초록 열기/닫기 버튼
Natural halloysite kaolin contains many impurities, such as quartz phases, and varies in morphology and size during its formation in the earth. For it to be utilized as a new type of natural nano material, it is necessary to remove quartz impurities from the kaolin clays without affecting the morpholgy of its tubes. To remove quartz impurities from the kaolin by forming a well deflocculated aqueous slip without fracturing the morphology of the tubes, a slip of homogenized halloysite clay was recovered by adding polyvalent metallic cations and anionic polyelectrolyte flocculants simultaneously. This selectively flocculates the mixture of quartz and halloysite so that the halloysite particles form flows while the tubular halloysite remains in suspension. A dry separation process by grinding milling was adapted to compare the fine morphologies. Then a uniform size and tubular shape of the halloysite was obtained, and this could be used as a suitable container or a carrier to encapsulate nanomaterials.
