JOURNAL OF POROUS MATERIALS
·
2024
·Vol. 31
·期 3
·1043-1051
·
IF 2.5
Zhang Zhengxin,Zhang Deqi,Yang Li,Hou Ming,Gao Jiyun,Xia Yi,Guo Shenghui
Modifying with rare earth elements has been proven to be an effective means of enhancing the gas-sensing properties of oxides. In this work, Gd-In 2 O 3 based sensor was developed, which showed high response to 100 ppm xylene gas ( \({R}_{a}/{R}_{g}\) = 17.8) fast response time (11 s) at 350 °C, this response value was 5.4 times higher compared to the unmodified In 2 O 3 sensor ( \({R}_{a}/{R}_{g}\) =3.3). The introduction of the rare earth element not only improves the electrical properties of the sensitive material to provide a more suitable resistance but also strengthens the gas adsorption ability and the catalytic effect on the surface of the sensitive material, leading to enhanced sensing performance.
研究领域:
材料科学
·
传感技术
✓ 已验证
DOI
高影响因子
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2023
·Vol. 110
·期 2
·1-8
·
IF 2.7
Wu Shaoxiong,Wang Lianyuan,Zhu Haiyan,Yuan Ling,Li Jian,Ge Liang,Zhang Hongpeng,Miao Ting,Cheng Zhenxing
The analysis of nerve agents is the focus of chemical warfare agent determination because of their extreme toxicity. A classical chemical colorimetric method, namely, the Schoenemann reaction, has been developed to detect G agents; however, it has not been utilized for VX analysis mainly because of its low peroxyhydrolysis rate. In this study, based on the mechanism of the Schoenemann reaction, a novel rapid quantitative determination method for VX was developed by optimizing the reaction conditions, such as concentrations of peroxide and the indicator, temperature, and reaction time. Using 2 ml 0.5 wt% sodium perborate as the peroxide source, 1 ml 0.1 wt% benzidine hydrochloride as the indicator, and 1 ml acetone as the co-solvent, VX and GD in ethanol or water solutions could be quantitatively analyzed within 15 min at 60°C. Further experiments based on 31 P NMR spectroscopy confirmed the existence of a peroxyphosphate intermediate during the GD assay. This quantitative colorimetry system for VX and GD analysis can be developed as a portable device for the water samples in fieldwork applications.
研究领域:
化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Results in Chemistry
·
2023
·
IF 2.3
Beibei Zheng,Chufei Miao,Han Xu,Jiaqi Lai,Meng Li,Jumei Tian
Two isostructural lanthanide-based coordination polymers, namely, {[Gd 2 (H 2 dhtp) 3 (DMF) 2 (H 2 O) 4 ]·2DMF·H 2 On ( 1 ) and {[Dy 2 (H 2 dhtp) 3 (DMF) 2 (H 2 O) 4 ]·2DMF·H 2 O}n ( 2 ) (H 4 dhtp = 2,5-dihydroxyterephthalic acid, DMF = N, N-dimethylformamide) were synthesized and structurally characterized by single-crystal X-ray diffraction, IR, powder X-ray diffraction (PXRD), thermogravimetric analysis (TGA), and elemental analysis. Compounds 1 and 2 exhibited 3D networks and isostructures, except for the distinction of the metal ion. Magnetic measurements indicated that complex 1 exhibited the dominating contribution at low temperature of zero-field splitting for Gd(III) materials, and the complex 2 shown the depopulation of the excited excited state for Dy(III) material. The solid luminescent properties of H 4 dhtp, 1 , and 2 displayed a blue emission band, while the solution state luminescent properties all demonstrated a green emission band. The combination of luminescence sensing and magnetism in single-phase coordination polymers may offer great potential applications in smart multitasking devices.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Honglin Zhang,Ting Liu,Qiuhe Li,Xiyu Zhang,Hua Zhao,Yangdong Zheng,Feng Qin,Zhiguo Zhang,Tianqi Sheng,Ye Tian
The oxygen sensing enhancement based on room temperature phosphorescence (RTP) of Gd-HMME adjusted by imidazole was studied. The phosphorescence intensity I P0 and the Stern-Volmer equations under different imidazole concentration were obtained, and the physical mechanism of imidazole regulating the oxygen quenching constant K SV was analyzed. It was found that the K SV value increased by ∼46 folds in the range of 12.4(1)–576.1(5) kPa −1 , and the large-scale variation of K SV is conducive to the realization of high precision oxygen concentration measurement in a wide range. In addition, the standard deviation σ of continuous measurement results was given, and the limit of detection (LOD) was determined to be 6.6 ppm.
研究领域:
分析化学
·
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEDICINAL CHEMISTRY
·
2024
·
IF 6.8
Yinghui Ding,Xinzhong Ruan,Kun Shu,Weiyuan Xu,Yao Liu,Gengshen Mo,Jiao Xu,Yong Jian,Jilai Zhang,Lingfeng Zhang,Keren Wang,Ji-Ting Hou,Jianliang Shen,Zhihan Yan,Fangfu Ye,Jiang Zhu,Lixiong Dai
Hepatobiliary-specific magnetic resonance imaging contrast agents (MRI CAs) play a crucial role in the early diagnosis of hepatocellular carcinoma (HCC). However, only two acyclic CAs, Gd-BOPTA and Gd-EOB-DTPA, exhibit unfavorable kinetic inertness. Our study focused on the development of superior stable innovative macrocyclic CAs. By introducing a lipophilic benzyloxy group (OBn) into the H4DOTA ring (Gd-L1), we achieved significant enhancement in kinetic inertness. In vivo experiments in mice demonstrated that 40% of the dosage was distributed to the liver at 5 min, providing sustained hepatic enhancement for over 35 min. We also developed an MPO-responsive MRI CA (Gd-L3), which can participate in the “peroxidase cycle” as the substrate, generating oligomers with a 3.8-fold increase in relaxivity, and selectively enhance the lesion in an acute gout mouse model. Overall, our work represents a significant advancement in the field of hepatic and inflammatory MRI, offering promising avenues for early diagnosis and improved imaging outcomes.
研究领域:
医学成像
·
药物化学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RARE METALS
·
2016
·Vol. 41
·期 12
·4273-4278
·
IF 0.957
Huang Shuang,Xu Hua-Lan,Wang Lei,Zhong Sheng-Liang
Rice-like Gd(OH) 3 nanorods were successfully prepared through a facile and rapid microwave-hydrothermal synthesis method without using any surfactants or templates. X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED) and energy-dispersive spectroscopy (EDS) were used to characterize the samples. Results show that the nanorods have an average length of 400 nm and an average diameter of 50 nm. The effects of reaction parameters such as reaction temperature and time on the preparation were briefly investigated. It is found that the crucial factor for the formation of rice-like Gd(OH) 3 nanorods is reaction time. When the rice-like Gd(OH) 3 nanorods was codoped with Yb 3+ and Er 3+ , strong upconversion emissions could be observed under the excitation of 980-nm-laser, and the calculated CIE color coordinates falls within the yellow region, which may be potential candidate for optical materials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 63
·40148-40158
·
IF 3.361
Chen Hu,Qunying Huang,Yutao Zhai
None of the currently commercialized shielding materials in Generation IV nuclear energy systems are satisfactory in their performance. Developing a candidate neutron shielding material with good heat resistance and high strength is a challenging task. In this work, various gadolinium metal–organic frameworks (Gd-MOFs) with obvious advantages, such as porous structures, organic surfaces and strong neutron-absorbing nuclei, were synthesized to constrain polyimide (PI) chains. A series of Gd-MOF/PI conjugates were subsequently assessed for their thermal stability, mechanical properties and neutron shielding performance. The increase of the Gd-MOF content improved the thermal neutron shielding ability but slightly reduced the fast neutron shielding ability. Compared with those of pure PI, the Gd-MOF/PI films demonstrate a higher glass transition temperature (Tg), which is considered the gold standard of engineering plastics. It was also observed that the tensile strength directly correlates with the Gd-MOF content, which continuously increases until a maximum is reached, and then subsequently decreases. Furthermore, the high-temperature tensile test showed that these tunable Gd-MOF/PI films are intact and robust, indicating their potential application for neutron shielding materials in Generation IV nuclear energy systems.
研究领域:
材料科学
·
核能工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2021
·Vol. 14
·期 19
·5598
·
IF 3.623
Huajiang Zhou,Shaozhao Wang,Daowen Wu,Qiang Chen,Yu Chen
In this work, a kind of Gd/Cr codoped Bi3TiNbO9Aurivillius phase ceramic with the formula of Bi2.8Gd0.2TiNbO9+ 0.2 wt% Cr2O3(abbreviated as BGTN−0.2Cr) was prepared by a conventional solid-state reaction route. Microstructures and electrical conduction behaviors of the ceramic were investigated. XRD and SEM detection found that the BGTN−0.2Cr ceramic was crystallized in a pure Bi3TiNbO9phase and composed of plate-like grains. A uniform element distribution involving Bi, Gd, Ti, Nb, Cr, and O was identified in the ceramic by EDS. Because of the frequency dependence of the conductivity between 300 and 650 °C, the electrical conduction mechanisms of the BGTN−0.2Cr ceramic were attributed to the jump of the charge carriers. Based on the correlated barrier hopping (CBH) model, the maximum barrier heightWM, dc conduction activation energyEc, and hopping conduction activation energyEpwere calculated with values of 0.63 eV, 1.09 eV, and 0.73 eV, respectively. Impedance spectrum analysis revealed that the contribution of grains to the conductance increased with rise in temperature; at high temperatures, the conductance behavior of grains deviated from the Debye relaxation model more than that of grain boundaries. Calculation of electrical modulus further suggested that the degree of interaction between charge carriersβtended to grow larger with rising temperature. In view of the approximate relaxation activation energy (~1 eV) calculated fromZ″andM″ peaks, the dielectric relaxation process of the BGTN−0.2Cr ceramic was suggested to be dominated by the thermally activated motion of oxygen vacancies as defect charge carriers. Finally, a high piezoelectricity ofd33= 18 pC/N as well as a high resistivity ofρdc= 1.52 × 105Ω cm at 600 °C provided the BGTN−0.2Cr ceramic with promising applications in the piezoelectric sensors with operating temperature above 600 °C.Keywords:Aurivillius phase ceramic;Bi3TiNbO9;electrical conduction behaviors;impedance spectrum;electrical modulus
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Gang Zhang,Wenxia Ma,Yuqin Feng,Ming Yang,Zheng Fang,Yongsheng Yang,Weiyan Yin,Zehao Li
The development of rare earth adsorbents with high adsorption capacity, outstanding selectivity, and excellent reusability is important for the enrichment and recovery of rare earth elements. The adsorption of the rare earth ion Gd(III) by a phosphorylated polyacrylonitrile fiber was investigated. In this work, the adsorbent was synthesized by a simple and cost-effective grafting method using polyacrylonitrile (PAN) fibers as the substrates. The FTIR analysis, SEM, XPS, and TGA indicated the successful synthesis of polyacrylonitrile-phosphite (PAN-Phos) fibers. To evaluate the feasibility of PAN-Phos fibers as the potential adsorbents for Gd(III) removal, a series of adsorption experiments were conducted. The pseudo-second-order kinetic model better illustrated the adsorption of Gd(III) on PAN-Phos fibers, and equilibrium adsorption was achieved within 50 min; the maximum adsorption capacity was 120.9 mg·g–1. The PAN-Phos fibers also exhibited excellent reproducibility after four adsorption cycles. In addition, the results of various analyses indicated that the adsorption mechanism of Gd(III) on PAN-Phos fibers was mainly through the synergistic complexation of secondary amine and phosphoric acid groups. It provided a practicable way for the synthesis and preparation of rare earth adsorbent materials.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2015
·Vol. 5
·期 3
·1379-1396
·
IF 2.076
Li Zhang,Tingxian Liu,Yanan Xiao,Dexin Yu,Na Zhang
Molecular imaging is essential to increase the sensitivity and selectivity of cancer diagnosis especially at the early stage of tumors. Recently, polyionic nanocomplexes (PICs), which are composed of polyanions and opposite polycations, have been demonstrated to be a promising strategy for biomedical applications. In this work, chitosan-hyaluronic acid nanoparticles (GCHN) were developed to deliver Gd-DTPA as MRI contrast agents for tumor diagnosis. The Gd-labeled conjugates (CS-DTPA-Gd) were successfully synthesized by carbodiimide reaction, and then GCHN were prepared by ionic gelation using the obtained CS-DTPA-Gd and hyaluronic acid. The morphology of GCHN was spherical or ellipsoidal, which is observed by transmission electronic microscopy (TEM). The mean particle size and zeta potential of GCHN were 213.8 ± 2.6 nm and 19.92 ± 1.69 mV, respectively. The significant enhancement of signal intensity induced by GCHN was observed bothin vitroandin vivo. Also, compared with Magnevist, GCHN was witnessed for a prolonged imaging time in the B16 tumor-bearing mice model. Furthermore, GCHN were verified as below toxic bothin vitroandin vivo. These results indicated that GCHN could potentially be an alternative to current MRI contrast agents for tumor diagnosis.Keywords:tumor imaging;magnetic resonance imaging;hyaluronic acid;chitosan nanoparticles;Gd-DTPA
研究领域:
医学影像学
·
生物材料学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nuclear Materials and Energy
·
2020
·
IF 2.213
Xinyi Yang,Liangliang Song,Bo Chang,Qi Yang,Xiaodong Mao,Qunying Huang
The low solubility of gadolinium (Gd) limits its application in iron-based neutron shielding alloys. In this study, a high content of Gd up to 7.87 wt.% was added into 316L stainless steel by mechanical alloying (MA) of Gd 2 O 3 with 316L powder. Neutronics calculation results showed that the shielding efficiency of 0.2 mm thick 7.87 wt.% Gd-316L alloy was equivalent to that of 33 mm thick 316L for thermal neutrons. Microstructure analysis indicated that Gd-Si-O particles with an average size of 12.5 nm were uniformly dispersed in the matrix. It revealed that Gd 2 O 3 dissolved into the 316L matrix during MA and re-precipitated at around 780 °C as Gd 2 SiO 5 by XRD and TG-DSC. This study provides a novel Gd-containing alloy designed to achieve integration of structural alloys with good neutron shielding function for future application.
研究领域:
材料科学
·
核工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Qiang Gao,Jin-Feng Xie,Ya-Ting Shao,Chao Chen,Bo Han,Kai-Sheng Xia,Cheng-Gang Zhou
The development of rare earth adsorbent with high adsorption capacity and rapid adsorption rate is one of the most important issues for enriching and recovering rare earth ions. In the present work, an inorganic phosphorous acid-modified mesoporous SBA-15 (P-SBA-15) was facilely synthesized by a simple and cost-effective post-grafting approach, and its adsorption behavior towards the rare earth ion Gd(III) was investigated. Benefiting from high specific surface area (669.7 m 2 ·g −1 ), large pore size (9.1 nm), and the presence of abundant phosphorous acid groups (1.4 mmol·g −1 ) on the surface, the P-SBA-15 exhibited an excellent performance in terms of capacity and kinetics on adsorption of Gd(III). Under optimized conditions, the adsorption capacity of P-SBA-15 towards Gd(III) was up to 1.3 mmol·g −1 at 30 °C, which is the second highest value as compared with previously reported Gd(III) adsorbents. Moreover, the adsorption of Gd(III) onto P-SBA-15 was ultrafast, achieving adsorption equilibrium within only 2 min. Test of reusability revealed that this mesoporous adsorbent could be repeatedly used several times without significant loss in binding capacity. This work not only provides a new insight into the fabrication of phosphorous acid-functionalized mesoporous silica, but also demonstrates its prospective application in adsorptive removal and/or recovery of rare earth ions.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）