RARE METALS
·
2012
·Vol. 31
·期 5
·512-516
·
IF 0.593
Lian Yuanpei,Zhen Wei,Tai Zhigang,Yang Yaling,Song Jun,Li Zonghao
Cloud point extraction (CPE) with Tergitol TMN-6 was applied for the extraction of trace amounts of palladium (Pd(II)), platinum (Pt(IV)), and gold (Au(III)) in the soil of industrial sewage. Ammonium pyrolysine dithiocarbamate (APDC) was adopted as the chelating agent prior to CPE and then was detected by atomic absorption spectrometry (AAS). Different parameters such as the concentration of surfactants, chelating agent and salt, sample pH, equilibration temperature and time, centrifugation time and rates, and the effect of foreign ions were studied. Under optimum conditions, the low limits of detections are 1.4, 2.8 and 1.2 ng·ml −1 and the enrichment factors are 21, 12, and 24 for Pd(II), Pt(IV), and Au(III), respectively. The relative standard deviations vary from 0.6% to 1.0% ( n =11). All correlation coefficients of the calibration curves are >0.9960. The proposed method was successfully applied for the determination of Pd(II), Pt(IV), and Au(III) in the real soil of industrial sewage samples.
研究领域:
分析化学
·
环境化学
·
重金属检测
·
分离科学
·
环境监测
✓ 已验证
DOI
高影响因子
RARE METALS
·
2017
·Vol. 37
·期 4
·343-350
·
IF 1.189
Qin Bing-Chao,Xiao Yu,Zhou Yi-Ming,Zhao Li-Dong
IV–VI compounds are considered as promising thermoelectric materials, and high thermoelectric performance was achieved in IV–VI solid solutions. In this work, the thermoelectric properties of Pb–Sn–Te–Se-based solid solutions were systematically investigated. Among these solid solutions, it is found that a figure of merit ( ZT ) peak value of 1.0 at 873 K can be obtained in (PbTe) 0.5 (SnTe) 0.5 , on account of the combination of superior electrical properties in SnTe and low thermal conductivity in PbTe. Furthermore, we investigated and summarized the thermoelectric transport properties and proposed the thermoelectric performance maps for the IV–VI solid solutions in Pb–Sn–Te–Se system. This comprehensive investigation on Pb–Sn–Te–Se-based solid solutions can effectively guide and scan thermoelectric performance for a given unknown composition and enhance the thermoelectric properties in IV–VI compounds. Graphical
研究领域:
材料科学
·
凝聚态物理
·
功能材料
·
热电转换
·
半导体物理
✓ 已验证
DOI
高影响因子
RARE METALS
·
2012
·Vol. 31
·期 6
·599-603
·
IF 0.593
Li Yanhong,Lu Haiyan,Zhang Yongming,Ma Jing,Song Guoyi
Nanocrystalline Gd 3 Ga 5 O 12 :Eu 3+ with cubic phase was prepared by a urea homogeneous precipitation method. X-ray diffraction (XRD), field emission scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), thermo-gravimetric and differential thermal analysis (TG-DTA) and photoluminescence spectra were used to characterize the samples. The effects of the initial solution pH value and urea content on the structure of the sample were studied. The XRD results show that pure phase Gd 3 Ga 5 O 12 can be obtained at pH =6 and pH =8 of the initial solution. The average crystallite size can be calculated as in the range of 24∼33 nm. The average crystallite size decreases with increasing molar ratio of urea to metal ion. The results of excitation spectra and emission spectra show that the emission peaks are ascribed to 5 D 0 → 7 F J transitions of Eu 3+ , and the magnetic dipole transition originated from 5 D 0 → 7 F 1 of Eu 3+ is the strongest; the broad excitation bands belong to change transfer band of Eu-O and the host absorption of Gd 3 Ga 5 O 12 . An efficient energy transfer occurs from Gd 3+ to Eu 3+ .
研究领域:
材料科学
·
无机化学
·
发光材料
·
纳米材料
·
固态化学
✓ 已验证
DOI
高影响因子
RARE METALS
·
2023
·Vol. 43
·期 3
·1167-1176
·
IF 8.8
Wang Meng-Fei,Lai Hua-Jun,Liang Ji-Sheng,Chen Jun-Liang,Ding Wang-Yang,Zhou Qi,Peng Ying,Liu Cheng-Yan,Miao Lei
SiGe-based thermoelectric (TE) materials have gained increasing interests due to their low maintenance costs, environmental friendliness and long lifespan. However, the intrinsically high thermal conductivity of Si-based materials also results in poor TE properties. In this investigation, a zirconia (ZrO 2 ) composite strategy was applied to an n-type SiGe alloy, tremendously elevating its TE performance. After mechanical alloying and spark plasma sintering (SPS) processes, the ZrO 2 induced the formation of nanopores in the SiGe matrix via phosphorus adsorption. Moreover, such increase in porosity enhanced the phonon scattering and dramatically suppressed lattice thermal conductivity, from 2.83 to 1.59 W·m −1 ·K −1 at 873 K. Additionally, reduced phosphorus doping led to an increase in Seebeck coefficients and a relatively minor decrease in electrical conductivity. The power factor didn’t deteriorate significantly, either, as its maximum of ~ 3.43 mW·m −1 ·K −2 was achieved at 873 K with (Si 0.8 Ge 0.2 ) 0.097 P 0.03 (ZrO 2 ) 0.003 . In short, a peak figure of merit ( ZT ) of ~ 1.27 at 873 K and an average ZT ~ 0.7 from 323 to 873 K were obtained. This study demonstrates that the electrical and thermal transportation of SiGe material can be synergistically tuned by compositing ZrO 2 , illustrating a novel strategy to optimize the TE properties of bulk materials. Graphical abstract
研究领域:
材料科学
·
热电材料
·
凝聚态物理
·
无机非金属材料
·
功能材料
✓ 已验证
DOI
高影响因子
Nanoscale Research Letters
·
2018
·Vol. 13
·期 1
·1-8
·
IF 3.125
Zhang Zhiliang,Jin Hailun,Wu Chenyu,Ji Jianbing
Graphene, a two-dimensional nanomaterial, has shown tremendous promising applications in a broad range of fields. Mass production of defect-free graphene is a prerequisite for its applications. In this work, by using a needle valve, we propose a simple hydrodynamic-assisted exfoliation method to produce high-quality few-layer graphene flakes. The prepared graphene flakes, with an average layer of 5 (~ 71% less than five layers) and a Raman D/G intensity ratio as low as 0.1, are free of defects and oxidation. The average thickness and length of the few-layer graphene flakes are 2.3 nm (~ 90% < 4 nm) and 1.9 μm (~ 50% in the range of 1–7 μm), respectively. In a lab-scale trial, the concentration of graphene can reach 0.40 g/ml under mild operating conditions (working pressure 20 MPa, 16 cycles), and the corresponding production rate is 0.40 g/h. The hydrodynamic-assisted exfoliation by needle valve potentially offers a simple and efficient method for large-scale production of high-quality graphene.
研究领域:
纳米材料科学
·
材料化学
·
化学工程
·
二维材料
·
工业催化
✓ 已验证
DOI
高影响因子
Science China-Information Sciences
·
2019
·Vol. 62
·期 12
·1-8
·
IF 2.731
Wang Tao,Shi Xinyao,Wang Jin,Xu Yijun,Chen Jie,Dong Zhuo,Jiang Man,Ma Pengfei,Su Rongtao,Ma Yanxing,Wu Jian,Zhang Kai,Zhou Pu
Vanadium diselenide (VSe 2 ), a typical metallic behaviour material among transition metal dichalcogenides (TMDCs) family, exhibits excellent photoelectric characteristics with a zero band gap, missing applicaiotn in pulse generation. In this work, a high-quality VSe 2 saturable absorber (SA) was synthesized through a liquid-phase exfoliation method. The saturable absorption of obtained VSe 2 -SA was characterized systematically. The measured modulation depth was 9.9%, and the saturated intensity was 533.8 µJ/cm 2 . By incorporating this optical modulator into a ytterbium-doped fiber laser cavity, a stable passively Q-switched laser could be achieved. The pulse had the central wavelength of 1064.03 nm. As the pump power was increased, the repetition rate increased from 24.3 kHz to 35.6 kHz, and the pulse duration decreased from 7.21 µs to 5.27 µs. The output power had the maximum value of 28.55 mW. These results indicated that VSe 2 is an effective candidate to generate pulse laser due to its excellent nonlinear optical properties and universal photoelectric response, which may advance the applications of VSe 2 -based nonlinear optics and photoelectric devices.
研究领域:
光子学
·
凝聚态物理
·
纳米材料科学
·
非线性光学
·
激光技术
·
二维材料
·
光电功能材料
✓ 已验证
DOI
高影响因子
Science China-Technological Sciences
·
2023
·Vol. 66
·期 8
·2213-2224
·
IF 4.6
Li Qiang,Wu Chao,Peng YaJun,Zhang BingJian
Developing advanced cleaning systems for the removal of unwanted layers from painted surfaces is still a challenging issue that needs to be addressed in the field of cultural heritage. In this work, we proposed the use of novel polyelectrolyte hydrogels prepared via free radical polymerization and freeze-thaw methods. Zwitterionic sulfobetaine methacrylate (SBMA) was cross-linked with methylacryloyloxyethyl trimethylammonium (DMC) through covalent bonding to yield zwitterionic polyelectrolyte poly(SBMA- co -DMC) (PSD). Introducing PSD into the polyvinyl alcohol/carboxymethyl chitosan (PVA/CMC) hydrogel network enhanced the intermolecular electrostatic interactions and changed the porous structure and swelling behaviors, thus leading to improved mechanical properties. The adsorption ability of the PVA/CMC/PSD polyelectrolyte hydrogels toward dyes (rhodamine B and congo red) and metal ions (Cu 2+ and K + ) varied with increasing amounts of PSD, which could be attributed to cationic PSD tuning the net charges in the hydrogel. The cleaning effectiveness of the PVA/CMC/PSD polyelectrolyte hydrogels was assessed on wall painting mock-ups coated with soil, red paint, and soluble salts, using microscopic and spectroscopic analyses. The results showed that the hydrogel adhered to rough surfaces and removed unwanted substances effectively without leaving determinable residues, providing a possible safe and efficient method for the cleaning of important artifacts.
研究领域:
文化遗产保护
·
材料科学
·
高分子化学
·
分析化学
·
表面清洁
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOBIOTECHNOLOGY
·
2023
·Vol. 21
·期 1
·1-19
·
IF 10.2
Chen Bing,Zheng Kaifan,Fang Shubin,Huang Kangping,Chu Chengchao,Zhuang Junyang,Lin Jin,Li Shaoguang,Yao Hong,Liu Ailin,Liu Gang,Lin Jizhen,Lin Xinhua
Background The combination of drug delivery with immune checkpoint targeting has been extensively studied in cancer therapy. However, the clinical benefit for patients from this strategy is still limited. B7 homolog 3 protein (B7-H3), also known as CD276 (B7-H3/CD276), is a promising therapeutic target for anti-cancer treatment. It is widely overexpressed on the surface of malignant cells and tumor vasculature, and its overexpression is associated with poor prognosis. Herein, we report B7H3 targeting doxorubicin (Dox)-conjugated gold nanocages (B7H3/Dox@GNCs) with pH-responsive drug release as a selective, precise, and synergistic chemotherapy-photothermal therapy agent against non-small-cell lung cancer (NSCLC). Results In vitro, B7H3/Dox@GNCs exhibited a responsive release of Dox in the tumor acidic microenvironment. We also demonstrated enhanced intracellular uptake, induced cell cycle arrest, and increased apoptosis in B7H3 overexpressing NSCLC cells. In xenograft tumor models, B7H3/Dox@GNCs exhibited tumor tissue targeting and sustained drug release in response to the acidic environment. Wherein they synchronously destroyed B7H3 positive tumor cells, tumor-associated vasculature, and stromal fibroblasts. Conclusion This study presents a dual-compartment targeted B7H3 multifunctional gold conjugate system that can precisely control Dox exposure in a spatio-temporal manner without evident toxicity and suggests a general strategy for synergistic therapy against NSCLC.
研究领域:
癌症治疗
·
纳米医学
·
药物递送系统
·
免疫学
·
生物偶联化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2023
·Vol. 30
·期 5
·1753-1761
·
IF 2.6
Zhao Wenpu,Ji Yuecheng,Pang Yifan,Li Xiaolei,Ji Huiming
Al 2 O 3 -SiO 2 aerogel (ASA) was prepared by convenient ambient pressure drying using inexpensive AlCl 3 ·H 2 O as precursor, and silicon was deposited during the aging of aluminum gel. To explore the influence of Chloride ion on the property of ASA, ion exchange technology was used to remove the Chloride ion in the aluminum sol. ASA exhibits a low thermal conductivity of 0.029 W m −1 K −1 at room temperature, and the specific surface area of Cl-free ASA after heat-treated at 1200 °C is 95.2 m 2 /g, which is higher than that of the chlorine-containing aerogel (11.4 m 2 /g), showing enhanced thermal stability of ASA. Analysis of XRD and XPS indicate that the removal of chloride ions makes it more difficult for ASA to establish Al–O–Si groups during the aging process, so the γ-Al 2 O 3 and cristobalite phase do not transform to mullite phase at 1200 °C. Due to the better thermal stability of ASA, it has great potential for high-temperature applications in the fields of insulation, thermal protection materials, and building external wall thermal insulation.
研究领域:
材料科学
·
纳米技术
·
热工工程
✓ 已验证
DOI
高影响因子
Nano Research
·
2024
·Vol. 17
·期 6
·5168-5178
·
IF 9.5
Liu Yu,Xie Dehui,Shi Yuxin,Lv Rongguan,Chang Yingna,Sun Yuzhen,Zhao Zhiyuan,Wang Jindi,Song Kefan,Wu Huayu,Hoang Tuan K. A.,Xing Rong,Pang Huan
Aqueous rechargeable batteries (ARBs) are generally safer than non-aqueous analogues, they are also less-expensive, and more friendly to the environment. However, the inherent disadvantage of the narrow electrochemical window of H 2 O seriously restricts the energy density and output voltage of ARBs, especially aqueous rechargeable Fe-based batteries. Herein, we introduce a new battery system: the anode contains C@Fe/Fe 2 O 3 composite, which is interfaced with an alkaline electrolyte; the cathode contains LiMn 2 O 4 in contact with a neutral electrolyte. A Li + -conducting membrane is carefully selected to decouple the electrode-electrolyte, which effectively widens the electrochemical window to above 2.65 V, thereby enables an aqueous rechargeable iron battery. Its average output voltage is 1.83 V and its energy density is 235.3 Wh/kg at 549 W/kg. In this work, we propose the energy storage mechanism with the aid of density functional theory (DFT). The calculated reduction potential of the anode agrees with the experimental value. Furthermore, this battery system demonstrates long cycle lifespan of approximately 2500 cycles at 2 A/g, corresponding to a capacity retention of 82.1%. These results are very far superior than those of mainstream aqueous rechargeable Fe-based batteries, which guarantee future investigation for storing electricity energy.
研究领域:
储能
·
电化学
·
材料科学
·
电池技术
✓ 已验证
DOI
高影响因子
BMC Chemistry
·
2023
·Vol. 17
·期 1
·1-14
·
IF 4.6
Wei Jia,Yan Luchun,Zhang Zhifang,Hu Bing,Gui Wenjun,Cui Yanjun
Acid red 73 is an azo dye, and its residue can pollute the environment and seriously threaten human health and life. In this study, glutaraldehyde was used as the crosslinking agent, chitosan and polyvinyl alcohol were crosslinked under appropriate conditions to obtain a chitosan hydrogel film, and carbon nanotubes were dispersed in the chitosan hydrogel film. The FTIR, XRD, BET, SEM were applied to chatacterize the structure and the morphology of the absorbent and results showed that when the mass fraction of the carbon nanotubes was 1%, the structure was a three-dimensional network with microporous, and the water absorption reached to the maximum value of 266.07% and the elongation at break reached to a maximum of 98.87%. The ability to remove acid red 73 from aqueous and soil environments was evaluated by UV. In the aqueous samples, 70 mg of the adsorbent reached a saturated adsorption capacity of 101.07 mg/g and a removal rate of 92.23% at pH = 5. The thermodynamics conformed with the Langmuir adsorption isotherm and pseudo second-order adsorption kinetic models. In the soil samples, 100 mg of the adsorbent reached an adsorption capacity of 24.73 mg/g and removal rate of 49.45%. When the pH of the soil is between 4 and 7, the removal rate and adsorption capacity do not change much; hence, the pH should be maintained between 5.2 and 6.8, which is extremely suitable for the growth of general plants. Moreover, the experimental results demonstrated that the adsorbent maintained a good removal rate of acid red 73 over six adsorption cycles. Graphical
研究领域:
环境科学
·
材料科学
·
化学工程
·
水处理
·
土壤修复
·
高分子科学
·
分析化学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 10
·28227-28237
·
IF 5.19
Liu Huan-Huan,Yang Lei,Guo Lin-Kai,Tu Li-Xin,Li Xiao-Tong,Wang Jia,Ren Yong-Xiang
The occurrence of metal oxide nanoparticles (NPs) in wastewater treatment plants (WWTPs) has raised great concerns about their adverse impacts on nitrification performance. In this study, a heterotrophic nitrifying bacterium Pseudomonas putida strain NP5 showed strong resistance against TiO 2 and NiO NPs. Under 5–50 mg/L NP stress, cell viability was still normal, and the final nutrient removal rates, always higher than 80%, were slightly inhibited. Correspondingly, the PO 4 3− -P removal rates were almost the same as those observed in the control test. Although the enzyme assay demonstrated ammonia monooxygenase and hydroxylamine oxidoreductase activities markedly decreased caused by increased reactive oxygen species (ROS) level under 50 mg/L NPs stress. The total antioxidant capability of NP5 could eliminate excess ROS to maintain a balance between oxidants and antioxidants. Besides, in response to the escalating burden of NPs, strain NP5 tended to secrete more extracellular polymeric substances (EPS), which could protect cell from being damaged by binding to ions and coating. Thus, the strong NP resistance of NP5 would help to overcome the vulnerability of the nitrification process in WWTPs.
研究领域:
环境微生物学
·
纳米毒理学
·
污水处理
·
微生物生理学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）