TY - JOUR T1 - Surface modification of anhydrous borax powders with stearic acid via mechanical dry powder coating AU - Akpınar, Süleyman AU - Arsoy, Zeyni AU - Şenol, R. Sena PY - 2019 DA - March Y2 - 2019 DO - 10.30728/boron.414410 JF - Journal of Boron PB - TENMAK Bor Araştırma Enstitüsü WT - DergiPark SN - 2149-9020 SP - 7 EP - 15 VL - 4 IS - 1 LA - en AB - Surface modification of anhydrous borax powders withstearic acid in the laboratory-scale planetary ball mill via mechanical drypowder coating approach was investigated.The alteration of hydrophilic surface properties of anhydrous borax with stearicacid was optimized by modifier amount and activation time. The cohesionmechanisms of powders, which processed at conditions of 0.5, 1 and 2 wt. % stearicacid amount with the function of 30, 60 and 120 minute activation time, wereevaluated in terms of the solubility test, contact angle measurements, particlesize distributions, and scanning electronmicroscopy (SEM) analysis. Results indicate that anhydrous borax surface couldbe switched from hydrophilic to hydrophobic with changing contact angle fromwetting (17o) to non-wetting (99o). Water-insoluble amount of anhydrous borax powders, as a coatingefficiency indicator, was increased from 73 % to 91 % by coating with 1 wt. % stearicacid for 60 min. Furthermore, SEM analysis results demonstrate that stearicacid was discretely coated over the anhydrousborax surface. As a conclusion, an effective mechanical dry coating processingby a one-step coating approach could beapplied to obtain a modified anhydrousborax surface, which offers controlled solubility behaviour in water-basedsuspensions. KW - Anhydrous borax KW - Stearic acid KW - Surface modification KW - Dry Coating CR - [1] McMillian P. W., Glass-Ceramics, 2nd Edition, Academic Press, New York, 1979. CR - [2] Kingery W. D., Bowen H. K., Uhlmann, D. R., Introduction to Ceramics, John Wiley and Sons, New York, 1976. CR - [3] Hawthorne F. C., Burns P. 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