Materials Literature
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In an initial attempt to understand the structural organization of Bombyx mori silk fibroin stored in the silk gland using several solid-state NMR techniques, we recently reported the conformation of the crystalline form of silk I (The unprocessed conformation of the silk fibroin before spinning in the solid state) as…
We study the time evolution of damage in a fiber bundle model in which the range of interaction of fibers varies through an adjustable stress transfer function recently introduced. We find that the lifetime of the material exhibits a crossover from mean field to short range behavior as in the static case. Numerical ca…
We have developed a multistep route to the formation of covalently linked adducts of single-wall carbon nanotubes (SWNT) and deoxyribonucleic acid (DNA) oligonucleotides. X-ray photoelectron spectroscopy was used to characterize the initial chemical modification to form amine-terminated SWNTs, which were then covalent…
Poly( p -phenylene benzobisoxazole) (PBO) has been synthesized in the presence of single-wall carbon nanotubes (SWNTs) in poly(phosphoric acid) (PPA) using typical PBO polymerization conditions. PBO and PBO/SWNT lyotropic liquid crystalline solutions in PPA have been spun into fibers using dry-jet wet spinning. The te…
The progressive replacement of Rh with Ni modulates the electronic as well as chemical properties of body-centered [Rh14−xNix(CO)9(μ-CO)16]n− clusters (x=0, n=4; x=1, n=5 (shown here); x=2, n=4; x=5, n=2, 3) and prompts multivalence. The complexes obtained are isostructural, but not isoelectronic.
Extremely high carrier mobilities at room temperature are predicted in quasi-one-dimensional organic crystals at certain conditions that lead to the interference of two electron-phonon interaction mechanisms. The relaxation time as a function of carrier energy takes the form of a Lorentzian, which may be very sharp, i…
The synthesis, characterization, and molecular structures of the first air-stable, hexacoordinated high spin Fe(II) porphyrins (1) with axial alcohols are reported (1 = Fe(II) meso-tetrakis(o-dichlorophenyl)-beta-octanitroporphyrin). The structure of 1 with two axial waters is also presented. The very different confor…
We studied the evolution of defect lines (oily streaks) in cholesteric liquid crystals. In contrast to nematic liquid crystals, there were no interactions between the defect lines in cholesteric liquid crystals. We observed experimentally that individual open defect segments shrank with time with a linear relation, an…
Single crystals of Sr[C(2)(COO)(2)] were formed at the phase boundary of an aqueous silica gel that contained acetylenedicarboxylic acid and an aqueous solution of SrCl(2). The crystal structure (I4(1)/amd, Z=4) shows a diamond-like topology, with the strontium ions in an eightfold co-ordination by the oxygen atoms of…
Ordered silicas with high loadings of pendant methyl groups were synthesized via cocondensation of tetraethyl orthosilicate and triethoxymethylsilane under basic conditions in the presence of cetyltrimethylammonium surfactant. The resulting materials were characterized using X-ray diffraction (XRD), transmission elect…
Die lineare Korrelation zwischen Fluoreszenzanstieg und Photolysegrad bei der Blitzlichtphotolyse von Bis(carboxymethoxy)cumarinylmethyl-inaktiviertem („caged“) cAMP (1, R=H, R′=NH2) und cGMP (2, R=NH2, R′=OH) ermöglicht die Visualisierung und Quantifizierung des Freisetzungsprozesses der cyclischen Nucleotide innerha…
The reaction of the antiaromatic [28]trithiahexaphyrin (TTHP) with Cu(I) in DMF gives a novel fused-ring trithiahexaphyrin with the elimination of a chloride on a dichlorophenyl ring and bond formation to the outward oriented pyrrolic nitrogen to form a 5,5,6-tricyclic internal ring system. The NMR spectra, which disp…
Shape memory alloys (SMAs) exhibit two very important properties: shape memory phenomenon and superelastic deformation due to intrinsic thermoelastic martensitic transformation. To fully exploit the potential of SMAs in developing functional structures or smart structures in mechanical and biomechanical engineering, i…
A crystallographic mismatch branching mechanism, rather than molecular self-assembly, controls the architecture of the crystalline structure. Self-organized functional materials with a 3D fibrous network structure (see scanning electron micrographs; right) have been constructed from needlelike crystals of lanosterol:d…
Three new tetrathiafulvalene-substituted 2,2'-bipyridine ligands, cis-bpy-TTF(1), trans-bpy-TTF(1), and cis-bpy-TTF(2) have been prepared and characterized. X-ray analysis of trans-bpy-TTF(1) is also reported. Such ligands have been used to prepare two new trinuclear Ru(II) complexes, namely, [[(bpy)(2)Ru(micro-2,3-dp…
Reaction conditions determine the product: The reaction of GdCl3 and pre-formed K[Cu(CN)2] in DMF leads to a lanthanide–transition-metal complex with a layered structure. Treatment of GdCl3 with discrete quantities of CuCN and KCN, however, yields an inclusion complex with [Gd(dmf)8]3+ ions located within “pockets” (s…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTEnzymatic Hydrolysis of a Layer-by-Layer Assembly Prepared from Chitosan and Dextran SulfateTakeshi Serizawa, Miyuki Yamaguchi, and Mitsuru AkashiView Author Information Department of Nanostructured and Advanced Materials, Graduate…
Macromolecular crystallization is a complex process, involving a system that typically has five or more components (macromolecule, water, buffer + counterion, and precipitant). Whereas small molecules have only a few contacts in the crystal lattice, macromolecules generally have 10's or even 100's of contacts between…
A novel molecular based proton-electron mixed conductor, (H3BBIM(+))(TCNQ)(Cl(-))(0.5)(H(2)O) (1), where H3BBIM(+) is 2-(2-1H-benzimidazolyl)-1H-benzimidazolium and TCNQ is 7,7,8,8-tetracyano-p-quinodimethane, was synthesized. The salt exhibited peculiar phase transitions as a result of proton-electron coupling phenom…
Single ${\mathrm{Ar}}_{n}$ or $({\mathrm{CO}}_{2}{)}_{n}$ $(n\ensuremath{\simeq}960)$ cluster impacts on a diamond (111) surface are studied by large-scale molecular dynamics simulations in order to investigate highly energetic cluster-surface interactions. For a cluster impact energy ${E}_{a}$ of 100 keV, a hemispher…