Materials Literature
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Nanoporous carbon (NPC) exhibits unexplained chemical properties, making it distinct from other graphenelike materials, such as graphite, fullerenes, or nanotubes. In this Letter, we analyze the properties of NPC in terms of its structural motifs, which are derived from defects in distorted graphene sheets. Our densit…
The performance of photovoltaic and photochemical devices is directly linked to the efficiency with which absorbed photons are converted into electron-hole pairs (excitons). A usual assumption is that one photon produces a single exciton, while the photon energy in the excess of the material's energy gap (the gap that…
The seed-mediated approach to making gold nanorods in aqueous surfactant solutions has become tremendously popular in recent years. Unlike the use of strong chemical reductants to make spherical gold nanoparticles, the growth of gold nanorods requires weak reducing conditions, leading to an unknown degree of gold redu…
Abrasion is responsible for many surface changes that occur on garments. For this reason, the evaluation of its effects becomes very important for the textile industry. In particular, pilling formation is a phenomenon that results of the abrasion process and affects fabrics more significantly altering their surface se…
Abstract Lateral control of template synthesis in nanoporous alumina membranes (NAMs) was previously shown by us to enable preparation of graded composite materials. Formation of thickness gradients of Cu was demonstrated using electrodeposition (or electrodissolution) of Cu in the NAM template under a lateral voltage…
The development of a high-yield and low environmental impact synthesis able to deliver highly pure pergolide mesylate 1 is described. The process [seven chemical steps (four telescoped), three steps of isolation of intermediate, and only one drying] affords pergolide mesylate 1 in 75−81% overall yield from dihydrolyse…
We have studied the electronic structure of the oxygen-deficient type perovskite ${\mathrm{TbBaCo}}_{2}{\mathrm{O}}_{5.5}$, ${\mathrm{NdBaCo}}_{2}{\mathrm{O}}_{5.5}$, and ${\mathrm{NdBaCo}}_{2}{\mathrm{O}}_{5}$ using x-ray photoemission spectroscopy. The valence-band photoemission spectrum of ${\mathrm{TbBaCo}}_{2}{\m…
Abstract In this paper, deformation and breakup under simple shear of single molten polymer drops in a polymer matrix were investigated. Flow visualization was carried out in a Couette‐Flow apparatus under relatively high shear rates and temperatures up to 230°C. Drop/Matrix combinations were composed of polystyrene d…
Abstract Differential scanning calorimetry (DSC) was used to evaluate the thermal behavior and isothermal crystallization kinetics of poly(ethylene terephthalate) (PET) copolymers containing 2‐methyl‐1,3‐propanediol as a comonomer unit. The addition of comonomer reduces the melting temperature and decreases the range…
Charge-carrier transport in the columnar phase of the discotic liquid crystal, hexapentyloxytriphenylene, has been investigated by the time-of-flight technique over a range of temperatures and electric fields. The hole mobility was found to be temperature and electric-field-dependent with a maximum value of $2\ifmmode…
Abstract The iron mixed‐valence complex, ( n ‐C 3 H 7 ) 4 N[Fe II Fe III (dto) 3 ] (dto = dithiooxalato) shows a charge‐transfer (CT) phase transition at T CT = 122.4 K. In the vicinity of T CT , the spin state changes from Fe II ( S = 2) – Fe III ( S = 1/2) (high‐temperature phase: HTP) to Fe II ( S = 0) – Fe III ( S…
Abstract We studied the dielectric relaxation behavior of low mass compounds (LMC) mixed in polystyrene (PS). Specifically, LMCs that are used are alkyl‐cyanobenzene ( n CBz, n = 0), alkyl‐cyanobiphenyl ( n CB, n = 0, 1, 3, 5, and 7), and alkyl‐cyanoterphenyl ( n CT, n = 5), where n represents the number of carbon ato…
We report molecular dynamics simulations of the production of radiation cascades in pyrochlores. We consider the apparently similar systems Gd 2 Ti 2 O 7 , Gd 2 Zr 2 O 7 and Gd 2 Pb 2 O 7 , the first two of which have been put forward as potential materials for high-level radioactive waste storage. The effects of chan…
The homopolymer of butyl isopropenyl ether (pBPE) and a series of homo- and copolymers of BPE and decyl isopropenyl ether (DPE) with acrylates and methacrylates fluorinated on the vinyl and/or the alkoxy group were synthesized by cationic (pBPE) or free-radical process. The three structurally analogous 1,1,1,3,3,3-hex…
This paper investigates effects of using monodisperse inverse analyses to extract particle-particle and particle-surface potentials from simulated interfacial colloidal fluids of polydisperse attractive particles. Effects of polydispersity are investigated as functions of particle concentration and attractive well dep…
Molecular-dynamics simulations are utilized to simulate solvation forces between two nanoparticles immersed in a Lennard−Jones liquid. Four different sizes and shapes of solvophilic nanoparticles are investigated. For nanoparticles at a fixed orientation, we find that the solvation forces oscillate between attraction…
The segmental dynamics of bulk poly(methyl acrylate) (PMA) were studied as a function of molecular mass in the glass-transition region using 2H NMR and modulated differential scanning calorimetry (MDSC). Quadrupole-echo 2H NMR spectra were obtained for four samples of methyl-deuterated PMA-d3 with different molecular…
Layered cobaltates embody novel realizations of correlated matter on a spin-1/2 triangular lattice. We report a high-resolution systematic photoemission study of the insulating cobaltates. The observation of a single-particle gap opening and band folding provides direct evidence of anisotropic particle-hole instabilit…
Transmission electron microscopy and electron energy loss spectroscopy (EELS) were used to distinguish structural details for the cubic and uncommon monoclinic crystal phases of heavy metal rare earth oxide nanoparticles synthesized by a combustion process. Specifically, we systematically examined the EELS oxygen K ed…
A simple, productive and low-cost route has been developed to synthesize multi-armed CdTe nanorods using myristic acid (MA) as a complex agent. The yield of this approach can reach 75%. The dimension of the multi-armed nanorods can be controlled by tuning the molar ratios of Cd/Te and Cd/MA; the diameter can be change…