U. Martel, R. Albert, F. Blanchet, J. Griesmar, G. Ouellet, H. Therrien, N. Nehra, N. Bourlet, A. Peugeot, M. Hofheinz
We experimentally show that the inelastic cooper-pair tunneling amplifier (ICTA), implementing a DC-powered parametric amplification scheme, can achieve gain and noise performance similar to that of AC-powered Josephson parametric amplifiers. Using experimental data and simulations, we show that the ICTA has near-quantum-limited noise as long as low-frequency voltage noise, expressed as broadening of the Josephson frequency line, is narrower than the amplification bandwidth. We observe a gain of 20 dB across a 11 MHz bandwidth with noise below 1.7 times the quantum limit when the full width at half maximum of the Josephson frequency linewidth is 5.6 MHz.
{"title":"Influence of bias-voltage noise on the inelastic cooper-pair tunneling amplifier (ICTA)","authors":"U. Martel, R. Albert, F. Blanchet, J. Griesmar, G. Ouellet, H. Therrien, N. Nehra, N. Bourlet, A. Peugeot, M. Hofheinz","doi":"10.1063/5.0240842","DOIUrl":"https://doi.org/10.1063/5.0240842","url":null,"abstract":"We experimentally show that the inelastic cooper-pair tunneling amplifier (ICTA), implementing a DC-powered parametric amplification scheme, can achieve gain and noise performance similar to that of AC-powered Josephson parametric amplifiers. Using experimental data and simulations, we show that the ICTA has near-quantum-limited noise as long as low-frequency voltage noise, expressed as broadening of the Josephson frequency line, is narrower than the amplification bandwidth. We observe a gain of 20 dB across a 11 MHz bandwidth with noise below 1.7 times the quantum limit when the full width at half maximum of the Josephson frequency linewidth is 5.6 MHz.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"64 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143452104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Vortex acoustic fields are an emerging particle manipulation technique that gathers particles at a central zero-pressure point. Acoustic fields carrying orbital angular momentum (OAM) are reflected by hard boundaries, limiting their application within capillaries for aggregation of bioparticles in the cell analysis and biomolecule purification. We report a design for generating standing wave vortex acoustic fields within a capillary and investigate its effects on particle aggregation. The design uses a spiral phase helical tube placed outside the capillary to transfer elastic OAM to the fluid inside. Simulation results show that the first-order acoustic field is identical to the first-order Bessel beam and exhibits single vortex second-order acoustic streaming. In a background flow of 1×10−5 L/s, polystyrene particles with a diameter of 2 μm aggregated along a radial trajectory under the combined action of radial acoustic radiation force and tangential Stokes drag force. This method offers an efficient solution for the manipulation and detection of biological particles.
{"title":"Manipulating high-throughput microparticle aggregation in capillary via elastic-acoustics orbital angular momentum transfer","authors":"Musen Duan, Xuefeng Chen, Ying Guo, Shengchun Liu","doi":"10.1063/5.0243926","DOIUrl":"https://doi.org/10.1063/5.0243926","url":null,"abstract":"Vortex acoustic fields are an emerging particle manipulation technique that gathers particles at a central zero-pressure point. Acoustic fields carrying orbital angular momentum (OAM) are reflected by hard boundaries, limiting their application within capillaries for aggregation of bioparticles in the cell analysis and biomolecule purification. We report a design for generating standing wave vortex acoustic fields within a capillary and investigate its effects on particle aggregation. The design uses a spiral phase helical tube placed outside the capillary to transfer elastic OAM to the fluid inside. Simulation results show that the first-order acoustic field is identical to the first-order Bessel beam and exhibits single vortex second-order acoustic streaming. In a background flow of 1×10−5 L/s, polystyrene particles with a diameter of 2 μm aggregated along a radial trajectory under the combined action of radial acoustic radiation force and tangential Stokes drag force. This method offers an efficient solution for the manipulation and detection of biological particles.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"85 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143451557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Haiyan Fan, He Gao, Tuo Liu, Shuowei An, Yifan Zhu, Hui Zhang, Jie Zhu, Zhongqing Su
Recently, the concept of bound states in the continuum (BICs) has been extended to topological physics, inspiring investigations into higher-order topological BICs (TBICs) and related ultra-strong wave localization, which not only enriches the realm of topological physics but also bestows the BICs with inherent topological protection. However, previous explorations toward higher-order TBICs have been limited to the Hermitian assumption, omitting the nonconservative characteristics present in many artificial materials. In this work, we propose and experimentally demonstrate an acoustic lattice model supporting higher-order TBICs that solely rely on non-Hermiticity, in which the non-Hermiticity is implemented by strategically applying additional loss to specific sites in the lattice. Importantly, these in-band corner states are protected by chiral symmetry and can be spectrally switched by introducing perturbations to the corner sites or couplings. Our findings highlight the distinctive role of non-Hermiticity in constructing higher-order TBICs, which may inspire sophisticated and externally tunable approaches for designing high-Q devices in wave-based technologies.
{"title":"Acoustic non-Hermitian higher-order topological bound states in the continuum","authors":"Haiyan Fan, He Gao, Tuo Liu, Shuowei An, Yifan Zhu, Hui Zhang, Jie Zhu, Zhongqing Su","doi":"10.1063/5.0249792","DOIUrl":"https://doi.org/10.1063/5.0249792","url":null,"abstract":"Recently, the concept of bound states in the continuum (BICs) has been extended to topological physics, inspiring investigations into higher-order topological BICs (TBICs) and related ultra-strong wave localization, which not only enriches the realm of topological physics but also bestows the BICs with inherent topological protection. However, previous explorations toward higher-order TBICs have been limited to the Hermitian assumption, omitting the nonconservative characteristics present in many artificial materials. In this work, we propose and experimentally demonstrate an acoustic lattice model supporting higher-order TBICs that solely rely on non-Hermiticity, in which the non-Hermiticity is implemented by strategically applying additional loss to specific sites in the lattice. Importantly, these in-band corner states are protected by chiral symmetry and can be spectrally switched by introducing perturbations to the corner sites or couplings. Our findings highlight the distinctive role of non-Hermiticity in constructing higher-order TBICs, which may inspire sophisticated and externally tunable approaches for designing high-Q devices in wave-based technologies.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"14 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143451561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The scaling of the electron Mach number in a 20 A class hollow cathode plume is characterized experimentally as a function of the local plasma properties. These local properties are inferred from measurements with an incoherent Thomson scattering diagnostic, configured to measure the axial projection of the electron velocity distribution on the cathode centerline. The time-averaged electron temperatures are found to be 1–2 eV for xenon flow rates between 1.35 and 2.25 mg/s and increase above 5 eV at a lower flow rate of 0.45 mg/s. This transition in temperature corresponds to the cathode's transition from the so-called spot mode to the plume mode. The electron Mach number is found to be between 0.2 and 0.8 for all flow rates. The scaling of the Mach number with the ratio of electron temperature to ion temperature is examined, which reveals a non-monotonic relationship that can be approximately described by the assumption of marginally stable wave growth. The possibility of leveraging this assumption as a zero-equation closure for the electron fluid equations is discussed in the context of past experiments.
{"title":"Hollow cathode electron properties are consistent with marginally stable turbulence","authors":"P. J. Roberts, Z. A. Brown, B. A. Jorns","doi":"10.1063/5.0241476","DOIUrl":"https://doi.org/10.1063/5.0241476","url":null,"abstract":"The scaling of the electron Mach number in a 20 A class hollow cathode plume is characterized experimentally as a function of the local plasma properties. These local properties are inferred from measurements with an incoherent Thomson scattering diagnostic, configured to measure the axial projection of the electron velocity distribution on the cathode centerline. The time-averaged electron temperatures are found to be 1–2 eV for xenon flow rates between 1.35 and 2.25 mg/s and increase above 5 eV at a lower flow rate of 0.45 mg/s. This transition in temperature corresponds to the cathode's transition from the so-called spot mode to the plume mode. The electron Mach number is found to be between 0.2 and 0.8 for all flow rates. The scaling of the Mach number with the ratio of electron temperature to ion temperature is examined, which reveals a non-monotonic relationship that can be approximately described by the assumption of marginally stable wave growth. The possibility of leveraging this assumption as a zero-equation closure for the electron fluid equations is discussed in the context of past experiments.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"22 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143451513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zonghao Wu, Jiangsheng Yu, Wenxiao Wu, Zhenzhen Zhao, Siqi Ma, Beibei Shi, Rui Shi, Xin Liu, Yuguo Chen, Ziwu Ji, Feng Chen, Xiaotao Hao, Gang Li, Hang Yin
Semitransparent organic photovoltaics (ST-OPVs), due to their transparency, can be integrated into building designs through building integrated photovoltaics (BIPVs) to address the energy challenges posed by urbanization. While current BIPVs such as photovoltaic windows meet the criteria for both the power supply and urban esthetics, a crucial aspect remains underexplored in the existing research: the human experience under such modulated sunlight. In this study, we conduct a systematic analysis of the interaction between spectrally tunable ST-OPV materials and human cognition and emotion, proposing a framework for selecting user-friendly ST-OPVs. Our results reveal that predominant high-performance donor polymer materials negatively influence user emotions. To address this issue, we employed spectrum shaping optical structures to optimize the device transmittance and color rendering properties, to achieve desirable human emotion feedback. This groundbreaking study delves into the user experience of ST-OPV devices, playing a crucial role in addressing the energy demands of urbanization and paving the way for the realization of smart, sustainable, and healthy cities.
{"title":"Transforming semitransparent organic photovoltaics into catalysts for positive emotional responses","authors":"Zonghao Wu, Jiangsheng Yu, Wenxiao Wu, Zhenzhen Zhao, Siqi Ma, Beibei Shi, Rui Shi, Xin Liu, Yuguo Chen, Ziwu Ji, Feng Chen, Xiaotao Hao, Gang Li, Hang Yin","doi":"10.1063/5.0256211","DOIUrl":"https://doi.org/10.1063/5.0256211","url":null,"abstract":"Semitransparent organic photovoltaics (ST-OPVs), due to their transparency, can be integrated into building designs through building integrated photovoltaics (BIPVs) to address the energy challenges posed by urbanization. While current BIPVs such as photovoltaic windows meet the criteria for both the power supply and urban esthetics, a crucial aspect remains underexplored in the existing research: the human experience under such modulated sunlight. In this study, we conduct a systematic analysis of the interaction between spectrally tunable ST-OPV materials and human cognition and emotion, proposing a framework for selecting user-friendly ST-OPVs. Our results reveal that predominant high-performance donor polymer materials negatively influence user emotions. To address this issue, we employed spectrum shaping optical structures to optimize the device transmittance and color rendering properties, to achieve desirable human emotion feedback. This groundbreaking study delves into the user experience of ST-OPV devices, playing a crucial role in addressing the energy demands of urbanization and paving the way for the realization of smart, sustainable, and healthy cities.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"4 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143451560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lorenzo Gnoatto, Thomas Molier, Jelte J. Lamberts, Artim L. Bassant, Casper F. Schippers, Rembert A. Duine, Reinoud Lavrijsen
For magnonics and spintronics applications, the spin polarization (P) of a transport current and the magnetic damping (α) play a crucial role, e.g., for magnetization dynamics and magnetization switching applications. In particular, P in a glassy (amorphous) 3d transition ferromagnet such as CoFeB and α are both strongly affected by s−d scattering mechanisms. Hence, a correlation can be expected, which is a priori difficult to predict. In this work, P and α are measured using current-induced Doppler shifts using propagating spin wave spectroscopy and broadband ferromagnetic resonance techniques in blanket films and current-carrying CoxFe80−xB20 alloy microstrips. The measured P ranges from 0.18 ± 0.05 to 0.39 ± 0.05, and α ranges from (4.0 ± 0.2)·10−3 to (9.7 ± 0.6)·10−3. We find that for increasing P, a systematic drop in α is observed, indicating an interplay between magnetic damping and the spin polarization of the transport current, which suggests that interband scattering dominates in CoxFe80−xB20. Our results may guide future experiments, theory, and applications in advancing spintronics and metal magnonics.
{"title":"Investigating the interplay between spin polarization and magnetic damping in CoxFe80−xB20 for magnonics applications","authors":"Lorenzo Gnoatto, Thomas Molier, Jelte J. Lamberts, Artim L. Bassant, Casper F. Schippers, Rembert A. Duine, Reinoud Lavrijsen","doi":"10.1063/5.0254050","DOIUrl":"https://doi.org/10.1063/5.0254050","url":null,"abstract":"For magnonics and spintronics applications, the spin polarization (P) of a transport current and the magnetic damping (α) play a crucial role, e.g., for magnetization dynamics and magnetization switching applications. In particular, P in a glassy (amorphous) 3d transition ferromagnet such as CoFeB and α are both strongly affected by s−d scattering mechanisms. Hence, a correlation can be expected, which is a priori difficult to predict. In this work, P and α are measured using current-induced Doppler shifts using propagating spin wave spectroscopy and broadband ferromagnetic resonance techniques in blanket films and current-carrying CoxFe80−xB20 alloy microstrips. The measured P ranges from 0.18 ± 0.05 to 0.39 ± 0.05, and α ranges from (4.0 ± 0.2)·10−3 to (9.7 ± 0.6)·10−3. We find that for increasing P, a systematic drop in α is observed, indicating an interplay between magnetic damping and the spin polarization of the transport current, which suggests that interband scattering dominates in CoxFe80−xB20. Our results may guide future experiments, theory, and applications in advancing spintronics and metal magnonics.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"15 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143443911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Huimin Jiao, Jie Zhang, Tian Xing, Ruihua Zhao, Jianping Du
The electromagnetic wave pollution, originating from various electronic devices, has attracted widespread attention and has brought serious threats to human life. For this situation, the high-efficiency electromagnetic wave absorption (EMA) materials are required. Herein, carbon material modified with molybdenum dioxide is designed and synthesized by carbonizing the Mo-precursor. The Mo oxide/carbide-modified carbon materials are obtained by changing the raw material ratio and carbonized temperatures. The optimal material (MO-2-750) is composed of MoO2 and carbon with uniform nanotablet-like shapes and has excellent impedance matching. The maximum reflection loss of MO-2-750 is about −59.9 dB at a thickness of 2.2 mm, which is nearly 6 times that of carbon material. The effective absorption bandwidth is in the range of 11.29–17.32 GHz. This MoO2-modified carbon material could serve as an EMA platform in the electromagnetic wave absorption fields.
{"title":"MoO2-modified carbon nanotablets prepared by assembly of a polyoxomolybdate precursor for enhanced microwave absorption properties","authors":"Huimin Jiao, Jie Zhang, Tian Xing, Ruihua Zhao, Jianping Du","doi":"10.1063/5.0248212","DOIUrl":"https://doi.org/10.1063/5.0248212","url":null,"abstract":"The electromagnetic wave pollution, originating from various electronic devices, has attracted widespread attention and has brought serious threats to human life. For this situation, the high-efficiency electromagnetic wave absorption (EMA) materials are required. Herein, carbon material modified with molybdenum dioxide is designed and synthesized by carbonizing the Mo-precursor. The Mo oxide/carbide-modified carbon materials are obtained by changing the raw material ratio and carbonized temperatures. The optimal material (MO-2-750) is composed of MoO2 and carbon with uniform nanotablet-like shapes and has excellent impedance matching. The maximum reflection loss of MO-2-750 is about −59.9 dB at a thickness of 2.2 mm, which is nearly 6 times that of carbon material. The effective absorption bandwidth is in the range of 11.29–17.32 GHz. This MoO2-modified carbon material could serve as an EMA platform in the electromagnetic wave absorption fields.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"14 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143443912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Harvesting wideband and random vibration energy in the vehicle environment is a promising route to power mobile electronic devices. Conventional energy harvesters cannot realize steady-state output, making the energy management circuit design difficult. This work presents an electromagnetic harvester with a counterweight unit, a gearbox, and a generator, which can be adapted to wideband automatic energy storage and quantized output release. The counterweight unit with the low-frequency response can effectively sense the weak vibration. The coil spring in the energy storage gear train is in particular used to store low-frequency random vibration energy in the environment and release the energy stored by the coil spring by switching the gear train. Finally, the coil spring drives the generating gear train to realize the steady-state output of mechanical energy to electrical energy. At a frequency of 2.5 Hz and an acceleration of 0.4 g, the average output power of the automatic energy storage and steady-state output release energy harvester (ASSR) by using a coil spring to first store energy and then quantize the output is 114.5 times higher than that of the method of continuous generating without using a coil spring. The ASSR's energy output can charge the lithium battery (3.7 V, 40 mAh) from 2.6 to 3.716 V during a 60 km ride at an average speed of 12.7 km/h while powering the mobile phones and Bluetooth devices continuously through the energy management circuit. The strategy shows the great potential of micro-energy harvester in various wideband random vibration environments for powering electronics.
{"title":"An automatic energy storage and release high-performance micro-harvester with steady-state output for low-frequency random energy harvesting","authors":"Xiaoguang Song, Zhiqiang Lan, Kunru Li, Shuo Qian, Bing Han, Ruoyang Zhang, Pengfei Wu, Xiaojuan Hou, Jian He, Xiujian Chou","doi":"10.1063/5.0250922","DOIUrl":"https://doi.org/10.1063/5.0250922","url":null,"abstract":"Harvesting wideband and random vibration energy in the vehicle environment is a promising route to power mobile electronic devices. Conventional energy harvesters cannot realize steady-state output, making the energy management circuit design difficult. This work presents an electromagnetic harvester with a counterweight unit, a gearbox, and a generator, which can be adapted to wideband automatic energy storage and quantized output release. The counterweight unit with the low-frequency response can effectively sense the weak vibration. The coil spring in the energy storage gear train is in particular used to store low-frequency random vibration energy in the environment and release the energy stored by the coil spring by switching the gear train. Finally, the coil spring drives the generating gear train to realize the steady-state output of mechanical energy to electrical energy. At a frequency of 2.5 Hz and an acceleration of 0.4 g, the average output power of the automatic energy storage and steady-state output release energy harvester (ASSR) by using a coil spring to first store energy and then quantize the output is 114.5 times higher than that of the method of continuous generating without using a coil spring. The ASSR's energy output can charge the lithium battery (3.7 V, 40 mAh) from 2.6 to 3.716 V during a 60 km ride at an average speed of 12.7 km/h while powering the mobile phones and Bluetooth devices continuously through the energy management circuit. The strategy shows the great potential of micro-energy harvester in various wideband random vibration environments for powering electronics.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"111 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143443929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Baoyin Xu, Yue Zhou, Yaqi She, Zhanhui Ding, Yongfeng Li, Bin Yao, Hong-an Ma, Hongdong Li, Yucheng Lan
Exploring superhard materials is of great significance in materials research. Ternary B-C-N superhard compounds exhibit a superior thermal stability to diamond, with hardness surpassing cubic boron nitride. However, synthesizing cubic B-C-N compounds is challenging, and few studies have been reported on their high-temperature oxidation resistance, impeding their potential applications. In this study, cubic B-C-N compounds (c-BCN) were synthesized using the high-pressure high-temperature synthesis method at 10 GPa and 1530 °C, half the reported pressure and one-quarter lower than the reported temperature. The thermal stability of the obtained c-BCN compound was examined. The results indicated that the air oxidation temperature of c-BCN was as high as 1200 °C, suitable for high-speed cutting of hardened steels. This study provided a production method of cubic B-C-N superhard compounds and extended their potential applications to milling/machining.
{"title":"High-pressure high-temperature synthesis of cubic B-C-N compounds with high thermal stability","authors":"Baoyin Xu, Yue Zhou, Yaqi She, Zhanhui Ding, Yongfeng Li, Bin Yao, Hong-an Ma, Hongdong Li, Yucheng Lan","doi":"10.1063/5.0250854","DOIUrl":"https://doi.org/10.1063/5.0250854","url":null,"abstract":"Exploring superhard materials is of great significance in materials research. Ternary B-C-N superhard compounds exhibit a superior thermal stability to diamond, with hardness surpassing cubic boron nitride. However, synthesizing cubic B-C-N compounds is challenging, and few studies have been reported on their high-temperature oxidation resistance, impeding their potential applications. In this study, cubic B-C-N compounds (c-BCN) were synthesized using the high-pressure high-temperature synthesis method at 10 GPa and 1530 °C, half the reported pressure and one-quarter lower than the reported temperature. The thermal stability of the obtained c-BCN compound was examined. The results indicated that the air oxidation temperature of c-BCN was as high as 1200 °C, suitable for high-speed cutting of hardened steels. This study provided a production method of cubic B-C-N superhard compounds and extended their potential applications to milling/machining.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"81 4 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143443908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In recent years, thermal interface materials (TIMs) have garnered increasing attention in the field of thermal management for electronic devices. By effectively bridging the gap between electronic components and heat sinks, these materials significantly enhance heat transfer efficiency. This paper systematically reviews and analyzes the mechanisms, and the influencing factors associated with TIMs composed of graphene, carbon nanotubes, MXene, boron nitride compounds, and metal nanowires over recent years. Additionally, it delves into the challenges faced by these materials and explores its future research directions in thermal management. Future research endeavors are anticipated to focus on innovative designs for thermal conductivity networks in order to achieve further enhancements in the TIMs performance, ultimately paving the way for their practical application and commercialization.
{"title":"A perspective on mechanism of heat transfer and performance optimization in advanced thermal interface materials","authors":"Chen Liang, Jingtao Hong, Cheng Wan, Xinkai Ma, Zhiteng Wang, Xiuchen Zhao, Aijun Hou, Denis Nika, Yongjun Huo, Gang Zhang","doi":"10.1063/5.0250727","DOIUrl":"https://doi.org/10.1063/5.0250727","url":null,"abstract":"In recent years, thermal interface materials (TIMs) have garnered increasing attention in the field of thermal management for electronic devices. By effectively bridging the gap between electronic components and heat sinks, these materials significantly enhance heat transfer efficiency. This paper systematically reviews and analyzes the mechanisms, and the influencing factors associated with TIMs composed of graphene, carbon nanotubes, MXene, boron nitride compounds, and metal nanowires over recent years. Additionally, it delves into the challenges faced by these materials and explores its future research directions in thermal management. Future research endeavors are anticipated to focus on innovative designs for thermal conductivity networks in order to achieve further enhancements in the TIMs performance, ultimately paving the way for their practical application and commercialization.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"1 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143443931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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