Preparation and water sorption properties of novel SiO2-LiBr microcapsules for water-retaining pavement

doi:10.1016/j.cjche.2021.01.007

中国化学工程学报 ›› 2021, Vol. 34 ›› Issue (6): 230-241.DOI: 10.1016/j.cjche.2021.01.007

• Special Topic: Progress in Advanced Energy Technologies and Materials • 上一篇下一篇

Preparation and water sorption properties of novel SiO₂-LiBr microcapsules for water-retaining pavement

Wenjing Li^1,2,3, Gilmore Wellio¹, Tiejun Lu¹, Changjun Zou², Yongliang Li¹

1 School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK;
2 College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China;
3 Chengdu Advanced Metal Materials Industry Technology Research Institute Co., Ltd, Chengdu 610000, China

收稿日期:2020-02-14 修回日期:2020-12-04 出版日期:2021-06-28 发布日期:2021-08-30
通讯作者: Yongliang Li
基金资助:
The authors would like to acknowledge the financial support of The National Scholarship Foundation of China, China Scholarship Council ([2018] 3101).

Preparation and water sorption properties of novel SiO₂-LiBr microcapsules for water-retaining pavement

Wenjing Li^1,2,3, Gilmore Wellio¹, Tiejun Lu¹, Changjun Zou², Yongliang Li¹

1 School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK;
2 College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China;
3 Chengdu Advanced Metal Materials Industry Technology Research Institute Co., Ltd, Chengdu 610000, China

Received:2020-02-14 Revised:2020-12-04 Online:2021-06-28 Published:2021-08-30
Contact: Yongliang Li
Supported by:
The authors would like to acknowledge the financial support of The National Scholarship Foundation of China, China Scholarship Council ([2018] 3101).

摘要/Abstract

摘要： Novel SiO₂-LiBr microcapsules for water-retaining pavement were prepared and firstly characterized by scanning electron microscope (SEM), particle size analysis, and Fourier transform infrared spectroscopy (FT-IR). The water vapor sorption and desorption of the formulated microcapsules was then experimentally studied using dynamic vapor sorption (DVS), with the results fitted to three kinds of adsorption kinetics models. In addition, the specific surface area (SSA) was also calculated based on BET theory; and the thermal performance was investigated by laser flash analysis (LFA). Experimental results show a change of 103% in mass of the microcapsule sample under 90% relative humidity (RH) at 30 ℃ after water vapor sorption. The fitting of results indicates that the adsorption process is mainly governed by the intra-particle diffusion mechanism, followed by the pseudo-first-order adsorption process. In comparison with most conventional pavement materials, it is found that the SSA of the formulated microcapsules is much larger while the thermal conductivity is lower. The unique properties of the formulated SiO₂-LiBr microcapsules have significant potential to take the edge off the urban heat island effect and reduce rutting when applied to water-retaining pavement materials.

关键词: Microcapsules, Water vapor sorption, Thermal performance, Adsorption kinetics, Water-retaining pavement

Abstract: Novel SiO₂-LiBr microcapsules for water-retaining pavement were prepared and firstly characterized by scanning electron microscope (SEM), particle size analysis, and Fourier transform infrared spectroscopy (FT-IR). The water vapor sorption and desorption of the formulated microcapsules was then experimentally studied using dynamic vapor sorption (DVS), with the results fitted to three kinds of adsorption kinetics models. In addition, the specific surface area (SSA) was also calculated based on BET theory; and the thermal performance was investigated by laser flash analysis (LFA). Experimental results show a change of 103% in mass of the microcapsule sample under 90% relative humidity (RH) at 30 ℃ after water vapor sorption. The fitting of results indicates that the adsorption process is mainly governed by the intra-particle diffusion mechanism, followed by the pseudo-first-order adsorption process. In comparison with most conventional pavement materials, it is found that the SSA of the formulated microcapsules is much larger while the thermal conductivity is lower. The unique properties of the formulated SiO₂-LiBr microcapsules have significant potential to take the edge off the urban heat island effect and reduce rutting when applied to water-retaining pavement materials.

Key words: Microcapsules, Water vapor sorption, Thermal performance, Adsorption kinetics, Water-retaining pavement

Wenjing Li, Gilmore Wellio, Tiejun Lu, Changjun Zou, Yongliang Li. Preparation and water sorption properties of novel SiO₂-LiBr microcapsules for water-retaining pavement[J]. 中国化学工程学报, 2021, 34(6): 230-241.

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Preparation and water sorption properties of novel SiO₂-LiBr microcapsules for water-retaining pavement

Preparation and water sorption properties of novel SiO₂-LiBr microcapsules for water-retaining pavement

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