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Extraction mechanisms of charged organic dye molecules into silica-surfactant nanochannels in a porous alumina membrane

2005; Elsevier BV; Volume: 556; Issue: 1 Linguagem: Inglês

10.1016/j.aca.2005.06.029

1873-4324

A. Yamaguchi, Jun Watanabe, Moataz Mekawy, Rise Fujiwara, K. Morita, Tomohisa Yamashita, Yosuke Amino, Yong Chen, Logudurai Radhakrishnan, Norio Teramae,

Analytical Chemistry and Chromatography

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.