title: Facile fabrication and magnetic properties of a one-dimensional magnetite peapod in a lipid nanotube.
abstract: Magnetite nanoclusters (MNCs) were aligned one-dimensionally in the hollow cavity of a lipid nanotube (LNT) as a peapod using a simple mixing method in an aqueous solution. The electrostatic interaction of the two materials was considerable enough to allow the preparation of a densely packed MNC-LNT peapod composite. The composite was formed at a pH 5.4-6.8, i.e., near the isoelectric point of the MNCs. At a pH 5.4-6.8, there was neither a strong attractive nor repulsive electrostatic interaction between the surface of the MNC and the LNT. The MNCs-capped LNT composites were formed at basic conditions (above a pH 7.8) in which the MNCs and the LNT pushed each other because of their opposite surface charges. The magnetic property measurement revealed that the 1D aligned MNCs in the peapod structure had a much higher coercivity (10.6 Oe) than the bulk randomized MNCs (5.8 Oe).
authors.affiliation: Nanotube Research Center (NTRC), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan. han-119@aist.go.jp
authors.forename: Youn-Gyu
authors.initials: YG
authors.lastname: Han
authors.forename: Masaru
authors.initials: M
authors.lastname: Aoyagi
authors.forename: Masumi
authors.initials: M
authors.lastname: Asakawa
authors.forename: Toshimi
authors.initials: T
authors.lastname: Shimizu