Materials Literature
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High Resolution Image Download MS PowerPoint Slide Photoinduced charge-transfer dynamics between CdSe quantum dots (QDs) possessing varying monolayers of ZnS and hole scavengers such as phenothiazine (PT) and N -methylphenothiazine (NMPT) were investigated for optimizing the shell thickness of core−shell quantum dots.…
By modifying a well-studied peptide sequence, we have designed two biosurfactants with the ability to reversibly and precisely control the stability of foams. Foam stabilization occurs when the peptide forms a cohesive interfacial film cross-linked by metal ions, while foam destabilization occurs when peptide−metal bi…
Abstract The ring‐opening polymerization of ε‐caprolactone (ε‐CL) and δ‐valerolactone (δ‐VL) using nine catalytic systems consisting of a combination of three C 2v zirconocene complexes and three borate cocatalysts is discussed. The polymerizations proceed in a well‐controlled manner, producing polymers with relativel…
In polymer films carrying an excess of fixed charge the electrostatic penalty to bring ions of same charge from the bathing electrolyte into the film sets a membrane potential (Donnan Potential) across the film-electrolyte interface. This potential is responsible for the ionic permselectivity observed in polyelectroly…
Heteroporphyrin and -phthalocyanine arrays represent an attractive class of light harvesters and charge-separation systems exhibiting an easy route of synthesis and high chemical stability. In the present work, we report the results of photophysical investigations of two novel non-sandwich-type porphyrin-phthalocyanin…
The synthesis of two new water-soluble, carboxylate-substituted poly( p -phenyleneethynylene)s (PPE) is reported. These PPEs differ in their concentration of free carboxylate groups per repeat (two aryleneethynylenes) unit. The photophysical properties of these two polymers are compared to each other and to that of th…
Size exclusion chromatography (SEC) is shown to be an effective method to characterize single-wall carbon nanotube (SWNT) dispersions. SEC separates nanotube dispersions by size, and an on-line viscosity detector gives intrinsic viscosity as a function of hydrodynamic size, as is determined by universal calibration. T…
The electronic and optical properties have been calculated for monoclinic ${\mathrm{La}}_{2}\mathrm{Ca}{\mathrm{B}}_{10}{\mathrm{O}}_{19}$ (LCB) crystal using the state-of-the-art full potential linear augmented plane wave method. We present results for the band structure, density of states, birefringence, imaginary a…
A novel "anisotropic aggregation" model is proposed to simulate nucleation and growth of polymer single crystals as functions of temperature and polymer concentration in dilute solutions. Prefolded chains in a dilute solution are assumed to aggregate at a seed nucleus with an anisotropic interaction by a reversible ad…
The liquid crystalline properties and optical anisotropy of poly(diphenylacetylene) bearing an n -octadecylsilane moiety in the side chain, poly(1-phenyl-2- p -{dimethyl- n -octadecylsilylphenyl}acetylene) (C18-PDPA), were investigated in detail. C18-PDPA exhibited unexpected smectic phase liquid crystallinity in high…
We have used computer modeling techniques to investigate the interaction of Cu, Ag, and Au atoms (at 0.25 ML coverage) with the (111) surface of zirconia, ZrO 2 . The surface was simulated by means of periodic slabs, and the calculations were performed using spin-polarized density functional theory (DFT) within the ge…
The aim of this work was to explore how various surface treatments would change the dispersion component of surface energy and acid-base character of hemp nanofibers, using inverse gas chromatography (IGC), and to investigate the effect of the incorporation of these modified nanofibers into a biopolymer matrix on the…
Fluorene-based poly(ether−ether−ketone) (F-PEEK) was designed and synthesized by reacting a 9,9-diarylfluorene-containing biphenol and a naphthalene-containing dihaloarene. High molecular weight F-PEEK ( M w > 270 000; M n ∼ 55 000) was obtained in quantitative yields by the two-step polycondensation of 9,9-bis(4-hydr…
This article describes the synthesis of barium ferrite nanoparticles at low crystallization temperatures using a sodium citrate-aided process. Monodispersed barium ferrite amorphous nanoparticles were synthesized by the formation of metal−citrate complexes at pH 10, followed by hydrolysis at 100 °C. The mean particle…
On the phase of it: The phase selection of calcium carbonate (spheres: C gray, Ca green, O red) is determined by chiral amino acids (stick models) present during the crystallization. The interplay of composition and chirality of the crystal surfaces and additives leads to enantiospecific adsorption of the D and L amin…
To rationally design and explore a potential energy source based on the highly exothermic oxidation of boron, density functional theory (DFT) was used to characterize small boron clusters with 0-3 oxygen atoms and a total of up to ten atoms. The structures, vibrational frequencies, and stabilities were calculated for…
The equation of state of cubic boron nitride (cBN) has been determined to a maximum temperature of $3300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ at a simultaneous static pressure of up to more than $70\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$. Ab initio calculations to $80\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ and $200…
The one-pot synthesis of a new anionic polyelectrolytic macroinitiator based on esterification of a poly(glycerol monomethacrylate) precursor is described. Electrostatic adsorption of this macroinitiator onto an aminated (cationic) planar substrate is monitored by dual polarization interferometry. Controlled surface-i…
The paper presents a new synthesis route for the formation of spherical-shaped CdTe semiconductor nanocrystal quantum dots (NQDs) using colloidal solutions with oleic acid and trioctylphosphine stabilizers. The synthesis includes the occurrence of in situ precipitation of crystalline Cd 0 nanoparticles prior to the fo…
Poly(glycerol sebacate) (PGS) is a biodegradable and biocompatible elastomer specifically developed for soft tissue engineering. Vascular cells adhered to an elastomer may exhibit more physiological behavior because the substrate's mechanical properties more closely match those of the tissue. To investigate the feasib…