sonochemical synthesis of ca(oh)2 nanoparticles and its application in preparation of mwcnt-paraloid nanocomposite

in this work at the first step calcium hydroxide nano-particles were synthesized via sono-chemical method at room temperature. at the second step aminated multi-walled carbon nano-tubes was prepared via chemical modification of surfaces of cnt. finally modified-mwcnt and ca(oh)2 were added to paraloid matrix by aid of ultrasonic irradiation. paraloid-modified-mwcnt-ca(oh)2 nanocomposite was used as a protection agent applicable in cultural heritage preservation. this nanocomposite can be used against acid rain that is destructive agent in historic monuments. one of the main advantages of paraloid as a consolidant is that it is stronger and harder than polyvinyl acetate without being extremely brittle. nanostructures were characterized by x-ray diffraction (xrd) and scanning electron microscopy (sem). thermal stability behavior of paraloid filled with calcium hydroxide was investigated by thermogravimetric analysis (tga). our results show that the mwcnt-ca(oh)2 nanostructure can enhance thermal stability property of the paraloid matrix. nano-additives like a barrier slow down volatilization of paraloid chains against heat.