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| 1 | 改性SiO_2纳米颗粒沸腾沉积层的形成原理及其沸腾换热显示文摘实验研究了改性SiO_2纳米流体液滴蒸发后的沉积图案,以及改性SiO_2纳米颗粒沸腾沉积层对沸腾换热的影响。液滴蒸发实验研究表明:改性官能团会影响改性SiO_2纳米颗粒是否吸附在液-气界面,从而推断出在沸腾过程中改性官能团对纳米颗粒沉积方式的影响。沸腾实验研究结果表明:用聚乙二醇基团改性的SiO_2纳米颗粒沸腾沉积层使加热面的平均粗糙度从160 nm大幅增长到977 nm,且能增强纯水的沸腾传热系数;而用磺酸基团改性的SiO_2纳米颗粒沸腾沉积层对加热面的平均粗糙度的改变不明显,只使其增大了60 nm,且恶化了纯水的沸腾传热系数。通过沸腾换热实验结果较好地验证了通过液滴蒸发实验推断出的沸腾过程中改性官能团对纳米颗粒沉积方式的影响。 | 王东民 董丽宁 全晓军 | 2018 | 化工学报2018，69，10： | 3 |
| 2 | Formation of wavy-ring crack in drying droplet of protein solutions显示文摘The formations of desiccation cracks and their patterns in drying droplets of protein solutions are studied experimentally. The solvent evaporation causes the dehydration self-organization phenomenon in colloidal droplets, followed by the formations of desiccation cracks. Two categories of highly ordered crack patterns, which we name 'daisy' and 'wavy-ring', are identified in the drying droplets. We explore the shifting of crack patterns from the 'daisy' to the 'wavy-ring' by varying the concentration of protein droplets. The results show that the concentration correlates with the pattern of deposition film directly, and modulates the periodicity of the crack pattern. We investigate the formations and periodicities of these two kinds of crack patterns, and obtain the scaling law of periodicity of the 'wavy-ring' crack pattern. The relationship between the deposition pattern and the highly ordered crack patterns is also examined. This study will help in understanding the formation mechanisms of crack patterns in drying droplets of protein solutions and assist the future design of crack patterns in practical applications. | GAO MengNi HUANG XianFu ZHAO YaPu | 2018 | Science China(Technological Sciences)2018，61，7： | 2 |
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