In situ preparation and surface modification of barium sulfate nanoparticles

详细信息    查看全文

• 作者：Hari Bala ; Wuyou Fu ; Yupeng Guo ; Jingzhe Zhao ; Yanqiu Jiang ; Xuefeng Ding ; Kaifeng Yu ; Minggang Li and Zichen Wang
• 关键词：In situ ; Barium sulfate ; Nanoparticles ; Octadecyl dihydrogen phosphate ; Hydrophobic property
• 刊名：Colloids and Surfaces A: Physicochemical and Engineering Aspects
• 出版年：2006
• 出版时间：15 February 2006
• 年：2006
• 卷：274
• 期：1-3
• 页码：71-76
• 全文大小：322 K

文摘

Hydrophobic BaSO₄ nanoparticles were successfully produced via a one-step process through precipitation reaction in aqueous solution of BaCl₂ and (NH₄)₂SO₄ with octadecyl dihydrogen phosphate (n-C₁₈H₃₇OPO₃H₂, ODP) as a modifying agent. The ODP was used to control the BaSO₄ particle size and to modify the surface property of the particles produced from the precipitation. Measurements of relative contact angle and active ratio indicated that BaSO₄ samples were hydrophobic. The samples were characterized by using field emission scanning electron microscope, transmission electron microscopy, X-ray diffraction, infrared analysis, thermogravimetric analysis and energy dispersive X-ray analysis. The results suggested that the hydrophobic property was attributed to presence of a thin layer of barium alkyl phosphates, which was formed and coated onto the surface of BaSO₄ particles during the reaction process. The thin films at the surface of the BaSO₄ modified the surface property and control the particle size and morphology.