▎ 摘　　要

NOVELTY - Preparation of hierarchical nano-hybrid material involves hydrolyzing medical absorbent cotton with acid solution to form cellulose nanocrystals aqueous suspension (CNCs), mixing purified cotton and preheated acid solution, stirring the obtained CNCs suspension to obtain stable suspension, mixing iron chloride hexahydrate, iron chloride tetrahydrate, suspension of CNCs, and ammonium hydroxide to obtain iron oxide doped cellulose nanocrystals nano-hybrid membrane, dispersing CNCs dispersion and polyethylene glycol (PEG) in deionized water, stirring with graphene (G) nanosheets in polystyrene dish, drying, peeling off membrane to obtain G/PEG/CNCs nano-hybrid membrane, using rare earth magnets to collect iron oxide doped CNCs nano-hybrid membrane, mixing the G/PEG/CNCs nano-hybrid membrane and iron oxide doped CNCs suspension to the mixture to obtain iron oxide doped G/PEG/CNCs composite material, pouring the dispersion into polystyrene dish, and peeling off the membrane. USE - Preparation of hierarchical nano-hybrid material. ADVANTAGE - The prepared hierarchical nano-hybrid material has thermal response, excellent mechanical properties, shape memory function, low temperature thermal deformation, shortens the deformation time than the thermal response time compared with existing methods and is economical. DETAILED DESCRIPTION - Preparation of hierarchical nano-hybrid material involves (1) hydrolyzing medical absorbent cotton with acid solution to obtain cellulose nanocrystals aqueous suspension (CNCs), mixing purified cotton and preheated acid solution under heating, diluting with deionized water to stop reaction, centrifuging the resulting mixture for certain period of time, dialyzing with water for certain period of time to completely remove residual acid, stirring the obtained CNCs suspension for certain period of time, ultrasonically processing to obtain stable suspension, (2) dissolving iron chloride hexahydrate and iron chloride tetrahydrate in the suspension of CNCs, adding ammonium hydroxide under heating, stirring to obtain iron oxide doped cellulose nanocrystals nano-hybrid membrane, (3) dispersing certain amounts of cellulose nanocrystal dispersion and polyethylene glycol (PEG) in deionized water at room temperature with strong agitation, mixing two suspensions together, stirring, adding various graphene (G) nanosheets to normal temperature suspension in controlled manner, stirring, pouring the dispersion into polystyrene dish, drying in oven, peeling off the hybrid membrane from the tray to obtain G/PEG/CNCs nano-hybrid membrane, (4) synthesizing of iron oxide doped G/PEG/CNCs nano-hybrid membrane using rare earth magnets to collect iron oxide doped CNCs nano-hybrid membrane, washing for several times with deionized water, ultrasonically treating of these nano hybrid membrane, dissolving the additives in deionized water under stirring, mixing the G/PEG/CNCs nano-hybrid membrane and iron oxide doped CNCs suspension to the mixture, ultrasonically processing to obtain iron oxide doped G/PEG/CNCs composite material, pouring the dispersion into polystyrene dish in dry oven, and peeling the hybrid membrane from the dish.