Materials Literature
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A model is presented for the colloidal synthesis of semiconductor nanocrystals capturing the reactions underlying nucleation and growth processes. The model combines an activation mechanism for precursor conversion to monomers, discrete rate equations for formation of small-sized clusters, and continuous Fokker-Planck…
It is inevitable that carbon nanotubes (CNTs) will be released to and widely dispersed in environmental ecosystems, given their numerous expected applications. Determination of their potential for bioaccumulation by ecological receptors is thus critical. Previous, research involving several different terrestrial and b…
We demonstrate that photochromism based on light-driven reversible bond cleavage can enable rapid coloration upon UV light irradiation and successive fast thermal bleaching within tens of milliseconds at room temperature. We have succeeded in developing a bisimidazole derivative with a paracyclophane moiety, pseudogem…
Polyhydroxyalkanoates (PHAs) are naturally occurring organic polyesters that are of interest for industrial and biomedical applications. These polymers are synthesized by most bacteria in times of unbalanced nutrient availability from a variety of substrates and they are deposited intracellularly as insoluble spherica…
Mixed-metal oxides play a very important role in many areas of chemistry, physics, materials science, and geochemistry. Recently, there has been a strong interest in understanding phenomena associated with the deposition of oxide nanoparticles on the surface of a second (host) oxide. Here, scanning tunneling microscop…
An effective method was developed for separating gold-nanoparticle clusters in high resolution; dimer and trimer samples were obtained with 95% and 81% purity, respectively.
In this report, graphene nanoplatelets were self-assembled through the layer-by-layer (LBL) method. The graphene surface was modified with poly(acrylic acid) and poly(acryl amide) by covalent bonding, which introduced negative and positive charge on the surface of graphene, respectively. Through electrostatic interact…
Heterogeneous palladium catalysts, which are supported on ordered mesoporous silica-carbon nanocomposites, have been applied in water-mediated coupling reactions of chlorobenzene without assistance of any phase-transfer catalysts. Characterization by XRD, TEM, N(2) sorption, FT-IR, TG, XPS, and H(2) chemisorption tech…
Dumbbell-like Au-Fe(3)O(4) nanoparticles (NPs) were made and coupled with Herceptin and a platin complex. The platin-Au-Fe(3)O(4)-Herceptin NPs act as a target-specific nanocarriers for delivery of platin into Her2-positive breast cancer cells (Sk-Br3) with strong therapeutic effects. The conjugate has a half-maximal…
Statistical mixture designs are used to systematically study the densification properties of silicon carbide (SiC) ceramics sintered with SiO 2 , Dy 2 O 3 , and Al 2 O 3 . Mixture models for percentage theoretical density and SiC weight loss as a function of the SiO 2 , Dy 2 O 3 , and Al 2 O 3 oxide proportions have b…
Cyclic allyl phosphonated monomers were synthesized by transesterification reaction between a glycol bearing a double bond and a hydrogenophosphonate and were fully characterized by NMR and IR spectroscopy. Radical homopolymerization of these monomers was carried out at 70 °C in the presence of α,α ′- azoisobutyronitr…
Monte Carlo simulation and theory were used to study the potential of mean force (PMF) between a pair of big colloidal (solute) particles suspended in a sea of smaller particles (solvent) interacting via Baxter's sticky hard sphere (SHS) potential. Simulation results were obtained by applying a special simulation tech…
This study aims to fundamentally understand the polymer network formed by poly(ethylene glycol) diacrylate (PEGDA) MW 700 and 3-methoxypropylamine (3MOPA) as well as to characterize the degradation response of this material with and without applied cyclic stress. Macromer reaction chemistry was confirmed by (1)H NMR m…
In order to determine the enthalpy change in an irreversible field-induced phase transition, the thermal response to an electric field in 0.87Pb(Mg1/3Nb2/3)O3−0.13PbTiO3 was measured and dismantled into characteristic dielectric hysteresis, reversible electrocaloric, and irreversible phase transition responses. Below…
Magnetostriction can be used to induce linear incremental motion, which is effective in giant magnetostrictive inchworm motors. Such motors possess the advantage of combining small step incremental motion with large force. However, continuous rotation may be preferred in practical applications. This paper describes a…
Negative A-plates fabricated by mechanically stretching polystyrene are studied and their physical properties evaluated. A molecular model is developed to explain the underlying physical mechanisms. An example of a broadband wide-view liquid crystal display including a negative A-plate for phase compensation is illust…
Abstract We found that enhanced exfoliation of clay up to 20 wt.‐% in non‐polar polybutadiene (PB) if the PB was blended with a relatively small fraction of hydroxyl‐terminated PB (HTPB). The choice of an intermediate polymer composition to enhance exfoliation was motivated by theoretical predictions of end‐functional…
Abstract For 2,6‐dimesitylphenylsilanetriol ( 1 ), the nature of the solvent can control the structural motif in the solid state even without incorporation of the solvent into the structure. Silanetriol 1 , for which an improved synthesis is reported, provides additional donor sites within the molecule which are able…
Fluxmetric and transmission line methods have been combined in the wideband characterization of Mn–Zn and Ni–Zn soft ferrites. The real μ′(f) and imaginary μ″(f) permeability components and the energy loss W(Jp,f) have been obtained in ring samples, for defined values of the peak polarization Jp up to 1 GHz. The role…
The magnetic properties of (ZnO)1/(CuO)1 (001) superlattice have been investigated by means of ab initio calculations based on spin density functional theory. The ZnO/CuO superlattice is found to be spin polarized, and the calculated band structure suggests a 100% polarization of the conduction carriers. The analysis…