title: Extraction mechanisms of charged organic dye molecules into silica-surfactant nanochannels in a porous alumina membrane.
abstract: Extraction mechanisms of charged organic dye molecules are examined for an assembly of silica-surfactant nanochannels with a channel diameter of 3.4 nm, which is formed inside the pores of an anodic alumina membrane by a surfactant-template method. Experimental results confirm that the extraction mechanism depends on the sign of a charge of the dye molecules. The extraction of the cationic rhodamine 6G is predominantly caused by an ion-pair extraction process, whereas an anion-exchange process is mainly responsible for the extraction of the anionic sulforhodamine B. These extraction mechanisms are discussed by considering the microstructures of the silica-surfactant nanochannels.
authors.affiliation: Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan. akira@anal.chem.tohoku.ac.jp
authors.forename: Akira
authors.initials: A
authors.lastname: Yamaguchi
authors.forename: Jun
authors.initials: J
authors.lastname: Watanabe
authors.forename: Mekawy M
authors.initials: MM
authors.lastname: Mahmoud
authors.forename: Rise
authors.initials: R
authors.lastname: Fujiwara
authors.forename: Kotaro
authors.initials: K
authors.lastname: Morita
authors.forename: Tomohisa
authors.initials: T
authors.lastname: Yamashita
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Amino
authors.forename: Yong
authors.initials: Y
authors.lastname: Chen
authors.forename: Logudurai
authors.initials: L
authors.lastname: Radhakrishnan
authors.forename: Norio
authors.initials: N
authors.lastname: Teramae