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  • 1
    Electronic Resource
    Electronic Resource
    Thermally induced transformations at an ion implanted α–Fe2O3/α–Al2O3 interface: A Mössbauer spectroscopy study (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4141-4145 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thermally induced chemical transformations at the interface between a 100 nm α–Fe2O3 and a polycrystalline α–Al2O3 substrate are studied and compared for the cases of the as-formed and ion bombarded interfaces. The thermal annealings are carried out under vacuum at 450 °C for different time durations and the transformations are examined by conversion electron Mössbauer spectroscopy. It is shown that in the sample prebombarded with 110 keV Ar+ ions, the formation of Fe3−xAlxO4, FeAl2O4, and FeO phases is favored at variance with a nonbombarded sample in which primarily a defective Fe3O4-y phase is produced with some amount of FeO. This difference is explained in terms of the annealing process of the oxygen vacancies produced during Ar implantation near the interfacial region. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361779
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  • 2
    Electronic Resource
    Electronic Resource
    Deposition of metallic films by laser ablation of oxides in hydrogen atmosphere (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 6418-6421 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Pulsed laser ablation from oxide surfaces in hydrogen atmosphere is shown to be a powerful new method for deposition of high quality metal films. Specifically, the cases of ablation from CuO and α-Fe2O3 are studied. By examining the effects of hydrogen pressure, laser energy density, and the substrate temperature on the nature of the deposited films, optimum parameters have been identified for realization of high quality films of metallic Cu and Fe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355144
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  • 3
    Electronic Resource
    Electronic Resource
    Pulsed laser deposition of iron oxide and ferrite films (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5647-5649 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Iron oxide and ferrite films were prepared by pulsed ruby laser evaporation from the respective bulk materials on alumina substrates. The variation in the film properties as a function of the substrate temperature and oxygen partial pressure during deposition was studied. Conversion electron Mössbauser spectroscopic analysis showed that the stoichiometry and microstructure of such films depend on these deposition conditions, especially the oxygen partial pressure in the system. Typically it was observed that when laser deposition is performed by vaporizing α-Fe2O3 in the oxygen partial pressure of 10−4 Torr, Fe3O4 thin films were formed while deposition at a background pressure of 10−6 Torr led to formation of FeO films. Similar experiments were also performed on zinc ferrite and it was observed that the nanosecond pulsed evaporation process transports the stoichiometry of metal constituents from the bulk to the film with a small degree of zinc enrichment. In addition to Mössbauer spectroscopy, other techniques such as scanning electron microscopy and x-ray diffraction were also used to characterize the laser-deposited films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342258
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  • 4
    Electronic Resource
    Electronic Resource
    New routes for the synthesis of iron oxide based magnetic materials (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3792-3794 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: New routes using laser and ion beam techniques are developed to synthesize iron oxide based magnetic materials. The first method, pulsed ruby laser treatment (pulse duration 30 ns, λ=0.694 μm) of thermally grown iron oxide (α-Fe2O3) under water, is shown to lead to the formation of FeO and Fe3O4 phases depending upon the choice of the treatment parameters. The other method, ion beam mixing to atomically mix a deposited overlayer of cobalt (400 A(ring) thick) on an α-Fe2O3 substrate with 100-keV Ar+ at a dose higher than 1×1016 ions/cm2, leads to ferrite formation. The surface layer sensitive technique of conversion electron Mössbauer spectroscopy (CEMS) was employed for characterization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340616
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  • 5
    Electronic Resource
    Electronic Resource
    Deposition of iron oxide thin films by pulsed laser evaporation (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 1320-1322 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Iron oxide films have been deposited on alumina substrates by pulsed ruby laser evaporation from a bulk α-Fe2O3 pellet. The films have been characterized by using the techniques of conversion electron Mössbauer spectroscopy, Rutherford backscattering, and scanning electron microscopy. It is demonstrated that the stoichiometry of the deposited film can be varied between FeO and Fe3O4 by controlling the oxygen partial pressure during deposition over a range from 5×10−7 to 10−4 Torr. It is further shown that the Fe3O4 film can be converted into γ-Fe2O3 by suitable thermal annealing treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100427
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  • 6
    Electronic Resource
    Electronic Resource
    Film fermentor for ethanol production by yeast immobilized on cotton cloth (1984)
    Springer
    Biotechnology letters 6 (1984), S. 797-802 
    Details
    ISSN: 1573-6776
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Saccharomyces cerevisiae cells were immobilized on cotton cloth. The resulting yeast films were placed in parallel in a rectangular fermentor which was designed for scale-up. Ethanol production from sugars in the hydrolysate of Jerusalem artichoke tubers was studied in three modes of operation: batch, circulated batch and continuous flow. Circulated batch fermentation gave the shortest time of fermentation and accordingly the highest average ethanol productivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00134721
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  • 7
    Electronic Resource
    Electronic Resource
    Resistance of bacterial film to contamination during use as inoculum in repeated batch fermentation (1987)
    Springer
    Biotechnology letters 9 (1987), S. 43-46 
    Details
    ISSN: 1573-6776
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary AnEscherichia coli strain constitutive for β-galactosidase was immobilized onto cotton cloth. The resultingE.coli film was used as a resident inoculum in repeated batch fermentations for 30 days in the presence ofBrevibacterium ammoniagenes added as a contaminant. Analysis of β-galactosidase production shows that contamination did not decrease the capacity of the film to generateE.coli cells, or decrease theE.coli population on the film.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01043391
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  • 8
    Electronic Resource
    Electronic Resource
    Use of bacterial films as resident inocula for repeated batch fermentation (1985)
    Springer
    Biotechnology letters 7 (1985), S. 753-758 
    Details
    ISSN: 1573-6776
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Six bacteria of industrial importance were found to form immobilized populations on cotton cloth. The resulting bacterial films generated free cells at significant rates which remained constant for at least 60 days. By retaining these films in a fermentor, the films could be used as resident inocula in repeated batch fermentations. An equation for the rate of cell mass generation from the resident inocula was developed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01032291
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  • 9
    Electronic Resource
    Electronic Resource
    Cellulose acetate entrapment of Escherichia coli on cotton cloth for aspartate production (1986)
    Springer
    Biotechnology letters 8 (1986), S. 277-282 
    Details
    ISSN: 1573-6776
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Aspartase containingEscherichia coli cells were entrapped in cellulose acetate aggregated on cotton cloth. The enzyme activity of the cloth was stabilized by treatment with polyethylenimine and alkaline glutaraldehyde in the presence of 0.1 M sodium dithionite. A column packed with the cloth segments catalyzed 100% conversion of 1 M ammonium fumarate to aspartic acid at a space velocity of 7/h. When the same cloth segments were stirred at 100 rpm in the substrate solution, the productivity of the cloth increased 2.5 times.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01030512
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  • 10
    Electronic Resource
    Electronic Resource
    Stability of plasmid PBR322 in Escherichia coli immobilized on cotton cloth during use as resident inoculum (1987)
    Springer
    Biotechnology letters 9 (1987), S. 825-830 
    Details
    ISSN: 1573-6776
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary E. coli cells harbouring plasmid pBR322 which confers ampicillin resistance were immobilized on cotton cloth. The resulting film was used as an inoculum in daily repeated batch culture in ampicillin-free medium. During two months, the film was able to produce cultures which, at the late log phase, showed little sensitivity to 10 mg/ml ampicillin. Thus such a bacterial film can effectively be used as an inoculum for the production of recombinant DNA products by means of pBR322 or its derivatives in the absence of ampicillin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01026190
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