Mesoporous carbon hollow spheres encapsulated phase change material for efficient emulsification of high-viscosity oil

Limei Dong; Yiming Li; Junfeng Li; Yihao Guan; Xiuping Chen; Dan Zhang; Zhining Wang

doi:10.1016/j.jhazmat.2023.131112

Mesoporous carbon hollow spheres encapsulated phase change material for efficient emulsification of high-viscosity oil

J Hazard Mater. 2023 Jun 5:451:131112. doi: 10.1016/j.jhazmat.2023.131112. Epub 2023 Feb 28.

Authors

Limei Dong¹, Yiming Li², Junfeng Li¹, Yihao Guan¹, Xiuping Chen¹, Dan Zhang¹, Zhining Wang³

Affiliations

¹ Frontiers Science Center for Deep Ocean Multispheres and Earth System/Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, 266100 Qingdao, PR China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, PR China.
² Frontiers Science Center for Deep Ocean Multispheres and Earth System/Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, 266100 Qingdao, PR China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, PR China. Electronic address: liym@ouc.edu.cn.
³ Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, PR China.

PMID: 36871462
DOI: 10.1016/j.jhazmat.2023.131112

Abstract

Low fluidity of high-viscosity oil usually hinders its emulsification. Facing this dilemma, we proposed a novel functional composite phase change material (PCM) with in situ heating feature coupled with emulsification capability. This composite PCM consisting of mesoporous carbon hollow spheres (MCHS) and polyethylene glycol (PEG) shows excellent photothermal conversion ability, thermal conductivity and Pickering emulsification. Compared with the currently reported composite PCMs, the unique hollow cavity structure of MCHS not only enables excellent encapsulation of PCM, but also protects the PCM from leaking and direct contact with oil phase. Importantly, the thermal conductivity of 80% PEG@MCHS-4 was determined to be 1.372 W/m·K, which was 2.887 times superior to that of pure PEG. MCHS endows the composite PCM with excellent light absorption capacity and photothermal conversion efficiency. The viscosity of high-viscosity oil can be facilely reduced in situ once it comes into contact with the heat-storing PEG@MCHS, thus the emulsification is greatly enhanced. In view of the in situ heating feature and emulsification capability of PEG@MCHS, this work puts forward a novel solution to address the problem of emulsification of high-viscosity oil through the integration of MCHS and PCM.

Keywords: Emulsification; High-viscosity oil; Mesoporous carbon hollow spheres; Phase change materials; Viscosity reduction.