Nonpolar Surface Modification Using Fatty Acids and Its Effect on Calcite from Mineral Carbonation of Desulfurized Gypsum

Abstract

CaCO 3 is often used as an additive in many industries. However, additional functions are required to expand its applicability. This entails modification of its physicochemical properties. Accordingly, in this study, a particle surface modification treatment was performed on CaCO 3 produced from desulfurized gypsum for a range of industrial applications. In the experiment, fatty acids were used to modify the CaCO 3 surface, and the scale of the modification effect was based on the degree of change associated with a polar surface taking on nonpolar surface properties. In the preliminary modification experiment, stearic acid was dissolved in 2-propanol or chloroform, and the extent of the reaction and the active ratio were measured according to the stearic acid concentration. The results showed that the effective active ratio, considering the activity to unit adsorption, was higher in 2-propanol than in chloroform. Consequently, the modification solvent used in the experiment changed the CaCO 3 surface from a hydrophilic, polarized form to a hydrophobic, nonpolarized form. These results will also allow the CaCO 3 produced to be used as a filler in a range of chemical industries.

Calcium carbonate: controlled synthesis, surface functionalization, and nanostructured materials

“…The ball milling technique not only reduces the size of the CaCO 3 NPs via mechanical force, but also enhances the chemical activity for the attachment of modifiers to their surface. 206,207 Dry ball milling and wet ball milling have been used for the surface modification of CaCO 3 NPs. Dry ball milling requires high energy consumption and a long milling time, while wet ball milling requires relatively low intensity.…”

Corrosion-Resistant Hydrophobic Thermal Barrier Composite Coating on Metal Strip: A New Dimension to Steel Strips for Roofing Segment

“…The silica coating on sHMS increases the surface roughness (Figure e) and thus the hydrophobicity of the coating . Surface energies for epoxy composite coatings with mixed fillers such as aHMS–sMO and sHMS–sMO were 21.44 and 20.12 mN/m, respectively, which are within the range for conventional epoxy coatings containing an SA-modified filler. , …”

“…28 Surface energies for epoxy composite coatings with mixed fillers such as aHMS−sMO and sHMS−sMO were 21.44 and 20.12 mN/m, respectively, which are within the range for conventional epoxy coatings containing an SA-modified filler. 29,30 3.2. Thermal Insulation Performance of the Coating.…”

Green Nanofabrication Opportunities in the Semiconductor Industry: A Life Cycle Perspective

“…Fatty acids do not have polar functional groups throughout their structure, but they possess end carboxylic acid groups and, as such, can be adapted for blocking surfaces when patterning metals. Stearic acid, oleic acids and various others have already been used as surface coatings mainly for nanoparticle stabilisation, however due to their inherent hydrophobic nature, we propose their application to ASD for surface blocking [76,77]. Stearyl and lauryl acrylate were utilised by Wang et al to design a bio-based block copolymer with styrene moieties as a more sustainable thermoplastic [78].…”