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Structural and temperature dependent dielectric behaviour of BxFe(3−x)O4 nanoferrite particles BxFe(3-x)O4 纳米铁氧体颗粒的结构和随温度变化的介电性能
IF 1.3 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-03-31 DOI: 10.1049/mna2.12194
Paramesh Donta

The auto-combustion technique was employed to synthesize nano particles of BxFe(3−x)O4 (x = 0.0, 0.7, 1.18, 1.36 and 1.54). The resulting structural and dielectric properties of the boron doped Fe3O4 were evaluated. XRD analysis confirmed the presence of a single spinel structure with crystallite dimensions ranging from 21.18 to 26.43 nm and lattice parameters of 8.211 to 8.487 Ǻ. The morphological images revealed homogenous and spherical grain sizes, while EDX confirmed the presence of constituent elements used. The X-ray density increased whereas the bulk density and the porosity decreased with boron substitution. The study of dielectric properties and AC conductivity (σAC) was demonstrated and the AC conductivity decreased with increasing boron concentration, indicating a hopping mechanism. Moreover, noticeable variations in dielectric loss, AC conductivity, and dielectric permittivity with temperature and frequency were observed. These observations were attributed to the Maxwell–Wagner interfacial polarization and the hopping of charges between Fe3+ and Fe2+ ions.

采用自燃技术合成了 BxFe(3-x)O4 纳米颗粒(x = 0.0、0.7、1.18、1.36 和 1.54)。对掺硼 Fe3O4 的结构和介电性质进行了评估。XRD 分析证实了单一尖晶石结构的存在,晶粒尺寸为 21.18 至 26.43 nm,晶格参数为 8.211 至 8.487 Ǻ。形态图像显示出均匀的球形晶粒尺寸,而电离辐射X则证实了所使用的组成元素的存在。X 射线密度随着硼的替代而增加,而体积密度和孔隙率则随着硼的替代而降低。对介电性质和交流电导率(σAC)的研究表明,交流电导率随着硼浓度的增加而降低,这表明存在跳变机制。此外,还观察到介电损耗、交流电导率和介电常数随温度和频率的显著变化。这些观察结果归因于 Maxwell-Wagner 界面极化以及 Fe3+ 和 Fe2+ 离子之间的电荷跳跃。
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引用次数: 0
Optimizing nanostructure deposition process for optical applications 优化光学应用中的纳米结构沉积工艺
IF 1.3 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-03-15 DOI: 10.1049/mna2.12186
Joshua Neilson, Veronica Granata, Ofelia Durante, Christopher Ausbeck, Timothy F. Bennett, Fabrizio Bobba, Marco Cannavacciuolo, Giovanni Carapella, Francesco Chiadini, Riccardo DeSalvo, Roberta De Simone, Cinzia Di Giorgio, Rosalba Fittipaldi, Vincenzo Fiumara, Brecken Larsen, Tugdual LeBohec, Seth Linker, Alberto Micco, Marina Mondin, Bhavna Nayak, Antonio Vecchione, Innocenzo M. Pinto, Vincenzo Pierro

In many physics and engineering applications requiring exceptional precision, the presence of highly reflective coatings with low thermal noise is of utmost significance. These applications include high-resolution spectroscopy, optical atomic clocks, and investigations into fundamental physics such as gravitational wave detection. Enhancing sensitivity in these experiments relies on effectively reducing the thermal noise originating from the coatings. While ion beam sputtering (IBS) is typically employed for fabricating such coatings, electron beam evaporation can also be utilized and offers certain advantages over IBS, such as versatility and speed. However, a significant challenge in the fabrication process has been the limitations of the quartz crystal monitor used to measure the thickness of the deposited layers. This paper showcases how, through hardware and software upgrades, it becomes achievable to create high-density coatings with layers as thin as a few angstroms by using electron beam evaporation (OAC75F coater) with a deposition rate of 1 Å/s and ion-assisted source with a gas mixture of oxygen and argon, using a pressure of about 4 × 10−4 mbar. Furthermore, these upgrades enable the attainment of high levels of precision and uniformity in the thickness of the coatings.

在许多要求超高精度的物理和工程应用中,具有低热噪的高反射涂层至关重要。这些应用包括高分辨率光谱学、光学原子钟以及引力波探测等基础物理学研究。提高这些实验的灵敏度有赖于有效降低涂层产生的热噪声。虽然离子束溅射(IBS)通常用于制造此类涂层,但电子束蒸发也可用于制造此类涂层,而且与离子束溅射相比,电子束蒸发具有某些优势,如多功能性和快速性。然而,制造过程中的一个重大挑战是用于测量沉积层厚度的石英晶体监测器的局限性。本文展示了如何通过硬件和软件升级,使用电子束蒸发(OAC75F 涂层机)以 1 Å/s 的沉积速率和使用氧气与氩气混合气体的离子辅助源(压力约为 4 × 10-4 mbar),制造出层厚仅为几埃的高密度涂层。此外,这些升级还使涂层厚度的精度和均匀性达到了很高的水平。
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引用次数: 0
A transformerless Z-source photovoltaic grid-connected inverter with coupled inductor coil 带耦合感应线圈的无变压器 Z 源光伏并网逆变器
IF 1.3 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-02-29 DOI: 10.1049/mna2.12193
Yunzhong Dai, Huaiyu Zhang

The quasi-Z-source H-bridge grid-connected inverter (QHGCI) is well known for its advantages of the void of the shoot-through problem and the high DC-voltage utilization. But the existence of the common-mode leakage current in the power frequency cycle, lower power density, and higher thermal stress make it hard applicable to the grid-penetrating application. Thus with the purpose to conquer the problem relating to the QHGCI, an innovative transformerless Z-source photovoltaic grid-connected inverter with a coupled inductor coil (TZPGCI-CIC) is proposed. The circuitry topology and an unipolar sine pulse width modulation strategy are first introduced in short. Thereafter, the common-mode voltage in the whole working process is derived and evaluated through the detailed operating mode analysis, in which a constant value of it has been theoretically revealed. Lastly, a prototype platform of TZPGCI-CIC is set up and its good performance on leakage current suppression, and lower thermal stress are validated with the experimental results.

准 Z 源 H 桥并网逆变器(QHGCI)因其不存在击穿问题和直流电压利用率高的优点而广为人知。但是,由于在电源频率周期内存在共模漏电流、功率密度较低以及热应力较大等问题,它很难适用于穿透电网的应用。因此,为了解决与 QHGCI 相关的问题,我们提出了一种创新型无变压器 Z 源光伏并网逆变器(TZPGCI-CIC)。首先简要介绍了电路拓扑结构和单极性正弦脉宽调制策略。随后,通过详细的工作模式分析,得出并评估了整个工作过程中的共模电压,并从理论上揭示了其恒定值。最后,建立了 TZPGCI-CIC 原型平台,并通过实验结果验证了其在抑制漏电流和降低热应力方面的良好性能。
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引用次数: 0
Study on high voltage (5 V) spinel lithium manganese oxide LiNi0.5Mn1.5O4 by doping niobium 通过掺杂铌研究高压(5 V)尖晶石锂锰氧化物 LiNi0.5Mn1.5O4
IF 1.3 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-02-28 DOI: 10.1049/mna2.12192
Wei Li, Xiaotao Wang, Dan Wu, Dehao Kong, Han Wu, Lai Mang, Bo Liao, O. Tegus, Yongjun Cao, Oimod Haschuluu

The effect of niobium ions with high-valence doping on high-voltage LiNi0.5Mn1.5O4 (LNMO) materials was investigated. LiNi0.5Mn1.5−xNbxO4 was prepared by doping high-valent niobium ions into LiNi0.5Mn1.5O4 material using the organic assisted combustion method. The experimental samples were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), electrochemical impedance (EI), and cyclic voltammetry (CV) analysis. The experimental results show that -doping with high-valence niobium ions changes the orientation of the crystal plane growth of spinel particles, and the morphology of these particles changes from the octahedral shape before doping to the spherical shape after doping. With the increase in doping amount, the crystal structure changes gradually, resulting in the Li0.96Nb1.01O3 impurity phase. The doping of high valence-niobium ions increases the content of Mn3+ in the material, resulting in the appearance of a 4 V discharge platform and the formation of a 4.7 and 4 V discharge platforms. The doping of Nb can improve the cycling stability of LiNi0.5Mn1.5O4 material, but the specific capacity of the material is reduced.

研究了高价掺杂铌离子对高压 LiNi0.5Mn1.5O4 (LNMO) 材料的影响。采用有机辅助燃烧法在 LiNi0.5Mn1.5O4 材料中掺入高价铌离子制备了 LiNi0.5Mn1.5-xNbxO4。实验样品通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X 射线衍射(XRD)、X 射线光电子能谱(XPS)、电化学阻抗(EI)和循环伏安法(CV)分析进行了表征。实验结果表明,高价铌离子的掺杂改变了尖晶石颗粒晶面生长的取向,这些颗粒的形貌也从掺杂前的八面体形变成了掺杂后的球形。随着掺杂量的增加,晶体结构逐渐发生变化,形成了 Li0.96Nb1.01O3 杂质相。高价铌离子的掺入增加了材料中 Mn3+ 的含量,从而出现了 4 V 放电平台,并形成了 4.7 和 4 V 放电平台。掺杂铌可以提高 LiNi0.5Mn1.5O4 材料的循环稳定性,但材料的比容量会降低。
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引用次数: 0
Novel rod-like carbon nanomaterials as near infrared-responsive drug delivery system for potential anticancer applications 新型棒状碳纳米材料作为近红外响应型给药系统在抗癌领域的潜在应用
IF 1.3 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-01-23 DOI: 10.1049/mna2.12190
Mengru Liu, Xiaoxue Du, Jingyi Liu, Guangshuo Wang, Jiajia Yang, Xueling Wang, Shuai Han, Zhongchao Huo

The combination of chemotherapy and photothermal therapy shows great potential in cancer treatment, and the carbon nanomaterials have been attracted great attention in biomedical technology. However, it is still a great challenge to design stimuli-responsive nano-carbon-based drug release systems with integrated functions. In this paper, rod-like carbon nanomaterials (RCNs) were prepared by the soft template hydrothermal method with glucose as raw materials, which were proved to have high photothermal efficiency (∼23.7%), as well as good biocompatibility and excellent drug-loading capacity. After that, RCNs were used to load doxorubicin (DOX) as DOX@RCNs for integrated photothermal/chemotherapy towards cancer, which demonstrated 52.2% higher cancer cell killing efficiency than that of RCNs under near infrared (NIR) irradiation in vitro. The authors’ approach provided a novel NIR-responsive nano platform for combined photothermal/chemotherapy towards cancer, which was considered to be of great potential in anticancer applications.

化疗与光热疗法的结合在癌症治疗中显示出巨大的潜力,而碳纳米材料在生物医学技术中也引起了极大的关注。然而,如何设计出具有综合功能的刺激响应型纳米碳基药物释放系统仍然是一个巨大的挑战。本文以葡萄糖为原料,采用软模板水热法制备了棒状碳纳米材料(RCNs),证明其具有较高的光热效率(∼23.7%)、良好的生物相容性和优异的药物负载能力。随后,研究人员利用 RCNs 负载多柔比星(DOX),将其作为 DOX@RCNs 用于癌症的光热/化疗综合治疗,结果表明在体外近红外(NIR)照射下,DOX@RCNs 的癌细胞杀伤效率比 RCNs 高出 52.2%。作者的研究方法为癌症光热/化疗联合疗法提供了一种新型的近红外响应纳米平台,被认为在抗癌领域具有巨大的应用潜力。
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引用次数: 0
Preparation of nitrogen-doped carbon materials by orthogonal array design for supercapacitors 通过正交阵列设计制备用于超级电容器的掺氮碳材料
IF 1.3 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-01-22 DOI: 10.1049/mna2.12189
Cungui Zhong, Dayong Liu

Here, the authors report a practical method for preparing nitrogen-doped carbon materials using an orthogonal array design. The material with the highest specific capacitance value of 262 F·g−1 at a current density of 1 A·g−1 was obtained under the conditions (KOH as activation agent, activation temperature of 600°C, activation time of 3 h, respectively). Its high electrochemical properties are attributed to its high surface area and additional pseudo-capacitance. After 5000 cycles, the specific capacitance remained 92.8%, with good cycle stability. Textural characterization of the carbon materials was performed using N2 adsorption/desorption and scanning electron microscopy.

在此,作者报告了一种利用正交阵列设计制备掺氮碳材料的实用方法。在此条件下(分别以 KOH 作为活化剂、活化温度为 600°C、活化时间为 3 小时),获得了电流密度为 1 A-g-1 时比电容值最高的 262 F-g-1 材料。其较高的电化学特性归功于其较高的表面积和额外的假电容。经过 5000 次循环后,比电容保持在 92.8%,具有良好的循环稳定性。利用 N2 吸附/解吸和扫描电子显微镜对碳材料进行了纹理表征。
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引用次数: 0
Preparation of nanostructured cuprous oxide (Cu2O) absorber layer for photovoltaic application 制备用于光伏应用的纳米结构氧化亚铜(Cu2O)吸收层
IF 1.3 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-01-16 DOI: 10.1049/mna2.12188
Rabiul Awal, Nilufer Yesmin Tanisa, Md. Arifur Rahman, Shamim Ahmed

In this investigation, a nanostructured Cu2O thin film absorber layer is electrodeposited, exploring the impact of varying negative applied voltages and deposition time. Notably, the Cu2O thin film demonstrated optimal absorbance at −0.95 V, contrasting sharply with a minimum at −0.97 V. The authors' findings underscore that the peak absorbance was achieved at −0.95 V, coinciding with the lowest transmittance observed after 80 min of deposition, aligning with a maximal absorption coefficient of 21 × 103 cm−1. At a deposition time of 5 min, the Cu2O thin film exhibited a noteworthy maximum Urbach energy of 2.00 eV and a minimum steepness parameter of 0.013. In contrast, the lowest Urbach energy was recorded at 0.34 eV, with the highest steepness parameter occurring at an applied voltage of 0.93 V. Furthermore, this study revealed a gradual increase in the refractive index with higher applied voltages, reaching its pinnacle at −1.5 V. These results collectively emphasize the nuanced interplay between applied voltage, deposition time and the optical properties of the nanostructured Cu2O thin film. The observed trends hold significant implications for optimizing the performance of thin film absorber layers, particularly in the context of enhancing absorbance and tailoring optical characteristics for specific applications.

在这项研究中,电沉积了纳米结构的 Cu2O 薄膜吸收层,探讨了不同负电压和沉积时间的影响。值得注意的是,Cu2O 薄膜在 -0.95 V 时显示出最佳吸光度,与 -0.97 V 时的最低吸光度形成鲜明对比。作者的研究结果强调,吸光度峰值出现在 -0.95 V,与沉积 80 分钟后观察到的最低透射率相吻合,与 21 × 103 cm-1 的最大吸收系数相一致。沉积时间为 5 分钟时,Cu2O 薄膜显示出值得注意的 2.00 eV 最大乌巴赫能和 0.013 最小陡度参数。相反,最低的乌巴赫能为 0.34 eV,最高的陡度参数出现在 0.93 V 的施加电压下。此外,这项研究还发现,折射率随着施加电压的升高而逐渐增加,在-1.5 V时达到顶峰。这些结果共同强调了施加电压、沉积时间和纳米结构 Cu2O 薄膜光学特性之间微妙的相互作用。观察到的趋势对优化薄膜吸收层的性能具有重要意义,特别是在提高吸收率和为特定应用定制光学特性方面。
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引用次数: 0
Temperature drift suppression for micro-electro-mechanical system gyroscope based on vibrational-displacement control with harmonic amplitude ratio 基于谐波振幅比振动位移控制的微机电系统陀螺仪温度漂移抑制技术
IF 1.3 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-01-03 DOI: 10.1049/mna2.12187
Feng Bu, Rui Feng, Shuwen Guo, Ming Zhou, Yiwang Wang, Feng Wang

Micro-electro-mechanical system gyroscope detection output is susceptible to drift due to ambient temperature variations. Furthermore, the drive-mode vibration amplitude is affected by the signal pickup circuit and structural parameters, which significantly influence the temperature drift of the bias and scale factor (SF). This study proposes a vibration amplitude control method based on harmonic amplitude sideband-ratio (SBR), namely SBR-AGC, which characterizes the vibration amplitude using the harmonic amplitude ratio of the vibrational electrical signal. The constancy of vibration amplitude is maintained via closed-loop control to suppress bias and SF temperature drift. The experimental results on cobweb-like disk resonator gyroscope reveal that the temperature coefficient of bias in the SBR-AGC mode lies within −20 to 60°C and decreases by 36%, and the temperature coefficient of the SF lies within −10 to 50°C and decreases by 49.7%. Therefore, the environmental adaptability of the gyroscope is effectively improved.

微机电系统陀螺仪的检测输出易受环境温度变化的影响而发生漂移。此外,驱动模式的振动幅度会受到信号拾取电路和结构参数的影响,从而对偏置和比例因子(SF)的温度漂移产生重大影响。本研究提出了一种基于谐波振幅边带比(SBR)的振动振幅控制方法,即 SBR-AGC,它利用振动电信号的谐波振幅比来表征振动振幅。通过闭环控制来抑制偏差和 SF 温度漂移,从而保持振动振幅的恒定性。蛛网状圆盘谐振器陀螺仪的实验结果表明,在 SBR-AGC 模式下,偏压的温度系数在 -20 至 60°C 范围内下降了 36%,而 SF 的温度系数在 -10 至 50°C 范围内下降了 49.7%。因此,陀螺仪的环境适应性得到了有效改善。
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引用次数: 0
Preconcentration and measurement of trace Amitriptyline hydrochloride in water samples using magnetic nanoparticles with dispersive solid-phase extraction 利用磁性纳米颗粒和分散固相萃取技术预富集和测量水样中的痕量盐酸阿米替林
IF 1.3 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-12-23 DOI: 10.1049/mna2.12184
Arghavan Amin, Ali Moghimi

In the separation and determination of trace amounts of drugs in aqueous samples, there is a major challenge in synthesizing highly efficient, cost-effective, and easy-to-use adsorbents based on natural polymers, which are also biocompatible and biodegradable. In the proposed method, magnetite nanoparticles (Fe3O4) on chitosan (as the carrier) modified with β-cyclodextrin (BCD) were used as a suitable adsorbent for the pre-concentration and solid-phase extraction of trace amounts of Amitriptyline HCl (hydrochloride). Ultraviolet spectrophotometer (λ = 236 nm) was the main instrument used for analyte detection and quantification. Moreover, X-ray diffraction, Fourier transform infrared spectroscopy, Field Emission Scanning Electron Microscopy, and Energy-Dispersive X-ray were used for the identification and characterization of the structure and morphology of the adsorbent and to establish the formation of the synthesized magnetic nanosorbents, as well as to confirm the analyte binding to the adsorbent. Experimental variables affecting the extraction/pre-concentration and determination of the analyte were investigated and optimized; pH of the sample solution, the amount of NaCl salt (in terms of ionic strength of the solution), the amount of adsorbent, temperature, adsorption time, and volume of the eluent (methanol) were the optimized parameters. Finally, the method was successfully applied for the determination of spiked Amitriptyline hydrochloride (HCl) in tap water and human urine samples. Also, High-Performance Liquid Chromatography was performed on the aqueous samples to compare the proposed method with the USP (the United States Pharmacopeia) standard method of Amitriptyline HCl assay and after performing a t-test (confidence level of 95%), no significant difference was observed between the two methods. High accuracy and precision (RSD = 3.91%), High analysis speed, few limitations, low expenses, pure extracted analyte, and low waste were the advantages of this method. This method was also compatible with many existing device methods. Under the optimized experimental conditions, the calibration graph was linear in the range of 0.183 to 50 mg.L−1 with a correlation coefficient of 0.996. RSD of the method was 3.91%, the limit of detection was 37.8 µg.L−1, the maximum sorption capacity of the adsorbent for Amitriptyline hydrochloride was 306.525 mg.g−1 and the preconcentration factor was 3.61. Eventually, the proposed method was compared to other methods that have been performed for the determination of Amitriptyline hydrochloride.

在分离和测定水样中的痕量药物时,合成基于天然聚合物的高效、经济、易用且具有生物相容性和生物降解性的吸附剂是一项重大挑战。在所提出的方法中,壳聚糖(作为载体)上的磁铁矿纳米颗粒(Fe3O4)被β-环糊精(BCD)修饰,被用作预浓缩和固相萃取痕量盐酸阿米替林(盐酸盐)的合适吸附剂。紫外分光光度计(λ = 236 nm)是检测和定量分析的主要仪器。此外,还使用了 X 射线衍射、傅立叶变换红外光谱、场发射扫描电子显微镜和能量色散 X 射线来鉴定吸附剂的结构和形态,确定合成磁性纳米吸附剂的形成,以及确认分析物与吸附剂的结合。对影响萃取/预浓缩和分析物测定的实验变量进行了研究和优化;样品溶液的 pH 值、NaCl 盐的用量(溶液的离子强度)、吸附剂的用量、温度、吸附时间和洗脱液(甲醇)的体积是优化参数。最后,该方法被成功地应用于自来水和人体尿液样品中盐酸阿米替林(HCl)的测定。此外,还对水样进行了高效液相色谱分析,以比较所提议的方法与 USP(美国药典)盐酸阿米替林标准方法。该方法的优点是准确度和精密度高(RSD = 3.91%)、分析速度快、局限性小、费用低、提取的分析物纯、废物少。该方法还与许多现有的装置方法兼容。在优化的实验条件下,该方法在 0.183 至 50 mg.L-1 范围内线性关系良好,相关系数为 0.996。方法的 RSD 为 3.91%,检出限为 37.8 µg.L-1,吸附剂对盐酸阿米替林的最大吸附量为 306.525 mg.g-1,预富集因子为 3.61。最后,将所提出的方法与其他测定盐酸阿米替林的方法进行了比较。
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引用次数: 0
Biopolymer-based nanoparticles as promising candidate for inducing apoptosis in liver cancer cells 以生物聚合物为基础的纳米粒子有望诱导肝癌细胞凋亡
IF 1.3 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-12-20 DOI: 10.1049/mna2.12183
Mahsa Hoseinzadeh, Mohammad Javad Mokhtari, Farshid Kafilzadeh, Javad Mohammadnejad, Yaghoob Taheri

Liver cancer is one of the most common causes of death all around the globe. On the other hand, conventional modalities, such as chemotherapy and surgery, have not been effectively suppressed cancer incidence due to some deficiencies. As a result, a novel folic acid (FA)-decorated poly lactic-co-glycolic acid (PLGA)-Alginate (Alg) nanocarrier was efficiently developed for active doxorubicin (Dox) delivery to human HepG2 liver cancer cells. The in vitro assays, including cell viability assay (MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) test), apoptosis, cell cycle arrest, and cellular uptake, were applied to evaluate the cancer cell growth suppression and apoptosis-inducing ability of the nanocarrier. More than 85% cytotoxicity was attained after 24 h of treatment with 400-nM concentration of FA-PLGA-Dox-Alg. More than 21% and 61% apoptosis were observed after 24 h of treatment with 100-nM concentrations of FA-PLGA-Dox-Alg in apoptosis and cell cycle arrest assays. The cellular uptake of the FA-PLGA-Alg nanocarrier was about 30% higher than that of the PLGA-Alg carrier which indicated the cancer cell targeting ability of the FA-PLGA-Alg sample. These results have indicated the potential capability of FA-PLGA-Dox-Alg in the inhibition of liver cancer cells.

肝癌是全球最常见的死亡原因之一。另一方面,化疗和手术等传统方法由于存在一些缺陷,未能有效抑制癌症的发病率。因此,我们开发了一种新型叶酸(FA)装饰聚乳酸-聚乙二醇酸(PLGA)-海藻酸(Alg)纳米载体,可有效地将多柔比星(Dox)递送至人类 HepG2 肝癌细胞。该纳米载体具有抑制癌细胞生长和诱导细胞凋亡的能力,其体外检测方法包括细胞活力检测(3-(4,5-二甲基噻唑-2-基)-2,5-二苯基溴化四氮唑试验)、细胞凋亡、细胞周期停滞和细胞摄取。使用 400-nM 浓度的 FA-PLGA-Dox-Alg 处理 24 小时后,细胞毒性达到 85% 以上。用 100-nM 浓度的 FA-PLGA-Dox-Alg 处理 24 小时后,在细胞凋亡和细胞周期停滞试验中分别观察到 21% 和 61% 以上的细胞凋亡。FA-PLGA-Alg纳米载体的细胞吸收率比PLGA-Alg载体高出约30%,这表明FA-PLGA-Alg样品具有癌细胞靶向能力。这些结果表明了 FA-PLGA-Dox-Alg 在抑制肝癌细胞方面的潜在能力。
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引用次数: 0
期刊
Micro & Nano Letters
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