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Browsing by Subject "cation"

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    • Article  

      Activated biochar derived from cactus fibres - Preparation, characterization and application on Cu(II) removal from aqueous solutions 

      Hadjittofi, Loukia; Prodromou, Melpomeni; Pashalidis, Ioannis (2014)
      The adsorption efficiency of activated biochar prepared from cactus fibres regarding the removal of Cu(II) from aqueous solutions has been investigated as a function of various physicochemical parameters (e.g. pH, initial ...

    • Article  

      Cationic amphiphilic model networks based on symmetrical ABCBA pentablock terpolymers: Synthesis, characterization, and modelling 

      Triftaridou, Aggeliki I.; Vamvakaki, Maria; Patrickios, Costas S. (2007)
      Eight isomeric networks based on equimolar terpolymers were synthesized using group transfer polymerization (GTP) and were characterized in terms of their swelling properties. Two hydrophilic monomers, the nonionic methoxy ...

    • Article  

      Cationic double-hydrophilic model networks: Synthesis, characterization, modeling and protein adsorption studies 

      Loizou, Elena; Triftaridou, Aggeliki I.; Georgiou, Theoni K.; Vamvakaki, Maria; Patrickios, Costas S. (2003)
      Group transfer polymerization (GTP) was used for the preparation of eight networks based on two hydrophilic monomers, 2-(dimethylamino)ethyl methacrylate (DMAEMA) and poly(ethylene glycol) methacrylate (PEGMA). Ethylene ...

    • Article  

      Cationic nanoparticles have superior transvascular flux into solid tumors: Insights from a mathematical model 

      Stylianopoulos, T.; Soteriou, K.; Fukumura, D.; Jain, R. K. (2013)
      Despite their great promise, only a few nanoparticle formulations have been approved for clinical use in oncology. The failure of nano-scale drugs to enhance cancer therapy is in large part due to inefficient delivery. To ...

    • 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  

      Competitive sorption of Cu(II), Eu(III) and U(VI) ions on dunite in aqueous solutions: A potentiometric study 

      Konstantinou, M.; Pashalidis, Ioannis (2010)
      The competitive sorption of Cu(II), Eu(III) and U(VI)) ions in aqueous solutions by dunite, has been investigated by potentiometry at pH 6, I = 0.1 M NaClO4 and 25°C. Numerical analysis of the experimental data supports ...

    • Article  

      Direct detection of Fe(IV)=O intermediates in the cytochrome aa3 oxidase from Paracoccus denitrificans[H2O2 reaction 

      Pinakoulaki, Eftychia; Pfitzner, U.; Ludwig, B.; Varotsis, Constantinos (2003)
      We report the first evidence for the formation of the "607- and 580-nm forms" in the cytochrome oxidase aa3/H2O2 reaction without the involvement of tyrosine 280. The pKa of the 607-580-nm transition is 7.5. The 607-nm ...

    • Article  

      Hofmeister anion effects on surfactant self-assembly and the formation of mesoporous solids 

      Leontidis, Epameinondas (2002)
      Recent work on mesoporous silica formation using cationic and non-ionic templates has unveiled a large number of anion effects. Anions are seen to change the hydrolysis rates of the silicate precursors, affecting the surface ...

    • Article  

      The ion-lipid battle for hydration water and interfacial sites at soft-matter interfaces 

      Leontidis, Epameinondas; Christoforou, Maria; Georgiou, Christiana A.; Delclos, Thomas (2014)
      At charged surfaces "bound" ions reduce the repulsive electrostatic forces, while dissociated ions control the osmotic pressure in colloidal systems. For systems charged through ionic adsorption on the other hand, the ...

    • Article  

      Open-tubular capillary electrochromatography/electrospray ionization-mass spectrometry using polymeric surfactant as a stationary phase coating 

      Zhu, X.; Kamande, M. W.; Thiam, S.; Kapnissi‐Christodoulou, Constantina P.; Mwongela, S. M.; Warner, I. M. (2004)
      We describe the use of the polymeric surfactant poly(sodium undecylenic sulfate) (poly-SUS) as a stationary phase coating in open-tubular capillary electrochromatog raphy (OT-CEC) coupled with electrospray ionization-mass ...

    • Article  

      Photochemistry of an azido-functionalized cryptand: Controlling the reactivity of an extremely long-lived singlet aryl nitrene by complexation to alkali cations 

      Bucher, G.; Tönshoff, C.; Nicolaïdes, Andrew N. (2005)
      Photolysis of the cryptand 1, bearing an intraannular azido substituent, results in a complex photochemistry. Low-temperature photolysis yields the triplet nitrene 32, which has been characterized by EPR spectroscopy. Small ...

    • Article  

      Radium removal from aqueous solutions by adsorption on non-treated and chemically modified biomass by-product 

      Prodromou, Melpomeni; Pashalidis, Ioannis (2013)
      The adsorption efficiency of a biomass by-product (olive cake) regarding the removal of radium (226Ra) from aqueous solutions has been investigated prior and after its chemical treatment. The chemical treatment of the ...

    • Article  

      Studies on the interaction of olive cake and its hydrophylic extracts with polyvalent metal ions (Cu(II), Eu(III)) in aqueous solutions 

      Konstantinou, M.; Kolokassidou, K.; Pashalidis, Ioannis (2009)
      The paper presents and discusses the chemical affinity of two different forms of natural organic matter (e.g. in solid (SOM) and soluble form (DOM)) for Cu2+ and Eu3+ ions. In the this study SOM is represented by olive ...

    • Article  

      Use of chiral amino acid ester-based ionic liquids as chiral selectors in CE 

      Stavrou, Ioannis J.; Kapnissi‐Christodoulou, Constantina P. (2013)
      In this study, the applicability of a chiral ionic liquid (CIL) as the sole chiral selector in CE was investigated for the first time. In particular, five amino acid ester-based CILs were synthesized and used as additives ...

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