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Effect of an External Electric Field on the Performance of an Electroosmotically-Driven Micromixer with Triangular-Shaped Electrodes: Design and Simulation 外电场对三角电极电渗透驱动微混合器性能的影响：设计与仿真

IF 1.4 4区化学

Russian Journal of Physical Chemistry B Pub Date : 2025-09-09 DOI: 10.1134/S1990793125700642

Elnaz Poorreza

{"title":"Effect of an External Electric Field on the Performance of an Electroosmotically-Driven Micromixer with Triangular-Shaped Electrodes: Design and Simulation","authors":"Elnaz Poorreza","doi":"10.1134/S1990793125700642","DOIUrl":"10.1134/S1990793125700642","url":null,"abstract":"An electroosmosis micromixer is an essential element within microfluidic systems, designed to effectively facilitate the mixing of fluids at the microscale. These devices are essential across various scientific disciplines, such as chemistry, biology, and medicine, due to their ability to manipulate minute volumes with extraordinary precision and minimal reagent loss. Electroosmosis can be defined as the movement of fluids through micro/nano-channels, driven by an externally applied electric field. In the current investigation, a micromixer that is driven by electroosmosis phenomena, has been developed to combine two disparate fluids, which are introduced into the system through separate inlets, resulting in a combined microchannel. To improve this mixing system, a sinusoidal electric potential is systematically applied across the triangular-shaped electrodes, characterized by a peak value of 0.1 V and an operational frequency of 8 Hz. The simulation results obtained from this configuration indicate that the micromixer demonstrates an exceptional mixing efficiency approaching a value of 0.96, thereby highlighting its considerable potential for beneficial applications across a diverse array of fields, particularly within microfluidics, biochemistry, and biomedical sciences.","PeriodicalId":768,"journal":{"name":"Russian Journal of Physical Chemistry B","volume":"19 4","pages":"1003 - 1010"},"PeriodicalIF":1.4,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145011655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Correction: Controlled quantum communication using quantum walk 修正：使用量子行走控制量子通信

IF 2.2 3区物理与天体物理

Quantum Information Processing Pub Date : 2025-09-09 DOI: 10.1007/s11128-025-04930-3

Subham Das, A. V. N. S. Meghnath, Rajiuddin Sk, Prasanta K. Panigrahi

引用次数: 0

Temperature-dependent electrostatic, linearity, and analog/RF performance of GaN HEMT GaN HEMT的温度依赖性静电、线性和模拟/射频性能

IF 2.8 4区工程技术

Journal of Materials Science: Materials in Electronics Pub Date : 2025-09-09 DOI: 10.1007/s10854-025-15753-4

Sabrina Alam, Christophe Gaquiere, Mohammad Abdul Alim

{"title":"Temperature-dependent electrostatic, linearity, and analog/RF performance of GaN HEMT","authors":"Sabrina Alam, Christophe Gaquiere, Mohammad Abdul Alim","doi":"10.1007/s10854-025-15753-4","DOIUrl":"10.1007/s10854-025-15753-4","url":null,"abstract":"<div>Temperature has a major impact on the performance and reliability of high-frequency AlGaN/GaN HEMTs for high-power applications. Despite substantial research, these devices’ multi-bias behavior throughout a wide temperature range is still poorly understood. This study investigates DC, electrostatic, nonlinear, and analog/RF parameters from − 40 to 150 ℃ to fill this gap. The performance of GaN HEMT was evaluated by examining ON/OFF-state currents, subthreshold features, transconductance (gm), and its derivative, along with related parameters such as IMD3, 1-dB CP, and THD, which were evaluated together with RF performance indicators, including gain (Av) and gate-to-drain capacitance (Cgd). The transconductance generating factor (TGF), together with the product such as gain frequency (GFP), gain bandwidth (GBW), transconductance frequency (TFP), and gain transconductance frequency (GTFP), was also investigated. Among the electrostatic performance parameters, the currents in the ON state decreased, and the OFF state displayed an increasing trend as the temperature increased. The S-slope and S-swing, on the other hand, show a reverse trend with temperature. Both the current and the gm, along with its derivatives (gm2 and gm3), exhibit a declining trend as the temperature increases. The nonlinear performance of VIP2, VIP3, IIP3, 1-dB CP, IMD3, and THD, which rely on gm,is decreased with temperature. In terms of RF parameters, the Av, Cgd, ft, and fmax, as well as the TGF and GFP, are found to decrease with temperature. Meanwhile, the GBW, TFP, and GTFP all demonstrate an increasing trend with temperature. These findings provide valuable insights into the thermal impact on device parameters, which can be utilized to promote state-of-the-art technologies for the present and forthcoming deployments.</div>","PeriodicalId":646,"journal":{"name":"Journal of Materials Science: Materials in Electronics","volume":"36 25","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145011915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Structure of Macroporous Carbon-Carbon Composite Obtained by Deposition of Pyrolytic Carbon on a Carbon Black Matrix 热解碳在炭黑基体上沉积制备的大孔碳-碳复合材料的结构

IF 0.9 4区工程技术

Solid Fuel Chemistry Pub Date : 2025-09-09 DOI: 10.3103/S0361521925700247

O. A. Knyazheva, A. V. Lavrenov, M. V. Trenikhin, O. V. Gorbunova, O. A. Kokhanovskaya, O. N. Baklanova, T. I. Gulyaeva, I. V. Muromtsev, R. M. Mironenko, A. B. Arbuzov

{"title":"Structure of Macroporous Carbon-Carbon Composite Obtained by Deposition of Pyrolytic Carbon on a Carbon Black Matrix","authors":"O. A. Knyazheva, A. V. Lavrenov, M. V. Trenikhin, O. V. Gorbunova, O. A. Kokhanovskaya, O. N. Baklanova, T. I. Gulyaeva, I. V. Muromtsev, R. M. Mironenko, A. B. Arbuzov","doi":"10.3103/S0361521925700247","DOIUrl":"10.3103/S0361521925700247","url":null,"abstract":"Macroporous carbon materials (macro-PCMs) were obtained using a matrix synthesis approach which consists in the deposition of pyrolytic carbon (PC) on a matrix of P803 carbon black (CB) during its high-temperature treatment in hydrocarbon medium. The microstructure, morphology, and porous structure of synthesized macro-PCMs were studied using a set of methods, such as transmission and scanning electron microscopy, X-ray diffraction, Raman spectroscopy, low-temperature nitrogen adsorption, mercury porosimetry, and helium pycnometry. It was shown that PC is deposited on the CB matrix surface both in the form of ordered graphene layers and as wedge-shaped particles. Two stages of the macro-PCM formation can be distinguished. At the first stage (α < 0.66 g of PC per g of CB), the most accessible macropores with sizes of >100 nm are predominantly filled with PC and then, at the second stage (α > 0.66 g of PC per g of CB), pores with sizes of <100 nm are also filled. A decrease in the specific pore volume V>100 from 0.48 to 0.26 cm3/gCB occurs with volumetric filling of large macropores (>100 nm) between aggregates, while the PC deposition at α > 0.66 g/g leads to a decrease in V<100 to 0.077 cm3/gCB and to an almost constant value for V>100.","PeriodicalId":779,"journal":{"name":"Solid Fuel Chemistry","volume":"59 5","pages":"345 - 354"},"PeriodicalIF":0.9,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145011516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of the Divalent Metal Ions on Lecithin Liposomes 二价金属离子对卵磷脂脂质体的影响

IF 1.4 4区化学

Russian Journal of Physical Chemistry B Pub Date : 2025-09-09 DOI: 10.1134/S1990793125700575

L. N. Shishkina, P. D. Beletskaya, A. S. Dubovik, A. V. Mashukova, V. O. Shvydkiy

{"title":"Effects of the Divalent Metal Ions on Lecithin Liposomes","authors":"L. N. Shishkina, P. D. Beletskaya, A. S. Dubovik, A. V. Mashukova, V. O. Shvydkiy","doi":"10.1134/S1990793125700575","DOIUrl":"10.1134/S1990793125700575","url":null,"abstract":"The mechanism of participation of MnCl2, ZnCl2, CdCl2 and PbCl2 salts in different stages of lipid peroxidation (LP) processes in liposomes formed from natural lipids (lecithin of soybeans) in distilled water was studied, using mathematical processing of UV-spectra of liposomes and their mixtures of metal ions by the Gauss method in combination with the study of the effect of metal ions on spontaneous aggregation of liposomes (dynamic light scattering method) and the intensity of bacterial bioluminescence. While all metal ions at the studied concentration of 10–4 mol/L are considered as damaging substances for biological systems, the degree of toxicity of both pollutants (Pb2+ and Cd2+) and biogenic manganese and zinc ions is due to differences in their participation in the regulation of LP processes. Thus, the biological effectiveness of Cd2+ is mainly related to its ability to initiate LP. The Pb2+ affects its inhibitory effect on LP by forming complexes with the polar groups of phospholipids, the diene conjugates, and the ketodiene fatty acids found within liposomes. Mn2+ inhibits LP by forming complexes with ketodiene fatty acids and phosphate groups of phospholipids, while Zn2+ affects the structural state of liposomes by forming complexes with phosphate groups of phospholipids and diene conjugates.","PeriodicalId":768,"journal":{"name":"Russian Journal of Physical Chemistry B","volume":"19 4","pages":"914 - 920"},"PeriodicalIF":1.4,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145011634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on Nitrogen Doped Hollow Cubic Carbon Electromagnetic Wave Absorbing Materials 氮掺杂空心立方碳电磁波吸波材料的研究

IF 1.4 4区化学

Russian Journal of Physical Chemistry B Pub Date : 2025-09-09 DOI: 10.1134/S199079312570054X

F. H. Huang, F. Yan, Z. J. Jing, J. W. Wen, S. Y. Li, Y. Chen

{"title":"Study on Nitrogen Doped Hollow Cubic Carbon Electromagnetic Wave Absorbing Materials","authors":"F. H. Huang, F. Yan, Z. J. Jing, J. W. Wen, S. Y. Li, Y. Chen","doi":"10.1134/S199079312570054X","DOIUrl":"10.1134/S199079312570054X","url":null,"abstract":"Carbon based materials have the characteristics of light weight, adjustable dielectric and stable performance, so they have become the most concerned wave absorbing materials. In this paper, phenolic resin was prepared with sodium chloride as template, and then L-lysine as nitrogen source was used to add nitrogen into phenolic resin, and the final nitrogen doped hollow cubic carbon material was obtained by etching after carbonization. During the experiment, the material with excellent wave absorbing performance was prepared by controlling the doping amount of nitrogen element. Finally, it was found that the nitrogen-doped hollow cubic carbon wave absorbing material could obtain the best reflection loss of –50.26 dB and the maximum effective bandwidth of 4.68 GHz at the extremely low load of 1.75 wt %. The one-component wave absorbing material can have good absorbing performance under very low load, which can become the best candidate material for lightweight and efficient electromagnetic wave absorber without adding other materials, and achieve the purpose of “wide, strong, light and thin.”","PeriodicalId":768,"journal":{"name":"Russian Journal of Physical Chemistry B","volume":"19 4","pages":"844 - 852"},"PeriodicalIF":1.4,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145011859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Groundwater quality assessment and subsurface mapping at a reclaimed waste dumpsite in Enugu, Nigeria: implications for sustainable urban development 尼日利亚埃努古一个回收垃圾场的地下水质量评估和地下测绘：对可持续城市发展的影响

IF 1.827

Arabian Journal of Geosciences Pub Date : 2025-09-09 DOI: 10.1007/s12517-025-12300-7

Ani D. Chinedu, Pele A. Egbagiri, Lawal A. Opotu, Chukwudike Okeugo, Chidiebere Obasi

{"title":"Groundwater quality assessment and subsurface mapping at a reclaimed waste dumpsite in Enugu, Nigeria: implications for sustainable urban development","authors":"Ani D. Chinedu, Pele A. Egbagiri, Lawal A. Opotu, Chukwudike Okeugo, Chidiebere Obasi","doi":"10.1007/s12517-025-12300-7","DOIUrl":"10.1007/s12517-025-12300-7","url":null,"abstract":"<div>This study assesses groundwater Quality and subsurface lithology in a residential area built on a reclaimed municipal waste dumpsite in Enugu, Nigeria. It addresses the potential environmental and health impacts of such sites, aligning with SDG 6 (Clean Water and Sanitation) and SDG 11 (Sustainable Cities and Communities). The objectives include groundwater Quality evaluation, subsurface characterization, and groundwater suitability assessment. Water samples from hand-dug wells were collected during both rainy and dry seasons over 2 years. Electrical Resistivity Tomography (ERT) was employed to identify subsurface leachate pathways, while Atomic Absorption Spectrometry (AAS) was used to analyze eight heavy metals and 13 physicochemical parameters for groundwater quality index (WQI) calculation. ERT results revealed zones of low resistivity (0.5–7 Ωm) at depths of 5–16 m, indicating leachate presence. These zones were bordered by moderately resistive lateritic materials (58–199 Ωm). Most parameters fell within WHO permissible limits, except for cadmium (dry, 0.02 mg/L; wet, 0.17 mg/L), cobalt (dry, 0.02 mg/L; wet, 0.04 mg/L), temperature (dry, 28 °C; wet, 25 °C), and TSS (dry, 290 mg/L; wet, 110 mg/L). During the dry season, lead (0.15 mg/L) and total solids (TS) (720 mg/L) exceeded acceptable limits. pH values were slightly acidic, ranging from 5.0 (dry) to 5.5 (wet). The WQI scores of 987 (dry) and 3005 (wet) indicated high contamination in both seasons. Statistical analysis showed no significant seasonal variation in contaminant levels. Overall, geophysical and laboratory findings confirm that the groundwater is highly contaminated and poses serious health risks to residents.\u0000</div>","PeriodicalId":476,"journal":{"name":"Arabian Journal of Geosciences","volume":"18 10","pages":""},"PeriodicalIF":1.827,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145011969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Metal-MXene-Metal based multilayered metamaterial ultrawideband absorber for thermal and solar absorption applications 金属- mxene -金属基多层超材料超宽带吸收体，用于热吸收和太阳能吸收

IF 2.8 4区材料科学

Applied Physics A Pub Date : 2025-09-09 DOI: 10.1007/s00339-025-08890-4

Vishal Sorathiya, Jusu M. Ngobeh, Abdullah G. Alharbi, Ahmad Alghamdi, Amar Y. Jaffar

{"title":"Metal-MXene-Metal based multilayered metamaterial ultrawideband absorber for thermal and solar absorption applications","authors":"Vishal Sorathiya, Jusu M. Ngobeh, Abdullah G. Alharbi, Ahmad Alghamdi, Amar Y. Jaffar","doi":"10.1007/s00339-025-08890-4","DOIUrl":"10.1007/s00339-025-08890-4","url":null,"abstract":"<div>We proposed a numerical investigation of a metal-MXene-metal-based metamaterial thermal absorber for the wide solar spectrum band. The proposed absorber is formed using the MXene material and a single array, as well as a 2 × 2 resonator array-based metal structure. The proposed structure was numerically investigated for different physical, metamaterial, and thermal parameters across the 0.1 μm to 3.3 μm wavelength spectrum. The optimized parameters of the proposed structure yield a minimum and maximum absorption amplitude of 80% and > 99%, respectively, across the entire wavelength spectrum. The metamaterial absorber design also demonstrates the stability of the spectrum’s oblique angle incident up to 60 °. The effect of different optical parameters, such as refractive index, permittivity, and permeability, is demonstrated through the metamaterial behavior over the computed wavelength spectrum band for the proposed multilayered metamaterial absorber structure. This structure is also compared with the interference mode theory calculation to identify the structure’s overall absorption profile, which shows a variation of 10–20% in overall amplitude. This structure was also analysed for various thermal efficiency parameters, including spectral irradiance with AM1.5 and thermal radiation efficiency, as well as physical parameters such as unit cell length and temperature. The proposed structure can be crucial for designing parasitic solar absorber structures suitable for thermal systems and solar cell applications.</div>","PeriodicalId":473,"journal":{"name":"Applied Physics A","volume":"131 10","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145011466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modeling aspects of excluded volume and hydrodynamic interactions in dissipative particle dynamics simulations of highly resolved polymer chains in flow fields 流场中高分辨率聚合物链耗散粒子动力学模拟中排除体积和流体动力相互作用的建模方面

IF 2.8 4区化学

Journal of Polymer Research Pub Date : 2025-09-09 DOI: 10.1007/s10965-025-04562-2

Sanjay Jana, Venkata Siva Krishna, Praphul Kumar, Indranil Saha Dalal

{"title":"Modeling aspects of excluded volume and hydrodynamic interactions in dissipative particle dynamics simulations of highly resolved polymer chains in flow fields","authors":"Sanjay Jana, Venkata Siva Krishna, Praphul Kumar, Indranil Saha Dalal","doi":"10.1007/s10965-025-04562-2","DOIUrl":"10.1007/s10965-025-04562-2","url":null,"abstract":"<div>Even though the Dissipative Particle Dynamics (DPD) technique has shown its worth in a variety of research areas, it has been rarely used for polymer dynamics, particularly in dilute and semi-dilute conditions and under imposed flow fields. For such applications, the most popular technique has been Brownian dynamics (BD), even though the formulation of the same may be complicated for flow in complex geometries, which is straightforward for DPD. This is partly due to the flexibility of BD simulations to mimic any dynamic regime for polymer solutions by independently tuning hydrodynamic interactions (HI) and excluded volume (EV). In this study with highly resolved polymer chains, we reveal that DPD also offers a similar flexibility and the regimes with respect to dominant EV and HI can be selected as conveniently as BD. This flexibility is achieved by tuning the repulsive interaction parameter of polymer beads and the spring length. Any rheological regime of certain level of EV and HI can be attained by appropriately tuning only these two parameters, providing a flexibility of similar levels as BD simulations. We further highlight the suitability of DPD by comparing predictions with equivalent models in BD, for highly resolved chains in flow fields. For this, we imposed startup uniaxial extensional flows and steady shear flows on the system. Our results indicate the consistency of DPD with BD simulations, which is known to agree well with experiments. Finally, we provide a simple analytical estimate of the level of HI in any DPD simulation, as a function of relevant DPD parameters.</div>","PeriodicalId":658,"journal":{"name":"Journal of Polymer Research","volume":"32 9","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145011519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Anionic Surfactant Additives on the Surface Characteristics of Solutions of Dicationic Diimidazolium Surfactants with Short Spacer Fragments 阴离子表面活性剂添加剂对短间隔片段双咪唑表面活性剂溶液表面特性的影响

IF 1.1 4区化学

Colloid Journal Pub Date : 2025-09-09 DOI: 10.1134/S1061933X2560099X

S. L. Khil’ko, A. A. Kotenko

引用次数: 0