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Magnetoresponsive nanozyme:magnetic stimulation on the nanozyme activity of iron oxide nanoparticles

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Science China(Life Sciences) 2022年第1期65卷 184-192页

作者： Yuan He Xiaoyong Chen Ye Zhang Yanyun Wang Mengyao Cui Galong Li Xiaoli Liu Haiming Fan Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education College of Chemistry and Materials ScienceNorthwest UniversityXi’an 710127China Key Laboratory of Resource Biology and Biotechnology in Western China Ministry of Education/School of MedicineNorthwest UniversityXi’an 710069China

The iron oxide nanoparticles(IONPs)that combine the nanozyme activity and magnetothermal properties have attracted significant interest for various biomedical ***,the effect of magnetic stimulation in fine-tuning the nanozyme activities remains ***,we have constructed a series of IONPs with different magneto-thermal conversion abilities,and systematically study the effect of magnetic field stimulation on the peroxidase(POD)activity of *** results show that POD activity is effectively amplified via an in situ alternating magnetic field(AMF)stimulation with no solution temperature rise,and the degree of activity enhancement is closely related to the magnetic heating ability of the IONPs,confirming the origin of activity enhancement arises from the local magnetothermal *** the first report to prove magnetothermal regulation on nanozyme activity and to shed lights on the underlying correlation between activity enhancement and the intrinsic specific absorption rate(SAR),this work is expected to provide important support for future design of new magnetoresponsive nanozymes in various practical applications.

关键词： magnetoresponsive nanozyme magnetic stimulation specific absorption rate activity regulation

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Electromagnetic effects on the biological tissue surrounding a transcutaneous transformer for an artificial anal sphincter system

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2010年第12期11卷 931-936页

作者： Peng ZAN Bang-hua YANG Yong SHAO Guo-zheng YAN Hua LIU Shanghai Key Laboratory of Power Station Automation Technology College of Meehatronics Engineering and Automation Shanghai University Shanghai 200072 China School of Electronics Information and Electrical Engineering Shanghai Jiao Tong University Shanghai 200240 China

This paper reports on the electromagnetic effects on the biological tissue surrounding a transcutaneous transformer for an artificial anal *** coupling coils and human tissues,including the skin,fat,muscle,liver,and blood,were *** absorption rate (SAR) and current density were analyzed by a finite-length solenoid ***,SAR and current density as a function of frequency (10–107 Hz) for an emission current of 1.5 A were calculated under different tissue *** relations between SAR,current density,and five types of tissues under each frequency were *** a result,both the SAR and current density were below the basic restrictions of the International Commission on Non-Ionizing Radiation Protection (ICNIRP).The results show that the analysis of these data is very important for developing the artificial anal sphincter system.

关键词： Artificial anal sphincter Transcutaneous energy transmission Current density specific absorption rate

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Dual-Band Flexible MIMO Antenna with Self-Isolation Enhancement Structure for Wearable Applications

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Chinese Journal of Electronics 2023年第4期32卷 692-702页

作者： YANG Lingsheng XIE Yizhang JIA Hongting QU Meixuan LU Zhengyan LI Yajie Nanjing University of Information Science and Technology Kyushu University Zhongda Hospital Southeast University

A two-element dual-band flexible multiin multi-out antenna which can be used for wearable applications is proposed in this paper. The antenna consists of two radiating elements fed by coplanar waveguide, and a shielding layer, which are all made of flexible conductive cloth MKKTN260. Each radiating element is composed of two coupled split ring-shaped bending strips. The proposed antenna shows two measured impedance bandwidth(S1130 dB） has been achieved for both the bands. Other characteristics for wearable applications like gain, efficiency, specific absorption rate, and bending performances were also studied.

关键词： Structural rings Antenna measurements Impedance measurement Dual band Medical services Bending specific absorption rate

Epidermal radio frequency electronics for wireless power transfer

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Microsystems & Nanoengineering 2016年第1期2卷 52-60页

作者： Xian Huang Yuhao Liu Gil Woo Kong Jung Hun Seo Yinji Ma Kyung-In Jang Jonathan A.Fan Shimin Mao Qiwen Chen Daizhen Li Hank Liu Chuxuan Wang Dwipayan Patnaik Limei Tian Giovanni A.Salvatore Xue Feng Zhenqiang Ma Yonggang Huang John A.Rogers Department of Biomedical Engineering School of Precision Instrument and Opto-electronics EngineeringTianjin UniversityTianjin 300072China Department of Materials Science and Engineering University of Illinois at Urbana-ChampaignUrbanaIL 61801USA Department of Electrical and Computer Engineering University of Wisconsin-MadisonMadisonWI 53706USA Department of Civil and Environmental Engineering Northwestern UniversityEvanstonIL 60208USA Department of Engineering Mechanics Center for Mechanics and MaterialsTsinghua UniversityBeijing 100084China Department of Mechanical Engineering Northwestern UniversityEvanstonIL 60208USA Department of Robotics Engineering Daegu Gyeongbuk Institute of Science and TechnologyDaegu 42988Republic of Korea Department of Electrical Engineering Stanford UniversityStanfordCA 94305USA

Epidermal electronic systems feature physical properties that approximate those of the skin,to enable intimate,long-lived skin interfaces for physiological measurements,human–machine interfaces and other applications that cannot be addressed by wearable hardware that is commercially available today.A primary challenge is power supply;the physical bulk,large mass and high mechanical modulus associated with conventional battery technologies can hinder efforts to achieve epidermal characteristics,and near-field power transfer schemes offer only a limited operating *** we introduce an epidermal,farfield radio frequency(RF)power harvester built using a modularized collection of ultrathin antennas,rectifiers and voltage *** components,separately fabricated and tested,can be integrated together via methods involving soft contact *** studies of the individual components and the overall performance in various dielectric environments highlight the key operational features of these systems and strategies for their *** results suggest robust capabilities for battery-free RF power,with relevance to many emerging epidermal technologies.

关键词： antenna design epidermal electronics modularization silicon nanomembrane soft-contact lamination specific absorption rate wireless power

Enhanced Meander Antenna for Biomedical Implant Applications

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Journal of Sensor Technology 2024年第4期14卷 68-82页

作者： Pacôme Brou Alex Akohoule Dozohoua Silue Olivier Asseu Laboratoire of LASTIC Ecole Suprieure Africaine des Technologies de lInformation et de la Communication (ESATIC) Abidjan Cte dIvoire UMRI STI Institut National Polytechnique Houphout BOIGNY (INP-HB) Yamoussoukro Cte dIvoire

In this paper, a design of a miniature antenna for biomedical implant applications is presented. The proposed structure consists of a printed antenna designed to cover all frequency bands below 1 GHz and is dedicated to biomedical applications with good matching, omnidirectional radiation, and a maximum realized gain of −26.7 dBi. It offers two bandwidths of 270 MHz and 762 MHz respectively. A Phantom model of the elliptical cylinder of 180 × 100 × 50 mm3 was used to simulate the electromagnetic radiation inside the human body. The tissue considered is equivalent to a muscle with a relative permittivity of 57 and a conductivity equal to 0.79 S/m. We also studied the antenna behavior when close to the internal electronic components. The simulation showed that the antenna remains robust in such an environment. Finally, the specific absorption rate of the muscle was evaluated when the antenna was fed with 1 V. The evaluation proved that the calculated value of 0.48 W/Kg is well below the limit value imposed by the International Commission on Non-Ionizing Radiation Protection.

关键词： Implantable And Miniaturized Antenna Arcs Curved Antenna specific absorption rate Internal Electronic Components Biomedical Implants

Calculation of Electromagnetic Field and SAR Dis- tributions of Two Antenna Structures for Bone Tu- mors Microwave Hyperthermia

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Journal of Nanjing Medical University 2003年第3期17卷 143-148页

作者：席晓莉汪文秉王丽黎西安交通大学电子与信息工程学院微波工程与光通信研究所西安710049 西安理工大学自动化与信息工程学院电子科学与技术系

Objective: To investigate the electromagnetic field and specific absorptionrate (SAR) distribution of different structure applicators with different depths for treating bonetumors using microwave hyperthermia. Methods: The finite element method (FEM) was used to calculate,electromagnetic field and SAR distribution. Two different structure applicators were simulated. Theone is simple coaxial antenna, which has been successfully used in clinic treating bone tumors inTangdu hospital of the Forth Military Medical University several years. It was formed by a coaxialcable peeled off the out copper at end. The other applicator was coaxial- slot antenna, which waswidely used in microwave hyperthermia. The applicator inserted into the cylindrical bone withdifferent depths, and worked at the frequency of 2 450 MHz. Results: The electric field and SARgenerated by the simple coaxial applicator were mainly concentrated out the tissues, and were notuniform in the tissues, while the coaxial- slot applicator well transmits the electric field and SARinto the tissues, and can easily treat different position by adjusting the slat ***: The results calculated by EFM, were well accordant with the experimental and clinicalresulls, and will be important for improving the clinical effects of microwave hyperthermia.

关键词： bone tumors microwave hyperthermia finite element method electromagnetic field specific absorption rate

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