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Lightweight,strong and High Heat-Resistant Poly(lactide acid)Foams via Microcellular Injection Molding with self-Assembly Nucleating Agent

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Chinese Journal of Polymer science 2024年第6期42卷 739-750页

作者： Xiao-Hu Bing Wen-Yu Ma Ming-Hui Wu Peng Gao Xiao Zhou Hai-Bin Luo Long Wang Wen-Ge Zheng school of materials science and Engineering Shanghai UniversityShanghai200444China ningbo Key Lab of Polymer Materials Ningbo Institute of Material Technology and EngineeringChinese Academy of SciencesNingbo315201China University of Chinese Academy of sciences Beijing100049China

Poly(lactide acid)(PLA)foams have shown considerable promise as eco-friendly alternatives to nondegradable plastic foams,such as polystyrene(Ps)foams.Nevertheless,PLA foam typically suffers from low heat-resistance and poor cellular structure stemming from its inherent slow crystallization rate and low melt strength.In this study,a high-performance PLA foam with well-defined cell morphology,exceptional strength and enhanced heat-resistance was successfully fabricated via a core-back microcellular injection molding(MIM)process.Differential scanning calorimetry(DsC)results revealed that the added hydrazine-based nucleating agent(HNA)significantly increased the crystallization temperature and accelerated the crystallization process of PLA.Remarkably,the addition of a 1.5 wt%of HNA led to a significant reduction in PLA’s cell size,from 43.5µm to 2.87µm,and a remarkable increase in cell density,from 1.08×10^(7)cells/cm^(3)to 2.15×10^(10)cells/cm^(3).this enhancement resulted in a final crystallinity of approximately 55.7%for the PLA blend foam,a marked improvement compared to the pure PLA foam.Furthermore,at 1.5 wt%HNA concentration,the tensile strength and tensile toughness of PLA blend foams demonstrated remarkable improvements of 136%and 463%,respectively.Additionally,the Vicat softening temperature of PLA blend foam increased significantly to 134.8°C,whereas the pure PLA foam exhibited only about 59.7℃.these findings underscore the potential for the preparation of lightweight injection-molded PLA foam with enhanced toughness and heat-resistance,which offers a viable approach for the production of high-performance PLA foams suitable for large-scale applications.

关键词： Poly(lactide acid) Nucleating agent Microcellular injection molding Heat-resistance toughness

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Highly efficient ternary organic solar cells with excellent open-circuit voltage and fill factor via precisely tuning molecular stacking and morphology

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science China Chemistry 2024年第3期67卷 963-972页

作者： Dinghong sun Zhenyu Chen Jianfeng Zhang Wei song Jingyu shi Jintao Zhu Yuanyuan Meng Fei Jin shuncheng Yang Ziyi Ge Faculty of Electrical Engineering and Computer science Ningbo UniversityNingbo 315211China Faculty of Material science and Chemical Engineering Ningbo UniversityNingbo 315211China Zhejiang Provincial Engineering Research Center of Energy Optoelectronic Materials and Devices Ningbo Institute of Materials Technology&EngineeringChinese Academy of SciencesNingbo 315201China Center of Materials science and Optoelectronics Engineering University of Chinese Academy of sciences Beijing 100049China Department of Chemical and Environmental Engineering University of Nottingham NingboNingbo 315100China

the micro-morphology and molecular stacking play a key role in determining the charge transport process and nonradiative energy loss, thus impacting the performances of organic solar cells(OsCs). to address this issue, a non-fullerene acceptor PhC6-IC-F with alkylbenzene side-chain, possessing optimized molecular stacking, complementary absorption spectra and forming a cascade energy level alignment in the PM6:BtP-eC9 blend, is introduced as guest acceptor to improve efficiency of ternary OsCs. the bulky phenyl in the side-chain can regulate crystallinity and optimizing phase separation between receptors in ternary blend films, resulting in the optimal phase separations in the ternary films. As a result, high efficiencies of 18.33% as photovoltaic layer are obtained for PhC6-IC-F-based ternary devices with excellent fill factor(FF) of 78.92%. Impressively, the ternary system produces a significantly improved open circuit voltage(V_(oc)) of 0.857 V compared with the binary device,contributing to the reduced density of trap states and suppressed non-radiative recombination result in lower energy loss. this work demonstrates an effective approach for adjusting the aggregation, molecular packing and fine phase separation morphology to increase V_(oc) and FF, paving the way toward high-efficiency OsCs.

关键词： alkylbenzene side-chain morphology regulation ternary blends organic solar cells

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Remarkable enhancement of gas selectivity on organosilica hybrid membranes using urea-modulated metal-organic framework nanoparticles

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Frontiers of Chemical science and Engineering 2024年第2期18卷 83-92页

作者： Yayun Zhao Dechuan Zhao Chunlong Kong Yichao Lin Xuezhen Wang Liang Chen Key Laboratory of Advanced Fuel Cells and Electrolyzers technology of Zhejiang Province Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China University of Chinese Academy of sciences Beijing 100049China Collaboration innovation Center for tissue Repair Material Engineering technology China West Normal UniversityNanchong 637009China

Metal-organic framework/organosilica hybrid membranes on tubular ceramic substrates have shown great potential for the implementation of membrane technology in practical gas separation projects due to their higher permeance compared to commercial polymers.However,the selectivities of the reported membranes are moderate.Here,we have incorporated urea-modulated metal-organic frameworks into organosilica membranes to greatly enhance its separation performance.the urea-modulated metal-organic frameworks exhibit less-defined edges of crystallographic facets and high defect density.they can be well-dispersed in the organosilica layer,which substantially suppresses the interfacial defects between metal-organic frameworks and organosilica,which is beneficial for improving the selectivity of membranes for gas separation.the results have shown that the enhanced ideal selectivity of H_(2)/CH_(4) was 165 and that of CO_(2)/CH_(4) was 43,with H_(2) permeance of about 1.25×10^(−6) mol·m^(−2)·s^(−1)·Pa^(−1) and CO_(2) permeance of 3.27×10^(−7) mol·m^(−2)·s^(−1)·Pa^(−1) at 0.2 MPa and 25℃.In conclusion,the high level of hybrid membranes can be used to separate H_(2)(or CO_(2))from the binary gas mixture H_(2)/CH_(4)(or CO_(2)/CH_(4)),which is important for gas separation in practical applications.Moreover,the simple and feasible modulation of metal-organic framework is a promising strategy to tune different metal-organic frameworks for membranes according to the actual demands.

关键词： ZIF-8 nanocrystals urea organosilica hybrid membrane enhanced separation performance

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self-assembled interlayer aiming at the stability of NiOx based perovskite solar cells

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Journal of Energy Chemistry 2022年第6期31卷 211-220,I0006页

作者： tonghui Guo Zhi Fang Zequn Zhang Zhiqiang Deng Rui Zhao Jing Zhang Minghui shang Xiaohui Liu Ziyang Hu Yuejin Zhu Liyuan Han Department of Microelectronic science and Engineering Ningbo UniversityNingbo 315211ZhejiangChina school of Materials science and Engineering Ningbo University of TechnologyNingbo 315016ZhejiangChina state Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240China

Inorganic NiO_(x) based inverted structure perovskite solar cells (PsCs) is reported to be more stable than that with the organic hole transport materials.In this work,NiO_(x)/MAPbI_(3) interface chemical reaction induced instability of perovskite is unveiled:Ni^(3+) and I^(-) exhibit redox reactions and deprotonation of MA^(+) happens,which result in interface defects and perovskite lattice deformation.thus the defective interface accelerates the degradation of perovskite by defect pathways from the bottom interface to the perovskite surface contacting H_(2)O/O_(2).self-assembled interlayer of NH_(2)^(-)end silane on NiO_(x)separates the reactive NiO_(x)and MAPbI_(3),tunes the interface energy states by–NH_(2) end group.As a result,the PsC based on the silane treated NiO_(x)achieves enhanced PCE of 20.1%with decent stability under environmental and extreme conditions (high temperature,high humidity,light infiltration).Our work highlights the interface chemical problem induced PsC instability and a simple interface modification to achieve the stable PsCs.

关键词： Perovskite solar cells Interface chemical problem NiOx hole transport material self assemble stability

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Biomass-based aligned carbon networks with double-layer construction for tunable electromagnetic shielding with ultra-low reflectivity

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Journal of Materials science & technology 2022年第8期103卷 98-104页

作者： Jiali Chen Da Yi Xichen Jia Guoqing Wang Zhouping sun Lihua Zhang Yinfeng Liu Bin shen Wenge Zheng school of Materials science and Engineering Shanghai UniversityShanghai 200444China ningbo Key Lab of Polymer Materials Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China College of Microelectronics and Communication Engineering Chongqing UniversityChongqing 400044China

Nowadays,carbon frameworks derived from natural biomaterials have attracted extensive attention for electromagnetic interference(EMI)shielding due to their renewability and affordability.However,it is critical and challenging to achieve effective regulation of shielding effectiveness(sE)as well as weaken the strong EM reflection of highly conductive biomass-based carbon materials.Herein,commercial cotton pads with oriented structure were selected as carbonaceous precursor to fabricate aligned carbon networks by pyrolysis,and the EMI sE of the samples with increased temperature of 800-1000℃ can be accurately controlled in the effective range of~21.7-29.1,~27.7-37.1 and~32.7-43.3 d B with high reflection coefficient of>0.8 by changing the cross-angle between the electric-field direction of incident EM waves and the fiber-orientation direction due to the occurrence of opposite internal electric field.Moreover,the further construction of salisbury absorber-liked double-layer structure could result in an ultralow reflection coefficient of only~0.06 but enhanced sE variation range up to~38.7-49.3 d B during the adjustment of cross-angle,possibly due to the destructive interference of EM waves in the double-layer carbon networks.this work would provide a simple and effective way for constructing high-performance biomass carbon materials with adjustable EMI shielding and ultra-low reflectivity.

关键词： Aligned carbon networks Double-layer construction tunable electromagnetic shielding Ultra-low reflectivity

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Enabling robust and hour-level organic long persistent luminescence from carbon dots by covalent fixation

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Light(science & Applications) 2022年第4期11卷 686-696页

作者： Kai Jiang Yuci Wang Cunjian Lin Licheng Zheng Jiaren Du Yixi Zhuang Rongjun Xie Zhongjun Li Hengwei Lin International Joint Research Center for Photo-responsive Molecules and Materials School of Chemical and Material EngineeringJiangnan University214122 WuxiChina College of Chemistry Zhengzhou University450001 ZhengzhouChina state Key Laboratory of Physical Chemistry of solid surface Fujian Provincial Key Laboratory of Materials Genomeand College of MaterialsXiamen University361005 XiamenChina

the first carbon dot(CD)-based organic long persistent luminescence(OLPL)system exhibiting more than 1 h of duration was developed.In contrast to the established OLPL systems,herein,the reported CDs-based system(named m-CDs@CA)can be facilely and effectively fabricated using a household microwave oven,and more impressively,its LPL can be observed under ambient conditions and even in aqueous media.XRD and tEM characterizations,afterglow decay,time-resolved spectroscopy,and EsR analysis were performed,showing the successful composition of CDs and.CA,the formation of exciplexes and long-lived charged-separated states.Further studies suggest that the production of covalent bonds between CA and CDs plays pivotal roles in activating LPL and preventing its quenching from oxygen and water.to the best of our knowledge,this is a very rare example of an OLPL system that exhibits hourlevel afterglow under ambient conditions.Finally,applications of m-CDs@C.A in glow-in-the-dark paints for emergency signs and multicolored luminous pearls were preliminarily demonstrated.this work may provide new insights for the development of rare earth-free and robust OLPL materials.

关键词： luminescence system ambient

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Bioinspired MXene-Based User-Interactive Electronic skin for Digital and Visual Dual-Channel sensing

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Nano-Micro Letters 2022年第7期14卷 228-245页

作者： Wentao Cao Zheng Wang Xiaohao Liu Zhi Zhou Yue Zhang shisheng He Daxiang Cui Feng Chen Department of Orthopedic School of MedicineSpinal Pain Research InstituteShanghai Tenth People’s HospitalTongji UniversityShanghai 200072People’s Republic of China National Engineering Research Center for Nanotechnology Shanghai 200241People’s Republic of China Institute of Micro-Nano science and technology School of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai 200240People’s Republic of China

User-interactive electronic skin(e-skin) that could convert mechanical stimuli into distinguishable outputs displays tremendous potential for wearable devices and health care applications. However, the existing devices have the disadvantages such as complex integration procedure and lack of the intuitive signal display function. Here, we present a bioinspired user-interactive e-skin, which is simple in structure and can synchronously achieve digital electrical response and optical visualization upon external mechanical stimulus. the e-skin comprises a conductive layer with a carbon nanotubes/cellulose nanofibers/MXene nanohybrid network featuring remarkable electromechanical behaviors, and a stretchable elastomer layer, which is composed of silicone rubber and thermochromic pigments. Furthermore, the conductive nanohybrid network with outstanding Joule heating performance can generate controllable thermal energy under voltage input and then achieve the dynamic coloration of silicone-based elastomer. Especially, such an innovative fusion strategy of digital data and visual images enables the e-skin to monitor human activities with evermore intuition and accuracy. the simple design philosophy and reliable operation of the demonstrated e-skin are expected to provide an ideal platform for next-generation flexible electronics.

关键词： MXene Electronic skin Electromechanical behavior Joule heating Visualization

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17.13% Efficiency and superior thermal stability of Organic solar Cells Based on a Comb-shape Active Blend

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Energy & Environmental Materials 2023年第6期6卷 266-272页

作者： Zhipeng Yin Qingjie Wang Huan Zhao Haiqiao Wang Ning Li Weijie song school of Materials science and Engineering NingboTech UniversityNingbo 315100China Zhejiang Provincial Engineering Research Center of Energy Optoelectronic Materials and Devices Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China state Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and DevicesSchool of Materials Science and EngineeringSouth China University of TechnologyGuangzhou 510640China

With rapid progress,organic solar cells(OsCs)are getting closer to the target of real application.However,the stability issue is still one of the biggest challenges that have to be resolved.Especially,the thermal stability of OsCs is far from meeting the requirements of the application.Here,based on the layer-by-layer(LBL)process and by utilizing the dissolubility nature of solvent and materials,binary inverted OsCs(ItO/AZO/PM6/BtP-eC9/MoO3/Ag)with comb shape active morphology are fabricated.High efficiency of 17.13%and simultaneous superior thermal stability(with 93%of initial efficiency retained in~9:00 h under 85℃in N_(2))are demonstrated,showing superior stability to reference cells.the enhancements are attributed to the formed optimal comb shape of the active layer,which could provide a larger D/A interface,thus more charge carriers,render the active blend a more stable morphology,and protect the electrode by impeding ion's migration and corrosion.to the best of our knowledge,this is the best thermal stability of binary OsCs reported in the literature,especially when considering the high efficiency of over 17%.

关键词： comb-shape blend high efficiency organic solar cell thermal stability

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Ferric oxide nanosheet-engineered Mg alloy for synergetic osteosarcoma photothermal/chemodynamic therapy

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Journal of Materials science & technology 2023年第7期138卷 203-213页

作者： Huihui Du Dongdong Zhang Ru Xu Juning Xie shiwei Guan shuhan Chen Feng Peng shi Qian Xuanyong Liu state Key Laboratory of High Performance Ceramics and superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Center of Materials science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Medical Research Center Department of OrthopedicsGuangdong Provincial People’s HospitalGuangdong Academy of Medical SciencesGuangzhou 510080China Cixi Center of Biomaterials surface Engineering Ningbo 315300China school of Chemistry and Materials science Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of Sciences1 Sub-lane XiangshanHangzhou 310024China

Osteosarcoma(Os)is a malignant tumor with a high rate of recurrence.Recently,biodegradable Mg-based implants have become a new therapeutic platform for bone-related diseases.However,poor biosafety and deficient intelligent tumor-killing ability of Mg-based implants are still the main challenges for the pre-cise treatment of Os.Herein,based on the excellent catalytic and photothermal conversion properties of nanozyme ferric oxide(Fe_(3)O_(4)),a novel two-step hydrothermal method for in situ preparation of Fe_(3)O_(4)nanosheets on the surface of plasma electrolytic oxidation(PEO)-treated Mg alloy using Mg-Fe layered double hydroxides(Mg-Fe LDH)as precursor was proposed.Compared with Mg alloy,there were no obvious corrosion cracks on the surface of Fe_(3)O_(4)nanosheets-coated Mg alloy(Fe_(3)O_(4)-Ns)immersed in 0.9 wt.%NaCl for 14 days,which demonstrated the corrosion resistance of Mg alloy was significantly enhanced.Cytocompatibility experiments and hemolysis assay confirmed the great biocompatibility of Fe_(3)O_(4)-Ns,especially,hemolysis ratio was lower than 1%.Meanwhile,Fe_(3)O_(4)-Ns presented excellent cat-alytic oxidation capacity in the presence of H_(2)O_(2),and its temperature can significantly increase from 27℃to approximately 56℃under NIR irradiation.therefore,intelligent responsive Fe_(3)O_(4)nanosheets-engineered Mg-based implants demonstrated excellent antitumor properties in vivo and in vitro due to their photothermal and chemodynamic synergetic effects.this study provides a novel approach for the preparation of Fe_(3)O_(4)coatings on the surface of Mg alloys and a new strategy for the treatment of Os.

关键词： Mg alloy Fe_(3)O_(4)nanosheets Photothermal effect Chemodynamic therapy Antitumor

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Chitosan@Puerarin hydrogel for accelerated wound healing in diabetic subjects by miR-29ab1 mediated inflammatory axis suppression

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Bioactive Materials 2023年第1期19卷 653-665页

作者： Xiaoling Zeng Baohui Chen Luping Wang Yingxiao sun Zhao Jin Xuanyong Liu Liping Ouyang Yun Liao Department of Pharmacy Tongren HospitalShanghai Jiao Tong University School of MedicineShanghai200336China state Key Laboratory of High Performance Ceramics and superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai200050China Center of Materials science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049China Hongqiao International Institute of Medicine Shanghai Jiao Tong University School of MedicineShanghai200336China school of Chemistry and Materials science Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of Sciences1 Sub-lane XiangshanHangzhou310024China Cixi Center of Biomaterials surface Engineering Shanghai Institute of CeramicsChinese Academy of SciencesNingbo315300China

Wound healing is one of the major global health concerns in patients with diabetes.Overactivation of pro-inflammatory M1 macrophages is associated with delayed wound healing in diabetes.miR-29ab1 plays a critical role in diabetes-related macrophage inflammation.Hence,inhibition of inflammation and regulation of miR-29 expression have been implicated as new points for skin wound healing.In this study,the traditional Chinese medicine,puerarin,was introduced to construct an injectable and self-healing chitosan@puerarin(C@P)hydrogel.the C@P hydrogel promoted diabetic wound healing and accelerated angiogenesis,which were related to the inhibition of the miR-29 mediated inflammation response.Compared to healthy subjects,miR-29a and miR-29b1 were ectopically increased in the skin wound of the diabetic model,accompanied by upregulated M1-polarization,and elevated levels of IL-1βand tNF-α.Further evaluations by miR-29ab1 knockout mice exhibited superior wound healing and attenuated inflammation.the present results suggested that miR-29ab1 is essential for diabetic wound healing by regulating the inflammatory response.suppression of miR-29ab1 by the C@P hydrogel has the potential for improving medical approaches for wound repair.

关键词： Hydrogel Diabetic skin wound healing Macrophages miR-29ab1

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