Advanced Functional Materials

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  1. Strong Photoacoustic Signal Enhancement by Coating Gold Nanoparticles with Melanin for Biomedical Imaging

    Tatjana Repenko, Anne Rix, Alexander Nedilko, Jonas Rose, Alina Hermann, Rostislav Vinokur, Sheila Moli, Roberto Cao-Milàn, Martin Mayer, Gero von Plessen, Andreas Fery, Laura De Laporte, Wiltrud Lederle, Dmitry N. Chigrin and Alexander J. C. Kuehne

    Version of Record online: 15 DEC 2017 | DOI: 10.1002/adfm.201705607

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    Here, the preparation of melanin coated gold particles is presented. The melanin coating provides enhanced colloidal stability, improved biocompatibility, and augmented photoacoustic contrast. The reasons for these improvements are analyzed experimentally and theoretically and it is found that a thermal confinement effect leads to enhanced photothermal efficiency, which is exploited for intestinal photoacoustic imaging.

  2. Fully Reversible Multistate Fluorescence Switching: Organogel System Consisting of Luminescent Cyanostilbene and Turn-On Diarylethene

    Dojin Kim, Ji Eon Kwon and Soo Young Park

    Version of Record online: 15 DEC 2017 | DOI: 10.1002/adfm.201706213

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    Multistate addressable fluorescent organogel is constructed by mixing the aggregation-induced enhanced emission organogelator and fluorescent turn-on diarylethene. Through its reversible and orthogonal stimuli-responsiveness, an integrated logic circuit, where thermal- and optical-inputs can be translated into four different outputs (blue-emitting gel, nonemissive sol, green-emitting gel, and green-emitting sol), is demonstrated.

  3. Bio-Inspired Anisotropic Wettability Surfaces from Dynamic Ferrofluid Assembled Templates

    Luoran Shang, Yunru Yu, Wei Gao, Yuetong Wang, Liangliang Qu, Ze Zhao, Renjie Chai and Yuanjin Zhao

    Version of Record online: 15 DEC 2017 | DOI: 10.1002/adfm.201705802

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    An anisotropic wettability surface with Nepenthes peristome inspired structures is fabricated through dynamic ferrofluid assembly. It enables autonomous unidirectional water transportation and could be tailored into arbitrary shapes to induce water flow along a specific curved path. Novel pump-free microfluidic devices are constructed for multiphase flow reactions, which offer a promising solution in building low-cost, portable platform for lab-on-a-chip applications.

  4. Orthorhombic Ti2O3: A Polymorph-Dependent Narrow-Bandgap Ferromagnetic Oxide

    Yangyang Li, Yakui Weng, Xinmao Yin, Xiaojiang Yu, S. R. Sarath Kumar, Nimer Wehbe, Haijun Wu, Husam N. Alshareef, Stephen J. Pennycook, Mark B. H. Breese, Jingsheng Chen, Shuai Dong and Tom Wu

    Version of Record online: 15 DEC 2017 | DOI: 10.1002/adfm.201705657

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    Epitaxial Ti2O3 (Ti3+: 3d1) thin films on Sapphire are systematically investigated, and, more interestingly, a new stabilized orthorhombic phase is fabricated. Depending on extensive physical and optical properties measurements, the new orthorhombic Ti2O3 is confirmed to be a narrow band-gap (≈0.11 eV) n-type semiconductor with emergent ferromagnetism, while the corundum Ti2O3 is a p-type antiferromagnetic semiconductor with a trigonal structure.

  5. Functionally Antagonistic Hybrid Electrode with Hollow Tubular Graphene Mesh and Nitrogen-Doped Crumpled Graphene for High-Performance Ionic Soft Actuators

    Rassoul Tabassian, Jaehwan Kim, Van Hiep Nguyen, Moumita Kotal and Il-Kwon Oh

    Version of Record online: 15 DEC 2017 | DOI: 10.1002/adfm.201705714

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    A functionally antagonistic hybrid electrode is newly designed for an ionic soft actuator by combining tubular graphene mesh with nitrogen-doped crumpled graphene. The charges are swiftly transferred via highly conductive graphene mesh and stored on highly capacitive nitrogen-doped graphene flakes. Adding graphene mesh significantly enhances the electromechanical and electrochemical properties of the electrode and consequently improves the actuator performances.