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  • 1
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 6369-6374 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Recently, it has been pointed out that the structure of shear ordered colloidal dispersions can adequately be accounted for by the intensity distribution I(l) along Bragg rods [Phys. Rev. Lett. 75, 763 (1995)]. Information concerning packing of the shear induced layers and on their stacking order is contained in I(l). In this paper I(l) is determined by measuring the small angle neutron scattering distribution as a function of the sample orientation. For the investigated charge stabilized system with particle diameter σ=143 nm and a distance of nearest neighbors in the layers a=237 nm, a structure close to random close-packed hexagonal layers is found. As compared with close-packed systems the distance between the layers c is elongated so that c≈a. Further, it is shown that the application of shear leads to a more uniform distribution of I(l) along the rods, which demonstrates that the loss of correlation between the hexagonal layers under sheared conditions can also be determined by small angle neutron scattering. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Langmuir 10 (1994), S. 3043-3045 
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Macromolecules 28 (1995), S. 1681-1687 
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 5 (1966), S. 336-340 
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung LiH wird mit Slaterfunktionen für die 1s-Elektronen von Li und SMO's für die beiden Valenzelektronen behandelt. Einige Eigenschaften des zweidimensionalen Spinraums werden diskutiert. Elektronenenergien und Dipolmomente werden berechnet.
    Abstract: Résumé Nous avons traité le problème à quatre électrons de LiH en utilisant des orbitales de Slater pour les électrons 1s de Li et des orbitales moléculaires distinctes pour les deux électrons de valence. Certaines propriétés de l'espace de spin à 2 dimensions existant dans le cas de quatre fonctions d'espace différentes sont discutées. On a calculé les énergies électroniques totales et les moments dipolaires.
    Notes: Abstract The four-electron problem in LiH has been treated by use of Slater type orbitals for the 1s electrons on the Li atom and split molecular orbitals for the two valence electrons. Some properties of the two dimensional spin space present in the case of four different space-functions are discussed. Total electronic energies and electric dipole moments have been calculated.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 5 (1966), S. 406-412 
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Mit der PPP-Methode in der Erweiterung von Ohno wurden π → π* und n → π* Anregungsenergien, Ionisationspotentiale einsamer Paare und Dipolmomente von einigen Azinen berechnet. Es zeigt sich, daß es mit der genannten Methode nicht möglich ist, Ionisationspotentiale und Anregungsenergien mit einem einzigen Parametersatz zu erfassen. Die Gründe dafür werden angegeben.
    Abstract: Résumé Nous avons utilisé la théorie semi-empirique de Pariser, Parr et Pople, dans la version de Ohno, pour calculer les énergies des transitions π → π* et n → π*, les potentiels d'ionisation des paires libres et les moments dipolaires de quelques azines. Les résultats indiquent l'impossibilité de tenir compte à la fois avec un seul jeu de paramètres des excitations et des ionisations de paires libres. Les raisons de cet échec de la méthode sont discutées.
    Notes: Abstract The semiempirical MO-LCAO-SCF theory by Pariser, Parr and Pople in an extension proposed by Ohno is used to calculate π → π* and n → π* transition energies, lone pair ionization potentials and electric dipole moments for some azines. The results indicate that with the method used it is impossible to take account of both excitations and ionizations from lone pairs with a single set of parameters. The reasons for this failure of the method are discussed.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 7 (1967), S. 150-155 
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Mit der PPP-Methode wurden dieπ-Elektronenergien voncis- undtrans-Stilben und dem Benzylradikal berechnet. Spezielle Aufmerksamkeit wurde auf den Unterschied der beiden Isomere bezüglich der Gesamtenergie und der sterischen Hinderung gerichtet.
    Abstract: Résumé Les énergies des électronsπ ducis et dutrans-stilbène ainsi que du radical benzyle ont été calculées à l'aide de la méthode semi-empirique de Pariser, Parr et Pople. On étudie particulièrement les différences des énergies totales entre les deux isomères et l'empêchement stérique de la forme cis.
    Notes: Abstract π-electron energies ofcis- andtrans-stilbene and the benzyl radical have been calculated by use of the semiempirical method proposed byPariser, Parr andPople. Special attention is devoted to differences in total energies between the two isomers and to the steric hindrance in thecis-form.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 7 (1967), S. 352-355 
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 192 (1991), S. 3021-3034 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Telechelic α,ω-macrozwitterions  -  narrowly distributed polystyrene chains oppositely charged at each end  -  were synthesized via anionic polymerization using direct functionalization with the initiator and the termination agent. The resulting products were purified (zwitterion content ≥ 0,95) and characterized with gel permeation chromatography, viscometry, static and dynamic light scattering and small-angle neutron scattering. In unpolar solvents as toluene, the polymeric zwitterions form clusters with molecular weights depending on concentration. In the dilute case, the clusters are relatively small and consist of approximately 8 zwitterions. The structure of these clusters is discussed by their scattering behaviour. Above a critical concentration being in the range of 0,05 g/cm3, an infinite aggregate is formed. Zwitterions in N,N-dimethylformamide behave differently: due to the attenuation of dipolar forces, no clusters are formed. In this case, the behaviour in dilute solution can be described by the formation of polymeric rings consisting of one polymer molecule, only.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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