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  1. A 3D Real-Scale, Biomimetic, and Biohybrid Model of the Blood-Brain Barrier Fabricated through Two-Photon Lithography

    Attilio Marino, Omar Tricinci, Matteo Battaglini, Carlo Filippeschi, Virgilio Mattoli, Edoardo Sinibaldi and Gianni Ciofani

    Version of Record online: 14 DEC 2017 | DOI: 10.1002/smll.201702959

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    A 3D, real-scale, and biomimetic model of the blood-brain barrier (BBB) is proposed. Taking advantage of the two-photon lithography technique, an in vitro biohybrid dynamic BBB model is developed and fully characterized, aiming at obtaining a realistic tool for the testing of drug targeting and delivery at the level of the central nervous system.

  2. Direct Experimental Observation of Facet-Dependent SERS of Cu2O Polyhedra

    Jie Lin, Wei Hao, Yang Shang, Xiaotian Wang, Dengli Qiu, Guanshui Ma, Chao Chen, Shuzhou Li and Lin Guo

    Version of Record online: 14 DEC 2017 | DOI: 10.1002/smll.201703274

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    An intriguing facet-dependent surface enhanced Raman scattering effect is first validated based on three facet-defined Cu2O microcrystals. The work function of single Cu2O polyhedra is found to dominate the interfacial charge transfer process. Owing to its lowest work function, the {100}-facet can transfer enormous electrons from Cu2O to molecules, enabling the largest magnification of the molecular polarization.

  3. Shape-Controlled 3D Periodic Metal Nanostructures Fabricated via Nanowelding

    Zhi-Jun Zhao, Sang-Ho Shin, Dae-Geun Choi, Sang-Hu Park and Jun-Ho Jeong

    Version of Record online: 14 DEC 2017 | DOI: 10.1002/smll.201703102

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    A new method for fabricating 3D metal nanostructures based on nanoimprint lithography, electron-beam evaporation, and nanowelding is proposed. This method allows for the shape of the nanostructures to be controlled by adjusting the temperature for the nanowelding process.

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    Out-of-Plane 3D-Printed Microfibers Improve the Shear Properties of Hydrogel Composites

    Mylène de Ruijter, Andrei Hrynevich, Jodie N. Haigh, Gernot Hochleitner, Miguel Castilho, Jürgen Groll, Jos Malda and Paul D. Dalton

    Version of Record online: 14 DEC 2017 | DOI: 10.1002/smll.201702773

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    Melt electrowriting is used to direct-write poly(ε-caprolactone) fibers “out-of-plane” by design, to stabilize an existing structure in shear as part of a hydrogel–fiber composite. The stabilizing fibers (diameter = 13.3 ± 0.3 µm) are sinusoidally direct-written over an existing structure and then embedded within different hydrogels for performing rheological measurements.

  5. Well-Defined Cobalt Catalyst with N-Doped Carbon Layers Enwrapping: The Correlation between Surface Atomic Structure and Electrocatalytic Property

    Youkui Zhang, Yunxiang Lin, Hongliang Jiang, Chuanqiang Wu, Hengjie Liu, Changda Wang, Shuangming Chen, Tao Duan and Li Song

    Version of Record online: 14 DEC 2017 | DOI: 10.1002/smll.201702074

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    The correlation between surface atomic structure and electrocatalytic property for a cobalt-based ORR catalyst with N-doped carbon layers enwrapping is elaborately demonstrated via synchrotron radiation X-ray photoelectron spectroscopy, the soft X-ray absorption near-edge structure, and X-ray absorption fine structure, highlighting the importance of tuning the atomic structure of heterogenous catalysts via surface engineering.