▎ 摘　　要

NOVELTY - Preparing monodomain hydrated inorganic salt phase change material comprises (1) applying direct current (DC) electric field to hydrocolloid in direct current electric field, so that nanoparticles in the hydrocolloid exhibit uniform orientation, (2) flowing the colloid with uniform orientation through the liquid nitrogen pipeline at stable speed, and freeze-drying to obtain nanoparticle aerogel with uniform orientation, (3) using plasma to polarize the surface of the nanoparticle aerogel to generate oxygen-containing groups, spraying the surface of the nanoparticle aerogel with polyimide solution, (4) heating and melting the hydrated inorganic salt crystal to obtain isotropic inorganic salt solution, and vacuum defoaming to obtain the inorganic salt solution-nanoparticle aerogel, and (5) placing the inorganic salt solution-nanoparticle aerogel under certain temperature gradient field, and obtaining monodomain hydrated inorganic salt phase change material with uniform orientation. USE - The method is useful for preparing monodomain hydrated inorganic salt phase change material. ADVANTAGE - The material can improve the thermal conductivity and the phase change enthalpy value of the phase change material. DETAILED DESCRIPTION - Preparing monodomain hydrated inorganic salt phase change material comprises (1) applying 100-10000 V direct current (DC) electric field to the hydrocolloid in direct current electric field, so that the nanoparticles in the hydrocolloid exhibit uniform orientation, (2) flowing the colloid with uniform orientation in the step (1) through the liquid nitrogen pipeline at stable speed, so that the nanoparticles in the colloid are solidified and shaped, and freeze-drying to obtain nanoparticle aerogel with uniform orientation, (3) using plasma to polarize the surface of the nanoparticle aerogel in the step (2) to generate oxygen-containing groups, spraying the surface of the nanoparticle aerogel with polyimide solution, so that the polyimide is combined with oxygen atoms to form an anchor layer on the surface of the nanoparticle aerogel, (4) heating and melting the hydrated inorganic salt crystal to obtain isotropic inorganic salt solution, filling the inorganic salt solution into the nanoparticle aerogel with polyimide anchored on the surface, and vacuum defoaming to obtain the inorganic salt solution-nanoparticle aerogel, and (5) placing the inorganic salt solution-nanoparticle aerogel under certain temperature gradient field, using mobile ultrasonic device to slowly move through the inorganic salt solution-nanoparticle aerogel from the high temperature section of the temperature gradient field to the end of the low temperature section of the temperature gradient field, where the temperature of the high temperature section is 60-100℃, the temperature of the low temperature section is 0-40℃, and the temperature difference is 56-100℃, slowly crystallizing the inorganic salt solution under the combined induction of temperature gradient field and mobile ultrasonic wave, and obtaining monodomain hydrated inorganic salt phase change material with uniform orientation. An INDEPENDENT CLAIM is also included for monodomain hydrated inorganic salt phase change material prepared by the preparation method.