Electron micrograph of calcium silica micro-sphere

Mono-dispersed micro-sphere of silica indispensable for HPLC and other packing materials can be prepared by combinating a membrane emulsification technique with interfacial reaction used for the preparation method of inorganic micro-sphere.

 

Item	Primary emulsification	Secondary emulsification
Water phase	4mol/L Na–silicate solution	(NH4)2CO3 solution
Oil phase	Cyclohexane/n-Hexane=4/1 containing 2wt%of Tween 85	W/O emulsion prepared in the primary process
SPG membrane	Hydrophilic Dm=0.7mm	Hydrophobic Dm=3.16mm
P & Temp	180kpa    RT	50kpa       RT

 

 

Electron micrograph of calcium silica micro-sphere