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Biomimetic leaf structures for ultra-thin electromagnetic wave absorption

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Nano Research 2024年第5期17卷 4507-4516页

作者： Shikun Hou Ying Wang Feng Gao Fei Jin Benfeng Zhu Qiong Wu hongliang Ge Zhihai cao Hua Yang Magnetism Key Laboratory of Zhejiang Province&College of Optical and Electronic Technology China Jiliang UniversityHangzhou 310018China Department of Materials Science and Engineering Guangdong Technion-Israel Institute of TechnologyShantou 515063China Key Laboratory of Advanced Textile Materials and Manufacturing Technology and Engineering Research Center for Eco-Dyeing&Finishing of Textiles Ministry of EducationZhejiang Sci-Tech UniversityHangzhou 310018China

Ultra-thin electromagnetic wave(EMW)absorbers present challenging demands on EMW absorption performance.Drawing inspiration from heather leaf structures,this study introduces an innovative design strategy for EMW absorbing material,proposing biomimetic leaf SnO_(2) structures(bio-SnO_(2))on carbon fabric(CF).By employing leaf-shaped SnS2 as precursors,biomimetic leaf SnO_(2) nanostructures are constructed on CF surface after a simple thermal treatment,resulting in bio-SnO_(2)@CF composite.Experimental results indicate that bio-SnO_(2)@CF exhibits an exceptional minimum reflection loss of-54.8 dB at an incredibly thin thickness of 1.2 mm.Radar cross section(RCS)simulations further validate the outstanding EMW attenuation ability of bio-SnO_(2)@CF,attaining a maximum RCS reduction value of 16.9 dBm^(2) at an incident wave angle ofθ=0°.This novel research showcases the biomimetic structural design strategy and its remarkable function in enhancing the EMW absorbing performance at ultra-thin absorber thickness.

关键词： biomimetic leaf structures electromagnetic wave absorption ultra-thin thickness

Prognostic value of calcium and phosphorus status in elderly heart disease patients with tricuspid regurgitation

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Chinese Medical Journal 2024年第5期137卷 613-615页

作者： Qingrong Liu Kai cao Ziang Li Yunqing Ye Qian Zhang hongliang Zhang Haiyan Xu Zhe Li Yongjian Wu CHINA-DVD Collaborators Department of Cardiology Beijing Aerospace General HospitalBeijing 100076China Department of Cardiology Fuwai HospitalNational Center for Cardiovascular DiseaseChinese Academy of Medical Science and Peking Union Medical CollegeBeijing 100037China Department of Beijing Institute of Ophthalmology Beijing Tongren HospitalCapital Medical UniversityBeijing 100000China 不详

To the Editor:Tricuspid regurgitation(TR)associated with valve disease is a general medical issue with growing prevalence and socioeconomic burden.TR,especially moderate or severe TR,has been reported to be associated with an increased risk of heart failure and mortality.^([1])Studies have shown that blood calcium levels and blood phosphorus levels have a great influence on the human body,especially on the cardiovascular system.Elevated serum calcium levels were reported to be a risk factor for cardiovascular disease.^([2])A meta-analysis reported that moderate dietary calcium intake protects against cardiovascular and all-cause mortality and that calcium supplementation reduces mortality in women.^([3])

关键词： mortality regurgitation cardiovascular

Petrogenesis of granitic pegmatite veins:Perspectives from major element and B isotope in tourmalines,Chakabeishan,Northern Tibetan Plateau

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Geoscience Frontiers 2023年第5期14卷 267-279页

作者： Wenli Sun Zhidan Zhao Yaoling Niu Chunjing Wei Guochen Dong Xiaowei Li Wanming Yuan Tao Wang Bingzhang Wang Tong Pan Jie Han hongliang cao Yan Tang Dicheng Zhu State Key Laboratory of Geological Processes and Mineral Resources and School of Earth Science and ResourcesChina University of GeosciencesBeijing 100083China MOE Key Laboratory of Orogenic Belts and Crustal Evolution School of Earth and Space SciencesPeking UniversityBeijing 100871China Gansu Industry Polytechnic College Tianshui 741025China Laoshan Laboratory Qingdao 266237China Bureau of Geological Exploration and Development of Qinghai Province Xining 810012China

The petrogenesis of regionally zoned granitic pegmatite veins remains debated.Because of the economic significance,we carried out a study on the Chakabeishan(CKBS)pegmatite-type Li-Be deposit,eastern North Qaidam Tectonic Belt,Northern Tibetan Plateau,by means of in-situ major element and B isotope compositions of tourmalines in the beryl-bearing and spodumene-bearing pegmatite veins.Tourmalines(Tur-Be)from the beryl-bearing pegmatite are homogeneous schorl with low Mg/(Mg+Fe),high Na/(Na+Ca)and Y Al,suggesting that they are of magmatic origin.Two generations of tourmalines(TurLi)from the spodumene-bearing pegmatite are identified:(i)the crystal cores(mostly elbaite and Lirich schorl with subordinate schorl)are consistent with being of magmatic origin crystallized at the magmatic stage;(ii)the crystal rims(schorl)are best understood as the overgrowth at the later hydrothermal stage.Tur-Be and Tur-Li show an obvious difference in core-to-rim B isotopic variation trend with d11B decrease in Tur-Be and increase in Tur-Li.The core-to-rim d11B decrease in Tur-Be results from degassing during its host pegmatitic melt evolution,whereas the core-to-rim d11B increase in Tur-Li is related to fluid exsolution.The estimated d11B values for the initial melts of the beryl-bearing and spodumenebearing pegmatites are10.46‰and10.78‰,respectively,indicating that they most likely originate from protracted fractional crystallization/differentiation of granitic intrusions rather than partial melting of metapelite.Both Mg/(Mg+Fe)ratios and Li abundances in the cores of Tur-Be are lower than those of Tur-Li,suggesting that Tur-Li crystallizes from chemically more evolved melts.

关键词： Petrogenesis Pegmatite Tourmaline Boron isotope Major element

Effects Associated with Nanostructure Fabrication Using In Situ Liquid Cell TEM Technology

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Nano-Micro Letters 2015年第4期7卷 385-391页

作者： Xin Chen Lihui Zhou Ping Wang hongliang cao Xiaoli Miao Feifei Wei Xia Chen Shanghai Key Laboratory of Advanced Polymeric Materials and Key Laboratory for Ultrafine Materials of Ministry of Education School of Materials Science and EngineeringEast China University of Science and Technology State Key Laboratory of Functional Materials for Informatic Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences East China University of Science and Technology State Key Laboratory of Bioreactor Engineering Biomedical Nanotechnology Center East China University of Science and Technology

We studied silicon,carbon,and SiC xnanostructures fabricated using liquid-phase electron-beam-induced deposition technology in transmission electron microscopy systems.Nanodots obtained from fixed electron beam irradiation followed a universal size versus beam dose trend,with precursor concentrations from pure Si Cl4to 0%SiC l4in CH2Cl2,and electron beam intensity ranges of two orders of magnitude,showing good controllability of the deposition.Secondary electrons contributed to the determination of the lateral sizes of the nanostructures,while the primary beam appeared to have an effect in reducing the vertical growth rate.These results can be used to generate donut-shaped nanostructures.Using a scanning electron beam,line structures with both branched and unbranched morphologies were also obtained.The liquid-phase electron-beaminduced deposition technology is shown to be an effective tool for advanced nanostructured material generation.

关键词： Electron-beam-induced deposition In situ TEM Nanostrucutre Semiconductor Nanolithography

An acid-triggered porphyrin-based block copolymer for enhanced photodynamic antibacterial efficacy

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Science China Chemistry 2021年第3期64卷 459-466页

作者： Fan Yu Chao Chen Guoliang Yang Zhengtong Ren hongliang cao Liangshun Zhang Weian Zhang Shanghai Key Laboratory of Functional Materials Chemistry East China University of Science and TechnologyShanghai 200237China

Bacterial infection, especially multidrug-resistant(MDR) bacterial infection has threatened public health drastically. Here, we fabricate an "acid-triggered" nanoplatform for enhanced photodynamic antibacterial activity by reducing the aggregation of photosensitizers(PSs) in bacterial acidic microenvironment. Specifically, a functional amphiphilic block copolymer was first synthesized by using a pH-sensitive monomer, 2-(diisopropylamino) ethyl methacrylate(DPA) and porphyrin-based methacrylate(TPPC6MA) with poly(oligo(ethylene glycol) methyl ether methacrylate)(POEGMA) as the macromolecular chain transfer agent, and POEGMA-b-[PDPA-co-PTPPC6MA] block copolymer was further self-assembled into spherical nanoparticles(PDPA-TPP). PDPA-TPP nanoparticles possess an effective electrostatic adherence to negatively charged bacterial cell membrane, since they could rapidly achieve positive charge in acidic bacterial media. Meanwhile, the acid-triggered dissociation of PDPA-TPP nanoparticles could reduce the aggregation caused quenching(ACQ) of the photosensitizers, leading to around 5 folds increase of the singlet oxygen(1O2) quantum yield. In vitro results demonstrated that the "acid-triggered" PDPA-TPP nanoparticles could kill most of MDR S. aureus(Gram-positive) and MDR E. coli(Gram-negative) by enhanced photodynamic therapy, and they could resist wound infection and accelerate wound healing effectively in vivo. Furthermore, PDPA-TPP nanoparticles could well disperse the biofilm and almost kill all the biofilm-containing bacteria. Thus, by making use of the bacterial acidic microenvironment, this "acid-triggered" nanoplatform in situ will open a new path to solve the aggregation of photosensitizers for combating broad-spectrum drug-resistant bacterial infection.

关键词： photodynamic therapy antibacterial porphyrin aggregation caused quenching(ACQ)

Direct Observation of Growth and Self-assembly of Pt Nanoclusters in Water with the Aid of a Triblock Polymer Using in situ Liquid Cell Transmission Electron Microscopy （TEM）

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Chinese Journal of Chemistry 2017年第8期35卷 1278-1283页

作者： Xin Chen Chang Li Xing Kong hongliang cao Hulian Wang Xiaoqin Zhou Key Laboratory for Ultrafine Materials of Ministry of Education and Shanghai Key Laboratory of Advanced Polymeric Materials School of Materials Science and Engineering East China University of Science and Technology Shanghai 200237 China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and InformationTechnology Chinese Academy of Sciences Shanghai 200050China State Key Laboratory of Bioreactor Engineering Biomedical Nanotechnology Center East China University of Science and Technology Shanghai 200237 China

Triblock copolymers are playing important roles in nanomaterial synthesis, and the nanomaterial forming mechanisms need to be studied in detail. In situ liquid cell transmission electron microscopy （TEM） is a powerful tool for real time observation of the dynamic growth behavior of nanomaterials in liquid with high resolution, and could be used for the above task. Here we report the observation of the growth and self-assembly of Pt nanoclusters with the aid of an ethylene oxide-propylene oxide-ethylene oxide triblock copolymer （PEO-PPO-PEO） F 127 using in situ liquid cell TEM, with the nanocluster growth and formation procedures being tracked. Nano objects were seen to appear, drift and rotate with time, and then form into certain shaped nanoclusters under the electron beam irradiation. Further interestingly, in the thicker liquid layer region, the nanoclusters appeared to be fluffy, with average size keeping increase with time, while in the thinner region, the clusters were thinner, and got densified with time. The difference in precursor availability due to liquid layer thickness and charging effects is attributed to such a phenomenon.

关键词： in sire liquid cell TEM electron beam induced growth self-assembly Pt triblock copolymer

A Study of Electron Beam Induced Deposition and Nano Device Fabrication Using Liquid Cell TEM Technology

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Chinese Journal of Chemistry 2014年第5期32卷 399-404页

作者： Xin Chen Lihui Zhou Ping Wang hongliang cao Xiaoli Miao Feifei Wei Key Laboratory for Ultrafine Materials of Ministry of Education and Shanghai Key Laboratory of Advanced Polymeric MaterialsSchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China Department of Materials Science and Engineering University of Illinois at Urbana-ChampaignUrbanaIL 61801USA State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China East China University of Science and Technology Shanghai 200237China State Key Laboratory of Bioreactor Engineering Biomedical Nanotechnology CenterEast China University of Science and TechnologyShanghai 200237China

SiCx nano dots and nano wires with sizes from 60 nm to approximately 2μm were fabricated using liquid cell transmission electron microscope(TEM)technology.A SiCl_(4)in CH_(2)Cl_(2)solution was sealed between two pieces of Si_(3)N_(4)window grids in an in situ TEM liquid cell.Focused 200 keV electron beams were used to bombard the sealed precursors,which caused decomposition of the precursor materials,and deposition of the nano materials on the Si_(3)N_(4)window substrates.The size of nano dots increased with beam exposure time,following an approximately exponential relationship with the beam doses.Secondary electrons are attributed as the primary sources for the Si and C reduction.A nano device was formed from a deposited nano wire,with its electrical property characterized.

关键词： electron beam induced deposition in situ TEM nanolithography nanodevices

A Novel Strategy of Multi-element Nanocomposite Synthesis for High Performance ZnO-CoSe_(2) Supercapacitor Material Development

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Chinese Journal of Chemistry 2021年第9期39卷 2441-2450页

作者： Xin Chen Yan Li Chang Li hongliang cao Chuanzhen Wang Siyu Cheng Qi Zhang Key Laboratory for Ultrafine Materials of Ministry of Education and Shanghai Key Laboratory of Advanced Polymeric MaterialsSchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China Analytical and Testing Center Anhui University of Science&TechnologyHuainanAnhui 232001China State Key Laboratory of Bioreactor Engineering Biomedical Nanotechnology CentreEast China University of Science and TechnologyShanghai 200237China

Developing multi-eleme nt composites is a promisi ng way for high perform a nee supercapacitor material developme nt,and simplifying the synthesis steps is critical for reducing the preparation costs and successful promotion of the materials.A novel one-step selective reaction strategy is developed,and successfully used to prepare four-element ZnO-CoSe_(2)(ZOCS)nano-spherical composites,to be used as supercapacitor materials.Started form nano-spherical glycerate templates,under the optimal synthesis condition,the obtained ZOCS-0.125 electrode material exhibits a specific capacitance of 450.7 F/g at 1 A/g and a good rate performance by keeping 76.8%capacitance at 20 A/g.Moreover,the ZOCS-0.125 electrode exhibits excellent cycle stability of 114.9%capacitance retention after 5000 cycles at 10 A/g.An asymmetric supercapacitor assembled by ZOCS-0.125 and activated carbon electrodes delivers an energy density of 22.35 Wh/kg at 825 W/kg,and a cycle stability of 105.6%capacitance retention after 5000 cycles.This work not only shows the good potential of the facilely prepared ZnO-CoSe_(2) composite electrode material,but also dem on strates a new strategy for low cost and high performance multielement composite material development,that can be used in a wide range of applications.

关键词： Selective combination Supercapacitor Electrochemistry Nan oparticles Energy conversion

经椎间孔入路全内镜下椎体间融合术治疗胸腰段硬性椎间盘突出症的技术要点及临床疗效

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中国脊柱脊髓杂志 2024年第4期34卷 362-371页

作者：李振宙曹峥赵宏亮朱加亮侯树勋解放军总医院第四医学中心骨科医学部北京市100048

目的:探讨经椎间孔入路全内镜下椎体间融合术治疗胸腰段硬性椎间盘突出症的技术要点及临床疗效。方法:纳入2018年1月~2021年9月期间我科采用经椎间孔入路全内镜下椎体间融合术治疗的14例(20个节段)胸腰段硬性椎间盘突出症患者,其中男11... 详细信息

目的:探讨经椎间孔入路全内镜下椎体间融合术治疗胸腰段硬性椎间盘突出症的技术要点及临床疗效。方法:纳入2018年1月~2021年9月期间我科采用经椎间孔入路全内镜下椎体间融合术治疗的14例(20个节段)胸腰段硬性椎间盘突出症患者,其中男11例,女3例,平均年龄43.3±12.6岁;2例三节段病变,2例双节段病变,10例单节段病变。硬性致压物分类包括:钙化性椎间盘突出3例、骨赘性椎间盘突出6例、不典型休门氏病合并椎间盘突出3例,椎体后缘离断症2例。术前所有患者均表现脊髓或马尾神经症状,其中6例合并神经根性症状。手术先采用局部麻醉下经椎间孔入路全内镜下椎体间融合、突出椎间盘切除减压,继而行全麻下经皮椎弓根螺钉系统置入术。观察术后第2天、3个月、6个月及1年的影像学变化,术后1周、3个月、6个月及术后1年时疼痛症状及功能恢复状况。背痛及神经根性疼痛采用视觉模拟评分(visual analogue scale,VAS)评估,神经学功能评估采用Nurick评分及改良日本骨科学会(mJOA)评分,胸椎功能评价采用Oswestry功能障碍指数(Oswestry disability index,ODI)。结果:所有手术均顺利完成,无术中更换手术方式发生。所有患者术后胸腰段MRI及CT检查均显示脊髓或马尾神经减压充分,无致压物残留;术后1年随访时,所有手术节段均获得骨性融合。所有患者术后背痛、神经根性疼痛均明显缓解,脊髓功能明显恢复。术后Nurick评分、mJOA评分及ODI较术前均有显著改善(P<0.01),且术后1年较术后1周、3个月及6个月均有显著性改善(P<0.01)。mJOA平均恢复率72.5%,优7例、良5例、可2例。有2例术中出现硬脊膜撕裂,未予特殊处理,但随访未见脑脊液漏及假性脊膜膨出发生;无其他手术并发症发生。结论:局部麻醉下经椎间孔入路全内镜下椎体间融合、突出椎间盘切除结合全麻下经皮椎弓根螺钉系统固定术是治疗位于胸腰段脊髓或马尾神经腹侧的硬性椎间盘突出症的安全、有效的微创脊柱外科技术。

关键词：椎间盘突出症全内镜下椎体间融合术椎间盘切除术经椎间孔入路