Materials Literature
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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…
Synthesis and characteristic properties of polymers P-1−P-3 are described containing the 2,3,5,6-tetraarylated pyrrolo[3,4- c ]pyrrole-1,4-dione unit in the main chain. P-1 is prepared from 2,5-bis(4- t -butylphenyl)-3,6-bis(4′-bromophenyl)pyrrolo[3,4- c ]pyrrole-1,4-dione (DPP1) and 9,9-di- n -hexylfluorene-2,7′-bisp…
Comb block copolymers are a relatively new architecture of polymer whose assembly into ordered morphologies in the solid state is largely unexplored. Thirty-two comb block copolymers with molecular weights from 168 to 4200 kg mol −1 were synthesized and assembled in the solid state into ordered morphologies with domai…
We perform molecular dynamics simulations to study the dielectric relaxation of a bead−spring model for a polymer melt in the bulk and in supported films. By assigning dipole moments parallel and perpendicular to the backbone of all chains in the completed simulation trajectories, we calculate the dielectric spectra o…
Single-walled carbon nanotubes (SWNTs) were mechanically milled with lithium borohydride (LiBH 4 ) and examined with respect to its effect on the reversible dehydrogenation reactions of LiBH 4 . It was found that as-prepared SWNTs possess pronounced promoting effects on the dehydrogenation/rehydrogenation reactions of…
In recent years, energy transfer (ET) using semiconductor quantum dots (QDs) is getting increased attention. However, it has been postulated that ET between QDs is based on the F\"orster model, which is a well-established model of ET mechanism in organic dye systems, without verification. In this work, we have investi…
A selective growth method for ZnO vertical nanowire arrays is demonstrated using self-assembled gold nanoparticles as the growth catalyst. Gold nanoparticles functionalized with bifunctional (thiol-phosphonic acid) ligands assemble rapidly and selectively onto a patterned ZnO seed layer. Vertical ZnO nanowire arrays a…
Peroxide-based explosives, like triacetone triperoxide (TATP), are important targets for detection because of their broad use in improvised explosives but pose challenges. We report a highly sensitive turn-on fluorescence detection for H2O2 and organic peroxides, including TATP. The detection strategy relies on oxidat…
In this paper, we demonstrate the first all-organic, transparent, flexible, versatile colour displays based upon triplet–triplet annihilation assisted photon energy upconversion in viscous polymeric matrix. The devices work with ultra-low excitation intensities down to 20 mW cm −2 red or near-IR light. The displays ar…