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Examples of most common silica structures involved in adsorbing NA: (A) pyramidal micropillars [33]; (B) surfaces packed with silica microbeads [9,10,38,44,68,76]; (C) colloidal sol-gel solutions packed with silica microbeads [24,25,43]; (D) silica wafer monolith [31,39,42,65] or polymer monolith with silica microbeads [69,75]; (E) silica membrane filters [29,47,53,55,56,59,72].
