文献类型：期刊文献

英文题名：Hydrophobicity-induced electrostatic interfacial self-assembly for porous silica nanospheres with tunable pore sizes and pore hierarchies

作者：Qin, Limei[1];Niu, Dechao[1];Li, Nan[1];Luo, Xiaofeng[1];Qin, Xing[1];Chen, Jianzhuang[1];Li, Yongsheng[1];Shi, Jianlin[1,2]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Low Dimens Mat Chem Lab, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, 1295 Ding Xi Rd, Shanghai 200050, Peoples R China

年份：2021

卷号：405

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20204009257265);WOS:【SCI-EXPANDED(收录号:WOS:000621648000002)】；

基金：This work was financially supported by the National Key Research and Development Program of China (Grant No. 2016YFA0203700); The National Natural Science Foundation of China (Nos. 51621002 and 51672083); Program of Shanghai Academic/Technology Research Leader (18XD1401400); Basic Research Program of Shanghai (17JC1404702); Leading talents in Shanghai in 2018; The Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning and the 111 project (B14018).

语种：英文

外文关键词：Hierarchical porous silica materials; Precise control; Hydrophobic polymer; Magnetite; Magnetic resonance imaging

摘要：Porous materials have distinct advantages in catalysis, adsorption, and biomedicine due to their excellent loading spaces and high stability. However, the precise control on the sizes and hierarchies/distributions of pore channels in a nanoscale matrix is still challenging. Herein, a simple but efficient hydrophobicity-induced electrostatic interfacial self-assembly (HEISA) strategy is developed to synthesize porous silica nanospheres (PSNs) with large tunable pore sizes (10-30 nm) and pore hierarchies (dual-pores and tri-modal pores). In the synthesis processes, hydrophobic homopolymers polystyrene (PS) can not only act as pore-swelling agents for the enlargement of pore channels up to 30 nm, but also induce the evolution of pore hierarchies from dual-modal PSNs to tri-modal PSNs. By employing hydrophobic homopolymers as hydrophobicity-induced agents, a "homopolymer-mediated enlarging mesopore and creating macropore" mechanism is proposed. The degradation behaviors of PSNs in phosphate buffer saline (PBS) exhibited a pore size- and concentration-dependent manners. Furthermore, the maximum loading amount of PSNs reached 143 +/- 46 mg/g of bovine serum albumin (BSA) and 258 +/- 30 mg/g of catalase (CAT). More interestingly, a magnetic functionalized tri-modal PSNs with unique "vesicular" morphology was obtained by employing hydrophobic magnetite nanocrystals as hydrophobicity-induced agents via this HEISA approach, which showed an ultra-high transverse relaxivity up to 670.5 mMFe(-1).S-1 in the T-2-weighted magnetic resonance imaging. We therefore conceive that this proposed HEISA methodology provides a general pathway for developing ultra-large-pore mesoporous silica nanoparticles and hierarchical pore structures with various compositions and functions, further allowing the improvement of properties in biomedicine, catalysis, energy conversion and storage and adsorption or separation.