纳米氢氧化铝稳定泡沫性能研究

通过原位表面活性化可使纳米颗粒变成表面活性颗粒,使其能够吸附在气-液界面上形成颗粒单层,这种颗粒单层类似于表面活性剂在气-液界面上的吸附单分子层,有起泡和稳泡的作用.研究了纳米氢氧化铝与表面活性剂SDS及OP-10复配产生的泡沫的性能.结果表明,以水为溶剂时,OP-10基本不能使纳米氢氧化铝颗粒原位表面活性化,不能在起泡和稳泡方面产生协同效应.而阴离子表面活性剂SDS能够通过静电作用吸附在纳米氢氧化铝颗粒表面,使颗粒表面覆盖一层烷基链而亲水性减弱,从而能以颗粒单层形式吸附在气-液界面上起到起泡和稳泡的作用.当SDS质量分数大于0.6%后,表面活性剂分子在颗粒表面形成双层或多层吸附,打破了活性颗粒的亲水-亲油平衡,纳米颗粒重新转变为强亲水颗粒,起泡、稳泡能力下降.质量分数0.1%纳米Al(OH)3+SDS体系的泡沫封堵性能明显优于单一SDS体系,文中实验条件下阻力因子可达100以上.

Study on the stabilizing effect of aluminum hydroxide nanoparticles on foam stabilized

Nanoparticles can be turned into surface-active particles by means of in situ surface activation.The surface-active particles can form particle individual layer in air/liquid interface,just like the absorption monomolecular layer of the surfactant,so they have the effect of foaming and stabilizing foam.The performance of foam produced with the compounded solution of aluminum hydroxide nanoparticles and surfactant SDS or OP-10 separately is studied.The results show that OP-10 can not make the aluminum hydroxide nanoparticles in situ surface-activate in aqueous media,or it has no synergistic effects in foaming and stabilizing foam.But anionic surfactant SDS can be adsorbed to the surface of the nanoparticles via electrostatic interaction,which forms a layer of hydrocarbon chain on the surface of the nanoparticles,and then the particles can be adsorbed onto the air/liquid interface in the form of single-layer to produce the effect of stabilizing foam.When the mass fraction of SDS is more than 0.6%,double-layer and multi-layer adsorption occurs on the surface of the nanoparticles,and the wetting balance is broken and the particles return to hydrophilic state and lose the ability of foaming and stabilizing foam.The SDS solution containing aluminum hydroxide nanopartiales of 0.1% and has better foam sealing effect than the SDS solution without the nanopartiales,and the resistance factor can reach above 100 under the given experimental conditions.