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Negative compressibility, negative Poisson's ratio, and stability
Abstract The role of negative compressibility is considered in detail. Experimental observations of negative bulk modulus in pre‐strained foam are presented and interpreted. A constrained microscopic model which exhibits negative compressibility is proposed. Some other negative and counterintuitive properties of matte…
Sulfosalt systematics: a review. Report of the sulfosalt sub-committee of the IMA Commission on Ore Mineralogy
International audience
Functionalization of carbon-based nanostructures with light transition-metal atoms for hydrogen storage
In a recent letter [T. Yildirim and S. Ciraci, Phys. Rev. Lett. 94, 175501 (2005)], the unusual hydrogen storage capacity of Ti decorated carbon nanotubes has been revealed. The present paper extends this study further to investigate the hydrogen uptake by light transition-metal atoms decorating various carbon-based n…
Synthesis and Properties of 3,8-Bis[4-(9H-carbazol-9-yl)phenyl]-1,10-phenanthroline for Phosphorescent OLEDs
Abstract A novel bipolar molecule, 3,8-bis[4-(9H-carbazol-9-yl)phenyl]-1,10-phenanthroline (CZPT) was synthesized and employed as the host in phosphorescent organic light-emitting devices (OLEDs). A maximum luminance of 7000 cd/m2 was achieved using fac-tris(2-phenylpyridine)iridium (Ir(ppy)3) as the emitting material.
Differential Substrate Specificity and Kinetic Behavior of Escherichia coli YfdW and Oxalobacter formigenes Formyl Coenzyme A Transferase
The yfdXWUVE operon appears to encode proteins that enhance the ability of Escherichia coli MG1655 to survive under acidic conditions. Although the molecular mechanisms underlying this phenotypic behavior remain to be elucidated, findings from structural genomic studies have shown that the structure of YfdW, the prote…
Equilibrium and dynamic behavior of a system containing a mixture of anionic and nonionic surfactants
Mixtures of the pure nonionic surfactant C12E3 and an anionic surfactant of the alkyl ethoxy sulfate type were studied. NaCl brine was added to these mixtures and the phase behavior was determined at 30°C as a function of surfactant composition and salinity. A larger range of compositions was found where the lamellar…
Charge Delocalization over Stacked π-Electron Systems
Abstract Cation radicals of oligomers and polymers of dibenzofulvene having a π-stacked conformation showed broad absorption bands based on charge resonance in near IR region, which red-shifted with increasing degree of polymerization, indicating that charge delocalization takes place through multiple, stacked fluoren…
Characterization of a PEO-PPO-PEO block copolymer system
The investigated EO27-PO39-EO27 triblock copolymer, Pluronics P-85, is a nonionic surface-active agent which has a monomeric molecular weight of 4600, of which 500% corresponds to the PEO component. P-85 exist in complex states of aggregation in aqueous solution. Monomers, micelles and larger aggregates (clusters) coe…
Spontaneous emulsification of oil drops containing surfactants and medium-chain alcohols
Spontaneous emulsification of mixtures of n -hexadecane, n -octanol, and the pure nonionic surfactant C 12 E 6 brought into contact with water was observed using videomicroscopy. Relevant aspects of equilibrium phase behavior in this system were determined, and information on emulsion drop size and stability was obtai…
Characterization of thermostable aminoacylase from hyperthermophilic archaeon Pyrococcus horikoshii
The gene encoding putative aminoacylase (ORF: PH0722) in the genome sequence of a hyperthermophilic archaeon, Pyrococcus horikoshii, was cloned and overexpressed in Escherichia coli. The recombinant enzyme was determined to be thermostable aminoacylase (PhoACY), forming a homotetramer. Purified PhoACY showed the abili…
Block copolymer in aqueous solution: Micelle formation and hard-sphere crystallization
The phase behavior of triblock-copolymers of poly(ethylene oxide) and poly(propylene oxide) dissolved in water shows unique characteristics: dissolved polymers at low temperature and low polymer concentration, spherical micellar aggregates at intermediate temperatures with a range in temperatures where both dissolved…
Liquid−Liquid Equilibria of (Limonene + Linalool + Ethylene Glycol or Diethylene Glycol or Triethylene Glycol or 1,2-Propylene Glycol) Ternary Systems
Liquid–liquid equilibrium (LLE) data of the solubility (binodal) curves and tie-line compositions were examined for mixtures of (limonene (1) + linalool (2) + ethylene glycol or diethylene glycol or triethylene glycol or 1,2-propylene glycol (3)) at 298.15 K and 101.3 ± 0.7 kPa. The relative mutual solubility of linal…
Analysis of SO2 Sorption Capacity of Rice Husk Ash (RHA)/CaO/NaOH Sorbents Using Response Surface Methodology (RSM): Untreated and Pretreated RHA
The SO2 sorption capacity (SSC) of sorbents prepared from rice husk ash (RHA) with NaOH as additive was studied in a fixed-bed reactor. The sorbents were prepared using a water hydration method by slurrying RHA, CaO, and NaOH. Response surface methodology (RSM) based on four-variable central composite face centered de…
Functionalized Hydrophobic and Hydrophilic Self-Assembled Supramolecular Rectangles
The synthesis of six new, functionalized 180 degrees pyridyl donor ligands and their coordination-driven self-assembly into supramolecular rectangles is reported. Three of the new donors have been functionalized with hydrophobic straight chain alkane units (C6, C12, and C18) while the remaining three have been functio…
Synthesis of CuII−RuII−CuII Trinuclear Complexes via Redox Reaction of Copper(I) Across Thiosemicarbazones Coordinated to Ruthenium(II)
Pyridine-2-carbaldehyde thiosemicarbazones [C5H4N1-C(H)N2-N3H-C(S)-N4HR, R = H, L1H2; CH3, L2H2-Me; CH2CH3, L3H2-Et] with Ru(PPh3)3Cl2 have formed mononuclear RuII precursors for the generation of trinuclear complexes. The reaction of 2 mol each of L1H2, L2H2-Me, or L3H2-Et with Ru(PPh3)3Cl2 in the presence of Et3N ha…
Coordination of a Uranium(IV) Sulfate Monomer in an Aqueous Solution and in the Solid State
UraniumIV sulfate in an aqueous solution and the solid state has been investigated with extended X-ray absorption fine structure (EXAFS) and X-ray diffraction (XRD). The coordination polyhedron comprises monodentate sulfate, bidentate sulfate, and water molecules. The coordination modes of sulfate in solution have bee…
Autothermal Catalytic Partial Oxidation of Bio-Oil Functional Groups: Esters and Acids
The catalytic conversion of esters and carboxylic acids into synthesis gas or chemicals could permit optimal utilization of organic intermediates such as pyrolysis bio-oils. To examine the ester moiety, two esters, ethyl lactate and ethyl propionate, and two acids, lactic acid and propionic acid, were reformed by cata…
Characteristics and Reactivity of Rapidly Hydrated Sorbent for Semidry Flue Gas Desulfurization
Semidry flue gas desulfurization with a rapidly hydrated sorbent was studied in a pilot-scale circulating fluidized bed (CFB) experimental facility. The desulfurization efficiency was measured for various operating parameters, including the sorbent recirculation rate and the water spray method. The experimental result…
Adsorption of polyelectrolytes on colloidal particles — Electrostatic interactions and stability behaviour
Adsorption isotherms of neutral poly(ethyleneoxide) (PEO), cationic poly-L-lysine (PLL) and homo- and copolymers of diallyl-dimethyl-ammoniumchloride (DADMAC) and N -methyl- N -vinyl-acetamide (NMVA) on colloidal silica and latex particles were determined from the concentration in the supernatant solution. Layer thick…