Materials Literature
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Abstract Oriented high‐density polyethylene (HDPE), prepared by melt extrusion drawing, has been employed to address the correlation between cavitation and lamellar fragmentation at large strain. This has been done by investigating the volume strain, elastic recovery properties, and microscopic morphology. The results…
Abstract Low molecular weight chitosan with weight‐average molecular weight from 161 to 22,000Da were obtained by sonolysis. Optimal conditions for sonolysis were described. The influence of sonolysis condition and the molecular parameters of initial chitosan on the degradation rate and degradation rate constant were…
The electrochemical regeneration of an activated carbon cloth exhausted with a common herbicide (bentazone) was investigated under different operating conditions. The reversibility of the desorption process was confirmed by monitoring the UV spectra of the solution while cathodic polarization is being applied. Neither…
Abstract Sodium benzoate (SB), a conventional nucleating agent of α‐phase isotactic polypropylene (iPP) was discovered to induce the creation of β‐phase iPP under certain crystalline conditions. Polarized optical microscopy (POM) and wide angle X‐ray diffraction (WAXD) were carried out to verify the versatile nucleati…
Abstract In this second part of a series of studies on polypropylene (PP) fibers having improved fire performance and containing nanodispersed clays we build on the observations of the first part of this work (published in Journal of Applied Polymer Science), where the need to improve dispersion of nanoclays is the ke…
Direct pyrolysis of a self-assembled inorganic−organic block copolymer can be a promising route for fabricating the ordered ceramic nanostructures based on the achievements of organic−organic block copolymers. Here we report the synthesis of a novel polycarbosilane- block -polystyrene diblock copolymer by ring-opening…
To prevent the dissociation of organic ligands from the inorganic core and accordingly enhance colloidal stability, is the prerequisite for the further application of nanocrystals in different areas. Dihydrolipoic acid (DHLA) appears very promising for the stabilization and the further functionalization of CdTe nanocr…
The use of bacterial flagella as templates for the immobilization of Pd and Au nanoparticles is described. Complete coverage of D. desulfuricans flagellar filaments by Pd(0) nanoparticles was obtained via the H(2)-mediated reduction of Pd(NH3)4]Cl2 but similar results were not obtained using HAuCl4. The introduction o…
Polarization of low-lying excitonic bands in finite-size semiconducting single-walled carbon nanotubes (SWNTs) is studied by using quantum-chemical methodologies. Our calculations elucidate properties of cross-polarized excitons, which lead to the transverse optical absorption of nanotubes and presumably couple to int…
The paper reports on the possibility of short- and long-range plasmon sensing using transmission UV/vis spectroscopy. The influence of silicon oxide (SiO x ) overlayers (0–310 nm), deposited on glass coated with gold nanostructures (formed by thermal evaporation and post-annealing at 500 °C) modified glass interfaces,…
We report the exact solution of the spectral problem for a graphene sheet framed by two armchair- and two zigzag-shaped boundaries. The solution is found for the pi electron Hamiltonian and gives, in particular, a closed analytic expression of edge-state energies in graphene. It is shown that the lower symmetry of gra…
Abstract Two series of biodegradaable polyvinyl alcohol (PVA)/starch blends, i.e., PVA with/without plasma treatment (PP/P series), were produced by single‐screw extruder. The influences of plasma pretreatment and PVA content on the tensile properties, thermal behaviors, melt flow index, and biodegradability of blends…
In this study, thin-film samples of semicrystalline block copolymer (BCP), polystyrene- b -poly( l -lactide) (PS−PLLA), were prepared by solution-casting from dichloromethane solution (1 wt % of PS−PLLA). As observed by polarized light microscopy (PLM), banded spherulites can be found in the PS−PLLA thin-film samples…
The hydrogen storage reaction ScH 2 + 2LiBH 4 → ScB 2 + 2LiH + 4H 2 (8.91 wt %), based on the thermodynamic destabilization of LiBH 4, is predicted to have a reaction enthalpy of Δ H 300K = 34.1 kJ/mol H 2 . The isothermal kinetic desorption behavior in this system was measured. At temperatures up to 450 °C, less than…
The Aurivillius compound ${\mathrm{Bi}}_{4}{\mathrm{Ti}}_{3}{\mathrm{O}}_{12}$ exhibits a single phase transition from a tetragonal high-temperature phase to a ferroelectric state. By means of first-principles calculations guided by a complete symmetry analysis of the experimental distortion, we confirm $B1a1$ as the…
A route for producing polyaniline nanotubes using the inner eggshell membrane as a template is demonstrated. Because the template substitutes the inner eggshell membrane with the outer eggshell membrane in the same reaction process, the resulting morphology of polyaniline correspondingly changes. A series of experimen…
A polyHIPE is a cross-linked, porous polymer synthesized through polymerization in the external phase of a high internal phase emulsion (HIPE). Crystalline polyHIPE polymers were synthesized through copolymerization of stearyl acrylate and divinylbenzene (DVB). Polymerizations initiated at the water/organic interface…
PACS: 71.35.Cc, 71.15.Mb, 78.20.-e.-- A Comment on the Letter by B. Arnaud et al., [Phys. Rev. Lett. 96, 026402 (2006).
We have investigated the effects of atomic disorder on the electronic structure and some physical properties of ${\text{Co}}_{2}\text{CrAl}$ Heusler alloy (HA) films. Flash evaporation onto glass substrates at different temperatures (from 150 to 750 K) and postannealing at various temperatures were employed to manipul…
Dispersion and exfoliation of carbon nanotubes (CNT) by water soluble dispersants such as surfactant, polymer or protein is a key step toward the application of carbon nanotubes in composite materials, biochemical and biomedical applications. Upon dispersion, the solution phase separates into dispersed nanotubes in th…