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  • 1990-1994  (7)
Datenquelle
Materialart
Erscheinungszeitraum
Jahr
Schlagwörter
  • 1
    Digitale Medien
    Digitale Medien
    Chemical resistance of the moulding of saponite/acriflavine complex after carbonization (1990)
    Springer
    Journal of materials science 25 (1990), S. 4847-4851 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Powders of saponite/acriflavine complex (SAC) saponite/carbon black mixture (SKM) and saponite itself (Sap) were pressed into small discs (20 mm diameter × 3 mm), followed by heat treatment at 1073 to 1473 K under nitrogen or argon. Their chemical resistance to 10% NaOH, conc. HCl, conc. HNO3 and conc. H2SO4 solutions at room temperature was examined on the basis of weight loss. The resistance of the three samples to NaOH solution was found to increase with increasing heat-treatment temperature, and both SAC and Sap after heating to 1473 K exhibited only a slight weight loss even after soaking for 20 d. On the whole, SAC had the highest resistance among three. The three samples were more resistant to acid solutions than NaOH, the resistance of both SKM and Sap increasing with increasing heat-treatment temperature. The amorphous component and forsterite crystal in the samples after heating to high temperature were preferentially attacked by NaOH and acid solutions, respectively. These results are discussed on the basis of X-ray diffraction, SEM observation, carbon content, etc.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01129951
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  • 2
    Digitale Medien
    Digitale Medien
    Affinity of carbon material to methanogenic bacteria (1990)
    Springer
    Journal of materials science 9 (1990), S. 693-695 
    Details
    ISSN: 1573-4811
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00721806
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Antibacterial activated carbon fibre derived from phenolic resin fibre by use of co-graftpolymerization (1993)
    Springer
    Journal of materials science 28 (1993), S. 4731-4734 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Phenolic-resin fibre was co-graftpolymerized with methyl methacrylate and methacrylic acid. The weight of the fibre increased by 26% after grafting. The grafted fibre was soaked in silvernitrate solution to introduce silver ion on methacrylic acid in the graft by an ion-exchange reaction, followed by carbonization at 900 °C for 30 min under a nitrogen stream and activation at 900 °C under a steam stream. After activation for 40 min, the resulting fibre showed a silver content of 8.3 wt% a specific surface area of 1300 m2g−1 and antimicrobial activity against Staphylococcus aureus and Escherichia coli. The average crystallite size of the silver in this fibre was 30 nm, which suggests co-graftpolymerization is a useful technique to disperse fine silver particles in the activated carbon fibre. After soaking in flowing tap water for 10 and 20 days, this activated carbon fibre lost about 50 wt% of silver but kept its antibacterial activity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00414265
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  • 4
    Digitale Medien
    Digitale Medien
    Carbonization and graphitization of poly-p-phenylene sulphide (PPS) film (1994)
    Springer
    Journal of materials science 29 (1994), S. 4477-4480 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Oriented poly-p-phenylene sulphide (PPS) films (thickness 12 and 75 μm) and PPS powder were carbonized/graphitized after stabilizing by oxidation, in order to examine the effect of sulphur on graphitizability of the resulting carbons. The films and the powder resulted in carbons with a high and a low graphitizability respectively. An “in-plane oriented structure” of the PPS film was the most predominant factor to lead to a high graphitizability, and sulphur in the precursor did not lower the graphitizability when it was subjected to solid-phase carbonization. These phenomena are discussed on the basis of analytical data.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00376269
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  • 5
    Digitale Medien
    Digitale Medien
    Antimicrobial and antifungal agents derived from clay minerals (1992)
    Springer
    Journal of materials science 27 (1992), S. 5027-5030 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Montmorillonite supported by Ag+-chelate of hypoxanthine was synthesized and heat-treated at 200
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01105269
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  • 6
    Digitale Medien
    Digitale Medien
    Antimicrobial and antifungal agents derived from clay minerals (1994)
    Springer
    Journal of materials science 29 (1994), S. 11-14 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Five antimicrobial ammonium cations were intercalated into two clay minerals (saponite and montmorillonite) by using ion-exchange reaction. About 90% of the cation exchange capacities of the clay minerals were replaced by ammonium ions with a few exceptions. The resultant complexes exhibited antimicrobial activity against both Staphylococcus aureus and Escherichia coli. After heating to 250 °C, the antimicrobial activity was kept for the complexes with aromatic ammonium ions but not for those with aliphatic ammonium ions. The complexes were treated with deionized water and a 3% aqueous solution of sulphuric acid to examine the elution of the ammonium ions. The elution finished within 1 day, with retention of 80% of the aromatic ammonium ions. Aliphatic ammonium ions remained in smaller amounts.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00356566
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  • 7
    Digitale Medien
    Digitale Medien
    Volatile glandular secretions of three species of new world army ants,Eciton burchelli, Labidus coecus, andLabidus praedator (1993)
    Springer
    Journal of chemical ecology 19 (1993), S. 2705-2719 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Hymenoptera ; Formicidae ; Ecitoninae ; army ants ; Eciton ; Labidus ; (E)-β-ocimene ; Dufour gland ; mandibular gland
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract The Dufour glands of workers ofEciton burchelli contain a mixture of small quantities of oxygenated compounds, some of which are derived from terpenes, and C17-C25 hydrocarbons. The secretion of the Dufour glands of soldiers was either similar to that of workers, with geranylacetone a significant component, or they contained geranyllinalool in large amounts. The glands of workers and soldiers ofLabidus praedator andLabidus coecus contained (E)-β-ocimene, a new substance for the Dufour glands of ants. 4-Methyl-3-heptanone was the dominant compound in the mandibular glands ofE. burchelli andL. coecus. Skatole and indole were found in the gasters ofL. praedator, and skatole was present in the venom glands of some soldiers ofE. burchelli.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00980702
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