纳米流体液膜蒸发自组装双尺度沉积结构三维模拟

高超; 袁俊杰; 曹进军; 杨荟楠; 单彦广

doi:10.7498/aps.68.20190270

摘要

纳米流体液膜在自然状态下蒸发干燥后除了形成单一尺度的网状连续结构、枝状分形结构以及微尺寸环结构等沉积结构, 还会形成双尺度细胞网络沉积结构和双尺度纳米粒子环状沉积结构. 为了更直观地研究纳米流体液膜双尺度沉积结构的形成机理, 本文在二维动力学蒙特卡罗模型的基础上, 建立了三维动力学蒙特卡罗模型, 并加入了耦合溶剂蒸发率的动态化学势, 成功模拟出了双尺度细胞网络沉积结构和双尺度纳米粒子环状沉积结构, 并讨论了动态化学势中化学势锐度与流体临界蒸发率对纳米流体液膜蒸发自组装双尺度沉积结构的影响. 模拟结果与文献中的实验结果吻合良好.

关键词:

Abstract

Self-assembly of nanomaterials from the drying of nanofluid films has aroused great interest due to its applications in micro/nano fabrication, ink-jet printing, and thin film coatings. Numerical models are developed to investigate the single-scale deposition structures from the drying of nanofluid films, including network structures, continuous labyrinthine, branched structures and micro-sized rings. In the case of the actual drying of nanofluid films, dual-scale cellular networks and nano-rings are also discovered. In order to study the formation mechanism of dual-scale deposition structures, a three-dimensional kinetic Monte Carlo model is developed based on two-dimensional lattice gas model, and the dynamic chemical potential which couples solvent evaporation rate is implemented. Different dynamic chemical potentials are defined for each layer of the thin-film in the model to mimic the real evaporation situation. Considering the Brownian motion and the interaction between particles, the formation of dual-scale cellular networks and nano-rings coexisting with small scale patternis achieved via coupling the chemical potential to the solvent evaporation rate. The simulation results accord well with the results from many experimentally studied de-wetting systems. The effects of the chemical potential sharpness and critical evaporation rate of fluids on the dual-scale deposition structures are discussed. It can be found that the evaporation mode of thin-film is dominated by nucleation and growth at the initial stage. If the spinodal point is passed, the residual solvent will evaporate suddenly, and the nanoparticles do not accumulate further but directly deposit into small-scale structures, thus forming a dual-scale deposition structures at the final stage of the evaporation. The simulation results also show that the chemical potential sharpness will affect the deposition structure after the mutation in a certain range. When the chemical potential sharpness equals zero, the sedimentary structure is the same as the single-scale sedimentary structure when the constant chemical potential is applied. When the chemical potential sharpness is small, the large-scale network structure interacts closely with the small-scale network structure. With the increase of chemical potential sharpness, the large-scale deposition structure remains unchanged, while the dense small-scale network structure becomes small-scale point structure. When the chemical potential sharpness exceeds a certain large value, the effect of chemical potential sharpness on the deposition structure will gradually decrease, and finally the dual-scale deposition structure will remain unchanged. The critical evaporation rate of fluids determines the area ratio of the two kind of structures in the dual-scale deposition. With the increase of the critical evaporation rate of fluids, the area ratio of small-scale structures decreases while that of the large-scale structure increases. When critical evaporation rate increases to a certain value, the final deposition structure will evolve into a single-scale deposition structure.

Keywords:

作者及机构信息

上海理工大学能源与动力工程学院, 上海市动力工程多相流动与传热重点实验室, 上海　200093

通信作者: 单彦广, shan@usst.edu.cn

基金项目: 国家自然科学基金(批准号: 51676130)和上海市动力工程多相流动与传热重点实验室资助的课题.

Authors and contacts

Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China

Corresponding author: Shan Yan-Guang, shan@usst.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 51676130) and the Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering.

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参考文献

[1]	Asha S K, Sunitha G 2019 J. Tai. Univ. Sci. 13 155 Google Scholar
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施引文献

图 1 纳米流体液膜的物理模型图

Fig. 1. Physical model of 3D nanofluid thin-film.

下载: 全尺寸图片幻灯片

图 2 接触点示意图

Fig. 2. Schematic diagram of contact points.

下载: 全尺寸图片幻灯片

图 3 三维纳米流体液膜各层蒸发图

Fig. 3. Evaporation diagram of each layer of 3D nanofluid thin-film.

下载: 全尺寸图片幻灯片

图 4 实验结果与模拟结果对比　(a) 实验结果^[31]; (b) 模拟结果

Fig. 4. Comparison between experimental and simulation results: (a) Experimental results^[31]; (b) simulation results.

下载: 全尺寸图片幻灯片

图 5 双尺度细胞网络结构模拟结果与实验结果对比　(a) 模拟结果; (b) 实验结果^[21]

Fig. 5. Comparison of simulation and experimental of dual-scale cellular network structure: (a) Simulation result; (b) experimental result^[21].

下载: 全尺寸图片幻灯片

图 6 双尺度纳米粒子环状结构模拟结果与实验结果对比　(a) 模拟结果; (b) 实验结果^[21]

Fig. 6. Comparison of simulation and experimental of dual-scale nano-rings structure: (a) Simulation result; (b) experimental result^[21].

下载: 全尺寸图片幻灯片

图 7 不同化学势锐度下封闭纳米流体液膜的沉积结构图　(a) Δμ_f = 0; (b) Δμ_f = 0.050; (c) Δμ_f = 0.100; (d) Δμ_f = 0.125; (e) Δμ_f = 0.150; (f) Δμ_f = 0.200

Fig. 7. Sedimentary pattern of nanofluid thin-film at different chemical potential sharpness: (a) Δμ_f = 0; (b) Δμ_f = 0.050; (c) Δμ_f = 0.100; (d) Δμ_f = 0.125; (e) Δμ_f = 0.150; (f) Δμ_f = 0.200

下载: 全尺寸图片幻灯片

图 8 不同临界蒸发率下封闭纳米流体液膜的沉积结构图　(a) ν_s = 1%; (b) ν_s = 10%; (c) ν_s = 30%; (d) ν_s = 55%; (e) ν_s = 80%; (f) ν_s = 100%

Fig. 8. Sedimentary pattern of nanofluid thin-film at different critical evaporation rates: (a) ν_s = 1%; (b) ν_s = 10%; (c) ν_s = 30%; (d) ν_s = 55%; (e) ν_s = 80%; (f) ν_s = 100%.

下载: 全尺寸图片幻灯片

[1]	Asha S K, Sunitha G 2019 J. Tai. Univ. Sci. 13 155 Google Scholar
[2]	Chen P W, Lee N C, Chien Y H, Wu J Y, Wang P C, Hwu W L 2014 Clin. Chim. Acta 431 19 Google Scholar
[3]	Shan Y G, Coyle T, Mostaghimi J 2007 J. Therm. Spray Technol. 16 736 Google Scholar
[4]	Sou T, Kaminskas L M, Nguyen T H, Carlberg R, Mcintosh M P, Morton D A V 2013 Eur. J. Pharm. Biopharm. 83 234 Google Scholar
[5]	Parsaiemehr M, Pourfattah F, Akbari O A, Toghraie D, Sheikhzadeh G 2017 Physica E 96 73
[6]	Shan Y G, Wang Y L, Coyle T 2013 Appl. Therm. Eng. 51 690 Google Scholar
[7]	Robbins M J, Archer A J, Thiele U 2011 J. Phys.: Condens. Matter 23 415102 Google Scholar
[8]	Chan H C, Paik S, Tipton Jr J B, Kihm K D 2007 Langmuir 23 2953 Google Scholar
[9]	Cui L, Zhang J, Zhang X 2012 Soft Matter. 8 10448 Google Scholar
[10]	Bhardwaj R, Fang X, Somasundaran P, Attinger D 2010 Langmuir 26 7833 Google Scholar
[11]	Chokprasombat K, Sirisathitkul C, Ratphonsan P 2014 Surf. Sci. 621 162 Google Scholar
[12]	Zhong X, Crivoi A, Duan F 2015 Adv. Colloid Interface Sci. 217 13 Google Scholar
[13]	Hamaker H C 1937 Phy. Sec. A 4 1058
[14]	Hofman J A. M H, Stein H N 1992 J. Colloid Interface Sci. 154 359 Google Scholar
[15]	Deegan R D, Bakajin O, Dupont T F, Huber G, Nagel S R, Witten T A 1997 Nature 389 827 Google Scholar
[16]	Rabani E, Reichman D R, Geissler P L 2003 Nature 426 271 Google Scholar
[17]	Seike W, Fisher M E 1980 Eur. Phys. J. B 40 71
[18]	Crivoi A, Duan F 2012 Phys. Chem. Chem. Phys. 14 1449 Google Scholar
[19]	Zhang H, Shan Y G, Li L, Lu M, Li R 2016 Appl. Therm. Eng. 94 650 Google Scholar
[20]	Martin C P, Blunt M O, Moriary P 2004 Nano Lett. 4 2389 Google Scholar
[21]	Stannard A, Martin C P, Pauliac V E, Philip M 2011 J. Phys. Chem. C 112 15195
[22]	Vancea I, Thiele U, Pauliac E A, Stannard A, Martin C P, Blunt M O, Moriarty P J 2007 Phys. Rev. Lett. 99 116103 Google Scholar
[23]	Yosef G, Rabani E 2006 J. Phys. Chem. B 110 20965 Google Scholar
[24]	Lyushnin A V, Golovin A A, Pismen L M 2002 Phys. Rev. E 65 021602
[25]	Vancea I, Thiele U 2008 Phys. Rev. E 78 041601
[26]	Frastia L, Archer A J, Thiele U 2011 Phys. Rev. Lett. 106 077801 Google Scholar
[27]	Zhang X, Crivoi A, Duan F 2015 Sci. Rep. 5 10926 Google Scholar
[28]	Sztrum C G, Hod O, Rabani E 2005 J. Phys. Chem. B 109 6741 Google Scholar
[29]	曹进军, 单彦广 2018 化学通报 81 641 Cao J J, Shan Y G 2018 Chem. Bull. 81 641
[30]	Stannard A 2011 J. Phys.: Condens. Matter 23 083001 Google Scholar
[31]	Jacobs K, Seemann R, Herminghaus S 2008 Eprint Arxiv. 243

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纳米流体液膜蒸发自组装双尺度沉积结构三维模拟