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Soft Matter · 2011 ·Vol. 7 ·期 9 ·4156-4159 · IF 4.457

Amphoteric polymeric photonic crystal with U-shaped pH response developed by intercalation polymerization

Hongwei Xia,Junpeng Zhao,Cong Meng,Ying Wu,Yijie Lu,Jingxia Wang,Yanlin Song,Lei Jiang,Guangzhao Zhang

Amphoteric one-dimensional photonic crystal (PC) based on polystyrene-b-poly(2-vinyl pyridine) (PS-b-P2VP) block copolymer was developed by intercalation polymerization of acrylic acid and 2-hydroxyethyl methacrylate in the partly quaternized P2VP (QP2VP) layers. The amphoteric PC reversibly exhibits a high first Bragg peak position (λmax > 700 nm) at both acidic and basic pH values where the QP2VP layers are positively and negatively charged respectively. The minimum λmax (300 nm) at pH 5.5 can be observed due to charge screening. The PC with a U-shaped pH response also shows good durability.

研究领域: 材料科学 · 化学

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JOURNAL OF MOLECULAR LIQUIDS · 2024 · IF 5.3

Assembly of large-area helical nanowire and nanosphere superstructures by PS-b-P2VP/S-mandelic acid via interfacial nanoarchitectonics

Hongmin Zhang,Xiaotong Yang,Xiaona Cui,Hejie Wang,Aixin Song,Xiao Chen,Hong-Guo Liu

Chiral supramolecules have attracted great research interest due to their unique properties and functions. How to assemble them into the ordered superstructures, however, remains a challenge. In this paper, two methods have been developed to fabricate such superstructures. In method I, polystyrene- b -poly (2-vinylpyridine) (PS- b -P2VP) and S-mandelic acid (S-MA) diffused from the oil and aqueous phases respectively to the oil/water interface, combined and self-assembled into helical nanowires and nanospheres with monochirality, and formed parallel-aligned nanowire arrays and close-packed arrays at the liquid/liquid interface. In method II, PS- b -P2VP in DMF droplets was introduced into the aqueous solution of S-MA through a liquid/liquid interfacial phase transfer process. Then the polymer molecules self-assembled into helical nanowires and nanospheres with monochirality in the aqueous phase, which adsorbed at the air/liquid interface and organized into superstructures. The formation of chiral aggregates should be attributed to the induction of S-MA, while the superstructures at the interfaces were considered to result from the modulation by the interfacial pressures. This study has developed one-step techniques to assemble the chiral aggregates and superstructures, which is expected to become universal for fabrication of functional superstructures.

CAS / MDL: 17199-29-0

研究领域: 材料科学 · 纳米技术 · 化学

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Amphoteric polymeric photonic crystal with U-shaped pH response developed by intercalation polymerization

Assembly of large-area helical nanowire and nanosphere superstructures by PS-b-P2VP/S-mandelic acid via interfacial nanoarchitectonics