期刊
CARBON
卷 171, 期 -, 页码 597-609出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2020.08.074
关键词
Single-walled carbon nanotubes; Single chirality SWNT separation; Nanomaterials purification; Sephacryl S200; Hydrogel synthesis
资金
- Air Force Research Laboratory United States Air Force Academy Directorate, through the Air Force Office of Scientific Research Summer Faculty Fellowship Program(R) [FA8750-15-3-6003, FA9550-15-0001]
An alternative approach for understanding and advancing hydrogel-based SWNT purification has been described and employed, including experimental and atomistic modeling analysis. The role of the radical initiator APS in hydrogel-based SWNT purification has been explored through synthesis and characterization of gels containing varied APS concentration, revealing the significant impact of charged organosulfate groups on SWNT-gel interactions. This work demonstrates enhanced methodology for hydrogel-based SWNT purification and lays the foundation for further optimization of the gel medium.
An alternative approach toward understanding and advancing hydrogel-based single walled carbon nanotube (SWNT) purification is described and employed. Experimental and atomistic modeling analysis of the leading hydrogel for SWNT purification, Sephacryl S200, affords creation of gels that mimic its behavior in terms of dependent SWNT interaction and SWNT purification properties. This achievement introduces a generalized approach toward optimization of SWNT purification media with respect to the components of Sephacryl. Here, the role of the radical initiator ammonium persulfate (APS) in hydrogel-based SWNT purification is explored through synthesis and characterization of gels containing varied APS concentration, and thus, varied amounts of covalently embedded charged organosulfate groups (R-SO4-). The presence of these moieties plays a significant role in SWNT-gel interactions: at decreasing APS concentration SWNT uptake is increased, the chiral profiles of purified SWNT are altered, and a greater fraction of adsorbed material is recovered. Tailored hydrogels containing minimal APS exhibit improved SWNT adsorption vs. Sephacryl. These findings warrant proposition of a four-step qualitative model that deconvolutes electrostatic and steric effects within SWNT/surfactant/hydrogel systems. Collectively, this work demonstrates enhanced methodology for hydrogel-based SWNT purification and lays the foundation for further optimization of the gel medium. (C) 2020 Elsevier Ltd. All rights reserved.
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