浓度对薄凹液层胶体悬浮液干燥花样形成的影响  

Effect of concentration on the pattern formation of thin concave layer colloidal suspension

作　　者：马文杰[1] 王育人[2] 蓝鼎[2] 

机构地区：[1]东北电力大学理学院,吉林132012 [2]中国科学院力学研究所国家微重力实验室,北京100190

出　　处：《科学通报》2011年第17期1349-1353,共5页Chinese Science Bulletin

基　　金：东北电力大学博士科研启动基金资助项目(BSJXM-200913)

摘　　要：研究了不同浓度下厚度较薄的凹液层胶体悬浮液干燥过程及花样,利用照相机实时拍摄不同浓度下胶体悬浮液的干燥过程.结果表明随着浓度的增加,最终干燥花样圆环宽度增加,而数目明显减少;干燥过程分为5阶段,其中包含两阶段马兰哥尼对流;对流能够影响悬浮液内胶体颗粒的自组装和薄膜形貌,第一阶段对流导致薄膜边缘厚、中心薄,第二阶段对流伴随接触线的钉轧-滑移运动,导致多重宽环花样形成.We study the effect of concentration on the drying process and pattern formation of thin concave layer colloidal suspension.Camera is used to capture the drying process.It is shown that with the increase of concentration,the width of broad-ring increases,and the number of the broad-ring decreases.The drying process is divided into five stages,which contain two stages of Marangoni convections.The convection has great influence on the self-organization of colloid particles and film pattern.Pattern formation with the characteristic of thick edge and thin center is mainly caused by the first stage of convection,and multiple broad-ring pattern formation is under the influence of the second stage of convection,which accompanies pin-slip motion of contact line.

关 键 词：胶体悬浮液 马兰哥尼对流 宽环花样 

分 类 号：O415.3[理学—理论物理]