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  • SPACE SCIENCES  (4)
  • phase separation  (3)
  • Van Deemter equation  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Double Pore Silica Gel Monolith Applied to Liquid Chromatography (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 547-552 
    Details
    ISSN: 1573-4846
    Keywords: silicon alkoxide ; phase separation ; double pore structure ; liquid chromatography ; Van Deemter equation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Silica gels retaining double pore structure in the size ranges of micrometer and nanometer have been applied to the rod-shaped monolithic column for liquid chromatography. The macropore structure was designed by controlling the phase separation process induced by the hydrolysis and polycondensation of alkoxysilane, whereas the mesopore structure was tailored by the solvent exchange treatments on wet gels. The size exclusion chromatograms on polystyrene standards exhibited almost similar features for octadecyl-modified rod and conventional packed beads columns. The dependence of plate height on the velocity of mobile phase determined for amylbenzene was by far weaker in the rod column than in the packed beads column, suggesting that additional geometrical factors should be considered in describing the separation mechanism in the rod column.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018331101606
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Double pore silica gel monolith applied to liquid chromatography (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 547-552 
    Details
    ISSN: 1573-4846
    Keywords: silicon alkoxide ; phase separation ; double pore structure ; liquid chromatography ; Van Deemter equation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Silica gels retaining double pore structure in the size ranges of micrometer and nanometer have been applied to the rod-shaped monolithic column for liquid chromatography. The macropore structure was designed by controlling the phase separation process induced by the hydrolysis and polycondensation of alkoxysilane, whereas the mesopore structure was tailored by the solvent exchange treatments on wet gels. The size exclusion chromatograms on polystyrene standards exhibited almost similar features for octadecyl-modified rod and conventional packed beads columns. The dependence of plate height on the velocity of mobile phase determined for amylbenzene was by far weaker in the rod column than in the packed beads column, suggesting that additional geometrical factors should be considered in describing the separation mechanism in the rod column.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02436897
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Structure Design of Double-Pore Silica and Its Application to HPLC (1998)
    Springer
    Journal of sol gel science and technology 13 (1998), S. 163-169 
    Details
    ISSN: 1573-4846
    Keywords: silica gels ; phase separation ; pore size distribution ; liquid chromatography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Utilizing the concurrence of polymerization-induced phase separation and sol-gel transition in the hydrolytic polycondensation of alkoxysilanes, a well-defined macroporous structure is formed in a monolithic wet gel. By exchanging the fluid phase of the wet gel with an appropriate external solution, the nanometer-range structure of the wet gel can be reorganized into structures with larger median pore size essentially without affecting the macroporous framework. The double-pore structure thus prepared is characterized by open pores distributed in discrete size ranges of micrometers and nanometers. A new type of chromatographic column (silica rod) has been developed using monolithic double-pore silica instead of packed spherical gel particles. Typical silica rod columns had significantly reduced pressure drops and improved analytical efficiencies which do not deteriorate even at higher sample flow rates, both arising from a greater macropore volume than particle packed columns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008644514849
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    Paper (German National Licenses)
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  • 4
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    Elastic properties of tektites measured by resonant sphere technique. (1967)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Elastic properties of tektites measured using resonant sphere technique
    Keywords: SPACE SCIENCES
    Type: JOURNAL OF GEOPHYSICAL RESEARCH
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Elastic properties of a micro-breccia, igneous rock and lunar fines from Apollo 11 mission (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Micro-breccia, igneous rocks and lunar fines elastic properties at ambient conditions and as function of pressure, discussing near surface mare region models
    Keywords: SPACE SCIENCES
    Type: APOLLO 11 LUNAR SCIENCE CONFERENCE; Jan 05, 1970 - Jan 08, 1970; HOUSTON, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Rock physics properties of some lunar samples (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Linear strains and acoustic velocity data for lunar samples under uniaxial and hydrostatic loading are presented. Elastic properties are presented for 60335,20; 15555,68; 15498,23; and 12063,97. Internal friction data are summarized for a number of artificial lunar glasses with compositions similar to lunar rocks 12009, 12012, 14305, 15021, and 15555. Zero porosity model-rock moduli are calculated for a number of lunar model-rocks, with mineralogies similar to Apollo 12, 14, and 16 rocks. Model-rock calculations indicate that rock types in the troctolitic composition range may provide reasonable modeling of the lunar upper mantle. Model calculations involving pore crack effects are compatible with a strong dependence of rock moduli on pore strain, and therefore of rock velocities on nonhydrostatic loading. The high velocity of rocks under uniaxial loading appears to be compatible with, and may aid in, interpretation of near-surface velocity profiles observed in the active seismic experiment.
    Keywords: SPACE SCIENCES
    Type: Lunar Science Conference; Mar 05, 1973 - Mar 08, 1973; Houston, TX
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    NASA TECHNICAL REPORTS
  • 7
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    Applications to lunar geophysical models of the velocity-density properties of lunar rocks, glasses, and artificial lunar glasses. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: SPACE SCIENCES
    Type: Lunar Science Conference; Jan 10, 1972 - Jan 13, 1972; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
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