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  • sol-gel  (17)
  • RFLP  (7)
  • Springer  (24)
  • American Association of Petroleum Geologists
  • Frontiers Media SA
  • Institute of Physics
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  • 2020-2024
  • 2015-2019
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  • 1995-1999  (24)
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  • Springer  (24)
  • American Association of Petroleum Geologists
  • Frontiers Media SA
  • Institute of Physics
  • Wiley
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  • 2020-2024
  • 2015-2019
  • 2010-2014
  • 1995-1999  (24)
  • 1975-1979
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  • 1
    Electronic Resource
    Electronic Resource
    Spectroscopic Study of Cerium-Doped Silica Gel Monoliths and Their Densified Derivatives (1997)
    Springer
    Journal of sol gel science and technology 9 (1997), S. 65-69 
    Details
    ISSN: 1573-4846
    Keywords: sol-gel ; cerium ; silica gel ; rehydration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Cerium is exploited as a probe cation for elucidating the structure of an alkoxide-derived silica gel and its progressive evolution to a glass network as a function of heat-treatment up to 1000°C. At intermediate temperatures, the host structure exhibits inhomogeneity due to insufficient formation of siloxane bonds, which is reflected by at least two different sites and co-ordination spheres (termed “high” and “low” water ligation) for cerium. This is proved by the response of the gels heated up to 700°C to rehydration. Further formation of Si-O-Si network (900°C) leads to the destruction of the “high water” sites of cerium and progression towards a glassy structure. It is, however, only after heat-treatment at 1000°C that a dense silica glass network, not responding to rehydration, is finally obtained with cerium ions embedded in it.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026412407553
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  • 2
    Electronic Resource
    Electronic Resource
    Spectroscopic study of cerium-doped silica gel monoliths and their densified derivatives (1997)
    Springer
    Journal of sol gel science and technology 9 (1997), S. 65-69 
    Details
    ISSN: 1573-4846
    Keywords: sol-gel ; cerium ; silica gel ; rehydration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Cerium is exploited as a probe cation for elucidating the structure of an alkoxide-derived silica gel and its progressive evolution to a glass network as a function of heat-treatment up to 1000°C. At intermediate temperatures, the host structure exhibits inhomogeneity due to insufficient formation of siloxane bonds, which is reflected by at least two different sites and co-ordination spheres (termed “high” and “low” water ligation) for cerium. This is proved by the response of the gels heated up to 700°C to rehydration. Further formation of Si−O−Si network (900°C) leads to the destruction of the “high water” sites of cerium and progression towards a glassy structure. It is, however, only after heat-treatment at 1000°C that a dense silica glass network, not responding to rehydration, is finally obtained with cerium ions embedded in it.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02439337
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  • 3
    Electronic Resource
    Electronic Resource
    QTLs associated with chlorimuron ethyl sensitivity in soybean: Effects on seed yield and related traits (1997)
    Springer
    Theoretical and applied genetics 94 (1997), S. 971-974 
    Details
    ISSN: 1432-2242
    Keywords: Key words Soybean ; Glycine max ; QTLs ; RFLP ; Chlorimuron ethyl ; Seed yield
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Soybean, Glycine max (L.) Merr., genotypes are known to differ in chlorimuron ethyl sensitivity (CS). Earlier we have reported two putatively independent marker loci linked to two quantitative trait loci (QTLs) controlling CS in a soybean population derived from a cross of PI97100 (sensitive to chlorimuron ethyl) and ‘Coker 237’ (tolerant to chlorimuron ethyl). The objective of the present study was to quantify the association of the two marker loci with seed yield and related traits in this soybean population following application of chlorimuron ethyl. Phenotypic data were collected for 111 F2-derived lines of the cross grown in replicated plots at Athens, G.A., in 1994 and 1995, and at Blackville, S.C., in 1995. The two CS marker loci explained as much as 50% of the genetic variation in seed yield and seed number m-2, but had no association with seed weight, plant height, lodging, seed protein, and seed oil. There were no epistatic interactions between the two marker loci for any of the traits. The marker locus (cr168-1 on USDA linkage group E) linked to the major CS QTL explained between 13 and 23% of the variation in seed yield. The Coker 237 allele at this locus was associated with decreased CS and increased seed yield. The marker locus (Blt015-2 on an unknown linkage group) linked to the minor CS QTL accounted for a maximum of 11% of the variation in seed yield. The Coker 237 allele at this locus was associated with an increase in CS and a decrease in seed yield. The association of the two marker loci with seed number m-2 strongly resembled their association with seed yield. Seed yield had a strong positive correlation (r=0.74 – 0.94) with seed number m-2, and the effect of chlorimuron ethyl on seed yield was due mainly to its effect on seed number m-2 rather than seed weight.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050503
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  • 4
    Electronic Resource
    Electronic Resource
    Nanocomposites Fe2O3/SiO2-Preparation by Sol-Gel Method and Physical Properties (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 615-618 
    Details
    ISSN: 1573-4846
    Keywords: sol-gel ; magnetic nanocomposite ; iron oxide ; Mössbauer spectroscopy ; Kerr effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Magnetic nanocomposites γ-Fe2O3/silica were prepared by a one-step sol-gel method. The sol was prepared by TEOS (tetraethyl orthosilicate) acid hydrolysis in the presence of an iron salt soluble in methanol. After gelation and drying, the transparent samples were characterized after treatment at different temperatures. The particle size, observed by HR TEM, was in the range of 2–10 nm and depended on Fe-concentration and heating temperature. Magnetic measurements showed either a ferromagnetic or a superparamagnetic behaviour and could be explained by the particle size. The dependence of the magnetic behaviour on the particle size was also studied by Mössbauer spectroscopy. The samples in which the Fe2O3 particle size was approximately 10 nm showed magnetic splitting (sextet) at room temperature, while smaller particles (2–3 nm) showed this splitting only at the temperature of liquid helium. The optomagnetic properties of the samples were also measured (Kerr effect).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018359923896
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  • 5
    Electronic Resource
    Electronic Resource
    Contributions to the Gelling Process in the Bi-Sr-Ca-Cu-O System, Via Acetate Route (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 681-684 
    Details
    ISSN: 1573-4846
    Keywords: sol-gel ; acetates ; Bi-based superconductors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Metal acetates represent suitable precursors in the sol-gel method. Generally, acetates are used in multicomponent systems with alkoxides or other carboxylic salts. However, Bi-Sr-Ca-Cu-O superconductors have been obtained by the sol-gel method starting only from acetate mixture. This work was intended to study the gelling process of acetates involved in the formation of bismuth-based superconducting phases, both individually and in the bi- and multicomponent systems. Probably, copper acetate is mainly responsible for the gel formation in these systems. The gelling process was monitored by measuring the pH, density and viscosity changes. The gels obtained were characterized by UV-VIS and IR spectra, DTA/TGA and powder X-ray diffraction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018388730256
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  • 6
    Electronic Resource
    Electronic Resource
    Photochromic Doped Sol-Gel Materials for Fiber-Optic Devices (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 931-935 
    Details
    ISSN: 1573-4846
    Keywords: photochromic ; fiber optic ; sol-gel
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Photochromic-doped sol-gel materials have been prepared by adding a spiropyran photochromic dye to a solution of ethoxy silane monomers containing non-reacting ethyl radicals. After polymerization, normal photochromism (i.e., colored material upon UV irradiation) is obtained in the resulting matrix. The sol-gel matrix hinders the organic molecule rotations, thus giving two stable states, which can be reversibly switched by UV and green-blue irradiation respectively. If these materials are attached to optical fibers, the properties of the light throughput may be modified. Simple fiber-optic/photochromic devices made of two optical fibers placed in a V-groove removable connector have been prepared. Once cured, these devices behave as optically addressed variable delay generators. The same devices can be used for preparing simple optical switches and routing systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018389014269
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  • 7
    Electronic Resource
    Electronic Resource
    Improved Composition for Sol-Gel Rare-Earth Doped Planar Waveguides (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 1013-1016 
    Details
    ISSN: 1573-4846
    Keywords: sol-gel ; neodymium and erbium doped planar waveguide ; fluorescence lifetime measurement ; phosphorous and aluminium codoping
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A multilayer sol-gel process has been developed in order to make highly doped rare-earth planar waveguides on silica or silicon substrates. Starting with a small range of constituents, such as SiO2, TiO2, P2O5 and Al2O3, we show that a large variety of gel compositions, with different spectroscopic behaviour, can be made when doped with rare-earths. We have doped the sol-gel films with neodymium and we have optimized their compositions by measuring the neodymium fluorescence lifetime. For a composition with 10 atom% of phosphorous, the lifetime evolution with neodymium concentration was studied and a quenching concentration was found at 1% of neodymium. We have also shown the strong influence of phosphorous or aluminium in the sol composition on the fluorescence lifetime, for a given neodymium concentration. First results on similar planar waveguides, doped with erbium, are also presented. The stability of the fluorescence lifetime over a long period of time is an other important point to be checked for these new materials: the lifetime evolution over a 9 months measurement period is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018374005608
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  • 8
    Electronic Resource
    Electronic Resource
    Color Displays with Gel-Glass Dispersed Liquid Crystals (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 1063-1066 
    Details
    ISSN: 1573-4846
    Keywords: GDLC ; color display ; liquid crystal ; sol-gel
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Liquid crystal microdroplets trapped into silica gel-glasses by sol-gel processes may be used for display applications. Gel-glass dispersed liquid crystals (GDLC) are switched between opaque and transparent states by applying external AC-voltage signals; no polarizers are required. The feasibility of applying these materials to colored displays has been explored. A comparative study of different dyes for GDLC color displays, which were either embedded in the sol-gel matrix or dissolved in the liquid crystal microdroplets is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018394611060
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  • 9
    Electronic Resource
    Electronic Resource
    Nanocomposites Fe2O3/SiO2-preparation by sol-gel method and physical properties (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 615-618 
    Details
    ISSN: 1573-4846
    Keywords: sol-gel ; magnetic nanocomposite ; iron oxide ; Mössbauer spectroscopy ; Kerr effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Magnetic nanocomposites γ-Fe2O3/silica were prepared by a one-step sol-gel method. The sol was prepared by TEOS (tetraethyl orthosilicate) acid hydrolysis in the presence of an iron salt soluble in methanol. After gelation and drying, the transparent samples were characterized after treatment at different temperatures. The particle size, observed by HR TEM, was in the range of 2–10 nm and depended on Fe-concentration and heating temperature. Magnetic measurements showed either a ferromagnetic or a superparamagnetic behaviour and could be explained by the particle size. The dependence of the magnetic behaviour on the particle size was also studied by Mössbauer spectroscopy. The samples in which the Fe2O3 particle size was approximately 10 nm showed magnetic splitting (sextet) at room temperature, while smaller particles (2–3 nm) showed this splitting only at the temperature of liquid helium. The optomagnetic properties of the samples were also measured (Kerr effect).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02436910
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  • 10
    Electronic Resource
    Electronic Resource
    Contributions to the gelling process in the Bi−Sr−Ca−Cu−O system, via acetate route (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 681-684 
    Details
    ISSN: 1573-4846
    Keywords: sol-gel ; acetates ; Bi-based superconductors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Metal acetates represent suitable precursors in the sol-gel method. Generally, acetates are used in multicomponent systems with alkoxides or other carboxylic salts. However, Bi−Sr−Ca−Cu−O superconductors have been obtained by the sol-gel method starting only from acetate mixture. This work was intended to study the gelling process of acetates involved in the formation of bismuth-based superconducting phases, both individually and in the bi-and multicomponent systems. Probably, copper acetate is mainly responsible for the gel formation in these systems. The gelling process was monitored by measuring the pH, density and viscosity changes. The gels obtained were characterized by UV-VIS and IR spectra, DTA/TGA and powder X-ray diffraction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02436922
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