Materials Literature
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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…
Molecular dynamics (MD) simulations in combination with an atomistic path technique are used to examine energies required to impinge a screw dislocation on a coherent twin boundary (CTB) in Al and Cu. At large distances, we find that the dislocation-CTB interaction is characterized by repulsive forces which can be att…
The photocatalytic properties of the conjugated polymers have been investigated for the first time. Degradation of various textile dyes such as Alizarin S, Alizarin G, Orange G, and Remazol brilliant blue were studied under UV radiation. The experimental data indicated that the photocatalytic activity of the conjugate…
Poly(methyl methacrylate) (PMMA)−C 60 nanocomposites, with compositions in the range 0 ≤ φ C60 wt ≤ 0.05, are shown to exhibit systematic increases in dynamic shear moduli, in glass transition temperature ( T g ), and in the longest relaxation time of the polymer (τ R ) with increasing fullerene concentration. We show…
The nanoscroll-to-nanotube thermal transformation was studied for H 4 Nb 6 O 17 ·4.4H 2 O scrolls, prepared by exfoliation of K 4 Nb 6 O 17 . Thermal dehydration of the scrolls produces Nb 2 O 5 nanotubes at 400−450 °C. The nontopochemical transformation results in polycrystalline nanotubes; however, significant textu…
To understand why lotus leaf surfaces have a two-scale structure, we explore in this paper two stability mechanisms. One is the stability of the Cassie-Baxter wetting mode that generates the superhydrophobicity. A recent quantitative study (Zheng et al., Langmuir 2005, 21, 12207) showed that the larger the slenderness…
Uniform LnPO(4).x H(2)O (Ln=Y, La-Nd, Sm-Lu) nanocrystals that have controllable 0D (spherelike), 1D (rodlike), and 2D (polygonlike) structures have been systematically synthesized by means of a hydrothermal method by using a mixed solvent of water and ethanol. Transmission electron microscopy images and SEAD (selecte…
A generalised Wulf-Kaishew theorem is given describing the equilibrium shape (ES) of an isolated 3D crystal A deposited coherently onto a lattice mismatched planar substrate. For this purpose a free polyhedral crystal is formed then homogeneously strained to be accommodated onto the lattice mismatched substrate. Durin…
A cradle-to-grave environmental life cycle assessment (LCA) of a few poly(3-hydroxybutyrate) (PHB) based composites has been performed and was compared to commodity petrochemical polymers. The end products studied are a cathode ray tube (CRT) monitor housing (conventionally produced from high-impact polystyrene, HIPS)…
The activation of dioxygen and its analogues, such as hydrogen peroxide, by metalloporphyrins leads to the generation of high-valent metal-oxo species. This process is critically important to heme-catalyzed reactions, such as for cytochrome P450, and synthetic porphyrin-catalyzed oxidations. We have synthesized a new…
We present anelastic and dielectric spectroscopy measurements of PbZr(1-x)Ti(x)O(3) with 0.455 < or = x < or = 0.53, which provide new information on the low-temperature phase transitions. The tetragonal-to-monoclinic transformation is first order for x < 0.48 and causes a softening of the polycrystal Young's modulus…
In this paper we present an improved process for producing elastomer transistor stamps and high-mobility organic field-effect transistors (FETs) based on semiconducting acene molecular crystals. In particular, we have removed the need to use a silanized Si wafer for curing the stamps and to handle a fragile micron-thi…