BaSO4 Crystals Grown at an Expanding Liquid-Liquid Interface in a Radial Hele-Shaw Cell Show Spontaneous Large-Scale Assembly into Filaments

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• 作者：Debabrata Rautaray ; Arun Banpurkar ; Sudhakar R. Sainkar ; Abhay V. Limaye ; Satish Ogale ; and Murali Sastry
• 刊名：Crystal Growth & Design
• 出版年：2003
• 出版时间：July 2003
• 年：2003
• 卷：3
• 期：4
• 页码：449 - 452
• 全文大小：141K
• 年卷期：v.3,no.4(July 2003)
• ISSN：1528-7505

文摘

Control over the crystallography, morphology, and spontaneous organization of ceramic crystals are importantgoals in advanced materials engineering with important application potential. Most studies hitherto have concentratedon static charged interfaces as templates for the controlled nucleation and growth of ceramic crystals. In this communication,we show that BaSO₄ crystals grown at a steadily expanding liquid-liquid interface populated by fatty acid moleculesspontaneously organize themselves into highly linear superstructures over large length-scales. This experiment is realizedin a radial Hele-Shaw cell where the liquid-liquid interfacial growth rate and consequently time scales such as arrival ofsurfactant molecules to the interface etc. may be readily modulated. Possible reasons for the regular assembly of baritecrystals are discussed.