Materials Literature
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Pt and Rh nanoparticles obtained by epitaxial growth on NaCl (001) were coated with a crystalline ceria support and subjected to systematic hydrogen reduction in the temperature range 573 K ≤ T ≤ 973 K. The structural and morphological changes were examined by high resolution electron microscopy and selected area elec…
The FTIR spectra of 4-aminoquinaldine and 5-aminoquinoline were recorded in solid phase on a Bruker IFS 66V spectrometer in the region 4000--400 cm-1. The FT-Raman spectra of these compounds were also recorded in the same instrument with a FRA 106 Raman module. The molecules under investigation are considered to have…
Five novel Gd(iii) complexes based on the structure of the heptadentate macrocyclic 1,4,7,10-tetraazacyclododecane-1,4,7-triacetic acid (DO3A) ligand have been synthesized and their (1)H and (17)O NMR relaxometric properties investigated in detail. The complexes have been functionalised on the secondary nitrogen atom…
Abstract The effect of shot noise and emission noise due to materials that have different emission properties was simulated. Local variations in emission properties affect the overall signal‐to‐noise ratio (SNR) value of the scanning electron microscope image. In the case in which emission noise is assumed to be absen…
Microorganisms, implicated in microbiologically influenced corrosion, were isolated from the deep subsurface at Yucca Mountain. Corrosion rates of iron-oxidizing, sulfate-reducing, and exopolysaccharide (EPS)-producing bacteria were examined in constructed electrochemical corrosion cells for periods up to 109 days. Th…
Abstract The changes of corrosion potential (E corr ) of metals immersed in seawater were investigated with electrochemical technology and epifluoresence microscopy. In natural seawater, changes of E corr were determined by the surface corrosion state of the metal. E corr of passive metals exposed to natural seawater…
We demonstrate the formation of gold nanocrystals of different morphologies using alkylated tyrosine (AT) as a reducing agent at a liquid–liquid and air–water interface. The reduction of aqueous chloroaurate ions occurs in a single step wherein the AT molecule plays the multifunctional role of a phase transfer, reduci…
Yttrium aluminium garnet (YAG) powders were synthesized by a citrate–nitrate gel combustion process. Thermogravimetry (TG), differential thermal analysis (DTA), X-ray powder diffraction (XRD), and time-resolved X-ray powder diffraction experiments were used to study the phase evolution. Formation of the pure YAG phase…
Sapphyrins fused with mono-bicyclo[2.2.2]octadiene (BCOD) and di-BCOD units are prepared, which are converted into mono-and dibenzosappyrins by heating at 200 ˚C; soret bands are red shifted by 10-20 nm by introduction of fused benzene rings, but Q bands are not much affected in benzosapphyrins."04 Het-Abstract") Sapp…
A sulfur redox cycle between La(2)O(2)SO(4)(S(6+)) and La(2)O(2)S(S(2-)) phases was found for the first time to achieve the oxygen storage of 2 mol O(2) mol(-1), which is eight times larger than that of the conventional CeO(2)-ZrO(2) system.
Abstract A series of 1,3,5‐tricyano‐2,4,6‐tris(styryl)benzene derivatives ( 1 , 2 ) and dendrimers ( 3 ) have been synthesized and their first hyperpolarizabilities (β) were determined. Whereas the λ max values of 1–3 are similar, the oscillator strength increases with the molecular size. For all compounds, the Stokes…
In order for the hydrogen based society viz. a society in which hydrogen is the primary energy carrier to become realizable an efficient way of storing hydrogen is required. For this purpose metal hydrides are serious candidates. Metal hydrides are formed by chemical reaction between hydrogen and metal and for the sta…
The structure of bundles of double-walled carbon nanotubes synthesized by catalytic chemical vapour deposition is investigated using transmission electron microscopy and electron diffraction. Small and well-crystallized bundles are observed and characterized by transmission electron microscopy and electron diffraction…
Six new complex salts trans-[Ru(II)Cl(pdma)2L][PF6]n [pdma = 1,2-phenylenebis(dimethylarsine); L = (E,E,E)-1,6-bis(4-pyridyl)hexa-1,3,5-triene (bph), n= 1, 5; L =N-methyl-4-[(E)-2-(4-pyridyl)ethenyl]pyridinium (Mebpe+), n= 2, 7; L =N-methyl-4-[(E,E)-4-(4-pyridyl)buta-1,3-dienyl]pyridinium (Mebpb+), n= 2, 8; L =N-methy…
The thermochromic properties of a series of liquid crystalline polymethacrylates, containing azobenzene side-chains with variable spacer lengths, were investigated. Annealing the amorphous polymer thin films above the glass transition temperature results in a rearrangement of the azobenzene moieties, causing a hypsoch…
A water-soluble polyaramide "sulfo-invert-PPTA" surprisingly, already at a molecular weight of 10,000 g mol(-1), exhibits a nematic liquid crystalline phase in water at very low polymer concentrations, around 1-2wt%, indicating that supramolecular assemblies of molecules are the building blocks of the nematic phase.
A series of intimately intermingled mixed metal oxide nanoparticles were prepared via a modified aerogel procedure (MAP). These mixed oxides were composed of alkaline earth oxides and aluminas. It was found that the surface area and reactivity of these materials decreased on going from magnesium to barium in these int…
A fabric bending model that includes contributions from nonlinear elasticity, and viscous and Coulomb friction with hysteretic effects is presented. The model allows the recovery of the loading, unloading and hysteresis behaviors observed in the Kawabata evaluation system (KES) bending tests and provides the ability t…
4,4[prime or minute]-Methylenebis(N-salicylidene-2,6-dialkylaniline) derivatives were prepared and their structures were determined by (1)H NMR, IR, DSC and X-ray crystallographic analyses. The 2,6-diisopropylaniline derivative yielded definite polymorphic crystals: the space groups of the crystals were C2/c and P2(1)…
Ti−Hf alloys are expected to have lower modulus and higher strength than pure Ti since. Hf has been suggested to have the potential to enhance the strength and to reduce the Young's modulus of Ti alloys at the same time. In the present study, binary Ti−Hf alloys with Hf contents from 5 to 40 mass% were designed and fa…