Materials Literature
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Transient absorption results are presented on two types of GaSe nanoparticle aggregates. The results indicate that both types of aggregates exhibit larger emission oscillator strengths than the corresponding monomers, that is, superradiance. One type of GaSe nanoparticle is synthesized by conventional methods, and the…
The catalytic hydrogermylation of Si(CH CH 2 ) 4 with Ph 3 GeH yielded Si(CH 2 CH 2 GePh 3 ) 4 ( 1 ). In contrast, Sn(CH CH 2 ) 4 and Sn(CH 2 CH CH 2 ) 4 reacted with Ph 3 GeH under the same conditions, forming Ph 3 Ge(CH 2 ) 2 GePh 3 ( 2 ) and Ph 3 Ge(CH 2 ) 3 GePh 3 ( 3 ), respectively, whereas the reaction of Sn(CH…
Thin film honeycomb materials were prepared from regioselectively modified celluloses. The method uses water condensation at the surface of a cellulosic solution as an ordered template to form honeycomb structures. Pore size and distribution is controlled by several factors, one of which is the hydrophilicity of the c…
High Resolution Image Download MS PowerPoint Slide The self-assembly of discotic molecules of a metal-free alkoxy-substituted phthalocyanine derivative, 2,3,9,10,16,17,23,24-octakis(octyloxy)-29H,31H-phthalocyanine, in organic solvents was studied by optical microscopy, UV−vis spectroscopy, and scanning electron micro…
We performed neutron reflectometry (NR) and total internal reflection fluorescence (TIRF) spectroscopy to characterize the structure and the protein binding capacity of a planar poly(acrylic acid) (PAA) brush at different temperatures. A PAA brush was prepared by spin-coating planar quartz or silicon wafers with a thi…
Benzoic acid solubility has been measured in pure water and in the binary mixtures containing different solvents including water, N, N -dimethylformamide (DMF), ethanol, or 1,4-dioxane. The experiments were carried out employing the cell used in Oliveira's dissertation. The temperature dependence of the solubility of…
A new series of relatively flexible cofacial donor-acceptor dyads for singlet-singlet energy transfer with the corrole or etio-porphyrin free base and zinc porphyrin as the acceptor and donor, respectively, were synthesized and characterized (represented as (PMes2COx)ZnH3 (13), (PMes2CO)ZnH3 (14), and (PMes2CX)ZnH3 (1…
Numerous approaches have been reported for the synthesis of CdSe nanocrystals, but there is no effective facile method for the synthesis of high-quality large, red-emitting CdSe nanocrystals. Herein we report a convenient and reproducible approach for the preparation of high-quality (high luminescent quantum yield, ne…
To seek novel metal-free organic catalysts for epoxidation with high stereoselectivity, a series of 4-substituted-alpha,alpha-diaryl-prolinols were synthesized in four steps from trans-4-hydroxyl-L-proline. These prolinol derivatives catalyzed the asymmetric epoxidation of alpha,beta-enones to give the corresponding c…
Pt is the most common catalyst for NO oxidation to NO 2, a key reaction in NO x remediation chemistry. In this work, density functional theory calculations and plane-wave supercell models are used to calculate the energies, charge distributions, and vibrational spectra of the stable and metastable states of adsorbed N…
We present a continuous time random walk model for the Portevin-Le Chatelier (PLC) effect. From our result it is shown that the dynamics of the PLC band can be explained in terms of the Levy Walk.
Nanocrystalline nanowires (NCNW) are fragments of bulk crystals that are infinite in only one direction. A construction is given for calculating eigenstates belonging to the symmetry labels (k,m) (wavevector and rotational quantum number). Vibrational harmonic eigenstates are worked out explicitly for a simple model,…
Stepwise addition/elimination and concerted mechanisms for the methanolysis of ε-caprolactone, as a model for the initiation and propagation of ring-opening polymerization (ROP), have been investigated computationally using the B3LYP/6-31G* density functional method, with assistance from one or two ancillary methanol…
This paper describes the preparation of two tetracations 4a(4+) and 4b(4+) composed of di(1-azulenyl)methylium units based on a new structural principle of a cyanine-cyanine hybrid for the design of electrochromic materials with two color changes. Di- and monocations 5a(2+), 5b(2+) and 6a+, 6b+ composed of di(1-azulen…
Density functional theory calculations carried out on the anionic Ni(II) chain complexes {trinickeltetrakis[2,6-bis(amido)pyridine]}2- and {trinickeltetrakis[N,N'-bis(sulfonyl)pyridyldiamido]}2- show that the electron-attractor character of the sulfonyl substituent modifies the basicity of the amido ligand ends so as…
This paper describes the growth of gold and silver nanomaterials from their corresponding colloidal seeds on glass substrates. The glass substrates were treated with 3-mercaptopropyltrimethoxysilane (MPTMS) and then with gold or silver nanoparticle seeds (AuNPSs or AgNPSs) at different concentrations. After separately…
A series of novel heterocyclic combinatorial libraries containing 4H-thieno[3,2-b]pyrrole, thieno[2',3':4,5]-pyrrol[1,2-d][1,2,4]triazine and thieno[2',3':4,5]pyrrolo[1,2-a]pyrazine heterocyclic moieties were obtained by parallel solution-phase synthesis. Key steps include different reactions of initial alkyl 4H-thien…
The surface energies of α-rhombohedral, β-rhombohedral, and α-tetragonal boron were calculated from first principles, for the first time, to investigate their role in nanoscale crystal growth. The results support the existence of the pure α-tetragonal polymorph of boron. Although the existence of this polymorph had lo…
Porphyrins are stable molecules with a macrocyclic conjugated system and often peripheral substituents. This unique structure makes the electronic properties of the four meso-carbons (the methine bridges) nearly identical. Replacement of the weakly electron-polarizing 2,4-vinyl groups of protoporphyrin IX with strongl…
Pseudomonas putida CA-3 accumulates polyphosphate (polyP) and medium-chain-length polyhydroxyalkanoate (mclPHA) concurrently under nitrogen limitation. Five other mclPHA-accumulating Pseudomonas strains are capable of simultaneous polyP and mclPHA biosynthesis. It appears that polyP is not the rate-limiting step for m…