可调 Yolk@Shell Polydopamine@Mesoporous Silica 纳米结构的温控核心溶胀和不对称收缩,Small

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可调 Yolk@Shell Polydopamine@Mesoporous Silica 纳米结构的温控核心溶胀和不对称收缩
Small ( IF 13.0 ) Pub Date : 2022-11-18 , DOI: 10.1002/smll.202205576
Minghang Qiao ₁ , Yi Xing ₁ , Lei Xie ₂ , Biao Kong ₂ , Freddy Kleitz ₃ , Xiaoyu Li _{4,

5} , Xin Du ₁

Affiliation

具有可调内核（'蛋黄'）和中孔壳的功能性 yolk@shell 结构纳米球的简便可控合成是非常理想的，但它仍然是一个巨大的挑战。在此，xx 开发了一种基于聚多巴胺 (PDA) 纳米球的温度调节溶胀和受限不对称收缩，并结合异质界面自组装生长的策略。这种方法可以简单而通用地制备 PDA@mesoporous silica (MS) 纳米球，该纳米球具有可调的 yolk@shell 结构和壳孔径。通过 PDA 纳米球的反应温度调节溶胀度和受限收缩，PDA 核占据的空腔的体积比可以很容易地从 ca 调整。2/3 至约 1/2，然后到 ca。2/5，终于到 ca。1/3。由于具有出色光热转换能力的 PDA 的存在，具有不对称蛋黄分布的 PDA@MS 纳米复合材料可以成为由近红外 (NIR) 光驱动的胶体纳米马达。值得注意的是，具有一半 PDA 蛋黄和硅胶壳微裂纹的 PDA@MS 达到 2.18 µm^{在 1.0 W cm -2} NIR 光存在下，有效扩散系数 (De) 为² s ^{-1 。}这种温度控制的溶胀方法可以为基于 PDA 的功能性 yolk@shell 结构纳米复合材料的设计和简便制备提供新的见解，以广泛应用于生物学和医学。

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Temperature-Regulated Core Swelling and Asymmetric Shrinkage for Tunable Yolk@Shell Polydopamine@Mesoporous Silica Nanostructures

Facile and controllable synthesis of functional yolk@shell structured nanospheres with a tunable inner core (‘yolk') and mesoporous shell is highly desirable, yet it remains a great challenge. Herein, xx developed a strategy based on temperature-regulated swelling and restricted asymmetric shrinkage of polydopamine (PDA) nanospheres, combined with heterogeneous interface self-assembly growth. This method allows a simple and versatile preparation of PDA@mesoporous silica (MS) nanospheres exhibiting tunable yolk@shell architectures and shell pore sizes. Through reaction temperature-regulated swelling degree and confined shrinkage of PDA nanospheres, the volume ratio of the hollow cavity that the PDA core occupies can easily be tuned from ca. 2/3 to ca. 1/2, then to ca. 2/5, finally to ca. 1/3. Owing to the presence of PDA with excellent photothermal conversion capacity, the PDA@MS nanocomposites with asymmetric yolk distributions can become a colloidal nanomotor propelled by near-infrared (NIR) light. Noteworthily, the PDA@MS with half PDA yolk and microcracks in silica shell reaches 2.18 µm² s⁻¹ of effective diffusion coefficient (De) in the presence of 1.0 W cm⁻² NIR light. This temperature-controlled swelling approach may provide new insight into the design and facile preparation of functional PDA-based yolk@shell structured nanocomposites for wide applications in biology and medicine.

更新日期：2022-11-18

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