JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 10
·1-8
·
IF 2.8
Pang Hongyu,Yin Bing,Liu Xiaobo,Jiang Tingting,Wu Shuo
Reactive oxygen species (ROS) and dopamine (DA) can serve as two important biomarkers in the diagnosis of Parkinson’s disease (PD). Due to the close relationship between DA and hydrogen peroxide (H 2 O 2 ) in the process of PD occurrence and development, the simultaneous detection of DA and H 2 O 2 is of great significance for the diagnosis and treatment of PD. In this paper, we report a high integrated bifunctional microelectrode array (MEA) for the simultaneous detection of DA and H 2 O 2 . The sensing electrodes were selectively modified with PEDOT film and Pt-black/PEDOT by electrochemical deposition for detecting DA (with a sensitivity of 38.1 nA/μM/mm 2 ) and H 2 O 2 (with a sensitivity of 45.2 nA/μM/mm 2 ), respectively. The MEA exhibited good sensitivity, selectivity and was capable of sensing both DA and H 2 O 2 simultaneously in serum without any crosstalk. This work proved the feasible of utilizing MEA for multicomponent analysis and showed great potential of MEA for in vitro analysis as well as early diagnosis of PD.
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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 13
·5773-5787
·
IF 4.5
Qi Cheng,Wang Wen-Han,Zheng Jin-Fan,Jiang Li-Wen,Meng Chao,Liu Hong,Wang Jian-Jun
The recent advancement of nanocatalysis offers great promise for cancer therapy, and the development of efficient nanozymes for catalytic biological reactions is highly desirable, but still challenging. Herein, we report the synthesis of ultra-small FeO x nanozymes which is enabled by the introduction of Cu 2+ . The obtained nanozymes exhibit versatile catalytic activities integratively for effective cancer treatment. In particular, the as-synthesized nanozymes display pH-dependent peroxidase (POD)-like catalytic activity and approach the optimal performance at around pH = 4, endowing it with the possibility for the precise treatment of tumors with acidic microenvironment. Furthermore, the FeO x nanozyme possesses a promising glutathione (GSH) depleting capability and allows to reverse the abnormal GSH level in the tumor issues. Additionally, the fabricated nanozymes are able to catalyze the decomposition of hydrogen peroxide (H 2 O 2 ) to O 2 , allowing to alleviate the hypoxic environment of the tumors and improving the function of immune system for the treatment of tumors. More importantly, the FeO x nanozymes showed remarkable stability and maintained the enzymatic activity after six months in storage. Collectively, the FeO x nanozyme was demonstrated as a promisingly effective nanomedicine for tumor treatment by 4T1 cells, providing insight into the rational design of efficient nanozymes for cancer treatment. Graphical abstract
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CHEMICAL PAPERS
·
2023
·Vol. 77
·期 8
·4633-4642
·
IF 2.2
Li Rongfa
Animated displays and fluorescent devices are researched for fashion media. In this work, perovskite nanocrystals (PNCs)/copolymer composite with high luminescent intensity and stability was prepared. Two composites bearing PNCs (various polymer matrices) were fabricated via drop-coating method. Micro-/nano-structure, crystallization, and light absorption/photoluminescence (PL) traits of PNCs were characterized. PNCs/poly(methyl methacrylate- co -butyl acrylate) (PMMA- co -PBA) composite shows a better film-forming property than PNCs/polymethyl methacrylate (PMMA) composite. PL-emission properties of PNCs/copolymer composite are comparable to PNCs, including the maintained emission wavelength (~ 521 nm) and narrow emission half-peak width. For high fluorescent stability after air/ultraviolet aging, PNCs/copolymer composite is superior to PNCs and PNCs/homopolymer composite. PNCs/copolymer composite shows a PL intensity of ~ 90% after air aging for 40 days (~ 80% after ultraviolet aging for 120 h). Luminescent film devices via PNCs/copolymer composite were studied, and effective green-/white-light emissions were achieved. The present white-light emission is close to the international standard. This work might enable a large-scale preparation of quantum dots/polymer composites for luminescent devices.
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Electronic Materials Letters
·
2023
·Vol. 19
·期 6
·554-563
·
IF 2.4
Wang Yi,Wang Kai,Hu Jiajun,Si Kang,Xia Hongyan
Thermal interface materials with high thermal conductivity are the best choice to solve the current overheating problem of electronic devices, and the choice of thermal conductive filler is a key factor affecting the performance of thermal interface composites. Hexagonal boron nitride sheet is considered to be ideal thermal conductive filler, but the thermal conductive effect of single filler is still insufficient to meet actual needs. Here, a new type of hybrid filler mixed with boron nitride sheet and boron phosphide particles is used to prepare epoxy based composites. When the filler volume fraction is 40%, the thermal conductivity of composites reaches 3.18 W m −1 K −1 . Under the same content, the thermal conductivity of the composites with mixed fillers outperforms those with boron nitride sheet alone. At the same time, the composite material shows high breakdown strength of 46 kV mm −1 . This work provides a new way to prepare thermal interface materials with high thermal conductivity for modern electronic packaging. Graphical Abstract
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RARE METALS
·
2023
·Vol. 42
·期 5
·1614-1623
·
IF 8.8
Liu Shu-Ran,Luo Shu-Ting,Wu Xiao-Dong,Wang Tao-Jin,Ran Rui,Weng Duan,Si Zhi-Chun,Liu Shuang
In this work, silica-alumina mixed oxides with different SiO 2 contents (5% and 30%) were adopted as acidic supports for platinum catalysts for soot oxidation. The obtained catalysts were hydrothermally aged in 10% H 2 O/air at 750 °C for 20 h. The catalysts were characterized by X-ray diffraction (XRD), N 2 adsorption, inductively coupled plasma (ICP), CO chemisorption, NH 3 temperature-programmed desorption (TPD), infrared (IR) spectroscopy of CO adsorption, temperature-programmed oxidation (TPO) of NO, and TPD of NO x . The surface acidity of catalyst was positive correlated with the content of SiO 2 , which kept platinum in metallic and partially oxidized states in an oxidizing atmosphere. Compared with sulfation treatment on the alumina support, the application of SiO 2 –Al 2 O 3 mixed oxides does not result in the coverage of Pt active sites and the prepared catalysts exhibit excellent activity for NO oxidation. They promote NO x preferential adsorption on soot and decomposition of surface oxygenated compounds (SOCs) as the sulfated Pt/Al 2 O 3 catalyst does. Graphical abstract
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ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2023
·Vol. 84
·期 3
·413-425
·
IF 4
Wang Zhuang,Yu Le,Wang De-Gao
Advanced nanomaterials can be released into the environment and can coexist with natural organic matter (NOM). However, evidence on the impacts of NOM on the environmental behavior and toxicity of advanced nanomaterials is still scarce. Here, we investigated the behavior and toxic effects of two layered double hydroxides (LDHs) nanomaterials with different metallic constituents (Mg-Al-LDH and Zn-Al-LDH) at relatively low exposure concentrations on a freshwater green alga ( Chlorella pyrenoidosa ) in the absence and presence of two types of NOM, namely dissolved organic matter (DOM) and dealkaline lignin (DL). The DOM or DL interaction with the LDHs at different mixture levels was shown to be an antagonistic effect on the growth inhibition toxicity to C. pyrenoidosa mainly. The estimation of the index of Integrated Biological Responses version 2 indicated that the joint interaction of the LDHs with DOM or DL occurred in the following order of frequency synergism > antagonism > additivity. Furthermore, the physicochemical characteristics of LDHs were crucial for illuminating the mechanism by which the DOM or DL modified the LDH-induced oxidative stress response. These findings highlighted the important role of NOM in the behavior and effect of LDHs as a representative of a new class of multifunctional nanomaterials in the freshwater environment.
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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 8
·3687-3700
·
IF 4.5
Gu Siqi,Xie Ping,Hu Zuming,Yu Junrong,Wang Yan,Li Na
Because of excellent insulation properties and thermal stability, meta-aramid paper can be commonly applied to a vast number of fields, like power systems. But poriferous and relatively lax structure of meta-aramid paper would limit its applications in high-voltage environment. This paper proposes a sandwich structure design to combine PDA@BNNS/PMIA film and meta-aramid paper with high breakdown strength. After coating with 6 wt% PDA@BNNS/PMIA solution, this kind of paper became more compact, so there were few pores in the paper and it further enhanced the mechanical and dielectric performances of specimens. The tensile strength in the cross direction increased from 31.3 to 40.5 MPa, and the performance in the machine direction was from 75.5 to 78.9 MPa. Furthermore, the breakdown strength of compound-coated paper achieved 55 kV/mm, which is much higher than meta-aramid paper. Additionally, compound-coated paper still remained outstanding thermal stability. Overall, our fabricated PDA@BNNS/PMIA compound-coated paper has excellent comprehensive properties, which provides a broad prospect for the applications in high-temperature and high-voltage transformers.
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CATALYSIS LETTERS
·
2023
·
IF 2.8
Zhang Chao,Zhang Zhengping,Niu Jin,Li Zhilin,Wang Feng
Platinum catalysts with {111} surface has obvious advantages, but the control of {111} exposure usually requires surfactants which cover the surface and decrease the catalytic performance. In this paper, tetrahedral platinum nanoparticle catalysts were successfully prepared with a simple one-step hydrothermal method and their size were successfully controlled under sub-5 nm. The tetrahedral morphology was controlled through the decomposition of dimethylamine by DMF and the small size was determined by alcohol acid radical. Because of the profitable effect of the amines for the tetrahedral morphology, no surfactant was need during the preparation. The catalysis activity was assured by the tetrahedral morphology with Pt {111} exposure without the surfactant covering, and the small size further increased the number of activity sites. For HOR, the catalyst showed higher activity, stronger anti-CO poisoning performance and longer stability than those of commercial catalyst with the same platinum load. For ORR, the catalyst also showed better performances which further promoted the four-electron reaction. Our simple preparation method successfully achieved the aims of the morphology control, size control and the elimination of surfactant, which effectively assured the good catalyst performances. The simple preparation path of such good catalysts shows a great application potential. Graphical Abstract
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 14
·41910-41922
·
IF 5.8
Li Xue,Chen Huichao
The use of mechanochemistry for the remediation of hexachlorobenzene (HCB)-contaminated soil was investigated. Additives such as alkaline materials, neutral materials, natural minerals, and solid waste were studied to explore their effect on the degradation of hexachlorobenzene in soil with single or combined addition by mechanochemical method. The best combination of materials were determined based on HCB destruction percentage by considering the impact on soil quality, the treatment cost, and the availability of additives. Scanning electron microscope (SEM) images and X-ray photoelectron spectrometer (XPS) analysis were conducted for the mechanism studies. The combination of albite and ferric oxide (Fe 3 O 4 ) was found to achieve the best performance in the degradation of HCB with the destruction percentage from 74.3 to 92.5% after 2-h and 6-h reaction, respectively. The developed fracture structure and complex compositions of albite provided abundant reaction sites for mechanochemical degradation of HCB in soil.
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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 3
·1200-1213
·
IF 4.5
He Chunming,Yan Ru,Xue Qingwang,Li Shuxian,Wang Huaisheng
In this work, polyaniline (PANI) and overoxidized polyaniline (oPANI) nanorods doped by phytic acid (PA) with uniform size of 60–100 nm were prepared and modified on glassy carbon electrode (GCE) as non-enzymatic malathion sensors. Doping of PA has deep influence on structural and morphological properties, conductivity and detection performance of electrode materials. The obtained PANI nanorods doped with PA (PA-PANI) possess high affinity toward malathion, and thus the redox reaction of PANI molecules could be hindered and redox currents were inhibited. The electrode reaction process on PA-PANI/GCE is a typical adsorption-controlled process. By contrast, the oPANI nanorods doped with PA (PA-oPANI) presents good catalytic performance to malathion and the electron transfer process was enhanced and redox currents increased. Correspondingly, the electrochemical reduction process on PA-oPANI/GCE is a typical diffusion-controlled process. Both enzyme-free electrochemical sensors exhibit good stability, anti-interference ability, recovery in real samples and excellent detection performance, with a wide linear range of 0.01–200 ppb and low detection limit (1.58 ppt for PA-PANI and 2.23 ppt for PA-oPANI, respectively), indicating that PA-PANI and PA-oPANI could be used as an excellent malathion sensor. Moreover, the PA-oPANI sensor has some degree of reproducibility through further anodic polarity processing, and the detailed application needs to be further explored.
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GRAEFES ARCHIVE FOR CLINICAL AND EXPERIMENTAL OPHTHALMOLOGY
·
2022
·Vol. 261
·期 3
·723-734
·
IF 3.535
Zhou Jin,Ding Yuanyuan,Zhang Yongqiang,Zheng Dehui,Yan Lifeng,Guo Mengxiang,Mao Yani,Yang Lihong
Purpose This study was aimed at exploring the function of Exosomes isolated from bone marrow-derived mesenchymal stem cells (BMSC-Exos) in corneal wound healing and at revealing the underlying mechanisms involving the p44/42 mitogen-activated protein kinase (MAPK) pathway. Methods The isolated BMSC-Exos were identified by transmission electron microscopy, Western blot, and nanoparticle tracking analysis. After coculture with BMSC-Exos, the proliferation and migration of human corneal epithelial cells (HCEs) were evaluated. The protein expression of p-MEK/MEK and p44/42 MAPK was detected by Western blot. A mouse model of alkali-burned cornea was established via NaOH exposure. After injection with BMSC-Exos, the pathological changes and expression of α-SMA (a fibrosis marker) and CD31 (a vascularization marker) in corneal tissues were detected. Results BMSC-Exos enhanced the proliferation and migration of HCEs in a dose-dependent manner. The p44/42 MAPK pathway was activated by the treatment of BMSC-Exos, and its blocking using U0126 partially abrogated the effects of BMSC-Exos on promoting the proliferation and migration of HCEs. In vivo , the injection of BMSC-Exos facilitated the remission of the pathological changes (inflammation) and weakened the upregulation of α-SMA (fibrosis) and CD31 (vascularization) in corneal tissues of mice with alkali-burn injury. Conclusion BMSC-Exos promoted the proliferation and migration of HCEs via activating the p44/42 MAPK pathway in vitro and also inhibited alkali burn-induced inflammation, fibrosis, and vascularization in corneal tissues in vivo . BMSC-Exos may be promising resources for promoting corneal wound healing.
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BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2022
·Vol. 110
·期 1
·1-7
·
IF 2.807
Gu Xinfeng,Mo Huijing,Wang Lei,Zhang Lianyi,Ding Zhuhong
Transport of Cr(VI) at the presence of bentonite colloid was carried out in saturated porous media of 16–18 mesh and 40–60 mesh sand columns. Effects of flow rate, pH, ion strength, humic acid and bentonite concentrations on Cr(VI) migration were investigated. The results show that the increase of flow rate accelerated the breakthrough of Cr(VI) and BP, but the transport mass of dissolved Cr(VI) decreased by ~ 15.0% when flow rate increased to 2.5 ml min −1 . Increasing IS to 10mM resulted in decrease of Cr(VI) transport mass by 6.86%–21.4%. Increase of pH and decrease of bentonite concentration favored the transport of dissolved Cr(VI). Humic acid had little effect on transport amount of Cr at pH7. Cr(VI) transport was dominated by the dissolved Cr(VI). The transport data of dissolved Cr(VI) were well described by the two-site model. The presence of BP reduced total Cr(VI) transport mass in co-transport.
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