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Abstract

An efficient, simple, surfactant-free and solvent-free green synthesis of Peracetylated-b-cyclodextrin (PAc-β-CD) nano particle by using an environmentally benign supercritical carbon dioxide (scCO2)processes. Rapid expansions of supercritical solution(RESS) processes were used to precipitate PAc-β-CD nanoparticles. The effect of the concentration (0.05-0.5 wt/wt %), nozzle type and length (5-50mm) and internal diameter (ID) (50-150 mm) of capillary on particle size and particles morphology of PAc-β-CD nanoparticle were investigated at constant pressure of 34.5 MPa and temperature of 45 ℃. The obtained PAc-β-CD particle size and morphology was measured with Scanning electron microscopy (SEM). Among all of these experimental parameters 50 mm ID with 5 mm length capillary nozzle given particles size with 40 nm and with spherical shape and same way experimental conditions of orifice nozzle obtained good average particle size distribution with 0.5 wt% of PAc-β-CD supercritical solution in CO2. The Concentration of PAc-β-CD, capillary nozzle length and ID are shown significantly affected on particles size and nozzle type significantly effect on aggregation of particles and polydispersity.