Chemical Engineering / Kimya Mühendisliği

Permanent URI for this collectionhttps://hdl.handle.net/11147/14

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Now showing 1 - 10 of 28
  • Conference Object
    Citation - WoS: 24
    Effect of pH and Hydration on the Normal and Lateral Interaction Forces Between Alumina Surfaces
    (2006) Polat, Mehmet; Sato, Kimiyasu; Nagaoka, Takaaki; Watari, Koji
    Normal and lateral interaction forces between alumina surfaces were measured using Atomic Force Microscopy-Colloid Probe Method at different pH. The normal force curves exhibit a well-defined repulsive barrier and an attractive minimum at acidic pH and the DLVO theory shows excellent agreement with the data. The normal forces are always repulsive at basic pH and the theory fails to represent the measurements. Lateral forces are almost an order of magnitude smaller in the basic solutions. These differences, which have important implications in the study of stability and rheology, are attributed to the hydration of the alumina surface at basic pH. © 2013 Elsevier B.V., All rights reserved.
  • Conference Object
  • Book Part
    A Study on Absorption and Reflection of Infrared Light by the Uncoated and Al Coated Surfaces of Polymer Films Techniques
    (Apple Academic Press, 2014) Arkış, Esen; Balköse, Devrim
    Polymer films coated with a thin layer of aluminum or aluminum oxide are extensively used in food packing as heat shields. The infrared rays were not transmitted through the films and were reflected protecting the contents from the harmful effects of infrared light. The quantitative measurement of the film thickness and infrared light reflection and absorption capacities of aluminum coated films used as packing materials were possible using infrared spectroscopy. © 2015 by Apple Academic Press, Inc.
  • Book Part
    Calcium Soap Lubricants
    (CRC Press, 2015) İzer, Alaz; Kahyaoğlu, Tuğçe Nefise; Balköse, Devrim
    The reparation and characterization of calcium stearate (CaSt2) and a lubricant by using calcium stearate were aimed at in this study. Calcium stearate powder was prepared from sodium stearate and calcium chloride by precipitation from aqueous solutions. CaSt2 and the Light Neutral Base oil were mixed together to obtain lubricating oil. It was found that CaSt2 had a melting temperature of 142.8 °C and in base oil it had a lower melting point, above 128 °C. It was dispersed as lamellar micelles as the optical micrographs had shown. From rate of settling the size of dispersed particles were found to be 1.88 µm and 0.11 µm for lubricants having 1% and 2% CaSt2, respectively. The friction coefficient and wear scar diameter of base oil 0.099 and 1402 nm were reduced to 0.0730 and 627.61 nm respectively for the lubricant having 1% CaSt2. Lower wear scar diameter (540 nm) was obtained for lubricant with 2% CaSt2. CaSt2 improved the lubricating property of the base oil but did not improve its oxidative and thermal stability. © 2015 by Apple Academic Press, Inc.
  • Article
    Citation - Scopus: 1
    Visualization of Equilibrium Fcc Catalyst Surface by Afm and Semeds
    (American Chemical Society, 2003) Bayraktar, Oğuz; Erdoğan, Gani; Kugler, Edwin L.
    [No abstract available]
  • Conference Object
    Effect of Some Physical, and Chemical Variables on Flocculation and Sediment Behaviour
    (A.A. Balkema Publishers, 2000) Polat, Hürriyet; Polat, Mehmet; İpekoğlu, Üner
    Effect of some chemical and physical variables on the settling rate, final sediment height, sediment viscosity and supernatant turbidity of a clay sample was studied using various polyacrylamide type flocculants. Increasing flocculant concentration significantly increased both the settling rate and sediment viscosity. More importantly, changes in the final sediment, height, hence the packing density, was minimal for all the conditions tested once the sediment was allowed to consolidate. Also, the mode of addition of the polymer, at once or continuous, did not seem to affect any of the parameters measured. Conditioning time seemed to alter the settling rate at low polymer concentrations, but had no effect at high polymer concentrations. However, increasing the conditioning time caused a decrease in the sediment viscosity. Different types of the polyacrylimides generated different settling rates at a given concentration, but the final sediment height was nearly independent of polymer type.
  • Conference Object
    Predicting Drying in Solvent-Coated Polymeric Films
    (American Chemical Society, 2000) Alsoy Altınkaya, Sacide; Duda, John Larry
    [No abstract available]
  • Conference Object
    Visualization of Equilibrium Fcc Catalyst Surface by Afm and Sem-Eds
    (American Chemical Society, 2003) Bayraktar, Oğuz; Erdoğan, G.; Kugler, Edwin L.
    [No abstract available]
  • Conference Object
    Fret based pattern recognition of isogenic cells differing in cell surface glycans
    (American Chemical Society, 2010) Miranda, Oscar R.; Bajaj, Avinash; Elçi, Şükrü Gökhan; Rana, Subinoy; Saha, Krishnendu; Phillips, Ronnie L.; Rotello, Vincent M.
    [No abstract available]
  • Conference Object
    Raft-Synthesis of Cholesterol Conjugated Polymers as Potential Therapeutic Carriers
    (American Chemical Society, 2011) Sevimli, Sema; İnci, Fatih; Bulmuş, Volga
    [No abstract available]