Materials Literature
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Magnetic liquid marbles capable of hosting both aqueous and organic fluids may serve as new miniature chemical reactors. Chemical reactions can occur either within a single liquid marble or between two magnetic liquid marbles (as illustrated). The liquid marbles can also interact with external devices simply by openin…
A series of Yb/Tm co-doped NaGdF4 nanoparticles without or with a thin surface protection layer provide direct evidence of a surface quenching effect on size-dependent upconversion luminescence (see picture). The coating preserves the optical integrity of the nanoparticles (right-hand spectrum) and minimizes emission…
A cathodoluminescence-based, contactless method for extracting the bulk minority carrier diffusion length and reduced recombination velocity of an individual grain boundary is applied to vapor grown CdTe epitaxial films. The measured diffusion length was within the range of 0.4–0.6 μm and the grain boundary recombinat…
Strategically placing secondary dialkylammonium recognition sites at the magic distance of 3.5 Å apart in the dumbbell components of a series of oligorotaxanes (see picture) renders otherwise conformationally floppy [n]rotaxanes rigid and rodlike. These oligorotaxanes form with near-quantitative conversion under therm…
Herein, we present a Ca-based metal-organic framework named AEPF-1, which is an active and selective catalyst in olefin hydrogenation reactions. AEPF-1 exhibits a phase transition upon desorption of guest molecules. This structural transformation takes place by a crystal to crystal transformation accompanied by the lo…
Contributors. Preface. Robert Simha: A Life with Polymers (Ivan G. Oterness and Alexander M. Jamieson). PART I Rheology. 1 Newtonian Viscosity of Dilute, Semidilute and Concentrated Polymer Solutions (Alexander M. Jamieson and Robert Simha). 2 Polymer and Surfactant Drag Reduction in Turbulent Flows (Jacques L. Zakin…
Standard models for simple metals and insulators often fail for systems based on elements with unstable d- or f-electron shells, where strong electronic correlations can generate new and unexpected states of matter. Such a scenario can often be induced when a magnetic phase transition is tuned to absolute zero tempera…
A new flexible bowl-shaped zwitterionic complex, 1,1′,1′′-(2,4,6-trimethylbenzene-1,3,5-triyl)tris(methylene)tris(4-carboxypyridinium) tribromide (H 3 L Br 3 ) was designed and synthesized, which was subsequently used as an efficient ligand to construct four interesting coordination polymers of [Cu 2 Cl 2 L 2 (H 2 O)…
Based on quasi-steady-state photoluminescence, we present an approach to extract minority carrier lifetime from silicon wafers without a priori information about any material parameter (e.g., dopant concentration or mobility). A sinusoidal oscillation of irradiation of a silicon sample in time stimulates a likewise os…
We report the structural transitions of pyridine as a function of pressure up to 26 GPa using in situ Raman spectroscopy and infrared absorption spectroscopy. By monitoring changes in the Raman shifts in the lattice region as well as the band profiles in both Raman and IR spectra, a liquid-to-solid transition at 1 GPa…
Ground-about: The ruthenium(II) complex [RuCl{N(CH2CH2PtBu2)2}] (B) is obtained in high yield by the reaction of [RuCl2{HN(CH2CH2PtBu2)2}] (A) with KOtBu. Complex B exhibits an unusual electronic low-spin (S=0) ground-state configuration. Comparison with Caulton's [RuCl{N(SiMe2CH2PtBu2)2}] (ground state: S=1) shows th…
A photoluminescence (PL)-based oxygen and glucose sensor utilizing inorganic or organic light emitting diode as the light source, and polythiophene: fullerene type bulk-heterojunction devices as photodetectors, for both intensity and decay-time based monitoring of the sensing element's PL. The sensing element is based…
Poly(phenylacetylene) with rationally designed urea groups was demonstrated to be a superior anion receptor possessing both a colorimetric response ability and a positive homotropic allosteric binding mode. The target polymer, poly(phenylacetylene) with [bis(trifluoromethyl)phenyl]urea pendants (poly- 1 ), was synthes…
Concentration is critical: Amine/isocyanate polycondensation below the critical gelation concentration cg affords a sol of growing microporous molecular-network nanoparticles rather than a gelated network (see picture, for model of particle: NCO red, NH2 blue, tetrahedral cross-link point gray). Further growth to form…
New soluble quinacridone-based molecules have been developed as electron donor materials for solution-processed organic solar cells. By functionalizing the pristine pigment core of quinacridone with solubilizing alkyl chains and light absorbing/charge transporting thiophene units, i.e., bithiophene (BT) and thienylben…
This paper reports the electron transport characteristics of carbon/molecule/Cu molecular junctions, where aromatic molecules (azobenzene or AB and nitroazobenzene or NAB) are employed as the molecular component. It is shown that these devices can be made with high yield (>90%), display excellent reproducibility, and…
In-situ direct mechanistic transformation from living radical to cationic polymerization was investigated using a trithiocarbonate-type reversible addition−fragmentation chain-transfer (RAFT) agent and an azo-initiator for RAFT polymerization of (meth)acrylates followed by the addition of a Lewis acid catalyst for the…
We have designed, synthesized, and evaluated 5-benzylidenerhodanine- and 5-benzylidenethiazolidine-2,4-dione-based compounds as inhibitors of bacterial enzyme MurD with E. coli IC(50) in the range 45-206 μM. The high-resolution crystal structure of MurD in complex with (R,Z)-2-(3-[{4-([2,4-dioxothiazolidin-5-ylidene]m…
We have demonstrated pressure-directed assembly for preparation of a new class of chemically and mechanically stable gold nanostructures through high pressure-driven sintering of nanoparticle assemblies at room temperature. We show that under a hydrostatic pressure field, the unit cell dimension of a 3D ordered nanopa…
Aromatic hydrocarbons comprise 20% of non-methane volatile organic compounds in urban areas and are transformed mainly by atmospheric chemical reactions with OH radicals during daytime. In this work we have measured the formation yields of glyoxal and methylglyoxal from the OH radical-initiated reactions of toluene, x…