METHODS FOR CONTROLLING SURFACE FUNCTIONALITY OF METAL OXIDE NANOPARTICLES, METAL OXIDE NANOPARTICLES HAVING CONTROLLED FUNCTIONALITY, AND USES THEREOF
申请人:White Meghann A.
公开号:US20080299046A1
公开(公告)日:2008-12-04
Methods for controlling surface functionality of metal oxide nanoparticles, nanoparticles having controlled surface functionality, and uses thereof are described herein. Methods for controlling the surface functionality of a metal oxide nanoparticle are can include attaching a ligand to a metal oxide nanoparticle, where the ligand can include a functional portion that is capable of forming an irreversible bond with an object at a site that is complementary to the functional portion without reacting with other reactive sites that may be present. Moreover, metal oxide nanoparticles having versatile ligands can include an anchoring portion that binds to the surface of the metal oxide nanoparticle and a functional portion that is capable of forming an irreversible bond with an object at a site that is complementary to the functional portion without reacting with other reactive sites that may be present. Uses thereof can include cancer detection, electronics, cosmetics, cellular delivery carriers, magnetic storage media, drug delivery carriers, nanocomposite formation for improved mechanical properties, and the like.
The azulene ring as a structural element in liquid crystals
作者:Siân E. Estdale、Roger Brettle、David A. Dunmur、Charles M. Marson
DOI:10.1039/a606139g
日期:——
A new approach to the synthesis of azulene liquid crystals is described
based on Hafner’s procedure involving reaction of a pyridinium salt
with a cyclopentadienide. The preparation of a variety of liquid
crystalline materials using this method is described. Variants are
reported with single substituents on the azulene ring in the 6-position
and doubly substituted in the 2, 6- positions. The effect of the azulene
ring as a core or dipolar terminal structural element is explored.
6-(5-Alkyl-1,3-dioxan-2-yl)azulenes are shown to exhibit smectic A phases
and 2-cyclohexyl-6-(5-tridecyl-1,3-dioxan-2-yl)azulene show smectic A and
B phases. Phase characterisation of the materials is recorded together
with X-ray measurements on the smectic A phase of one representative
compound. Results of dichroism studies on the azulene mesogens are also
briefly reviewed.
Liquid Crystal Materials with Sulfur Atoms Incorporated in the Principal Structure. VI. Optically Active New Smectic Liquid Crystal Compounds with 1,3-Oxathiane or 1,3-Dithiane Ring
(+)-2-Methylbutyl p-(5-alkyl-1,3-oxathian-2-yl)benzoate and -cinnamate (7) were synthesized. The mesomorphic behavior of these compounds were measured. Though (+)-2-methylbutyl p-(5-alkyl-1,3-oxathian-2-yl)benzoate did not exhibit any liquid-crystal phase, the corresponding 1,3-dithiane compounds (8-1, 8-2, and 8-3) and compound (7-4) having R’ of a normal alkyl chain exhibited a smectic phase. This
Preparation de derives de composes crown-4 a cycles de 13 a 16 membres, en vue d'obtenir des ionophores selectifs du lithium. Les mesures potentiometriques montrent que c'est les composes 14-crown-4 et 15-crown-4 qui possedent les meilleurs proprietes
准备 de 派生 de composes Crown-4 a cycle de 13 a 16 membres, en vue d'obtenir des ionophores selectifs du 锂。Les mesures potentiometriques montrent que c'est les composes 14-crown-4 et 15-crown-4 qui possedent les meilleurs proprietes