Materials Literature
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To include particle attachment and porosity of nanostructured materials in the discussion of their electronic properties is critical to our understanding of charge transfer across grain boundaries. We report the condensation of isolated TiO(2) nanocrystals via the application of a simple hydration-dehydration cycle. A…
Long-range-ordered anodic porous alumina with a reduced hole interval could be obtained by anodization using highly concentrated H 2 SO 4 solutions. The self-ordering of the hole arrangement of alumina occurred at a low applied voltage of 18 V in highly concentrated H 2 SO 4 solution of more than 6 M, which generated…
Formation energies of possible vacancies under different oxygen partial pressures were studied using an ab initio density functional theory and supercell approach. Under oxygen-rich conditions, lead vacancies are the stable ones throughout the band gap, and their ionization level locates at 0.56eV from the top of vale…
Solute friction is known to prevail in crystals where a solution of point defects results in a diffuse resistance to dislocation motion. This property is often used to strengthen materials. In this paper we show that it also affects dislocation–dislocation interactions. Dislocation dynamics simulations are used to inv…
Abstract A series of polyurethaneurea (PUU) aqueous dispersions were prepared via a prepolymer process from polyester polyol, α,ω‐dihydroxypoly[(3,3,3‐trifluoropropyl) methylsiloxane] (PTFPMS), dimethylolpropionic acid, isophorone diisocyanate, and ethylenediamine. These anionic‐type aqueous dispersions were stable at…
Abstract Maleated natural rubber (MNR) was prepared and used to formulate thermoplastic vulcanizates (TPVs) based on various MNR/PP blends. The influence of mixing methods on the TPVs properties was first studied. We found that mixing all ingredients in an internal mixer provided the TPVs with better mechanical proper…
Abstract Rheological behavior of reactively extruded starch–PCL nanocomposite blends was evaluated in an off‐line capillary rheometer. Power law models for blends with different nanoclay volume fractions were developed using appropriate correction factors. Consistency coefficients K for blends containing starch were s…
Abstract The 1,3,5‐triazines 9 – 11 having OPV chains in the 2‐, 4‐ and 6‐position represent star‐shaped compounds which exhibit strong push‐pull effects. Their long‐wavelength absorption S 0 → S 1 is characterized by an intramolecular charge transfer (ICT) from the dialkylamino group as electron donor D via the conju…
Abstract The effect of Mo → Nb substitution on the electronic structure of MoS 2 nanotubes has been investigated using the density functional tight binding method (DFTB). It has been found that composite Mo 1– x Nb x S 2 nanotubes (with Nb contents of 5, 10 and 25 at%) are more stable than the corresponding pure tubes…
A facile chemical approach to enhance the photoluminescence of poly(2-methoxy-5-propyloxysulfonate-1,4-phenylenevinylene) (MPS-PPV) by alternately incorporating the rigid p -phenylenevinylene comonomer units into the conjugated backbone is reported. In dilute aqueous solution the resulting anionic conjugated copolymer…
Layered double hydroxides containing Ni 2+ and Al 3+ have been synthesized by homogeneous precipitation through urea hydrolysis. The nature of the interlayer species changes according to the treatment of the samples, formation of interlayer (NH 2 )COO - species being observed immediately after precipitation, which und…
Spherical PbSe@SiO2 nanoparticles have been successfully synthesized within reverse micelles via metal alkoxide hydrolysis and condensation within a microemulsion system. These core-shell nanoparticles were characterized by transmission electron microscopy (TEM), NIR absorption spectroscopy, energy-dispersive X-ray an…
The low-temperature $(<60\phantom{\rule{0.3em}{0ex}}\mathrm{K})$ transport properties of as-grown ${\mathrm{La}}_{0.7}{\mathrm{Sr}}_{0.3}\mathrm{Mn}{\mathrm{O}}_{3}$ ultrathin films, deposited by the molecular beam epitaxy, have been investigated as a function of the sample thickness (from $40\phantom{\rule{0.3em}{…
Starting from a microscopic lattice model, we investigate clustering, micellization, and micelle ordering in semidilute solutions of AB diblock copolymers in a selective solvent. To bridge the gap in length scales, from monomers to ordered micellar structures, we implement a two-step coarse-graining strategy, whereby…
Molecular simulations for hydrogen physisorption with corannulene molecules arranged according to their crystal structure result in good agreement with the weight-percent hydrogen stored as determined experimentally employing a 3-g sample of highly crystalline corannulene at ambient temperatures and 72 bar of pressure…
We report a soft and template-free electrochemical deposition method to prepare wafer-scale high-quality ZnO nanoneedle arrays on oriented gold-film-coated silicon substrates at temperatures as low as 70 °C. SEM, XRD, and TEM data show that the ZnO nanoneedles are of single-crystal wurtzite structure and preferentiall…
Abstract This paper investigates the effect of rheological behavior on dynamics of bubble coalescence. In situ observations on polymers with different rheological behaviors were conducted to study coalescence dynamics. Four patterns of interface deformation were observed. Deformation during coalescence was analyzed by…
The sonochemically driven synthesis of CdSe quantum dots (QDs) and their subsequent sonochemical ZnS shelling is described. By adapting the use of Cd(OAc) 2, TOPO, and hexadecylamine to an ultrasound-driven synthesis and by applying a subsequent sonochemical ZnS shelling procedure to CdSe QD cores using Zn-ethylxantha…
The crystal structures and photochromic performance of a single crystal of a diarylethene derivative possessing carboxyl groups, 1,2-bis(5-carboxyl-2-methyl-3-thienyl)perfluorocyclopentene (1 a), and cocrystals of 1 a with 4,4'-, 2,4'-, and 2,2'-bipyridines were examined. In crystal 1 a, a discrete cyclic structure wa…
Block copolymer (BC) brush gradient libraries were examined as high-throughput platforms to study the effect of relative block lengths on the response to solvents. BC brushes of poly( n -butyl methacrylate) (PBMA) and poly(2-( N,N ‘-dimethylamino)ethyl methacrylate) (PDMAEMA) were synthesized via surface-initiated ato…