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The Partition/Adsorption Model For The Description Of The Retention Mechanism In Reversed Phase Liquid Chromatography, Tarun S. Patel

Seton Hall University Dissertations and Theses (ETDs)

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Assembly And Characterization Of Sams Formed By The Adsorption Of Alkanethiols On Zinc Selenide Substrates, Alison Noble, Ralph G. Nuzzo

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Alkanethiols HS(CH₂)_nCH₃ (n = 7, 11, 15, 17) and the hydroxy functional thiol HS(CH₂)₁₂OH are shown to adsorb from solution onto zinc selenide crystals and form well-organized monolayers. The chemisorption of these organosulfur compounds has been studied using transmission Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and surface wetting properties. FTIR indicates that the longer chain alkanethiols (n = 15, 17) form well-defined SAMs with crystalline-like conformations of the chains within the monolayers. As the chain length decreases, there is less conformational order …

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Investigation Of The Microporous And Mesoporous Structures Of The Reşadiye (Tokat/Turkey) Bentonite And Its Fractions, Müşerref Önal, Yüksel Sarikaya, Tülay Alemdaroğlu

Turkish Journal of Chemistry

It was determined by X-ray diffraction that, besides containing clay minerals such as montmorillonite and illite, the original bentonite contained also clinoptilolite, opal-C, quartz, calcite and dolomite. The original bentonite was separated into four fractions by decantation and precipitation from its aqueous suspension. The adsorption and desorption of nitrogen on the original bentonite and its fractions at 77 K were investigated. The specific surface areas of the samples were determined according to the methods of Brunauer-Emmett-Teller, de Boer-Lippens, and Harkins-Jura by using the adsorption data. The mesopore size distribution curves were plotted by using the desorption data. The specific micropore …