Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTNew Hybrid Organic−Inorganic Solids with Helical Morphology via H-Bond Mediated Sol−Gel Hydrolysis of Silyl Derivatives of Chiral (R,R)- or (S,S)-DiureidocyclohexaneJoël J. E. Moreau, Luc Vellutini, Michel Wong Chi Man, and Catherine BiedView Author Information Laborat…
The synthesis and structural analysis of two constitutional isomeric libraries of self-assembling AB 2 monodendrons based on 3,4- and 3,5-disubstituted benzyl ether internal repeat units containing four different first generation monodendrons, i.e., 3,4,5-tris( n -dodecan-1-yloxy)benzyl ether, 3,4-bis( n -dodecan-1-yl…
This paper describes the design and preparation of thin polymeric films that resist the adsorption of proteins and the adhesion of bacteria to an extent comparable to, or better than, self-assembled monolayers (SAMs) that present tri(ethylene glycol) groups. These polymeric films were prepared by the reaction of a pol…
The movement of liquid drops on a surface with a radial surface tension gradient is described here. When saturated steam passes over a colder hydrophobic substrate, numerous water droplets nucleate and grow by coalescence with the surrounding drops. The merging droplets exhibit two-dimensional random motion somewhat l…
The problem of both phonon and electron scattering by long-range strain fields caused by wedge disclination dipoles (WDD) is studied in the framework of the deformation potential approach. The exact analytical results for the mean free path are obtained within the Born approximation. The WDD-induced contribution to th…
Copolymers composed of various amounts of 4‘-(11-acryloyloxyundecyloxy)biphenyl-4-carboxylic acid (11ABA) and acrylic acid (AA), poly(11ABA- co -AA)s, were synthesized, and their liquid crystalline structures were investigated both in dry and in water-swollen states. Wide- and small-angle X-ray studies revealed that b…
Local mirror-symmetry-breaking deformations such as flattening strongly affect electron coherent transport in single-wall armchair carbon nanotubes. Such a local deformation gives rich structures in electron transmission, such as a transmission barrier, resonances, and antiresonances. When local deformations create ba…
The low-frequency plasmon-resonant Raman scattering by the vibrational modes of silver nanoclusters embedded in amorphous ${\mathrm{SiO}}_{2}$ films is studied experimentally and theoretically. By electron microscopy it is observed that the concentration of defects in nanocrystals decreases and the intensity of Raman…
This paper discusses the elastic stability of unbraced frames under non-proportional loading based on the concept of storey-based buckling. Unlike the case of proportional loading, in which the load pattern is predefined, load patterns for non-proportional loading are unknown, and there may be various load patterns th…
The authors would like to amend the last line of page 7803 to read: `Our studies agree with that of Oliver et al [11] in one aspect that ZnFe 2 O 4 is ferrimagnetically ordered in nanocystalline form irrespective of the method of preparation of the samples'.
Ab initio Hartree−Fock method was used to examine the atomic-scale friction that occurs when two diamond (111) hydrogen-terminated surfaces are placed in sliding contact. The orientations of the hydrogen atoms at the surfaces and the formation of wear particles were investigated by geometry optimization, but the main…
We present the results of the electronic structure investigation for the compounds ${R}_{2}{\mathrm{Ti}}_{2}{\mathrm{O}}_{7}$ $(R=\mathrm{Sm}$--Er, Yb, Lu) with the pyrochlore-type crystal structure. The methods of x-ray photoelectron and emission spectroscopies, as well as the first-principles band-structure calculat…
Using ab initio multireference methods and large correlation consistent basis sets, we have investigated the ground electronic structure of the carbides BC and AlC, the ground and the first two excited states of the corresponding anions, BC - and AlC -, and the ground (linear) structures of the hydrides H−BC and H−AlC…
We present high-resolution neutron and synchrotron powder diffraction, magnetotransport, and magnetization measurements on Bi 0.5 Sr 0.5 MnO 3 . We report that, for the whole range of temperature 1.5 K⩽T⩽300 K, the sample studied exhibits coexistence of two phases. The majority phase presents charge and orbital order…
Measurements of the thermal conductivity for free-standing porous silicon layers were performed by means of an optical pump-probe experimental set-up. By transient heating due to laser pumping, a refractive index modulation was induced in the sample and, solving the heat propagation equation for inside the solid film,…
In ceramic La 1- x Ca x MnO 3 samples with 0⩽ x ⩽0.15 and the concentration of holes c = 0.18-0.22 between T = 77 and 340 K the resistivity, ρ, is shown to have an activated character both above and below the ferromagnetic Curie temperature, T C . The temperature dependence of the local activation energy, E loc ( T )…
Under selective excitation of the 3 P 0 level of the Pr 3+ ion in YPO 4 , the emission spectra and fluorescence decay curves were measured at different concentrations and temperatures. The origin of the spectral line located at 16 318 cm -1 (612.8 nm) was discussed and attributed to the 1 D 2 → 3 H 4 transition. The p…
A shell−core cluster 2 produced by depositing a self-assembled monolayer (SAM) of 6-thiohexyl-3-nitro-4-(4‘-stilbenoxymethyl)-benzoate ( 1 ) on a nanoparticulate gold colloid preserves normal solution-phase photoreactivity of the trans -stilbene and o -nitrobenzyl ether moieties, but shows quenched fluorescence. Neare…
Control over the orientation of a symmetric block copolymer lamellar morphology using a striped, chemically heterogeneous surface has been established. Films of symmetric diblock copolymers of poly(styrene- block -methyl methacrylate) solution cast onto silicon oxide substrates striped with periodic, 20 nm wide gold l…
Oppositely charged polyelectrolyte assemblies of poly(acrylic acid) and poly- l -lysine are deposited as alternate layers on cystamine-functionalized Au surfaces. Microgravimetric, quartz-crystal-microbalance, measurements and ellipsometric studies reveal a nonlinear increase in the polymer assembly thickness upon the…