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Helical supramolecular nanorods via sequential meticulous tailoring of noncovalent interaction and light irradiation

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Science China Chemistry 2022年第9期65卷 1749-1757页

作者： Zhenghui Liu Yuan Yao Xinfeng Tao Jie Wei Shaoliang Lin Shanghai key laboratory of Advanced Polymeric materials Key Laboratory for Ultrafine Materials of Ministry of EducationSchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China

Polymers are widely recognized to entail random conformations in good solvent governed by the need for achieving the highest entropy to reach thermodynamic equilibrium.In this context,it remains grand challenging to directly arrange them into ordered conformation as building blocks for further self-assembling into hierarchal structures.Herein,we report a simple yet viable strategy to progressively assemble rationally designed azobenzene-containing alternating copolymer(i.e.,poly(binaphthylspacer-azobenzene-alt-hexaethylene glycol),denoting P(BNPSAzo-alt-EG_(6))_(24))into helical supramolecular nanorods.Specifically,P(BNPSAzo-alt-EG_(6))_(24) chains in good solvent are firstly self-assembled into helical single molecular micelles in good solvent via intramolecular π-π interaction between binaphthyl groups as well as between azobenzene moieties.Subsequently,by simply introducing water into the solution that is allowed to dwell for a certain period of time,single molecular micelles are selfassembled into well-defined vesicles.Finally,these isotropic vesicles could be further transformed into anisotropic helical supramolecular nanorods with enhanced aggregate-induced emission(AIE)capability driven by repeated,light-triggered cistrans isomerization of azobenzene moieties with the retention of π-π interacted binaphthyl groups.This study highlights a facile route to yielding morphology-rich,functional assemblies from a single polymer via judiciously exploiting non-covalent interaction and light of different wavelength as highly effective trigger in a non-invasive manner for potential applications in controlled release and fluorescent labelling.

关键词： alternating polymer conformational organization assembly chirality transmission light response azobenzene

A one-pot method for controlled synthesis and selective etching of organic-inorganic hybrid perovskite crystals

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Journal of Energy Chemistry 2019年第6期28卷 149-154页

作者： Yu Hou Mengjiong Chen Hongwei Qiao Huagui Yang Key Laboratory for Ultrafine Materials of Ministry of Education School of Materials Science and Engineering East China University of Science and Technology

Organometal halide perovskites have recently emerged with a huge potential for photovoltaic applications. Moreover, preparation of high-quality perovskite crystals with controlled morphology is of great significance for the fundamental studies such as optical and electrical properties, as well as the applications. Here, we report a one-pot solvothermal process to synthesize sheet-shaped CH3NH3PbBr3 single crystals with the lateral size of 100 μm and the thickness of 3–8 μm. Furthermore, a controlled etching behavior on the crystalline surface was demonstrated, which could be the irregular collapse of the crystalline surface caused by the local accumulation of methylammonium cations. Using this technique,CH3NH3PbBr3 single crystal sheets could be used in the various optoelectronic devices, such as nanolaser,optical sensors, photodetectors and field effect transistors.

关键词： Crystal growth Perovskite Solvothermal Etching effect

Biofilm Disruption Utilizing α/β Chimeric Polypeptide Molecular Brushes

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Chinese Journal of Polymer Science 2019年第11期37卷 1105-1112页

作者： Si Zhang Xi-Mian Xiao Fan Qi Peng-Cheng Ma Wei-Wei Zhang Cheng-Zhi Dai Dan-Feng Zhang Run-Hui Liu State key laboratory of Bioreactor Engineering Key Laboratory for Ultrafine Materials of Ministry of Education Research Center for Biomedical Materials of Ministry of Education School of Materials Science and Engineering East China University of Science and Technology

Gram-negative bacteria can cause serious infections and are well known problems in biomedical practices. Biofilms of gramnegative bacteria are notorious for their frequently encountered resistance toward antibiotics. We demonstrate that α/β chimeric polypeptide molecular brush (α/β CPMB) exerts potent activities against antibiotic-resistant gram-negative bacteria. MTT viability assay, bacterial colony counting, and live/dead staining all indicate that α/β CPMB not only inhibits biofilm formation of gram-negative Pseudomonas aeruginosa and Acinetobacter baumannii, but also effectively disrupts mature biofllms that are highly resistant to one of the most active antibiotics-colistin. The superior antibacterial performance of the α/β CPMB implies its potential topical applications in treating biofilms.

关键词： Molecular brush Chimeric polypeptide Biofilm Antimicrobial resistance Host defense peptide

Interface-strengthened CoP nanosheet array with Co2P nanoparticles as efficient electrocatalysts for overall water splitting

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Journal of Energy Chemistry 2019年第10期28卷 1-6页

作者： Yanping Hua Qiucheng Xu Yanjie Hu Hao Jiang Chunzhong Li Key Laboratory for Ultrafine Materials of Ministry of Education School of Materials Science and Engineering East China University of Science and Technology

Highly active and durable bifunctional electrocatalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) play a pivotal role in overall water splitting. Herein, we demonstrate the construction of interface-strengthened CoP nanosheet array with Co2P nanoparticles as such an electrocatalyst through a facile hydrothermal reaction and the subsequent phosphorization process. The twodimensional (2D) nanosheets with thickness of^55 nm expose a great number of active sites. The surface chemical state indicates that the strongly coupled CoP/Co2P electrocatalysts can adsorb or generate more targeted intermediates (e.g. OH- or OOH*) for both HER/OER. As a result, the CoP/Co2P electrocatalysts exhibit small overpotentials of 68 and 256 mV to drive 10 mA cm^-2 for HER and OER, respectively, outperforming most of the recently reported Co-based electrocatalysts. Furthermore, an alkaline electrolyzer assembled by using CoP/Co2P as both cathode and anode can achieve a current density of 10 mA cm^-2 at a low voltage of 1.57 V and work continuously for over 58 h. This work provides a feasible structural design for transition metal phosphides electrocatalysts with efficient and stable overall water splitting.

关键词： Interface strengthening Cobalt phosphide Electrocatalyst Water splitting

Surface-engineering of layered LiNi_(0.815)Co_(0.15)Al_(0.035)O_2 cathode material for high-energy and stable Li-ion batteries

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Journal of Energy Chemistry 2018年第2期27卷 559-564页

作者： Yugang Li Haifeng Yu Yanjie Hu Hao Jiang Chunzhong Li Key Laboratory for Ultrafine Materials of Ministry of Education & School of materials Science and Engineering East China University of Science and Technology

Surface engineering is an effective strategy to restrain the generation of rocksalt NiO phase on surface of layered LiNi0.815Co0.15Al0.035O2（NCA） primary nanoparticles, a representative Ni-rich layered oxides cathode materials. Herein, we demonstrate the kilogram-scale synthesis of few-layer reduced graphene oxide（rGO） conformably coated NCA primary nanoparticles cathode materials by a mechanical wet ball-milling strategy. The lightening rGO coating layer effectively avoids the direct contact of electrolyte and NCA with rapid electrons transfer. As a result, the as-obtained NCA@rGO hybrids with only 1.0 wt% rGO content can deliver a high specific capacity（196 mAh g-1 at 0.2 C） and fast charge/discharge capability（127 mAh g-1 at 5 C）, which is much higher than the corresponding NCA nanoparticles（95 mAh g-1 at 5 C）. Even after100 cycles at 1 C, 91.7% of initial reversible capacity is still maintained. Furthermore, a prismatic pouch cell（240 mAh） is also successfully assembled with the commercial graphite anode.

关键词： Layered materials Cathode Reduced graphene oxide Energy density Li-ion batteries

Decellularized extracellular matrix and mesenchymal stem cells promote recovery in traumatic brain injury by synergistically enhancing neurogenesis and attenuating neuroinflammation

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Journal of materials Science & Technology 2023年第7期138卷 17-28页

作者： Xuewei Zhang Bixue Wang Hua Hong Ying Wang Jiashang Liu Changsheng Liu Xi Chen Key Laboratory for Ultrafine Materials of Ministry of Education Frontiers Science Center for Materiobiology and Dynamic ChemistryEngineering Research Center for Biomaterials of Ministry of EducationSchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China

Damaged neurons and harsh microenvironments contribute to the injury cascades following traumatic brain injury(TBI).Mesenchymal stem cell(MSC)therapy is considered a viable choice for brain in-jury treatment;however,its clinical use is hindered by limited engraftment,low survival ratio,and uncontrolled differentiation.Herein,the decellularized brain extracellular matrix(dBECM)was prepared through a new method as a delivery system for MSCs.dBECM-based hydrogel with favorable biochem-ical and biomechanical features provides a microenvironment for MSCs in nerve repair.The MSCs-encapsulated dBECM-based hydrogel is shown to improve neuron compensation and structural regen-eration,alleviate neuroinflammation,and promote M1-to-M2 polarization of microglia.Our results first demonstrate that the combination of dBECM and MSCs is a critical vehicle to promote TBI repair from neurogenesis and immunoregulation,showing promise for the physiological recovery of neurogenic dis-eases and injuries.

关键词： ECM Stem cells Brain injury Neurogenesis Neuroinflammation

Comparative Study on Optical Properties and Scratch Resistance of Nanocomposite Coatings Incorporated with Flame Spray Pyrolyzed Silica Modified via in-situ Route and ex-situ Route

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Journal of materials Science & Technology 2016年第3期32卷 251-258页

作者： Yun Wang Ling Zhang Yanjie Hu Chunzhong Li Key Laboratory for Ultrafine Materials of Ministry of Education School of Materials Science and Engineering East China University of Science and Technology

A new type of transparent scratch resistant coatings including in-situ modified SiO2 （g-SiO2） in flame spray pyrolysis （FSP） process was prepared. The maximum content of g-SiO2 in the coating was 15 wt%, which is higher than that of SiO2 modified by traditional wet chemical route （I-SiO2, only 10 wt%）. The results of transmission electron microscopy have demonstrated that in-situ surface modified g-SiO2 particles dispersed well with smaller agglomerates in the final coating, which was much better than the particles modified via wet chemical route. Visible light transmittance and haze tests were introduced to characterize the optical quality of the films. All coatings were highly transparent with the visible light transmittance of above 80%, especially for coatings containing g-SiO2, which exhibited slightly higher visible light transmittance than l-SiO2 embedded one. The haze value of coatings incorporated with 15 wt% g-SiO2 was 1.85%, even lower than the coating with 5 wt% I-SiO2 （haze value of 2.09%）, indicating much better clarity of g-SiO2. The excellent optical property of g-SiO2 filled coatings was attributed to the good dispersion and distribution of particles. Nano-indention and nano-scratch tests were con- ducted to investigate the scratch resistance of coatings on nano-scale. The surface hardness of the coatings rose by 18% and 14%, and the average friction coefficient decreased by 15% and 11%, respectively, compared to the neat coat due to the addition of 10 wt% g-SiO2 and I-SiO2. The pencil hardness of the coating with 15 wt% g-SiO2 increased from 2B for the neat coating to 2H. However, the pencil hardness of coating with 10 wt% I-SiO2 was only H. The results showed that the g-SiO2 embedded coatings exhibited higher scratch resistance and better optical properties.

关键词： ln-situ modification Silica Coating Scratch resistance Optical property

Decellularized extracellular matrix scaffolds:Recent trends and emerging strategies in tissue engineering

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Bioactive materials 2022年第4期7卷 15-31页

作者： Xuewei Zhang Xi Chen Hua Hong Rubei Hu Jiashang Liu Changsheng Liu Key Laboratory for Ultrafine Materials of Ministry of Education Frontiers Science Center for Materiobiology and Dynamic ChemistryEngineering Research Center for Biomaterials of Ministry of EducationSchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai200237PR China

The application of scaffolding materials is believed to hold enormous potential for tissue regeneration.Despite the widespread application and rapid advance of several tissue-engineered scaffolds such as natural and synthetic polymer-based scaffolds,they have limited repair capacity due to the difficulties in overcoming the immunogenicity,simulating in-vivo microenvironment,and performing mechanical or biochemical properties similar to native organs/tissues.Fortunately,the emergence of decellularized extracellular matrix(dECM)scaffolds provides an attractive way to overcome these hurdles,which mimic an optimal non-immune environment with native three-dimensional structures and various bioactive components.The consequent cell-seeded construct based on dECM scaffolds,especially stem cell-recellularized construct,is considered an ideal choice for regenerating functional organs/tissues.Herein,we review recent developments in dECM scaffolds and put forward perspectives accordingly,with particular focus on the concept and fabrication of decellularized scaffolds,as well as the application of decellularized scaffolds and their combinations with stem cells(recellularized scaffolds)in tissue engineering,including skin,bone,nerve,heart,along with lung,liver and kidney.

关键词： Decellularization ECM 3D scaffolds Tissue regeneration Recellularization

Integrated Ni-P-S nanosheets array as superior electrocatalysts for hydrogen generation

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Green Energy & Environment 2017年第2期2卷 112-118页

作者： Haoxuan Zhang Haibo Jiang Yanjie Hu Hao Jiang Chunzhong Li Key Laboratory for Ultrafine Materials of Ministry of Education & School of materials Science and Engineering East China University of Science and Technology

Searching for efficient and robust non-noble electrocatalysts for hydrogen generation is extremely desirable for future green energy systems.Here, we present the synthesis of integrated Ni-P-S nanosheets array including Ni_2P and NiS on nickel foam by a simple simultaneous phosphorization and sulfurization strategy. The resultant sample with optimal composition exhibits superior electrocatalytic performance for hydrogen evolution reaction(HER) in a wide pH range. In alkaline media, it can generate current densities of 10, 20 and 100 mA cm^(-2) at low overpotentials of only-101.9,-142.0 and-207.8 mV with robust durability. It still exhibits high electrocatalytic activities even in acid or neutral media. Such superior electrocatalytic performances can be mainly attributed to the synergistic enhancement of the hybrid Ni-P-S nanosheets array with integration microstructure. The kind of catalyst gives a new insight on achieving efficient and robust hydrogen generation.

关键词： Nanosheets array Nickel phosphide Nickel sulfide Overpotential Hydrogen generation