JOURNAL OF NANOPARTICLE RESEARCH
·
2019
·Vol. 21
·期 12
·1-11
·
IF 2.009
Wu Nengtao,Liu Xingyu,Zeng Min,Gao Jinwei,Lu Xubing,Zeng Zhi,Zheng Yuhui
Since Cu 2+ and Fe 3+ ions have been considered as bioactive cations in oxygen transport and enzymatic reactions, the development of reliable ways for the monitoring of the two species will be highly desirable. But the optical stability of conventional organic chromophores needs to be improved. Therefore, the employment of quantum dots (quantum dots are abbreviated to be QDs) such as ternary CuFeS 2 QDs for the purpose of sensing has been reported in this study. CuFeS 2 QDs were synthesized by using oleylamine as the stabilizer at 180 °C and the particle size was around 2–3 nm. The monodispersed quantum dots with tetragonal chalcopyrite crystalline structure were identified. The corresponding excitation and emission wavelengths of the QDs were monitored at 372 and 458 nm. Magnetic properties were analyzed via applied magnetic field ranging between −6000 and 6000 Oe at 300 K and the ferromagnetic phase was verified. In this report, CuFeS 2 QDs has been used as an optical probe to detect the metal ions with high sensitivity, selectivity and fast responses. Two linear equations can be obtained in the range from 0 to 30 μM for Cu 2+ and from 0 to 45 μM for Fe 3+ (detection limits: Cu 2+ , 1.98 μM; Fe 3+ , 2.15 μM). These results may provide promising applications in cation sensing fields.
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高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 12
·1-7
·
IF 5.479
Leng Yumin,Fu Yu,Lu Zhiwen,Sang Zhipei,Liu Kecheng,Du Chenxi,Ma Linfeng
A general approach is presented for synthesis of multicolored gold nanoparticles (GNPs) by Au(I)-mediated generation of interlocking rings in proteins and antibiotics. The Au(I) ions are shuttled from proteins to antibiotics, and this causes the formation of interlocking rings. The multicolored GNPs of different sizes were synthesized in the rings by using the rapid nucleation method. To take the unique colors of GNPs, a functional array was designed for the colorimetric determination and discrimination of antibiotics, specifically of amoxicillin, chlortetracycline, erythromycin, spiramycin, neomycin, thiamphenicol, gentamycin and lincomycin. The method is based on the “three color” (RGB) principle. The color response patterns are characteristic for each antibiotic and can be quantitatively differentiated by statistical techniques. The limits of detection (LOD, at S/ N = 3) for spiramycin (Sp) have been calculated to be 0.18 μM and 0.10 μM in water and milk, respectively. The good linear range (from 0.3 to 3.5 μM) has been used for the quantitative assay of Sp in a certified reference material.
Schematic presentation of gold nanoparticles (GNPs) synthesis via formation of interlocking rings in protein and antibiotics. The Au(I) ions mediate protein and antibiotics to be interlocking rings, which are quickly fixed via microwave reaction. The GNPs are synthesized and assembled in the rings.
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JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 12
·6885-6893
·
IF 2.047
Song Angang,Cao Guoqin,Zhu Di,Zhao Baofeng,Fu Zhenya,Cao Shuaiqi,Wang Qingjie,Hu Junhua
Nb-doped TiO 2 (NTO) thin films were sputtered on glass substrate followed by a simple annealing process in air. The photoelectric cooperative optimization was discussed based on the structural, optical and electrical characteristics. The influence of oxygen flow during deposition on materials chemistry and performance was analyzed. Hall measurement showed a strong dependence of transparent conductivity on the oxygen flow. Oxygen vacancies are related to the phase transitions from the rutile to anatase TiO 2 during annealing. The chemical states of Nb, Ti and O before and after annealing were discussed. The achievement of optimized transparent conductivity was resultant from the fine-tuning of the doped chemistry and special interplay of dopants and host lattice. Graphical
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JOURNAL OF POLYMER RESEARCH
·
2013
·Vol. 20
·期 7
·1-9
·
IF 2.019
Xu Jingmei,Ren Chunli,Cheng Hailong,Ma Li,Wang Zhe
Double fluoride 2,5-bis(4-fluorophenyl)-1,3,4-oxadiazole (BFO) monomer was synthesized. Copolymerization of BFO, 2,2-bis(4-hydroxypheny)propane (bisphenol A) and 3′3-disulfonate-4′4-dichloro dipheny sulfone (SDCDPS) at different molar ratio resulted in a new poly (aryl ether sulfone) containing 1, 3, 4-oxadiazole polymers (SPAESO). The structures of monomer BFO and copolymer were confirmed by FT-IR and 1 H NMR. The TEM pictures showed that the ion clusters were formed and distributed evenly in SPAESO copolymer matrix. The sulfonated polyoxadiazole membranes exhibited excellent thermal, dimensional and oxidative stability and lower methanol diffusion coefficient. The proton conductivity of SPAESO-3 was 7.5 × 10 −2 Scm −1 at 120 °C while the methanol permeability coefficient of SPAESO-3 was only 2.23 × 10 −7 cm 2 S −1 at 25 °C. According to the comprehensive performance, the sulfonated polyoxadiazole membranes may be the alternative materials as proton exchange membrane for PEMFC at medium-high temperature operation.
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Nano-Micro Letters
·
2021
·Vol. 14
·期 1
·1-12
·
IF 16.419
Zhu Mengya,Li Guangyong,Gong Wenbin,Yan Lifeng,Zhang Xuetong
A calcium-doped boron nitride (Ca-BN) aerogel was synthesized by introducing Ca into crystal structure of BN building blocks.
The aerogels exhibited superior high-temperature stability and could resist the burning of butane flame (~1300 °C) in air atmosphere.
Ca-BN aerogel, together with Al foil, can effectively hide thermal target at high temperature up to 1300 °C.
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JOURNAL OF MOLECULAR MODELING
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2021
·Vol. 27
·期 9
·1-12
·
IF 1.81
Zhu Yajie,Ding Yan,Tian Dongxu,Li Yan,Zhuang Linwu,Wang Yinpeng,Xiao Wei,Zhu Jingbo
In this paper, a novel molecularly imprinted polymer (MIP) for specific adsorption of steviol glycosides was designed, and the imprinting mechanism of self-assembly system between template and monomers was clearly explored. Firstly, steviol (STE) was chosen as dummy template, and the density functional theory (DFT) at B3LYP/6–31 + G (d, p) level was used to select monomers, imprinting molar ratios, solvents, and cross-linking agents. The selectivity to five steviol glycosides was also calculated. Importantly, reduced density gradient (RDG) theory combined with atom in molecules (AIM) and infrared spectrum (IR) was applied to investigate the bonding situation and the nature of noncovalent interaction in self-assembly system. The theoretical designed results showed that the template which interacts with acrylic acid (AA) has the minimum binding energy, and the complex with the molar ratio of 1 : 4 has the most stable structure. Toluene (TL) and ethylene glycol dimethacrylate (EGDMA) were chosen as the optimal solvent and cross-linking agent, respectively. Five hydrogen bonds formed in the self-assembly system are the key forces at the adsorption sites of MIPs through the RDG and AIM analyses. The MIPs were synthesized by theoretical predictions, and the results showed that the maximum adsorption capacity towards dulcoside A is 26.17 mg/g. This work provided a theoretical direction and experimental validation for deeper researches of the MIPs for steviol glycosides. In addition, the method of RDG theory coupled with AIM and IR also could be used to analyze other imprinting formation mechanisms systematically.
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高影响因子
JOURNAL OF POLYMER RESEARCH
·
2020
·Vol. 27
·期 4
·1-11
·
IF 2.426
Hou Lei,Wang Zhe,Xu Jingmei,Chen Wenbo,Yang Cancan,Wang Yuanyuan
Mixed matrix membranes (MMMs) were fabricated by incorporating carboxylated multi-walled carbon nanotubes (MWCNTs) into a poly (arylene fluorene ether ketone) that contained amino groups (Am-PAFEK) matrix to improve CO 2 separation performance. The combination of MWCNTs and Am-PAFEK exerted a favorable synergistic effect on the permeability and selectivity of membranes. The extraordinary smooth wall of MWCNTs acts as a highway through which gas passes, providing better permeability. The Am-PAFEK matrix itself has a dense internal structure that provides high gas selectivity. MWCNTs particles evenly distributed among the Am-PAFEK membrane due to the non-covalent bond interaction between the amino and carboxyl group. Efficient CO 2 transport pathways were constructed by homogeneous dispersion of MWCNTs with in MMMs, leading to maintained good selectivity and enhanced permeability. When the amount of carbon nanotubes added was 3 wt.%, that increased by above 60% in comparison to the Am-PAFEK membrane permeability, the CO 2 /CH 4 and CO 2 /N 2 selectivity of the Am-PAFEK/MWCNTs-3% membrane achieved 35.02 and 30.09, respectively. Therefore, the strategy of blending MWCNTs with Am-PAFEK exhibited a promising approach for improving gas permeability.
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高影响因子
Frontiers of Environmental Science & Engineering
·
2021
·Vol. 16
·期 3
·1-12
·
IF 4.357
Huang Yicai,Chen Jiayuan,Duan Qiannan,Feng Yunjin,Luo Run,Wang Wenjing,Liu Fenli,Bi Sifan,Lee Jianchao
Antibiotics are widely used in medicine and animal husbandry. However, due to the resistance of antibiotics to degradation, large amounts of antibiotics enter the environment, posing a potential risk to the ecosystem and public health. Therefore, the detection of antibiotics in the environment is necessary. Nevertheless, conventional detection methods usually involve complex pretreatment techniques and expensive instrumentation, which impose considerable time and economic costs. In this paper, we proposed a method for the fast detection of mixed antibiotics based on simplified pretreatment using spectral machine learning. With the help of a modified spectrometer, a large number of characteristic images were generated to map antibiotic information. The relationship between characteristic images and antibiotic concentrations was established by machine learning model. The coefficient of determination and root mean squared error were used to evaluate the prediction performance of the machine learning model. The results show that a well-trained machine learning model can accurately predict multiple antibiotic concentrations simultaneously with almost no pretreatment. The results from this study have some referential value for promoting the development of environmental detection technologies and digital environmental management strategies.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 27
·12876-12883
·
IF 3.553
Zhang Peng,Zhang Hongwei,Wang Shuhan,Lei Xueqin,Yang Jiangtao,Li Zimeng,Zhu Haibo,Bao Xiaojun,Yuan Pei
Silica hollow microspheres with moonscape-like rough surface (RS) and macroporous surface (MS) have been controllably synthesized by a water–oil–water three-phase emulsion method, which are used as supports of the heterogeneous catalysts for the catalytic hydrogenation of nitrile-butadiene rubber (NBR). It is found that Pd can be uniformly dispersed on both amino-functionalized RS and MS supports and both the catalysts show high hydrogenation activity with 100% selectivity to C=C bonds. However, the reusability of Pd/N-RS is much better than that of Pd/N-MS, maintaining 92% of activity without any regeneration treatment after five times of recycling experiment. The high activity retention is because the moonscape-like surface of the RS support is favorable for the contact of NBR macromolecules with the active sites, and more importantly, the NBR macromolecules do not need to diffuse into the interior of the catalyst, leading to fast desorption of the hydrogenated NBR from the surface of catalyst and re-exposure of the active sites.
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高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2021
·Vol. 25
·期 10
·2471-2478
·
IF 2.647
Song Qian,Li Hui,Liu Junji,Hu Shi
Cyclic voltammetry (CV) is a powerful and popular electrochemical technique widely used to study the surface structure of materials through the electrochemical behaviors. Herein CV is utilized to study the electrochemical deposition of selenium (Se) on carbon black-supported Pt nanostructures. We synthesized carbon-loaded platinum nanoparticles (Pt/C) by microwave method and studied the electrochemical behavior of selenium on them. Through the experiment of changing the reverse potential, the corresponding relationship between the Se deposition peak and stripping peak was clarified and the deposition and stripping process of Se was proposed. Meanwhile, we synthesized cubic and octahedral nanocrystals of Pt, and used CV to study the Se deposition on these nanosctructures supported by carbon. It was found that the relative intensity of UPD peaks on Pt is different, as Pt cube @C is dominated by (100) and Pt oct @C electrode is dominated by (111) while Pt@C falls in between.
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Nano Research
·
2024
·Vol. 17
·期 8
·6795-6802
·
IF 9.5
Lu Qi,Yang Jiawei,Zhou Chaofan,Hu Zhaoning,Bu Saiyu,Guo Bingbing,Zhao Yixuan,Liao Junhao,Shang Mingpeng,Chen Ge,Jia Kaicheng,Yin Jianbo,Zeng Qiang,Lin Li,Liu Zhongfan
The transfer of graphene from metallic substrates onto application-specific substrates is usually inevitable for the applications of high-quality graphene films derived from chemical vapour deposition (CVD) approaches. Commonly used to support the graphene films during the transfer, the coating of the polymer would produce the surface contaminations and hinder the industrially compatible transfer. In this work, through the thermal imidization of polyamide acid (PAA) to polyimide (PI) and tuning of the concentration of dangling chains, we achieved the ultraclean and crack-free transfer of graphene wafers with high electronic quality. The resulting contamination-free and hydrophilic surface also enabled the observed improved cell viability in a biomedical applications. By avoiding aqueous etching or the usage of strong bases, our proposed transfer method is industrially compatible for batch transfer of graphene films towards the real applications.
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-8
·
IF 14.7
Xu Kai,Liu Jin-Cheng,Wang Wei-Wei,Zhou Lu-Lu,Ma Chao,Guan Xuze,Wang Feng Ryan,Li Jun,Jia Chun-Jiang,Yan Chun-Hua
Oxygen vacancy (O v ) is an anionic defect widely existed in metal oxide lattice, as exemplified by CeO 2 , TiO 2 , and ZnO. As O v can modify the band structure of solid, it improves the physicochemical properties such as the semiconducting performance and catalytic behaviours. We report here a new type of O v as an intrinsic part of a perfect crystalline surface. Such non-defect O v stems from the irregular hexagonal sawtooth-shaped structure in the (111) plane of trivalent rare earth oxides (RE 2 O 3 ). The materials with such intrinsic O v structure exhibit excellent performance in ammonia decomposition reaction with surface Ru active sites. Extremely high H 2 formation rate has been achieved at ~1 wt% of Ru loading over Sm 2 O 3 , Y 2 O 3 and Gd 2 O 3 surface, which is 1.5–20 times higher than reported values in the literature. The discovery of intrinsic O v suggests great potentials of applying RE oxides in heterogeneous catalysis and surface chemistry.
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