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Science China(Technological Sciences) 2023年第5期66卷 1461-1470页

作者： XIANG Xin CHEN DongYun li najun XU QingFeng li Hua HE JingHui LU JianMei College of Chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou215123China

Although many superwetting materials have been designed for the treatment of oil-containing wastewater,separation strategies for oil-in-water systems containing bacteria have rarely been reported.Herein,poly(vinylidene difluoride)-and poly(lactic acid)-blended fibrous membranes loaded with silver and copper oxide nanoparticles were successfully prepared by a two-step method of electrostatic spinning and liquid-phase synthesis.The product membrane showed excellent super-oleophilic properties in air and hydrophobicity under oil.It could separate water-in-oil emulsion systems containing surfactants with an efficiency above90%.More importantly,the nanoparticle-loaded fibers were characterized by material degradability and slowly released ions.The fibers exhibited excellent antibacterial activities against both gram-positive and-negative bacteria.This work provides a feasible strategy for water-in-oil emulsion separation and bacterial treatment of wastewater.

关键词： emulsion separation antibacterial activity electrostatic spinning Ag nanoparticles

Selective separation of oil-in-water emulsion with high efficiency by bio-inspired Janus membrane

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Science China(Technological Sciences) 2021年第10期64卷 2211-2219页

作者： CAI YaHui CHEN DongYun li najun XU QingFeng li Hua HE JingHui LU JianMei College of Chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037China

The efficient and rapid separation of oil from stabilized oil-in-water emulsions with micro/nanometer size is a global challenge.Owing to the low oil content in oil-in-water emulsions,separating the oil by simply controlling the surface wettability is difficult.Controlling the pore size of the membrane surface to achieve separation will lead to a sharp decrease in flux.Herein,inspired by cell membrane transportation,a hydrophilic/hydrophobic bifunctional Janus membrane for stable oil-in-water separation was prepared by simple surface polymerization and vapor diffusion.The prepared Janus membrane contained a hydrophobic side and hydrophilic polyamine layer.When used for oil-in-water emulsion separation,the polyamine layer accumulated micro/nanometer oil droplets,forming an oil layer on the hydrophobic surface.Water was retained by the 1H,1H,2H,2H-perfluorooctyl trichlorosilane layer,allowing oil droplets to selectively permeate through the membrane,achieving the separation effect.As the pore size of the modified fabric was basically unchanged,the permeation flux was fast(1.53×10^(3) Lm^(−2) h^(−1)).Furthermore,the poly(N,N-dimethylaminoethyl methacrylate)layer destroyed the emulsion stability,making the emulsion droplets aggregate without affecting the separation efficiency with fast permeation flux.Therefore,the prepared bifunctional Janus membrane shows great potential for actual wastewater treatment.

关键词： bifunctional Janus membrane demulsification function oil-in-water emulsion separation superhydrophobicity/superoleophilicity surface chemistry

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深度学习在口腔医学影像中的应用与挑战

中国图象图形学报 2024年第3期29卷 586-607页

作者：赵阳李俊诚成博栋牛娜君王龙光高广谓施俊上海大学通信与信息工程学院上海200444 西安电子科技大学计算机科学与技术学院西安710000 南京医科大学口腔医学院南京210000 空军航空大学电子科学学院吉林130022 南京邮电大学先进技术研究院南京210003

口腔医学影像是进行临床口腔疾病检测、筛查、诊断和治疗评估的重要工具,对口腔影像进行准确分析对于后续治疗计划的制定至关重要。常规的口腔医学影像分析依赖于医师的水平和经验,存在阅片效率低、可重复性低以及定量分析欠缺的问题。... 详细信息

口腔医学影像是进行临床口腔疾病检测、筛查、诊断和治疗评估的重要工具,对口腔影像进行准确分析对于后续治疗计划的制定至关重要。常规的口腔医学影像分析依赖于医师的水平和经验,存在阅片效率低、可重复性低以及定量分析欠缺的问题。深度学习可以从大样本数据中自动学习并获取优良的特征表达,提升各类机器学习任务的效率和性能,目前已广泛应用于医学影像分析处理的各类任务之中。基于深度学习的口腔医学影像处理是目前的研究热点,但由于口腔医学领域内在的特殊性和复杂性,以及口腔医学影像数据样本量通常较小的问题,给深度学习方法在相关学习任务和场景的应用带来了新的挑战。本文从口腔医学影像领域常用的二维X射线影像、三维点云/网格影像和锥形束计算机断层扫描影像3种影像出发,介绍深度学习技术在口腔医学影像处理及分析领域应用的思路和现状,分析了各算法的优缺点及该领域所面临的问题和挑战,并对未来的研究方向和可能开展的临床应用进行展望,以助力智慧口腔建设。

关键词：深度学习口腔医学影像牙齿检测与分割龋齿检测计算机辅助诊断(CAD)

Pt–Pd bimetallic nanoparticles anchored on uniform mesoporous MnO_(2) sphere as an advanced nanocatalyst for highly efficient toluene oxidation

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Green Energy & Environment 2022年第6期7卷 1349-1360页

作者： Jiaqin He Dongyun Chen najun li Qingfeng Xu Hua li Jinghui He Jianmei Lu College of Chemistry Chemical Engineering and Materials ScienceCollaborative Innovation Center of Suzhou Nano Science and TechnologySoochow UniversitySuzhouJiangsu215123China

Improving catalytic performance is a yet still challenge in thermal catalytic oxidation.Herein,uniform mesoporous MnO_(2) nanospheresupported bimetallic Pt–Pd nanoparticles were successfully fabricated via a SiO_(2) template strategy for the total catalytic degradation of volatile organic compounds at low temperature.The introduction of mesopores into the MnO_(2) support induces a large specific surface area and pore size,thus providing numerous accessible active sites and enhanced diffusion properties.Moreover,the addition of a secondary noble metal can adjust the O_(ads)/O_(latt) molar ratios,resulting in high catalytic activity.Among them,the catalyst having a Pt/Pd molar ratio of 7:3 exhibits optimized catalytic activity at a weight hourly space velocity of 36,000 mL g^(-1) h^(-1),reaching 100%toluene oxidation at 175℃ with a lower activation energy(57.0 kJ mol^(-1))than the corresponding monometallic Pt or non-Pt-based catalysts(93.8 kJ mol^(-1) and 214.2 kJ mol^(-1)).Our findings demonstrate that the uniform mesoporous MnO_(2) nanosphere-supported bimetallic Pt–Pd nanoparticles catalyst is an effective candidate for application in elimination of toluene.

关键词： MnO_(2)nanospheres Mesoporous structure Pt-Pd bimetal VOCs oxidation

A mini-review on ZnIn_(2)S_(4)-Based photocatalysts for energy and environmental application

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Green Energy & Environment 2022年第2期7卷 176-204页

作者： Guping Zhang Hao Wu Dongyun Chen najun li Qingfeng Xu Hua li Jinghui He Jianmei Lu College of Chemistry Chemical Engineering and Materials ScienceCollaborative Innovation Center of Suzhou Nano Science and TechnologySoochow UniversitySuzhouJiangsu215123China

As one of the most attractive and eco-friendly technologies,semiconductor photocatalysis is demonstrated as a potential strategy to solve global energy shortage environmental pollution problems.Regarding semiconductor-based photocatalysts,Zinc indium sulfide(ZnIn_(2)S_(4)) with various morphological structures has become research hotspots owing to its superior visible light absorption,high chemical durability and low cost.Nevertheless,the photocatalytic activity of pristine ZnIn_(2)S_(4) is unsatisfactory due to limited range of visible light absorption and fast recombination rate of light-induced electrons and holes.Different modification strategies,such as metal deposition,element doping,vacancy engineering and semiconductor combination,have been systematically developed for enhancing the photocatalytic performance of ZnIn_(2)S_(4) materials.In order to promote further developments of ZnIn_(2)S_(4) in photocatalytic applications,this mini-review summarizes the progress of recent research works for the construction of highly activity ZnIn_(2)S_(4)-based photocatalysts for the first time.In addition,the typical applications of ZnIn_(2)S_(4)-based photocatalytic materials have been critically reviewed and described such as in hydrogen evolution from photocatalytic water splitting,carbon dioxide photoreduction,and treatment of water pollution.The current challenges and further prospects for the development of ZnIn_(2)S_(4) semiconductor photocatalysts are finally pointed out.

关键词： energy visible durability

A highly dispersed Pt/copper modified-MnO_(2)catalyst for the complete oxidation of volatile organic compounds:The effect of oxygen species on the catalytic mechanism

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Green Energy & Environment 2023年第2期8卷 538-547页

作者： Xunxun li Yaru Wang Dongyun Chen najun li Qingfeng Xu Hua li Jinghui He Jianmei Lu College of Chemistry Chemical Engineering and Materials ScienceCollaborative Innovation Center of Suzhou Nano Science and TechnologySoochow UniversitySuzhouJiangsu215123China

Manganese oxide(MnO_(2))exhibits excellent activity for volatile organic compound oxidation.However,it is currently unknown whether lattice oxygen or adsorbed oxygen is more conducive to the progress of the catalytic reaction.In this study,novel hollow highly dispersed Pt/Copper modified-MnO_(2)catalysts were fabricated.Cu^(2+)was stabilized into theδ-MnO_(2)cladding substituting original K+,which produced lattice defects and enhance the content of adsorbed oxygen.The 2.03 wt%Pt Cu_(0.050)-MnO_(2)catalyst exhibited the highest catalytic activity and excellent stability for toluene and benzene oxidation,with T_(100)=160℃under high space velocity(36,000 mL g^(-1)h^(-1)).The excellent performance of catalytic oxidation of VOCs is attributed to the abundant adsorbed oxygen content,excellent low-temperature reducibility and the synergistic catalytic effect between the Pt nanoparticles and Cu_(0.050)-MnO_(2).This study provides a comprehensive understanding of the Langmuir-Hinshelwood(L-H)mechanism occurring on the catalysts.

关键词： Oxygen species Toluene Benzene d-MnO_(2) Hollow

沙棘籽油纳米乳的制备、质量评价及其抗氧化活性研究

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中国食品添加剂 2024年第4期35卷 124-130页

作者：陈超张娜郡宋露露李云飞秦楠山西中医药大学中药与食品工程学院晋中030619

研究沙棘籽油纳米乳的制备方法,并对其进行质量评价和抗氧化活性研究。采用伪三元相图法筛选出沙棘籽油纳米乳配方,通过测定其理化性质、抗氧化活性等对制备的沙棘籽油纳米乳进行评价。结果显示:得到沙棘籽油纳米乳最佳配方为肉豆蔻酸... 详细信息

研究沙棘籽油纳米乳的制备方法,并对其进行质量评价和抗氧化活性研究。采用伪三元相图法筛选出沙棘籽油纳米乳配方,通过测定其理化性质、抗氧化活性等对制备的沙棘籽油纳米乳进行评价。结果显示:得到沙棘籽油纳米乳最佳配方为肉豆蔻酸异丙酯∶Tween-80∶无水乙醇∶沙棘籽油∶水=3.18%∶9.55%∶3.18%∶6.37%∶77.72%。平均粒径为(17.14±0.23)nm,平均多分散系数为0.457±0.023,平均Ze Ta电位为(-8.76±0.76)mV,平均折光率为1.402±0.123,平均p H为5.04±0.21。在常温储存、离心、稀释、冻存后均具有较好的稳定性。且对超氧阴离子自由基、DPPH自由基和羟自由基均有清除作用。以上研究表明沙棘籽油纳米乳具有较好的稳定性和抗氧化活性,有助于为开发沙棘籽油功能产品提供新的研究思路。

关键词：沙棘籽油纳米乳伪三元相图稳定性质量评价抗氧化活性

2D/2D hierarchical Co_(3)O_(4)/ZnIn_(2)S_(4)heterojunction with robust builtin electric field for efficient photocatalytic hydrogen evolution

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Nano Research 2023年第5期16卷 6134-6141页

作者： Guping Zhang Xunxun li Mengmeng Wang Xueqing li Yaru Wang Shuting Huang Dongyun Chen najun li Qingfeng Xu Hua li Jianmei Lu College of Chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China

Because of its importance in enhancing charge separation and transfer,built-in electric field engineering has been acknowledged as an effective technique for improving photocatalytic performance.Herein,a stable p–n heterojunction of 2D/2D(2D:twodimensional)Co_(3)O_(4)/ZnIn_(2)S_(4)with a strong built-in electric field is precisely constructed.The Co_(3)O_(4)/ZnIn_(2)S_(4)heterojunction exhibits a higher visible-light photocatalytic hydrogen(H2)evolution rate than the individual components,which is primarily attributed to the synergy effect of improved light absorption,abundant active sites,short charge transport distance,high separation efficiency of photogenerated carriers.Furthermore,the photoelectrochemical studies and density functional theory(DFT)calculation results demonstrate that the enhanced interfacial charge separation and migration induced by the generated built-in electric field are the critical reasons for the boosted photocatalytic performance.This research might pave the way for the rational design and manufacturing of 2D/2D heterojunction photocatalysts with extremely efficient photocatalytic performance for solar energy conversion.

关键词： 2D/2D heterojunction photocatalysis built-in electric field interfacial charge transfer H_(2)evolution

制备粉葛中葛根素纳米脂质体的工艺优化及其表征

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中国食品添加剂 2024年第4期35卷 31-39页

作者：张娜郡陈超宋露露李云飞秦楠山西中医药大学中药与食品工程学院晋中030619

采用熔融超声乳化-低温固化法制备粉葛中葛根素纳米脂质体(Puerarin nano-liposomes carriers,Pue-NLC),通过单因素和正交实验优化制备工艺,对其相关表征和体外释放特性进行评价。得到最优工艺为Pue用量5 mg,药脂比1∶17,单硬脂酸甘油酯... 详细信息

采用熔融超声乳化-低温固化法制备粉葛中葛根素纳米脂质体(Puerarin nano-liposomes carriers,Pue-NLC),通过单因素和正交实验优化制备工艺,对其相关表征和体外释放特性进行评价。得到最优工艺为Pue用量5 mg,药脂比1∶17,单硬脂酸甘油酯:辛癸酸甘油酯用量比3∶1,乳化剂用量3%,卵磷脂:聚醚F188用量比1∶1,超声温度70℃。测得其粒径为(203.7±2.76)nm,PDI (0.193±0.34),Zeta电位(-22.37±3.46) mV,包封率(78.3±1.59)%,载药量(1.36±0.06)%,电镜扫描可见Pue-NLC的类球状小囊泡结构,其粒径小,载药量、包封率高,具有一定的缓释作用,为葛根素的有效利用和新型给药系统研究提供了新的方法和思路。

关键词：葛根素纳米脂质体单因素包封率体外释放

Negative effect on molecular planarity to achieve organic ternary memory: triphenylamine as the spacer

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中国科学：化学英文版 2016年第6期59卷 692-698页

作者： Shugang Xia Jinghui He Hua li Qingfeng Xu najun li Dongyun Chen Jianmei Lu College of Chemistry Chemical Engineering and Materials ScienceCollaborative Innovation Center of Suzhou Nano Science and TechnologySoochow University

Adjusting the spacers between the electron-acceptor and the elector-donor is important to design organic ternary memory material but rarely reported. In this paper, two small molecules, ZIPGA and ZIPCAD with benzene ring or triphenylamine as the spacers,were designed and synthesized to fabricate memory devices. The Al/ZIPGA/indium-tin oxide (ITO) device showed ternary characteristics, whereas Al/ZIPCAD/ITO had no obvious memory characteristics. Density functional theory calculation, X-ray diffraction (XRD) and atomic force microscopy (AFM) were employed to interpret the different memory properties. ZIPGA thin film has the closer intermolecular packing and flatter surface morphology than ZIPCAD film, which was favorable to the electron migration. This work demonstrates the importance of spacers and reveals that triphenylamine may be not a good spacer in design of new memory material.

关键词：记忆材料三苯胺小分子三元平面性原子力显微镜密度泛函理论 X-射线衍射