Dynamic interfacial tension and adsorption kinetics of nonionic surfactants during microfluidic droplet formation process

The effect of aromatic side chains on the dilational rheological properties of N-acyltaurate amphiphiles at water–decane interfaces

“…5 Therefore, exploring the rules affecting the nature of interfaces, especially the interfacial adsorption layers formed by surfactants, has attracted extensive attention. [6][7][8] The interfacial dilational rheological technique is a sensitive approach to studying the properties of different fluid interfaces. [9][10][11] By disturbing the fluid interfaces, interfacial rheological techniques can be used to obtain quantitative information about the interfacial films formed by surfactant molecules.…”

Adsorption Kinetics of Biosurfactant Surfactin at the n-Hexadecane/Aqueous Solution Interface

“…Microfluidics as a continuously developing technique is powerful for generating droplets on a small-size scale (nm to μm) and creates a flow condition in microchannels, which makes it possible to study the absolute kinetic constants of surfactant adsorption–desorption. , Recently, kinetic-controlled adsorption of a classical nonionic surfactant and a small ionic surfactant at the n -octane/aqueous solution interface were performed using a differential pressure-based microfluidic method, and the adsorption rate constants were determined based on the dynamic interfacial tension. Furthermore, droplet-based microfluidics has been proposed to analyze the adsorption kinetics of carboxylic acid surfactant by means of pH variation in a pure kinetic-limited adsorption regime, and the adsorption rates and the interface coverage were obtained, which were applied to illustrate the emulsion stability from the aspect of droplet coalescence …”

Controllable Inducing Preparation of Polymorphous Hundred-Micron Alumina Microspheres via Droplet-Based Two-Stage Microfluidic Solvent Extraction Technology

“…45−49 Generally, in a microfluidic chip, the controllability of the flow field is considerably enhanced, making it possible to operate the droplet mass transfer and gel processes based on the flow field. 50,51 The characteristics of the microfluidic precision operation can be leveraged to regulate the contact between the extractant and sol droplets in the microchannel and the direction of extraction diffusion. Combining the microfluidic technology with the extraction and solidification technologies of the sol−gel process can significantly expand the application scope of these processes.…”

“…Simultaneously, based on microdroplet technology, the combination of a liquid dispensing into individual droplets followed by drop coalescence further refines the operation of sol droplets, effectively avoiding any blockages caused by sediments or viscous gels . Various inorganic microspheres, such as alumina, silica, zirconia, and polymethylsilsesquioxane (PSQ) microspheres, with highly controllable morphologies have been successfully prepared using microfluidic systems owing to the advantage of precise control of liquid drops in such systems. − Generally, in a microfluidic chip, the controllability of the flow field is considerably enhanced, making it possible to operate the droplet mass transfer and gel processes based on the flow field. , The characteristics of the microfluidic precision operation can be leveraged to regulate the contact between the extractant and sol droplets in the microchannel and the direction of extraction diffusion. Combining the microfluidic technology with the extraction and solidification technologies of the sol–gel process can significantly expand the application scope of these processes.…”