Materials Literature
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The effect of nanoclay content on the mechanism governing nanoclay dispersion was investigated through studying the interaction between nanoclay content and other factors. We hypothesized that at low nanoclay content, the dispersion was diffusion controlled; thus, increasing thermal diffusion and residence time, even…
The effect of the incorporation of three different surface modified silicas on the final properties of poly(vinyl acetate) (PVAc) latex based wood adhesives is assessed. It is shown that the compatibility and reactivity of the silica with the polymer determines its state of dispersion throughout the polymer matrix. Wh…
Fully dense β-SiC ceramic has been sintered at low temperature (1500 °C) by spark plasma sintering (SPS) with Y4Al2O9 (YAM) and Y2O3 as additive. The sintered SiC samples have an interlocking and laminated microstructure of elongated grains, and reveal excellent mechanical properties. High hardness (31.2±1.54 GPa) and…
Co‐ and Mn‐doped ZnO quantum dots (QDs) with ZnO/Zn(OH)2 core–shell structure were studied using high‐frequency electron paramagnetic resonance (EPR), electron spin echo, and electron‐nuclear double resonance (ENDOR) at low temperature. The shape of the EPR spectrum of cobalt ions was observed to change as a result of…
Novel partially phosphonated polyethylenimine polymers are developed in order to control the modification of nanoparticle (NP) surfaces. This polymer is built by an accessible one‐step process. The numerous phosphonate functions assume both a strong covalent anchoring on metal oxide NPs and a modulation of electric ch…
The effects of phonon confinement and exciton–phonon coupling (EPC) in three-dimensional (3D) assemblies of CdSe quantum dots with zincblende structure, synthesized by colloidal chemical and sonochemical routes as well as in postdeposition thermally treated samples, were studied by resonant Raman scattering (RRS) tech…
Aqueous sols of colloidal layered tetramethylammonium (TMA) tungstate nanocrystals were obtained by diluting an aqueous suspension of TMA polyoxotungstate precipitates. The slow evaporation of the colloidal-layered tungstate sols led to the deposition of TMA polyoxotungstate and significantly decreased the amount of l…
The redox pair [(μ-abcp){Cu(dppf)} 2 ] 2+/+ (abcp = 2,2′-azobis(5-chloropyrimidine) and dppf =1,1′-bis(diphenylphosphino)ferrocene) has been structurally characterized to reveal the lengthening of the NN and shortening of the CN azo bonds on reduction, each by about 0.04 Å. These and other charge forms, [(μ-abcp){Cu(d…
Supramolecular assemblies formed by amphiphilic homopolymers with negatively charged groups in the hydrophilic segment have been designed to enable high labeling selectivity toward reactive side chain functional groups in peptides. The negatively charged interiors of the supramolecular assemblies are found to block th…
The dielectric properties of polymethylmetacrylate (PMMA) composites filled with CVD made multiwalled carbon nanotubes (MWCNT) of different mean outer diameters (d ∼ 9 nm and 12–14 nm) were investigated in the temperature range from 300 to 420 K and in a wide frequency range (20 Hz to 1 MHz). Below the percolation thr…
Although nanotechnology advancements should be fostered, the environmental health and safety (EHS) of nanoparticles used in technologies must be quantified simultaneously. However, most EHS studies assess the potential implications of the free nanoparticles which may not be directly applicable to the EHS of particles…
We report the results of low-temperature heat capacity measurements of the pnictide oxide superconductor BaTi${}_{2}$Sb${}_{2}$O doped with sodium. The temperature- and field-dependent heat capacity data are well described by a single-gap BCS theory. The estimated values for the normal-state Sommerfeld constant, the h…
A method to form ordered mesoporous silica based on the use of folate supramolecular templates has been developed. Evidence based on in situ small-angle X-ray scattering (SAXS), electron microscopy, infrared spectroscopy, and in situ conductivity measurements are used to investigate the organic-inorganic interactions…
Viscoelasticity and strain-induced birefringence under oscillatory shear flow of cellulose/1-buthyl-3-methylimidazolium chloride (BmimCl) solutions were measured at various temperatures covering a wide frequency zone from the terminal flow to the glassy zone for dilute (2 wt %) and semiconcentrated solution (10 wt %)…
Synthesis of 2,7-disubstituted tetramethoxypyrene-based neutral biradical donors is reported. The biradicals were characterized by EPR, UV-vis, CV, SQUID, and single-crystal X-ray diffraction, and their optical, electrochemical, and structural properties were compared and discussed. The experimental results are well s…
Quinary chalcogenide compounds Cu2.1Zn0.9Sn1−xInxSe4 (0 ≤ x ≤ 0.1) were prepared by melting (1170 K) followed by annealing (773 K) for 172 h. Powder X-ray diffraction (XRD) data accompanied by electron probe microanalysis (EPMA) and Raman spectra of all the samples confirmed the formation of a tetragonal kesterite str…
Amino group and methyl group functionalized nano‐silica (coded as RNS and DNS) particulates were separately used as nanofillers to prepare polyxymethylene‐matrix (denoted as POM‐matrix) nanocomposites by melt blending. The tensile strength, Young's modulus, and impact toughness of as‐prepared POM‐matrix nanocomposites…
A new layered organic-inorganic nanohybrid material, zinc-aluminum-3,4-dicholorophenoxyacetate (N3,4-D) in which an agrochemical, 3,4-dichlorophenoxyacetic acid (3,4-D), is intercalated into zinc-aluminum-layered double hydroxide (ZAL), was synthesized by coprecipitation method. A well-ordered nanomaterial was formed…
Infrared (IR) spectroscopy is an important means to study the atomic structure of graphene oxide (GO). In this study, computational simulations of GO IR spectra are carried out. The widely accepted Lerf model gives most experimental IR characteristics correctly except the strong C=O stretching peak. This is a result o…
We report on the measurements of nonequilibrium carrier dynamics in monocrystalline diamond prepared by the chemical vapor deposition (CVD) technique. Nonlinearly excited laser‐induced transient grating (LITG) and time‐resolved photoluminescence (PL) were used for investigation of carrier diffusion and recombination.…