Materials Literature
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We report static and dynamic light-scattering measurements of aqueous glucose solutions near their glass transition. Photon correlation spectroscopy reveals two relaxation processes present in the supercooled liquid: a nonexponential and nonhydrodynamic, alpha -relaxation occurring at short times and an exponential an…
Abstract Polyurethane/polyaniline (PU/PANI) and polyurethane‐poly(methyl methacrylate)/polyaniline (PU‐PMMA/PANI) conductive core‐shell particles were synthesized by a two‐stage polymerization process. The first stage was to produce a core of PU or PU‐PMMA via miniemulsion polymerization using sodium dodecyl sulfate (…
The multiaxial fatigue loading in the high-cycle regime leads to localized mesoscopic plastic strain that occurs in some preferential directions of individual grains for most metallic materials. Crack initiation modeling is difficult in this fatigue regime because the scale where the mechanisms operate is not the engi…
Abstract Starting from 3,5‐diamino benzoic acid, 2‐hydroxy propyl[3,5‐bis{(benzoxycarbonyl)imino}]benzyl ether, an AB 2 ‐type blocked isocyanate monomer with flexible ether group, and 2‐hydroxy propyl[3,5‐bis{(benzoxycarbonyl)imino}]benzoate, an AB 2 ‐type blocked isocyanate monomer with ester group, were synthesized…
A C/SiC composite panel with defects of known size and of familiar nature was manufactured successfully for nondestructive evaluation. A computed tomography (CT) system was used to detect embedded defects. The results show that CT imaging corresponds well with the designed defects. The defect‐embedded composites under…
Three models of the kaolinite:dimethylsulfoxide intercalate with 25, 50, and 100% saturation of dimethylsulfoxide (DMSO) have been investigated by means of density functional theory (DFT, fully periodic approach). The analysis of interatomic distances was used to characterize interactions between DMSO molecules and ka…
In this contribution, we report the synthesis of CdS nanoparticles directly conjugated to an enzyme, α-chymotrypsin (CHT) by chemical reduction in aqueous solution. Matrix-assisted laser desorption ionization (MALDI) mass spectrometry confirms the strong conjugation of CdS nanoparticles to CHT through covalent bonding…
Phosphazenes (RNH)6P3N3 (R = n-propyl, isobutyl, isopropyl, cyclohexyl, tert-butyl, benzyl) are readily alkylated at ring N sites by alkyl halides forming N-alkyl phosphazenium cations. Alkylation of two ring N sites occurred after prolonged heating in the presence of methyl iodide or immediately at room temperature w…
We have previously reported the unique luminescence properties of ML4 complexes formed between tropolonate ligands and a series of lanthanide cations, several of them emitting in the near-infrared domain. The synthesis and composition of ML4 lanthanide tropolonate complexes have been previously described in the litera…
Let loose in the red-light district: “Caged” DNAs are described that can be activated by light of selectable wavelength. This is possible with, for example, red light, which is significantly less damaging than UV light and can permeate deeply into tissues (see scheme).
Cellulosic polymers namely cellulose, di‐and triacetate were produced from fourteen agricultural wastes; Branch and fiber after oil extraction from oil palm (Elais guineensis) , raffia, piassava, bamboo pulp, bamboo bark from raphia palm (Raphia hookeri) , stem and cob of maize plant (Zea mays) , fruit fiber from coco…
Thermoelectric devices can convert heat into useful electricity with no moving parts. Considerable progress has been made in improving the efficiency of these devices over the past 15 years. The key ideas responsible for most of this progress will be examined using specific examples. Recent improvements in thermoelect…
Abstract Due to being halogen‐free, non‐toxic, non‐erosive and environmentally friendly, melamine‐based flame retardants are attracting more and more attention. As a melamine‐based intumescent flame retardant, in this study the melamine salt of pentaerythritol phosphate (MPP) was prepared from melamine phosphate (MP)…
A plate‐shaped thermoelectric module was prepared using 140 pairs of p ‐type Ca 3 Co 4 O 9 (Co‐349) and n ‐type LaNiO 3 (Ni‐113) bulks. The hot‐pressed thermoelectric oxide bulks were connected with an Ag paste, incorporating oxide powder, and Ag sheets. The module's open‐circuit voltage increases with increasing hot‐…
The electrochemical growth current of poly( o -phenylenediamine) as well as its redox current were enhanced several-fold when deposited on a carbon nanotube modified glassy carbon electrode compared to the same at a glassy carbon surface. The current enhancements during the growth of the polymer were not due to any su…
Four-dimensional (4D) imaging during structural changes are reported here using ultrafast electron microscopy (UEM). For nanostructures, the phase transition in the strongly correlated material vanadium dioxide is our case study. The transition is initiated and probed in situ, in the microscope, by a femtosecond near-…
The pinene-bipyridine carboxylic derivatives (+)- and (-)-HL, designed to form configurationally stable lanthanide complexes, proved their effectiveness as chiral building blocks for the synthesis of lanthanide-containing superstructures. Indeed a self-assembly process takes place with complete diastereoselectivity be…
The formation of one-layer surface oxides on Pd(111) has been studied by scanning tunneling microscopy (STM) and density functional theory (DFT). Besides the ${\mathrm{Pd}}_{5}{\mathrm{O}}_{4}$ structure determined previously, structural details of six different surface oxides on Pd(111) will be presented. These oxide…
PURPOSE: To show the feasibility of using magnetic resonance imaging (MRI) to quantify superparamagnetic iron oxide (SPIO)-labeled cells. MATERIALS AND METHODS: Lymphocytes and 9L rat gliosarcoma cells were labeled with ferumoxides-protamine sulfate complex (FE-PRO). The cells were labeled efficiently (more than 95%)…
One-dimensional polymer [Tb(pzam)3(H2O)Mo(CN)8]⋅H2O (see picture, pzam=pyrazine-2-carboxamide; C black, Mo yellow, N blue, O red, Tb green) has been synthesized and characterized. Its magnetic susceptibility data indicate substantial ferromagnetic superexchange between TbIII and MoV via the cyanido bridge, and the occ…