Preparation of SiO2 nanoparticles with adjustable size for fabrication of SiO2/PMHS ORMOSIL superhydrophobic surface on cellulose-based substrates

•SiO2 nanoparticle with control particle size was prepared.•Response surface methodology was applied to control the particle size.•Superhydrophobic SiO2/PMHS ORMOSIL coating was fabrication.•ORMOSIL modified wood possessed improved water-repellent and anti-fouling property.•ORMOSIL modified filter paper and cotton possessed oil/water separation ability.