Surface free energy of sulfur—Revisited

Growth kinetics of sulfur nanoparticles in aqueous surfactant solutions

“…The value of the bulk diffusivity of sulfur was calculated from Stokes-Einstein equation and that value used for the surface energy calculation of sulfur. The surface energy of the sulfur is 31.80 mJ/m 2 calculated from our experimental data, the value is very close to the available literature value for sulfur crystallized in air is 31-35 mJ/m 2 [25]. If sulfur is deposited on a surface, the surface energy also depends on the surface on which it is crystallized.…”

“…If sulfur is deposited on a surface, the surface energy also depends on the surface on which it is crystallized. The surface energy of the same orthorhombic sulfur on gold plate is 42 mJ/m 2 [25]; and a wide range of values (20-50 mJ/m 2 ) are reported when deposited on glass surface [26]. To verify our calculated value independently, we deposited sulfur particles on the glass surface after the synthesis and surface energy was measured by contact angle measurement method.…”

Surface free energy of polypropylene and polycarbonate solidifying at different solid surfaces

“…In our previous papers [4,5] we found changes in sulfur surface free energy due to temperature up to which melted sulfur was heated (yellow or orange sulfur) or different solid surfaces next to which the melted sulfur crystallized. The apparent surface free energy determined from water contact angle hysteresis for sulfur crystallized in air varied from 31.5 and 34.5 mJ/m 2 , yellow and orange sample respectively, to 39.6 and 45.9 mJ/m 2 of yellow and orange samples, respectively, when it crystallized next to silicon surface [5].…”

“…The apparent surface free energy determined from water contact angle hysteresis for sulfur crystallized in air varied from 31.5 and 34.5 mJ/m 2 , yellow and orange sample respectively, to 39.6 and 45.9 mJ/m 2 of yellow and orange samples, respectively, when it crystallized next to silicon surface [5].…”

Development of a predictive model for choosing cure agents for elastomer blends

“…It is worth noting that most of these additive molecules are polar, while sulfur has a negligible polar character, so a correct selection of elastomers and cure agents is fundamental, but even so sometimes a compatibilizing agent is necessary. The present study will show that the solubility of the evaluated cure agents in different elastomers is different and is related to their HSP.…”