Materials Literature
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The synthesis and self-assembly of DOPA containing diblock copolypeptides into spherical vesicles is described. DOPA residues are naturally abundant in mussel adhesive proteins and are responsible for extensive covalent crosslinking of these materials upon oxidation. We found that vesicles could be formed from copolyp…
Density functional theory (DFT) calculations were carried out in a study of oxidation of methane to methanol by N 2 O on the Fe- and Co-ZSM-5 clusters. The catalytic cycle steps have been studied on model clusters ((SiH 3 ) 4 AlO 4 M) (where M = Fe, Co). Calculations indicate very low methanol selectivity without wate…
We report a single-step synthesis of a polyisobutene with a bis-urea moiety in the middle of the chain. In low polarity solvents, this polymer self-assembles by hydrogen bonding to form a comb-shaped polymer with a central hydrogen bonded backbone and polyisobutene arms. The comb backbone can be reversibly broken, and…
Collagen is a popular biomaterial. To deal with its lack of thermal stability and its weak resistance to proteolytic degradation, collagen-based materials are stabilized via different cross-linking procedures. Regarding the potential toxicity of residual cross-linking agents, enzyme-mediated cross-linking would provid…
The relative transparency of Daphnia magna (daphnia) and the unique optical properties of quantum dots (QDs) were paired to study the accumulation potential and surface coating effects on uptake of amphiphilic polymer coated CdSe/ZnS QDs. Fluorescence confocal laser scanning microscopy was used to visualize and spectr…
Abstract A novel preceramic polymer, polyzirconoxanesal (PZS), was synthesized efficiently by one‐pot protocol. The PZS polymer was characterized by the techniques of Fourier transform infrared spectra (FTIR), nuclear magnetic resonance ( 1 H‐NMR and 13 C‐NMR) and gel permeation chromatography (GPC). The precursor exh…
Previous literature by Falini et al. suggests that the cooperation between β-chitin, proteins, and a silk fibroin-like hydrogel determines polymorph selectivity within the nacreous layer of mollusk shells (favoring aragonite over calcite formation). Here we present an in vitro assay in which we combine functionalized…
The symmetry-broken geometry and variation of metal composition of semishells induce new plasmonic properties. A system of separated metallic semishells embedded in a poly(dimethylsiloxane) polymer film provides an ideal platform to investigate the localized surface plasmon resonance modes of semishells. We demonstrat…
A novel N,N,N′,N′ -tetraphenyl-1,4-phenylenediamine (TPPA)-containing aromatic dibromide ( 3 ), N, N -bis(4-bromophenyl)- N′, N′ -bis(4-(2,4,4-trimethylpentan-2-yl)phenyl)-1,4-phenylenediamine, was successfully synthesized. The novel conjugated polymer ( 4 ) having number-average molecular weight of 2.05 × 10 4 was pr…
Abstract A new melt electrospinning system equipped with a line‐like laser beam melting device developed for the mass production of nanofibers is introduced; this system enables fibers to be produced from locally melted polymer sheets in the presence of an electric field. Using this system, fibers were produced from p…
Multiphoton excited luminescent properties of water-soluble Eu(III) and Tb(III) complexes with derivatives of dipicolinic acid functionalized with a polyoxyethylene pendant arm and terminal groups, [Eu(L(OMe))(3)](3-), [Eu(L(NH2))(3)](3-), and [Tb(L(OH))(3)](3-), as well as of binuclear helicates with overall composit…
Indium(III) sulfide has recently attracted much attention due to its potential in optical sensors as a photoconducting material and in photovoltaic applications as a wide band gap material. On the other hand, optical absorption properties are key parameters in developing photosensitive photodetectors and efficient sol…
Silver nanoparticles (Ag NPs) covered with a double-shell consisting of a spacer layer and cyanine dye J-aggregate (JA) layer were synthesized to examine the hybrid effects of the molecular exciton and the surface plasmon on the spectroscopic properties. The absorption spectral features of the composite NPs are classi…
The kinetics of topochemical and morphological conversion of platelet-shaped Na 3.5 Bi 2.5 Nb 5 O 18, PbBi 4 Ti 4 O 15, and BaBi 4 Ti 4 O 15 Aurivillius phases to NaNbO 3, PbTiO 3, and BaTiO 3 perovskites were studied. Reaction of the ⟨001⟩ oriented Aurivillius phases with excess Na 2 CO 3, Pb 3 (CO 3 ) 2 (OH) 2, and…
Effective imaging of a cancer molecular biomarker is critical for accurate cancer diagnosis and prognosis. CLT1 peptide was observed to specifically bind to the fibrin-fibronectin complexes presented in tumor extracellular matrix. In this study, we synthesized and evaluated CLT1 peptide-targeted nanoglobular Gd-DOTA m…
Monodisperse microspheres of reconstituted silkworm cocoon silk were produced using a glass capillary-based microfluidic system and by identifying an appropriate solvent/nonsolvent fluid system. The microspheres can be produced to a range of different diameters depending on the system flow rates and have a nearly homo…
We explored direct photopatterning of a vapor polymerizable and photo-cross-linkable 3,4-ethylenedioxythiopene (EDOT) to make it suitable for use in electronics applications. We prepared a conductive polymer, PEDOT-MA, using vapor phase polymerization (VPP) of the (2,3-dihydrothieno[3,4- b ][1,4]dioxin-2-yl)methyl met…
The preparation, characterization, and magnetic properties of dispersible Co- and Ni-doped ZnO nanocrystals (NC) are reported. The nanocrystals, Zn 1− x TM x O where x = 0−0.07 for TM = Co and x = 0.02, 0.03 for TM = Ni have been synthesized by nonhydrolytic alcoholysis esterification elimination reaction using anhydr…
Nanosized zeolite L crystals containing about 550 strongly luminescent acceptor molecules have been modified by grafting a conjugated oligomer on their external surface. The 25 nm sized crystals have consequently been embedded in polymeric nanofibers obtained by electrospinning. The fluorescent molecule grafted on the…
We compute the dynamical polarizability of graphene beyond the usual Dirac cone approximation, integrating over the full Brillouin zone. We find deviations at $\ensuremath{\hbar}\ensuremath{\omega}=2t$ (where $t$ is the hopping parameter) which amount to a logarithmic singularity due to the Van Hove singularity and de…