title: Coordination-Enabled One-Step Assembly of Ultrathin, Hybrid Microcapsules with Weak pH-Response.
abstract: In this study, an ultrathin, hybrid microcapsule is prepared though coordination-enabled one-step assembly of tannic acid (TA) and titanium(IV) bis(ammonium lactate) dihydroxide (Ti-BALDH) upon a hard-templating method. Briefly, the PSS-doped CaCO3 microspheres with a diameter of 5-8 μm were synthesized and utilized as the sacrificial templates. Then, TA-Ti(IV) coatings were formed on the surface of the PSS-doped CaCO3 templates through soaking in TA and Ti-BALDH aqueous solutions under mild conditions. After removing the template by EDTA treatment, the TA-Ti(IV) microcapsules with a capsule wall thickness of 15 ± 3 nm were obtained. The strong coordination bond between polyphenol and Ti(IV) conferred the TA-Ti(IV) microcapsules high structural stability in the range of pH values 3.0-11.0. Accordingly, the enzyme-immobilized TA-Ti(IV) microcapsules exhibited superior pH and thermal stabilities. This study discloses the formation of TA-Ti(IV) microcapsules that are suitable for use as supports in catalysis due to their extensive pH and thermal stabilities.
authors.affiliation: §Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China.
authors.forename: Chen
authors.initials: C
authors.lastname: Yang
authors.affiliation: §Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China.
authors.forename: Hong
authors.initials: H
authors.lastname: Wu
authors.affiliation: §Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Yang
authors.affiliation: §Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China.
authors.forename: Jiafu
authors.initials: J
authors.lastname: Shi
authors.affiliation: §Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China.
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Wang
authors.affiliation: §Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China.
authors.forename: Shaohua
authors.initials: S
authors.lastname: Zhang
authors.affiliation: §Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China.
authors.forename: Zhongyi
authors.initials: Z
authors.lastname: Jiang
mesh_terms: D002119:Calcium Carbonate / Q000737:chemistry; D002214:Capsules / Q000138:chemical synthesis*; D003460:Crystallization / Q000379:methods; D003692:Delayed-Action Preparations / Q000138:chemical synthesis*; D006863:Hydrogen-Ion Concentration; D008422:Materials Testing; D054802:Molecular Imprinting / Q000379:methods; D010316:Particle Size; D013634:Tannins / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
chemical_list: D002214:Capsules; D003692:Delayed-Action Preparations; D013634:Tannins; D014025:Titanium; D002119:Calcium Carbonate
keywords: enzyme catalysis; hybrid materials; metal−organic coordination; microcapsules; weak pH-response