COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2024
·
IF 8.1
Mengxia Shen,Xinyu Xu,Jiale Qi,Xiaojie Li,Bailiang Xue,Meng Zhu,Zhengliang Zhang,Xunfei Zheng,Bin Li,Zhen Shang
With the miniaturization of electronic devices, the creation of efficient and lightweight electromagnetic interference (EMI) shielding materials is of imminent significance. In this context, we reported an electromagnetic shielding membrane with hydrophobic, antioxidative, and high temperature stability. The chemically cross-linked Aramid nanofibers (ANF)/MXene@Ga/Gd 2 O 3 (CAMG) nanocomposite membranes exhibit a considerable tensile strength and possess exceptional flexibility. The CAMG shielding membranes demonstrate multiple heterogeneous interfaces and a magnetic-dielectric synergistic system, thereby effectively enhancing the absorption shielding efficiency, with the specific shielding effectiveness per unit volume (SSE/t) reaching 6788 dB cm 2 g −1 . Furthermore, the composite membranes demonstrate remarkable electrothermal capabilities, acting as pliable heaters with notable, swiftly replicable, and consistent electrothermal effects at reduced voltages. Additionally, they possess superior heat dissipation efficiency and ensure a uniform heat dispersion. The exceptional electromagnetic shielding performance and multifunctionality of the C-ANF/MXene@Ga/Gd 2 O 3 shielding membranes imply their instructive relevance in next-generation fields such as flexible electronics and aerospace.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2020
·Vol. 27
·期 1
·269-277
·
IF 2.394
Zheng Qian,Zhang Heng,Meng Bin,Liang Wenke,Li Chen,Ping Xinyu,Xia Zhidong
Magnesium oxide can be added into Gd-doped CeO 2 (GDC) as a suitable sintering additive, and the continuous GDC/MgO heterogeneous interface will contribute to the promotion of the oxygen ion transmission. GDC-50vol%MgO composite ceramics were sintered at different temperatures (1350~1500 °C). The phase composition, micromorphology, and electrical conductivity of GDC-50vol%MgO were analyzed by XRD, SEM, TEM, and electrochemical impedance, respectively. There are only GDC and MgO phases in the ceramics sintered at 1350 °C, 1400 °C, 1450 °C, and 1500 °C. As the sintering temperature rises from 1350 to 1500 °C, the average grain size of GDC and MgO increases from 239/274 to 680/651 nm, respectively. The GDC/MgO heterogeneous interface is clear, and many edge dislocations form there. The grain boundary and total conductivities decrease significantly with the rising sintering temperature, and the GDC/MgO heterogeneous interface possesses a higher electrical conductivity than the GDC/GDC homogeneous interface.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
POLYMER COMPOSITES
·
2024
·
IF 4.8
Lingfei Xin,Yaodong Dai,Bingbing Qian,Chuqing Yao,Guohui Wang
The properties of rubber can be changed by controlling the radiation conditions, so as to be suitable for specific application scenarios. This study compares the structure, mechanical properties, cross-linking density, thermal properties, and shielding properties of polyethylene wax/gadolinium oxide/methyl vinyl silicone rubber (PEW/Gd 2 O 3 /MVQ) under different radiation doses and atmospheric conditions. The results showed that the tensile strength of the neutron shielding rubber exhibited growth and subsequently decreased with increasing irradiation dosage, and the tensile strength reached the optimum value of 8.29 MPa after 25 kGy in air. The hardness and cross-linking density of the sample increase with the increase of the dose, and especially the hardness and cross-linking density of the sample irradiated in the air atmosphere at 25 kGy were better than that in the vacuum. The addition of PEW to the rubber significantly increased the thermal neutron-shielding rate, from 74.10% to 86.59% when 36 phr of Gd 2 O 3 was added. The thermal neutron-shielding rate increased from 84.42% to 88.39% when irradiated 50 kGy in air. It was found that the comprehensive performance of the rubber was optimized after irradiation of 25 kGy in the air atmosphere. Highlights The mechanical properties of rubber are enhanced by low-dose irradiation in air. Irradiation of rubber in air is superior to irradiation in vacuum, with optimal results at 25 kGy. Rubber maintains thermal stability at low doses of irradiation. The addition of PEW improves the shielding properties. Rubber retains excellent thermal neutron-shielding properties after irradiation.
研究领域:
材料科学
·
核技术应用
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Advances
·
2021
·Vol. 4
·期 1
·95-101
·
IF 4.553
Yanyue Liu,Yingfan Dai,Haifeng Li,Dida Duosiken,Na Tang,Kang Sun,Ke Tao
Gadolinium oxide nanoparticles (GONs) have the potential to be one of the best candidates for the contrast agents of magnetic resonance imaging. Even though the influence of parameters on the relaxation has been substantially demonstrated, the variation of the r1 of GONs with a similar structure and surface chemistry implied our limited understanding. We herein synthesized GONs with adjustable size, shape, and crystallinity, modified them with a series of molecules with different acidities, and recorded their r1 values and imaging contrast. Our results showed that the isoelectric point could be regarded as an indicator of the relaxation covering the influence of both surface modification and size, which highlighted the impact of protons dissociated from the contrast agents. We further showed that the nanoparticles with lower crystallinity possess higher relaxivity, and this phenomenon manifested significantly under a low field. Our work clarified that the longitudinal relaxivity of Gd2O3 nanoparticles is sensitively dependent on the numbers of H+ generated from the surface and in the environment, which may shed light on developing high-performance nanoparticulate T1 contrast agents.
研究领域:
纳米技术
·
磁共振成像
·
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOMEDICINE & PHARMACOTHERAPY
·
2022
·
IF 7.419
Jianfeng Bao,Shuangshuang Guo,Xiangyang Zu,Yuchuan Zhuang,Dandan Fan,Yong Zhang,Yupeng Shi,Xin Pang,Zhenyu Ji,Jingliang Cheng
Nowadays, about 30% of magnetic resonance imaging (MRI) exams need contrast agents (CAs) to improve the sensitivity and quality of the images for accurate diagnosis. Here, a multifunctional nano-agent with ring-like vortex-domain iron oxide as core and gadolinium oxide as shell (vortex nanoring Fe 3 O 4 @Gd 2 O 3 , abbreviated as VNFG) was firstly designed and prepared for highly enhanced T 1 -T 2 dual-modality magnetic resonance imaging (MRI)-guided magnetic thermal cancer therapy. After thorough characterization, the core-shell structure of VNFG was confirmed. Moreover, the excellent heat generation property (SAR=984.26 W/g) of the proposed VNFG under alternating magnetic fields was firmly demonstrated. Furthermore, both in vitro and in vivo studies have revealed a good preliminary indication of VNFG’s biological compatibility, dual-modality enhancing feature and antitumor efficacy. This work demonstrates that the proposed VNFG can be a high-performance tumor diagnosis and theranostic treatment agent and may have great potential for clinical application in the future.
研究领域:
纳米技术
·
生物医学工程
·
癌症治疗
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磁共振成像
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Zhongtao Li,Jing Guo,Mengmeng Zhang,Guohua Li,Liguo Hao
Magnetic resonance molecular imaging can provide anatomic, functional and molecular information. However, because of the intrinsically low sensitivity of magnetic resonance imaging (MRI), high-performance MRI contrast agents are required to generate powerful image information for image diagnosis. Herein, we describe a novel T 1 contrast agent with magnetic-imaging properties facilitated by the gadolinium oxide (Gd 2 O 3 ) doping of mesoporous silica nanoparticles (MSN). The size, morphology, composition, MRI relaxivity ( r 1 ), surface area and pore size of these nanoparticles were evaluated following their conjugation with Gd 2 O 3 to produce Gd 2 O 3 @MSN. This unique structure led to a significant enhancement in T 1 contrast with longitudinal relaxivity ( r 1 ) as high as 51.85 ± 1.38 mM −1 s −1 . Gd 2 O 3 @MSN has a larger T 1 relaxivity than commercial gadolinium diethylene triamine pentaacetate (Gd-DTPA), likely due to the geometrical confinement effect of silica nanoparticles. These results suggest that we could successfully prepare a novel high-performance T 1 contrast agent, which may be a potential candidate for in-vivo MRI.
研究领域:
材料科学
·
纳米技术
·
医学影像
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Kaipeng Tian,Jiawei Mu,Zijie Li,Yibo Yang,Kuibao Zhang,Kailei Lu,Jianqi Qi,Tiecheng Lu
Advanced nuclear plants demand shielding windows for in situ monitoring and robust shielding against gamma (γ) and neutron (n) radiation. However, existing windows lack simultaneous γ/n attenuation and sufficient fracture toughness, hindering practical deployment. To address this, a novel Gd 3 TaO 7 transparent ceramics (GTO-TCs) for an efficient n and γ dual-shielding window is proposed and demonstrated. The developed GTO ceramic window exhibits high optical transmittance (78% at 2000 nm) and excellent mechanical properties (Hv and K IC are 9.61 GPa and 2.60 MPa·m 1/2 , respectively). Significantly, the GTO ceramic presents a γ-ray linear absorption coefficient of 0.34 for over 90% γ attenuation from 60 Co at 5.8 cm thickness, coupled with Monte Carlo verified full thermal n attenuation (<0.4 eV) at merely 2 mm. The developed GTO window possesses excellent n and γ dual-shielding properties, robust fracture toughness, and has promising prospects for service in extreme nuclear environments.
研究领域:
材料科学
·
核工程
·
无机非金属材料
·
辐射防护
·
先进陶瓷
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2019
·Vol. 43
·期 13
·7614-7626
·
IF 3.343
Mangmang Shi,Yinglin Yan,Yiqi Wei,Yiming Zou,Qijiu Deng,Juan Wang,Rong Yang,Yunhua Xu,Tong Han
Summary Carbon aerogel (CA), possessing abundant pore structures and excellent electrical conductivity, have been utilized as conductive sulfur hosts for lithium-sulfur (Li-S) batteries. However, a serious shuttle effect resulted from polysulfide ions has not been effectively suppressed yet due to the weak absorption nature of CA, resulting in rapid decay of capacity as the cycle number increases. Herein, ultrafine (~3 nm) gadolinium oxide (Gd 2 O 3 ) nanoparticles (with upper redox potential of ~ 1.58 V versus Li + /Li) are uniformly in-situ integrated with CA through directly sol-gel polymerization and high-temperature carbonization. The Gd 2 O 3 modified CA composites (named as Gdx-CA, where x means molar ratio of Gd 2 O 3 nanoparticles to carbon) are incorporated with S. Then, the products (S/Gdx-CA) are acted as sulfur host materials for Li-S batteries. The results demonstrate that adding ultrafine Gd 2 O 3 nanoparticles can dramatically improve the electrochemical properties of the composite cathodes. The S/Gd2-CA electrode (loading with 58.9 wt% of S) possesses the best electrochemical properties, including a high initial capacity of 1210 mAh g −1 and a relatively high capacity of 555 mAh g −1 after 50 cycles at 0.1 C. It is noteworthy that the performance of long-term cycle (350 cycles) for the S/Gd2-CA (317 mAh g −1 after 100 cycles and 233 mAh g −1 after 350 cycles at 1 C) is improved significantly than that of S/CA (150 mAh g −1 after 150 cycles at 1 C). Overall, the enhancement of electrochemical performances can be due to the strong polar nature of the ultrafine Gd 2 O 3 nanoparticles, which provide strong adsorption sites to immobilize S and polysulfide. Furthermore, the Gd 2 O 3 nanoparticles present a catalytic effect. Our research suggests that adding Gd 2 O 3 nanoparticles into S/CA composite cathode is an effective and novelty method for improving the electrochemical performances of Li-S batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米科技
·
无机非金属材料
✓ 已验证
DOI
高影响因子
Biomedical Materials
·
2021
·Vol. 16
·期 4
·044104
·
IF 3.715
Yashuang Miao,Peirong Chen,Miao Yan,Jianmin Xiao,Biao Hong,Ke Zhou,Guilong Zhang,Junchao Qian,Zhengyan Wu
Single-mode magnetic resonance imaging (MRI) contrast agents (CAs) in clinical settings are easily disturbed by calcification, bleeding, and adipose signals, which result in inaccurate diagnoses. In this study, we developed a highly efficient T1–T2 dual-mode MRI CA using an ultra-small gadolinium oxide-decorated magnetic iron oxide nanocrystal (GMIO). The gadolinium element could effectively alter the magnetic properties of the GMIO from soft-ferromagnetism to superparamagnetism. In addition, when the Gd/Fe ratio was 15% (designated as GMIO-2), the GMIO-2 possessed the best superparamagnetism and highest magnetism. Subsequently, T1 and T2 values of GMIO-2 were measured through a series of turbo spin-echo images and then multi-spin echo sequence, respectively. Based on this, T1 and T2 relaxivities of GMIO-2 were calculated and were the highest (r1: 1.306 m M−1 s−1 and r2: 234.5 m M−1 s−1) when compared to other groups. The cytotoxicity of GMIO-2 was negligible under a wide range of dosages, thus exhibiting excellent cell biocompatibility. Moreover, GMIO-2 could quickly diffuse into cells, leading to its effective accumulation. The systemic delivery of GMIO-2 resulted in an excellent T1–T2 dual-mode MRI contrast effect in kidneys, which is expected to improve the diagnosis of kidney lesions. Therefore, this work provides a promising candidate for the development of a T1–T2 dual-mode MRI CA.
研究领域:
医学影像
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纳米技术
·
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Libo He,Yongkun Wang,Guoxiang Zhang,Wei Zhao,Lu Zhang,Peipei Li,Chen Su,Zhifeng Wu,Xiaowei Liu
In this work, we report a facile strategy for synthesizing hydrophilic Gd(OH)3 sheets via a Gd-based interfacial precipitation reaction at the interface of organosilane-modified Gd2O3 nanoparticles and a cation exchange resin. This strategy, independent of the specific organosilane used, produces two-dimensional sheets with a distinct lamellar structure and excellent aqueous dispersibility. Characterization confirms the formation of Gd(OH)3 sheets with promising fluorescent and magnetic properties.
研究领域:
无机纳米材料
·
生物医学成像
·
纳米化学
·
功能材料
·
稀土材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RARE METALS
·
2020
·Vol. 40
·期 8
·2049-2058
·
IF 2.161
Fu Rong,Hu Yan-Yan,Qiao Hui-Na,Yang Chun-Lin,Yin Hao,Ou Mei-Gui
Gd 2 O 3 :Tb 3+ nanocrystal co-doped with Zn 2+ and Li + was prepared by the combination of polyol and solid-phase methods. The synthesized nanoparticles were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), photoluminescence (PL) spectra and magnetic resonance imaging (MRI). The results revealed that both Gd 2 O 3 :Tb 3+ /Zn 2+ and Gd 2 O 3 :Tb 3+ /Li + had cubic unit structures with a spherical shape, and the fluorescence intensity of the nanoparticles reached a maximum at a doping concentration of 0.050 mmol% for Zn 2+ and 2 mol% for Li + , respectively. In addition, the T 1 / T 2 (longitudinal/transverse relaxation time)-weighted MRI signals got enhanced due to the increased longitudinal relaxivity ( r 1 ) and transverse relaxivity ( r 2 ) after the doping by metal ions. Therefore, the materials reported here can be used for fluorescence and MR bimodal imaging, as tracers and for fluorescence detections. Graphic abstract
研究领域:
材料科学
·
纳米医学
·
生物影像学
·
分子探针
·
生物材料
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 18
·1421
·
IF 4.3
Qin Li,Jian Chen,Xingwu Zhang,Chenjie Ruan,Weiwei Wu
With the rapid growth of nuclear energy, effective shielding of radioactive nuclear by-products is critical for safety and environmental protection. Gadolinium (Gd) is ideal for neutron shielding due to its exceptionally high thermal neutron capture cross-section. Despite significant progress in developing various Gd-based shielding materials, poor interfacial compatibility between Gd2O3and polymer matrices remains a significant limitation. In this study, we addressed this challenge by successfully modifying Gd2O3nanoparticles (Gd2O3@SIT-M) through the construction of a dual-layer molecular coating using electrostatic interactions. Initially, Gd2O3was functionalized with the silane coupling agent 3-(trihydroxysilyl) propyl-1-propane-sulfonic acid (SIT), followed by subsequent assembly of polyether amine M2070 onto this modified surface. The combined presence of hydrophilic sulfonic acid groups from SIT and amine-ether groups from M2070 endowed Gd2O3@SIT-M nanoparticles with excellent hydrophilicity, significantly reducing their aqueous contact angle to 14.34°. Consequently, this modification strategy notably enhanced the dispersion stability of Gd2O3nanoparticles in aqueous solutions and polymer matrices. The developed approach thus provides an effective pathway for fabricating advanced polymer-based neutron shielding materials with improved dispersibility, stability, and overall performance.
研究领域:
材料科学
·
核工程
·
纳米技术
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）