Materials Literature
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Several 2-substituted benzoates (including 2-trifluoromethyl-, 2-chloro-, 2-bromo-, 2-iodo-, 2-nitro-, 2-methoxy-, and 2-acetyl-benzoates) were converted by phthalate-grown Arthrobacter keyseri (formerly Micrococcus sp.) 12B to the corresponding 2-substituted 3,4-dihydroxybenzoates (protocatechuates). Because these pr…
Critical phenomena of ferromagnetic transition at finite temperatures are studied in double-exchange systems. In order to investigate strong interplay between charge and spin degrees of freedom, Monte Carlo technique is applied to include fluctuations in a controlled and unbiased manner. By using finite-size scaling a…
Self-assembly of symmetric diblock copolymers in confined state has been investigated by means of Monte Carlo simulation method. The symmetric diblock copolymers were confined in two- (parallel walls or circle) or in three-dimensional (spherical or cylindrical) space. There are interactions between these boundaries an…
The 2D Fermi surface of 1st stage PdAl2Cl8 acceptor-type graphite intercalation compounds (GICs) has been investigated using the Shubnikov-de Haas (SdH) effect. One fundamental frequency is observed, the angular variation of which confirms its strongly 2D nature, as previously found through electrical conductivity mea…
We refined the crystal structure of AMnO3, with A = Y, Er, Yb and Lu by single crystal x-ray diffraction. Our results show some distinct differences with previous reports on LuMnO3 and YbMnO3. We show that the ferroelectric behaviour is originated in the dipole moment at the A-site, and not, as is the common opinion,…
Finite element calculations of dynamic fracture based on embedding cohesive surfaces in a continuum indicate that the predictions are sensitive to the cohesive law used. Simulations were performed on a square block in plane strain with an initial edge crack loaded at a constant rate of strain. Cohesive laws that have…
The motion of single- and two-cavitation bubbles generated by laser beams directly beneath a free surface is studied experimentally, using high-speed photography, and theoretically using the highly accurate boundary integral method. Favorable comparisons of bubble shape history and centroid motion are observed while t…
In this study, the phase transition behavior of the BaTiO3–BaZrO3 system was studied using micro-Raman scattering and dielectric measurement techniques. BaZrxTi1−xO3 ceramics were prepared for x=0.00, 0.05, 0.08, 0.15, 0.20, and 1.00 compositions using a solid-state reaction technique. A single-phase perovskite struct…
Masses, sizes, shapes of macromolecules from multifunctional monomers from theory to practice - historical perspectives, self-similarity, and preparative considerations dendrimers derived by divergent procedures using 1-2 branching motifs dendrimers derived by divergent procedures using 1-3 branching motifs convergent…
The particle size dependence of the reversible shear thickening transition in dense colloidal suspensions is explored. Five suspensions of monodisperse silica are synthesized via the Stöber synthesis. The physicochemical properties of the dispersions are quantified using transmission electron microscopy, dynamic light…
CuCr 1−x Mg x O 2 , a wide band gap semiconductor with the delafossite structure, has been synthesized in bulk and thin-film form. Bulk undoped CuCrO2 is almost black and has moderate conductivity with p-type carriers. Upon doping with 5% Mg, the conductivity increases by a factor of 1000. In films, the best p-type co…
Colloidal quantum rods of cadmium selenide (CdSe) exhibit linearly polarized emission. Empirical pseudopotential calculations predict that slightly elongated CdSe nanocrystals have polarized emission along the long axis, unlike spherical dots, which emit plane-polarized light. Single-molecule luminescence spectroscopy…
We consider colloidal particles in a binary solvent. The solvent mixture has a solubility gap. The system is studied, from a solvent point of view, in the one-phase region near the binodal. The colloidal stability is significantly influenced by a mechanism called capillary condensation. In the confined space between p…
Why does not gravity make drops slip down the inclined surfaces, e.g., plant leaves? The current explanation is based on the existence of surface inhomogeneities, which cause a sustaining force that pins the contact line. Following this theory, the drop remains in equilibrium until a critical value of the sustaining f…
The processes by which the silica-network structure is formed in reverse micelles were elucidated. The reverse micellar system was composed of didodecyldimethylammonium bromide (DDAB), cyclohexane, and HCl− aqueous solution, and the silica source was tetraethoxysilane (TEOS). The hydrolysis reactions for TEOS were com…
This paper, second in a series, reports the cationic polymerization of 3-ethyl-3-(hydroxymethyl)oxetane leading to branched polyethers containing exclusively methylol groups attached to the quaternary carbon atoms (primary hydroxyl groups). GPC chromatograms and MALDI TOF spectra of the isolated polymers demonstrated…
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionDesign and Therapeutic Application of Matrix Metalloproteinase Inhibitors. (Chem. Rev. 1999, 99, 2735−2776. Published on the Web September 8, 1999).Mark Whittaker, Christopher D. Floyd, Peter Brown, and Andrew J. H. GearingCite this: Chem. Rev. 2001, 101, 7, 2205–220…
A general route for the synthesis of homogeneous mixed-element oxides, based on the use of block polyalkylene oxide copolymers and single-source molecular precursors, is described. Thermolytic decomposition of the molecular precursors in the presence of an anhydrous solution of the block copolymer (in toluene) led to…
Rhodamine 6G-doped mesostructured silica is prepared by an acidic sol−gel route using poly- b -poly(propylene oxide)- b -poly(ethylene oxide) (EO x −PO y −EO x ) block copolymer surfactants. Using low-refractive-index ( n ∼ 1.2) mesoporous SiO 2 as a support, the synthesis is combined with soft lithography to produce…
SERS spectroscopy requires the illumination of delicate metal structures with intense laser light. In the present paper, the effect of laser illumination on these structures is investigated for silver island films and silver films over alumina particles in focused laser beams and at the tip of fiber-optic SERS sensors…