Materials Literature
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We synthesized analogous series of monodisperse ABC triblock copolymers with symmetrical end blocks A/C and different short middle blocks B (5−10 wt %) with varying polarities by sequential anionic polymerization, i.e., polystyrene- b- poly(2-vinylpyridine)- b -poly(methyl methacrylate) (PS- b -P2VP- b -PMMA) and poly…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTAromatic Polyethers with Low Polydispersities from Chain-Growth PolycondensationTsutomu Yokozawa, Yukimitsu Suzuki, and Shuichi HiraokaView Author Information Department of Applied Chemistry, Kanagawa University Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan Cite…
The synthesis of poly(trifluoropropylmethyl)siloxane (PTFPMS) by anionic ring-opening polymerization of 1,3,5-tris(trifluoropropylmethyl)cyclotrisiloxane (F 3 ) was studied in miniemulsion using didodecyldimethylammonium bromide (DDDBr) as emulsifier and sodium hydroxide as initiator. This new process of polymerizatio…
Spontaneously forming H- and J-type chiral self-assemblies of lutein and lutein diacetate were studied by means of ultraviolet−visible and circular dichroism spectroscopy (CD). Spectroscopic properties of their thin films has been determined for the first time. Existence of chiral superstructures in both solution and…
Semiconductor SnO 2 nanowire arrays were fabricated by electrochemical deposition and thermal oxidizing methods based on highly ordered nanoporous alumina membrane. Their microstructures were characterized by X-ray diffraction, transmission electron microscopy, Raman spectrum, and scanning electron microscopy. The res…
Core−shell colloids comprising gold nanoparticles and a uniform titania coating were prepared by the complexation of polyelectrolyte preassembled on the core particles with titanium(IV) bis(ammonium lactato) dihydroxide (TALH) in aqueous solution, followed by hydrolysis of TALH.
We have examined the effect of an oscillatory rotation of a polarized dielectric particle. The rotational motion leads to a re-distribution of the polarization charge on the surface of the particle. We show that the time averaged steady-state dipole moment is along the field direction, but its magnitude is reduced by…
A large magnetic entropy change $|\ensuremath{\Delta}S|$ has been observed in Heusler alloy ${\mathrm{Ni}}_{52.6}{\mathrm{Mn}}_{23.1}{\mathrm{Ga}}_{24.3}$ single crystal near the martensitic structural transition temperature of 300 K with applied field along [001] direction. The obtained $|\ensuremath{\Delta}S|$ under…
The new oxychloride InTeO(3)Cl was synthesized from a mixture of In(2)O(3), InCl(3) and TeO(2). Its structure has been determined from single-crystal X-ray diffraction data. The structure is composed of layers separated by a van der Waals gap. The layers consist of edge-sharing chains of [InO(4)Cl(2)] octahedra linked…
Abstract A series of aliphatic poly(carbonate‐ co ‐phosphate)s was synthesized in bulk using aluminium isopropoxide as initiator by ring‐opening polymerization with various cyclic carbonates (trimethylene carbonate (TMC) and 5,5‐dimethyltrimethylene carbonate (DTC)) and cyclic phosphates (ethylene ethyl phosphate (EEP…
Three newly elucidated crystal structures of group IV phthalocyaninato complexes are reported, along with data for two further SiPc carboxylate complexes. In one of these crystal structures, bis(undecylcarboxylate)Sn(IV) phthalocyanine, the tin ion is seven coordinate, which is a unique finding for this atom in phthal…
The selected-area electron diffraction technique has been used to investigate the structure of bundles of single-wall carbon nanotubes synthesized by the catalytic chemical vapor deposition method. The helicity and lattice packing of the single-wall carbon nanotubes within the bundles have been deduced from the experi…
Nanotubular materials inspired by crystalline diborides such as ${\mathrm{AlB}}_{2}$ are proposed. The atomic structure, in particular the basic chemical question of where to put Al atoms in order to stabilize nanotubular Al-B systems, is investigated using density-functional calculations for prototype systems. The op…
Recent processing technologies have employed the in situ polymerization of organic monomers to consolidate particulate suspensions of ceramics into dense and strong bodies. The same principle has been applied to solidify foamed ceramic suspensions with great success. In this work, the parameters that influence the pol…
Transition metal complexes of 2-[4'-(2,2':6',2' '-terpyridyl)]-(4,4,5,5-tetramethylimidazolinyl-3-oxide-1-oxyl) (terpy-NIT) and 2-[4'-(2,2':6',2' '-terpyridyl)]-(4,4,5,5-tetramethylimidazolinyl-1-oxyl) (terpy-IM) have been prepared. Whereas the pyridyl fragments of the free ligands are in an anti conformation, the com…
Abstract To increase their adhesion to silver, polyimide (PI) surfaces were modified by sulfonation reactions by means of different experimental procedures. The results of these modification reactions were analyzed in terms of the variation of the surface chemical composition examined by X‐ray photoelectron spectrosco…
The reaction of (NBu(4))(2)[Pt(C triple bond CPh)(4)] with Cd(ClO(4))(2).6H(2)O in a 1:1 molar ratio yields a white solid [PtCd(C triple bond CPh)(4)](n) 1 (75% yield) together with yellow crystals of a very unusual decanuclear platinum-cadmium cluster [Pt(4)Cd(6)(C triple bond CPh)(4)(mu-C triple bond CPh)(12)(mu(3)-…
Abstract Free‐standing films of polyaniline (PANI), in an emeraldine base state, prepared by evaporation of polymer solutions in N ‐methylpyrrolidone (NMP) retain solvent even under dynamic vacuum drying as indicated by transmission Fourier transform infrared (FTIR) spectroscopy, where a band at 1670 cm −1 is clearly…
The interaction of a water molecule with a neutral oxygen vacancy on the MgO(100) surface is studied in the limit of very low coverage by total-energy calculations and molecular-dynamics simulations based on the density-functional theory. Exchange and correlation effects are treated within the generalized gradient app…
Carbon nitride $({\mathrm{CN}}_{x})$ films were deposited by reactive sputtering to study the effect of the ion bombardment during deposition (IBD) on their bonding structure. Fourier-transform infrared (IR) ellipsometry (FTIRE) was used to identify and distinguish the characteristic bands of the ${\mathrm{sp}}^{3}$ $…