ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

1

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Solid state extrusion of thermoplastic elastomers 4 (1984)

Bandara, U. ; Dröscher, M. ; Thomas, E. L.

Springer

Colloid & polymer science 262 (1984), S. 538-550

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ISSN: 1435-1536

Keywords: solid state extrusion ; block copoly(ether ester) ; structure ; small angle X-ray scattering ; mechanical properties

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Abstract A solid state extrusion technique is applied as to produce oriented block copoly(ether ester) under various physical conditions. The morphology of the extruded samples is characterized in relation to the extrusion parameters and hard segment compositions of the polymer, using thermal analysis and X-ray methods. The lateral dimensions of the crystalline domains are found to be approximately 150 Å depending on the extrusion conditions. The statistics of the long range periodicity of the structure along the extrusion direction is in agreement with a one-dimensional two phase model, the crystalline portion of which does not vary much in thickness (35 – 45 Å). The unexpected increase in the long period and the thermal shrinkage suggest the existence of strained interlamellar amorphous chains (tie molecules). The observed variations in tensile properties are interpreted under the assumption that both the number of such tie molecules and their fully extended lengths are determined by the hard segment composition and the extrusion conditions. It is also argued that the increase in the glass transition temperature is not only a function of the composition of hard segments in the amorphous phase but also of the number of strained tie molecules.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01451517

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2

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Influence of structural parameters on the properties of electrolytic Ni–Mn–S deposits (1999)

Atanassov, N. ; Schils, H. W.

Springer

Journal of applied electrochemistry 29 (1999), S. 51-57

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ISSN: 1572-8838

Keywords: codeposition Ni ; Mn ; S ; X-ray analysis ; structure ; texture ; properties

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology

Notes: Abstract Microstructural parameters such as coherent domain size, microstrain, dislocation density and texture of electrolytically plated Ni–Mn–S layers were investigated by X-ray analysis. Structural parameters, layer composition and the macroproperties are discussed and explained. With the help of a statistical regression analysis the correlation coefficient r2 and its relationship with the investigated parameters is determined. It is shown that the microstructural parameters play an important role in determining the macroscopic properties. The manganese concentration is shown to influence the structural parameters, but no influence of sulphur is found. It seems that a relationship of the structural parameters with the macroscopic properties is valid in general and is not a special case. There structural correlations can be used in general for processing electrolytic deposits for required applications.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1003486714232

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3

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The formation of a Schiff base intermediate: a nickel(II) complex of an asymmetric tripodal ligand (1999)

He, Ling ; Gou, Shaohua ; Shi, Qingfang ; [et al.]

Springer

Journal of chemical crystallography 29 (1999), S. 207-210

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ISSN: 1572-8854

Keywords: Tripodal ligand ; Ni(II) complex ; quinoline ; carbinoxyamine ; structure

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences , Physics

Notes: Abstract Treatment of Ni(ClO4)2 · 6H2O with the condensing product of 2-formylpyridine N-oxide and 1,5-diamino-3-(8-methylquinolyl)azapentane (dmqa) has resulted in the formation of an asymmetric tripodal nickel(II) complex, [C28H32N6O3Ni](ClO4)2 · H2O, which has been crystallographically characterized. Crystal data: triclinic, space group p ī, a = 10.384(2), b = 10.911(3), c = 16.6101(11) Å, α = 95.62(2), β = 105.04(2), γ = 112.954(11)°, D c = 1.581 g/cm3, Z = 2 and V = 1631.0(6) Å3. A quinoline moiety is first introduced into an arm in the complex of a tripodal ligand in which an ethylcarbinoxyamine group, the intermediate of Schiff bases, exists.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1009578329008

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4

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Crystal structure and conformational analysis of N-formyl and N-nitroso derivatives of piperidinone (1999)

Kumaran, D. ; Ponnuswamy, M.N. ; Shanmugam, G. ; [et al.]

Springer

Journal of chemical crystallography 29 (1999), S. 769-775

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ISSN: 1572-8854

Keywords: structure ; conformation ; equatorial ; axial orientations

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences , Physics

Notes: Abstract Single crystal X-ray studies for N-formyl-2,6-diortho chlorophenyl-3,5-dimethyl piperidin-4-one (FOCDMPO) and N-nitroso-2,6-di(3′,4′,5′-trimethoxyphenyl)-3,5-dimethyl piperidin-4-one (NTMPO) are reported. Crystals of FOCDMPO and NTMPO belong to the monoclinic space groups P21/n and C2/c, respectively. FOCDMPO: a = 9.147(2), b = 14.586(3), c = 13.665(5) Å and β = 101.68(2)° NTMPO: a = 38.52(2), b = 13.727(5), c = 9.564(3) Å and β = 98.60(1)°. In both the structures, the piperidine ring adopts a boat conformation with slight distortion. In FOCDMPO, one of the phenyl and methyl groups are in axial positions while the other phenyl and methyl groups are in equatorial orientations. In NTMPO, the situation is reversed. The molecules are stabilized by weak intermolecular C—H ··· O interactions in addition to van der Waals forces.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1009587518299

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5

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Crystal structure refinement of nitroguanidine (1999)

Bracuti, A.J.

Springer

Journal of chemical crystallography 29 (1999), S. 671-676

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ISSN: 1572-8854

Keywords: nitroguanidine ; energetic molecule ; structure ; oxidizer

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences , Physics

Notes: Abstract The crystal and molecular structure of nitroguanidine was refined using X-ray single-crystal diffraction methods. Previous structure determinations achieved with single crystal photographic or neutron powder techniques yielded values for the C—N ‘formal’ double bond-length that either equaled or exceeded the ‘formal’ C—N single-bond lengths. Bond lengths were more precisely and accurately determined here than in the previous studies, but the ‘formal’ double-bond length still exceeds the ‘formal’ single bond lengths. Comparisons of crystal bond lengths with ab initio derived bond lengths of an isolated nitroguanidine molecule and hydrogen-bonded clusters of nitroguanidine molecules suggest that observed bond-length abnormalities are caused by intermolecular forces in the crystal. The crystal is orthorhombic, with a = 17.6390(5), b = 24.8730(7), c = 3.5903(1) Å, V = 1575.19 Å3, Z = 16, and D calc = 1.736 g cm−3.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1009519703355

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6

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Structure and thermal stability of zinc–nickel electrodeposits (1999)

Bories, C. ; Bonino, J-P. ; Rousset, A.

Springer

Journal of applied electrochemistry 29 (1999), S. 1045-1051

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ISSN: 1572-8838

Keywords: electrodeposition ; structure ; thermal stability ; zinc–nickel

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology

Notes: Abstract ZnNi alloys were electrodeposited from a chloride bath on steel substrates. The effect of nickel bath concentration on chemical composition, structure and microstructure of the deposits is demonstrated. From 0 to 13 nickel, the phases obtained do not correspond to that reported on the thermodynamic phase diagram. It is shown that the substitution of zinc by nickel is responsible for the formation of distorted ηd and γd phases corresponding to the supersaturated hexagonal η phase of zinc and to the unsaturated cubic γ phase of Zn–Ni alloy, respectively. Differential scanning calorimetry indicates that the thermal instability of the alloys containing up to 13 wt of nickel, results from the crystallization of the δ phase from the ηd and γd phases at around 200 °C and 250 °C, respectively.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1003574625112

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7

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Crystal structure and spectroscopic study of bis{1,3-bis[3-(5-amino-1,2,4-triazolyl)]triazenido-N′4,N2,N″4}nickel(II) tetrahydrate (1999)

Hanot, V.P. ; Robert, T.D. ; Haasnoot, J.G. ; [et al.]

Springer

Journal of chemical crystallography 29 (1999), S. 299-308

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ISSN: 1572-8854

Keywords: Triazole ; triazene ; Ni(II) ; structure ; spectroscopy

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences , Physics

Notes: Abstract The title compound [Ni(batt)2]·4H2O, in which Hbatt is 1,3-bis[3-(5-amino-1,2,4-triazolyl)]triazene, has been prepared and its crystal structure determined by X-ray diffraction methods. The compound crystallizes in the tetragonal space group I4/m (a = 10.5645(8) Å, c = 9.1336(6) Å, and Z = 2). The Ni(batt)2 molecule has local 4¯ symmetry, but it is located on a crystallographic 4/m site and is disordered over the mirror plane. The ligand batt− is tridentate with nitro-type coordination of the triazenido group and N4 coordination of the two outer triazolyl substituents. The complex has a distorted octahedral geometry with meridional configuration of the two nearly planar batt− ligands. The geometry of the tridentate cavity is examined and a comparison is made with the Ni-terpyridyl system, which shows similar coordination around the nickel center. The FTIR, micro-Raman, and UV-vis spectra are analyzed in relation with the structure.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1009521817873

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8

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Crystal structure of triethylentetraammonium bis monohydrogen-monophosphate dihydrate β-NH3(CH2)2NH2(CH2)2NH2(CH2)2NH3(HPO4)2·2H2O (1999)

Elaoud, Z. ; Kamoun, S. ; Mhiri, T.

Springer

Journal of chemical crystallography 29 (1999), S. 1287-1290

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ISSN: 1572-8854

Keywords: organic phosphate ; structure

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences , Physics

Notes: Abstract The salt triethylentetraammonium bis monohydrogen-monophosphate dihydrate is orthorhombic Pbca with unit cell dimensions a = 8.963(2), b = 10.326(2), c = 17.381(4)Å; Z = 4; Dm = 1.540 g cm−3; D x = 1.562 g cm−3. The examination of the structure shows a layer arrangement parallel to the $${\bar c}$$ axis: planes of [HPO4]2− tetrahedra alternate with planes of [(NH3(CH2)2NH2CH2)2]4+. The [HPO4]2− tetrahedra are connected through O(W)s--H···O hydrogen bonds, so that infinite chains of the composition [HPO4(H2O)]n 2n− are formed in the structure parallel to the $${\bar b}$$ axis. The structure of this compound is built from [HPO4]2− anions, [(NH3(CH2)2NH2CH2)2]4+ cations and zeolitic water molecules connected by hydrogen bonds.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1009513225242

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9

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Crystal structure of triethylentetraammonium bis monohydrogenmonophosphate dihydrate, [NH3(CH2)2NH2(CH2)2NH2(CH2)2NH3](HPO4)2 · 2H2O (1999)

Elaoud, Zakaria ; Kamoun, Slaheddine ; Mhiri, Tahar ; [et al.]

Springer

Journal of chemical crystallography 29 (1999), S. 541-545

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ISSN: 1572-8854

Keywords: organic phosphate ; structure

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences , Physics

Notes: Abstract The salt triethylentetraammonium bis monohydrogenmonophosphate dihydrate is monoclinic with the following unit cell dimensions: a = 8.462(1), b = 10.500(1), c = 9.520 Å, β = 99.297(1)°, space group P21/n with Z = 2. The structure was solved by the Patterson method and refined to final R value of 0.043 for 1590 independent reflections. The structure consists of infinite parallel two-dimensional [ $$\bar 1$$ 01] planes built of mutually connected ions and water molecules by strong O—H· · ·O and N—H· · ·O hydrogen bonding.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1009588517216

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10

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Kinetics and mechanism of the preparation of Raney® copper (1999)

Smith, A.J. ; Tran, T. ; Wainwright, M.S.

Springer

Journal of applied electrochemistry 29 (1999), S. 1085-1094

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ISSN: 1572-8838

Keywords: dealloying ; focussed ion beam ; selective dissolution ; skeletal catalysts ; structure

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology

Notes: Abstract Raney® copper is an active hydrogenation catalyst formed by the selective dissolution of aluminium from a Cu–Al alloy. The structure of Raney® copper is presented in a series of images taken using a focussed ion beam miller (FIB). The images show a structure consisting of a uniform three-dimensional network of fine copper ligaments. A rotating disc electrode, used to control the diffusion layer, enabled a study of the kinetics of the leaching reaction at 269–303 K in 2–8 m NaOH. Under these conditions, the reaction rate was constant and independent of hydroxide concentration. The activation energy for leaching was determined as 69±7 kJ mol−1. The mixed corrosion potential of the dissolving alloy has been related to the exposed copper surface area, which in turn is dependent on the leaching rate and the mechanism of rearrangement. The overall mechanism of formation/rearrangement of the Raney® copper structure was found to be mainly dissolution/redeposition of copper atoms, with surface or volume diffusion, or possibly both, playing a minor role.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1003637410133

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