Three-dimensional aggregation of fullerene C₆₀ at the air-water interface

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• 作者：Arkady M. Kolker ; Nicholas Yu. Borovkov ; ^{nyb@isc-ras.ru}
• 关键词：Fullerene ; C60 ; Aggregation ; Polylayer ; Phase separation
• 刊名：Colloids and Surfaces A: Physicochemical and Engineering Aspects
• 出版年：2012
• 出版时间：20 November, 2012
• 年：2012
• 卷：414
• 期：Complete
• 页码：433-439
• 全文大小：995 K

文摘

This paper seeks to get a mechanistic insight into homomolecular aggregation of fullerenes in low-dimensional systems. For this purpose, the forced aggregation of fullerene C₆₀ on two subphases (pristine water and aqueous 1 % NaCl solution) has been studied by analysis of the compression curves and Brewster angle microscopy (BAM). The analysis indicates that the highest ordered structure being achievable upon multi-cycle compression is the C₆₀ hexalayer. The lower aggregation stages are directly observable by BAM. The floating layers are stated to be organized as a binary colloid system C₆₀-H₂O, where the C₆₀ component behaves as a guest initially but becomes a host towards the tetralayer stage. In turn, the H₂O component inhibits the structural collapse and promotes the smooth vertical growth of the C₆₀ aggregates. The polylayers exhibit a variety of morphological features, both aggregated species and structural defects, whose evolution is discussed in terms of the vertical and lateral phase separation.