Materials Literature
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The chemical and morphological surface properties of different unbleached and oxygen delignified softwood kraft pulp fibers were evaluated by using different ESCA and SEM techniques. The results of the different techniques have revealed that the surface of unbleached and oxygen delignified kraft pulp fibers has a high…
Spherical micelles of block copolymers may arrange into macrolattices in the bulk, in the blends with homopolymers, and in the solutions with low molecular weight solvents. In this study, we present the first experimental observation on the face-centered cubic (fcc) lattice of spherical micelles in diblock copolymer/h…
While high-throughput methods of protein production and crystallization are beginning to be well documented, owing to the output of large structural genomics programs, medium-throughput methods at the laboratory scale lag behind. In this paper, we report a possible way for an academic laboratory to adapt high-throughp…
The liquid crystal state or the mesophase of a substance occurs on the phase diagram between the crystal and the liquid phase. The liquid crystal state is also known as the mesomorphic state, and i...
Owing to the great versatility offered by polyurethanes regarding the ease of synthesis and variable properties of the final product obtained (elastomeric or rigid polymer), polyurethanes become a basic component used in IPN formation. Numerous studies were conducted on IPNs based on polyurethanes and various vinyl mo…
Self-assembly of the building block [Cu(oxbe)](-) with Mn(II) led to a novel coordination polymer ([Cu(oxbe)]Mn(H(2)O)[Cu(oxbe)(DMF)])n).nDMF.nH(2)O, where H(3)oxbe is a new dissymmetrical ligand N-benzoato-N'-(2-aminoethyl)oxamido and DMF = dimethylformamide. The crystal forms in the triclinic system, space group Pon…
Barium titanate fine particles were prepared by hydrothermal synthesis. The synthesis was preformed at a temperature between 75 and 180 °C and for 10 min to 96 h. The reactions were carried out in a strong alkaline solution. Ba(OH) 2 ·8H 2 O was used as the Ba-precursor material. Various Ti precursors were used to inv…
A series of azobenzene-cored polyphenylene dendrimers have been synthesized. The photoresponsive properties of these dendrimers have been investigated by optical spectroscopy and gel permeation chromatography (GPC). These polyphenylene dendrimers exhibit a photoresponsive behavior upon UV and visible irradiation, resu…
The amine-containing polysaccharide chitosan was selectively deposited onto patterned gold surfaces in response to an applied voltage. Standard microfabrication techniques were used to pattern gold onto silicon wafers, and these gold patterns served as templates for the electric field directed deposition of chitosan.…
Spherulites and spherulitic growth are characteristic of melt-crystallized polymers and exert a profound influence on their mechanical and other properties. They and their formation have, neverthel...
It is shown that both structural phase transitions in Cd2Re2O7, which occur at T_{s1}=200 K and T_{s2}=120 K, are due to an instability of the Re tetrahedral network with respect to the same doubly degenerate long-wavelength phonon mode. The primary structural order parameter transforms according to the irreducible re…
Two polymeric malonato-bridged manganese(II) complexes of formula [Mn(mal)(H(2)O)(2)](n)() (1) and [Mn(2)(mal)(2)(4,4'-bipy)(H(2)O)(2)](n)() (2) have been synthesized and characterized (mal = malonate dianion; 4,4'-bipy = 4,4'-bipyridine). The crystal structure of complex 1 was already known. Complex 2 crystallizes in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical and Spectroscopic Aspects of Polymer Ablation: Special Features and Novel DirectionsThomas Lippert and J. Thomas DickinsonView Author Information Paul Scherrer Institut, 5232 Villigen PSI, Switzerland, and Washington State University, Pullman, Washington 99164-2814…
A family of poly[( m -phenylenevinylene)- co -( p -phenylenevinylene)]s, functionalized in the synthetically accessible C-5 position of the meta-disubstituted phenylene rings have been designed and synthesized: they are essentially poly{(5-alkoxy- m -phenylenevinylene)- co -[(2,5-dioctyloxy- p -phenylene)vinylene]} (P…
Co-continuous structures can be regarded as the coexistence of at least two continuous structures within the same volume. Blends with co-continuous structures may combine the properties of both components in a favorable way, for example, mechanical moduli. This review article deals with the identification, characteriz…
High ortho novolactype phenolic resin and waste poly(ethylene terephthalate) (PET) were used to prepare blends and reaction products. The effect of PET on the thermal oxidative stability of these products was investigated with thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and fourier trans…
Nanocrystalline boron carbonitride thin films were prepared using the electron-cyclotron- wave-resonance plasma-assisted deposition, whereby the energy for precursor ions was adjusted between 70 and 180 eV. Fourier-transform infrared spectroscopy confirmed the presence of ternary sp3-bonded structure and high-resoluti…
The dynamic response of a titanium carbide (TiC)–carbon steel, ceramic-metal composite, was studied in planar impact experiments, using a copper impactor with velocity in the 80–450 m/s range. The composites were prepared by pressureless infiltration of TiC ceramic preforms by molten steel. The metallic component had…
The synthesis and characterization of a new constrained tetraazamacrocyclic ligand, 1,4,8,11-tetraazabicyclo[9.3.3]heptadecane (1,11-C(3)-cyclam), is reported. Because of its basicity, this ligand (pK(a) of the protonated form >13.5) requires aprotic solvents for its metalation reactions. Two complexes of this ligand,…
Crystal growth and optical properties of Cr4+ centers in Li2TiGeO5 single crystals were investigated. Polarized absorption spectra at low and room temperature indicate a lowering of symmetry of the local environment of the Cr4+ ion from Td to C2 group of symmetry. The crystal field parameter Dq and the Racah papramete…