Influence of nanoparticles coating on paper durability

An environmentally friendly process were employed to prepare samples of recycled paper,as well as the coating solution of chitosan nanoparticles and dispersion of ca(oh)2 particles. the nanomaterial was tested for antibacterial and acidity neutralising functions to preserve the strength and colour of paper samples. the paper samples were then characterised for physical and morphological characteristics,as well as chemical and mechanical properties. at concentrations of 0.125 and 0.25 mg/l,the chitosan nanoparticles (23-62 nm) were observed to retard the propagation of e. coli and s. aureus bacteria up to 22 and 26 mm in diameter,respectively. this propagation was also hindered by an increase in acidity introduced by ca(oh)2 nanoparticles. the grammage,firmness,and colour of coated paper samples were not significantly influenced by nanoparticles concentration or coating thickness due to the low mass-to-area ratio of coating. nevertheless,the tear strengths and cracking resistance of coated paper were improved. chitosan nanoparticles in the coating potentially functioned as a sizing agent by diffusing into the pores of paper fibres and increasing the interfibrillar bonding,while the nanoparticles of ca(oh)2 apparently preserved the strength and colour of paper samples by neutralising the acidity and thus preventing microbiological attacks. © school of engineering,taylor’s university.