Materials Literature
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An atmospheric-pressure oxygen and helium plasma was used to treat the surfaces of polyetheretherketone, polyphenylsulfone, polyethersulfone, and polysulfone. Water-contact-angle measurements, mechanical pull tests, X-ray photoelectron spectroscopy (XPS), and atomic force microscopy were used to analyze the change in…
Calcium titanate crystallization has been observed following the hydrothermal reaction of titanium dioxide (TiO 2 ) and calcium in alkaline solution at 250 °C, using time-resolved in situ energy-dispersive diffraction. The nature of the calcium source used was found to influence the type of calcium titanate formed; Ca…
We examined the photoluminescent behaviors of MgSiN2:Mn2+ and MgSiN2:Ce3+,Mn2+ phosphors for use in white-light-emitting diodes. The red emission from MgSiN2:Mn2+ phosphors consisted of two Gaussian components, P1 from a single Mn2+ ion and P2 from either Mn2+ pairs or clusters. Decay analysis based on the Yokota and…
Templated surfaces can be used to create patterns of proteins for applications in cell biology, biosensors, and tissue engineering. A diblock copolymer template, which contains a pair of hydrophobic blocks, has been developed. The template is created from well-ordered, nonequilibrium surface structures of poly(styrene…
The overexposure process of poly(methyl methacrylate) (PMMA) was studied in detail using electron-beam lithography. It was found that PMMA films could be directly patterned without development due to the electron-beam-induced collapse of PMMA macromolecular chains. By analyzing the evolution of surface morphologies an…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTA Trinuclear Pd−Diimine Catalyst for "Core-First" Synthesis of Three-Arm Star Polyethylenes via Ethylene "Living" PolymerizationKejian Zhang, Zhibin Ye*, and Ramesh SubramanianView Author Information School of Engineering, Laurentia…
The determination of the three-dimensional structure of a weak protein-protein complex in solution using small-angle X-ray scattering requires the deconvolution of its contribution from those of other components coexisting in equilibrium. Using the oligomerization equilibrium of low molecular weight phosphatase (lmwPT…
The interfacial properties of commercial poly(ether ether ketone) (PEEK) have been tailored by tethering polymeric brushes to the PEEK surface via surface-initiated atom transfer radical polymerization (SI-ATRP). The immobilization of an ATRP initiator on the PEEK surface was achieved by an unprecedented simple two-st…
The use of the mononuclear species (NBu(4))(2)[Re(IV)Cl(4)(ox)] (NBu(4)(+) = tetra-n-butylammonium cation; ox = oxalate dianion) as a ligand toward fully solvated divalent first-row transition-metal ions affords the tetranuclear complexes (NBu(4))(4)[{Re(IV)Cl(4)(mu-ox)}(3)M(II)] with M = Mn (1), Fe (2), Co (3), Ni (4…
We have synthesized a new superconductor ZnNyNi3 with Tc ~3 K. The crystal structure has the same anti-perovskite-type such as MgCNi3 and CdCNi3. As far as we know, this is the third superconducting material in Ni-based anti-perovskite series. For this material, superconducting parameters, lower-critical field Hc1(0),…
The synthesis, structure determination, and intrinsic luminescent properties of a new tantalate, EuKNaTaO(5), are reported. Single crystals of the title compound were grown out of a reactive KOH/NaOH eutectic melt. Luminescence in many materials is activated by doping a rare earth cation into the solid matrix; we repo…
The synthesis of exceptionally long semiconducting silver tetracyanoquinodimethane (AgTCNQ) nanowires has been achieved in the room temperature ionic liquid, 1-n-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF(4)) by photochemical reduction of TCNQ to TCNQ(-), coupled with use of benzyl alcohol as the sacrificial…
Ba 2 AlSi 5 N 9 was synthesized starting from Si 3 N 4, AlN, and Ba in a radio-frequency furnace at temperatures of about 1725 °C. The new nitridoalumosilicate crystallizes in the triclinic space group P 1 (no. 1), a = 9.860(1) Å, b = 10.320(1) Å, c = 10.346(1) Å, α = 90.37(2)°, β = 118.43(2)°; γ = 103.69(2)°, Z = 4,…
Calcium carbonate is an abundant biomineral with fascinating shapes and properties. Much effort is spent to study how creatures can control mineral formation. We present a quantitative study of the early stage of calcium carbonate precipitation in the presence of artificial peptide additives, the sequences of which we…
The framework materials [W(72)Mn(II/III)(12)O(268)X(7)](52-/40-) undergo heteroatom (X)-controlled reversible SC-SC redox reactions whereby the Ge-templated framework reduction is fast and reoxidation is slow. The opposite trend is set for the Si-templated framework, and these processes can be followed optically, spec…
The wetting behavior of hydrophobic, microstructured surfaces containing arrays of pillars or holes has been investigated. The size of the surface features was fixed (20 microm), while their separation was varied to adjust the area fraction (0-80%). The wettability of structured surfaces for liquids resting in the Cas…
The self-assembly of the trifluoroacetate salt of the short peptide (ala)6-lys (A6K) in water has been investigated by cryo-transmission electron microscopy and small-angle X-ray scattering. For concentrations below ca. 12%, the peptide does not self-assemble but forms a molecularly dispersed solution. Above this crit…
The process of coherent creation of particle-hole excitations by an electric field in graphene is quantitatively described. We calculate the evolution of the current density, number of pairs, and energy after switching on the electric field. In particular, it leads to a dynamical visualization of universal finite resi…
To explore the thermal response of the densely packed inner regime of poly( N -isopropylacrylamide) (PNIPAM) brushes grafted to gold nanoparticles (AuNPs), we systematically studied the thermoresponsive properties of NIPAM oligomeric brushes affected both by oligomer molar mass and Au core size. A series of NIPAM olig…
Reaction of copper(II) perchlorate with di-2,6-(2-pyridylcarbonyl)pyridine (pyCOpyCOpy, dpcp) in the presence of sodium azide yields complex [Cu(4)(N(3))(2){pyC(OMe)(O)pyC(OMe)(O)py}(2)(MeOH)(2)](ClO(4)) x 2 MeOH (1 x 2 MeOH), which crystallizes in the monoclinic P2(1)/c space group. Similar reaction of cobalt(II) nit…