Materials Literature
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A series of zinc(II) diimine bis(thiolate) complexes with photochromic diarylethene-containing phenanthroline ligands was synthesized, and their photophysical and photochromic properties were studied. The X-ray crystal structures of two of these complexes have been characterized. All complexes exhibit strong 3LLCT pho…
Abstract The achievement of structural control over thioether‐bridged mesoporous organosilicas is reported. The mesoporous materials have been synthesized by co‐condensation of bis[3‐(triethoxysilyl)propyl]tetrasulfide (TESPTS) and tetramethoxysilane (TMOS) in acetic acid/sodium acetate buffer solution (HAc–NaAc, pH 4…
Amphiphilic, PEGylated gold nanoparticles, of approximately 2 nm average core diameter, were synthesized by reduction of hydrogen tetrachloroaurate in the presence of the ligand (1-mercaptoundec-11-yl)tetra(ethylene glycol). These PEGylated gold nanoparticles were found to assemble cleanly at the oil-water interface.…
The synthesis of a variety of well-defined diblock copolymer brushes, including poly(methyl methacrylate) (PMMA)- b -poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA), PMMA- b -poly(styrene) (PSty), and PSty- b -poly(methyl acrylate), was achieved via surface immobilized reversible addition−fragmentation chain trans…
Abstract By employing commercial poly(ethylene oxide)–poly(propylene oxide)–poly(ethylene oxide) (PEO–PPO–PEO) block copolymers as templates in near‐neutral aqueous solutions in the absence of organic cosolvents, unilamellar siliceous vesicles and nanofoams with ultrahigh pore volumes (> 3 cm 3 g –1 ) are successfu…
High Resolution Image Download MS PowerPoint Slide Real-time in situ Raman spectroscopy is used to probe the near-surface structure of α-Mn 2 O 3 nanocrystals during methane combustion for the first time. A surface phase-transformation from α-Mn 2 O 3 to Mn 3 O 4 -like species, as evidenced by the formation of a singl…
As a step toward the elucidation of the mechanistic pathways governing the known bioactivity of polyoxometalates (POMs), two representative molecules of this class of chemicals, the wheel-shaped [NaP(5)W(30)O(110)]14- (P(5)W(30)) and the Keggin-type anion [H(2)W(12)O(40)]6- (H(2)W(12)), are shown, by two independent t…
An inert Pt(II)−py bond (py = pyridyl) is considerably labilized upon UV irradiation. On the basis of this phenomenon, a kinetically inert Pt(II)-linked coordination ring is rapidly catenated on irradiation via Pt(II)−py photodissociation.
Various properties of ceramics can be significantly influenced by the presence of grain boundaries. The influence on the properties is closely related to the grain‐boundary atomic structures. As different grain boundaries have different atomic structure, different grain boundaries have different influence on the prope…
The optical constants of vanadium dioxide (VO 2 ) films were determined at visible and near-infrared wavelengths at various temperatures during a semiconductive–metallic phase transition by ellipsometric analysis with Lorentz-oscillator formulae. The reversible changes in optical constants against temperature due to t…
Abstract Mesostructured wurtzite ZnS‐nanowire‐bundle/amine nanocomposites displaying remarkable quantum size effects are synthesized by using a mild‐solution reaction using different amines, such as n ‐butylamine, ethylamine, and tetraethylenepentamine, Zn(NO 3 ) 2 ·6 H 2 O, and CS(NH 2 ) 2 or Na 2 S·9 H 2 O as the pr…
Single crystals of the new ternary carbides Ta4AlC3 and Ta3AlC2 were synthesized from molten aluminum and characterized XRD, EDX, and WDX measurements. Crystal structures were refined for the first time on the basis of single-crystal data. Both compounds crystallize in a hexagonal structure with space group P63/mmc an…
Hydroxyethyl starch (HES) is a water soluble semisynthetic polysaccharide that is used as a plasma volume expander and cryoprotectant. In order to produce a fully biodegradable amphiphilic polymer, HES was esterified with lauric, palmitic, and stearic acids under mild reaction conditions using dicyclohexyl carbodiimid…
We present a Coherent X-ray Diffraction study of the antiferrodistortive displacive transition of SrTiO$_3$, a prototypical example of a phase transition for which the critical fluctuations exhibit two length scales and two time scales. From the microbeam x-ray coherent diffraction patterns, we show that the broad (sh…
A tadpole shaped poly(ε-caprolactone) (PCL; M n = 24 500) was made amphiphilic by grafting the two PCL tails with PEO. In the first step, a macrocyclic PCL was synthesized by ring-opening polymerization of ε-caprolactone (εCL) initiated by a cyclic tin(IV) dialkoxide and stabilized by local intramolecular photo-cross-…
The past decade has witnessed a substantial increase in research on synthesis techniques for pure and doped carbon nanotubes and their involved parameters. However, there is a missing link between the ideal synthesis conditions for high quality functionalized structures with heteroatoms such as nitrogen and the format…
Carbon nano-onions (CNO) are made of concentric fullerene-like shells and range from double- and triple- to multilayered structures. They remain the least studied allotrope of carbon yet. In the present study, a one-step process for functionalization of CNO (50−100 nm diameter) by addition of fluorine through direct f…
This review of tendon/collagen structure shows that the orientational variation in MRI signals from tendon, which is referred to as the "magic angle" (MA) effect, is caused by irreducible separation of charges on the main chain of the collagen molecule. These charges are held apart in a vacuum by stereotactic restrict…
We report the observation of a current-driven metal (M)-insulator (I) phase oscillation in two-terminal devices incorporating individual WxV1-xO2 nanobeams connected to parallel shunt capacitors. The frequency of the phase oscillation reaches above 5 MHz for approximately 1 mum long devices. The M-I phase oscillation,…
Amide proton transfer (APT) imaging employs the chemical exchange saturation transfer (CEST) mechanism to detect mobile endogenous proteins and peptides. It can be used to detect pH reduction during acute ischemia and thus provide complementary information to perfusion-weighted (PWI) and diffusion-weighted (DWI) imagi…