Understanding the Exfoliation and Dispersion of Hexagonal Boron Nitride Nanosheets by Surfactants: Implications for Antibacterial and Thermally Resistant Coatings
Understanding the Exfoliation and Dispersion of Hexagonal Boron Nitride Nanosheets by Surfactants: Implications for Antibacterial and Thermally Resistant Coatings
复制标题
了解表面活性剂对六方氮化硼纳米片的剥离和分散：对抗菌和耐热涂料的影响
DOI：
10.1021/acsanm.0c02437
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发表时间：
2021
影响因子：
5.9
通讯作者：
Martí, Angel A.
中科院分区：
文献类型：
--
作者：
Smith McWilliams, Ashleigh D.;Martínez-Jiménez, Cecilia;Matatyaho Ya’akobi, Asia;Ginestra, Cedric J.;Talmon, Yeshayahu;Pasquali, Matteo;Martí, Angel A.
六方氮化硼 (hBN) 是石墨烯的结构类似物，具有独特的机械、热和光学特性，使其适合各种应用。生产良好剥离的六方氮化硼纳米片的稳定分散体，特别是以无毒且廉价的方式，是工业规模生产六方氮化硼宏观材料的重要一步。在这里，我们研究了使用表面活性剂在水溶液中剥离和分散六方氮化硼。根据分散体产率、质量和稳定性对九种不同表面活性剂和水中的分散体进行比较。结果表明，在低离心力下，大分子量非离子表面活性剂分散了大部分材料。相反，当应用更强的离心时，所有表面活性剂产生相似的分散体产率，离子表面活性剂中的分散体含有明显更多的剥离纳米片，并且在更长的时间内保持稳定。最后，为了证明这些系统在制造宏观材料方面的可扩展性和有效性，使用六方氮化硼在十二烷基硫酸钠（SDS）中的分散体来生产透明的六方氮化硼薄膜，该薄膜可以沉积在玻璃上，并有可能用作抗菌或耐热涂层。
Hexagonal boron nitride (hBN) is a structural analog of graphene, with unique mechanical, thermal, and optical properties that make it desirable for a variety of applications. Production of stable dispersions of well-exfoliated hBN nanosheets, particularly in a nontoxic and inexpensive way, is an important step in the production of hBN macromaterials on an industrial scale. Here, we investigate the use of surfactants for exfoliating and dispersing hBN in aqueous solution. Dispersions in nine different surfactants and water were compared based on dispersion yield, quality, and stability. It was revealed that at low centrifugal force, large-molecular-weight nonionic surfactants disperse the most material. In contrast, when stronger centrifugation is applied, all surfactants produce similar dispersion yields, with dispersions in ionic surfactants containing significantly more exfoliated nanosheets and remaining stable over much longer periods of time. Finally, to demonstrate the scalability and effectiveness of these systems for making macroscopic materials, a dispersion of hBN in sodium dodecyl sulfate (SDS) was used to produce a transparent hBN film that can be deposited on glass and potentially used as an antibacterial or thermally resistant coating.