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Shaping Nanoparticles for Interface Catalysis: Concave Hollow Spheres via Deflation-Inflation Asymmetric Growth.
Advanced Science ( IF 14.3 ) Pub Date : 2020-05-19 , DOI: 10.1002/advs.202000393
Rongtai Yu 1, 2 , Xiaodan Huang 2 , Yang Liu 2, 3 , Yueqi Kong 2 , Zhengying Gu 2, 3 , Yang Yang 2 , Yue Wang 2 , Wenhuang Ban 2 , Hao Song 2 , Chengzhong Yu 2, 3
Affiliation  

Hollow spheres are charming objects in nature. In this work, an unexpected deflation–inflation asymmetric growth (DIAG) strategy is reported, generating hollow nanoparticles with tailored concave geometry for interface catalysis. Starting from aminophenol‐formaldehyde (APF) nanospheres where the interior crosslinking degree is low, fully deflated nanobowls are obtained after etching by acetone. Due to APF etching and repolymerization reactions occuring asymmetrically within a single particle, an autonomous inflation process is observed similar to a deflated basketball that inflates back to a “normal” ball, which is rare at the nanoscale. A nucleophilic addition reaction between acetone and APF is elucidated to explain the chemistry origin of the DIAG process. Interestingly, the deflated APF hollow spheres enable preferential immobilization of lipase in the concave domain, which facilitates the stabilization of Pickering emulsion droplets for enhanced enzymatic catalysis at the oil–water interface. The study provides new understandings in the designable synthesis of hollow nanoparticles and paves the way toward a wide range of applications of asymmetric architectures.

中文翻译:


用于界面催化的成型纳米粒子:通过紧缩-膨胀不对称生长的凹空心球。



空心球体是自然界中迷人的物体。在这项工作中,报告了一种意想不到的通缩-膨胀不对称生长(DIAG)策略,生成具有用于界面催化的定制凹面几何形状的中空纳米颗粒。以内部交联度较低的氨基苯酚甲醛(APF)纳米球为原料,经丙酮蚀刻后得到完全收缩的纳米碗。由于 APF 蚀刻和再聚合反应在单个粒子内不对称地发生,因此观察到类似于泄气的篮球膨胀回“正常”球的自主膨胀过程,这在纳米尺度上是罕见的。丙酮和 APF 之间的亲核加成反应被阐明,以解释 DIAG 过程的化学起源。有趣的是,放气的 APF 空心球能够优先将脂肪酶固定在凹域中,这有助于稳定 Pickering 乳液液滴,从而增强油水界面的酶催化作用。该研究为中空纳米颗粒的可设计合成提供了新的理解,并为不对称结构的广泛应用铺平了道路。
更新日期:2020-07-08
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