Materials Literature
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In this paper we describe the facile synthesis of gold nanocrystals of variable morphology using aqueous foam as a template. The aqueous foams are formed by bubbling an aqueous solution of AuCl−4 ions electrostatically complexed with the surfactant cetyltrimethylammonium bromide (CTAB). The gold ions in the stable foa…
The stability of alumina-pillared montmorillonite clays, prepared at various Al/clay ratios, was investigated by compaction at various pressures. The physical properties of the pillared clays, before and after compaction, were studied by powder XRD and nitrogen sorption. We found that the Al/clay ratio used to prepare…
For poly(ethylene oxide) (PEO) melts containing lithium perchlorate (LiClO 4 ), angular frequency ω dependence of the dynamic dielectric properties under steady shear flow was measured using a rheodielectric instrument. The instrument also enabled measurements of the dielectric properties in the quiescent state as wel…
Comb polymers were produced in a two-step synthesis from a bacterial poly[3-hydroxyalkanoate- co -3-hydroxyalkenoate] (PHOU, 1 ) containing 25 mol % terminal side-chain double bonds. The radical addition reaction of 11-mercaptoundecanoic acid to the side-chain alkenes of 1 produced derivative 2 containing thioether bo…
Smectic montmorillonite clay was modified via cation exchange with ammonium salts of poly(oxypropylene)−polyamines (400, 3000, and 5000 M w ). Unusually wide silicate basal spacing (up to 80 Å) and high organic contents (up to 75 wt %) were observed when a 5000 M w amine was used as the intercalating agent. Moreover,…
High resolution transmission electron microscopy and field emission scanning electron microscopy are used to provide direct evidence for the solid-state transformations from cubic MCM-48 to lamellar mesophases. The structural change from MCM-41 to MCM-48 and MCM-50 with temperature is described in this report. Initial…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Edward J. Stancik, Anne L. Hawkinson, Jan Vermant, Gerald G. Fuller; Dynamic transitions and osci…
Heat-induced structural transformation in nanodiamond of diameter approximately 1.4 nm is investigated by tight-binding molecular dynamics simulations using the environment-dependent tight-binding carbon potential. The nanodiamond is found to transform into a tube-shaped fullerene via annealing. Three interesting mech…
We report a single step preparation of monodisperse fluorescent poly(methyl)methacrylate (PMMA) lattices cross-linked with ethylene glycol dimethacrylate with radii in the range 150-1000 nm using dispersion polymerization. The particles are applied as fluorescent cores in core-shell PMMA particles for confocal microsc…
To understand the role of electron-phonon interaction in superconducting ${\mathrm{MgCNi}}_{3}$ we have performed density-functional based linear response calculations of its lattice dynamical properties. A large coupling constant $\ensuremath{\lambda}=1.51$ is predicted and contributing phonons are identified as disp…
Exposure of heavily B-doped $(2\ifmmode\times\else\texttimes\fi{}{10}^{19}--4\ifmmode\times\else\texttimes\fi{}{10}^{20}{\mathrm{cm}}^{\ensuremath{-}3})$ diamond to a deuterium plasma results in the formation of passive B-D complexes which are bound with a dissociation barrier of 2.5 eV. In heavily doped material ther…
Two soft chemical processes enabling the low-temperature synthesis of γIII-CoOOH are reported. Both processes consist of an oxidation reaction of αII-Co(OH) 2 performed either in dry conditions (ozonation) or in solution. The γIII-CoOOH phase is usually prepared using a ceramic step process, which hinders its synthesi…
Hexagonal nanocrystalline Fe2P has been synthesized via a solvothermal route at a relatively low temperature of 180 °C. X-Ray diffraction (XRD), X-ray photoelectron spectra (XPS) and transmission electron microscopy (TEM) were used to investigate the phase, composition, and morphology of the final crystallized product…
A combination of transmission electron microscopy (TEM) and atomic force microscopy (AFM) revealed that a secondary ammonium hydrochloride of a peptidic lipid, in which an l -prolyl- l -prolyl- l -proline fragment is coupled with an l -glutamate derivative carrying two long alkyl chains, self-assembles in water to for…
Four kinds of 1:1 and 1:3 salts of 3-[4-(trimethylammonio)phenyl]-1,5-diphenyl-6-oxoverdazyl radical cation ([1](+)) and its mono- and dimethyl derivatives ([2](+) and [3](+)) with Ni(dmit)(2) anions (dmit = 1,3-dithiol-2-thione-4,5-dithiolate) ([1](+)[Ni(dmit)(2)](-) (4), [2](+)[Ni(dmit)(2)](-) (5), [3](+)[Ni(dmit)(2…
Enzymatic ring-opening polymerization of epsilon-caprolactone by various lipases was investigated in toluene at various temperatures. The determination of molecular weight and structural identification was carried out with gel permeation chromatography and proton NMR, respectively. Among the various lipases employed,…
The NMR and EPR spectra for three complexes, iron(III) octamethyltetraphenylporphyrin bis(4-cyanopyridine) perchlorate, [FeOMTPP(4-CNPy)(2)]ClO(4), and its octaethyl- and tetra-beta,beta'-tetramethylenetetraphenylporphyrin analogues, [FeOETPP(4-CNPy)(2)]ClO(4) and [FeTC(6)TPP(4-CNPy)(2)]ClO(4), are presented. The crys…
We have determined the first wide-range conductivity spectra of a mixed alkali glass system, extending from 10(-3) Hz to 1.3 THz. We report on a new mixed alkali effect in the ac conductivity that is evident even if the low-frequency contributions (linked to hopping motions of the mobile cations) are removed from the…
A novel sol−gel-assisted solid-state synthetic method has been developed to prepare pure and transition-metal-substituted cryptomelane 1D nanomaterials with controlled particle sizes. Different cross-linking reagents (PVA, glycerol, or glucose) have been used to prepare precursor powder materials and to produce nanoro…
The magnetic state of hexagonal close-packed iron has been the subject of debate for more than three decades. Although Mössbauer measurements find no evidence of the hyperfine splitting that can signal the presence of magnetic moments, density functional theory predicts an antiferromagnetic (afm) ground state. This di…