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  • 1
    Electronic Resource
    Electronic Resource
    Shape selectivity assessment of stationary phases in gas chromatography (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Microcolumn Separations 6 (1994), S. 115-125 
    Details
    ISSN: 1040-7685
    Keywords: gas chromatography ; stationary phases ; liquid crystal polysiloxane ; C18 polysiloxane ; shape selectivity ; polycyclic aromatic hydrocarbons ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Column selectivity is examined for a series of smectic liquid crystalline columns and is compared with methyl and C18 polysiloxane columns for the separation of polycyclic aromatic hydrocarbon (PAH) isomers. A set of extended and condensed solute probes is described that provides a sensitive indication of variations in column shape selectivity. Examples of shape selectivity differences are presented for smectic liquid crystalline columns and 5% phenyl polysiloxane columns using various PAH isomer sets. Variations in selectivity have been observed among different smectic liquid crystalline columns, and this problem appears more significant than for methyl polysiloxane columns. The selectivity ration for tetraphenylmethane and p-terphenyl provides a sensitive indication of column shape selectivity, with a change in elution order occurring between ordered (smectic liquid crystalline) columns and non-ordered (methyl polysiloxane) columns. Shape selectivity differences indicated by this test mixture are apparent for more complex PAH isomer mixtures. Despite stationary phase selectivity variability, smectic liquid crystalline columns offer considerable potential for solving difficult separation problems involving structured solutes.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mcs.1220060205
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  • 2
    Electronic Resource
    Electronic Resource
    Analysis of the squalestatins by on-line packed capillary liquid chromatography combined with electrospray mass spectrometry (1993)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 7 (1993), S. 953-956 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A mixture of four squalestatins was separated anil characterized by gradient packed capillary liquid chromatography combined with electrospray collision-induced dissociation mass spectrometry (ESI/CID/MS). Negative-ion ESI was found to afford spectra typified by strong pseudo-molecular ions but providing little structural information. Structural information was obtained using an ion-focusing RF-only octapole lens to provide conditions for CID. The new method showed improvements in sensitivity when compared to existing thermospray and dynamic liquid secondary-ion mass spectrometry methods.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290071018
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  • 3
    Electronic Resource
    Electronic Resource
    Automated routine thermospray mass spectrometry in the analysis of potential drug compounds (1993)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 7 (1993), S. 1055-1058 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A System to automate the analysis of routine mass spectrometry samples, using either a thermospray or particle-beam interface, has been developed. This has allowed unattended operation and has freed expert mass spectrometrists to address ‘real’ problems. The system also acts as a filter to the problem-solving service.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290071118
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  • 4
    Electronic Resource
    Electronic Resource
    Triton X-100 as a reference compound for ammonia high-resolution chemical ionization mass spectrometry and as a tuning and calibration compound for thermospray (1993)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 7 (1993), S. 1059-1061 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The non-ionic surfactant Triton X-100, 1-(1,1,3,3,-tetramethylbutyl)-4-[poly(1,2-ethanediol)]benzene, has been evaluted as a reference material for positive-ion high-resolution ammonia chemical ionization (CI) mass spectrometry and as a tuning and calibration material for positive-ion thermospray mass spectrometry (TSP). When ammonia is used as the CI reagent gas, Triton-X-100 produces evenly spaced ions that 44 u apart. Triton X-100 cab be volatilized from a solids prove and is routinely used as the reference material for high-resolution measurements. A reference table has been constructed from the theoretical values for the different masses. Triton X-100-Reduced and Triton X-405-Reduced were also evaluated as additional reference com-pounds. As a calibration and tuning compound for TSP, Triton X-100 affords an envelope of ions centred around m/z 600-700 with ions observed above m/z 1000. Triton X-100-Reduced affords a similar envelope although the ions observed are 6 u higher in mass.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290071119
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  • 5
    Electronic Resource
    Electronic Resource
    Analysis of the squalestatins by on-line packed capillary liquid chromatography/dynamic liquid secondary-ion/mass spectrometry (1993)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 7 (1993), S. 492-495 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A mixture of four squalestatins was separated and characterized by gradient-packed capillary liquid chroma-tography combined with dynamic liquid secondary-ion mass spectrometry (LSIMS). Thioglycerol/glycerol matrix was added post-column. Negative-ion LSIMS was found to afford spectra typified by strong molecular ions with structurally informative fragments. The new method showed improvements in sensitivity and specificity for this class of compound when compared to existing thermospray methods.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290070618
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  • 6
    Electronic Resource
    Electronic Resource
    Spatiotemporal temperature patterns during hydrogen oxidation on a nickel disk (1993)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 39 (1993), S. 1497-1508 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Spatiotemporal temperature patterns on a polycrystalline nickel disk were recorded using infrared video imaging during atmospheric hydrogen oxidation and characterized by the proper orthogonal decomposition pattern analysis technique. The system was studied at two different residence times, 3.2 s and 6.4 s. At moderate feed temperatures, steady-state multiplicity and rate oscillations were found. Oscillations at a residence time of 6.4 s were periodic and essentially spatially uniform. At a residence time of 3.2 s, however, the surface temperature became nonuniform, and rate oscillations occurred via traveling temperature waves which emanated from “pacemakers” (locally active regions) on the edge of the catalyst. During periodic oscillations, the waves were emitted synchronously from the pacemakers, while during chaotic oscillations, the pacemakers were desynchronized and emitted waves independently of each other. Nonlocal gas-phase coupling between distance surface elements caused spatial desynchronization during rate oscillations.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690390909
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  • 7
    Electronic Resource
    Electronic Resource
    Single-pore model: A simplified diffusion simulation (1991)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 37 (1991), S. 1245-1248 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690370815
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  • 8
    Electronic Resource
    Electronic Resource
    Melt filtration: The final step in the purification of PVC bottles for recycling (1992)
    Brookfield, Conn. : Wiley-Blackwell
    Journal of Vinyl and Additive Technology 14 (1992), S. 135-139 
    Details
    ISSN: 0193-7197
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The final step in the purification of PVC bottles for recycling is melt filtration. However, this common practice increases in complexity when dealing with a clear, thermally sensitive material such as PVC. This paper will explore both conventional and new techniques for melt filtration. This paper also describes various types of contamination found in the form of other polymers and foreign material, as well as experimental data on acceptable levels and processing conditions to purge them from the vinyl melt stream.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/vnl.730140305
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