Materials Literature
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When sufficient force is applied to a glassy polymer, it begins to deform through movement of the polymer chains. We used an optical photobleaching technique to quantitatively measure changes in molecular mobility during the active deformation of a polymer glass [poly(methyl methacrylate)]. Segmental mobility increase…
Between the sheets: Polystyrene–polyacrylamide copolymer is covalently grafted onto graphene sheets by in situ living free-radical polymerization to give “amphiphilic” graphene nanoplatelets. The block copolymer disperses graphene nanoplatelets in a polar solvent (water; see picture, A versus C) and also stabilizes th…
The ever-increasing demand for energy coupled with dwindling fossil fuel resources make the establishment of a clean and sustainable energy system a compelling need. Hydrogen-based energy systems offer potential solutions. Although, in the long-term, the ultimate technological challenge is large-scale hydrogen product…
MRI jack-o'-lanterns? Hollow manganese oxide nanoparticles (HMON) show greatly improved relaxivities and drug-loading capacities compared to those with solid interiors (WMON). Their efficient cellular uptake demonstrates their potential as a bifunctional medical system that combines diagnostic imaging and targeted the…
Porous silicon (PS) has been prepared by anodic etching of boron doped silicon under the influence of monochromatic light illumination. The optical properties of the PS samples have been investigated using temperature dependent photoluminescence (PL) spectroscopy. An overall enhancement of the infrared luminescence yi…
N-Carbamoyl-L-amino-acid amidohydrolases (L-N-carbamoylases; EC 3.5.1.87) hydrolyze the carbon-nitrogen bond of the ureido group in N-carbamoyl-L-alpha-amino acids. These enzymes are commonly used in the production of optically pure natural and non-natural L-amino acids using the ;hydantoinase process'. Recombinant L-…
The heteroligand complex Nd(Phen){(iso-C4H9)2PS2}2(NO3) (I) was synthesized and its IR spectrum was analyzed. The anions (iso-C4H9)2PS2/− and N3/− act as bidentate cyclic ligands. The single crystals of [Nd(Phen){iso-C4H9)2PS2}3] (II) were obtained on evaporation of a solution of complex I in a mixture CH2Cl2-hexane a…
The creep behavior of high-density polyethylene has been studied by low compressive creep tests, and empirical results were analyzed and compared with analytically predicted results. The tests are performed upon ASTM standard specimens at various stress levels in the linear region. After these analyses, a mathematical…
A single-step, room temperature photolithographic route to fabricate periodic metallodielectric microstructures is reported. Ag nanoparticles in organosiloxane sols were first generated through the well-established method of AgCl photoreduction. Evolution of the shape, size and distribution of Ag nanoparticles in the…
Three different hyperbranched polymers (H1, H2, and H3) were prepared. The H1 and H2 are hyperbranched polyesteramide polymers; however, H3 is a poly(urea-urethane) hyperbranched polymer. The three polymers were treated with Br-ended surfactant units, which were prepared via simple reaction of Tergitol Np-50 (S) as su…
The p-n -hexyloxybenzoic acid ( I )- p-n -heptyloxybenzoic acid ( II ) system was investigated by thermal and X-ray phase analyses and dielcometry. Solid solutions of three types were found in the low-temperature region of the system, namely, solid solution based on I (up to 15 mol % II ); solid solution based on a co…
Abstract Dinuclear Rh II compounds [Rh 2 (μ‐OOCCH 3 ) 2 (dmbpy) 2 (H 2 O) 2 ](CH 3 COO) 2 ( 1 ) and [Rh 2 (μ‐OOCCH 3 ) 2 (dmbpy) 2 (H 2 O) 2 ](BF 4 ) 2 · 2.5H 2 O ( 2 ) (dmbpy = 4,4′‐dimethyl‐2,2′‐bipyridine) were synthesized and characterized with spectroscopic methods. The structure of complex 2 was determined by us…
Dimming high-intensity discharge (HID) lamps is often proposed as part of energy management schemes for lighting installations. However, the impacts of dimming on HID lamp performance are not well characterised. The impacts of operating 150W ceramic metal halide discharge (CMH) lamps for prolonged periods (up to 11 00…
To investigate the effects of specific porous microstructure of diatomite on the hydrogen storage properties of MgH(2), a two-step preparation was carried out. The first step was decrepitation of MgH(2) particle size during 10 h of milling. The second step was additional 1 h of milling with diatomite. The microstructu…
Bagasse fiber is a residue of the sugar cane milling process. In this research bagasse fiber has been used as a reinforcing component in epoxy resin to open up further possibilities in waste management. The chemical treatment acetylation was carried out to modify the fiber properties. The effect of fiber treatment on…
Glass—sisal (treated and untreated) composites of mixed matrix material (25 wt% epoxy resin of bisphenol-C (EBC) and 25 wt% bisphenol-C-formaldehyde (BCF) of glass—sisal fibers) were prepared by hand lay-up technique at 150°C under 7.6 MPa pressure for 2 h. Hydrophilic character of the sisal fibers was reduced by acry…
The transformation media concept based on the form-invariant Maxwell's equations under coordinate transformations has opened up new possibilities of manipulating electromagnetic (EM) fields. In this paper, we report on application of the finite-embedded coordinate transformation method to the design of EM beam-modulat…
Comparison was made between properties of recycled newspaper (RNP)/carbon black (CB) and recycled newspaper (RNP)/silica hybrid filled polypropylene (PP)/natural rubber (NR) composites. The properties of composites consisting of processing characteristics, mechanical properties, thermal analysis via thermogravimetric…
Dihydrodipicolinate synthase (DHDPS) mediates the key first reaction common to the biosynthesis of (S)-lysine and meso-diaminopimelate, molecules which play a crucial cross-linking role in bacterial cell walls. An effective inhibitor of DHDPS would represent a useful antibacterial agent; despite extensive effort, a su…
The structure, magnetic properties and coercivity mechanism of Nd 2 Fe 14 B/α-Fe multilayer films with Mo spacer layers are investigated. The influences of grain boundary roughness and the domain wall on the anisotropy field and stray field are considered in the analysis of the coercivity mechanism. It is found that r…