Behaviours of embedded carbon nanotubes during film cracking
Embedded carbon nanotubes delay polymer film cracking via tube stretching and pulling out. Tube breaking is not observed in our experiments, which contradicts a previous report.
Materials Literature
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Synthesis, Crystal Structure, Magnetic Susceptibility, and Mössbauer Spectroscopy of a Mixed-Valence Organic−Inorganic Hybrid Compound: (H3DETA)[Fe3(C2O4)2(HPO4)2(PO4)] (DETA = Diethylenetriamine)
A mixed-valence organic−inorganic hybrid compound, (H 3 DETA)[Fe 3 (C 2 O 4 ) 2 (HPO 4 ) 2 (PO 4 )] (DETA = diethylenetriamine), has been synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction, magnetic susceptibility, 57 Fe powder absorption Mössbauer spectroscopy, and electri…
Molecular rectangles from metallomacrocycles: development of dibenzofuran ligands
Two new ligands 4,6-bis(4′-pyridylsulfide)dibenzofuran L1 and 4,6-bis(methylsulfanylmethyl)dibenzofuran L2, based on dibenzofuran with exodentate thio-pyridine arms were prepared. The crystal structures of three metallomacrocycles were determined. Reaction of L1 with AgClO4 in a 1 : 1 metal-to-ligand ratio gave a ClO4…
Structure and Kinetic Properties of Paracoccus pantotrophus Cytochrome cd1 Nitrite Reductase with the d1 Heme Active Site Ligand Tyrosine 25 Replaced by Serine
The 1.4-A crystal structure of the oxidized state of a Y25S variant of cytochrome cd(1) nitrite reductase from Paracoccus pantotrophus is described. It shows that loss of Tyr(25), a ligand via its hydroxy group to the iron of the d(1) heme in the oxidized (as prepared) wild-type enzyme, does not result in a switch at…
Synthesis and sintering properties of aluminium nitride nanopowder prepared by the gas-reduction nitridation method
Aluminium nitride (AlN) nanopowder was successfully synthesized from transition alumina nanopowder via a new single-step nitridation process. A gas mixture of NH 3 –C 3 H 8 was employed as a reduction–nitridation agent, which enables direct nitridation of transition alumina at processing temperatures of 1200–1400 ° C.…
Synthesis of Germanium Nanoclusters with Irreversibly Attached Functional Groups: Acetals, Alcohols, Esters, and Polymers
Germanium nanoclusters of average diameter 4 nm were prepared with covalently bound termination groups. Chloride-terminated nanoclusters were reacted with a Grignard reagent to form acetal-containing surface-terminated nanoclusters. Treatment with acid yielded hydroxyl-containing surface-terminated nanoclusters, and t…
Characterization of Peptide−Amphiphiles Possessing Cellular Activation Sequences
Numerous approaches have been described for modifying biomaterials to incorporate extracellular matrix components. "Peptide-amphiphiles", whereby monoalkyl hydrocarbon chains are covalently linked to peptide sequences, have been shown previously to (a) form specific molecular architecture with enhanced stability and (…
Enhanced Aggregation Behavior of Antimony(V) Porphyrins in Polyfluorinated Surfactant/Clay Hybrid Microenvironment
Polyfluorinated surfactant (C n F 2 n +1 CONH(CH 2 ) 2 N + (CH 3 ) 2 C 16 H 33 Br -; designated as C n F-S, where n = 1−3)/clay hybrid compounds have been shown to provide polyfluorinated microcavities in the clay interlayers with molecular dimensions. The aggregation behavior of a water-soluble porphyrin (tetra(4-sul…
Synthesis, Crystal Structure, Crystal Chemistry, and Magnetic Properties of PbMBO4 (M = Cr, Mn, Fe): A New Structure Type Exhibiting One- Dimensional Magnetism
The crystal chemistry of a new structure type found in the Pb−M−B−O system, PbMBO 4 (M = Al, Ga), was extended to include M = Cr, Mn, and Fe. Extension to other trivalent ions, such as Ti, V, Co, Sc, In, and Y, failed for various reasons. Single crystals were grown from a PbO flux for M = Mn and Fe and the crystal str…
Hierarchically ordered networks comprising crystalline ZrO2 tubes through sol–gel mineralization of eggshell membranes
A facile sol–gel coating procedure has been successfully applied for the ZrO2 coating of eggshell membranes (ESM), resulting in hierarchically ordered thin films with a macroporous network structure comprising crystalline ZrO2 tubes. This hierarchical material, which was obtained through sol–gel mineralization of the…
A simple metalorganic route to organically passivated mercury telluride nanocrystals
Nanocrystalline HgE (E = S, Se, Te) particles are an important class of materials that may have applications in the opto-electronics industry, notably as potential replacements for rare-earth dopants in optical fibers or in opto-electronic modulators. Organometallic routes to nanoparticles can produce materials of a s…
Preparation of ZnO nanocrystals via ultrasonic irradiation
A simple and rapid process has been developed for the preparation of nanometer-sized ZnO crystals via ultrasonic irradiation, by which pure ZnO nanocrystals with an average size of 6 nm and narrow size distribution can be synthesized in a short time and without using any solvents for the precipitation of ZnO.
High-Temperature Lithium Mobility in α-LiZr2(PO4)3 NASICON by Neutron Diffraction
Powder neutron diffraction data at high resolution (HRPD instrument, ISIS Facility, U.K.) were collected on the lithium ion conductor α-LiZr 2 (PO 4 ) 3 at 673 K ( a = 8.84448(3) Å, c = 22.2875(1) Å), and 873 K ( a = 8.83667(4) Å, c = 22.4177(2) Å). Previous data measured at 423 K were included in the analysis. By Fou…
Unusual Interactions Binding Iron Tetrasulfonated Phthalocyanine and Poly(allylamine hydrochloride) in Layer-by-Layer Films
Molecular-level interactions are found to bind iron tetrasulfonated phthalocyanine (FeTsPc) and the polyelectrolyte poly(allylamine hydrochloride) (PAH) in electroactive layer-by-layer (LBL) films. These interactions have been identified by comparing Fourier transform infrared (FTIR) and Raman spectroscopy data from b…
Measuring the nematic order of suspensions of colloidal fd virus by x-ray diffraction and optical birefringence
The orientational distribution function of the nematic phase of suspensions of the semiflexible rodlike virus fd is measured by x-ray diffraction as a function of concentration and ionic strength. X-ray diffraction from a single-domain nematic phase of fd is influenced by interparticle correlations at low angle, while…
Adhesion between Immiscible Polymers Correlated with Interfacial Entanglements
Adhesion in immiscible, weakly bonded polymeric layered structures is explored. Of particular interest are common commercial polymers used in multilayered packaging materials. Based on the scission of entangled chains at the polymer−polymer interface, a correlation between the critical mechanical energy release rate f…
Staircase effect in metamagnetic transitions of charge and orbitally ordered manganites
This paper reports on peculiar metamagnetic transitions which take place in antiferromagnetic, charge and orbitally ordered (AFCOO) manganites. At very low temperatures, the virgin magnetization curves of some of these compounds exhibit several, sharp steps giving rise to a staircase-like shape. This staircase effect…
CuPc molecules adsorbed on Au(110)-(1x2): growth morphology and evolution of valence band states
We present the growth morphology, the long range ordering, and the evolution of the valence band electronic states of ultra-thin films of copper phthalocyanine (CuPc) deposited on the Au(110)-(1x2) reconstructed surface, as a function of the organic molecule coverage. The Low Energy Electron Diffraction (LEED) pattern…
Quantum transport properties of ultrathin silver nanowires
The quantum transport properties of ultrathin silver nanowires are investigated. For a perfect crystalline nanowire with four atoms per unit cell, three conduction channels are found, corresponding to three s bands crossing the Fermi level. One conductance channel is disrupted by a single-atom defect, either adding or…
Dynamic structure factor of liquid and amorphous Ge fromab initiosimulations
We calculate the dynamic structure factor $S(k,\ensuremath{\omega})$ of liquid Ge $(l$-Ge) at temperature $T=1250\mathrm{}\mathrm{K},$ and of amorphous Ge $(a$-Ge) at $T=300\mathrm{K},$ using ab initio molecular dynamics. The electronic energy is computed using density-functional theory, primarily in the generalized g…