Microscopic response mechanism of Epsilon-Negative and Epsilon-Near-Zero Metacomposites DOI Creative Commons
Yunlei Zhou, Yanan Wang, Shuai Qiu

et al.

Research, Journal Year: 2024, Volume and Issue: 8

Published: Dec. 10, 2024

Metals have traditionally served as the primary functional phase in development of metamaterials exhibiting epsilon-near-zero (ENZ) and epsilon-negative (EN) responses, albeit with persisting ambiguities regarding their response mechanisms. This paper presents tunable ENZ (ε' ~ 0) EN < parameters at 20-MHz to 1-GHz region based on Cu/CaCu3Ti4O12 (Cu/CCTO) metacomposites. By means first-principles calculations multi-physics simulations, underlying mechanisms governing responses are unveiled. The intricate pathways through which metacomposites achieve 2 dielectric delineated: At low Cu content, a weak (|ε'| 200) was excited by electric dipole resonance, accompanied effect; conversely, high due increase effective electron concentration, plasmonic oscillation behavior occurs constructed 3-dimensional network, resulting strong 1,000) radio frequency band. These phenomena explicated distinct Cu/CCTO models: an isolated state connected network state. study not only comprehensively elucidates achieved typical metals phases but also delves into associated electromagnetic shielding thermal properties, providing theoretical basis for practical applications.

Language: Английский

Machine learning‐assisted point‐of‐care diagnostics for cardiovascular healthcare DOI Creative Commons
Kaidong Wang, Bing Tan, Xinfei Wang

et al.

Bioengineering & Translational Medicine, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 3, 2025

Abstract Cardiovascular diseases (CVDs) continue to drive global mortality rates, underscoring an urgent need for advancements in healthcare solutions. The development of point‐of‐care (POC) devices that provide rapid diagnostic services near patients has garnered substantial attention, especially as traditional systems face challenges such delayed diagnoses, inadequate care, and rising medical costs. advancement machine learning techniques sparked considerable interest research engineering, offering ways enhance accuracy relevance. Improved data interoperability seamless connectivity could enable real‐time, continuous monitoring cardiovascular health. Recent breakthroughs computing power algorithmic design, particularly deep frameworks emulate neural processes, have revolutionized POC CVDs, enabling more frequent detection abnormalities automated, expert‐level diagnosis. However, privacy concerns biases dataset representation hinder clinical integration. Despite these barriers, the translational potential learning‐assisted presents significant opportunities CVDs healthcare.

Language: Английский

Citations

1
Nano carbon powder‐multiwalled carbon nanotubes/poly(vinylidene fluoride) percolating composites with low‐percolation binary functional phases and negative permittivity DOI Creative Commons

Guangyue Shi,

Yao Liu

Polymer Composites, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 14, 2025

Abstract Polymer percolating composites with negative permittivity via the construction of structures are great interest in electromagnetism. In this study, nano carbon powder‐multiwalled nanotubes/poly(vinylidene fluoride) (CP‐MWCNTs/PVDF) comprising binary functional phases CP‐MWCNTs were fabricated using hot‐pressing method. The achieved both low percolation threshold and tunable properties across entire frequency range testing. Percolation phenomenon was observed as content reaching 5 wt%, which reflected establishment network occurrence electrical percolation, resulting a shift toward metal‐like conduction mechanism. Additionally, notably can be ascribed to synergistic effect between phases. plasma oscillation free electrons within conductive plays crucial role achieving permittivity, that elucidated Drude model from electron theory. Furthermore, analyses impedance equivalent circuit illuminate connection dielectric behavior. These findings further reveal influence phases' morphology composition on behavior properties, while expanding application polymer‐based electromagnetic devices. Highlights Tunable related is achieved. Binary exhibit threshold. Synergistic leads

Language: Английский

Citations

0
Adjustable and weak negative permittivity behavior in carbon nanofiber/poly(vinylidene fluoride) metacomposites DOI Creative Commons
Rongwei Ma, Jia Li, Zhiyuan Hu

et al.

Polymer Composites, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 6, 2025

Abstract Metacomposites with negative permittivity have advanced significantly in recent years, and yet the weak behavior is still not easily adjusted, which obstructs advancement of metacomposites electronic devices. Herein, poly(vinylidene fluoride) (PVDF) composites different carbon nanofiber (CNF) contents were prepared to explore regulatory mechanism behavior. As CNF low, long‐range isolated nanofibers endowed hopping conductance, capacitance characteristic positive permittivity. When reached percolation threshold, many close contact enough conductive network was formed generate metal‐like conductivity, inductance Interestingly, a could be realized high (5.94 ~ 17.48 wt%), its magnitude precisely adjusted (−60 −538). The imputed suppressed low‐frequency plasma state free electron sparse network. PVDF impede formation tunneling effect between adjacent nanofibers, thus weakly dependent on content. These findings suggested that affected by synergistic both filler insulating matrix, offering new thread researches adjusting Highlights observed CNF/PVDF composites. adjusted. Adjustable well explained Drude model.

Language: Английский

Citations

0
Investigation of The Dielectric Properties of Materials Obtained by Substituting The Ca2+ Ion in The Compound CaCu3Ti4O12 with Na+ and Bi3+ Ions DOI

A.A. Muradyan,

A. R. Aramyan,

H.A. Alexanyan

et al.

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment, Journal Year: 2025, Volume and Issue: unknown, P. 170452 - 170452

Published: March 1, 2025

Language: Английский

Citations

0
Metal-based nanocomposites for immunotherapy of osteosarcoma DOI

Puhua Hao,

Lulu Yang, Yichen Yan

et al.

Advanced Composites and Hybrid Materials, Journal Year: 2024, Volume and Issue: 7(6)

Published: Oct. 23, 2024

Language: Английский

Citations

3
Modified Negative Permittivity and X-band Microwave Absorption in Polyvinyl Alcohol–MWCNT Metacomposites DOI

P Swetha,

Sindhu Swaminathan, Kishore Sridharan

et al.

Composites Communications, Journal Year: 2024, Volume and Issue: 52, P. 102161 - 102161

Published: Nov. 13, 2024

Language: Английский

Citations

1
Epsilon-near-zero and magnetically driven properties for medium-entropy FeCoNi alloy particle-doped CNTs and their derivatives DOI
Xinxue Tang, Yunchen Long,

Jing Zhong

et al.

Advanced Composites and Hybrid Materials, Journal Year: 2024, Volume and Issue: 8(1)

Published: Dec. 13, 2024

Language: Английский

Citations

1
Precisely tuning ε′-negative and ε′-near-zero responses by synergistic effect of graphene and carbon black in ternary metacomposites DOI
Xinxue Tang,

Ye Wu,

Jie Li

et al.

Diamond and Related Materials, Journal Year: 2024, Volume and Issue: 150, P. 111758 - 111758

Published: Nov. 7, 2024

Language: Английский

Citations

0
A multitasking renal function assessment Janus biosensor based on photonic spin Hall effect at epsilon-near-zero threshold frequency of YaBa2Cu3O7 ceramic material DOI
Jun-Yang Sui, Du Rui, Si‐Yuan Liao

et al.

Ceramics International, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 1, 2024

Language: Английский

Citations

0
Concept for a geometry-insensitive high-field magnetic resonance detector DOI Creative Commons

Khai Chau-Nguyen,

Vlad Badilita, Jan G. Korvink

et al.

Engineering With Computers, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 19, 2024

Abstract We introduce an inverse design methodology for a new class of eigenfrequency-invariant metamaterial-resonators, targeting nuclear magnetic resonance detection at ultra-high $$\mathbf {B_0}$$ B 0 field, and operating two specified frequencies selected from within the 100-1500 MHz range. The primary optimisation goal is to maximise field intensity uniformity liquid sample, while electric energy should be kept minimum level reduce dielectric heating or quadrupolar moment excitation effects. Due symmetric geometry requirement cavity, demultiplexer also designed direct each discrete resonant signal another predetermined output port resonator. In order geometrical dependency frequency, bespoke metamaterial used cavity host. Therefore, additional problem unit cell domain defined seek proper material layout host region resonators. Given sensitivity frequency domain, process effectively regulated through utilisation both Helmholtz filter projection method. It found that considerable improvements resonator quality factor can obtained this process.

Language: Английский

Citations

0