Abstract Nanoparticles/surfactant interplays can robustly manipulate interfacial properties, while it is still unclear how their interactions affect interface behavior. This research recap unprecedented research for determination of dynamics of adsorption and dynamic surface properties of amphiphilic sheet-like nanoparticles in anionic surfactant mixtures and generalizing their characteristics in industrial and macroscopic applications by controlling microscopic active mechanism, particularly tuning foam properties and controlling its behavior. Amphiphilic nanosheets are surface-active particles which tend to self-assemble at the air-water interface. In this study, a system of an anionic surfactant (sodium dodecylsulfate (SDS)) and an amphiphilic nanoparticle (Graphene oxide (GO)) is studied at different ratios. It appears that there is a critical value for the minimum number of surfactants per nanosheets (> 160) to make the amphiphilic nanoparticle more hydrophilic. The results set out that below this critical ratio, the amphiphilic nanoparticles are partially hydrophobic and they are surface-active enough to be adsorbed considerably at the air-water interface. The nanoparticle adsorption causes an increase in surface elasticity and a decrease in surface tension (ST). As SDS/GO ratio increases, GO particles are heavily surrounded by SDS molecules rendering them hydrophilic particles. The hydrophilic GO particles start traveling back into the bulk, drastically decreasing elasticity and increasing the ST. When SDS concentration approaches the pure SDS critical micelle concentration (CMC), there appears that some of GO/SDS complexes are still on the air-water interface to slow down the dynamics of ST. The presence of GO/SDS complexes at the interface also decreases ST to lower values compared to the pure SDS near the CMC. The hydrophilic transition of GO nanoparticles is also confirmed by ζ potential and DLS measurements. This suggests a simple way to tune foam properties and behavior by selecting proper nanoparticle/surfactant ratio.

中文翻译：

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使用动态张力测定法通过改变两亲纳米片/阴离子表面活性剂比率来改变界面行为

摘要 纳米粒子/表面活性剂的相互作用可以有效地操纵界面特性，但目前尚不清楚它们的相互作用如何影响界面行为。这项研究回顾了前所未有的研究，用于测定阴离子表面活性剂混合物中两亲性片状纳米粒子的吸附动力学和动态表面性质，并通过控制微观活性机制，特别是调整泡沫性质和控制其行为，概括它们在工业和宏观应用中的特性。两亲性纳米片是表面活性颗粒，倾向于在空气-水界面自组装。在这项研究中，研究了阴离子表面活性剂（十二烷基硫酸钠（SDS））和两亲纳米颗粒（氧化石墨烯（GO））在不同比例下的系统。似乎每个纳米片的最小表面活性剂数量 (> 160) 存在一个临界值，以使两亲性纳米颗粒更具亲水性。结果表明，低于该临界比率，两亲性纳米粒子部分疏水，并且它们的表面活性足以在空气-水界面处被大量吸附。纳米颗粒吸附导致表面弹性增加和表面张力 (ST) 降低。随着 SDS/GO 比率的增加，GO 颗粒被 SDS 分子严重包围，使它们成为亲水性颗粒。亲水性 GO 颗粒开始返回本体，显着降低弹性并增加 ST。当 SDS 浓度接近纯 SDS 临界胶束浓度 (CMC) 时，似乎一些 GO/SDS 复合物仍在气水界面上以减慢 ST 的动力学。与 CMC 附近的纯 SDS 相比，界面处 GO/SDS 复合物的存在也将 ST 降低到较低的值。ζ 电位和 DLS 测量也证实了 GO 纳米粒子的亲水转变。这提出了一种通过选择合适的纳米颗粒/表面活性剂比率来调整泡沫特性和行为的简单方法。