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Browsing by Subject "Surface active agents"

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    • Article  

      Analytical separations using molecular micelles in open-tubular capillary electrochromatography 

      Kapnissi‐Christodoulou, Constantina P.; Akbay, C.; Schlenoff, J. B.; Warner, I. M. (2002)
      Open-tubular capillary electrochromatography (OT-CEC) is an alternative approach to conventional CEC. The primary advantage of OT-CEC is the elimination of problems associated with frits and silica particles in conventional ...

    • Article  

      Binding of sodium dodecyl sulfate to linear and star homopolymers of the nonionic poly(methoxyhexa(ethylene glycol) methacrylate) and the polycation poly(2-(dimethylamino)ethyl methacrylate): Electromotive force, isothermal titration calorimetry, surface tension, and small-angle neutron scattering measurements 

      Couderc-Azouani, S.; Sidhu, J.; Georgiou, Theoni K.; Charalambous, Despina C.; Vamvakaki, Maria; Patrickios, Costas S.; Bloor, D. M.; Penfold, J.; Holzwarth, J. F.; Wyn-Jones, E. (2004)
      The process of binding of sodium dodecyl sulfate (SDS) to various linear and star polymers of the nonionic methoxyhexa(ethylene glycol) methacrylate (PMHEGMA) and the ionic 2-(dimethylamino)ethyl methacrylate (PDMAEMA) was ...

    • Article  

      Binding of sodium dodecyl sulfate to linear and star homopolymers of the nonionic poly(methoxyhexa(ethylene glycol) methacrylate) and the polycation poly(2-(dimethylamino)ethyl methacrylate): Electromotive force, isothermal titration calorimetry, surface tension, and small-angle neutron scattering measurements 

      Couderc-Azouani, S.; Sidhu, J.; Georgiou, T. K.; Charalambous, C. D.; Vamvakaki, M.; Patrickios, C. S.; Bloor, D. M.; Penfold, J.; Holzwarth, J. F.; Wyn-Jones, E. (2004)
      The process of binding of sodium dodecyl sulfate (SDS) to various linear and star polymers of the nonionic methoxyhexa(ethylene glycol) methacrylate (PMHEGMA) and the ionic 2-(dimethylamino)ethyl methacrylate (PDMAEMA) was ...

    • Article  

      Can we use area per surfactant as a quantitative test model of specific ion effects? 

      Zemb, Th; Belloni, L.; Dubois, M.; Aroti, Andria; Leontidis, Epameinondas (2004)
      The three main currently proposed approaches for understanding specific ion effects are briefly described. In some experimentally well defined and simplified situations, one can decouple ion specificity effects from all ...

    • Article  

      Chiral separations using a polypeptide and polymeric dipeptide surfactant polyelectrolyte multilayer coating in open-tubular capillary electrochromatography 

      Kamande, M. W.; Zhu, X.; Kapnissi‐Christodoulou, Constantina P.; Warner, I. M. (2004)
      A polyelectrolyte multilayer (PEM) coating consisting of the polypeptide, poly(L-lysine) hydrobromide, poly(L-lysine) and the polymeric dipeptide surfactant, poly(sodium undecanoyl-L-leutcyl-alaninate), poly(L-SULA), is ...

    • Article  

      Chiral Separations Using Polymeric Surfactants and Polyelectrolyte Multilayers in Open-Tubular Capillary Electrochromatography 

      Kapnissi‐Christodoulou, Constantina P.; Valle, B. C.; Warner, I. M. (2003)
      In this study, fused-silica capillaries are modified using a polyelectrolyte multilayer (PEM) coating procedure in open-tubular capillary electrochromatography. The PEM coating was constructed in situ with alternating ...

    • Article  

      Comparative study of La-Sr-Fe-O perovskite-type oxides prepared by ceramic and surfactant methods over the CH4 and H2 lean-deNOx 

      Stathopoulos, Vassilis N.; Belessi, Vassiliki C.; Bakas, Thomas V.; Neophytides, Stylianos G.; Costa, Costas N.; Pomonis, Phillippos J.; Efstathiou, Angelos M. (2009)
      Mixed oxides of the general formula La0.8Sr0.2FeO3-x were prepared by ceramic and surfactant methods and tested towards the NO/H2/O2 and NO/CH4/O2 lean-deNOx reactions in the 200-450 °C range. The materials were characterized ...

    • Article  

      Formation mechanism of nanotubes comprising layers of PbS nanoparticles in polymer-surfactant solutions 

      Orphanou, M.; Leontidis, Epameinondas; Kyprianidou-Leodidou, Tasoula; Caseri, Walter; Krumeich, F.; Kyriacou, Kyriacos C. (2006)
      The crystallization of PbS in aqueous solutions containing the surfactant sodium dodecyl sulfate (SDS) and hydrophilic polymers resulted in a novel type of metastable nanotubes, the walls of which consist of layers of ...

    • Article  

      From beads-on-a-string to colloidal aggregation: novel crystallization phenomena in the PEO-SDS system 

      Leontidis, Epameinondas; Kyprianidou-Leodidou, Tasoula; Caseri, Walter; Kyriacou, Kyriacos C. (1999)
      The anionic surfactant sodium dodecyl sulfate (SDS) interacts strongly with poly(ethylene oxide) (PEO) in aqueous solution, forming micellar aggregates attached to the polymer chains above the so-called critical association ...

    • Article  

      From colloidal aggregates to layered nanosized structures in polymer-surfactant systems. 1. Basic phenomena 

      Leontidis, Epameinondas; Kyprianidou-Leodidou, Tasoula; Caseri, Walter; Robyr, P.; Krumeich, F.; Kyriacou, Kyriacos C. (2001)
      In this work, we examine the rich crystallization behavior that occurs in PbII/S-II/poly(ethylene oxide) (PEO)/sodium dodecyl sulfate (SDS) systems, in which the anionic surfactant interacts strongly with the polymer ...

    • Article  

      Gold colloids from cationic surfactant solutions. 1. Mechanisms that control particle morphology 

      Leontidis, Epameinondas; Kleitou, K.; Kyprianidou-Leodidou, Tasoula; Bekiari, Vlasoula; Lianos, P. (2002)
      The mechanism of formation of gold particles by reduction of AuIII in solutions of alcyltrimethylammonium chloride surfactants was studied in the absence and in the presence of NaCl. AuIII anions interact strongly with ...

    • Article  

      Precipitation of a water-soluble ABC triblock methacrylic polyampholyte: effects of time, pH, polymer concentration, salt type and concentration, and presence of a protein 

      Patrickios, Costas S.; Sharma, L. R.; Armes, S. P.; Billingham, N. C. (1999)
      The solution behavior of a low molecular weight ABC triblock methacrylic polyampholyte with the structure (dimethylaminoethyl methacrylate)8-(methyl methacrylate)12-(methacrylic acid)16 was investigated by turbidimetry. ...

    • Article  

      Reactivation of an aged commercial three-way catalyst by oxalic and citric acid washing 

      Christou, Stavroula Y.; Birgersson, H.; Fierro, José Luis García; Efstathiou, Angelos M. (2006)
      The efficiency of dilute oxalic and citric acid solutions on improving the oxygen storage capacity (OSC) and catalytic activity of a severely aged (83 000 km) commercial three-way catalyst (TWC) has been investigated. ...

    • Article  

      Room temperature synthesis and high temperature frictional study of silver vanadate nanorods 

      Singh, D. P.; Polychronopoulou, K.; Rebholz, Claus; Aouadi, S. M. (2010)
      We report the room temperature (RT) synthesis of silver vanadate nanorods (consisting of mainly β-AgVO3) by a simple wet chemical route and their frictional study at high temperatures (HT). The sudden mixing of ammonium ...

    • Article  

      Surfactant destabilization and non-linear phenomena in two-fluid shear flows at small Reynolds numbers 

      Kalogirou, Anna; Papageorgiou, Demetrios T.; Smyrlis, Yiorgos-Sokratis (2012)
      The flow of two superposed fluids in a channel in the presence of an insoluble surfactant is studied. Asymptotic analysis when one of the layers is thin yields a system of coupled weakly non-linear evolution equations for ...

    • Article  

      Synthesis, characterization, and evaluation as emulsifiers of amphiphilic-ionizable aromatic methacrylate ABC triblock terpolymers 

      Kyriacou, M. S.; Hadjiyannakou, Stella C.; Vamvakaki, Maria; Patrickios, Costas S. (2004)
      Four isomeric terpolymers based on benzyl methacrylate (BzMA, nonionic hydrophobic), 2-(dimethylamino)ethyl methacrylate (DMAEMA, ionizable hydrophilic), and methoxyhexa(ethylene glycol) methacrylate (HEGMA, nonionic ...

    • Doctoral Thesis  Open Access

      Παρασκευή μεσοπορωδών TiO2 & CeO2 με χρήση αντίστροφων μικυλίων μη-ιονικών τασιενεργών Triton X 

      Πασχαλίδου, Πολυξένη Ι. (Πανεπιστήμιο Κύπρου, Σχολή Θετικών και Εφαρμοσμένων Επιστημών / University of Cyprus, Faculty of Pure and Applied Sciences, 2019-03)
      Η τιτάνια και η δημήτρια βρίσκουν ευρεία εφαρμογή σε διάφορες βιομηχανικές εφαρμογές (π.χ. ετερογενής κατάλυση, φωτοκατάλυση, προσρόφηση, παραγωγή χρωστικών ουσιών) εξαιτίας των ηλεκτρονικών ιδιοτήτων, της σταθερότητας και ...

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