Materials Literature
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The present article deals with synthesis of phenol-formaldehyde (PF) matrix-based composites using raw flax and flax graft copolymers as reinforcing agents. Prior to use of the graft copolymer as reinforcing material, its strength vis-à-vis that of raw flax was studied. Composites thus prepared were subjected to the e…
Electronic waveguides in graphene formed by counterpropagating snake states in suitable inhomogeneous magnetic fields are shown to constitute a realization of a Tomonaga-Luttinger liquid. Due to the spatial separation of the right- and left-moving snake states, this non-Fermi liquid state induced by electron-electron…
Pores for thought: The formation of nanostructured TiO2 films is templated by dendritic amphiphilic core–double-shell macromolecules. The templates consist of a hydrophobic polystyrene (PS) interior and a hydrophilic poly(acrylic acid) (PA) exterior (see picture). The pore size of the films can be controlled by adjust…
A molecular vise: The purple-colored bis(tert-butylscorpionate) iron(II) complex is fully low-spin at room temperature, despite the steric hindrance brought about by the six methyl groups in the equatorial belt. The remotely situated bulky tert-butyl substituent on boron acts like a locking screw for a vise, forcing t…
Abstract The synergistic effects of phosphorus–silicon in a caged bicyclic phosphate quadridentate silicon complex (CPQS) on the flame retardancy of epoxy resin (EP) were studied with the limiting oxygen index, the UL‐94 test, thermogravimetric analysis, real time Fourier transform infrared spectroscopy, X‐ray powder…
The unprecedented ternary Te-Fe-Cu chain polymers [{Et4N}{TeFe3(CO)9Cu}]infinity and [{TeFe3(CO)9Cu2}(mu-4,4'-dipyridyl)1.5]infinity were prepared from the self-assembly of [Et4N]2[TeFe3(CO)9] with [Cu(MeCN)4][BF4] in THF or in the presence of 4,4'-dipyridyl in THF. These two chain polymers, which can also be construc…
The charge distribution in low density pyethylene and polyimide films under a quasi-mono-energetic electron beam irradiation in the range [5–400 keV] is analysed using a new experimental set-up based on the pulsed electro-acoustic (PEA) method. The device allows measurements without any physical contact between the ex…
The synthesis and reactivity of a series of sodium and rare-earth metal complexes stabilized by a dianionic N-aryloxo-functionalized beta-ketoiminate ligand were presented. The reaction of acetylacetone with 1 equiv of 2-amino-4-methylphenol in absolute ethanol gave the compound 4-(2-hydroxy-5-methylphenyl)imino-2-pen…
Atomic-resolution structures from small proteins have recently been determined from high-quality powder diffraction patterns using a combination of stereochemical restraints and Rietveld refinement [Von Dreele (2007), J. Appl. Cryst. 40, 133-143; Margiolaki et al. (2007), J. Am. Chem. Soc. 129, 11865-11871]. While pow…
We derive the dispersion relation of Bloch modes in a fishnet metamaterial in the optical frequency domain. The dependence of the longitudinal wave vector component on the transverse one and the frequency, which governs diffraction and dispersive spreading of localized light excitations, respectively, are analyzed. We…
The relaxation of electronically excited porphycene in acetonitrile solution has been studied by transient absorption spectroscopy supported by global analysis techniques. Three processes following the femtosecond pulse excitation to the S 2 state have been identified: the intramolecular vibrational redistribution on…
Yuan-Fu Denga* & Zhao-Hui Zhoub a Department of Chemistry, College of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou, 510640, P.R. China b Department of Chemistry, College of Chemistry and Chemical Engineering and State Key Laboratory for Physical Chemistry of Solid Surfaces , Xi…
The mononuclear macrocyclic complexes [Au(I)([9]aneS2O)2]BF4 x MeCN 1a, [Au(II)([9]aneS2O)2](BF4)2 x 2 MeCN 2a, and [Au(III)([9]aneS2O)2](ClO4)6(H5O2)(H3O)2 3 ([9]aneS2O = 1-oxa-4,7-dithiacyclononane) have been prepared and structurally characterized by single crystal X-ray crystallography. The oxidation of [Au([9]ane…
Reaction of cis- or trans -Pt(PPh 3 ) 2 Cl 2 (PPh 3 = triphenylphosphine) with 5-[2-(trimethylsilyl)-1-ethynyl]-2,2′-bipyridine (bpyC≡CSiMe 3 ) gave cis- Pt(PPh 3 ) 2 (C≡Cbpy) 2 ( 1 ) or trans -Pt(PPh 3 ) 2 (C≡bpy) 2 ( 5 ). Incorporating 1 or 5 with Ln(hfac) 3 (H 2 O) 2 (hfac = hexafluoroacetylacetonate) induced forma…
Individual ${\text{Mn}}_{12}$ single-molecule magnets have been investigated by means of scanning tunneling spectroscopy at room temperature. Current-voltage characteristics of a ${\text{Mn}}_{12}$ derivative are studied in detail and compared with simulations. A few-parameter scalar model for ballistic current flow t…
Abstract Submicrometer fibers of poly(vinyl alcohol) (PVA) and chitosan oligosaccharide [COS; i.e., (1→4)‐2‐amino‐2‐deoxy‐β‐ D ‐glucose] were prepared by an electrospinning method with aqueous solutions with polymer concentrations of 7.5–15 wt %. Scanning electron microscopy, Fourier transform infrared, X‐ray diffract…
Abstract Mesoporöse Silicate (MPS) haben eine geordnete Porenstruktur mit ähnlichen Abmessungen wie viele biologische Moleküle. Sie sind als Trägermaterialien für Proteine und Enzyme in biokatalytischen Anwendungen eingehend untersucht worden. Seit ihrer Entdeckung ist es gelungen, durch neue Syntheseverfahren die Grö…
Fast formation and efficient stabilization of silver nanoparticles from [Ag(NH3)2]OH are achieved in concentrated nonpolar solutions of amphiphilic invertible polyesters based on poly(ethylene oxide) (PEO) and aliphatic dicarboxylic acids. Surface-modified silver nanoparticles able to be dispersed in both a polar and…
The optical properties of thin silver films fabricated by the oblique angle deposition method are investigated. The localized surface plasmon resonance (LSPR) wavelength can be easily tuned from 401 to 666 nm in the visible range by changing the film thickness from 5 to 100 nm and the deposition angle from 0 to 85°. A…
Spiders routinely produce multiple types of silk; however, common wisdom has held that insect species produce one type of silk each. This work reports that the green lacewing ( Mallada signata, Neuroptera) produces two distinct classes of silk. We identified and sequenced the gene that encodes the major protein compon…