To study the surfactants adsorbed at the interface, the gold nanoparticles’ vertical movements were confined to the interfacial area by the radiation pressure of the laser beam propagating from the top to the bottom, as illustrated in Figure 1. We used gold nanoparticles as an optical probe and analyzed their trajectories on top of surfactant-covered glass surfaces. Recently, we have demonstrated the utilization of optical tweezers for single-particle tracking to investigate surfactant behaviors at water-glass interfaces ( Figure 1). The development of this trap-and-track approach can have important implications for various applications, including drug delivery and nanomaterials. Our study provides valuable insights into the behavior of surfactants at interfaces and highlights the potential of optical tweezers for surfactant research. The greater binding affinity of bromide ions to CTA+ micelle surfaces reduces the repulsion among surfactant head groups and enhances the mobility of micelles adsorbed on the interface. ![]() Our results show that counterions have a significant effect on surfactant behavior at the interface. ![]() We use optical tweezers to trap a gold nanoparticle and statistically analyze the particle’s movement in response to various surfactant concentrations, evidencing the rearrangement of surfactants adsorbed on glass surfaces. In this study, we perform trap-and-track analysis to compare the behavior of cetyltrimethylammonium bromide (CTAB) and cetyltrimethylammonium chloride (CTAC) at water–glass interfaces. ![]() Optical tweezers combined with trajectory analysis can become a powerful tool for investigating surfactant characteristics. ![]() Understanding the behavior of surfactants at interfaces is crucial for many applications in materials science and chemistry.
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