Materials Literature
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An elusive goal for systemic drug delivery is to provide both spatial and temporal control of drug release. Liposomes have been evaluated as drug delivery vehicles for decades, but their clinical significance has been limited by slow release or poor availability of the encapsulated drug. Here we show that near-complet…
Here we report a new class of superconductors prepared by high-pressure synthesis in the quaternary family ReFeAsO 1−δ (Re=Sm, Nd, Pr, Ce, La) without fluorine doping. The onset superconducting critical temperature ( T c ) in these compounds increases with the reduction of the Re atom size, and the highest T c obtaine…
The recent advances in nanotechnology and the corresponding increase in the use of nanomaterials in products in every sector of society have resulted in uncertainties regarding environmental impacts. The objectives of this review are to introduce the key aspects pertaining to nanomaterials in the environment and to di…
Two Bacillus subtilis extracellular endo-1,5-alpha-L-arabinanases, AbnA and Abn2, belonging to glycoside hydrolase family 43 have been identified. The recently characterized Abn2 protein hydrolyzes arabinan and has low identity to other reported 1,5-alpha-L-arabinanases. Abn2 and its selenomethionine (SeMet) derivativ…
The equilibrium constant for the dimerization reaction, 2Br 2(g) right arrow over left arrow Br 4(g), is estimated using the classic spectrophotometric method with precise data and a multiwavelength fitting approach. The analysis is very sensitive to small errors in the data, requiring that parameters for the baseline…
The state of nanoclay dispersion in a molded epoxy disk and its effects on the thermomechanical properties of the resulting nanocomposite are analyzed. A commercially available nanoclay, Cloisite® 25A, is mechanically mixed at 2wt% with EPON 815C epoxy resin. The epoxy∕clay compound is then mixed with EPI-CURE 3282 cu…
The purpose of this study was to evaluate the effect of dental heat pressing on the microstructure of a glass–ceramic located in a SiO 2 –K 2 O–B 2 O 3 –MgO–F system. DTA, SEM and XRD techniques and mechanical testing methods were used. The results confirmed that the glass–ceramic could be successfully pressed with co…
Pengeringan gelatin dari bahan baku kulit ikan telah dilakukan menggunakan alat pengering tipe kabinet ( cabinet dryer ) dengan pemanasan bertahap dan aliran udara yang telah didehumidifikasi. Bahan yang akan dikeringkan adalah larutan gelatin kental yang didinginkan kemudian diekstrusi sehingga terbentuk mie gelatin…
Abstract Swelling‐agent‐free synthesis of mesocellular foam (MCF)‐like silica mesophases by a pH‐dependent structural transformation using carboxy‐terminated triblock copolymer Pluronic P123 has been discovered. The structural properties of the MCF‐like silica materials can be modulated by controlled calcination or po…
Three neutral nanoclusters Zn 8S(SC 6H 5) 14L 2 [L = 3-aminopyridine ( 1), 4-(dimethylamino)pyridine ( 2), 4-methylpyridine ( 3)] featuring a wurtzite-like core have been assembled by a controlled one-step hydrothermal reaction. Their detailed photoluminescence properties depend upon the ligand substituents. Cluster 1…
Abstract The one‐pot condensation/coordination reaction of 4‐iodobenzoylchloride, 2,3,4‐trimethylpyrrole and BF 3 × Et 2 O yields the BF 2 chelate complexes of the 1:1 condensation product 2‐(4‐iodobenzoyl)‐3,4,5‐trimethylpyrrole and of the 1:2 product 6‐(4‐iodophenyl)‐2,3,4,8,9,10‐hexamethyldipyrrin, as separable com…
Abstract The optical degradation of polydimethylsiloxane (PDMS) was investigated under exposure of 150 keV protons to reveal the damage behavior of organic silicone in space. The exposure was performed in a ground‐based simulation for space protons. The experimental results show that the optical degradation mainly occ…
Abstract New hydrogen‐bonding supramolecular polymers were obtained from 4,4′‐bipyridine and different silicon‐containing diacids. The formation and thermal stability of these complexes were verified with Fourier transform infrared spectroscopy following the specific absorption bands at 1950 and 2450 cm −1 . Their the…
In general, a caustic by refraction at an arbitrary surface is commonly known as a diacaustic. We study the formation of the diacaustic in a plane interface between an isotropic medium and a uniaxial crystal, for both ordinary and extraordinary rays, when the crystal axis is perpendicular to the plane of incidence and…
Using Monte Carlo simulations of the bond fluctuation model, we study the formation of micelles in a confined mixture of asymmetric AB-diblock copolymers and homopolymers. The composition of the sphere-forming AB-diblock copolymers is f A = 1 / 8 . The mixture is confined into a thin film. The film surfaces attract th…
This work reports on the synthesis of a spinel phase from a thermodynamically stable decagonal quasicrystalline Al 70 Co 15 Ni 15 alloy. The Al 70 Co 15 Ni 15 alloy, synthesized through slow cooling of the molten alloy, was subjected to milling in an attritor ball mill at 400 rpm for 5, 10, 20, 30, and 40 h with a bal…
It has turned out that the applied electric field is a powerful tool to clarify the transition mechanism of relaxor ferroelectrics. Kutnjak et al. have disclosed the existence of the critical end point in the temperature–field phase diagrams of a typical relaxor material Pb(Mg1=3Nb2=3)O3– PbTiO3, 1) and Iwata et al. h…
The photoluminescence (PL) and extended X-ray absorption fine structure (EXAFS) measurements have been carried out for the dehydrated fully Ag + exchanged zeolite A powders packed with controlled amounts of the adsorbed H 2 O molecules. The powders are designated as “air-packed 12Ag-A” and have been prepared by packin…
Molecular dynamics simulations of the ZnAl layered double hydroxide containing interlayer chloride anions have been performed in the NpT and Np(zz)T statistical ensembles for metal Zn/Al ratios of 2 and 3. We have monitored the interlayer spacing as a function of the number of intercalated water molecules for each sta…
Abstract A series of meso ‐substituted N ‐confused porphyrins (NCP) is synthesized using the modified Rothemund–Lindsey procedure. Lanthanide N ‐confused porphyrinate complexes of the general formula [(NCP)Ln(L OMe )] [Ln 3+ = Yb 3+ and Er 3+ ; L = (η 5 ‐C 5 H 5 )Co{P(=O)(OMe) 2 } 3 – ] are obtained in moderate yields…