气泡液膜界面法制备纳米级碳酸氢钠

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

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。

Nano-sized sodium bicarbonate（NaHCO_3） will be prepared by utilizing the method of bubble liquid membrane interfaces. Nano-sized sodium bicarbonate（NaHCO_3） of high quality will be successfully produced with 100 m L distilled water, 10 g NaHCO_3, 12 g nano-SiO_2, 6 m L thickener and 8 m L foaming agent blended evenly and mixed together.NaHCO_3 is soluble in the high-quality prepared bubble liquid membranes, where more smaller bubbles are formed in large quantity. The separation by crystallization of NaHCO_3 is achieved at the interface of drying thin liquid membranes. The smaller bubbles between the liquid membranes hinder the growth of NaHCO_3, thus making it easy to obtain particles of even smaller sizes. The microscopic analysis results show that the prepared NaHCO_3 particles, 80 nm in width and 280 nm in length, are much smaller than those commercial NaHCO_3 particles of 5 to 100 m in size.