Materials Literature
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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…
In this work, an attempt has been made to understand the feasibility of using a ultrahigh frequency (UHF) technique for identification of any corona discharge/ arcing in insulating material due to water droplets. The sensors of broadband type are useful for the identification of such discharges. It is realized that co…
Density functional theory (DFT) calculations were devised to get insight into Lewis acidic catalysis by POMs, especially on the intriguing activation of complexed water molecules that was observed in some experimental cases. Computationally, it appears that deprotonation is feasible with [alpha(1)-Hf(H(2)O)P(2)W(17)O(…
We study the local electronic properties of superconducting graphene in presence of impurities. In particular, we consider the case of magnetic and nonmagnetic impurities being either strongly localized or acting as a potential averaged over one unit cell. The spin dependent local density of states (LDOS) is calculate…
Abstract Isotactic and optically active poly( D ‐lactic acid) (PDLA) and phenyl‐substituted poly(lactic acid)s (Ph‐PLAs), i.e., poly( D ‐phenyllactic acid) (Ph‐PDLA) and poly( L ‐phenyllactic acid) (Ph‐PLLA), were synthesized and stereospecific interactions between the synthesized polymers were investigated by their t…
We show that the determination of ferroelectric properties by the measurement of polarization charge hysteresis curves can be misleading. Measurements using polyethylene oxide and simulations with a three-dimensional hopping model, developed for the characterization of the space charge polarization in solid electrolyt…
Abstract Four representative rubber matrices with varying molecular polarity, such as SBR, NBR, EPDM, and CNBR, were reinforced by mechanical blending with γ‐(methacryloxy)proxyltrimethoxy silane (KH570) silanized natural fibrillar silicate (FS)/unmodified FS when dicumyl peroxide was used as a curing agent. The effec…