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Stretchable,Transparent,and Ultra-Broadband Terahertz Shielding Thin Films Based on Wrinkled MXene Architectures

Nano-Micro Letters 2024年第9期16卷 110-122页

作者： Shaodian Yang Zhiqiang Lin Ximiao Wang Junhua Huang Rongliang Yang Zibo chen Yi Jia Zhiping Zeng Zhaolong Cao Hongjia Zhu Yougen Hu Enen Li Huanjun chen tianwu Wang Shaozhi Deng Xuchun Gui State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySun Yat-Sen UniversityGuangzhou 510275People’s Republic of China National Key Laboratory of Materials for Integrated Circuits Shenzhen Institute of Advanced Electronic MaterialsShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055People’s Republic of China Guangdong Province Key Laboratory of Display Material and Technology Guangzhou 510275People’s Republic of China China Academy of Aerospace Science and Innovation Beijing 100176People’s Republic of China School of Materials Science and Engineering Sun Yat-Sen UniversityGuangzhou 510275People’s Republic of China GBA Branch of Aerospace Information Research Institute Chinese Academy of SciencesGuangzhou 510700People’s Republic of China School of Electronic Electrical and Communication EngineeringUniversity of Chinese Academy of SciencesBeijing 100049People’s Republic of China Guangdong Provincial Key Laboratory of Terahertz Quantum Electromagnetics Guangzhou 510700People’s Republic of China

With the increasing demand for terahertz(THz)technology in security inspection,medical imaging,and flexible electronics,there is a significant need for stretchable and transparent THz electromagnetic interference(EMI)shielding materials.Existing EMI shielding materials,like opaque metals and carbon-based films,face challenges in achieving both high transparency and high shielding efficiency(SE).Here,a wrinkled structure strategy was proposed to construct ultra-thin,stretchable,and transparent terahertz shielding MXene films,which possesses both isotropous wrinkles(height about 50 nm)and periodic wrinkles(height about 500 nm).Compared to flat film,the wrinkled MXene film(8 nm)demonstrates a remarkable 36.5%increase in SE within the THz band.The wrinkled MXene film exhibits an EMI SE of 21.1 dB at the thickness of 100 nm,and an average EMI SE/t of 700 dBμm^(−1)over the 0.1-10 THz.Theoretical calculations suggest that the wrinkled structure enhances the film’s conductivity and surface plasmon resonances,resulting in an improved THz wave absorption.Additionally,the wrinkled structure enhances the MXene films’stretchability and stability.After bending and stretching(at 30%strain)cycles,the average THz transmittance of the wrinkled film is only 0.5%and 2.4%,respectively.The outstanding performances of the wrinkled MXene film make it a promising THz electromagnetic shielding materials for future smart windows and wearable electronics.

关键词： Terahertz Wrinkle structure Electromagnetic interference shielding MXene

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Stratified-structural hydrogel incorporated with magnesium-ion-modified black phosphorus nanosheets for promoting neuro-vascularized bone regeneration

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Bioactive Materials 2022年第10期7卷 271-284页

作者： Yan Xu Chao Xu Lei He Junjie Zhou tianwu chen Liu Ouyang Xiaodong Guo Yanzhen Qu Zhiqiang Luo Deyu Duan Department of Orthopaedics Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan430074China College of Life Science and Technology Huazhong University of Science and TechnologyChina Wuhan430022China Department of Pathology Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan430022China Fudan University Sports Medicine Institute Shanghai200040China

Angiogenesis and neurogenesis play irreplaceable roles in bone repair.Although biomaterial implantation that mimics native skeletal tissue is extensively studied,the nerve-vascular network reconstruction is neglected in the design of biomaterials.Our goal here is to establish a periosteum-simulating bilayer hydrogel and explore the efficiency of bone repair via enhancement of angiogenesis and neurogenesis.In this contribution,we designed a bilayer hydrogel platform incorporated with magnesium-ion-modified black phosphorus(BP)nanosheets for promoting neuro-vascularized bone regeneration.Specifically,we incorporated magnesium-ion-modified black phosphorus(BP@Mg)nanosheets into gelatin methacryloyl(GelMA)hydrogel to prepare the upper hydrogel,whereas the bottom hydrogel was designed as a double-network hydrogel system,consisting of two interpenetrating polymer networks composed of GelMA,PEGDA,andβ-TCP nanocrystals.The magnesium ion modification process was developed to enhance BP nanosheet stability and provide a sustained release platform for bioactive ions.Our results demonstrated that the upper layer of hydrogel provided a bionic periosteal structure,which significantly facilitated angiogenesis via induction of endothelial cell migration and presented multiple advantages for the upregulation of nerve-related protein expression in neural stem cells(NSCs).Moreover,the bottom layer of the hydrogel significantly promoted bone marrow mesenchymal stem cells(BMSCs)activity and osteogenic differentiation.We next employed the bilayer hydrogel structure to correct rat skull defects.Based on our radiological and histological examinations,the bilayer hydrogel scaffolds markedly enhanced early vascularization and neurogenesis,which prompted eventual bone regeneration and remodeling.Our current strategy paves way for designing nerve-vascular network biomaterials for bone regeneration.

关键词： Angiogenesis Neurogenesis Bone regeneration Hydrogel Black phosphorus

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In situ Observation of Li Deposition-Induced Cracking in Garnet Solid Electrolytes

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Energy & Environmental Materials 2022年第2期5卷 524-532页

作者： Jun Zhao Yongfu Tang Qiushi Dai Congcong Du Yin Zhang Dingchuan Xue tianwu chen Jingzhao chen Bo Wang Jingming Yao Ning Zhao Yanshuai Li Shuman Xia Xiangxin Guo Stephen J.Harris Liqiang Zhang Sulin Zhang Ting Zhu Jianyu Huang Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China Woodruff School of Mechanical Engineering Georgia Institute of TechnologyAtlanta Georgia 30332USA Department of Engineering Science and Mechanics The Pennsylvania State UniversityUniversity Park PA 16802USA Energy Storage Division Lawrence BerkeleyNational LaboratoryBerkeley CA 94720USA College of Physics Qingdao UniversityQingdao 266071China Hebei Key Laboratory of Applied Chemistry School of Environmental and Chemical EngineeringYanshan UniversityQinhuangdao 066004China School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105China

Lithium(Li)penetration through solid electrolytes(SEs)induces short circuits in Li solid-state batteries(SSBs),which is a critical issue that hinders the development of high energy density SSBs.While cracking in ceramic SEs has been often shown to accompany Li penetration,the interplay between Li deposition and cracking remains elusive.Here,we constructed a mesoscale SSB inside a focused ion beam-scanning electron microscope(FIB-SEM)for in situ observation of Li deposition-induced cracking in SEs at nanometer resolution.Our results revealed that Li propagated predominantly along transgranular cracks in a garnet Li_(6.4)La_(3)Zr_(1.4)Ta_(0.6)O_(12)(LLZTO).Cracks appeared to initiate from the interior of LLZTO beneath the electrode surface and then propagated by curving toward the LLZTO surface.The resulting bowl-shaped cracks resemble those from hydraulic fracture caused by high fluid pressure on the surface of internal cracks,suggesting that the Li deposition-induced pressure is the major driving force of crack initiation and propagation.The high pressure generated by Li deposition is further supported by in situ observation of the flow of filled Li between the crack flanks,causing crack widening and propagation.This work unveils the dynamic interplay between Li deposition and cracking in SEs and provides insight into the mitigation of Li dendrite penetration in SSBs.

关键词： cracking garnet solid electrolyte in situ observation Li deposition

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Gadolinium-hyaluronic acid nanoparticles as an efficient and safe magnetic resonance imaging contrast agent for articular cartilage injury detection

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Bioactive Materials 2020年第4期5卷 758-767页

作者： Rong Lu Yuyang Zhang Hongyue Tao Lu Zhou Huidi Li tianwu chen Peng Zhang Yao Lu Shuang chen Department of Radiology Huashan HospitalFudan UniversityShanghai200040China Department of Medicinal Chemistry School of PharmacyFudan UniversityShanghai201203China Department of Sports Medicine Huashan HospitalFudan UniversityShanghai200040China Guangdong Key Lab of Orthopedic Technology and Implant Materials Key Laboratory of Trauma&Tissue Repair of Tropical Area of PLAGuangzhouGuangdong510010China Orthopedic Centre Clinical Research CentreZhujiang HospitalSouthern Medical UniversityGuangzhouGuangdong510280China

Accurate detection of cartilage injuries is critical for their proper treatment because these injuries lack the selfhealing ability and lead to joint dysfunction.However,the low longitudinal T1 relaxivity(r1)and non-specificity of contrast agents(such as gadolinium(III)-diethylenetriamine-pentaacetic acid(Gd-DTPA))significantly limit the efficiency of clinical magnetic resonance imaging(MRI)applications.To overcome these drawbacks,we integrated hyaluronic acid(HA)with Gd to synthesize a Gd-DTPA-HA composite,which was subsequently freeze-dried to produce nanoparticles(NPs).The resultant Gd-HA NPs demonstrated a greater r1 value(12.51 mM^-1 s^-1)compared with the bulk Gd-DTPA-HA(8.37 mM^-1 s^-1)and clinically used Gd-DTPA(3.88 mM^-1 s^-1).Moreover,the high affinity of HA to the cartilage allowed these NPs to penetrate deeper beyond the cartilage surface.As a result,Gd-HA NPs considerably increased the quality of cartilage and lesion MR images via their intra-articular injection in vivo.Specifically,2 h after NP administration,the signal-to-noise ratio at the injured cartilage site was 2.3 times greater than the value measured before the injection.In addition,Gd-HA NPs exhibited good biosafety properties due to the absence of adverse effects in the blood or on the main organs.It was also showed that Gd NPs were first metabolized by the kidney and liver and then excreted from the body with urine.Thus,Gd-HA NPs can potentially serve as an efficient MRI contrast agent for improved detection of cartilage injuries.

关键词： Hyaluronic acid Gadolinium Nanoparticles Magnetic resonance imaging contrast agents Cartilage injury

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基于瘤周肝组织DWI列线图模型预测肝切除术后复发性肝细胞癌局部进展研究

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磁共振成像 2024年第2期15卷 63-70页

作者：王晶曾朝强汤梦月许敏张小明陈天武川北医学院附属医院放射科医学影像四川省重点实验室南充637000 川北医学院第二临床医学院·南充市中心医院影像科南充637000 重庆医科大学附属第二医院放射科重庆400010

目的探讨构建基于肝切除术后复发性肝细胞癌(recurrent hepatocellular carcinoma,rHCC)瘤周区域表观扩散系数(apparent diffusion coefficient,ADC)列线图模型预测局部进展的可行性。材料与方法采用回顾性队列研究方法,收集川北医学院... 详细信息

目的探讨构建基于肝切除术后复发性肝细胞癌(recurrent hepatocellular carcinoma,rHCC)瘤周区域表观扩散系数(apparent diffusion coefficient,ADC)列线图模型预测局部进展的可行性。材料与方法采用回顾性队列研究方法,收集川北医学院附属医院2021年1月至2022年12月诊断为肝切除术后rHCC患者的MRI资料及临床特征。基于Firevoxel软件测量rHCC瘤周肝组织ADC平均值(peritumor ADCmean,pADCmean)、最小值(peritumor ADCmin,pADCmin)、最大值(peritumor ADCmax,pADCmax)和肿瘤ADC平均值(tumor ADCmean,tADCmean)、最小值(tumor ADCmin,tADCmin)、最大值(tumor ADCmax,tADCmax),以及背景肝组织ADC平均值(background liver tissue ADCmean,bADCmean)、最小值(background liver tissue ADCmin,bADCmin)、最大值(background liver tissue ADCmax,bADCmax)。计算瘤周与背景肝组织ADCmean比值(ratio of pADCmeanto bADCmean,RPB-ADCmean)、ADCmin比值(ratio of pADCminto bADCmin,RPB-ADCmin)、ADCmax比值(ratio of pADCmaxto bADCmax,RPB-ADCmax),以及肿瘤与背景肝组织ADCmean比值(ratio of tADCmeanto bADCmean,RTB-ADCmean)、ADCmin比值(ratio of tADCminto bADCmin,RTB-ADCmin)、ADCmax比值(ratio of tADCmaxto bADCmax,RTB-ADCmax)。采用Cox回归分析筛选独立危险因素,并构建列线图预测模型,绘制受试者工作特征(receiver operating characteristic,ROC)曲线和决策曲线分析(decision curve analysis,DCA),评价模型预测rHCC局部进展的价值。结果本研究共纳入70例肝切除术后rHCC患者,随访证实肿瘤局部进展率为65.7%(46/70)。多因素Cox回归分析显示,pADCmin、RPB-ADCmean和异常凝血酶原是肝切除术后rHCC局部进展的独立危险因素(P均<0.05)。列线图模型预测肝切除术后rHCC在3个月内、6个月内局部进展的ROC曲线下面积分别为0.834、0.841,DCA显示模型有较好临床净收益。结论pADCmin、RPB-ADCmean和异常凝血酶原是预测肝切除术后rHCC局部进展的独立危险因素,构建的列线图模型可直观地预测rHCC局部进展,且具有较好的效能和临床价值。

关键词：肝细胞癌复发瘤周肝组织磁共振成像扩散加权成像列线图

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喷丸强化对预变形CP800复相钢疲劳性能的影响

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上海大学学报（自然科学版） 2024年第2期30卷 278-288页

作者：崔浩诚王荃陈卓周俊戚天武汪宏斌上海大学材料科学与工程学院上海200444

喷丸强化可以提高CP800复相钢的抗疲劳性能.采用低(0.15 mmA)、中(0.3 mmA)、高(0.5 mmA)3种喷丸强度对5%预拉伸变形后的CP800复相钢进行表面喷丸处理,研究了喷丸后材料的表面形貌和表面残余应力,并通过拉压疲劳试验分析了疲劳断口.研... 详细信息

喷丸强化可以提高CP800复相钢的抗疲劳性能.采用低(0.15 mmA)、中(0.3 mmA)、高(0.5 mmA)3种喷丸强度对5%预拉伸变形后的CP800复相钢进行表面喷丸处理,研究了喷丸后材料的表面形貌和表面残余应力,并通过拉压疲劳试验分析了疲劳断口.研究发现:2 mm板厚的CP800复相钢更适合采用低喷丸强度,疲劳寿命约为未喷丸试样的3倍;疲劳寿命的提升归因于表层发生塑性变形、位错密度提高,且残余压应力可抑制裂纹萌生;喷丸后材料表面粗糙度增大;喷丸强度过高易造成表面缺陷增多,尤其在高喷丸强度下,试样表面会出现分层损伤现象,对疲劳性能有不利影响.

关键词：喷丸强化 CP800复相钢抗疲劳性能残余压应力

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膝关节前外侧旋转不稳定的诊断与治疗研究进展

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中华创伤骨科杂志 2024年第3期26卷 272-276页

作者：周毅强吴子英万方李宏陈天午戈允申厦门市中医院骨科厦门361009 复旦大学附属华山医院运动医学科上海200040

前交叉韧带、前外侧复合体和外侧半月板共同维持膝关节的前外侧旋转稳定性,控制胫骨内旋。临床上膝关节前外侧旋转不稳定并不少见,其主要损伤机制是非接触性损伤。轴移试验、胫骨内旋试验可提示前外侧旋转不稳定。X线片、CT、磁共振成... 详细信息

前交叉韧带、前外侧复合体和外侧半月板共同维持膝关节的前外侧旋转稳定性,控制胫骨内旋。临床上膝关节前外侧旋转不稳定并不少见,其主要损伤机制是非接触性损伤。轴移试验、胫骨内旋试验可提示前外侧旋转不稳定。X线片、CT、磁共振成像及超声检查可辅助诊断及鉴别诊断。对于急性前外侧旋转不稳定,良好的前交叉韧带重建技术是避免术后残留前外侧旋转不稳定的基础,前外侧韧带重建及关节外腱固定术可酌情选择;而对于慢性前外侧旋转不稳定,采用前外侧韧带重建或关节外腱固定术治疗均有效。本文对膝关节前外侧旋转不稳定的诊断与治疗研究进展进行综述,以期为临床诊治提供参考。

关键词：膝关节关节不稳定性诊断技术和方法治疗

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Overpressure Evolution Recorded in Fluid Inclusions in the Dongpu Depression,Bohai Bay Basin,North China

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Journal of Earth Science 2022年第4期33卷 916-932页

作者： Xiuyan Liu Honghan chen Xuewei Xiao Hongan Zhang Yuwei Wang tianwu Xu Pei Shang Lingtao Kong Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education China University of GeosciencesWuhan 430074China Zhongyuan Oilfield Company SINOPECPuyang 457001China Xianhe Production Factory Shengli Oilfield CompanySINOPECDongying 257086China State Key Laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China

The Dongpu depression,like other depressions in the Bohai Bay Basin,is characterized by overpressure,however,the published studies have not clearly given the overpressure formation mechanism and paleo-pressure evolution history in the Dongpu depression.In addition,the current researches are mainly focused on the northern Dongpu depression,while rare investigation has been conducted in the southern part.In this context,it is urgent to explore the comprehensive overpressure evolution and formation mechanism in the Dongpu depression in academic and industrial fields.This paper provided a systematic analysis of fluid inclusions,including fluid inclusion petrography,microthermometry,vapor phase filling degree measurement and PVT-x modeling.By using homogenization temperature-burial history projection,the trapping time of the oil inclusions are determined.Four pressure evolution stages are identified in both the northern and the southern Dongpu depression.The results indicate that the pressure accumulation stage is derived by disequilibrium compaction and hydrocarbon generation in the northern part because of the salt rock distribution,while the stage is only derived by hydrocarbon generation in the southern part because of no salt rock distribution.The pressure release stages are mainly caused by the tectonic uplifting movements at the end of Dongying and Minghuazhen Formation.The overpressure in most areas in the northern part has been preserved till now,which is considered as a result of the good plasticity and sealing ability of salt rock that prevent the pressure leakage by smearing on the fault.Areas without salt rock distribution show normal pressure,which means the salt rock is an important factor that contributes to the overpressure preservation.However,there are exceptions that in Baimiao and Qiaokou,the overpressure still exists even without salt rock distribution,which is due to fault closure.

关键词： PVT-x modeling burial history Shahejie Formation Paleogene fluid inclusion

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基线MRI列线图预测局部进展期直肠癌新辅助化疗反应的双中心研究

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国际医学放射学杂志 2024年第2期47卷 178-184页

作者：许敏程金梅周川沁园郭文文陈天武川北医学院附属医院放射科医学影像四川省重点实验室南充637000 四川省西充县人民医院放射科重庆医科大学附属第二医院放射科

目的构建基于基线MRI的列线图模型,对局部进展期直肠癌(LARC)新辅助化疗反应进行预测。方法回顾性收集2家医疗中心的142例接受新辅助化疗的连续性LARC病人的临床及MRI影像资料。中心1纳入116例病人,按照3∶1的比例随机分为训练集(87例)... 详细信息

目的构建基于基线MRI的列线图模型,对局部进展期直肠癌(LARC)新辅助化疗反应进行预测。方法回顾性收集2家医疗中心的142例接受新辅助化疗的连续性LARC病人的临床及MRI影像资料。中心1纳入116例病人,按照3∶1的比例随机分为训练集(87例)和内部验证集(29例);中心2纳入26例病人作为外部验证集。采用卡方检验、Fisher确切概率检验、独立样本t检验或Mann-Whitney U检验比较训练集的客观/缓冲率(ORR)组与非ORR组各观察指标的差异。采用单因素和多因素Logistic回归分析,筛选出预测LARC新辅助化疗反应的独立决定因素并构建列线图。采用受试者操作特征曲线(ROC)及曲线下面积(AUC)评估列线图预测LARC新辅助化疗反应的效能;采用校准曲线评估列线图的校准能力,采用决策曲线评估列线图模型的临床收益。结果训练集中ORR组与非ORR组cT分期、cN分期、直肠系膜筋膜(MRF)受侵、壁外血管侵犯(EMVI)、原发肿瘤体积(GTV)和肿瘤最大直径差异均有统计学意义(均P0.05)。训练集中单因素及多因素Logistic回归分析显示,cT分期、cN分期、EMVI和GTV为预测LARC新辅助化疗反应的独立决定因素(均P<0.05)。基于上述因素构建的列线图预测LARC新辅助化疗反应在训练集、内部验证集及外部验证集中的AUC分别为0.902、0.877和0.872。校准曲线显示,列线图预测LARC新辅助化疗反应的概率和实际结果一致性较好。决策曲线分析显示列线图能为LARC病人带来临床收益。结论基于cT分期、cN分期、EMVI和GTV构建的列线图能够对LARC病人新辅助化疗反应进行准确预测。

关键词：局部进展期直肠癌磁共振成像列线图新辅助化疗

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Nonlinear electronic and ultrafast optical signatures in chemical vapor-deposited ultrathin PtS_(2) ribbons

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Nano Research 2022年第5期15卷 4366-4373页

作者： Shaolong Jiang Jin Yang Liang Zhu Jiafeng Xie Weiteng Guo Erding Zhao Chaoyu chen tianwu Wang Fuhai Su Yanfeng Zhang Junhao Lin Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices and Department of Physics Southern University of Science and TechnologyShenzhen 518055China Key Laboratory of Materials Physics Institute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China Great Bay Area Research Institute Aerospace Information Research Institute(AIR)of Chinese Academy of Science(CAS)Guangzhou 510700China Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and TechnologyShenzhen 518055China International Quantum Academy and Shenzhen BranchHefei National LaboratoryFutian DistrictShenzhen 518048China School of Materials Science and Engineering Peking UniversityBeijing 100871China

The emerging two-dimensional(2D)platinum disulfide(PtS_(2))has driven increasing attentions due to its high electron mobility,good air-stability,and strong interlayer interaction which leads to a widely tunable electronic structure.However,a detailed study on its covalent-like layer-dependent properties remains infant.Herein,we demonstrate the successful production of ultrathin 1T-PtS_(2) ribbons with thickness centralized almost at monolayer 1L-4L and large domain size up to 210 μm on Au foils using chemical vapor deposition(CVD)technique,which enables macro-and microscopic study of its extraordinary layer-dependent features with precise control of the number of layers.Using electron energy loss spectroscopy(EELS)and optical pump-probe spectroscopy(OPPS),we reveal that both the electron and ultrafast optical absorption signals of the as-grown 2D PtS_(2) show strong nonlinear layer-dependent responses which manifest discriminated transition in 1L-4L PtS_(2) ribbons.The layer-dependent nonlinear response of 2D PtS_(2) can be well interpreted in the frame of calculated electron and phonon structures.These achievements offer a platform for successfully fabricating large-sized ultrathin 2D PtS_(2) and facilitating our knowledge about its electronic and optoelectronic properties.

关键词： platinum disulfide(PtS_(2)) chemical vapor deposition electronic transition saturable absorption optical pump-probe spectroscopy

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