Chitin is a thermostable biopolymer found in various inorganic-organic skeletal structures of numerous invertebrates including sponges （Porifera）. The occurrence of chitin within calcium- and silica-based biomineral...Chitin is a thermostable biopolymer found in various inorganic-organic skeletal structures of numerous invertebrates including sponges （Porifera）. The occurrence of chitin within calcium- and silica-based biominerals in organisms living in extreme natural conditions has inspired development of new （extreme biomimetic） synthesis route of chitin-based hybrid materials in vitro. Here, we show for the first time that 3D-a-chitin scaffolds isolated from skeletons of the marine sponge Aplysina aerophoba can be effectively mineralized under hydrothermal conditions （150℃） using ammonium zirconium（IV） carbonate as a precursor of zirconia. Obtained chitin-ZrO2 hybrid materials were characterized by FT-IR, SEM, HRTEM, as well as light and confocal laser microscopy. We suggest that formation of chitin-ZrO2 hybrids occurs due to hydrogen bonds between chitin and ZrO2.展开更多
Composites containing biological materials with nanostructured architecture have become of great interest in modem materials science, yielding both interesting chemical properties and inspiration for biomimetic resear...Composites containing biological materials with nanostructured architecture have become of great interest in modem materials science, yielding both interesting chemical properties and inspiration for biomimetic research. Herein, we describe the preparation of a novel three-dimensional （3D） nanostructured MnO2-based com- posite developed using a carbonized proteinaceous spongin template by an extreme biomimetics approach. The thermal stability of the spongin-based scaffold fadlitated the formation of both carbonized material （at 650 ℃ with exclusion of oxygen） and manganese oxide with a defined nanoscale structure under 150 ℃. Remarkably, the unique network of spongin fibers was maintained after pyrolysis and hydro^ermal processing, yielding a novel porous support. The MnO2-spongin composite shows a bimodal pore distribution, with macropores originating from the spongin network and mesopores from the nanostructured oxidic coating. Interestingl3~ the composites also showed improved electrochemical properties compared to those of Mno2. Voltammetry cycling demonstrated the good stability of the material over more than 3,000 charging/discharging cydes. Additionally, electrochemical impedance spectroscopy revealed lower charge transfer resistance in the prepared materials. We demonstrate the potential of extreme biomimetics for developing a new generation of nanostructred materials with 3D centimeter-scale architecture for the storage and conversion of energy generated from renewable natural sources.展开更多
文摘Chitin is a thermostable biopolymer found in various inorganic-organic skeletal structures of numerous invertebrates including sponges （Porifera）. The occurrence of chitin within calcium- and silica-based biominerals in organisms living in extreme natural conditions has inspired development of new （extreme biomimetic） synthesis route of chitin-based hybrid materials in vitro. Here, we show for the first time that 3D-a-chitin scaffolds isolated from skeletons of the marine sponge Aplysina aerophoba can be effectively mineralized under hydrothermal conditions （150℃） using ammonium zirconium（IV） carbonate as a precursor of zirconia. Obtained chitin-ZrO2 hybrid materials were characterized by FT-IR, SEM, HRTEM, as well as light and confocal laser microscopy. We suggest that formation of chitin-ZrO2 hybrids occurs due to hydrogen bonds between chitin and ZrO2.
文摘Composites containing biological materials with nanostructured architecture have become of great interest in modem materials science, yielding both interesting chemical properties and inspiration for biomimetic research. Herein, we describe the preparation of a novel three-dimensional （3D） nanostructured MnO2-based com- posite developed using a carbonized proteinaceous spongin template by an extreme biomimetics approach. The thermal stability of the spongin-based scaffold fadlitated the formation of both carbonized material （at 650 ℃ with exclusion of oxygen） and manganese oxide with a defined nanoscale structure under 150 ℃. Remarkably, the unique network of spongin fibers was maintained after pyrolysis and hydro^ermal processing, yielding a novel porous support. The MnO2-spongin composite shows a bimodal pore distribution, with macropores originating from the spongin network and mesopores from the nanostructured oxidic coating. Interestingl3~ the composites also showed improved electrochemical properties compared to those of Mno2. Voltammetry cycling demonstrated the good stability of the material over more than 3,000 charging/discharging cydes. Additionally, electrochemical impedance spectroscopy revealed lower charge transfer resistance in the prepared materials. We demonstrate the potential of extreme biomimetics for developing a new generation of nanostructred materials with 3D centimeter-scale architecture for the storage and conversion of energy generated from renewable natural sources.
