改性二氧化硅纳米粒子提升泡沫稳定性研究

Enhancement of Foam Stability with Modified Silica Nanoparticles

利用3-氨基丙基三乙氧基硅烷(APTES)对SiO_(2)纳米粒子进行改性,得到改性SiO_(2)纳米粒子,通过FTIR和接触角分析对其进行了表征,并通过静态实验考察了十二烷基硫酸钠(SDS)溶液、SiO_(2)-SDS纳米流体、改性SiO_(2)-SDS纳米流体在有、无氯化镁存在下对CO_(2)泡沫的起泡性、发泡性和稳定性的影响。结果表明,经改性SiO_(2)纳米粒子表面改性的聚甲基丙烯酸甲酯(PMMA)表面在油-水体系中更亲油,在空气-水体系中更亲气;与SDS溶液(质量浓度0.236%,半衰期80 min)相比,SiO_(2)(质量浓度0.06%)-SDS纳米流体、改性SiO_(2)(质量浓度0.05%)-SDS纳米流体的泡沫半衰期均有所延长,分别延长至120 min、140 min;当SDS质量浓度从0.236%增至0.472%时,改性SiO_(2)-SDS纳米流体的泡沫半衰期从140 min延长至270 min;在氯化镁存在下,改性SiO_(2)-SDS纳米流体的泡沫半衰期可达90 min。

We modified SiO_(2) nanoparticles by using 3-aminopropyltriethoxysilane(APTES),and characterized the structure by FTIR and contact angle analyses.Moreover,we investigated the effects of sodium dodecyl sulfate(SDS)solution,SiO_(2)-SDS nanofluid,and modified SiO_(2)-SDS nanofluid on the foamability,foaming performance,and stability of foam in the presence or absence of magnesium chloride by static experiments.The results show that the surface of polymethyl methacrylate(PMMA)modified by modified SiO_(2) nanoparticles is more lipophilic in oil-water system and more aerophilic in air-water system.Compared with SDS solution(mass concentration of 0.236%,half-life of 80 min),the foam half-life of SiO_(2)(mass concentration of 0.06%)-SDS nanofluid and modified SiO_(2)(mass concentration of 0.05%)-SDS nanofluid is extended to 120 min and 140 min,respectively.When the mass concentration of SDS increases from 0.236%to 0.472%,the foam half-life of modified SiO_(2)-SDS nanofluid increases from 140 min to 270 min.In the presence of magnesium chloride,the foam half-life of modified SiO_(2)-SDS nanofluid can reach 90 min.