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Journal of colloid and interface science v.512, 2018년, pp.29 - 38   SCI SCIE
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Adsorption characteristics of charged and nonionic small molecules to colloidal alumina

Pansare, Vikram J. (Department of Chemical and Biological Engineering, Princeton University, Princeton, NJ 08540, United States ) ; Hwang, Victoria (Department of Chemical and Biological Engineering, Princeton University, Princeton, NJ 08540, United States ) ; Figueroa, Carlos (Department of Chemical and Biological Engineering, Princeton University, Princeton, NJ 08540, United States ) ; Prud'homme, Robert K. (Department of Chemical and Biological Engineering, Princeton University, Princeton, NJ 08540, United States ) ;
  • 초록  

    Abstract Dense fluorescent pigments used for inkjet printing of UV and IR-readable non-photobleaching security features require stabilizers to prevent aggregation/sedimentation and inkjet head clogging at high resolution. A study of small molecule adsorption to α-alumina, a model system for security pigments, is presented. Alumina is dispersed by two methods yielding different zeta potentials but identical isoelectric points. Essentially complete dispersion is obtained in water at pH 3 but aggregation occurs at pH 6 where the surface charging is lower. Adsorption studies focus on the naphthyl-phosphate, -sulfate, and hydroxyl (triethylene glycol) groups. Phosphate adsorption was strongest with a 1.2 molecules/nm 2 plateau, close to the titratable exchange capacity of 1.3 OH groups/nm 2 on the alumina surface with ΔH adsorption =−7. −7.58±1.63kJ/mol determined by calorimetry. Sulfate adsorption was weaker with a more linear adsorption isotherm. The adsorption/exchange process yields a rise in pH that is correlated with the binding strength. Hydroxyl binding is weakest, being driven by hydrogen bonding, and showed no rise in pH during adsorption. A polyphosphate-poly(ethylene glycol) block copolymer is expected to be advantageous for the dispersion of such inkjet colloids. Graphical abstract [DISPLAY OMISSION]


  • 주제어

    Alumina .   Aharged small molecule .   Adsorption isotherm .   Isothermal calorimetry .   Stabilization .   Inkjet.  

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