Langmuir最新文献

Single drop generation in a nonconfined system during the dripping regime is studied to evaluate the effect of operating conditions on the formation time and drop size. The drop itself is composed of a water-in-oil emulsion that rises from a nozzle into a stationary aqueous phase. This emulsion is non-Newtonian and undergoes shear-thinning behavior, leading to an important decrease in viscosity upon exposure to shear forces. Its viscosity and shear-thinning level depend on the inner water fraction besides the oil viscosity. The viscosity appears to affect both the formation and detachment stages as opposed to what was reported in the previous literature. The theoretical volume of the detached drop is calculated based on the equilibrium of the forces acting upon the attached drop, in addition to the volume added in the second stage while considering the fraction of the residual drop left attached to the capillary after detachment. This model allowed for the prediction of the dynamic interfacial tension by minimizing the error between the theoretical and the experimental drop volumes.

Pickering particles can self-assemble to form a rigid barrier film at the oil-water interface, effectively inhibiting droplet aggregation and stabilizing the emulsion. This essay explores the potential of Zein/TOCNF (TEMPO-oxidized cellulose nanofiber) complex aqueous dispersion as an environmentally friendly, nontoxic, versatile, and inexpensive cleaning agent based on the Pickering effect. The Zein/TOCNF complex exhibited an improvement in its surface hydrophobicity compared to that of pure TOCNF, so that it could be used as Pickering emulsion stabilizers. The Zein/TOCNF complex has better washing ability than the washing powder for the removal of the dirt from the cotton cloth, the glass, the stainless steel, the ceramic, and the plastic sheet. In addition, residual amounts of Zein/TOCNF complexes on the fabric were insignificant. Moreover, research results have shown that Zein/TOCNF complexes are feasible as a secure, cost-effective, and sustainable alternative to commercial washing cleaners.

In the splitting photovoltaic/thermal hybrid system, splitting nanofluids with dynamic optical regulation abilities enables flexible thermal/electrical output. In the present work, the optical regulation ability of precious metal Ag nanofluids was investigated experimentally. Three types of nanoparticles, including Ag, Ag coated with SiO₂(Ag@SiO₂), and ITO nanoparticles were prepared. Six methods, meanwhile, were employed for regulating the optical characteristics of Ag nanofluids, which included temperature, concentration, type of base solution, CoSO₄, mixed nanofluids, and the core-shell structure. The results indicate that the wide-tuning of transmittance is achieved by concentration (52.2%-43.4%) of CoSO₄ (49.5% to 42.5%). It is possible to simultaneously regulate the absorption of the solar spectrum band based on the mixed nanofluid. The type of base solution and the core-shell structure enable a red shift in the absorption peak from 445 to 475 nm. On the other hand, temperature allows for fine-tuning of transmittance, demonstrating high stability of Ag/ethylene glycol. The study achieved controlled regulation of the spectral properties of Ag nanofluids within the solar spectrum region, laying the experimental foundation for their application.