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Filtering by: Creator DiFazio, Stephen P. Remove constraint Creator: DiFazio, Stephen P. Academic Affiliation Chemistry Remove constraint Academic Affiliation: Chemistry

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  • Classification of stationary phases in gas chromatography

    Creator:
    Chong, Elee Elizabeth
    Abstract:
    Ultraviolet spectroscopy and dispersive solubility parameters correlated to the ratios of retention times have proven valuable in classification of gas chromatography stationary phases by the donor-acceptor properties. Iodine was directly dissolved into stationary phases and the absorption frequency shift of complexes was correlated with the carbon tetrachloride/chloroform retention ratio on...
    Resource Type:
    Masters Thesis
    Full Text:
    Redacted for Privacy Abstract approved: Stephen J. Hawkes Ultraviolet spectroscopy and dispersive

  • Solid-phase synthesis and biophysical testing of uncharged acyclic oligonucleotide analogues

    Creator:
    Nelson, Jeffrey Stephen, 1962-
    Resource Type:
    Dissertation
    Full Text:
    bind its complementary DNA target p(dG)6 with a Tm = 19°C in a low salt buffer. Solid-Phase

  • The obstructive factor in gas chromatography

    Creator:
    Thumneum, Pornpan
    Abstract:
    The study of the obstructive factor by Hawkes (11) showed a relation between the obstructive factor and velocity using a continuous method. Later, Bowers and Hawkes (12) developed a similar method with some improvements in the apparatus and found out that the obstructive factor was not flow dependent. This study...
    Resource Type:
    Masters Thesis
    Full Text:
    : Redacted for Privacy J (Dr. Stephen J. Hawkes) The study of the obstructive factor by Hawkes (11) showed

  • Slow processes in gas-solid chromatography

    Creator:
    Burns, Walter Frederick
    Abstract:
    Gas-solid chromatography often has asymmetrical elution peaks. This is attributed to nonlinear isotherms, multi-energy adsorption sites, and slow processes. This study utilized a stopflow gas chromatograph with various NaOH and NaCl modified aluminas as adsorbents and methane as adsorbate to determine the influence of surface area and pore volume distribution...
    Resource Type:
    Masters Thesis
    Full Text:
    CHROMATOGRAPHY Abstract approved: Redacted for Privacy Stephen J. Hawkes Gas-solid chromatography often has

  • Classification of stationary liquids in gas chromatography by infrared spectrophotometry

    Creator:
    De Briceno, Maria Betania Orduz
    Abstract:
    A classification of stationary liquids by infrared spectroscopy to evaluate the polarity was made using the solvent effect technique. The infrared C-Cl absorption frequency shift was measured for solutions of 1-chlorohexane dissolved in each stationary phase. These frequency shifts were correlated to the relative retention times of 1-octene/n-octane, trans-2-octene/n-octane and...
    Resource Type:
    Masters Thesis
    Full Text:
    of butadiene and n-butane in a polar phase "p" and a non- polar one "u." Squalane was assigned to

  • Diffusion in silicone polymers

    Creator:
    Kong, Ming J.
    Abstract:
    The study of diffusion coefficients of n-alkanes and other organic compounds in silicones is undertaken by gas-liquid chromatography. About 0. 3% of stationary phase is coated on glass bead support so that the only significant source of peak spreading is due to slow liquid phase mass transfer. Diffusion coefficients are...
    Resource Type:
    Masters Thesis
    Full Text:
    ) (date) Title: DIFFUSION IN SILICONE POLYMERS Abstract approved: Redacted for privacy Stephen J

  • Fast gas chromotography

    Creator:
    Dandeneau, Raymond Dale
    Resource Type:
    Dissertation
    Full Text:
    Professor Stephen J. Hawkes, the person who has influenced my scientific training the most; I will be

  • Solute-solvent interactions in gas chromatography

    Creator:
    Chan, Edwin Ming Yeung
    Resource Type:
    Masters Thesis
    Full Text:
    following way where V N = KV L = KW p/s s [z] [3] [4] VL = the volume occupied by the solvent (c. c

  • Diffusion of n-alkanes in polydimethylsilicones

    Creator:
    Millen, William George
    Abstract:
    Diffusion of short chain n-alkanes was found to be faster in the polydimethylsilicone elastomer SE-30 than in the polydimethylsilicone oil SF-96-2000. The opposite was true for the longer chain n-alkanes suggesting that choice of stationary phase for gas chromatography would depend on the chain length of sample components. The dependence...
    Resource Type:
    Masters Thesis
    Full Text:
    PrivacyAbstract approved: Stephen J. Hawkes Diffusion of short chain n-alkanes was found to be faster in the

  • The diffusion coefficient of propane in helium

    Creator:
    Tang, Fa-tai
    Abstract:
    A specially designed gas chromatograph with both TCD and FID has been tested for the measurement of the diffusion coefficients of methane and propane in helium. Knox's arrested elution technique(⁴) was used and yielded a value of 0.6431 cm²/sec averaged with the value obtained by Yang and Hawkes(⁷). Values of...
    Resource Type:
    Masters Thesis
    Full Text:
    : Redacted for Privacy Dr. Stephen J. Hawkes A specially designed gas chromatograph with both TCD and FID