气泡液膜界面法制备纳米级碳酸氢钠

采用气泡液膜界面法制备了纳米级碳酸氢钠NaHCO_3粒子。通过单一变量法实验确定,当将100mL蒸馏水、10gNaHCO_3、12g纳米SiO_2、6mL增稠剂和8mL发泡剂混匀,并通过搅拌,可制备出优质的纳米级NaHCO_3。在制备的大量高质量气泡液膜中,不仅NaHCO_3溶于该薄液膜中,且液膜内还有大量更小的气泡。将该薄液膜干燥时,NaHCO_3在气泡液膜界面上结晶析出,液膜中间的气泡阻碍了NaHCO_3粒子的长大,因此很容易获得小粒径的粒子。微观分析结果表明,制备的NaHCO_3粒子为宽约80nm、长约280nm的片状,明显小于市售NaHCO_3粒子尺寸的5~100m。

Preparation of Nano-Sized Sodium Bicarbonate Utilizing Bubble Liquid Membrane Interfaces

Nano-sized sodium bicarbonate (NaHCO3) will be prepared by utilizing the method of bubble liquid membrane interfaces. Nano-sized sodium bicarbonate (NaHCO3) of high quality will be successfully produced with 100 mL distilled water, 10 g NaHCO3, 12 g nano-SiO2, 6 mL thickener and 8 mL foaming agent blended evenly and mixed together. NaHCO3 is soluble in the high-quality prepared bubble liquid membranes, where more smaller bubbles are formed in large quantity. The separation by crystallization of NaHCO3 is achieved at the interface of drying thin liquid membranes. The smaller bubbles between the liquid membranes hinder the growth of NaHCO3, thus making it easy to obtain particles of even smaller sizes. The microscopic analysis results show that the prepared NaHCO3 particles, 80 nm in width and 280 nm in length, are much smaller than those commercial NaHCO3 particles of 5 to 100 m in size.