Materials Literature
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Electrospun starch acetate (SA) nanofibers with different degrees of substitution (DS) have been developed using formic acid/water as solvents, and their properties and potential applications in drug delivery have been studied. Although SA is biodegradable, biocompatible, and inexpensive, the mechanical properties and…
I see UC UV! Gd3+/Tm3+/Yb3+- and Ce3+/Tm3+/Yb3+-doped LiYF4 nanocrystals are capable of generating UV, visible, and NIR upconversion (UC) emissions following λ=980 nm excitation (see figure). Gd3+ and Ce3+ can be sensitized by the Tm3+ ion, which results in UV upconversion in the region of λ=280–340 nm, making them at…
The 270-nm optical-absorption band is seen in a wide variety of diamonds but there are conflicting opinions about its relationship with the common substitutional nitrogen center. Here we use density-functional theory to show that in addition to a deep donor level, substitutional nitrogen has an acceptor level lying in…
A convenient two-step protocol is presented for synthesis of linear-hyperbranched diblock copolymers consisting of a linear, organometallic poly(ferrocenylsilane) (PFS) block and hyperbranched poly(carbosilane) (hbPCS) segments. Linear PFS diblock copolymers were synthesized through photolytic ring-opening polymerizat…
We report that the pressure-temperature phase diagram of single-crystalline SrFe$_2$As$_2$ is easily affected by the hydrostaticity of a pressure-transmitting medium. For all of the three mediums we used, superconductivity with zero resistance appears, accompanied by the suppression of an antiferromagnetic (orthorhomb…
Abstract Copper oxide thin films were obtained by annealing (temperature ranging between 100 and 450 °C) the metallic Cu films deposited on glass substrates by e‐beam evaporation. XRD studies confirmed that the cubic Cu phase of the as‐deposited films changes into single cubic Cu 2 O phase and single monoclinic CuO ph…
Nanosilver on a string: Crystalline silver polyoxovanadate supramolecular architectures are employed as precursors for the synthesis of composite nanowires (see scheme). The nanostructures are composed of semiconducting vanadium oxide which forms wires with high aspect ratios, and are embedded with metallic silver nan…
A variety of measurements using a differential scanning calorimeter were used to probe how single-walled carbon nanotubes (SWCNTs) affect polymer dynamics associated with the glass transition. Tubes were dispersed in N, N -dimethylformamide containing dissolved polystyrene, and precipitation was quickly forced by the…
Abstract Mechanical properties and glass transitions of cross‐linked polymer networks depend strongly on both the network topology and cross‐linking density. A model is developed using a dynamic cross‐linking approach based on a cutoff distance criterion followed by a high‐temperature annealing procedure. The analysis…
ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication to the EditorNEXTOne-Step Synthesis of Donor−Acceptor type Conjugated Polymers from Ferrocene-Containing Poly(aryleneethynylene)sTsuyoshi Michinobu*†‡, Hiroe Kumazawa§, Keiichi Noguchi§, and Kiyotaka Shigehara§View Author Information† Global Edge Instit…
The plethora of lattice and electronic behaviors in ferroelectric and multiferroic materials and heterostructures opens vistas into novel physical phenomena including magnetoelectric coupling and ferroelectric tunneling. The development of new classes of electronic, energy-storage, and information-technology devices d…
Stable aqueous monodispersed silver nanoparticles were synthesised by reducing silver nitrate using various sugars such as glucose, fructose, lactose, and sucrose at 55-60 oC. A mixture of two stabilising agents, polyvinyl pyrrolidone (PVP) of molecular weight (MW 40, 000) and gelatin plays a decisive part in controll…
The perovskite-type oxide catalyst LaFe(1-x)Cu(x)O(3 )(x=0, 0.1, 0.2) was prepared by the sol-gel method, and tested as a catalyst in the wet aerobic oxidation (WAO) of lignin into aromatic aldehydes. The lignin conversion and the yield of each aromatic aldehyde were significantly enhanced in the catalytic process, co…
We report the ac magnetic susceptibility $\chi_{ac}$ and resistivity $\rho$ measurements of EuFe$_2$As$_2$ under high pressure $P$. By observing nearly 100% superconducting shielding and zero resistivity at $P$ = 28 kbar, we establish that $P$-induced superconductivity occurs at $T_c \sim$~30 K in EuFe$_2$As$_2$. $\rh…
Abstract The IR‐ and Raman spectra of copper phthalocyanine (CuPc), as well as the isotopic wavenumber shifts upon 15 N substitution in CuPc, were investigated experimentally and theoretically. The symmetry of molecular vibrations was determined using polarized Raman spectra of an oriented CuPc single crystal. Density…
Zinc phthalocyanine-perylenebisimide pentameric arrays, ZnPc(PDI)(4) 1 and 2, have been synthesized. ZnPc(PDI)(4) 1 has no substituents in the PDI bay positions, while ZnPc(PDI)(4) 2 presents four phenoxy groups in the bay positions of each perylene. In both cases, the PDI moieties are directly connected to the ZnPc.…
This study reports on a direct approach of quantitatively probing the nanotribological response of chemically end-grafted polyions. A combination of a quartz crystal microbalance with dissipation and atomic force microscopy, in the now well established colloidal probe mode, was utilized to investigate the stimuli-indu…
Reaction of CuCl(2) x 2 H(2)O and trivacant Keggin polyoxoanion Na(9)[A-alpha-PW(9)O(34)] x 7 H(2)O in the presence of ethylene-diamine/1,2-diaminopropane (en/enMe) under hydrothermal conditions led to five novel inorganic-organic hybrid polyoxotungstates (POTs):[Cu(en)(2)](2)[Cu(en)(2)(H(2)O)](2)[Cu(H(2)O)(2)][Cu(4)(…
Diazonium salt chemistry and atom transfer radical polymerization (ATRP) were combined in view of preparing new bioactive hairy diamond nanoparticles containing, or potentially containing, nitrogen-vacancy (NV) fluorescent centers (fluorescent nanodiamonds, or fNDs). fNDs were modified by ATRP initiators using the ele…
We describe simple procedures to obtain near monochiral samples of several single-walled carbon nanotube (SWNT) species starting from SWNT raw material. (7,5), (7,6), (10,5), and (9,7) nanotubes were obtained with respective enrichments of up to ∼90% (as estimated from photoluminescence and absorption spectra) by thei…