Click the "blue" button above to subscribe to evaporation, which is a very important phenomenon in nature and widely used in various production and life processes, such as steam sterilization, steam power generation, desalination, etc. Since 2014, with the characteristics of "thermal localization", the interface evaporation has realized the efficient utilization of solar energy heat, which has caused extensive exploration and research by researchers. However, at present, the research of solar driven interface evaporation focuses more on the influence of material absorption rate on desalination efficiency, and less on the control of water transportation in the process of gas-liquid interface evaporation.
Researchers have proposed a new assembly method, "rotating fill", which will commercially melamine foam (skeleton support), silica nanoparticles (water transport regulation, increase mechanical strength), and cuttlefish juice nanoparticles (absorbents) ingeniously assembled into a highly safe, mechanically mild, self floating long time cuttlefish juice based solar drive. Dynamic interface evaporation device.
Figure 1 performance of evaporation device with different water transport capacity: super hydrophilic design (left), water transport control design (right)
Through the design of water transport regulation formed by hydrophobic silica nanoparticles filling, the ink based evaporation device can maintain the maximum evaporation and achieve the control efficiency of more than 90% water transport. The evaporation efficiency of gas-liquid can reach 85.8% under one time sunlight. Through experiments and COMSOL simulation, it can be seen that water transport control has the following advantages compared with super hydrophilic design (Fig. 1): 1. Proper amount of water entering the absorber can effectively avoid a large increase in the thermal conductivity of the absorber, which is conducive to the stable and rapid formation of "thermal localization" state. 2. The existence of proper amount of water in the evaporator can effectively avoid the heat loss caused by the evaporation sensible heat of absorbing excessive water in the body, so as to improve the solar energy heat utilization efficiency. 3. Through the regulation of water transportation, because there is no large amount of water cooling at the edge of the evaporator, an additional evaporation area is formed (the evaporation efficiency of this area is about 4.8% according to the calculation in the experiment). 4. Water transport control can reduce the heating of extra frontal water by heat and greatly shorten the response time of evaporation rate of the squid juice solar evaporator, which is conducive to the use of evaporation devices in cloudy weather.
Fig. 2. (a) the change of seawater quality with time in different salinity under one time sunlight irradiation (b) the biosafety experiment of cuttlefish juice nanoparticles: the cell activity test of different concentrations of melanin nanoparticles (c) and (d) the 24-hour change of blank group and cuttlefish juice nanoparticles in the cell activity experiment (E) the change of outdoor experimental light intensity, 2019-10-24, boat Photo of CMF infrared thermal imager (10.25cm in diameter) before the experiment in Shan, China (f), time 2019-10-24, 14:30 (g), optical photo and infrared camera photo with sample diameter of 4.25cm (upper) and 10.25cm (lower) in natural sunlight, time 2019-10-25, 10:30-11:30 (H), histogram of element changes before and after desalination of sea water in the East China Sea, red line indicates who regulations The maximum content of corresponding elements in drinking water.
In addition, the researchers applied the squid evaporation device to desalination experiments of simulated seawater of different concentrations and seawater of the East China Sea (Fig. 2). It can be seen from the experiment that the desalinated water quality meets the WHO drinking water standard. In addition, the biosafety of the material was investigated to avoid chemical damage to human body or marine organisms in practical application. As expected, in different concentrations of cell activity experiments, the IC50 observed is more than 100mg / ml, which has low toxicity and good biological adaptability.
Recently, the above work was published in the international well-known journal nano under the title of "engineering controlled water transport of biosafety cutlefish juice solar absorber toward remark enhanced solar driven gas liquid interface evaluation" [1] Energy, the first author of this paper is Li Zhengtong, a postgraduate of Shaanxi University of science and technology, Zhang Jing, a postgraduate of Zhejiang Ocean University, Wang Chengbing, a professor of Shaanxi University of science and technology, and Zhou Yingtang, a professor of Zhejiang Ocean University, are the co authors of this paper. This work is supported by the national natural fund project, Zhoushan science and technology project, environmental special project of Putuo District, Zhoushan City, etc.
In recent years, Professor Wang Chengbing's team of Shaanxi University of science and technology has been exploring the application of biomass materials in the study of interfacial evaporation, and has been widely concerned and recognized by researchers inside and outside the industry.
In the advanced materials series, solar RRL published the frontier progress report on materials, structures and applications of interface evaporation based on biomass correlation [2], which was selected as the latest ESI high cited paper.
In advanced sustainable systems, bamboo based carbon materials were published to be used in interface evaporation [3], and the air gap formed by bamboo natural arch structure in the evaporation interface was used. The air has low heat transfer efficiency, which can greatly reduce the heat transfer loss in the evaporation process. This paper was invited by the media materials views China to make a highlight report.
At energy Technology has published the application of flour based carbon materials in interface evaporation [4]. Inspired by the traditional Chinese technology of "kneading clay man", flour based carbon materials can be used to prepare a variety of typical and efficient evaporation structures, such as arch, umbrella, hollow cylinder, solid cylinder, hemispherical and so on. Researchers study the different stacking methods of the same material at the system level The energy loss in the process of surface evaporation fully shows that the whole evaporation device has lower thermal resistance, which makes full use of solar heat, and provides an important reference for the practical application of the interface evaporation device. This paper was selected as the current inner cover.
In Journal of Materials Chemistry A, potato based carbon based materials were applied to interface evaporation [5]. The researchers found that the porous carbon foams formed after carbonization of potatoes had excellent wettability and could form high-speed water transport channels at the gas liquid interface. Based on this, a new salt evaporation strategy for interface evaporation was proposed. The paper was selected by the editorial department as the hot topic of the magazine, and also as the cover paper.
reference:
[1] Zhengtong Li, Jing Zhang, Shaohong Zang, Chao Yang, Hua Jin, Fei Jin, Yang Liu, Jiankun Hu, Chengbing Wang*, Yingtang Zhou*, Engineering controllable water transport of biosafety cuttlefish juice solar absorber toward remarkably enhanced solar-driven gas-liquid interfacial evaporation, Nano Energy (2020), DOI: 10.1016/j.nanoen.2020.104834.
[2] Zhengtong Li, Chengbing Wang*, Jinbu Su, San Ling, Wei Wang, Meng An*, Fast-growing field of interfacial solar steam generation: evolutional materials, engineered architectures, and synergistic applications, Solar RRL 3 (2019) 1800206.
[3] Zhengtong Li, Chengbing Wang*, Tao Lei, Hailin Ma, Jinbu Su, San Ling, Wei Wang, Arched bamboo charcoal as interfacial solar steam generation integrative device with enhanced water purification capacity, Advanced Sustainable Systems 3 (2019) 1800144
[4] Zhengtong Li, Chengbing Wang*, Zeyu Li, Lin Deng, Jinbu Su, Jin Shi, Meng An*, Efficient interfacial solar steam generator with controlled macromorphology derived from flour via "dough figurine" technology, Energy Technology 7 (2019) 1980344.
[5] Chengbing Wang*, Jiulong Wang, Zhengtong Li, Keyuan Xu, Weike Wang*, Superhydrophilic porous carbon foam as self-desalting monolithic solar steam generation device with extremely high energy efficiency, Journal of Materials Chemistry A (2020), DOI: 10.1039/D0TA01439G.
Paper link:
https://www.sciencedirect.com/science/article/abs/pii/S2211285520303918
Relevant progress
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