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Synthesis and Characterization of Hydroxypropyl Cellulose from Bacterial Cellulose

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Chinese Journal of Polymer Science 2014年第4期32卷 439-448页

作者： Chun-tao Chen Yang Huang Chun-lin Zhu Ying Nie Jia-zhi Yang 孙东平 chemicobiology and functional Material institute School of Chemical EngineeringNanjing University of Science and Technology

Bacterial cellulose produced by Acetobacter xylinum has been reacted with propyleneoxide to synthesize hydroxypropyl cellulose （HPC） under different reaction conditions while diluted by toluene. The effects of mass ratio of bacterial cellulose to propyleneoxide, dilutability of toluene, reaction temperature （T） and time （t） were investigated by series of experiments. The degree of substitution （DS）, hydroxypropyl content （A） and yield （η） were compared. The optimized product exhibited cold-water solubility and hot-water gelatinization in aqueous medium. Further study was carried out with FTIR, TGA, XRD, SEM and 13C-NMR for characterization. The water/air contact angle measurement reveals that it is a good hydrophobic material with good mechanical properties.

关键词： Bacterial cellulose Hydroxypropylation HPC Hydrophobic Biocompatibility.

Graphene for gold extraction

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National Science Review 2022年第10期9卷 55-56页

作者： Kostya S.Novoselov institute for functional Intelligent materials National University of Singapore

Gold is a unique element,characterized not only by limited,though still reasonable,availability (useful for monetary applications) but also for its rather unique properties useful for many industries [1]:chemical inertness,high electrical conductivity,plasticity,etc.As gold reserves in Earth’s crust diminish with traditional minings’urban mining’that recycles gold from gold-containing wastes (such as electronic waste,e-waste) has emerged as an important supply method for gold sustainability [2].One critical step in such a recycling process is the use of an adsorbent to extract gold from e-waste leachate that contains complex metal elements.Therefore,the gold adsorbent should have a high extraction capacity,selectivity and,importantly,economic viability.Although many porous materials have been developed for gold extraction from e-waste [3-6],materials that show high gold extraction capacity with precise gold selectivity to ppm or even lower concentrations are highly required.

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A Liquid–Solid Interface-Based Triboelectric Tactile Sensor with Ultrahigh Sensitivity of 21.48 kPa-1

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Nano-Micro Letters 2022年第6期14卷 28-38页

作者： Jingya Liu Zhen Wen Hao Lei Zhenqiu Gao Xuhui Sun institute of functional Nano and Soft materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhou 215123People’s Republic of China

Traditional triboelectric tactile sensors based on solid–solid interface have illustrated promising application prospects through optimization approach.However,the poor sensitivity and reliability caused by hard contact-electrification still poses challenges for the practical applications.In this work,a liquid–solid interface ferrofluid-based triboelectric tactile sensor(FTTS)with ultrahigh sensitivity is proposed.Relying on the fluidity and magnetism of ferrofluid,the topography of microstructure can be flexibly adjusted by directly employing ferrofluid as triboelectric material and controlling the position of outward magnet.To date,an ultrahigh sensitivity of 21.48 k Pa;for the triboelectric sensors can be achieved due to the high spike microstructure,low Young’s modulus of ferrofluid and efficient solid–liquid interface contact-electrification.The detection limit of FTTS of 1.25 Pa with a wide detection range to 390 k Pa was also obtained.In addition,the oleophobic property between ferrofluid and poly-tetra-fluoro-ethylene triboelectric layer can greatly reduce the wear and tear,resulting in the great improvement of stability.Finally,a strategy for personalized password lock with high security level has been demonstrated,illustrating a great perspective for practical application in smart home,artificial intelligence,Internet of things,etc.

关键词： Ferrofluid Tactile sensor Triboelectric nanogenerator Microstructure Ultrahigh sensitivity

Perovskite-Inspired Lead-Free Ag2BiI5 for Self-Powered NIR-Blind Visible Light Photodetection

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Nano-Micro Letters 2020年第2期12卷 199-210页

作者： Vincenzo Pecunia Yue Yuan Jing Zhao Kai Xia Yan Wang Steffen Duhm Luis Portilla Fengzhu Li institute of functional Nano & Soft materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Soochow University

In recent years,solution-processible semiconductors with perovskite or perovskite-inspired structures have been extensively investigated for optoelectronic applications.In particular,silver-bismuth-halides have been identified as especially promising because of their bulk properties and lack of heavily toxic elements.This study investigates the potential of Ag2BiI5 for near-infrared(NIR)-blind visible light photodetection,which is critical to emerging applications(e.g.,wearable optoelectronics and the Internet of Things).Self-powered photodetectors were realized and provided a near-constant≈100 mA W−1 responsivity through the visible,a NIR rejection ratio of>250,a long-wavelength responsivity onset matching standard colorimetric functions,and a linear photoresponse of>5 orders of magnitude.The optoelectronic characterization of Ag2BiI5 photodetectors additionally revealed consistency with one-center models and the role of the carrier collection distance in self-powered mode.This study provides a positive outlook of Ag2BiI5 toward emerging applications on low-cost and low-power NIR-blind visible light photodetector.

关键词： Perovskite-inspired semiconductor Silver bismuth iodide Self-powered photodetector NIR-blind photodetector Visible light photodetector

酞菁铁纳米点用于化学催化-声动力肿瘤联合治疗

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Science China materials 2022年第9期65卷 2600-2608页

作者：龚越涵王咸文巩飞李光强杨雨琦侯林倩张桥刘庄程亮 institute of functional Nano&Soft materials(FUNSOM) Jiangsu Key Laboratory for Carbon-based Functional Materials and DevicesSoochow UniversitySuzhou 215123China

声动力疗法(SDT)是一种新型无创治疗方式,由于其较强的组织穿透深度和较高的安全性而受到广泛关注.然而,目前声敏剂仍存在声敏化效率低的局限性,从而限制了其治疗效果和生物应用.因此,开发安全高效的声敏剂至关重要.本文中,我们通过简... 详细信息

声动力疗法(SDT)是一种新型无创治疗方式,由于其较强的组织穿透深度和较高的安全性而受到广泛关注.然而,目前声敏剂仍存在声敏化效率低的局限性,从而限制了其治疗效果和生物应用.因此,开发安全高效的声敏剂至关重要.本文中,我们通过简便的高温有机相法合成了一种新型超小酞菁铁纳米点(FePc NDs)声敏剂用于化学催化与声动力联合肿瘤治疗.高温处理后酞菁铁结中的N-H键的增强导致其声敏化作用大幅度提高,在超声作用下产生大量单线态氧(^(1)O_(2)).此外,由于Fe的存在,FePc NDs还可以通过芬顿催化反应生成羟基自由基(·OH),进一步提高活性氧治疗水平.值得注意的是,经过聚乙二醇(PEG)修饰的FePc-PEG NDs通过尾静脉注射入小鼠体内后呈现出较好的肿瘤富集能力.在超声作用下,FePc-PEG NDs具有明显的细胞杀伤效果和肿瘤抑制作用.更重要的是,得益于超小纳米结构,FePc-PEG NDs更易于从体内代谢,未引起明显的生物毒性,证明其具有良好的生物安全性.在此研究中,FePc-PEG NDs做为一种高效低毒的新型声敏剂在肿瘤声动力治疗领域具有广阔的应用前景.

关键词： phthalocyanine iron nanodots sonosensitizers sonodynamic therapy chemodynamic therapy toxicity

Nanoparticle accumulation in liver may induce resistance to immune checkpoint blockade therapy

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Nano Research 2023年第4期16卷 5237-5246页

作者： Huaxing Dai Qianyu Yang Rong Sun Yue Zhang Qingle Ma Yifan Shen Beilei Wang Yitong Chen Jialu Xu Bo Tian Fang Xu Chao Wang institute of functional Nano&Soft materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123China

Despite immune checkpoint blockade(ICB)therapy has transformed cancer treatment,only 20.2%of these patients achieved a response.Understanding resistance mechanisms to ICB is important for the treatment of a wider population.In this work,we occasionally found that the silica nanoparticles(SiO_(2)NPs)accumulated in the liver can induce resistance to following ICB therapy to a subcutaneous tumor in mice.By analysis of T cells frequency,we uncovered that SiO_(2)NPs in the liver resulted in a siphoning of T cells from circulation to the liver by produced chemokines.In addition,liver immunosuppressive cells further inhibit the function and induce apoptosis of recruited T cells,leading to a systemic loss and reduced tumor infiltration of T cells,which contributes to poor responses to ICB therapy.However,such effect is not observed in poly(lactic-co-glycolic acid)(PLGA)NPs treated mice under the same conditions,likely due to their much lower immunogenicity in perturbing the liver immune microenvironment,indicating that cancer is not a local disease but an ecosystem that is linked to the distal environment.We further provide a new mechanism insight into ICB resistance induced by liver accumulation of nanoparticles.

关键词： liver induce resistance

Understanding the Impact of Fluorine Substitution on the Photovoltaic Performance of Block Copolymers

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Transactions of Tianjin University 2022年第5期28卷 406-413页

作者： Bin Li Siying Li Xue Yang Jianyu Yuan Jiangsu Key Laboratory for Carbon-Based functional materials and Devices Institute of Functional Nano and Soft MaterialsSoochow UniversitySuzhou 215123China

Fluorine substitution was applied to the donor and acceptor segments of block copolymers to understand the impact of molecular structure on photovoltaic block copolymers and explore efficient materials for single-component organic solar cells(SCOSCs).Along this line,three fluorinated block copolymers,namely PBDB-T-b-PTYF6,PM6-b-PTY6,and PM6-bPTYF6,derived from PBDB-T-b-PTY6 were designed and synthesized.The UV-Vis absorption,energy level,and thin-film morphology of these block copolymers were systematically characterized.All fluorinated block copolymers show narrow bandgap and improved crystallinity.An enhanced open-circuit voltage was observed in the SCOSC based on PM6-b-PTY6.However,SCOSCs based on all fluorinated block copolymers exhibited low short-circuit current due to energy level mismatch and therefore had low power conversion efficiency at around 4%.By contrast,the SCOSCs based on control block copolymer PBDB-T-b-PTY6 exhibited the highest power conversion efficiency approaching 10%,with a high short-circuit current of 18.57 mA/cm~2.Our study was the first to perform fluorination on photovoltaic block copolymers and provides insight into precisely controlling the polymer structure and understanding the structure-property relationship in SCOSCs based on block copolymers.

关键词： Block copolymer Fluorine substitution Single-component organic solar cells Morphology

Cobalt atoms dispersed on hierarchical carbon nitride support as the cathode electrocatalyst for high-performance lithium-polysulfide batteries

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Science Bulletin 2019年第24期64卷 1875-1880页

作者： Jialing Wu Junmei Chen Yang Huang Kun Feng Jun Deng Wei Huang Yunling Wu Jun Zhong Yanguang Li institute of functional Nano & Soft materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Soochow University

Lithium-sulfur batteries are promising candidates for next-generation energy storage but are confronted with several challenges. One of the possible solutions is to design proper cathode electrocatalysts to accelerate the redox interconversion of solvated polysulfide intermediates. Herein, we report cobalt atoms dispersed on hierarchical carbon nitride support as an effective cathode electrocatalyst for lithium-polysulfide batteries. The electrocatalyst material is prepared from the simple reaction between melamine and cyanuric acid in the presence of Co^2+, followed by the Ar annealing. The product has a unique hierarchical structure consisting of many thin and porous C3 N4 nanosheets finely dispersed with Co atoms. The atomic dispersion of Co species is confirmed by X-ray absorption experiments.Electrochemical measurements reveal that it can promote the interconversion of polysulfides. As a result,batteries using this cathode electrocatalyst achieve large capacity($1400 mAh/g at 1.6 mA/cm^2), good rate performance($800 mAh/g at 12.8 mA/cm^2) and impressive cycling stability under different current densities and different sulfur loadings.

关键词： Li-polysulfide battery Cathode electrocatalyst Carbon nitride Cobalt single atom

Narrowband blue emitter based on fused nitrogen/carbonyl combination with external quantum efficiency approaching 30%

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Science China Chemistry 2024年第1期67卷 351-359页

作者： Long Chen Jia-Heng Cai You-Jun Yu Yang-Kun Qu Sheng-Yi Yang Sheng-Nan Zou Rui-Hong Liu Dong-Ying Zhou Liang-Sheng Liao Zuo-Quan Jiang institute of functional Nano&Soft materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123China Macao institute of materials Science and Engineering Macao University of Science and TechnologyMacao 999078China

Multi-resonance thermally activated delayed fluorescence(MR-TADF)emitters can enable narrowband emission with high color purity and electroluminescence efficiency.Nitrogen/carbonyl(N/C=O)system is receiving increasing attention while the nitrogen/boron(N/B)system has been widely studied.Donor decoration is an effective approach for N/B type MR-TADF system but always leads to broadening and red-shifting of the emission band in N/C=O MR-TADF system.We attribute these unfavorable phenomena to the formation of intramolecular charge transfer between the MR-core and peripheral donors.To address this issue,we have developed a new strategy by decorating DMQAO(a fused N/C=O MR-core)with a triazine acceptor and a neutral terphenyl group to construct MTDMQAO and MBDMQAO,respectively.The introduction of the triazine acceptor not only realizes efficient narrowband emission in MTDMQAO,but also accelerates the reverse intersystem crossing process through enhanced spin-orbital coupling.As a result,MTDMQAO exhibits a significantly higher external quantum efficiency of 29.4%compared to the referent emitters,validating the rationality of our derivation strategy.This study highlights the potential of the N/C=O system for MR-TADF emitters and provides important insights for understanding the difference between N/B and N/C=O systems.

关键词： carbonyl group narrowband acceptor decoration thermally activated delayed fluorescence OLEDs