Liquid-crystal composition

A liquid-crystal composition comprising a liquid crystal having an Fd-3m structure, wherein

• the liquid-crystal composition is formed by blending a surfactant (a), an oil agent (b), and water (c);
• the surfactant (a) is a surfactant that forms at least one structural body (x) selected from a hexagonal structural body and a pre-hexagonal structural body when mixed with the water (c);
• the oil agent (b) is an oil agent that does not convert all of the structural body (x) into a lamellar structural body, when the composition is formed by blending;
• and
• a ratio between the surfactant (a) and the water (c) constituting the liquid-crystal composition is a ratio that forms the structural body (x) when mixing the surfactant (a) and the water (c),
• wherein the ratio between the surfactant (a) and the water (c) constituting the liquid-crystal composition is 0.1 or more and 0.9 or less, as the mass ratio of the component (a) to the total amount of the component (a) and the component (c), (a)/((a)+(c)),
• wherein the liquid-crystal composition contains the oil agent (b) with a content of 0.05 or more and 10 or less, as the mass ratio relative to the surfactant (a), (b)/(a),
• wherein the surfactant (a) is a nonionic surfactant,
• wherein the nonionic surfactant is a nonionic surfactant represented by the following general formula (al) or general formula (a2):
• R1a-A[(R2aO)x—R3a]y (a1)
• wherein R1a is a hydrocarbon group having 7 or more and 18 or less carbon atoms, R2a is an alkylene group having 2 or 3 carbon atoms, and R3a is an alkyl group having 1 or more and 3 or less carbon atoms, or a hydrogen atom;
• x is an average number of added moles and is a number of 3 or more and 50 or less;
• and A is —O—, —C(═O)O—, —C(═O)NH—, —C(═O)N═, —NH—, or —N═, and y is 1 when A is —O—, —C(═O)O—, —C(═O)NH—, or —NH— and y is 2 when A is —C(═O)N═ or —N═,
• [R11a—B—(R12aO)u]pGm[(OR12a)vOH]q (a2)
• wherein R11a represents a hydrocarbon group having 7 or more and 18 or less carbon atoms, and R12a represents an alkylene group having 2 or more and 4 or less carbon atoms;
• u and v are average numbers of added moles and are each independently a number of 0 or more and 40 or less, and u×p+v×q is 0 or more and 40 or less;
• G represents a polyhydric alcohol residue having 3 or more and 10 or less carbon atoms and having 3 or more and 10 or less hydroxy groups;
• m is an average condensation degree of G and is a number of 1 or more and 10 or less;
• p is 1 or more and is a number equal to or less than the number of hydroxy groups of Gm, and q is a number of the number of hydroxy groups of Gm-p;
• and B is —O— or —C(═O)O—,
• wherein the oil agent (b) is an oil agent having no hydroxy group, carboxy group, amino group, or amide group,
• wherein the oil agent (b) is one or more selected from the group consisting of a hydrocarbon oil having 8 or more and 36 or less carbon atoms, a fatty acid monoester formed of a fatty acid having 8 or more and 22 or less carbon atoms and a monohydric alcohol having 1 or more and 24 or less carbon atoms, a fatty acid diester formed of a fatty acid having 8 or more and 22 or less carbon atoms and a dihydric alcohol having 1 or more and 12 or less carbon atoms, a dicarboxylic acid diester formed of a dicarboxylic acid having 4 or more and 18 or less carbon atoms and a monohydric alcohol having 1 or more and 24 or less carbon atoms, a tricarboxylic acid triester formed of a tricarboxylic acid having 5 or more and 12 or less carbon atoms and a monohydric alcohol having 1 or more and 24 or less carbon atoms, and a glycerin fatty acid triester,
• wherein the liquid crystal having an Fd-3m structure is a reverse cubic liquid crystal in which the water forms a discontinuous phase.