Materials Literature
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A simple technique for the fabrication of optically active porous silicon (PSi) in the dark on n-type substrates is presented. This solves the long-standing problem that n-type photoluminsecnt porous silicon can only form under illumination. Strong visible red photoluminescence is demonstrated.
Polymerization of L -lactide within the pores of anorganic mammalian bone is described. No additional solvent or catalyst is used. The resulting composites exhibit macroscopic morphologies and mechanical properties similar to that of the original bone. We observe an average compressive strength of 194 MPa and an elast…
Hybrid scaffolds for tissue engineering are becoming increasingly complex through incorporation of biologically active biomacromolecules. There is a need to develop a compatible sterilization method that is capable of killing microorganisms, without adversely affecting the labile scaffold biomaterials or biomacromolec…
Molecular interactions between templating porogen particles and the underlying substrate can be exploited to create a controlled release mechanism while maintaining the bulk properties of the matrix material. Furthermore, these interactions can be reversed by priming the substrate with a hydrophobic layer to produce a…
Abstract A topological approach to the analysis of isomeric dendrimers by considering their molecular graphs has been applied to correlate various properties of a series of new sulfonimide‐based isomeric dendrimers with their structures. According to this approach isomeric dendrimers are referred to as either isograph…
Abstract In the previous paper (Zahedi et al., 1 J Appl Polym Sci, to appear) the optimal conditions of a new modeling procedure for correlating a scalar response to an input spectrum were established. In this article the developed model is applied to correlate the stress–strain behavior of several commercial high den…
Abstract Single crystals of barium oxalate monohydrate (BaC 2 O 4 .H 2 O, BOM) were grown in pure form by controlled diffusion of Ba 2+ using the gel technique at different temperatures. Starting from aqueous Ba 2+ chloride (BaCl 2 ) and acetic acid (C 2 H 2 O 4 ) in gel, this method offers a low‐cost and an easiest a…
Abstract High impact polystyrene (HIPS)/magnesium hydroxide (MH) composites were prepared by melt‐blending. Two kinds of interfacial modifiers were used in this research, maleinated poly[styrene‐ b ‐(ethylene‐ co ‐butylene)‐ b ‐styrene] (SEBS‐ g ‐MA) triblock copolymer and PS. The effects of the use levels of SEBS‐ g…
The ionization of noble gas atoms with keV energies scattered under grazing angles of incidence of about $2\ifmmode^\circ\else\textdegree\fi{}$ from atomically clean and flat metal surfaces is assigned to a two-electron Auger ionization process. Auger ionization, the inverse process of Auger neutralization, is a dynam…
Roll's auf! Die Selbstorganisation von para-Terphenylen-1,4′′-ylenbis(dodecanamid) in THF liefert je nach den Reaktionsbedingungen entweder mehrwandige aufgerollte organische Nanoröhren mit offenen Enden oder planare Schichtsysteme (siehe Bild). Die Nanoröhren können Fullerenmoleküle einschließen, was zu kabelartigen…
Polyvinyl alcohol hydrosulfate (PVA-S) was obtained by esterification reaction of polyvinyl alcohol using sulfuric acid. Nanoscale graphite (NanoG) resulting from exfoliation of expandable graphite and subsequent sonication irradiation of resulting expanded graphite shows nanoscale structure with a thickness of 40—70…
Abstract Composite sheets of polyethylene and polypyrrole‐coated wollastonite were prepared by extrusion and compression molding. Four compatibilizers were also evaluated, poly(ethylene‐ co ‐methyl acrylate) (EMA), maleated polyethylene (MAPE), poly(ethylene‐ co ‐vinyl alcohol) (EVOH), and poly(vinyl alcohol) (PVOH).…
The aim of this work is to understand the molecular evolution of iron-sulfur clusters in terms of electronic structure and function. Metal-substituted models of biological [Fe(4)S(4)] clusters in oxidation states [M(x)Fe(4-x)S(4)](3+/2+/1+) have been studied by density functional theory (M = Cr, Mn, Fe, Co, Ni, Cu, Zn…
Abstract The ferrimagnetic system CoCu(opba) [opba = ortho ‐phenylenebis(oxamato)] was employed to prepare a traditional chain [CoCu(opba)] · 4H 2 O ( 1 ) and a nanocomposite by incorporation in porous Vycor glass (PVG). This nanocomposite was made by first anchoring [Bu 4 N] 2 [Cu(opba)] on PVG [PVG‐Cu ( 2 )] and the…
Abstract Two block copolymers consisting of biodegradable segments of poly(ethylene glycol) (PEG) and poly(ε‐caprolactone) (PCL) with slight different lengths of soft hydrophilic segments (PEG) and molecular weight were produced. The copolymer with shorter PEG segments and higher molecular weight was named copolymer A…
Abstract Plasma‐polymerized thin films of vinyltriethoxysilane were deposited on IR‐transparent silicon wafers using plasma‐enhanced chemical vapor deposition at a wide range of RF pulsed power (0.05–25 W). The deposited films were analyzed by various spectroscopic techniques (RBS, ERDA, XPS, and FTIR) in order to com…
Abstract Chitosan‐modified PLA (CMPLA) was fabricated to improve cytocompatibility of polylactide (PLA). PMAA‐grafted PLA (PMAA‐PLA) was obtained through α‐methacrylic acid (MAA) grafted polymerization on PLA surface with photooxidization and UV irradiation. Steady PMAA‐PLA microparticle suspension with an average siz…
We used molecular dynamics and the empirical potential for carbon LCBOPII to simulate the nucleation/growth process of carbon clusters both in vacuum and under pressure. In vacuum, our results show that the growth process is homogeneous and yields mainly sp(2) structures such as fullerenes. We used an argon gas and Le…
Abstract The synthesis and structural characterization of the neutral gadolinium tetrakis‐type complex with 5,7‐dichloro‐8‐quinolinolato (H5,7ClQ) ligands, [Gd(5,7ClQ) 2 (H5,7ClQ) 2 Cl], is reported. The Gd III ion is epta coordinated to one chloride ion and to four ligands: two N,O‐chelated monoanions and two as zwit…
Tuning with pressure: Splitting of the Soret band in the novel amphiphilic porphyrin (OD)3TPPS3 is reversibly tuned by applying surface pressure (see figure). The degenerated transition of the Soret band is broken as a result of the formation of an ordered monolayer, which causes individual coupling of the components…