Materials Literature
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Transient absorption spectroscopy was used to investigate the dynamics of the photochromic indolinobenzospiropyran reaction in toluene solution and in phosphatidylcholine bilayers (1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC), 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC), and 1,2-dioleoyl-sn-glycero-3-phos…
This paper studies the antimony spreading and segregation that occurred along with the oxidation and solid-state reactions in the Fe2O3-Sb2O3 system. XRD, SEM, TG-DSC and particularly XPS were employed for characterizations. Sb2O4 and FeSbO4 are the only new phases detected. The formation of FeSbO4 is a more exothermi…
Computer simulations reveal how photoinduced chemical reactions in polymeric mixtures can be exploited to create long-range order in materials with features that range from the submicron to the nanoscale. The process is initiated by shining a spatially uniform light on a photosensitive AB binary blend, which thereby u…
The thermal stabilities of polysulfones with different lengths of the carbon-linker between sulfone groups have been explored. B3LYP and CBS-QB3 calculations on possible thermal decomposition mechanisms of model compounds show that even carbon-linked polysulfones copolymers of alkenes and SO 2 decompose by a radical c…
The interaction of the extended, fully-conjugated macrocycle, dipyridyldibenzotetraaza[14]annulene (1), with the square planar palladium(II) and platinum(II) complexes [M(dppp)(triflate)(2)].2H(2)O (M = Pd, Pt) has been investigated in both solution and the solid state. In each case solid products showing a 1:1 ratio…
Abstract The effect of the volume fraction of a dispersed phase on improvement in the toughness of injection‐molded isotactic polypropylene (i‐PP), blended with a styrenic thermoplastic elastomer, has been studied. The volume fraction of the dispersed phase, which indicates compatibility between elastomer and i‐PP, de…
The reaction between MnBr(2).4H(2)O with H(3)tmp (1,1,1-tris(hydroxymethyl)propane) in MeCN in the presence of Na(O(2)CCMe(3)) and NBu(4)Br produces the complex [Mn(8)(O(2)CCMe(3))(2)(tmp)(2)(Htmp)(4)Br(4)(H(2)O)(2)].2MeCN (1.2MeCN) in good yield. The centrosymmetric octanuclear molecule consists of four Mn(III) and f…
We have investigated shear-induced alignment of a bilayer of spherical diblock copolymer micelles within thin films using molecular dynamics simulations at two different levels of coarse-graining. At the microscopic level, the copolymers are modeled as bead and spring chains with specific interaction potentials which…
Combined electrochemical and UV-visible spectroelectrochemical methods were utilized to elucidate the prevailing mechanisms for electroreduction of previously synthesized porphyrin-corrole dyads of the form (PCY)H2Co and (PCY)MClCoCl where M = Fe(III) or Mn(III), PC = porphyrin-corrole, and Y is a bridging group, eith…
High frequency localized vibration modes for linear isotropic elastic plates and rods of slowly varying thickness are shown to occur within the vicinity of maximal or minimal cross-sections. Long wave asymptotic integration close to the eigenmodes of such cross-sections is provided. The cases of a one integer paramete…
Tapered copolymer brushes of methyl methacrylate (MMA) and 2-hydroxyethyl methacrylate (HEMA) were synthesized via surface-initiated atom transfer radical polymerization (ATRP) by gradual addition of HEMA to a reaction mixture that originally only had MMA as monomer. The copolymer brush grew linearly with polymerizati…
The pair interaction between crystal dislocations is systematically explored by analyzing particle trajectories of two-dimensional colloidal crystals measured by video microscopy. The resulting pair energies are compared to Monte Carlo data and to predictions derived from the standard Hamiltonian of the elastic theory…
Transporter ProP of Escherichia coli (ProPEc) senses extracellular osmolality and mediates osmoprotectant uptake when it is rising or high. A replica of the ProPEc C terminus (Asp468-Arg497) forms an intermolecular alpha-helical coiled-coil. This structure is implicated in the osmoregulation of intact ProPEc, in vivo.…
This work used a combination of designed synthesis conditions for SBA-15 to gain new insights into the genesis of micropores and secondary mesopores bridging the primary mesoporous channels. Different SBA-15 samples were prepared at low temperature (35 and 60 °C) without stirring to generate a simple monodispersed rod…
ABSTRACT A high carbon content in a ledeburite-martensite deposit provides high wear resistance. This can be accomplished in hardfacing by MAG welding with covered electrodes, alloying fluxes, and flux-cored wires. Hardfacing with covered electrodes is not efficient, whereas application of alloying fluxes is suitable…
Ion-beam irradiation of poly(methylphenylsilane) (PMPS) is shown to cause cross-linking reactions, leading to the formation of a polymer gel containing cylindrical nanostructures of regular length and thickness. The spatial distribution of cross-links of polymer molecules is found to be governed by the deposited energ…
Glu230, one of the acidic residues that cluster around the active site of the catalytic subunit of cAMP-dependent protein kinase, plays an important role in substrate recognition. Specifically, its side chain forms a direct salt-bridge interaction with the substrate's P-2 Arg. Previous studies showed that mutation of…
Preface. Symbols. 1 Principles of X-ray Diffraction. 1.1 The Basic Phenomenon. 1.2 The &theta /2&theta Scan. 1.3 Intensity of Bragg Ref lections. 1.4 Applications. 2 Identification of Chemical Phases. 2.1 Histogram-Based Techniques. 2.2 Linear Attenuation Coefficient &mu . 2.3 Determination and Interpretation of the &…
The preparation of smooth mesoporous silica layers on rough, porous stainless steel supports and the subsequent synthesis of well-intergrown b -oriented MFI films on these intermediate layers were investigated. Parameters such as surfactant−silica sol dilution, number of coating cycles, drying, and calcination were sy…
Radial ZnO nanowire arrays were self-assembled on the amorphous carbon thin layer on silicon substrates using thermal chemical vapor transport and condensation without any metal catalysts. We experimentally performed a systematic study to clarify the mechanism of the anomalous nucleation and growth and found that the…