Materials Literature
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The multilayer films of branched polyethyleneimine (BPEI) and poly(acrylic acid) (PAA) have been fabricated with the layer-by-layer (LbL) method. Two characteristic courses of the film thickness growth are observed, which are the initial exponential-like growth and the following linear growth. The variation of the COO…
A monolayer of 20 nm sized Fe3C nanoparticles encapsulated by graphite was fabricated by heat treating a polyimide/Fe/polyimide thin-film stack. Transmission electron microscopy and Raman spectroscopy confirmed the graphitization of the polyimide film in the vicinity of the Fe3C particles when annealed above 600 °C. C…
The effect of varying R =[CaO]/([CaO]+[Na 2 O]) ratio on the crystallization of a rare earth‐rich aluminoborosilicate glass (16 wt% RE 2 O 3 , RE=Nd or La) is investigated. The crystallization of a silicate apatite with Ca 2+ x RE 8− x (SiO 4 ) 6 O 2−0.5 x composition ( x ≈0.4–0.7), is responsible for a drop of the ra…
[reaction: see text] A novel cyclic tri-beta-peptide having terpyridine (tpy) metal ligands was synthesized to investigate its assembly formation and metal complexation. Microscopic observation revealed that this cyclic peptide formed a rod-shaped molecular assembly. The assembly was able to bind Cu(II) because the tp…
We present experimental results on the characterization of the mechanical properties of pyrolysed poly-furfuryl alcohol (PFA) nanofibres. Specifically, Young’s modulus and the fracture strain of the nanofibres were measured by performing uni-axial tensile experiments on individual nanofibres in situ in a scanning elec…
In recent years, major progress has been achieved in developing novel approaches to interpret small-angle scattering data from solutions of biological macromolecules in terms of three-dimensional models. These advanced methods include: ab initio low-resolution shape and domain structure determination; modelling of qua…
We have grown the charge-transfer salt of the electron acceptor 7,7,8,8-tetracyanoquinodimethane (TCNQ) and the electron donor tetracene using physical vapor transport. The crystal structure was solved by single-crystal X-ray diffraction and the symmetry was found to be triclinic (space group P 1̄). The 1:1 complex gr…
A novel, effective strategy named 'seed catalysis' has been described here to synthesize silver nanostructures with controllable morphology. Typically, we added Na 2 S into the reaction system and the Ag 2 S semiconductor colloids formed at the initial stage would act as both seeds and catalyst in the silver reduction…
Polyaniline (PANI) nanotubes were obtained by a self-assembly process, from a solution containing poly(methyl vinyl ether- alt -maleic acid) (PMVEA) by oxidative polymerization using ammonium persulfate as the oxidant. The size of the nanotubes was greatly affected by the weight ratio of polymeric acid to aniline as m…
Functionalized nanoporous alumina is applied in single-molecule fluorescence detection in nanoscale confinement (see schematic image). The confinement leads to apparent 1D diffusion with up to 19-fold prolonged diffusion times through the focus. Single-molecule fluorescence in porous alumina is a promising tool for th…
The surface chemistry of pristine, 6-nm silicon nanoparticles has been investigated. The particles were produced in an RF plasma and studied using a tandem differential mobility analysis apparatus, Fourier transform infrared spectroscopy (FTIR), time-of-flight secondary ion mass spectrometry (ToF-SIMS), and transmissi…
Sintering of a ZnO–SnO2 mixture under argon flow leads to the growth of microrods on the sample surface, which are formed by oriented stacks of nanoplates. Energy dispersive spectroscopy and cathodoluminescence (CL) in the scanning electron microscope show that the stacks of nanoplates consist of Sn doped ZnO. The sta…
Oxidation of 5,10,15,20-tetramesitylporphyrinatoiron(III) perchlorate, (TMP)FeIII(ClO4), with ferric perchlorate in acetonitrile gave a metastable species identified as (TMP)FeIV(ClO4)2 that decayed within seconds to the known isomeric species (TMP*+)FeIII(ClO4)2. Irradiation of the metastable species with 355 nm lase…
Recently, interest in magnetic particles, particularly in the nanometre-size range, has increased significantly. The main driving forces behind this interest are both the development of improved synthesis techniques and an increase in the number of potential applications for suitable magnetic nanoparticles. A critical…
Abstract Polyhedral oligomeric silsesquioxanes (POSS) epoxy hybrid composites have attracted much research interest because of their unique structure, versatile synthetic approaches, and changeable properties through molecular tailoring. Octakis(dimethylsiloxypropylglycidyl ether)silsesquioxane and octakis(dimethylsil…
Single crystals of AxBa8-xAl14Si31 (A = Sr, Eu) were grown using a molten Al flux technique. Single-crystal X-ray diffraction confirms that AxBa8-xAl14Si31 (A = Sr, Eu) crystallize with the type I clathrate structure, and phase purity was determined with powder X-ray diffraction. Stoichiometry was determined to be Sr0…
Cuprous oxide (Cu2O) was grown on SrTiO3 (STO)(100) by oxygen plasma-assisted molecular-beam epitaxy. The microstructure of the grown layer and the Cu valence state were analysed using x-ray diffraction (XRD), x-ray photo-electron spectroscopy (XPS), atomic force microscopy (AFM) and cross-sectional transmission elect…
High Resolution Image Download MS PowerPoint Slide Ordered homogeneous arrays of nickel (II) oxide nanotubes have been fabricated through an MOCVD template route using Ni(tta) 2 tmeda (Htta = 2 thenoyl-trifluoroacetone, tmeda = tetramethylendiamine) as a source. The X-ray diffraction pattern shows the formation of the…
What makes it go linear? The synthesis of the first polycyanide compounds of a 5f element (see picture, U green, N blue, C white) supports the idea that the geometry of metallocenes depends on both the metal oxidation state and the size and shape of the equatorial ligands. Theoretical investigations reveal that the st…
A straightforward and simple way to produce well‐densified ferroelectric ceramic composites with a full control of both architecture and properties using spark plasma sintering (SPS) is proposed. SPS main outcome is indeed to obtain high densification at relatively low temperatures and short treatment times thus limit…