National Institute of Advanced Industrial Science and Technology

Harumi Ohyama

Masaru Yoshida

Haruhisa Kato

Nobuyuki Tamaoki

Nagatoshi Koumura

Yoko Matsuzawa

A photoresponsive ionic organic compound of formula (I); a method of producing the same; a photoresponsive carbon nanotube (CNT) dispersant; a CNT dispersion containing the dispersant; and a method of separating a CNT from the dispersion: wherein R, R, and Reach represent a hydrogen atom or an alkyl group; A represents &#x2014;CH&#x2014; or a nitrogen atom; X represents an anion; and n is a number to give a charge of &#x2212;2 to nX.

Photoresponsive ionic organic compound, method of producing the same, and photoresponsive carbon nanotube dispersant comprising said ionic organic compound

Disclosed are a novel ionic organic compound and a method for producing the ionic organic compound by a simple process. Also disclosed are a hydrogelling agent composed of an ionic organic compound obtained by the method, an alcohol gelling agent, a gel which uses the gelling agent, while using water or methanol as a medium, and a carbon nanotube dispersant composed of the compound. Specifically disclosed is an ionic organic compound represented by general formula (1). The compound is obtained by a condensation reaction of (A) an aromatic diamide compound or cyclohexane diamide compound having a 4-(chloromethyl)benzamide group at both ends, and (B) a compound selected from N,N,N',N&#x2032;-tetramethylalkylenediamines which may have a substituent wherein there are 1-6 carbon atoms between nitrogen atoms. The thus-obtained ionic organic compound serves as a gelling agent which is capable of gelling a neutral aqueous solution or an alcohol. The solvent solubility can be changed by substituting the anion of the thus-obtained ionic compound with another anion by anion-exchange. (In the formula, A represents a linking moiety having one or more optionally substituted aromatic rings or a linking moiety composed of a cyclohexane ring; B represents a cationic functional group having a quaternized nitrogen atom, which is selected from N,N,N&#x2032;,N&#x2032;-tetramethylalkylenediamines which may have a substituent wherein there are 1-6 carbon atoms between nitrogen atoms; X represents a monovalent anion; and n represents an integer of 1-800.)

Ionic organic compound, production method thereof, hydrogelling agent composed of the ionic organic compound, hydrogel containing same, methanol gelling agent, methanol gel containing same, and carbon nanotube dispersant

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Tsukuba, Japan

Harumi Ohyama