Abstract
Raw halloysite nanotubes (HNTs) typically are natural clay minerals with a unique hollow nanotubular structure includes two-layered aluminosilicate, adequate hydroxyl groups at its surface, and the gap space between its layers [1].
Highlights
Raw halloysite nanotubes (HNTs) typically are natural clay minerals with a unique hollow nanotubular structure includes two-layered aluminosilicate, adequate hydroxyl groups at its surface, and the gap space between its layers [1]
Dendritic amine groups add onto HNTs by the Michael addition of methyl acrylate (MA)
Hydroxyl groups are a presence at the surface of HNTs, and large pore volume makes them the best candidates for the modification with organic and inorganic materials to enhance loading capacity
Summary
Raw halloysite nanotubes (HNTs) typically are natural clay minerals with a unique hollow nanotubular structure includes two-layered aluminosilicate, adequate hydroxyl groups at its surface, and the gap space between its layers [1]. HNTs have a variety of morphologies, such as spheroidal, platy, and tubular structure, the most well-known of which is the tubular form It is abundant in many countries such as China, the United States, Brazil and France [3]. The different chemical composition of the outer and inner surface of halloysite layers gives this nanomaterial novel features which do not exist in other clay minerals. These chemical compositions reveal a significant tendency to adsorb various guest compounds such as drugs [5,6], dyes heavy metal ions, and contaminant [7]. The present mini-review covers two different main methods for growing dendritic compounds onto the surface of HNTs by a dendritic polymer
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