Materials Literature
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Syndiotactic polystyrene (sPS) nanorods with different diameters have been prepared by using anodic aluminum oxide templates, and the orientation of the sPS crystals in the nanorods has been investigated by FT-IR spectroscopy. It is found that the c axis of the β' crystals preferentially oriented perpendicular to the…
In this paper we introduce the two compounds $\ensuremath{\alpha}{\text{-C}}_{3}{\text{N}}_{2}$ and $\ensuremath{\beta}{\text{-C}}_{3}{\text{N}}_{2}$ with cubic symmetry, which are derived from a simple cubic carbon $({\text{C}}_{20})$ reported recently. Our first-principles calculations show that both the solids are…
Shape memory polymer stent prototypes were fabricated from thermoplastic polyurethane. Commercial stents are generally made of stainless steel or other alloys. These alloys are too stiff and prevent most stent designs from being able to navigate small and tortuous vessels to reach intracranial lesions. A solid tubular…
Antimicrobial nanofibers were prepared by solubilizing an antimicrobial essential oil (eugenol; 0.75-1.5 wt %) in surfactant micelles (Surfynol 465; 5-10 wt %) to form eugenol-containing microemulsions. Microemulsions were mixed with a nonionic synthetic polymer (poly(vinyl alcohol), PVA; M(w) = 130 kDa, degree of hyd…
To investigate the relationship between network connectivity and the types of anions and cations, we synthesized a series of supramolecular assemblies based on different polyoxometalate (POM) anions and halogen-substituted bipyridine cations, namely, (Hcpy) 6 H 2 [PMo 12 O 40 ] ( 1 ), (Hcpy) 3 [PMo 12 O 40 ]·2.2H 2 O…
Abstract Polyaniline (Pani) and Polyaniline‐silver nanocomposites (Pani‐Ag) were prepared by employing interfacial polymerization using ammonium persulphate as an oxidizing agent. During the polymerization, the Ag+ is reduced to Ag 0 , and the formations of regular nanocomposite materials were studied by Fourier trans…
The conformation of polymers at interface profoundly influences the interfacial properties. Quartz crystal microbalance with dissipation (QCM-D) is a newly developed technique to detect polymer behavior at interface in real time. In this article, we mainly review our QCM-D studies. Our focus is on temperature induced…
We study the time evolution of different Laponite suspensions from a low-viscosity ergodic state to a viscoelastic nonergodic state over a wide range of volume fractions and salt contents. We find that the evolution of nonergodicity parameter (Debye-Waller factor) splits into two branches for all the samples, which co…
Sericin is a highly hydrophilic protein family acting as the glue in Bombyx mori silk. In order to apply sericin as a wound dressing, a novel sericin film named gel film was prepared by a simple process without using any chemical modifications: sericin solution was gelled with ethanol into a sheet shape and then dried…
Positively charged poly(allylamine hydrochloride) (PAH) and poly(acrylic acid) (PAA) complexes (noted as PAH-PAA) with a molar excess of PAH were layer-by-layer (LbL) assembled with polyanion poly(sodium 4-styrenesulfonate) (PSS) to produce multilayer films. The film structure and deposition behavior of the PAH-PAA/PS…
Template synthesis is one of the most effective methods for the preparation of one-dimensional polymer-based nanostructures (1DPNs). Both hollow nanotubes and solid nanorods or nanofibers with tailored dimensions can be obtained by simply templating a porous material with suitable pore size. The mechanism of polymer i…
The electronic structure in the normal state of CeFeAsO0.89F0.11 oxypnictide superconductors has been investigated with x-ray absorption and photoemission spectroscopy. All of the data exhibit signatures of Fe d-electron itinerancy. Exchange multiplets appearing in the Fe 3s core level indicate the presence of itinera…
We propose a multipole representation of the Fermi-Dirac function and the Fermi operator, and use this representation to develop algorithms for electronic structure analysis of metallic systems. The new algorithm is quite simple and efficient. Its computational cost scales logarithmically with $βΔ\eps$ where $β$ is th…
The four-coordinate heteroleptic complex [Fe(III)((F)pda(2-))((F)dad*-)] (1) and its homoleptic analogue [Fe(II)((F)dad*-)2] (2), where (F)pda(2-) is the closed-shell ligand N,N'-bis(pentafluorophenyl)-o-phenylenediamide(2-) and (F)dad*- is the singly reduced N,N'-bis(pentafluorophenyl)-2,3-dimethyl-1,4-diazabutadiene…
Porous nylon-6 fibers are obtained from Lewis acid−base complexation of gallium trichloride (GaCl 3 ) and nylon-6 using electrospinning followed by GaCl 3 removal. DSC and FTIR results reveal that the electrospun fibers, prior to GaCl 3 removal, are amorphous with no hydrogen bonds present between nylon-6 chains. GaCl…
Abstract This paper reports a systematic study of the composition and the temperature‐dependent‐Raman spectra of Zr 4+ ‐rich BaZr x Ti 1− x O 3 (BZT) ceramic compositions (0.50⩽ x ⩽1.00). On the basis of the dielectric behavior of Zr rich BZT ceramics, the observed relaxor behavior has been hypothesized as a result of…
The growth of a thin gold film on a conducting polymer surface from nucleation to formation of a continuous layer with a thickness of several nanometers is investigated in situ with grazing incidence small-angle X-ray scattering (GISAXS). Time resolution is achieved by performing the experiment in cycles of gold depos…
In frameworks of scaling theory of phase transitions and critical phenomena the structure of melt-crystallized polymers is discussed. The model constructed follows drawing polymeric materials and dissipating the energy during the transition from isotropic to oriented state. It is possible to estimate temperatures of s…
The process of the reaction among elemental mercury (Hg 0 ) and reactive flue gas components across the selective catalytic reduction (SCR) catalyst was studied in a laboratory-scale reactor. Prepared vanadia-based SCR catalysts were characterized and analyzed to understand the potential reaction pathways. Mercury oxi…
The highly efficient nitridosilicate phosphors M 2 Si 5 N 8 (M = Sr, Ba, Eu) for phosphor-converted pc-LEDs were synthesized at low temperatures using a novel precursor route involving metal amides M(NH 2 ) 2 . These precursors have been synthesized by dissolution of the respective metals in supercritical ammonia at 1…