Materials Literature
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Abstract In this article, the spherulitic growth rate of neat and plasticized poly(lactic acid) (PLA) with triphenyl phosphate (TPP) was measured and analyzed in the temperature range of 104–142°C by polarizing optical microscopy. Neat PLA had the maximum value of 0.28 μm/s at 132°C, whereas plasticized PLA had higher…
A simple and spontaneous one-pot self-formation procedure that is easy to scale up has been developed based on the chemistry of trimethylaluminum (TMA), leading to thermally stable macroporous crystalline alumina with a very unique and unprecedented three-dimensional (3D) hierarchical pore structure consisting of well…
Many potential biological applications of single-walled carbon nanotubes (SWNTs) require their dispersion in aqueous conditions. Recently, Dieckmann et al. designed a series of reversible cyclic peptides (RCPs) which exist in linear or cyclized states through controlled formation of an intramolecular disulfide bond be…
Using a collection of 12 semiconducting carbon-nanotube samples, each highly enriched in a single chirality, we study the chirality dependence of the $K$-momentum dark singlet exciton using phonon sideband optical spectroscopy. Measurements of bright absorptive and emissive sidebands of this finite momentum exciton id…
Using first-principles calculations, we systematically investigated electronic structures of ZnO nanowires of various sizes modified with different surface coverages of H, F, Cl, NH 2, and NH 3 . We found that the 50% H(O), 50% F(Zn); 100% F; 50% H(O), 50% Cl(Zn); and 50% NH 3 (Zn) passivations are energetically very…
Molecular dynamics simulations are performed to investigate the structural and dynamic properties of water molecules close to clean gold nanoclusters and four different Monolayer Protected Clusters (MPCs) comprising gold nanoclusters and alkanethiol surfactants with methyl, carboxyl, amine and hydroxyl tail group. The…
Abstract Biobased nanocomposites and composite fibers were prepared from organosolv lignin/organoclay mixtures by mechanical mixing and subsequent melt intercalation. Two organically‐modified montmorillonite (MMT) clays with different ammonium cations were used. The effect of organoclay varying from 1 to 10 wt % on th…
We compare several alternative approaches for computing the stress field of a straight dislocation segment and its forces on other segments in an anisotropic linear elastic medium. The Willis–Steeds–Lothe expression can be implemented faster than Brown's formula and the matrix formalism is only slightly faster than th…
The site preference and magnetic properties of Zn–Sn substituted strontium ferrite SrFe12−x(Sn0.5Zn0.5)xO19 particles with x=0–5 were studied using both F57e and S119n Mössbauer spectroscopies and magnetic measurements. The results show that the magnetization and magnetocrystalline anisotropy are closely related to th…
A continuous Couette−Taylor (CT) crystallizer exploiting a Taylor vortex was developed to promote the phase transformation of guanosine 5-monophosphate (GMP). In drowning-out crystallization, amorphous GMP is initially generated and then transformed into hydrate GMP crystals via the consecutive dissolution of the amor…
Porous cross-linked poly(N-isopropylacrylamide) (PNIPAM) was prepared using high internal phase emulsions as templates. The materials could absorb a large volume of water and swell largely at room temperature. When the aqueous phase was heated above the lower critical solution temperature (LCST) of PNIPAM, the swollen…
We present results from an experimental study of ordering characteristics in monolayers of polystyrene nanospheres self-assembled at a water-air interface. We demonstrate that the interaction of spheres, governed by the dissemination of surface charge, leads to the formation of macroscopic close-packed ordered areas o…
A novel ABA triblock copolymer containing electroactive tetraaniline [(ANI)(4)] and poly(ethylene oxide) (PEO600, M(n) = 600), (ANI)(4)-b-PEO600-b-(ANI)(4), was synthesized by coupling tetraaniline and PEO600 with tolylene 2,4-diisocyanate. FTIR, NMR, and UV-vis spectroscopy were combined to characterize the chemical…
Reports concerning solution-mediated polymorphic transformation are reviewed with regard to the mechanism observed in each transformation. A polymorphic transformation is initiated by nucleation of the second phase. It is observed in the reviewed journal articles that nucleation of the second phase in a solution-media…
Electron backscatter diffraction (EBSD) is a widely available and relatively easy-to-use scanning-electron-microscopy-based diffraction technique. Recently, Wilkinson, Meaden, and Dingley presented two papers on a new cross-correlation-based analysis of EBSD patterns which allow variations in the elastic strain and la…
In this study, we report a novel approach for glucose-triggered anticancer drug delivery from the self-assembly of neutral poly(vinyl alcohol) (PVA) and chitosan. In the present study, we have fabricated multilayer thin film of PVA-borate and chitosan on colloidal particle (MF particle) and monitored the layer-by-laye…
It has recently been demonstrated that graphene nanoribbons can be mass-produced by unzipping carbon nanotubes. At present, wet chemical routes via acid oxidation appear to be the most effective and scalable. Although it was believed that this route resulted in highly defective nanoribbons with low electrical transpor…
Two new polar noncentrosymmetric (NCS) oxides, Rb 2 (MoO 3 ) 3 (SeO 3 ) and Tl 2 (MoO 3 ) 3 (SeO 3 ), have been synthesized and characterized. The materials exhibit the layered hexagonal tungsten oxide (HTO) structural topology—Class 2, i.e., the MoO 6 layers are “capped” on one side by the SeO 3 polyhedra. The Rb + a…
A particularly stable thiolate-protected gold nanocluster, Au 25 (SR) 18, was structurally characterized from X-ray crystallography in 2008, and concomitantly its electronic and optical properties were analyzed via density functional theory. The robust geometry and a well-understood electronic structure of this cluste…
Abstract This research presents the foaming behaviors of linear polypropylene (PP) and PP/clay nanocomposites blown with supercritical CO 2 . The cell nucleation and expansion behaviors of the linear PP and PP‐based nanocomposites at various clay contents during extrusion foaming are studied. The experimental results…