Materials Literature
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Intramolecular crosslinking of benzylether-based dendrimers functionalized with electroactive carbazole peripheral groups is performed using both chemical and electrochemical methods. The changes in structure, rigidity, size, and conformation of the uncrosslinked and crosslinked precursor dendrimer nanoparticles are c…
Surfaces of sulfate-terminated polystyrene microspheres are anisotropically modified with silver nanoparticles covering 20-50% of the sphere surface using electroless deposition. A PDMS templating method is employed. Silver nanoparticles are found to deposit uniformly onto the exposed sphere surfaces. The deposition i…
This paper reports on an investigation into the formation of TiO(2) thin films, whereby X-ray diffraction is used to map systematic changes in preferred orientation and phase observed throughout the films. The key to this strategy is the recording of X-ray diffraction patterns of specific and isolated areas of a subst…
Polymer brushes comprising two different chemistries can induce motion of adsorbed nanometer-scale objects. Topographical variations of the brushes occurring along with nanometer phase separation after exposure to selective solvents result in variations of surface forces between the substrate and the adsorbed object,…
Shape-coded silica nanotubes (SNTs) were fabricated on the basis of template synthesis as a new dispersible microarray system. The template synthesis of shape-coded SNTs begins with the fabrication of a porous alumina film that has well-defined cylindrical pores with two or more different diameter segments by multiste…
Melt down! A meltable, amphiphilic carbon nanotube derivative was obtained in a two-step functionalization process whereby oxidation of the nanotube was followed by a surface reaction with a polyethylene glycol-substituted tertiary amine. The derivative underwent a reversible solid-to-liquid transition at 35 °C (see i…
Abstract Samples of an aerospace structural epoxy composite (8552/IM7) were subject to long‐term (≈ 1 year) thermal aging at temperatures of 70°, 120°, 170°, and 200°C (in air). The changes to the chemical and physicochemical structure of the composite were analyzed by a range of different techniques, including gravim…
Complex multilayered thin-film architectures are fabricated by sequentially stacking mesoporous and macroporous layers with varying structure and properties. A series of deposition–stabilization steps are used to sequentially deposit the component layers of the films in order to obtain interconnected systems with a pr…
Abstract We have synthesized a series of fully aliphatic polyimides (APIs) from bicyclo[2,2,2]oct‐7‐ene‐2,3,5,6‐tetracarboxylic dianhydride (BOCA) and various aliphatic diamines, including linear aliphatic, flexible alicyclic, and rigid adamantyl diamines. We performed the polymerization reactions using one‐step synth…
A new nanophase-separated structure with parallel double periodicity has been identified for an undecablock terpolymer in bulk. The polymer includes two long poly(2-vinypyridine) ($P$) chains on each end, with five short polyisoprene ($I$) and four short polystyrene ($S$) chains at the center. This polymer exhibits a…
Abstract The present article summarizes an experimental study on the mechanical and dynamic mechanical behavior of sisal fiber reinforced HDPE composites. Variations in mechanical strength, storage modulus ( E ′), loss modulus ( E ″), and damping parameter (tan δ) with the addition of fibers and coupling agents were i…
Microphase-ordered block copolymers serve as model systems to elucidate the potential of molecular self-assembly and organic templates to fabricate functionalized polymeric materials. Both aspects are related to the incorporation of secondary species such as low-molar-mass compounds or nanoparticles within the copolym…
The nanocluster literature contains a wide variety of nanocluster stabilizing agents. In addition to the plethora of putative stabilizing additives, 12 claims appear of "solvent-only" stabilization of transition-metal nanoclusters-a hypothesis that is tested for the first time as part of the present studies. When the…
Abstract Electrospinning of poly(3‐hydroxybutyrate) (PHB), poly(3‐hydroxybutyrate‐ co ‐3‐hydroxyvalerate) (PHBV), and their blends was first carried out in chloroform at 50 °C on a stationary collector. The average diameter of the as‐spun fiber from PHB and PHBV solutions decreased with increasing collection distance…
An exceptional evaporation pattern is observed on special micro–nano hierarchically structured superhydrophobic natural lotus and biomimetic polymer surfaces. The evaporation process is simulated by the ellipsoidal cap-geometry model, which fits the experimental data well. The picture shows the contact angle (CA) and…
Ultrathin polyelectrolyte gel pH-responsive membranes with sub-micrometer pore size are synthesized on planar substrates. The membranes are thin porous films made of a crosslinked polyelectrolyte that can be easily transferred onto various porous and nonporous substrates for the fabrication of devices with pH-controll…
We present evidence via molecular simulation that the supercooled fluid states of SPC/E water as well as the "repulsive" and "attractive" supercooled fluid states of a recently introduced model for colloids with short-ranged attractions are characterized by the same functional relationship between self-diffusivity and…
Abstract The crystallization behavior of PVDF (poly (vinylidene) fluoride) in PVDF‐dimethylphthalate(DMP) system was investigated in the liquid–liquid (L–L) phase separation region, solid–liquid (S–L) phase separation region and different quenching conditions via thermally induced phase separation (TIPS). Differential…
The dispersion of small-diameter single-walled carbon nanotubes (SWNTs) produced by the CoMoCAT method in tetrahydrofuran (THF) with the use of amine was studied. The absorption, photoluminescence, and Raman spectroscopies showed that the dispersion and centrifugation process leads to an effective separation of metall…
Composite nanostructures (approximately 200 nm wide and several micrometers long) of metal and polyaniline (PANI) in two new variations of core-shell (PANI-Au) and segmented (Au-PANI and Ni-Au-PANI) architectures were fabricated electrochemically within anodized aluminum oxide (AAO) membranes. Control over the structu…