Template‐Directed Fabrication of Anatase TiO₂ Hollow Nanoparticles and Their Application in Photocatalytic Degradation of Methyl Orange

Abstract

Polymerization-induced self-assembly (PISA) was used to fabricate polymeric nanoparticles via reversible addition-fragmentation chain transfer (RAFT) dispersion polymerization of benzyl methacrylate (BzMA) using diblock copolymer poly(glycerol monomethacrylate)-block-poly(2-dimethylaminoethyl methacrylate) (PGMMA-PDMAEMA-CTA) as the macro RAFT agent. The dispersion of polymeric nanoparticles with a final concentration of about 210 mg/g (solid content of 21%) was obtained via this efficient method (PISA). The resultant polymeric nanoparticles consisting of corona-shell-core three layers with weak polyelectrolyte PDMAEMA as the shell were used as sacrificial template to fabricate TiO 2 hollow nanoparticles. The negatively charged titanium precursor was absorbed into the PDMAEMA shell via the electrostatic interaction, and hydrolyzed to form polymer/TiO 2 hybrid nanoparticles. Anatase TiO 2 hollow nanoparticles were formed after removing the polymeric templates by calcination at 550 ℃. The experiments of photocatalytic degradation of methyl orange showed that the resultant anatase TiO 2 hollow nanoparticles had high photocatalytic activity and good reusability.

Polymerization‐Induced Self‐Assembly of Functionalized Block Copolymer Nanoparticles and Their Application in Drug Delivery

“…Because the shell‐forming polymers generally act as stabilizer, their chemical nature dictates surface properties of the polymeric nanoparticle. Due to development of the synthetic technique, more and more functional polymers were fabricated and then used as the stabilizer and initiator (or control agent) in the synthesis of functional polymeric nanoparticles via PISA, which aroused increasing attention in a broad range of applications . Certain PISA‐generated nanoparticles displayed stimuli‐responsive shape shifting, typically between spherical micelles, worms, and vesicles, and this subject has been detailed in a recent review .…”

pH- and Reductant-Responsive Polymeric Vesicles with Robust Membrane-Cross-Linked Structures: In Situ Cross-Linking in Polymerization-Induced Self-Assembly

“…The chemical nature of the stabilizer dictates the surface properties of the nano-objects. Because of the versatility of RAFT technique, various functional macro-CTAs are synthesized and then used as the stabilizer to fabricate functional polymeric nano-objects via PISA, which have been receiving increasing attention in a broad range of materials application. − However, in comparison with the traditional self-assembly method, PISA is unsatisfactory in preparation of vesicles with chemical versatility of membrane-forming block for tunable membrane properties, which is due to that much fewer monomers (especially functional monomers) are suitable for PISA to fabricate vesicles. − Thus, developing new monomers, especially functional monomers, for PISA is necessary to broaden the tunability of PISA-based intelligent vesicles for further application.…”

Preparation of Multi-chambered Vesicles by Polymerization-induced Self-assembly and the Influence of Solvophilic Fragments in the Core-forming Blocks

“…聚合物纳米材料因其在药物传输、传感器、纳米反 应器和催化剂载体等领域的应用前景而备受关注 [1][2][3][4][5][6][7][8][9][10] . 嵌段聚合物在稀溶液中的自组装是制备聚合物纳米材 料的常用手段, 一般需要经过如下几步: 合成嵌段聚合 物、分离提纯得到纯净的嵌段聚合物、将嵌段聚合物溶 解在良溶剂然后谨慎地滴加某一嵌段的不良溶剂从而 诱导嵌段聚合物自组装制备纳米材料 [11][12][13][14] .…”