In this study, an asymmetric nano-hydroxyapatite/chitosan (n-HA/CS) composite GBR membrane was fabricated by means of solution-blending and solvent-evaporating in vacuum. 
solution-blending
In this study, an asymmetric nano-hydroxyapatite/chitosan (n-HA/CS) composite GBR membrane was fabricated by means of solution-blending and solvent-evaporating in vacuum. 
solvent-evaporating
The membranes were characterized using SEM, XPS and contact angle. 
SEM
The membranes were characterized using SEM, XPS and contact angle. 
XPS