Mechanism of stearic acid adsorption to calcite
Samo za registrovane korisnike
2013
Članak u časopisu (Objavljena verzija)

Metapodaci
Prikaz svih podataka o dokumentuApstrakt
This paper presents the interpretation of binding mechanism of stearic acid for calcite surface in two modification methods. In the "dry" method, a surface dissociation of stearic acid is assumed where H+ ion goes to a surface carbonate ion and stearic ion is chemisorbed on primary surface center of -Ca+ ion which is only available for chemisorption. The structure of adsorbed layer indicates chemisorption of stearate, but due to steric effects, and the oblique or gauche conformation of hydrocarbon chains. A part of surface -Ca+ centers can be blocked, which is explained by the result that physical adsorption dominates over 1.5%. In the "wet" method, by adding stearic acid, at concentration above the critical concentration of micelle formation in base solution, micelles are formed, and on the other side free stearic acid molecules or molecules from developed micelle dissociate. The resulting stearic ions can be chemisorbed on primary centers of -Ca+ ions or participate in ion exchange w...ith OH- ions from secondary surface centers. With increasing adsorption density, the adsorbed ions and molecules, due to interactions of hydrocarbon chains, and thickness of double electrical layer, achieve a vertical orientation and keep the trans-conformation of hydrocarbon chains.
Ključne reči:
Stearic acid / Calcite / Adsorption / "Wet method" / "Dry method"Izvor:
Powder Technology, 2013, 245, 208-216Izdavač:
- Elsevier, Amsterdam
Finansiranje / projekti:
- Osvajanje tehnoloških postupaka dobijanja ekoloških materijala na bazi nemetaličnih mineralnih sirovina (RS-34013)
- Mehanohemijski tretman nedovoljno kvalitetnih mineralnih sirovina (RS-34006)
DOI: 10.1016/j.powtec.2013.04.041
ISSN: 0032-5910
WoS: 000322936300026
Scopus: 2-s2.0-84878119014
Institucija/grupa
Institut za tehnologiju nuklearnih i drugih mineralnih sirovinaTY - JOUR AU - Mihajlović, Slavica AU - Vučinić, Dušica AU - Sekulić, Živko AU - Milićević, Sonja AU - Kolonja, Božo M. PY - 2013 UR - https://ritnms.itnms.ac.rs/handle/123456789/257 AB - This paper presents the interpretation of binding mechanism of stearic acid for calcite surface in two modification methods. In the "dry" method, a surface dissociation of stearic acid is assumed where H+ ion goes to a surface carbonate ion and stearic ion is chemisorbed on primary surface center of -Ca+ ion which is only available for chemisorption. The structure of adsorbed layer indicates chemisorption of stearate, but due to steric effects, and the oblique or gauche conformation of hydrocarbon chains. A part of surface -Ca+ centers can be blocked, which is explained by the result that physical adsorption dominates over 1.5%. In the "wet" method, by adding stearic acid, at concentration above the critical concentration of micelle formation in base solution, micelles are formed, and on the other side free stearic acid molecules or molecules from developed micelle dissociate. The resulting stearic ions can be chemisorbed on primary centers of -Ca+ ions or participate in ion exchange with OH- ions from secondary surface centers. With increasing adsorption density, the adsorbed ions and molecules, due to interactions of hydrocarbon chains, and thickness of double electrical layer, achieve a vertical orientation and keep the trans-conformation of hydrocarbon chains. PB - Elsevier, Amsterdam T2 - Powder Technology T1 - Mechanism of stearic acid adsorption to calcite EP - 216 SP - 208 VL - 245 DO - 10.1016/j.powtec.2013.04.041 UR - conv_661 ER -
@article{ author = "Mihajlović, Slavica and Vučinić, Dušica and Sekulić, Živko and Milićević, Sonja and Kolonja, Božo M.", year = "2013", abstract = "This paper presents the interpretation of binding mechanism of stearic acid for calcite surface in two modification methods. In the "dry" method, a surface dissociation of stearic acid is assumed where H+ ion goes to a surface carbonate ion and stearic ion is chemisorbed on primary surface center of -Ca+ ion which is only available for chemisorption. The structure of adsorbed layer indicates chemisorption of stearate, but due to steric effects, and the oblique or gauche conformation of hydrocarbon chains. A part of surface -Ca+ centers can be blocked, which is explained by the result that physical adsorption dominates over 1.5%. In the "wet" method, by adding stearic acid, at concentration above the critical concentration of micelle formation in base solution, micelles are formed, and on the other side free stearic acid molecules or molecules from developed micelle dissociate. The resulting stearic ions can be chemisorbed on primary centers of -Ca+ ions or participate in ion exchange with OH- ions from secondary surface centers. With increasing adsorption density, the adsorbed ions and molecules, due to interactions of hydrocarbon chains, and thickness of double electrical layer, achieve a vertical orientation and keep the trans-conformation of hydrocarbon chains.", publisher = "Elsevier, Amsterdam", journal = "Powder Technology", title = "Mechanism of stearic acid adsorption to calcite", pages = "216-208", volume = "245", doi = "10.1016/j.powtec.2013.04.041", url = "conv_661" }
Mihajlović, S., Vučinić, D., Sekulić, Ž., Milićević, S.,& Kolonja, B. M.. (2013). Mechanism of stearic acid adsorption to calcite. in Powder Technology Elsevier, Amsterdam., 245, 208-216. https://doi.org/10.1016/j.powtec.2013.04.041 conv_661
Mihajlović S, Vučinić D, Sekulić Ž, Milićević S, Kolonja BM. Mechanism of stearic acid adsorption to calcite. in Powder Technology. 2013;245:208-216. doi:10.1016/j.powtec.2013.04.041 conv_661 .
Mihajlović, Slavica, Vučinić, Dušica, Sekulić, Živko, Milićević, Sonja, Kolonja, Božo M., "Mechanism of stearic acid adsorption to calcite" in Powder Technology, 245 (2013):208-216, https://doi.org/10.1016/j.powtec.2013.04.041 ., conv_661 .