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Broadband mid-infrared thermal emission with large degree of circular polarization enabled by symmetry-broken metasurfaces 对称性破缺元表面实现大圆极化度的宽带中红外热发射
IF 8 3区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-04-16 DOI: 10.1016/j.jsamd.2024.100724
Qianlong Kang , Guoqing Xu , Xizheng Zhang , Wei Wang , Kai Guo , Zhongyi Guo

Mid-infrared (MIR) circularly polarized emission (CPE) is widely used in molecular sensing, information encryption, target detection, and optical communication. However, the generation and regulation of broadband MIR thermal emission with a large degree of circular polarization (DoCP) is still a major challenge. Here, we design a symmetry-broken chiral plasmonic metasurface consisting of asymmetric spilted-ring resonators (ASRRs) to emit broadband CPE with high purity in the MIR region of 3.4–5 μm. The simulated results show that the DoCPs at the wavelengths of 3.74 μm and 4.27 μm are 0.7 and 0.71, respectively, and the DoCP is higher than 0.5 in the wide wavelength ranges of 3.5–4.83 μm. According to the local Kirchhoff's law, the spin-dependent thermal emission originates from the strong inherent local chirality of the ASRR through the near-field distribution and the local emissivity density. Then, the effects of geometric parameters of meta-unit on the DoCP characteristics are studied in detail, which indicates that the geometric perturbation segments quantified by S result in the CPE regulation. Specifically, the DoCP decreases from 0.71 to 0 as the perturbation factor S increases from 0 to 5. Finally, we numerically demonstrate that the designed chiral plasmonic metasurface has potential applications in infrared circularly polarized light detection.

中红外(MIR)圆偏振发射(CPE)被广泛应用于分子传感、信息加密、目标探测和光通信领域。然而,如何产生和调节具有较大圆偏振(DoCP)度的宽带中红外热发射仍然是一个重大挑战。在这里,我们设计了一种由不对称辐环谐振器(ASRR)组成的对称破缺手性质子元表面,可在 3.4-5 μm 的中红外区域发射高纯度的宽带 CPE。模拟结果表明,波长为 3.74 μm 和 4.27 μm 时的 DoCP 分别为 0.7 和 0.71,而在 3.5-4.83 μm 的宽波长范围内,DoCP 均大于 0.5。根据局域基尔霍夫定律,自旋相关热发射源于 ASRR 通过近场分布和局域发射率密度产生的强固有局域手性。然后,详细研究了元单元几何参数对 DoCP 特性的影响,结果表明,以 S 量化的几何扰动段导致了 CPE 调节。具体来说,当扰动因子 S 从 0 增加到 5 时,DoCP 从 0.71 下降到 0。最后,我们从数值上证明了所设计的手性质子元表面在红外圆偏振光检测中的潜在应用。
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引用次数: 0
Dielectric properties of hafnium oxide film prepared by HiPIMS at different O2/Ar ratios and their influences on TFT performance 不同 O2/Ar 比率下 HiPIMS 制备的氧化铪薄膜的介电性能及其对 TFT 性能的影响
IF 8 3区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-04-16 DOI: 10.1016/j.jsamd.2024.100722
Ming-Jie Zhao , Yao-Tian Wang , Jia-Hao Yan , Hai-Cheng Li , Hua Xu , Dong-Sing Wuu , Wan-Yu Wu , Feng-Min Lai , Shui-Yang Lien , Wen-Zhang Zhu

High-k hafnium oxide (HfO2) film was prepared by high power impulse magnetron sputtering (HiPIMS). The influences of oxygen supply on the plasma state, film properties and TFT performance were investigated. The films are near-stoichiometric and preferentially (−1 1 1)-orientated. When the oxygen supply increased from 1% to 3%, the excitation/ionization rate of the plasma species increased, leading to higher crystallinity, higher density, and lower oxygen vacancy defect concentration of the film, therefore improving the dielectric properties of the film. When the oxygen supply further increased to 5%, the excitation/ionization rate decreased, thereby leading to lower crystallinity, lower density, and higher oxygen vacancy defect concentration of the film, therefore deteriorating the dielectric properties of the film. The film deposited at 3% oxygen supply exhibited the best dielectric properties with the highest k value of 24 and the highest breakdown-electric field (4.7 MV/cm), which should be attributed to the high crystallinity, high density and low oxygen vacancy defect concentration of the film. Finally, transparent thin film transistors (TFTs) with ITO gate electrode, HfO2 gate dielectric layer and indium-gallium-zinc oxide channel were fabricated on flexible colorless polyimide substrate at full room temperature by all HiPIMS process. The fixed positive charges and k value of HfO2 film have significant effects on the TFT performance. The best TFT exhibited good electrical performance, featuring a remarkably low subthreshold swing of 0.13 V/decade. It also exhibited fair stability against bending and gate bias stress.

通过高功率脉冲磁控溅射(HiPIMS)制备了高k氧化铪(HfO2)薄膜。研究了氧气供应对等离子体状态、薄膜特性和 TFT 性能的影响。薄膜接近于化学计量,并优先呈(-1 1 1)取向。当供氧量从 1% 增加到 3% 时,等离子体物种的激发/电离率增加,导致薄膜的结晶度提高、密度增加、氧空位缺陷浓度降低,从而改善了薄膜的介电性能。当供氧量进一步增加到 5%时,激发/电离率降低,从而导致薄膜的结晶度降低、密度降低和氧空位缺陷浓度升高,因此薄膜的介电性能变差。在 3% 供氧条件下沉积的薄膜具有最好的介电性能,k 值最高,为 24,击穿电场最高(4.7 MV/cm),这应归功于薄膜的高结晶度、高密度和低氧空位缺陷浓度。最后,采用全 HiPIMS 工艺在全室温柔性无色聚酰亚胺衬底上制作了具有 ITO 栅极、HfO2 栅极介电层和铟镓锌氧化物沟道的透明薄膜晶体管(TFT)。HfO2 薄膜的固定正电荷和 k 值对 TFT 性能有显著影响。最好的 TFT 具有良好的电气性能,阈下摆幅低至 0.13 V/decade。此外,它对弯曲和栅极偏压应力也表现出相当的稳定性。
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引用次数: 0
Customized and high-performing acoustic levitators for contact-free experiments 用于非接触实验的定制高性能声学悬浮器
IF 8 3区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-04-16 DOI: 10.1016/j.jsamd.2024.100720
Smaragda-Maria Argyri , Carl Andersson , Nicolas Paillet , Lars Evenäs , Jens Ahrens , Asier Marzo , Víctor Contreras , Romain Bordes

Acoustic levitators are becoming increasingly common research instrumentation for contact-free, lab-in-a-droplet studies. Recently, levitators that employ multiple, small, ultrasonic transducers have gained popularity, given their low price, temperature and spatial stability, low voltage, and accessibility. Yet, the current state-of-the-art device, TinyLev, presents limitations for certain applications in terms of stability, strength, and compactness. Herein, we developed three new levitators and evaluated the effect of the construction parameters (e.g., distance of opposing arrays, number and arrangement of transducers, etc.) on their performance. The best performing levitator from this work had half the number of transducers, compared to TinyLev, though presented 1.7 and 3.5 times higher levitation capacity along the horizontal and vertical configurations, respectively, and 4.7 and 2.0 times higher horizontal and vertical stability of a levitated object, respectively. Additionally, we present a direct means to evaluate the acoustic radiation net force acting on a deformable object for uniaxial levitators, without the use of a microphone or a schlieren deflectometer for this type of levitators. The theoretical and experimental observations provide insights for adapting the acoustic levitator design for specific applications. Finally, we developed an open-source software which allows the evaluation of the acoustic pressure field generated by customized designs and provides the necessary files for 3D printing the scaffold of the levitator. This study aims to increase accessibility and promote further developments in contact-free experiments.

声学悬浮仪正日益成为非接触式、实验室液滴研究的常用研究仪器。最近,采用多个小型超声波传感器的悬浮器因其低廉的价格、温度和空间稳定性、低电压和易接近性而大受欢迎。然而,目前最先进的设备 TinyLev 在稳定性、强度和紧凑性方面对某些应用存在限制。在此,我们开发了三种新型悬浮器,并评估了结构参数(如对立阵列的距离、传感器的数量和排列等)对其性能的影响。与 TinyLev 相比,这项工作中性能最好的悬浮器的传感器数量仅为 TinyLev 的一半,但其水平和垂直配置的悬浮能力分别提高了 1.7 倍和 3.5 倍,悬浮物体的水平和垂直稳定性分别提高了 4.7 倍和 2.0 倍。此外,我们还提出了一种直接评估单轴悬浮器作用在可变形物体上的声辐射净力的方法,对于这类悬浮器,无需使用麦克风或施利尔偏转计。理论和实验观察结果为针对特定应用调整声学悬浮器设计提供了启示。最后,我们开发了一个开源软件,可以评估定制设计所产生的声压场,并提供三维打印悬浮器支架所需的文件。这项研究旨在提高非接触式实验的可及性并促进其进一步发展。
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引用次数: 0
Novel micro/nanomotors for tumor diagnosis and therapy: Motion mechanisms, advantages and applications 用于肿瘤诊断和治疗的新型微型/纳米马达:运动机制、优势和应用
IF 8 3区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-04-16 DOI: 10.1016/j.jsamd.2024.100718
Yangbo Zhu , Haiqin Huang , Qingwei Zhao , Jiayi Qin

The lack of effective diagnostic and therapeutic techniques is a crucial cause of the high clinical mortality for malignancy. Notably, self-propelled micro/nanomotors are expected to address the drawbacks of conventional nanoparticles in tumor diagnosis and therapy. The special locomotion property ensures the high efficiency of micro/nanomotors in term of rapid distribution, deep penetration, and targeted delivery. Hence, in this review, the motion mechanism and the controllability of speed and direction of the micro/nanomotors were described, as well as the advantages regarding the enhancement of biological barrier crossing (overcoming blood flow obstacles, tumor microenvironment barriers), targeting delivery and deep penetration in the tumor. The most recent advances in micro/nanomotor contributions were comprehensively summarized to various medical imaging technologies, biosensing techniques, and therapeutic approaches, especially for the combination therapy and integration of diagnosis and treatment based on multifunctional micro/nanomotors. Furthermore, challenges for developing practical micro/nanomotors were discussed along with future directions from the clinicians' perspective, which is promised to speed up the clinical translation process and contribute to efficient tumor diagnosis and therapy.

缺乏有效的诊断和治疗技术是恶性肿瘤临床死亡率高的重要原因。值得注意的是,自走式微型/纳米马达有望解决传统纳米粒子在肿瘤诊断和治疗方面的弊端。微/纳米马达的特殊运动特性确保了其在快速分布、深度渗透和靶向递送方面的高效性。因此,本综述介绍了微/纳米马达的运动机理、速度和方向的可控性,以及在增强生物屏障穿越(克服血流障碍、肿瘤微环境障碍)、靶向递送和肿瘤深层穿透方面的优势。会议全面总结了微型/纳米马达在各种医学成像技术、生物传感技术和治疗方法方面的最新进展,特别是基于多功能微型/纳米马达的联合治疗和诊断与治疗一体化。此外,还从临床医生的角度讨论了开发实用微型/纳米马达所面临的挑战以及未来的发展方向,这有望加快临床转化进程,为高效的肿瘤诊断和治疗做出贡献。
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引用次数: 0
Sustainable and cost-effective edge oxidized graphite/PEDOT:PSS nanocomposites with improved electrical conductivity 可持续且经济高效的边缘氧化石墨/PEDOT:PSS 纳米复合材料,具有更好的导电性能
IF 8 3区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-04-16 DOI: 10.1016/j.jsamd.2024.100723
Giuseppe Greco , Antonella Giuri , Salvatore Gambino , Sonia Carallo , Silvia Colella , Chiara Ingrosso , Aida Kiani , Maria Rosaria Acocella , Aurora Rizzo , Carola Esposito Corcione

Poly(3,4-ethylenedioxythiophene): polystyrene sulfonate (PEDOT:PSS) is a soft and conjugated polymer whose conductive properties can be properly tuned through doping with various additives or solvents, preserving its excellent processability. In this work PEDOT:PSS was combined with a cost-effective graphite derivative named Edge Oxidized Graphite (EOG) for developing a nanocomposite with improved electrical conductivity, with respect to the pristine PEDOT:PSS, through an easy and environmentally friendly doping process. Firstly, the EOG powders, produced by a green oxidation process of graphite, were deeply characterized through Fourier transform infrared (FT-IR), Thermogravimetric (TGA), and Wide-angle X-ray scattering (WAXD) analysis, showing that this nanofiller has oxygenated functional groups on the sheet edges. The quality and the stability of the EOG dispersions within PEDOT:PSS were investigated at different carbon-filler concentrations, up to high loading of 25 %wt/V of EOG through rheological analyses, demonstrating pseudo-plastic behavior and excellent long-term stability of the inks due to the absence of inhomogeneities and aggregates over time; in fact, the same inks were tested under the same rheological conditions after 21 days, showing the same viscosity trend for all EOG concentrations (%wt/V). Transmission electron microscopy (TEM) and (Scanning Electron microscopy) SEM investigation of spin-coated samples onto glass substrates were performed to morphologically evaluate the nanocomposites and estimate the average size of the sheets, particularly the mean length of 1.2 μm and an approximated thickness of 26 nm of the EOG sheets dispersed into the polymer matrix (PEDOT:PSS) was determined, while WAXD analysis allowed to identify the average layer number of the EOG sheets, obtaining thus, a direct measurement of the EOG sheets aspect ratio equal to 45. Finally, sheet resistance tests showed that the increasing concentration of EOG leads to a significant improvement in the electrical conductivity of the nanocomposites, from 1.1 S/cm for pristine PEDOT:PSS to 21.9 S/cm for nanocomposites with the highest EOG content (25 %wt/V). This work demonstrates the successful development of nanocomposite based on PEDOT:PSS doped with carbon-based filler synthesized through a green and cost-effective process, promoting their use in the production of bio/electrochemical sensors or optoelectronic devices.

聚(3,4-亚乙二氧基噻吩):聚苯乙烯磺酸盐(PEDOT:PSS)是一种柔软的共轭聚合物,其导电性能可通过掺杂各种添加剂或溶剂进行适当调整,同时保持其优异的加工性能。在这项研究中,PEDOT:PSS 与一种名为 "边缘氧化石墨"(EOG)的高性价比石墨衍生物相结合,通过简单、环保的掺杂工艺,开发出一种导电性能比原始 PEDOT:PSS 更强的纳米复合材料。首先,通过傅里叶变换红外(FT-IR)、热重(TGA)和广角 X 射线散射(WAXD)分析对石墨绿色氧化工艺制得的 EOG 粉末进行了深入表征,结果表明这种纳米填料的片状边缘具有含氧官能团。通过流变学分析,研究了不同碳填料浓度下 PEDOT:PSS 中 EOG 分散体的质量和稳定性,最高达到 25%wt/V 的 EOG 高负载量,结果表明油墨具有假塑性行为和出色的长期稳定性,因为长期使用不会出现不均匀和聚集现象;事实上,21 天后在相同的流变学条件下对相同的油墨进行了测试,结果表明所有 EOG 浓度(%wt/V)下的粘度趋势相同。对玻璃基底上的旋涂样品进行了透射电子显微镜(TEM)和扫描电子显微镜(SEM)检查,以对纳米复合材料进行形态学评估,并估算片材的平均尺寸,特别是确定了分散在聚合物基质(PEDOT:PSS)中的 EOG 片材的平均长度为 1.2 μm,近似厚度为 26 nm,而 WAXD 分析可以确定 EOG 片材的平均层数,从而直接测量出 EOG 片材的长宽比为 45。最后,薄片电阻测试表明,随着 EOG 浓度的增加,纳米复合材料的导电性能显著提高,从原始 PEDOT:PSS 的 1.1 S/cm 提高到 EOG 含量最高(25 %wt/V)的纳米复合材料的 21.9 S/cm。这项工作表明,通过绿色、经济高效的工艺,成功开发出了基于掺杂碳基填料的 PEDOT:PSS 纳米复合材料,促进了其在生物/电化学传感器或光电设备生产中的应用。
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引用次数: 0
Effect of graphite, graphene oxide, and multi-walled carbon nanotubes on the physicochemical characteristics and biocompatibility of chitosan/hyaluronic acid/hydroxyapatite scaffolds for tissue engineering applications 石墨、氧化石墨烯和多壁碳纳米管对组织工程应用中壳聚糖/透明质酸/羟基磷灰石支架的理化特性和生物相容性的影响
IF 8 3区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-04-15 DOI: 10.1016/j.jsamd.2024.100719
Siti Fauziyah Rahman , Muhammad Maulana Ghiffary , Joshua Yoshihiko Tampubolon , Elly Septia Yulianti , Muhammad Hanif Nadhif , Puspita Anggraini Katili , Siti Hanafiah , Azizah Intan Pangesty , Muhammad Artha Jabatsudewa Maras

Bone tissue engineering (BTE) is a promising alternative approach to the repair of damaged bone tissue. This study aims to fabricate and characterize scaffolds composed of chitosan (CS), hyaluronic acid (HA), hydroxyapatite (HAp), and a combination of graphite (Gr), graphene oxide (GO), and multi-walled carbon nanotubes (MWCNT) for BTE applications. The Gr and MWCNT were functionalized by acid oxidation, while the GO was synthesized using the improved Hummers' method. The scaffolds were prepared by lyophilization, and the physical, chemical, and biological properties were evaluated. Scanning electron microscopy (SEM), energy-dispersive x-ray spectroscopy (EDS), Fourier transform infrared (FTIR) spectroscopy, mechanical testing, water contact angle, degradation, and biocompatibility assays were used to characterize the scaffolds. The degradation rate was determined using the liquid displacement method. Pores of different sizes were present on the surface of and throughout the scaffold. According to the FTIR results, the scaffolds contained functional groups that promote cell differentiation and proliferation. These scaffolds have compressive strength, Young's modulus, and toughness similar to cancellous bone, with reasonable porosity and controllable degradation rates. Biocompatibility testing confirmed that the scaffolds support cell proliferation and differentiation.

骨组织工程(BTE)是修复受损骨组织的一种前景广阔的替代方法。本研究旨在制备和表征由壳聚糖(CS)、透明质酸(HA)、羟基磷灰石(HAp)以及石墨(Gr)、氧化石墨烯(GO)和多壁碳纳米管(MWCNT)组合而成的支架,以用于 BTE 应用。石墨(Gr)和多壁碳纳米管(MWCNT)是通过酸氧化法进行功能化的,而氧化石墨烯(GO)则是采用改进的 Hummers 方法合成的。通过冻干法制备了支架,并对其物理、化学和生物特性进行了评估。使用扫描电子显微镜(SEM)、能量色散 X 射线光谱(EDS)、傅立叶变换红外光谱(FTIR)、机械测试、水接触角、降解和生物相容性检测来表征支架。降解率采用液体置换法测定。支架表面和整个支架都存在不同大小的孔隙。傅立叶变换红外光谱结果表明,支架含有促进细胞分化和增殖的官能团。这些支架具有与松质骨相似的抗压强度、杨氏模量和韧性,孔隙率合理,降解速率可控。生物相容性测试证实,这些支架支持细胞增殖和分化。
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引用次数: 0
Removal of tetracycline and ciprofloxacin from aqueous solutions using magnetic copper ferrite nanoparticles 利用磁性铜铁氧体纳米粒子去除水溶液中的四环素和环丙沙星
IF 8 3区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-04-14 DOI: 10.1016/j.jsamd.2024.100717
Minge Yang , Jiapan He , Junyi He , Junji Cao

This study investigated the removal of tetracycline and ciprofloxacin antibiotics from an aqueous solution in a batch system using magnetic copper ferrite (CuFe2O4) nanoparticles as adsorbents. Next, the effects of important parameters such as concentration, adsorbent dosage, ultrasonication time, and pH were examined on the efficiency of the tetracycline and ciprofloxacin removal process. The optimum conditions of the parameters were determined through the Box-Behnken design (BBD) based on the design of the experiment (DOE). The second-order regression coefficients were estimated following the statistical analysis of the results by analysis of variance (ANOVA). The optimal points were determined accurately by combining the results and drawing a second-order multivariate equation. The optimum conditions were obtained at a concentration of 30 mg L−1, a dosage of 0.021 g, a pH of 7, and an ultrasonication time of 11 min. Under the optimum conditions, the maximum removal efficiency was 96.89% and 99.03% for tetracycline and ciprofloxacin, respectively. The performance of CuFe2O4 adsorbent in five consecutive experiments did not show much decline, indicating the reusability and stability of the adsorbent. The study results showed that CuFe2O4 adsorbent could remove tetracycline and ciprofloxacin from real water samples by more than 98%.

本研究以磁性铜铁氧体(CuFe2O4)纳米颗粒为吸附剂,研究了在批处理系统中去除水溶液中的四环素和环丙沙星抗生素。接下来,研究了浓度、吸附剂用量、超声时间和 pH 值等重要参数对四环素和环丙沙星去除效率的影响。在实验设计(DOE)的基础上,通过方框-贝肯设计(BBD)确定了参数的最佳条件。通过方差分析(ANOVA)对结果进行统计分析后,估算出二阶回归系数。通过综合结果并绘制二阶多元方程,准确确定了最佳点。在浓度为 30 mg L-1、用量为 0.021 g、pH 值为 7、超声时间为 11 分钟的条件下,获得了最佳条件。在最佳条件下,四环素和环丙沙星的最大去除率分别为 96.89% 和 99.03%。在连续五次实验中,CuFe2O4 吸附剂的性能都没有明显下降,这表明该吸附剂具有可重复使用性和稳定性。研究结果表明,CuFe2O4 吸附剂对实际水样中四环素和环丙沙星的去除率超过 98%。
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引用次数: 0
Expanding the applications of the wear-resistant titanium aluminum nitride thin-film to include temperature sensing 将耐磨损氮化钛铝薄膜的应用扩展到温度传感领域
IF 8 3区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-04-09 DOI: 10.1016/j.jsamd.2024.100716
Bruno Martins , Carlos Patacas , Albano Cavaleiro , Pedro Faia , Fátima Zorro , Enrique Carbo-Argibay , Paulo J. Ferreira , Filipe Fernandes

This study investigates an approach to temperature sensing by integrating Titanium Aluminum Nitride (TiAlN), originally engineered for wear and corrosion applications, as a temperature sensor within a multilayered thin film system. A nitride multilayer system was developed by physical vapor deposition (PVD) using a single four-target magnetron sputtering chamber; intermediate vacuum interruption steps were employed for masking procedures. The multilayer architecture design aimed to provide the sensor layer with mechanical protection and electrical shielding. Structural and electrical characterization of the TiAlN single layer revealed semiconductor behavior and stable electrical resistance up to 750 °C, with minimal signal stabilization requirements. Despite the higher Al content, the TiAlN temperature sensor exhibited a cubic crystal structure characterized by diffuse nanolayers, resulting from a two-fold rotational deposition and target configuration. A detailed examination of the multilayer system cross-section containing the TiAlN sensor was conducted using scanning transmission electron microscopy (STEM). The analysis revealed its columnar morphology with the presence of typical PVD growth defects, including voids and droplets. While the presence of these defects may impact the electrical characteristics of the sensor, the selected experimental conditions effectively maintained the structural integrity of the multilayer system despite the vacuum interruptions caused by masking procedures. Validation experiments confirmed the functionality of the multilayer system for temperature measurements up to 400 °C. The signal acquisition system addressed room temperature resistance variations and low sensitivity (thermistor coefficient ∼100 K), resulting in a measured error of approximately 6%. This study demonstrates promising results of TiAlN as a temperature sensor within a multilayered system, expanding its range of potential applications.

本研究探讨了一种温度传感方法,即在多层薄膜系统中集成氮化钛铝(TiAlN)作为温度传感器,氮化钛铝最初是为磨损和腐蚀应用而设计的。氮化多层系统是通过物理气相沉积(PVD)技术,使用单个四靶磁控溅射室开发的;中间真空中断步骤用于掩膜程序。多层结构设计旨在为传感器层提供机械保护和电气屏蔽。TiAlN 单层的结构和电气特性分析表明,该层具有半导体特性和稳定的电阻,温度可达 750 °C,对信号稳定的要求极低。尽管铝含量较高,TiAlN 温度传感器仍表现出立方晶体结构,其特点是弥散纳米层,这是两倍旋转沉积和目标配置的结果。使用扫描透射电子显微镜(STEM)对包含 TiAlN 传感器的多层系统横截面进行了详细检查。分析表明,该系统呈柱状形态,存在典型的 PVD 生长缺陷,包括空隙和液滴。虽然这些缺陷的存在可能会影响传感器的电气特性,但所选的实验条件有效地保持了多层系统的结构完整性,尽管遮蔽程序会导致真空中断。验证实验证实了多层系统在高达 400 °C 的温度测量中的功能。信号采集系统解决了室温电阻变化和低灵敏度问题(热敏电阻系数 ∼ 100 K),测量误差约为 6%。这项研究表明,TiAlN 作为多层系统内的温度传感器具有良好的应用前景,从而扩大了其潜在的应用范围。
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引用次数: 0
Bio-inspired deposition of gold nanoparticles onto the surface of kaolin for in vitro management of human ovarian cancer and modulation of the inflammatory response in adenomyosis-induced mice in vivo via the MAPK signaling pathway 在高岭土表面支持金纳米粒子的生物启发,用于体外治疗人类卵巢癌,并通过 MAPK 信号转导途径调节体内小鼠子宫腺肌症的炎症作用
IF 8 3区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-04-03 DOI: 10.1016/j.jsamd.2024.100714
Dengcai Zhang , Lijuan Wang , Lu Tian , Wenshi Chen , Attalla F. El-kott , Sally Negm , Waleed Eltantawy , Mohammed O. Alshaharni

A mild and eco-friendly protocol has been developed for the preparation of kaolin-decorated Au nanoparticles mediated by Ephedra root extract as a green reducing and stabilizing agents without any toxic substrates. Structural features of the prepared Au NPs/Kaolin were assessed through FE-SEM, TEM, and XRD techniques. TEM images show the good deposition of Au NPs over the surface of extract-modified kaolin without aggregation. Towards the medicinal application, its antioxidant efficacy was assessed by the DPPH method, and the corresponding IC50 value was obtained as 104 μg/mL. Cytotoxicity of the nanoformulated bio-composite was ascertained through MTT analysis against human ovarian carcinoma cells, i.e., PA-1 and SK-OV-3. The IC50 in those studies was 250 and 119 μg/mL against PA-1and SK-OV-3 cells, respectively. In the in vivo design, tamoxifen was used to induce the experimental adenomyosis model in mice. After treatment, the thymus, spleen, uterine, and body weights of all animals were measured. Then, inflammatory factor expression and myometrial infiltration were determined by qRT-PCR, ELISA, and histology examination in the uterus. Western blotting, qRT-PCR, and immune histochemical (IHC) staining were applied to analyze the MAPK/ERK signaling pathway protein expression. Au NPs/Kaolin bio-nanocomposite ameliorated the adenomyosis symptoms by raising the thymus and spleen index and decreasing the myometrial infiltration. The raised levels of TNF-α, IL-6, and IL-1β in adenomyosis model mice uterus and serum were also reduced after Au NPs/Kaolin bio-nanocomposite treatment. The adenomyosis amelioration of Au NPs/Kaolin bio-nanocomposite was gained by preventing the MAPK/ERK signaling pathway, including decreasing the expressions of protein and mRNA of p-p38/p38, p-JNK/JNK, and p-ERK/ERK.

以麻黄根提取物作为绿色还原剂和稳定剂,在不使用任何有毒基质的情况下,开发了一种温和、环保的高岭土装饰金纳米粒子制备方法。通过 FE-SEM、TEM 和 XRD 技术评估了制备的金纳米粒子/高岭土的结构特征。TEM 图像显示,Au NPs 在提取物改性的高岭土表面沉积良好,没有聚集。在药物应用方面,通过 DPPH 法评估了其抗氧化功效,得出相应的 IC50 值为 104 μg/mL。通过 MTT 分析确定了纳米生物复合材料对人类卵巢癌细胞(即 PA-1 和 SK-OV-3)的细胞毒性。在这些研究中,对 PA-1 和 SK-OV-3 细胞的 IC50 分别为 250 和 119 μg/mL。在体内设计中,使用他莫昔芬诱导小鼠实验性腺肌病模型。治疗后,测量所有动物的胸腺、脾脏、子宫和体重。然后,通过 qRT-PCR、ELISA 和子宫组织学检查确定炎症因子的表达和子宫肌层浸润情况。应用 Western 印迹、qRT-PCR 和免疫组织化学(IHC)染色来分析 MAPK/ERK 信号通路蛋白的表达。Au NPs/Kaolin生物纳米复合材料通过提高胸腺和脾脏指数以及减少子宫肌层浸润改善了子宫腺肌症的症状。经 Au NPs/Kaolin 生物纳米复合材料处理后,子宫腺肌病模型小鼠子宫和血清中升高的 TNF-α、IL-6 和 IL-1β 水平也有所降低。Au NPs/Kaolin 生物纳米复合材料对子宫腺肌症的改善作用是通过阻止 MAPK/ERK 信号通路实现的,包括降低 p-p38/p38、p-JNK/JNK 和 p-ERK/ERK 蛋白和 mRNA 的表达。
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引用次数: 0
Electrical circuit modeling for the relaxor response of bismuth magnesium tantalate pyrochlore 钽酸铋镁热长石弛豫器响应的电路建模
IF 8 3区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-04-02 DOI: 10.1016/j.jsamd.2024.100715
P.Y. Tan , K.B. Tan , C.C. Khaw , H.C. Ananda Murthy , R. Balachandran , S.K. Chen , O.J. Lee , K.Y. Chan , M. Lu

The electrical properties of bismuth magnesium tantalate pyrochlore, Bi3.30Mg1.88Ta2.82O13.88 (BMT) were investigated by both inductor-capacitor-resistor (LCR) and impedance spectroscopy techniques covering a broad temperature range of 10–1073 K and a frequency range of 5 Hz - 1 MHz. At below ∼180 K, BMT pyrochlore exhibited interesting relaxor behaviour that showed high dispersion characteristics in its frequency-temperature dependent dielectric constants, ε′ and dielectric losses, tan δ, respectively. The maximum ε′max of ∼77 was obtained at the temperature maximum, Tm of 154 K. The frequency-independent ε′ data above 154 K at a fixed frequency of 1 MHz can be well fitted with the Curie-Weiss law and the relaxation features of Bi3.30Mg1.88Ta2.82O13.88 obeyed the Vogel-Fulcher equation. The dielectric properties of Bi3.30Mg1.88Ta2.82O13.88 relaxor in the low temperature range of 20–320 K could be satisfactorily modeled with different equivalent circuits. In this perspective, a master circuit consisting of a parallel R-C-CPE element in series with a capacitor was required to accurately fit the low temperature data.

通过电感-电容-电阻(LCR)和阻抗光谱技术研究了钽酸铋(Bi3.30Mg1.88Ta2.8O13.88,BMT)的电学特性,其温度范围为 10-1073 K,频率范围为 5 Hz-1 MHz。在低于 180 K 时,BMT 烧绿石表现出有趣的弛豫行为,其频率-温度相关介电常数 ε′ 和介电损耗 tan δ 分别表现出高分散特性。在固定频率为 1 MHz 时,154 K 以上与频率无关的ε′数据可以很好地与居里-魏斯定律拟合,Bi3.30Mg1.88Ta2.8O13.88 的弛豫特征服从 Vogel-Fulcher 方程。在 20-320 K 的低温范围内,Bi3.30Mg1.88Ta2.82O13.88 弛豫器的介电性能可以通过不同的等效电路得到令人满意的模型。从这个角度来看,需要一个由并联 R-C-CPE 元件与电容器串联组成的主电路来准确拟合低温数据。
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引用次数: 0
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Journal of Science: Advanced Materials and Devices
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