Materials Literature
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Large Hall resistance jumps are observed in microdevices patterned from epitaxial (Ga,Mn)As layers when subjected to a swept, in-plane magnetic field. This giant planar Hall effect is 4 orders of magnitude greater than previously observed in metallic ferromagnets. This enables extremely sensitive measurements of the a…
Design and fabrication of thin film GaAs Grating-Assisted Resonant-Cavity LEDs (GA-RCLED) emitting at 980 nm are reported. The devices are fabricated by gluing the sample and a transfer substrate with benzocyclobutene (BCB) and consequently thinning the sample. The design is optimised for a high extraction efficiency.…
The relation between the uptake of atmospheric CO(2) and insect's production of silk fiber has not yet been reported. Here, we provide the first quantitative demonstrations that four species of silkworms (Bombyx mori, Samia cynthia ricini, Antheraea pernyi, and Antheraea yamamai) and a silk-producing spider (Nephila c…
A new series of molybdenum organophosphonates with a Mo∶P ratio of 1∶1 have been isolated. The proposed formulation for these compounds is (MoV2MoVI4O12)(O3XR)4[O2(OH)XR]2(EtOH)x [when X = P, R = C6H5, C6H5CH2, CH3 or C2H5; when X = As, R = C6H5; x = 5 (for R = C6H5 or CH2C6H5) or 4 (for R = CH3 or C2H5)]. These compo…
Fluorocopolymers of vinyl acetate (VAc) and one of tetrafluoroethylene (TFE), chlorotrifluoroethylene (CTFE), or vinylidene fluoride (VDF), or fluorocopolymer blends with PVAc, were cast from solution on Teflon-coated glass slides and analyzed for surface composition at both the air−polymer and Teflon−polymer surfaces…
Metathetic solid-state reactions of alkaline earth perovskite zirconates (AZrO 3, A = Ca, Sr, Ba) and lead sulfate (PbSO 4 ) result in the relatively quick formation of perovskite PbZrO 3 and the corresponding alkaline earth sulfate ASO 4 at temperatures as low as 1023 K. The product can be described as a composite di…
Neutron reflectivity has been used to determine the thickness and surface coverage of monolayers of two 14-residue beta-hairpin peptides adsorbed at the air/water interface. The peptides differed only in that one was labeled with a fluorophore, while the other was not. The neutron reflection measurements were mainly m…
There is a growing interest in the use of fuel cells as a power source for all-electric aircraft propulsion as a means to substantially reduce or eliminate environmentally harmful emissions. Among the technologies under consideration for these concepts are advanced proton exchange membrane and solid oxide fuel cells,…
Making a meal of it: Reflux-digestion of ZrO(OH)2 in basic solution results in an incorporation into the solid of Si4+ ions from the glass vessel, which induces texture and crystal stabilization of the zirconia product (see graph; S=surface area).
The growth rate of a crystal in the presence of impurity depends on the history of supercooling. This behavior is called growth rate hysteresis (GRH). In this paper, GRH is described by using a mathematical model. This mathematical model is devised by considering the pinning mechanism of Cabrera and Vermilyea, the two…
Bismaleimides and bisitaconimides bearing diphenylmethylamine, triphenylamine, or 2,5-diphenyl-1,3,4-oxadiazole chromophore (symbolized as A (=)−D (*) −A (=) ), as well as their saturated model compounds were synthesized, and their steady-state and time-resolved fluorescence spectra were investigated. These A (=) −D (…
The isothermal crystallization of the ether-soluble fraction (ES) of elastomeric stereoblock polypropylene (ePP) was investigated in situ by hot stage atomic force microscopy (AFM) at temperatures between 30 and 60 °C. Owing to the low average tacticity of 21% ([ mmmm ]), this material possesses a very low degree of c…
Topography and composition images of model thin films of deuterated polystyrene (dPS) and polyisoprene with different blend compositions were analyzed with an extension of integral-geometry approach. Surface patterns, formed in the course of spin-casting from toluene onto self-assembled monolayers (SAM), were recorded…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTADDITION / CORRECTIONThis article has been corrected. View the notice.Role of Molecular Architecture in Mechanical Failure of Glassy/Semicrystalline Block Copolymers: CEC vs CECEC LamellaeT. J. Hermel, S. F. Hahn, K. A. Chaffin, W.…
Checking the dosage! Carrying a drug adsorbed on a mesoporous silica material may become a standard to deliver drugs. But how can you be sure that the drug is safely tucked inside the channels (see graphic)? The authors tackle this tricky problem.
In recent years, pre-strained TiNi shape memory alloys (SMA) have been used for fabricating smart structure with carbon fibers reinforced plastics (CFRP). However, since the curing temperature of CFRP is higher than the reverse transformation temperatures of TiNi SMA, special fixture jigs have to be used for keeping t…
The ycdX gene of Escherichia coli encodes a protein of 27 kDa molecular weight that belongs to the PHP superfamily of proteins with diverse functions.1 This superfamily includes several types of DNA polymerases (namely, the α-subunit of bacterial DNA polymerase III, eukaryotic DNA polymerase β, and the X-family of DNA…
Hop, skip, and jump? Diffusion impedance in disordered systems was used to consider some physical aspects of carrier diffusion in electroactive films. Energy dispersion of ion sites or a distribution of electron sites (traps) is a common feature of these systems. The implications for transport are analyzed with a view…
Rate constants of photosensitized generation of O 2 ( 1 Σ g + ), O 2 ( 1 Δ g ), and O 2 ( 3 Σ g - ) have been determined for a series of ππ* triplet sensitizers with strongly varying oxidation potential ( E ox ), triplet energy ( E T ), and molecular structure, in CCl 4 . We demonstrate that one common dependence on E…
Eu(II) complexes are potential candidates for pO(2)-responsive contrast agents in magnetic resonance imaging. In this regard, we have characterized two novel macrocyclic Eu(II) chelates, [Eu(II)(DOTA)(H(2)O)](2-) and [Eu(II)(TETA)](2-) (H(4)DOTA=1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid, H(4)TETA=1,4,8,…