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  • Electronic Resource  (18)
  • Analytical Chemistry and Spectroscopy  (14)
  • 42.82  (4)
  • 1
    Electronic Resource
    Electronic Resource
    An integrated organic photoconductive detector for optoelectronics (1989)
    Springer
    Applied physics 48 (1989), S. 219-224 
    Details
    ISSN: 1432-0649
    Keywords: 42.80 ; 42.82 ; 72.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In the system (poly-(N-vinyl carbazole) (PVK): trinitrofluorenone (TNF) a photoconductive complex is formed. Thin metal films are sputtered on BK7 glass substrates, forming two electrodes with 1 mm separation. The photoconductive complex is deposited from a solution in chlorobenzene/tetrahydrofurane on the glass substrate between the electrodes, forming a photoconductive detector. Photoconductivity of these planar detectors is studied using He-Ne laser light (λ=633 nm) as a function of electric field and for different TNF concentrations. An increase of photosensitivity is found for high TNF concentrations. Time resolution of the photoconductive PVK:TNF detector is investigated using a ruby pulse laser (λ=694 nm). The possible use of such detectors in combination with other polymer lightguides is demonstrated. Compared to most polymer waveguide materials PVK exhibits a rather high refractive index ofn=1.7. Thus the coupling of light into the photoconductive film is achieved directly. The planar structure allows further integration of polymeric components for optoelectronics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00694348
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  • 2
    Electronic Resource
    Electronic Resource
    Elastooptic investigations in functional allyl polymer lightguides (1996)
    Springer
    Applied physics 63 (1996), S. 609-615 
    Details
    ISSN: 1432-0649
    Keywords: 42.79.h ; 42.79.P,Q ; 42.82 ; 71.29.Hk
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Planar waveguides of the allyl polymer poly-(terephthal acid diallyl ester) (PDATP) exhibiting a particular high stress optical coefficient are investigated. Internal mechanical stress may be introduced in the wave-guides by the in-diffusion of small vapour molecules or by the activation of a piezoelectric transducer in the substrate. Based on the induced stress the feasibility of gas sensors or electro acousto optic phase shifters (V π=180 V) with these waveguides is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01831001
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Compensation of temperature drift in leaky-mode spectra for sensor applications (1994)
    Springer
    Applied physics 58 (1994), S. 215-218 
    Details
    ISSN: 1432-0630
    Keywords: 42.82 ; 42.79
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Leaky-mode spectroscopy enhanced with semitransparent metal films may be effectively used for optical gas detection. Most of the optical sensors show a large temperature drift which is detrimental for application purposes. In this paper a model for the compensation of a particular line shift in the leaky-mode spectrum is given and it is confirmed experimentally.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324378
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  • 4
    Electronic Resource
    Electronic Resource
    Thermo-optical investigation of clamped ferroelectric polymer films (1994)
    Springer
    Applied physics 58 (1994), S. 589-593 
    Details
    ISSN: 1432-0630
    Keywords: 78.66.Qn ; 42.82 ; 77.80 ; 65.70.+y
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Attenuated total reflection leaky-mode spectroscopy is used for a thermo-optical investigation of a clamped film of the ferroelectric vinylidene fluoridetrifluoroethylene copolymer. A hysteresis loop for the optical parameters refractive index and film thickness is found for a full temperature cycle between 25° C and 60° C. In the vicinity of the ferroelectric/paraelectric phase transition increased optical losses are found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00348170
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  • 5
    Electronic Resource
    Electronic Resource
    Combined thin-layer chromatography/mass spectrometry without substance elution: Application to the rapid analysis of dipeptide mixtures (1987)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 14 (1987), S. 5-7 
    Details
    ISSN: 0887-6134
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The simple combination of thin-layer chromatography on polyamide with subsequent mass spectrometry of the separated compounds together with the carrier material has been employed for unambiguous identification of individual dipeptides in a mixture. The dipeptides were analysed in the form of their dansyl methyl ester derivatives. The appearance of molecular ions in the electron impact mass spectra simultaneously with the ions dans-NH=CHR⌝+ indicating the corresponding N-terminal amino acid residue enables a rapid and sensitive structure elucidation of the dipeptides. The chromatography and mass spectrometry can be performed with 0.2-0.3 nmol dipeptide.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200140104
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  • 6
    Electronic Resource
    Electronic Resource
    Concentration-dependent behavior of drugs in capillary gas chromatography using splitless injection (1983)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 6 (1983), S. 40-42 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary columns ; Splitless Injection ; Drug analysis ; Concentration dependence of retention values ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240060111
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  • 7
    Electronic Resource
    Electronic Resource
    Determination of mono- to tetracyclic aromatic hydrocarbons in lubricating oil (1992)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 15 (1992), S. 827-833 
    Details
    ISSN: 0935-6304
    Keywords: GC ; Lubricating Oil ; Polycyclic aromatic hydrocarbons (PAH) ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Liquid - liquid extraction with N-methyl-2-pyrrolidone, combined with solid-phase extraction on silica gel using n-pentane and dichloromethane as solvents, has been used for the isolation and concentration of the aromatic fraction from lubricating oil.The identification of individual compounds in this aromatic fraction was performed by capillary gas chromatography-mass spectrometry (CGC-MS) and by determination of retention indices. Quantitative results were obtained by flame ionization detection (CGC-FID). Eighty four compounds, predominantly naphthalenes, phenanthrenes, biphenyls, fluorenes, dibenzo-thiophenes, and their alkylated derivatives, have been identified in a commercial lubricating oil. The total amount of the aromatic fraction did not exceed 0.04 % of the oil.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240151211
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  • 8
    Electronic Resource
    Electronic Resource
    Evaluation of dead time calculation in liquid chromatography using a linearization procedure for homologous series (1987)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 10 (1987), S. 191-200 
    Details
    ISSN: 0935-6304
    Keywords: Liquid chromatography, HPLC ; Dead time calculation ; Homologous series ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A mathematical method for the calculation of the dead time (tm) in HPLC was evaluated using a computer simulation approach, in which artificial perturbations were introduced to Simulated homolog retention times. The calculation was based on a modified and extended Grobler and Bálisz (GB) method. Investigated wav how the precision of the calculated tM is affected by: statistical fluctuations in retention times and which, and how many homolog retention times are used. Based on these simulations a two-step procedure for the tM calculation is proposed: In the first step the linearity of log tR, n vs carbon number n is checked using as many homolog retention times as possible. The slope value bo of the first linear regression in the GB method is used for the selection of homolog retention times in the final tM calculation. In the second step the optimal selection of homologs is made and the final tM calculation is carried out. Guidelines for homolog selection are given.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240100407
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  • 9
    Electronic Resource
    Electronic Resource
    Structure-type separation of diesel fuels by solid phase extraction and identification of the two- and three-ring aromatics by capillary GC-mass spectrometry (1991)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 14 (1991), S. 91-98 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Solid phase extraction ; Structure-type separation ; Polycyclic aromatic hydrocarbons (PAHs) ; Diesel fuel ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A simple and effective solid phase extraction (SPE) method using silica gel micro glass columns has been developed for the separation of diesel fuel into groups of aliphatic, and mono-, di- and polyaromatic hydrocarbons. It is based on a stepwise gradient of dichloromethane in n-pentane. The resulting fractions were analyzed by capillary gas chromatography with a flame ionization detector and coupled gas chromatography-mass spectrometry.Commercially available standards, and retention indices and mass spectra were used for identification of individual aromatic compounds. The principal polycyclic aromatic hydrocarbons (PAHs) in diesel fuel are naphthalene, biphenyl, fluorene, phen-anthrene and their alkylated derivatives. Sulfur-containing PAHs are mainly represented by methyl-substituted dibenzo-thiophenes.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240140205
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  • 10
    Electronic Resource
    Electronic Resource
    Influence of development distance on resolution in thin-layer chromatography (1983)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 6 (1983), S. 82-88 
    Details
    ISSN: 0935-6304
    Keywords: Thin-layer chromatography, TLC ; Resolution ; Optimization ; Development distance ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Theoretical equations are given to relate resolution with development distance. Comparative experiments undertaken with quaternary ammonium compounds as test substances and using a selection of basic drugs are presented. As expected, resolution decreases with shorter development distance. However, this effect is less pronounced for compounds with small Rf values and when the spot size at the starting point is kept small. It was also shown that, for correctly assessing resolution in relation to development distance, the amounts of material spotted have to be decreased for shorter development distances.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240060207
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