Effect of crystallinity and surface silanol groups on rheological properties of different sepiolites

• Autorzy: Çınar Mustafa , Gülgönül Ilhan , Ozdemir Orhan , Çelik Mehmet S.

Identyfikatory

DOI

10.37190/ppmp/153947

• Języki publikacji: EN

Abstrakty

EN

In this study, differences in the rheological properties of three different types of brown sepiolites (K1, K2, and K3) along with one beige (B) sepiolite with different physicochemical properties were explained based on their crystallinity and level of surface silanol groups. Towards this aim, SEM images, XRD and chemical analyses, cation exchange capacity (CEC), and water absorption tests were conducted along with surface area measurements and time-dependent pH profiles. The pH profiles at 3% by wt. revealed that each sepiolite sample attained the equilibrium at different times. These differences showed a parallel behavior with the degree of crystallinity. While sepiolite with better crystallinity (K1) was rather slow in reaching the equilibrium pH, the sepiolites with poor crystallinity (B and K3) reached their equilibrium pH more quickly. The rheological studies conducted with different sepiolites at 3% solids concentration exhibited time-dependent flow of the Bingham plastic model and thixotropic. Differences observed in the rheological behavior of sepiolites were found to correlate with the fiber size, CEC, surface area, and water absorption. The results further indicated that sepiolites with low crystallinity or high level of surface silanol groups (K3 and B sepiolites) show the best rheological properties.

Słowa kluczowe

EN

sepiolite; rheology; crystallinity; pH

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Physicochemical Problems of Mineral Processing
• Rocznik: 2022
• Tom: Vol. 58, iss. 5
• Strony: art. no. 153947
• Opis fizyczny: Bibliogr. 51 poz., rys., tab., wykr.

Twórcy

autor

Çınar Mustafa

• Çanakkale Onsekiz Mart University, Mining Engineering Department, 17400, Canakkale, Turkey

autor

Gülgönül Ilhan

• Balikesir University, Mining Department, Balikesir, Turkey

autor

Ozdemir Orhan

• Istanbul University-Cerrahpasa, Mining Engineering Department, 34500, Buyukcekmece, Istanbul, Turkey

• https://orcid.org/0000-0002-4408-546X

autor

Çelik Mehmet S.

• Istanbul Technical University, Mineral Processing Engineering Department, 34469, Maslak, Istanbul, Turkey
• Harran University, Rectorate, Şanlıurfa, Turkey

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).