Pore size and surface charge control in mesoporous TiO(2) using post-grafted SAMs

Physical Chemistry Chemical Physics : PCCP
Dereje Hailu TaffaMichael Wark

Abstract

Two types of TiO(2) are used as mesoporous scaffolds, one (i) randomly sintered yielding an average pore size of 15-20 nm including bottlenecks of 1-3 nm (s-TiO(2)), the other (ii) prepared by evaporation-induced self-assembly with a pore size of 7-9 nm (t-TiO(2)). The pore walls of these materials were post-grafted with phosphonic acids bearing one or two pyridinium or sulfonate head groups via 6, 10 or 14 methylene groups, in order to tune the free pore diameter and the surface charge over a broad range. The modification was characterized by FTIR spectroscopy. Charge transport through the modified pores was investigated by cyclic voltammetry using [Fe(CN)(6)](4-/3-), [IrCl(6)](2-/3-) [Ru(NH(3))(6)](3+/2+), and (ferrocenylmethyl)trimethylammonium as electroactive tracer ions and La(3+) or naphthalene trisulfonate as non-electroactive species. The Faradaic current through the pores is controlled by the combination of surface charge, tracer ion charge, charge of the non-electroactive ions present, as well as the pore diameter. High currents due to strong preconcentration are observed, e.g. a partitioning coefficient value of 7 x 10(3) for [Fe(CN)(6)](4-/3-) on a modified electrode making it a candidate for ion-exchange voltammet...Continue Reading

References

Dec 6, 2002·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Karl-Richard Meier, Michael Grätzel
Nov 19, 2004·Journal of the American Chemical Society·Filippo De AngelisAnnabella Selloni
May 7, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Vellaichamy Ganesan, Alain Walcarius
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Oct 7, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Elizabeth V MilsomFrank Marken
Nov 16, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Dina Fattakhova RohlfingMichael Wark
Jun 14, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·Simona Asaftei, Lorenz Walder
Apr 2, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Derejehailu TaffaLorenz Walder

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Citations

Mar 24, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Annette BrunsenOmar Azzaroni
Jan 4, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Liangcheng CaoYuechuan Wang
Dec 25, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Fabio KrohmAnnette Brunsen
Jul 4, 2017·ACS Applied Materials & Interfaces·Anna Cattani-Scholz
Mar 16, 2012·Nanoscale·Galo J A A Soler-IlliaCedric Boissiere
Apr 12, 2011·Physical Chemistry Chemical Physics : PCCP·Robert Schiller, Ákos Horváth
Nov 30, 2011·Physical Chemistry Chemical Physics : PCCP·Je Hyun BaeTaek Dong Chung
Sep 28, 2017·Physical Chemistry Chemical Physics : PCCP·Juan F AngioliniValeria Levi
Jul 6, 2014·Chemical Communications : Chem Comm·Debabrata SarkarRoie Yerushalmi
Feb 14, 2015·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Patrick Huber
Apr 17, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Sebastián AlbertiGalo J A A Soler-Illia

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