Al(DS) are dispersed in a disordered fashion in the LLDPE matrix. The thickness and the width/length of the individual exfoliated Zn3Al(DS) layers (combined with DS ions) are determined to be 1.5−2.5 and 15−20 nm…
Transport properties of ${\mathrm{Ba}}_{8}{\mathrm{Ga}}_{16}{\mathrm{Ge}}_{30}$ single-crystalline samples prepared with an excess of Ga are presented. The excess Ga does not only produces p-type transport properties but also a thermal conductivity (\ensuremath{\kappa}) that, unlike in any other ${\mathrm{Ba}}_{8}{\ma…
Stimulus-responsive, surface confined poly( N -isopropylacrylamide) (pNIPAAM) brush nanopatterns were prepared on gold-coated silicon substrates in a “grafting-from” approach that combines “nanoshaving”, a scanning probe lithography method, with surface-initiated polymerization using atom transfer radical polymerizati…
Abstract A potentially inexpensive alternative epoxy resin system based on soybean oil has been developed for polymer composite applications. Epoxidized methyl soyate (EMS) and epoxidized allyl soyate (EAS) have been synthesized at the University of Missouri–Rolla. These materials consist of mixtures of epoxidized fat…
Specular X-ray reflectivity (XR) and quartz crystal microbalance (QCM) measurements were used to determine the absorption of water into thin poly(4-ammonium styrenesulfonic acid) films from saturated vapor at 25 degrees C. The effect of film thickness on the absorption kinetics and overall absorption was investigated…
High-resolution domain studies have been performed on $0.8\mathrm{Pb}({\mathrm{Mg}}_{1/3}{\mathrm{Nb}}_{2/3}){\mathrm{O}}_{3}\ensuremath{-}0.2{\mathrm{PbTiO}}_{3}$ (0.8PMN-0.2PT) single crystals via piezoresponse force microscopy (PFM). A complex structure consisting of micron-size domains comprising embedded nanodoma…
We studied thermochemical characteristics of the Sm1+xBa2-xCu3Oy single crystals by solution calorimetry. Dependences of formation enthalpies from samarium content were constructed. It was established that solid solutions on the bases of Sm123 could be decomposed both in inert and in oxygen atmosphere into different m…
The bending rigidity $k_c$ of bilayer vesicles self-assembled from amphiphilic diblock copolymers has been measured using single and dual-micropipet techniques. These copolymers are nearly a factor of 5 greater in hydrophobic membrane thickness $d$ than their lipid counterparts, and an order of magnitude larger in mol…
We have developed a fabrication process for nanoscale tunnel junctions which includes focused-ion-beam etching from different directions. By applying the process to a Nb/(Al-)Al_2O_3/Nb trilayer, we have fabricated a Nb single-electron transistor (SET), and characterized the SET at low temperatures, T=0.04-40 K. The s…
Functionalized anionic polystyrene latex particles with ATRP initiators were synthesized by surfactant-free shell-growth emulsion polymerization of styrene and 2-(2‘-chloropropionato)ethyl acrylate (HEA-Cl). N -Isopropylacrylamide (NIPAM) was polymerized from these particles by surface-initiated aqueous ATRP using PMD…
Electrospinning of biologically significant polymers (natural and synthetic polypeptides) has increased since electrospun membranes were identified as candidates for tissue engineering constructs. These materials have a specific secondary structure, which influences their properties. The effect of electrospinning on t…
Abstract Three types of mineral fillers—talc, calcium carbonate (CaCO 3 ), and kaolin (10–40 wt % filler loadings)—were compounded with polypropylene (PP) with a twin‐screw extruder. The composites were injection‐molded, and the effects of the filler loading on the mechanical, flow, and thermal properties for the thre…
Single-walled carbon nanotubes (SWNT) were functionalized with polystyrene (PSt) by grafting to and grafting from methods. PSt-N 3 with designed molecular weight and narrow molecular weight distribution was synthesized by atom transfer radical polymerization (ATRP) of styrene (St) followed by end group transformation…
An emulsion polymer (i.e., latex) has been used as the polymer matrix starting material in order to lower the percolation threshold of single‐walled‐carbon‐nanotube (SWNT)‐filled polymer composites (e.g., see Figure). A percolation threshold below 0.04 wt.‐% SWNT is achieved. This composite system offers the potential…
A new synthesis method to produce various organic‐dye‐doped silica nanoparticles using a reverse microemulsion has been developed. These nanoparticles show extremely high fluorescent signals (see Figure), excellent photostability, and size uniformity and tenability. These dye‐doped silica nanoparticles can be used for…
Stable colloidal suspension of magnetic nanoparticles is challenging owing to both van der Waals forces and magnetic dipolar interactions. Thus, it is essential to coat magnetic nanoparticles with a surfactant during chemical synthesis in order to prepare well-dispersed nanoparticle colloid. In the present study, coba…