The Preparation Of Large Size Ordered Porous PS Hollow Spheres

Porous hollow PS spheres are basic functional materials,widely used in many areas due to their hollow core/porous shell structures.The large-size porous hollow PS spheres have an important application in laser fusion field.While as inertial confinement fusion(ICF)targets,the performance and experiments have also been restricted owing to the poor structural controllability,irregular pore sized distribution and polydispersity.In the paper,the hydrophobic SiO2 microspheres were used as template particles,and the three-dimensionally ordered porous PS hollow spheres were prepared and researched based on colloidal particle template method and microfluidic technology.200 nm-800 nm single dispersed hydrophobic SiO2 microspheres were prepared via sol gel method,vacuum freeze drying technology and ethanol supercritical technology.PS/SiO2 block materials and porous PS balls were prepared by using the bottom up method.Curing temperature,SiO2 template particle size,SiO2 microsphere and PS mass ratio,droplet size and shell structure on the structure of porous PS hole structure were investigated.The research results are listed as follows:(1)The size of the SiO2 microspheres initially increased and then decreased as the volume of double addition of TEOS increasing.Alkyl groups were successfully grafted on the surface of SiO2 microsphere by supercritical ethanol treatment,and exhibited excellent hydrophobic properties and high contact angle about 1490.The smaller size of SiO2 microspheres displays better hydrophobic properties on the same conditions.Over 12 g SiO2 microsphere can be processed once via our method,and the contact angle of the handled SiO2 microsphere is all about140°,meeting well with our experiments.(2)The size of the droplets decreases with the enlargement of Qc and increases with the increase of Qd.Solidification at the lower temperature can order the SiO2 microsphere neatly,and make the structure ordered,while Solidification at the higher temperature has an awful impact on the self-assembling of the SiO2 microsphere.Thus the optimal solidification temperature is 20 ℃.The microspheres with a smaller size in the range of 200nm-800nm help for the self-assembling and form the continuous and ordered structure of the SiO2 microsphere.The size of the droplets has no obvious influence on the regularity of the structure of PS spheres.Moreover,the mass ratio equaling to 4.74:6.34 of PS and SiO2 microspheres is in favor of the formation of the ordered structure.In our essay,the hydrophobic SiO2 microspheres were used as template particles and PS was implemented as the framework.And the large size,ordered and cellular PS spheres were successfully prepared with an external diameter of 860 μm and a wall thickness of 195 μm.The prepared PS spheres have excellent hydrogen storage propertie...