Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Time-Resolved X-ray Diffraction Study of the Temperature Dependence of the Structure of Magnesium Stearate Multilayers (1995)
    s.l. : American Chemical Society
    Langmuir 11 (1995), S. 2348-2351 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00007a005
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Herringbone structure in two-dimensional single crystals of cyanine dyes. I. Detailed structure analysis using electron diffraction (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 818-825 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The crystalline structure of two-dimensional aggregates of different carbocyanine molecules was investigated in detail by means of electron diffraction. The aggregates are formed by electrostatic adsorption of anionic dye molecules from an aqueous solution at a positively charged ammonium lipid monolayer. From the diffraction pattern we deduce a herringbonelike arrangement of the dye molecules as described by a centered, rectangular unit cell containing two identical molecules. The aggregate structures of the systems investigated here differ only by the mutual orientation of the molecules and the axis ratios of the unit cell. For further optical studies we determine the angle α between the main axes of the differently oriented molecules with very high precision. We calculate electron diffraction intensities of several structures which are simulated on the computer and compare them to experimental data. We observe that the dye aggregates are aligned to one of the crystal axes of the lipid lattice. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470114
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Herringbone structure in two-dimensional single crystals of cyanine dyes. II. Optical properties (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 826-833 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Optical spectra of two-dimensional single crystals of cyanine dye molecules are studied experimentally and theoretically. Crystallites of three carbocyanine dye molecules, which are chemically different, but exhibit nearly identical optical properties, are prepared by adsorption from aqueous solution at a charged ammonium lipid monolayer. By means of electron diffraction it was found that the crystal structure of the aggregates consists of a rectangular unit cell containing two molecules of different orientation. Measurements of polarized absorption, reflectance, and fluorescence spectra of single crystallites reveal that this structure leads to Davydov splitting of the electronic transition into two exciton bands. The band structure of these exciton bands is calculated with the help of Kuhn's extended dipole model. It is demonstrated, how the exciton energy depends on the relative orientation of the two molecules within the unit cell. Calculated splitting energies are in reasonable good agreement with experimentally observed values. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470115
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Thermodynamic Relation of an Insoluble Monolayer at the Oil/Water Interface and at the Air/Water Interface in Contact with Oil (1995)
    s.l. : American Chemical Society
    Langmuir 11 (1995), S. 2881-2888 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00008a007
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Structure of octadecanol monolayers: An x-ray diffraction study (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 2006-2010 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Octadecanol monolayers at the air/water interface are studied by grazing incidence x-ray diffraction. At low lateral pressures one observes the diffraction patterns inherent to the next-nearest neighbor tilt of the molecules. The unit cells are found to be distorted at both low (6 °C) and high (33 °C) temperatures due to tilt of the molecules and ordering of their backbones. Unexpectedly, at an intermediate temperature of 22 °C, the unit cell remains hexagonal in the water plane, despite the tilt of the molecules. This behavior is treated in terms of hydrogen bonding with the water molecules and does not imply the existence of a separate phase. Our diffraction study also does not show any indication of a phase transition S*–L2* corresponding to the singularities in the isotherms within the tilted phase. The tilting phase transitions from untilted phases S and LSII seem to be continuous, since the transition pressures obtained by extrapolation of the tilt angle to zero tilt coincide with the ones determined by Brewster angle microscopy. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.476777
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Triple-chain phospholipid monolayers: a scanning force microscopy and grazing incidence X-ray diffraction study (1998)
    Springer
    Applied physics 66 (1998), S. 1245-1249 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 68.55; 68.55.Jk
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Surface viscoelasticity of phospholipid monolayers at the air/water interface (1996)
    Springer
    Colloid & polymer science 274 (1996), S. 1183-1187 
    Details
    ISSN: 1435-1536
    Keywords: Phospholipid ; Langmuir monolayers ; surface rheology surface dilational elasticity ; surface shear viscosity
    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 The surface viscoelastic properties of monolayers of two phospholipids DPPC (L-α-dipalmitoylphosphatidylcholine) and DMPE (L-α-dimyristoylphosphatidyl-ethanolamin), at the air-water interface have been investigated. Two techniques were used for the investigation. One involved use of an interfacial shear rheometer (torsion pendulum apparatus ISR1), to provide measurements of the shear viscosity ηs as a function of surface pressure, and the second, a modified LB trough with an oscillating barrier to generate periodie dilation and compression so as to measure the dilational elastic modulusE as a function of surface area. Results indicate a strong dependence of ηs andE upon monolayer phases. This suggests that the viscoelastic relaxation of monolayers can be understood as molecular rearrangements, domain exchange and molecular reorientations between different monolayer states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00655690
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Isotherms of phospholipid monolayers measured by a pendant drop technique (1996)
    Springer
    Colloid & polymer science 274 (1996), S. 995-999 
    Details
    ISSN: 1435-1536
    Keywords: ADSA ; phospholipids ; LB film balance ; monolayer isotherms ; BAM
    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 The Axisymmetric Drop Shape Analysis (ADSA) has been used to study the surface pressure/area isotherms of insoluble surfactant monolayers. The continuous measurement of surface tension as a function of surface area by increasing and decreasing the drop volume allows to investigate the phase transitions in monolayers. The isotherms of two phospholipids, dipalmitoyl phosphatidyl choline (DPPC) and dimyristoyl phosphatidyl ethanolamine (DMPE), show good agreement with those measured by using a conventional Langmuir-Blodgett film balance, except in the coexistence region. The observed disagreements are discussed in terms of differences in compression rate, curvature of the surface and effect of impurities. Evidence of possible geometric effects on monolayer domain formation and growth is given on the basis of BAM images. Due to the small total surface area, the ADSA technique provides advantages as regards homogeneity of temperature, surface pressure, surface concentration and the symmetry of area changes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00656630
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...