Materials Literature
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Temperature dependence of crystal structures is examined with X-ray diffraction at normal pressure or elevated pressures for solution-grown nylons with octamethylene moiety between amino or carboxy groups (nylons 82, 410, 610, 810). Although octamethylene moiety between amino groups has the potential to cause the phas…
The phase transitions of a ferroelastic CsPbCl 3 single crystal grown by using the Bridgman method have been investigated using 133 Cs and 207 Pb nuclear magnetic resonance (NMR). Two sets of seven-line 133 Cs NMR signals were obtained instead of a simple seven-line structure. From the experimental data, the 133 Cs NM…
The electronic ground state of RbMnFe(CN) 6 is calculated by using all-electron full-potential linearized augmented-plane–wave (FLAPW) method in the local density approximation (LDA).With using the tetragonally distorted structure determined by the x-ray diffraction (XRD) measurement, we obtain the ferromagnetic groun…
Neutron diffraction measurements for liquid (l-) Te and l-As–Te mixtures (10, 20, 30 and 40 at.% As) have been performed. The first minimum after the first peak of g ( r ) for l-Te and l-As–Te mixtures is filled up with temperature, and the second peak diminishes substantially and flattens out at high temperature. The…
Specific morphologies occasionally appear in the crystal growth in gels. Potassium dichromate (K 2 Cr 2 O 7 ) crystals grown in gelatin gel have been found to exhibit various morphologies by varying only initial concentrations of K 2 Cr 2 O 7 and gelatin in the medium. Particularly unique are huge helical crystals gro…
Neutron diffraction studies have been carried out on a single crystal of oxygen-deficient perovskite NdBaCo2O5 in the temperature range of 7-370 K. There have been observed, with decreasing temperature T, two magnetic transitions accompanied with structural changes, to the antiferromagnetic phase at ~360 K and to the…
Abstract The intercalation of four kinds of hexose for Mg–Al layered double hydroxide (LDH) by the calcination–rehydration reaction using the Mg–Al oxide precursor has been investigated. In spite of non-ionized organic guest, hexose was intercalated for the LDH, and the intercalation behavior of hexose was greatly inf…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTPatterning of Conductive Polyaniline Films from a Polymerization-Induced Self-Assembled GelRethi Madathil, Raman Parkesh, Surendra Ponrathnam, and Maryanne C. J. LargeView Author Information SFI Nanoscience Laboratory, Trinity Colle…
Spent FCC catalyst was regenerated in a fluidized-bed reactor at 700 °C using a 2% O 2 in N 2 feed. The NO and CO emissions during regeneration were measured when Ag-based additives were used and compared with those when a commercial Pt-based CO promoter (1% CP-3) was added. All Ag/alumina additives exhibited high NO…
The preparation and swelling behavior of surface-attached charged statistical copolymer brushes are described. The brushes are prepared by free radical chain polymerization of monomer mixtures of 4-vinylpyridine (VP) and dimethylacrylamide (DMAA) using a surface bound azo-initiator (surface-initiated polymerization).…
Bioassay-directed fractionation of an anti-inflammatory CHCl(3)-MeOH (9:1) extract of leaves of Vernonia colorata, using a carrageenan-induced rat paw model, led to the isolation of six new compounds (1-6). These were assigned as two new androst-8-en glycosides, 3-O-[beta-d-galactopyranosyl-(1-2)-[beta-d-glucopyranosy…
We have investigated the adsorption structures and thermal desorption behavior of C 2 H 4 on Ge(100) using scanning tunneling microscopy (STM) and temperature programmed desorption (TPD) under ultrahigh vacuum (UHV). Ethylene molecules adsorb in two distinct bonding geometries: (i) on top of a single Ge−Ge dimer (on-t…
Two new volumetric sorption techniques have been developed to measure thermodynamic and mass-transport properties in polymer−solvent systems at elevated pressures. They are both variations of the pressure-decay technique and differ in how the initial gas density is measured. In the first and simplest variation, the in…
Using an atomic force microscope (AFM), we have investigated the interaction forces exerted by latex particles bearing densely grafted polymer brushes consisting of poly(N,N-dimethylacrylamide) (PDMA), poly(methoxyethylacrylamide) (PMEA), poly(N-isopropylacrylamide) (PNIPAM), and PMEA-b-PNIPAM in aqueous media (good s…
We apply the semiempirical nonlocal pseudopotential method to the investigation of prospects for direct carrier multiplication (DCM) in neutral and negatively charged CdSe nanocrystals. In this process, known in the bulk as impact ionization, a highly excited carrier transfers, upon relaxation to the band edge, its ex…
ADVERTISEMENT RETURN TO ISSUECommunicationNEXTA Novel Method for Preparation of Disorderly Exfoliated Epoxy/Clay NanocompositeJun Ma, Zhong-Zhen Yu, Qing-Xin Zhang, Xiao-Lin Xie, Yiu-Wing Mai, and Ian LuckView Author Information Centre for Advanced Materials Technology (CAMT), School of Aerospace, Mechanical and Mecha…
Here, we report the first example of transition metal-catalyzed one-pot synthesis of water-soluble dendritic molecular nanocarriers behaving like unimolecular micelles. Using the palladium-alpha-diimine chain walking catalyst, copolymerization of ethylene and comonomer 3 afforded, in one step, amphiphilic copolymer 1…
In our previous study, in vitro evolution of type II polyhydroxyalkanoate (PHA) synthase (PhaC1Ps) from Pseudomonas sp. 61-3 yielded eleven mutant enzymes capable of synthesizing homopolymer of (R)-3-hydroxybutyrate [P(3HB)] in recombinant Escherichia coli JM109. These recombinant strains were capable of accumulating…
A noble metal ion (Pt 2+ and Pd 2+ ) adsorbent with uniform mesopore channels was prepared by grafting a thiol functional group, (3-mercaptopropyl)trimethoxysilane (MPTMS), onto ordered mesoporous silica, SBA-15. Results show that the ordered mesostructure of SBA-15 was retained after modification and the thiol functi…
Nanocrystalline films of La-doped CaB$_6$ have been fabricated by using a rf-magnetron sputtering. Lattice expansion of up to 6% with respect to the bulk value was observed along the direction perpendicular to the film plane, which arises from the trapping of Ar gas into the film. Large ferromagnetic moment of 3 ~ 4 B…