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Experimental and Theoretical Study on Piezoresistive Behavior of Compressible Melamine Sponge Modified by Carbon-based Fillers

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Chinese Journal of Polymer Science 2022年第11期40卷 1503-1512页

作者： Xiao-Ling Luo dirk w.schubert Institute of Polymer Materials Friedrich-Alexander-University Erlangen-NurembergMartensstr.7Erlangen91058Germany KeyLab Advanced Fiber Technology Bavarian Polymer InstituteDr.Mack-Strasse 77Fürth90762Germany

High-performance compression sensors have been playing an increasingly important role in human motion detection,health monitoring and human-machine interfaces over recent ***,it remains a great challenge to develop theoretical models providing practical guidance to the sensor ***,carbon black(CB),carbon nanotubes(CNTs)and graphene nanoplatelets(GNPs)were respectively incorporated into porous melamine sponges by a facile approach of dip-coating to fabricate compression *** compression-resistance tests show that the compressibility,stability and piezoresistive sensitivity of sensors could be tailored by the filler type and concentration.A model considering the number of conductive pathways(NCP)is given to describe the relationship between the resistance change and applied compression,showing extremely good agreement with the experimental ***,the correlation between the equivalent filler volume fraction and conductivity is described by the other two models proposed by McLachlan and Kirkpatrick,revealing the electrical percolation thresholds(Φc)for the conductive systems under *** the three fillers,CB particles endowed the composite with the best piezoresistive sensitivity but the largestΦc due to its small size and aspect ratio.A combination of experimental study and theoretical model opens up a way of further understanding the piezoresistive sensing behavior as well as optimizing the electrical property and piezoresistivity of compressive conductive polymer composite.

关键词： Compression sensor Melamine sponge Model Piezoresistivity

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Ni Flower/MXene-Melamine Foam Derived 3D Magnetic/Conductive Networks for Ultra-Efficient Microwave Absorption and Infrared Stealth

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Nano-Micro Letters 2022年第4期14卷 142-157页

作者： Haoran Cheng Yamin Pan Xin wang Chuntai Liu Changyu Shen dirk w.schubert Zhanhu Guo Xianhu Liu Key Laboratory of Advanced Material Processing&Mold(Ministry of Education) National Engineering Research Center for Advanced Polymer Processing TechnologyCollege of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450002People’s Republic of China Institute of Polymer Materials Friedrich-Alexander-University Erlangen-NurembergMartensstr.791058 ErlangenGermany Integrated Composites Laboratory(ICL) Department of Chemical&Biomolecular EngineeringUniversity of TennesseeKnoxvilleTN 37996USA

The development of multifunctional and efficient electromagnetic wave absorbing materials is a challenging research ***,the magnetized Ni flower/MXene hybrids are successfully assembled on the surface of melamine foam(MF)through electrostatic self-assembly and dip-coating adsorption process,realizing the integration of microwave absorption,infrared stealth,and flame ***,the Ni/MXene-MF achieves a minimum reflection loss(RLmin)of−62.7 dB with a corresponding effective absorption bandwidth(EAB)of 6.24 GHz at 2 mm and an EAB of 6.88 GHz at 1.8 *** electromagnetic wave absorption is attributed to the three-dimensional magnetic/conductive networks,which provided excellent impedance matching,dielectric loss,magnetic loss,interface polarization,and multiple *** addition,the Ni/MXene-MF endows low density,excellent heat insulation,infrared stealth,and flame-retardant *** work provided a new development strategy for the design of multifunctional and efficient electromagnetic wave absorbing materials.

关键词： Ni-MXene/Melamine foam Microwave absorption Heat insulation Infrared stealth Flame-retardant

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Highly Sensitive Ultrathin Flexible Thermoplastic Polyurethane/Carbon Black Fibrous Film Strain Sensor with Adjustable Scaffold Networks

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Nano-Micro Letters 2021年第4期13卷 159-177页

作者： Xin wang Xianhu Liu dirk w.schubert Institute of Polymer Materials Friedrich-Alexander-University Erlangen-NurembergMartensstr.791058 ErlangenGermany National Engineering Research Center for Advanced Polymer Processing Technology Zhengzhou UniversityZhengzhou 450002People’s Republic of China Bavarian Polymer Institute Dr.Mack‑Strasse 7790762 FürthGermany

In recently years,high-performance wearable strain sensors have attracted great attention in academic and ***,a conductive polymer composite of electrospun thermoplastic polyurethane(TPU)fibrous film matrix-embedded carbon black(CB)particles with adjustable scaffold network was fabricated for high-sensitive strain *** work indicated the influence of stereoscopic scaffold network structure built under various rotating speeds of collection device in electrospinning process on the electrical response of TPU/CB strain *** structure makes the sensor exhibit combined characters of high sensitivity under stretching strain(gauge factor of 8962.7 at 155%strain),fast response time(60 ms),outstanding stability and durability(>10,000 cycles)and a widely workable stretching range(0–160%).This high-performance,wearable,flexible strain sensor has a broad vision of application such as intelligent terminals,electrical skins,voice measurement and human motion ***,a theoretical approach was used to analyze mechanical property and a model based on tunneling theory was modified to describe the relative change of resistance upon the applied ***,two equations based from this model were first proposed and offered an effective but simple approach to analyze the change of number of conductive paths and distance of adjacent conductive particles.

关键词： Strain sensor Electrospinning Electronic skin Fitting model

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Correction to: Ni Flower/MXene-Melamine Foam Derived 3D Magnetic/Conductive Networks for Ultra-Efficient Microwave Absorption and Infrared Stealth

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Nano-Micro Letters 2022年第7期14卷 177-178页

The original version of this article unfortunately contained some *** corrections are updated as follows:Error 1:we found that Equations 3,4 and 6 were wrong in the published paper:Error 2:In the page 7,“Since N Ni/MXene-MF possessed numer-ous heterogeneous interfaces and abundant functional groups,the dielectric loss mechanism was explored.”

关键词： Infrared correction dielectric

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Conductivity of Poly(methyl methacrylate)/Polystyrene/Carbon Black and Poly(ethyl methacrylate)/Polystyrene/Carbon Black Ternary Composite Films

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Chinese Journal of Polymer Science 2020年第3期38卷 288-297,I0007页

作者： Hua-Gen Xu Mu-Chao Qu Ya-Min Pan dirk wschubert Institute of Polymer Materials Friedrich-Alexander-University Erlangen-NurembergMartensstr.791058 ErlangenGermany College of Materials Science and Engineering The Key Laboratory of Material Processing and Mold of Ministry of EducationZhengzhou UniversityZhengzhou 450002China Bavarian Polymer Institute Dr.Mack-Strasse 7790762 FiirthGermany

Poly(methyl methacrylate)(PMMA)/polystyrene(PS)/carbon black(CB)and poly(ethyl methacrylate)(PEMA)/PS/CB ternary composite films were obtained using solution casting technique to investigate double percolation *** both PMMA/PS/CB and PEMA/PS/CB ternary composite films,the CB particles prefer to locate into PS phase based on the results of calculating wetting coefficient,which is also confirmed by SEM *** conductivity of the films was investigated,and the percolation threshold(￠c)of both ternary composite films with different polymer blend ratios was determined by fitting the McLachlan GEM *** of PMMA/PS/CB ternary composite films showed a typical double percolation ***,due to the double emulsion structure of PEMA/PS polymer blends,the PEMA/PS/CB ternary composite films(PEMA/PS=50/50)showed a higher￠c,even CB only located in PS phase,which conflicts with the double percolation effect.A schematic diagram combined with SEM images was proposed to explain this phenomenon.

关键词： Double percolation effect Conductivity Ternary composite films Compatibility

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Incorporation of bioactive glass nanoparticles in electrospun PCL/chitosan fibers by using benign solvents

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Bioactive Materials 2018年第1期3卷 55-63页

作者： Liliana Liverani Jonas Lacina Judith A.Roether Elena Boccardi Manuela S.Killian Patrik Schmuki dirk w.schubert Aldo R.Boccaccini Institute of Biomaterials Department of Materials Science and EngineeringUniversity of Erlangen-NurembergCauerstr.691058 ErlangenGermany Institute of Polymeric Materials Department of Materials Science and EngineeringUniversity of Erlangen-NurembergMartensstrasse 791058 ErlangenGermany LKO Department of Materials Science and EngineeringUniversity of Erlangen-NurembergMartensstrasse 791058 ErlangenGermany Department of Chemistry King Abdulaziz UniversityJeddahSaudi Arabia

The use of bioactive glass(BG)particles as a filler for the development of composite electrospun fibers has already been widely reported and *** novelty of the present research work is represented by the use of benign solvents(like acetic acid and formic acid)for electrospinning of composite fibers containing BG particles,by using a blend of PCL and *** this work,different BG particle sizes were investigated,namely nanosized and micron-sized.A preliminary investigation about the possible alteration of BG particles in the electrospinning solvents was performed using SEM *** obtained composite fibers were investigated in terms of morphological,chemical and mechanical *** in vitro mineralization assay in simulated body fluid(SBF)was performed to investigate the capability of the composite electrospun fibers to induce the formation of hydroxycarbonate apatite(HCA).

关键词： Green electrospinning Benign solvents Bioactive glass Composite PCL Chitosan Nanofibers

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纳米二氧化硅对PLA/PMMA共混物链缠结和流变性的影响

纳米二氧化硅对PLA/PMMA共混物链缠结和流变性的影响

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中国化学会第30届学术年会-第十七分会：流变学

作者：郝晓琼 Joachim Kaschta dirk w.schubert 于德梅 Institute of Polymer Materials Department of Materials ScienceUniversity Erlangen-Nuremberg 西安交通大学理学院应用化学系

在高分子材料中引入纳米颗粒不仅能够影响材料的机械性能,而且能显著改变材料加工过程中的流变性能。尤其对于高分子共混物,纳米颗粒还能够引起混合物相结构的改变。我们按照不同的质量百分比将未经处理的纳米二氧化硅(SiO)颗粒通过熔... 详细信息

在高分子材料中引入纳米颗粒不仅能够影响材料的机械性能,而且能显著改变材料加工过程中的流变性能。尤其对于高分子共混物,纳米颗粒还能够引起混合物相结构的改变。我们按照不同的质量百分比将未经处理的纳米二氧化硅(SiO)颗粒通过熔融共混的方法引入到相容的PLA/PMMA 50/50的共混物中。研究发现随着二氧化硅颗粒的加入,不仅共混物的玻璃化转变温度得到提高,而且其玻璃化转变区间也变大。扫描电镜(SEM)结果显示SiO增强的PLA/PMMA混合物的界面存在明显的"坑状"结构。根据对PLA/SiO,PMMA/SiO以及PLA/PMMA/SiO三种纳米复合材料的SEM和流变学实验结果的综合分析,我们认为PLA分子链能够选择性吸附在纳米二氧化硅颗粒周围,引起PLA/PMMA混合物在纳米尺度的局部非均质分布。此外,流变实验表明纳米二氧化硅的引入提高了PLA/PMMA共混物在熔融状态下的粘弹性以及相稳定性,并且提高了共混物中的链缠结点密度。

关键词：纳米颗粒流变性链缠结选择性吸附

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Epidemiology and risk factors for mortality in critically ill patients with pancreatic infection

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Journal of Intensive Medicine 2024年第1期4卷 81-93页

作者： Marie Dejonckheere Massimo Antonelli Kostoula Arvaniti Koen Blot Ben CreaghBrown Dylan wde Lange Jan De waele Mieke Deschepper Yalim Dikmen George Dimopoulos Christian Eckmann Guy Francois Massimo Girardis Despoina Koulenti Sonia Labeau Jeffrey Lipman Fernando Lipovestky Emilio Maseda Philippe Montravers Adam Mikstacki JoseArtur Paiva Cecilia Pereyra Jordi Rello JeanFrancois Timsit dirk Vogelaers Stijn Blot the Abdominal Sepsis Study(AbSeS)group on behalf of the Trials Group of the European Society of Intensive Care Medicine Department of Internal Medicine and Pediatrics Faculty of Medicine and Health SciencesGhent UniversityGhentBelgium Department of Anesthesiology Intensive Care and Emergency MedicineFondazione Policlinico Universitario A.Gemelli IRCCSRomeItaly UniversitàCattolica del Sacro Cuore RomeItaly Intensive Care Unit Papageorgiou University Affiliated HospitalThessaloníkiGreece Department of Epidemiology and Public Health SciensanoIxellesBelgium Surrey Perioperative Anaesthetic Critical Care Collaborative Research Group(SPACeR) Royal Surrey County HospitalGuildfordUK Department of Clinical and Experimental Medicine University of SurreyGuildfordUK Department of Intensive Care Medicine University Medical Center UtrechtUniversity UtrechtUtrechtthe Netherlands Department of Intensive Care Medicine Ghent University HospitalGhentBelgium Data Science Institute Ghent University HospitalGhentBelgium Department of Anesthesiology and Reanimation Cerrahpasa School of MedicineIstanbul University-CerrahpasaIstanbulTurkey rd Department of Critical Care “EVGENIDIO”HospitalNational and Kapodistrian University of AthensAthensGreece Department of General Visceral and Thoracic SurgeryKlinikum Hannoversch-MuendenGoettingen UniversityGöttingenGermany Division of Scientific Affairs-Research European Society of Intensive Care MedicineBrusselsBelgium Anesthesia and Intensive Care Department University Hospital of ModenaModenaItaly UQ Centre for Clinical Research Faculty of MedicineThe University of QueenslandBrisbaneQLDAustralia nd Critical Care Department Attikon University HospitalAthensGreece Department of Nursing Faculty of EducationHealth and Social WorkUniversity College GhentGhentBelgium Jamieson Trauma Institute The University of QueenslandBrisbaneQLDAustralia Nimes University Hospital University of MontpellierNimesFrance Critical Care Department Hospital of the Interamerican Open University(UAI)Buenos AiresArgentina Surgical Critical Care Department of AnesthesiaHospital Universitario

Background:The AbSeS-classification defines specific phenotypes of patients with intra-abdominal infection based on the(1)setting of infection onset(community-acquired,early onset,or late-onset hospital-acquired),(2)presence or absence of either localized or diffuse peritonitis,and(3)severity of disease expression(infection,sepsis,or septic shock).This classification system demonstrated reliable risk stratification in intensive care unit(ICU)patients with intra-abdominal *** study aimed to describe the epidemiology of ICU patients with pancreatic infection and assess the relationship between the components of the AbSeS-classification and ***:This was a secondary analysis of an international observational study(“AbSeS”)investigating ICU patients with intra-abdominal *** patients with pancreatic infection were included in this analysis(n=165).Mortality was defined as ICU mortality within 28 days of observation for patients discharged earlier from the *** with mortality were assessed using logistic regression analysis and reported as odds ratio(OR)and 95%confidence interval(CI).Results:The overall mortality was 35.2%(n=58).The independent risk factors for mortality included older age(OR=1.03,95%CI:1.0 to 1.1 P=0.023),localized peritonitis(OR=4.4,95%CI:1.4 to 13.9 P=0.011),and persistent signs of inflammation at day 7(OR=9.5,95%CI:3.8 to 23.9,Pwithin the first week(OR=4.0,95%CI:1.3 to 12.2,P=0.013).Gramnegative bacteria were most frequently isolated(n=58,49.2%)without clinically relevant differences in microbial etiology between survivors and ***:In pancreatic infection,a challenging source/damage control and ongoing pancreatic inflammation appear to be the strongest contributors to an unfavorable short-term *** this limited series,essentials of the AbSeS-classification,such as the setting of infection onset,diffuse

关键词： Pancreatic infection Intensive care unit Mortality Intra-abdominal infection Sepsis

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Public Charging Infrastructure in Germany–A Utilization and Profitability Analysis

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Journal of Modern Power Systems and Clean Energy 2022年第6期10卷 1750-1760页

作者： Benedict J.Mortimer Amandus Dominik Bach Christopher Hecht dirk Uwe Sauer Rik w.De Doncker Institute for Power Generation and Storage Systems at the E.ON Energy Research Center RWTH Aachen UniversityAachenGermany

The current increase in the number of electric vehicles in Germany requires an adequately developed charging *** numbers of public and semi-public charging stations are necessary to ensure sufficient coverage of charging *** order to make the installation worthwhile for the mostly private operators as well as public ones,a sufficient utilization is *** paper gives an overview of the differences in the utilization across the public charging infrastructure in *** this end,a dataset on the utilization of 21164 public and semi-public charging stations in Germany is *** installation and operating costs of various charging stations are modeled and economically evaluated in combination with the utilization *** is shown that in 2019-2020,the average utilization in Germany was rather low,albeit with striking regional *** consider future scenarios allowing the regional development forecasting of economic *** is demonstrated that a growth in electric mobility of 20%-30%per year leads to a large number of economically feasible charging parks in urban agglomeration areas.

关键词： Charging infrastructure charging station utilization electromobility economic analysis

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Biocompatibility and degradation comparisons of four biodegradable copolymeric osteosynthesis systems used in maxillofacial surgery: A goat model with four years follow-up

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Bioactive Materials 2022年第11期7卷 439-456页

作者： Barzi Gareb Nico Bvan Bakelen Leon Driessen Pieter Buma Jeroen Kuipers dirk w.Grijpma Arjan Vissink Ruud R.M.Bos Baucke van Minnen University of Groningen University Medical Center GroningenDepartment of Oral and Maxillofacial SurgeryHanzeplein 19713 GZP.O.Box 300019700 RBGroningenthe Netherlands Radboud University Medical Center Radboud Institute for Molecular Life SciencesOrthopaedic Research LabHoutlaan 46525 XZP.O.Box 91026500 HCNijmegenthe Netherlands University of Groningen University Medical Center GroningenDepartment of Biomedical Sciences of Cells and SystemsHanzeplein 19713 GZP.O.Box 300019700 RBGroningenthe Netherlands University of Twente TechMed CentreDepartment of Biomaterials Science and TechnologyDrienerlolaan 57522 NBP.O.Box 2177500 AEEnschedethe Netherlands

pplying biodegradable osteosyntheses avoids the disadvantages of titanium osteosyntheses. However, foreign-body reactions remain a major concern and evidence of complete resorption is lacking. This study compared the physico-chemical properties, histological response and radiographs of four copolymeric biodegradable osteo-synthesis systems in a goat model with 48-months follow-up. The systems were implanted subperiosteally in both tibia and radius of 12 Dutch white goats. The BioSorb FX [poly(70LLA-co-30DLLA)], Inion CPS [poly([70–78.5] LLA-co-[16–24]DLLA-co-4TMC)], Sonicweld Rx [poly(DLLA)], LactoSorb [poly(82LLA-co-18GA)] systems and a negative control were randomly implanted in each extremity. Samples were assessed at 6-, 12-, 18-, 24-, 36-, and 48-month follow-up. Surface topography was performed using scanning electron microscopy (SEM). Differential scanning calorimetry and gel permeation chromatography were performed on initial and explanted samples. Histological sections were systematically assessed by two blinded researchers using (polarized) light microscopy, SEM and energy-dispersive X-ray analysis. The Sonicweld Rx system was amorphous while the others were semi-crystalline. Foreign-body reactions were not observed during the complete follow-up. The Sonicweld Rx and LactoSorb systems reached bone percentages of negative controls after 18 months while the BioSorb Fx and Inion CPS systems reached these levels after 36 months. The Sonicweld Rx system showed the most predictable degradation profile. All the biodegradable systems were safe to use and well-tolerated (i.e., complete implant replacement by bone, no clinical or histological foreign body reactions, no [sterile] abscess formation, no re-interventions needed), but nanoscale residual polymeric fragments were observed at every system’s assessment.

关键词： Biocompatible materials Absorbable implants Polymers Orthopaedic fixation devices Reconstructive surgical procedures Fracture fixation

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