Materials Today Communications
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2020
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IF 2.678
Xueyan Liu,Lingxiao Li,An Chen,Chengyou Kan,Jianhong Xu
A polymerizable rhodamine-based monomer 2-(3-(2-(3′,6′-bis(diethylamino)-3-oxospiro[isoindoline-1,9′-xanthen]-2-yl)ethyl)ureido)ethyl acrylate (RhBUEA) is first designed and synthesized, and then used in the preparation of a new water-soluble P(AM-co-RhBUEA) through precipitation polymerization of it with acrylamide (AM). Influence of the RhBUEA content on the polymerization process is investigated, and the chemical structure and composition of the copolymers are confirmed by FTIR and UV–vis spectral analysis. According to the off-on switch between spirolactam and ring-opened form of rhodamine derivative, P(AM- co -RhBUEA) prepared with 15 wt.% RhBUEA exhibits a highly sensitive and selective recognition towards Fe 3+ in aqueous solution with 0.073 μM of detection limit, accompanied with a remarkable spectral and color change. Furthermore, the spectral response is reversible by the alternating addition of Fe 3+ and EDTA to the copolymer, and the test strips prepared by P(AM-co-RhBUEA) can detect Fe 3+ colorimetrically and portably, which makes the water-soluble polymer a promising Fe 3+ sensor in the field of on-site detection.
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高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Junxiao Tang,Wei Ji,Jingjing Xie,Yunwei Shi,Yuexu Zhu,Qianglong He,Weimin Wang
In this study, B 6.5 C-TiB 2 -SiC-BN composite was fabricated via reactive hot pressing from a powder mixture of TiCN, B, and Si. The reaction process of the powder mixture was investigated by heat treatment at elevated temperatures. The as-reacted powder products possessed a core-shell structure of TiB 2 surrounded by h-BN. During densification, the h-BN in this structure acts as a diffusion channel and lubricant, which promoted the densification process. The extremely small size, fresh surface of in-situ formed phases, and uniform dispersion in synthesized powders also contributed to sintering. The designed reactive hot-pressing sintering effectively resolves the difficulty of obtaining uniformly-dispersed BN. The obtained bulk B 6.5 C-TiB 2 -SiC-BN composite ceramic shows high relative density (98.8%) and good comprehensive mechanical properties including hardness, bending strength , and fracture toughness of 19.6 GPa, 801 MPa, and 5.31 MPa m 1/2 , respectively.
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ACS Sustainable Chemistry & Engineering
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2020
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IF 7.632
Yumei Qin,Zhaoyang Ding,Wenwei Guo,Xiaolu Guo,Cheng Hou,Bang-Ping Jiang,Chun-Guang Liu,Xing-Can Shen
The utilization of diffusive solar energy through photocatalytic processes has received tremendous attention. Herein, a full-solar-spectrum photocatalyst with strong near-infrared (NIR) photoactivity, which is based on the synergy of oxygen vacancies (OVs) and doped boron that is cointegrated into zirconia (B@ZrO2–OV), is designed in this work. The doped photocatalyst is prepared via a controlled one-step NaBH4 reduction from white ZrO2. Density functional theory (DFT) calculations reveal that simultaneously introduced OVs and boron dopants on ZrO2 induced a narrow band gap (4.78 eV) and achieved charge separation (work function of 4.12 eV), thus confirming its excellent photocatalytic activity in the degradation of rhodamine B under NIR irradiation. In contrast, oxygen-deficient ZrO2 and white ZrO2 were inactive under NIR light. Therefore, this synergistic strategy provides an efficient way to use the narrow band gap of a classic semiconductor zirconia as a highly efficient catalyst for full-solar-spectrum-driven photocatalysis.
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高影响因子
World Journal of Stem Cells
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2020
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IF 3.231
Jun-Hao Lei,Wen Yan,Chun-Hua Luo,Yu-Ming Guo,Yang-Yang Zhang,Xing-Huan Wang,Xin-Jun Su
BACKGROUND With continuous advancement of industrial society, environmental pollution has become more and more serious. There has been an increase in infertility caused by environmental factors. Nonylphenol (NP) is a stable degradation product widely used in daily life and production and has been proven to affect male fertility. However, the underlying mechanisms therein are unclear. Thus, it is necessary to study the effect and mechanism of NP on spermatogonial stem cells (SSCs). AIM To investigate the cytotoxic effect of NP on SSCs via the phosphatidylinositol-3-kinase/protein kinase B/mammalian target of rapamycin (PI3K/AKT/mTOR) pathway. METHODS SSCs were treated with NP at 0, 10, 20 or 30 µmol. MTT assay was performed to evaluate the effect of NP on the proliferation of SSCs. Flow cytometry was conducted to measure SSC apoptosis. The expression of Bad, Bcl-2, cytochrome-c, pro-Caspase 9, SOX-2, OCT-4, Nanog, Nanos3, Stra8, Scp3, GFRα1, CD90, VASA, Nanos2, KIT, PLZF and PI3K/AKT/mTOR-related proteins was observed by western blot, and the mRNA expression of SOX-2, OCT-4 and Nanog was detected by quantitative reverse transcription polymerase chain reaction. RESULTS Compared with untreated cells (0 μmol NP), SSCs treated with NP at all concentrations showed a decrease in cell proliferation and expression of Bcl-2, Nanog, OCT-4, SOX-2, Nanos3, Stra8, Scp3, GFRα1, CD90, VASA, Nanos2, KIT, and PLZF ( P < 0.05), whereas the expression of Bad, cytochrome-c, and pro-Caspase 9 increased significantly ( P < 0.05). We further examined the PI3K/AKT/mTOR pathway and found that the phosphorylation of PI3K, AKT, mTORC1, and S6K was significantly decreased by NP at all concentrations compared to that in untreated SSCs ( P < 0.05). NP exerted the greatest effect at 30 μmol among all NP concentrations. CONCLUSION NP attenuated the proliferation, differentiation and stemness maintenance of SSCs while promoting apoptosis and oxidative stress. The associated mechanism may be related to the PI3K/AKT/mTOR pathway.
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PubMed
高影响因子
CARBOHYDRATE POLYMERS
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2020
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IF 7.182
Yihua Yin,Mengdan Yang,Jing Xi,Weiquan Cai,Ying Yi,Guanghua He,Yue Dai,Ting Zhou,Mengqing Jiang
To improve in vitro photostability and enhance insecticidal activity, a novel esterase/glutathione (GSH) responsive photoactivated nano-pesticide delivery system was synthesized by conjugation of photoactivated pesticide phloxine B(PB) to sodium alginate (SA) via esterase/GSH sensitive phenolic ester bond followed by ultrasonic dispersion. The system was stable in PBS (pH 7.4) and could protect effectively the conjugated PB from in vitro photodegradation because of aggregation-caused quenching effect, whose maximum photodegradation rate did not exceed 10 % after 270 min illumination. However, upon exposure to esterase-6 or GSH stimulus, high photoactivity was observed due to the destruction of the system and accompanied by PB release. The combined stimulation could trigger more PB release than any single stimulus and thus resulting in a higher photoactivity. Compared with free PB, The system showed a higher phototoxicity on Sf9 insect cells and the in vitro light exposure had little influence on the phototoxicity.
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PubMed
高影响因子
MACROMOLECULES
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2020
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IF 5.918
Rui Qi,Yulin Zhu,Liang Han,Meijing Wang,Feng He
Fabrication of two-dimensional (2D) nanomaterials by conjugated polymers attracts increasing interest on account of their potential applications in optoelectronic devices. Precise control over the shape and size of the 2D nanostructures, however, is still challenging. We have developed a series of 2D rectangular micelles by hierarchical self-assembly of poly(3-hexylthiophene) (P3HT)-b-poly(ethylene glycol) (PEG) in i-PrOH. The aspect ratios and the sizes of the 2D rectangular micelles are controlled by the ratios of P3HT and PEG blocks, and the sizes of these 2D micelles are strongly concentration-dependent. Large and complex assembled architectures can be obtained in highly concentrated solutions. It is found that the block copolymers first assemble into fibers and then reorganize into 2D rectangular micelles with π–π interactions playing a key role in the formation of the 2D micelles. This offers a new method to prepare 2D nanostructures with controllable shapes and sizes for organic electronic devices.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Yang Zhao,Hui-Long Wang,Hui-Ping Qi,De-Ying Zhao,Xin-Kui Wang
Based on the superior photocatalytic activity of low crystalline BiOCl (LCB) and temperature responsive character of poly( N -isopropylacrylamide) (PNIPAM), the novel BiOCl/GO@PNIPAM photocatalyst (PGOB) was successfully synthesized in this work by employing LCB as a photocatalytic core material, graphene oxide (GO) as a carrier for LCB, and PNIPAM as a thermo-sensitive shell material of the photocatalyst. Compared with the high crystalline BiOCl nanoplates (NPB), the core material LCB in PGOB exhibited superior photocatalytic activity and could be prepared simply by a mannitol complexation-assisted method under ambient conditions without any post-treatment. The interactions between mannitol and bismuth caused changes in chemical environment of bismuth in LCB. The morphology, crystallization, structure features and chemical compositions of the as-prepared samples were investigated by various techniques. The results showed that the prepared PGOB sample exhibited good temperature-responsive performance, excellent adsorption capacity and superior photocatalytic activities, the higher activity of which could be attributed to the effective separation and longer survival of the photogenerated carriers.
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高影响因子
APPLIED SURFACE SCIENCE
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2019
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IF 5.155
Yong Zhang,Keding Li,Jun Liao
The multifunctional reduced-graphene-oxide/rare-earth-metal-oxide (RGO/REMO) aerogels with three-dimensional (3D) interconnected networks were fabricated through a facile one-step hydrothermal method and freeze-drying process. It was proved that REMO nanoparticles could be easily deposited on graphene sheets in gentle conditions. To further investigate the effect of REMO on the adsorption of dyes, RGO/Nd 2 O 3 , RGO/Pr 2 O 3 and RGO/Ce 2 O 3 aerogels were used to adsorb the Rhodamine-B (RhB). The RGO/REMO aerogels all exhibited high adsorption capacity for RhB and the maximal adsorption capacity was as high as 243.4 mg·g −1 . In particular, RGO/Ce 2 O 3 aerogel had a significant adsorption efficiency for RhB, and the adsorption capacity of RGO/Ce 2 O 3 aerogel for RhB reached 130.1 mg·g −1 only in one hour. Furthermore, as for RGO/Ce 2 O 3 aerogel, the removal-rate of RhB was still more than 92% after nine repeated regeneration. The excellent adsorption capacity and high repeated utilization rate of RGO/REMO aerogels indicated that the composite adsorbent possessed potential practical application in the treatment of wastewater containing RhB.
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高影响因子
JOURNAL OF AOAC INTERNATIONAL
·
2019
·Vol. 99
·期 3
·760-765
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IF 1.201
Zhang Jing,Zhang Liu,Wang Wenchang,Chen Zhidong
A sensitive and convenient electrochemical method was developed for the determination of rhodamine B by a silica-pillared zirconium phosphate/nafion composite (SPZP/NAF) modified glassy carbon electrode. The SPZP was characterized with scanning electron microscopy and X-ray diffraction. Because of the layer structure and large specific surface area of SPZP, the SPZP/NAF modified glassy carbon electrode showed high electrocatalytic activity toward the oxidation of rhodamine B. Under optimal experimental conditions, the SPZP/NAF modified electrode exhibited a wide linear response to rhodamine B ranging from 0.01 to 5.0 μM and a low detection limit down to 4.3 nM (S/N = 3). This method showed good accuracy, acceptable precision, and reproducibility. This electrode had been applied in the determination of rhodamine B in preserved fruit and chili powder samples. The proposed method provided a useful tool for the assay of rhodamine B in food samples.
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高影响因子
CERAMICS INTERNATIONAL
·
2023
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IF 5.2
Xiaoyu Pan,Bin Meng,Qingqing Yang,Xinyu Ping,Congcong Fang,Zhiyuan Ma
In order to further improve their dielectric properties of BaTiO 3 -based high-entropy ceramics, three groups of perovskite-structured high-entropy dielectric ceramics with compositions of (Ca 1/3 Sr 1/3 Ba 1/3 )(Ti 1/3 X 1/3 Y 1/3 )O 3 (X and Y chosen from Zr, Hf, and Sn) were fabricated by solid state reaction method and then fast hot-pressing sintering (FHPS) at 1300 °C and 50 MPa. All three groups of samples possess a single-phase perovskite structure with an average grain size of 160–727 nm and a uniform elemental distribution. Among the three groups of samples, (Ca 1/3 Sr 1/3 Ba 1/3 )(Ti 1/3 Sn 1/3 Hf 1/3 )O 3 exhibits the highest dielectric constant of 11,037 at the Curie temperature of 588 °C, while (Ca 1/3 Sr 1/3 Ba 1/3 )(Ti 1/3 Zr 1/3 Hf 1/3 )O 3 shows the highest discharge energy storage density ( W d = 0.702 J/cm 3 ) and the critical electric field ( CEF = 389 kV/cm) corresponding to the saturation polarization intensity. The CEF and energy storage performance of the three samples are significantly higher than those of BaTiO 3 ( W d = 0.08 J/cm 3 , η = 46.09%, CEF = 30 kV/cm) and other reported BaTiO 3 -based high-entropy ceramics.
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高影响因子
EUROPEAN POLYMER JOURNAL
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2023
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IF 6
Jiayi Wang,Yicen Ge,Yue Wang,Rui Sun,Xiao Yang,Haodan Xue,Xiaoyan Ma,Jinyu Liu,Keling Hu
Pd nanoparticles (NPs) supported by micelles formed with poly(2-(dimethylamino)ethyl methacrylate)- b -poly(lauryl methacrylate) (Pd/PDMAEMA- b -PLMA) were prepared and employed as catalyst in the Suzuki-Miyaura cross-coupling reaction of aryl bromides with arylboronic acids in water. Most reactions proceeded with high efficiency at room temperature with only 0.05 mol% Pd loading in the absence of ligands, which afforded the desired functionalized biaryls in 73–98 % yields after 24 h. After reaction, Pd/PDMAEMA- b -PLMA retained in the aqueous phase was easily separated from the insoluble biaryl product and could be further reused two times without significant loss in catalytic efficiency. Characterization of the catalyst disclosed that sub-2 nm Pd NPs were embedded in the hydrophilic corona of polymeric micelles that served as nanoreactors in water.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2023
·Vol. 34
·期 34
·1-10
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IF 2.8
Huang Chu,Meng Yingzhi,Li Chenlin,Wang Dawei,Chen Xue,Sun Lixian,Peng Biaolin,Lei Xiuyun,Shen Yufang,Liu Laijun
High-performance colossal permittivity ( ε′ > 10 4 ) plays an indispensable role in the development of electronic field. In this work, ultra-high dielectric permittivity ( ε′ > 237, 294 @1 kHz) and low dielectric loss (0.012 @1 kHz) were simultaneously achieved in Ta-doped BaTi 0.995 Ta 0.005 O 3 ceramics. Importantly, the dielectric permittivity changes less than 15% between − 55 and 200 °C, and the dielectric loss is less than 0.04. The excellent giant dielectric performance is related to the defect dipoles of electronic pins associated with electrons/oxygen vacancies/Ti 3+ , which are generated by B-site donor. And the thermal-activated short-range hopping of electrons is conformed to be the origin of low dielectric losses and excellent thermal stability. This work provides a strategy for achieving ultra-high dielectric permittivity, low dielectric loss, and excellent temperature stability of Ta-doped BaTiO 3 simultaneously through B-site defect engineering.
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