This work presents the results of obtaining the sulfur nanoparticles, which can be used in agriculture as a fungicide. Sulfur nanoparticles were obtained by modifying the surface of sulfur using various surfactants including cetyltriammoniumbromide (CTAB), sodium dodecylbenzene sulfanate (SDBS) and Triton X-100 (TX-100). The size, crystal structure and morphology of sulfur nanoparticles were determined by methods as laser size analyzing (LSA), X-ray diffraction (XRD), scanning electron microscope (SEM). It was found that the nanoparticles had a sulfur monoclinic β-form struture, and their average size was in the range of 1000-1500 nm.
3-(Trimethoxysilyl)propyl methacrylate (TPM) hydrolyzes via the alkoxy groups attached to silicon when it comes into contact with an aqueous phase and forms surface active 3-(trihydroxysilyl)propyl methacylate (THPM) molecules. Their formation and adsorption at the water/air interface, i.e. decrease in the surface tension, can be used as a sensor to follow the hydrolysis process and can help to explain the role of these molecules in the emulsion formation and stabilization process. The target of this contribution is to demonstrate the experimental details of a surface tension sensor using a bubble profile analysis tensiometer for monitoring the chemical reaction of TPM with water and to explain the peculiarities observed in the measured signal, i.e. irregularities in the dynamic surface tension. Auto-oscillations of the surface tension were observed during the measurements, which are connected to a complex of different types of flows in the volume of the aqueous phase. The kinetics of the reaction and hence of the surface tension can be controlled by changing the pH of the aqueous phase. It is also possible to prevent auto-oscillations by means of a continuous gentle stirring of the aqueous phase, which then allows a quantitative monitoring of the rate of the TPM/water reaction.
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