ADVANCED MATERIALS
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2025
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IF 26.8
Yang Zong,Minjie Xi,Yunqi Wang,Guohonghao Zeng,Dongliang Hu,Huihui Hu,Xiaoqi Hou,Kewang Nan,Xiangzhong Chen,Fan Xu,Oliver G. Schmidt,Yongfeng Mei,Jizhai Cui
Precisely capturing and manipulating microscale objects, such as individual cells and microorganisms, is fundamental to advancements in biomedical research and microrobotics. Photoactuators based on optical fibers serving as flexible, unobstructed waveguides are well-suited for these operations, particularly in confined locations where free-space illumination is impractical. However, integrating optical fibers with microscale actuators poses significant challenges due to size mismatch, resulting in slow responses inadequate for handling motile micro-objects. This study designs microactuators based on hydrogel/Au bilayer heterostructures that self-roll around a tapered optical fiber. This self-rolling mechanism enables the use of thin hydrogel layers only a few micrometers thick, which rapidly absorb and release water molecules during a phase transition. The resulting microactuators exhibit low bending stiffness and extremely fast responses, achieving large bending angles exceeding 800° within 0.55 s. Using this technique, this study successfully captures rapidly swimming Chlamydomonas and Paramecium, and demonstrates programmable non-reciprocal motion for effective non-contact manipulation of yeast cells. This approach provides a versatile platform for microscale manipulations and holds promise for advanced biomedical applications.
研究领域:
生物医学工程
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微纳米技术
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光学工程
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产品关联
DOI
PubMed
高影响因子
NATURE MATERIALS
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2025
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IF 38.5
Cheng Yue-Yu-Shan,Shi Xiaoming,Shu Liang,He Qingyu,Li Yizhe,Luo Jin,Wang Sixu,Liu Yi-Xuan,Liu Lisha,Wang Lizhong,Yang Ziqi,Li Wei,Zhang Xin,Wei Liyu,Dong Yongqi,Haigh Sarah J.,Hall David A.,Zhong Minlin,Luo Zhenlin,Li Qian,Huang Houbing,Zhang Shujun,Li Jing-Feng
Ferroelectric films with large and linear strains are crucial for precision microactuator applications, especially at high frequencies. However, existing strategies that rely on frequency- and temperature-dependent dynamics have had limited success in enhancing strain response under such conditions. Here, through promoted local strain fluctuation, we achieve an interlocked polar configuration in spin-coated epitaxial (K,Na)NbO 3 -based ferroelectric films. The films demonstrate high-frequency strains exceeding 1.1% with high linearity and stability even when measured at 10 5 Hz. The presence of interlocked monoclinic and tetragonal polar nanoregions boosts piezoelectric response by promoting polarization dynamics across a broad frequency range. Additionally, the interplay between two distinct polarization switching mechanisms, arising from different symmetries and boundary conditions, mutually compensates, contributing to the observed overall linearity. This approach presents a promising yet facile strategy for achieving ferroelectric films with reliable, large and linear strain across a wide high-frequency range.
研究领域:
材料科学
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凝聚态物理
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功能材料
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纳米材料
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电子器件
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）