Materials Literature
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A magnetic nanoparticle conjugate was developed that can potentially serve both as a contrast enhancement agent in magnetic resonance imaging and as a drug carrier in controlled drug delivery, targeted at cancer diagnostics and therapeutics. The conjugate is made of iron oxide nanoparticles covalently bound with metho…
The multiplet structure of core-electron binding energies in Cr 3s, Cr 3p and Cr 2p levels of CrCl3 and CrBr3 compounds has been investigated by X-ray photoelectron spectroscopy. The Cr 3s levels show a doublet splitting (about 4.3 eV) for the main emission in both halides. Satellites features are observed in Cr 3s, 3…
The formation of homodimer complexes for interface stability, catalysis and regulation is intriguing. The mechanisms of homodimer complexations are even more interesting. Some homodimers form without intermediates (two-state (2S)) and others through the formation of stable intermediates (three-state (3S)). Here, we an…
Abstract Summary: Highly phosphonated double hydrophilic block copolymers (DHBCs) were synthesized through chain transfer radical polymerization or polymerization from a macro‐initiator. The DHBCs can be purified by a reprecipitation technique, in which any of the side products or precursors without phosphonate groups…
Abstract The design and testing of a control system for reverse‐flow catalytic afterburners based on a two‐variable bifurcation map is focused on. The combustion of lean methane–air mixtures is considered as the test reaction and a bench‐scale apparatus, with a special temperature‐control system based on dynamic compe…
Na 3 Al H 6 can be directly formed by mechanical milling NaH∕Al with TiF3 under hydrogen atmosphere. The hydrogenation fraction of NaH increases with increasing the milling time, and reaches up to 0.61 after 20h milling. Thus-formed Na3AlH6 exhibits unexpected polymorphic transformation and decomposition behaviors. Th…
We present a systematic experimental and theoretical study of the first-order phase transition of epitaxially grown MnAs thin films under biaxial tensile stress. Our results give direct information on the dependence of the phase-transition temperature of MnAs films on the lattice parameters. We demonstrate that an inc…
Abstract Summary: Liquid crystalline oligomers of 9,9‐bis(2‐ethylhexyl)fluorene of defined degree of polymerization 4, 5, 6, and 7 were investigated by X‐ray diffraction in the non‐oriented and in the aligned state. The diffraction data give evidence for a smectic B type phase for all of the oligomers. Quenching below…
Abstract Summary: Particles of poly( D , L ‐lactic acid) (PLA) obtained by emulsification‐diffusion were surface‐modified by adsorption of chitosan. Thus, positively charged biodegradable carriers were obtained as potential carriers for DNA. Various physico‐chemical parameters, susceptible to impact the elaboration of…
In this paper, we report a study on the thermal shock resistance (TSR) of MoSi 2 /SiCO ceramic composites obtained through controlled pyrolysis of a gel‐derived precursor. MoSi 2 ‐filled gel is prepared by casting a sol obtained from MoSi 2 powder dispersed in methyltriethoxysilane. The pyrolysis product can be descri…
The shape-memory effect is well documented in uranium–niobium alloys near the α″–γo metastable phase boundary. In situ neutron diffraction measurements during uniaxial loading indicate that U–14 at.% Nb (in the α″ monoclinic phase field) deforms by stress-induced twin reorientation. Alternatively, U–16 at.% Nb (initia…
A new series of unsymmetric Newkome-type dendrimers have been prepared and characterized. These dendrimers contain a single ureidopyrimidine residue covalently attached to their apical positions. In low polarity solvents, the first and second generation dendrimers form highly stable dimers via hydrogen bonding of thei…
The realization of the unit of absorbed dose at LNE-LNHB is based on calorimetry with the present GR8 graphite calorimeter. For this reason the calorimetric technique must be maintained, developed and improved in the laboratory. The usual quasi-adiabatic operating mode at LNHB is based on the thermal feedback between…
Crystal structures and magnetic properties were determined for two novel compounds, [1-(4'-iodobenzyl)pyridinium][M(mnt)2] (mnt2- = maleonitriledithiolate; M = Ni (1) or Cu (2)). At room temperature, single crystals of 1 and 2 were isostructural, featuring the formation of segregated columnar structures with regular s…
Ornithine aminotransferase and 4-aminobutyrate aminotransferase are related pyridoxal phosphate-dependent enzymes having different substrate specificities. The atomic structures of these enzymes have shown (i) that active site differences are limited to the steric positions occupied by two tyrosine residues in ornithi…
As-grown thin epitaxial ${\mathrm{Fe}}_{3}\mathrm{Si}$ films fabricated by molecular beam epitaxy on GaAs(001) are studied by grazing incidence x-ray diffraction. The long-range order parameters of the films of different stoichiometry are determined by measuring fundamental and superlattice crystal truncation rods and…
A novel, facile nonaqueous synthesis route to nanocrystalline lead zirconate titanate (PZT) powders is presented. Simple mixing of lead acetylacetonate with titanium and/or zirconium alkoxides in 2-butanone, followed by a solvothermal treatment at 200 °C, produced amorphous, nanosized precursor powders. According to X…
The electron field emission properties of individual multiwalled carbon nanotubes have been examined using a combined STM-TEM microscope. The measured electron emission, for low emission currents, can be fitted with a standard Fowler-Nordheim model. For higher electron emission, above $10\phantom{\rule{0.3em}{0ex}}\en…
Der Schweratomeffekt kann den Unterschied in den nichtlinearen optischen Eigenschaften dritter Ordnung der Cluster [Ag10(dcapp)4](OH)2⋅12 H2O (1, siehe Struktur), [Zn4O(dcapp)3]⋅6 H2O (2) und [Hg2(dcapp)2] (3) nicht erklären (H2dcapp=2,6-Dicarboxamido-2-pyridylpyridin). Quantenchemischen Rechnungen zufolge werden die…
We have constructed and operated a nanoscale linear motor powered by a single metal nanocrystal ram sandwiched between mechanical lever arms. Low-level electrical voltages applied to the carbon nanotube lever arms cause the nanocrystal to grow or shrink in a controlled manner. The length of the ram is adjustable from…