Layer‐by‐Layer Assembled Nanotubes as Biomimetic Nanoreactors for Calcium Carbonate Deposition

Abstract

Enzyme-loaded magnetic polyelectrolyte multilayer nanotubes prepared by layer-by-layer assembly combined with the porous template could be used as biomimetic nanoreactors. It is demonstrated that calcium carbonate can be biomimetically synthesized inside the cavities of the polyelectrolyte nanotubes by the catalysis of urease, and the size of the calcium carbonate precipitates was controlled by the cavity dimensions. The metastable structure of the calcium carbonate precipitates inside the nanotubes was protected by the outer shell of the polyelectrolyte multilayers. These features may allow polyelectrolyte nanotubes to be applied in the fields of nanomaterials synthesis, controlled release, and drug delivery.

Layer-by-layer assemblies in nanoporous templates: nano-organized design and applications of soft nanotechnology

“…Furthermore, the calcium carbonate-filled hybrid nanotubes also contained Fe 3 O 4 nanoparticles and could be magnetically collected by applying an external magnetic field. 52 …”

“…Furthermore, the calcium carbonate-filled hybrid nanotubes also contained Fe 3 O 4 nanoparticles and could be magnetically collected by applying an external magnetic field. 52 Heterostructured titania-polyelectrolyte nanotubes were also successfully prepared by sequential LbL deposition of titanium (IV) bis(ammonium lactato) dihydroxide (TALH) and poly(ethylenimine) (PEI) inside the cylindrical pores of a TEPC templates, followed by calcination at various temperatures. 53 TALH is stable in neutral solutions 54 and represents an excellent candidate for the preparation of titania-based thin films using aqueous chemistry.…”

Antibacterial hybrid materials fabricated by nanocoating of microfibril bundles of cellulose substance with titania/chitosan/silver-nanoparticle composite films

“…It has been demonstrated that the biomimetic synthesis provides a unique shortcut to functional materials with designed properties. [52][53][54][55] The currently developed approach is of great generality for the self-assembly of various functional molecules or guest substances onto the titania gel lm activated surface of cellulose materials, and it provides a pathway to accomplish the combination of the internal excellent properties of natural cellulose materials (e.g., large surface area, exibility, nontoxicity, biodegradability etc.) and the functionalities of guest species to fabricate various advanced cellulose-based functional materials.…”

Regulating Cell Apoptosis on Layer-by-Layer Assembled Multilayers of Photosensitizer-Coupled Polypeptides and Gold Nanoparticles

“…Targeted cell detachment is of significant interest and presents new capabilities and opportunities in areas such as biomedicine, cell biology, implantable biomaterials, and tissue engineering 1 2 3 4 5 6 . Among the variety of available techniques for targeted cell detachment (regulation of cell apoptosis) 7 8 9 10 11 , the layer-by-layer (LbL) assembly method plays a pioneering role, because it possesses extraordinary advantages for applications of regulating cell growth and apoptosis including easy formation of supported films, flexible control over structures, combination of various ingredients, adjustable physical properties 12 13 14 15 . A wide variety of functional materials such as biological polymers and inorganic nanoparticles can be readily combined for achieving properties corresponding to each type of materials and integrated functionalities, thus leading to the control over mechanical strength and biocompatibility of LbL assembled films 16 17 18 19 .…”