Materials Literature
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Abstract Mixed phthalocyaninato tetrakis(4‐pyridyl)porphyrinato rare earth triple‐decker complexes M 2 (TPyP) 2 (Pc) [M = La ( 1 ), Eu ( 2 )] have been prepared by condensation between M(TPyP)acac generated in situ and M(Pc) 2 . Their symmetrical structure (TPyP)M(Pc)M(TPyP) was verified by 1 H NMR (1D and 2D) spectra…
An atomic dipole interaction model has been used for calculating the second hyperpolarizability of carbon nanotubes on a length scale up to 75 nm. It is demonstrated that an atomistic representation of mesoscale systems such as nanotubes can be used to obtain a cubic response property up to a size of the system where…
TiN‐coated Si 3 N 4 particles were prepared by depositing TiO 2 on the Si 3 N 4 surfaces from Ti(O‐ i ‐C 3 H 7 ) 4 solution, the TiO 2 being formed by controlled hydrolysis, then subsequently nitrided with NH 3 gas. A homogeneous TiO 2 coating was achieved by heating a Si 3 N 4 suspension containing 1.0 vol% H 2 O wit…
Abstract MCM-48 is functionalized with mono-, di-, and triamino-silanes without destruction of the mesoporous structure in order to efficiently remove chromate and arsenate in aqueous solutions. The adsorption capacities achieved 160 and 182 mg/g-adsorbent for chromate and arsenate, respectively, when triamino-functio…
Abstract Reduced-charge samples were prepared from Li + - and Ni 2+ -saturated SAz-1 montmorillonite by heating at 150 and 300°C for 24 h. X-ray diffraction analysis showed interstratification of non-swelling and swelling interlayers in LiS150, while fully expandable interlayers were found in NiS150. Heating at 300°C…
Over the past 30 years the combination of chemical separation and molecular analysis has proven invaluable to the analytical chemist in identifying chemicals at extremely low concentrations in complex matrices. For example, a drug and its metabolites can be effectively separated from blood plasma using gas chromatogra…
Abstract The paper deals with interactions between low molecular weight substances and silica. Activity of SiO 2 towards ethylene‐propylene‐diene rubber (EPDM) also depends on the kind of crosslinking system used. Calcium carbonate, the filler exhibiting low interactions with elastomers does not show any changes in ac…
Automatic weld hardfacing is being employed increasingly in process and power industries. Plasma transferred arc welding (PTAW) has become a natural choice for automatic hardfacing due to its reliability, better process control, ease of use, low dilution and high volume production. Increasing the use of PTAW in its au…
Abstract In the chitons (Polyplacophora, Mollusca), the body is not entirely protected by the shell. Mineralized spicules or scales often, but not always, decorate the exposed part of the girdle. Here, we report a study on the composition and ultrastructural organization of these mineralized skeletal parts in four dif…
A complete classification for unbundling transitions of two semiflexible polymers and for desorption transitions of such polymers at planar surfaces is presented. The interaction potentials can depend both on the polymer/polymer (or polymer/surface) separation and on the orientation of the polymers. Using analytical t…
Surface-enhanced Raman spectroscopy (SERS) has proven to be a very powerful tool in the analysis of a wide range of compounds. However, continuous irradiation of the laser beam over the SERS substrate can promote the gross decomposition of the sample analytes and significantly broaden and diminish the intensities of o…
Abstract Phases observed in the BaO−Fe 2 O 3 −TiO 2 system are classified and described in terms of the framework of close‐packed {O,Ba/O} layers, with the transition metal atoms either in octahedral (titanium and iron) or in tetrahedral (iron only) sites. The resulting crystal chemistry features new combinations of s…
Summary The sorption behaviour of Ba 2+ in three different clay minerals from various regions of Turkey has been investigated by means of a tracer technique using 133 Ba in batch experiments. Sorption of Ba 2+ on montmorillonite, kaolinite and illite has been studied in mixed solutions of BaCl 2 and NaCl at ionic stre…
Abstract Cast films of a metallocene Linear Low Density Polyethylene (mLLDPE) have been cold‐drawn in the machine direction in two sequential steps to form ultra‐oriented films. The initial films were cast under low shear conditions to form essentially isotropic films, as shown by very low orientation birefringence. T…
Abstract Core–shell morphology formation within the dispersed phase was studied for composite droplet polymer‐blend systems comprising a high‐density polyethylene matrix, polystyrene shell and different molecular weights of poly(methyl methacrylate) core material. The blends were prepared in the melt using an internal…
Abstract The morphological distribution of injection‐moulded isotactic poly(propylene) (iPP) plates in the presence of nucleating agents was extensively investigated using synchrotron radiation. The commercial PP compound was injection‐moulded under a variety of different conditions in order to explore the effects of…
Insertion and folding of polytopic membrane proteins is an important unsolved biological problem. To study this issue, lactose permease, a membrane transport protein from Escherichia coli, is transcribed, translated, and inserted into inside-out membrane vesicles in vitro. The protein is in a native conformation as ju…
The preparation of methyl viologen−smectite (synthetic saponite, Sumecton SA; synthetic hectorite, Laponite XLG; and natural montmorillonite, Kunipia F) intercalation compounds and the photoinduced electron transfer from smectite to methyl viologen were investigated. UV−vis and electron spin resonance spectra revealed…
The crystal structure of the phosphorylating glyceraldehyde-3-phosphate dehydrogenase (GAPDH) from Bacillus stearothermophilus was solved in complex with its cofactor, NAD, and its physiological substrate, D-glyceraldehyde 3-phosphate (D-G3P). To isolate a stable ternary complex, the nucleophilic residue of the active…
Abstract The deformation and breakup of a single polycarbonate (PC) drop in a polyethylene (PE) matrix were studied at high temperatures under simple shear flow using a specially designed transparent Couette device. Two main breakup modes were observed: (a) erosion from the surface of the drop in the form of thin ribb…