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  • 1995-1999  (5)
  • Column liquid chromatography  (3)
  • Polymer and Materials Science  (2)
  • (Human)
  • 1
    Electronic Resource
    Electronic Resource
    Determination of the specific interaction of disubstituted aromatic compounds on hydrous zirconium oxide-loaded porous polymer resin (1996)
    Springer
    Chromatographia 42 (1996), S. 396-400 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Hydrous zirconium oxide ; Porous polymer resin ; Disubstituted phenols ; ortho-Benzoic acid derivatives
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A porous polymer resin loaded with hydrous zirconium oxide (Zr-gel) was evaluated as a stationary phase for the liquid chromatographic separation of disubstituted aromatic compounds. The prepared Zr-gel was used to separate disubstituted phenols andortho-substituted benzoic acid derivatives in reversed-phase mode. The retention time of catechol was greater than those of other disubstituted phenols; this implies that the Zr-gel has specificity for the phenolic hydroxyl group. The retention behavior ofortho-substituted benzoic acid derivatives on the Zr-gel was also evaluated in reversedphase mode using buffer. Phthalic acid was specifically retained in the vicinity of pH 6.0, which has been regarded as the equal adsorbic point. Similar behavior was also observed for salicylic acid, although the retention time of salicylic acid was less than that of phthalic acid. It seems that the specific retention behavior of hydrous zirconium oxide is a result of complexation with ligands such as hydroxyl and carboxyl groups. The results of this study have revealed that the retention mechanism of hydrous zirconium oxide is a combination of ion exchange and interaction based on complexation with ligands.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02272129
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Evaluation of the influence of the base material loaded with hydrous zirconium oxide gel on the retention behavior of disubstituted benzoic acids (1996)
    Springer
    Chromatographia 43 (1996), S. 79-81 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Hydrous zirconium oxide ; Porous polymer resin ; Silica gel ; ortho-Benzoic acid derivatives
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Silica gel loaded with hydrous zirconium oxide (Zr-gel-S) has been prepared and the influence of the base material on the retention behavior ofo-phthalic acid on the hydrous zirconium oxide was evaluated. The retention behavior of the acid on the Zr-gel-S was compared with that on Zr-gel-5, the polymer-based Zr-gel. Comparable retention behavior,i.e. maximum retention in the vicinity of pH 6, which has been regarded as the equal adsorbic point, was observed for both types of Zr-gel, although there was a large difference in the retention times. The difference in retention on the two types of Zr-gel could be ascribed to nature of the base material. The results in this experiments showed, however, that the specific behavior at pH 6 was an essential characteristic of hydrous zirconium oxide and was not related to the influence of the base materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02272826
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Elution behaviour of anions and cations on a mixed-bed stationary phase of anion and cation exchange resins (1995)
    Springer
    Chromatographia 40 (1995), S. 539-544 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Mixed-bed stationary phase ; Anion and cation exchange resins ; Retention mechanism of anions and cations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The retention mechanism of anions and cations on a mixed-bed column packed with a mixture of strong anion and cation exchange resins has been studied. Organic acids and inorganic anions have showed the same elution behaviour on the mixed-bed column as on a single anion exchange column. In contrast, different elution behaviours for cations have been observed between the mixed-bed column and a single cation exchange column. On the mixed-bed column, cations would be eluted by a mixed retention mechanism. The primary retention mechanism is ion exchange with eluent cation (H+) for all cations. The ion exchange mechanism on the sites occupied by anion exchange groups makes a greater contribution for monovalent cations. A partition mechanism between the stationary phase and mobile phase contributes to the separation of Mg2+ and Ca2+ by forming neutral compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02290265
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    XPS and SERS Studies of Cell Adhesion-controlled Polymer Modified by Ion Implantation (1996)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 24 (1996), S. 252-256 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: X-ray photoelectron spectroscopy (XPS) of Ne ion-bombarded polymer has been carried out in order to examine the cause of HeLa cell adhesion control on polymers. Substrates used were polystyrene (PS) and oxygen plasma-treated polystyrene (PS-O). Neon bombardments into the patterned region of PS and PS-O were performed at an energy of 150 keV with fluences of 1×1014 and 1×1015 ions cm-2. The surface chemical bonding states were investigated by XPS. In HeLa cell adhesion measurements, the Ne-bombarded region of PS with a fluence of 1×1015 ions cm-2 exhibits higher adhesion and spreading of HeLa cells than the unbombarded region. On the contrary, it is found that the Ne-bombarded region of PS-O inhibits HeLa cell adhesion. The XPS results show that Ne bombardment to PS or PS-O destroys the original chemical bonds and consequently produces new functional groups. It is considered that the drastic change of surface chemical bonding states from the pristine states induced by Ne bombardment leads to a clear distinction between increasing and inhibiting HeLa cell adhesion.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 5
    Electronic Resource
    Electronic Resource
    Angle-dependent XPS Analysis of (NH4)2Sx-treated InP(001) Surfaces (1996)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 24 (1996), S. 578-582 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Angle-dependent high-resolution XPS spectra of S 2p, In 3d5/2 and P 2p have been measured on the InP(001) sample etched chemically, treated with (NH4)2Sx at room temperature (RT), exposed to air at RT and annealed at 400°C in a vacuum. Three kinds (S-I, S-II and S-III) of chemical states of sulphur on the (NH4)2Sx-treated InP(001) surface at RT are found. It is suggested that S-I, S-II and S-III correspond to sulphur in the bulk, sulphur bridge-bonded to indium on the surface and elemental sulphur, respectively. Chemical state of S-III is decreased for the treated sample exposed to air at RT for 1 month. It is removed upon annealing the sample at 400°C in a vacuum, while S-I and S-II remain on the surface. The thickness of the sulphide layer on the annealed surface is estimated to be about one monolayer. Angle-dependent XPS spectra of S 2p and In 3d5/2 are discussed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
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