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About the Cover: (Upper left) Highly ordered funnel-like BaCrO4 superstructures with complex form and a remarkable self-similar growth pattern as well as very long BaSO4 fiber bundles with repetitive growth patterns (upper right, lower left and right) can be readily generated by using sodium polyacrylate as a structure directing agent in the room temperature mineralization process. The whole structure is composed of single crystalline fibers with ca.20 nm diameter, variable length of up to 200 μm. The formation of fibers and fiber bundles as well as finer morphological details can be affected by variation of the temperature, pH, and concentration. S.-H. Yu, M. Antonietti, H. C|$$|Adolfen, and J. Hartmann, p 379. View the article.
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