Nature Communications
·
2016
·Vol. 7
·期 1
·1-8
·
IF 11.329
Zhu Xiaojiao,Guo Yuqiao,Cheng Hao,Dai Jun,An Xingda,Zhao Jiyin,Tian Kangzhen,Wei Shiqiang,Cheng Zeng Xiao,Wu Changzheng,Xie Yi
Ferromagnetism is usually deemed incompatible with superconductivity. Consequently, the coexistence of superconductivity and ferromagnetism is usually observed only in elegantly designed multi-ingredient structures in which the two competing electronic states originate from separate structural components. Here we report the use of surface molecular adsorption to induce ferromagnetism in two-dimensional superconducting NbSe 2 , representing the freestanding case of the coexistence of superconductivity and ferromagnetism in one two-dimensional nanomaterial. Surface-structural modulation of the ultrathin superconducting NbSe 2 by polar reductive hydrazine molecules triggers a slight elongation of the covalent Nb–Se bond, which weakens the covalent interaction and enhances the ionicity of the tetravalent Nb with unpaired electrons, yielding ferromagnetic ordering. The induced ferromagnetic momentum couples with conduction electrons generating unique correlated effects of intrinsic negative magnetoresistance and the Kondo effect. We anticipate that the surface molecular adsorption will be a powerful tool to regulate spin ordering in the two-dimensional paradigm.
研究领域:
凝聚态物理
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材料科学
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DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 60
·48885-48892
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IF 3.84
Hongkai Xie,Wenhua Ji,Dahui Liu,Wei Liu,Daijie Wang,Ruimin Lv,Xiao Wang
In this work, surface molecularly imprinted polymers with dummy templates were developed as the selective sorbents for preparation of dencichine from the extract of Panax notoginseng for the first time. The polymers were characterized by scanning electron microscopy and Fourier transform infrared spectroscopy. The performances of molecularly imprinted and non-imprinted polymers were evaluated, which included selective recognition, adsorption isotherms and adsorption kinetics. Optimization of various parameters affecting molecularly imprinted solid phase extraction, such as sample loading pH and flow rate, the composition and volume of the eluting solvent and the composition and volume of the washing solvent were investigated. Compared with NISPE, MISPE displayed improved specific adsorption performance. Dencichine with a purity of 98.7% was obtained from the aqueous extract of Panax notoginseng with the average recovery of 83.7% (n = 3).
研究领域:
药物化学
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分析化学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2014
·Vol. 38
·期 4
·1780-1788
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IF 3.159
Yu-zhu Yang,Qian Tang,Cheng-bin Gong,Xue-bing Ma,Jing-dong Peng,Michael Hon-wah Lam
Photoresponsive surface molecular imprinting polymer (SMIP) microspheres were synthesized on silica microspheres by surface polymerization using a water-soluble azobenzene-containing 4-[(4-methacryloyloxy)phenylazo]benzenesulfonic acid as the functional monomer. The SMIP microspheres displayed good photoresponsive properties and specific affinity towards bisphenol A (BPA) with high recognition ability (maximal adsorption capacity: 6.96 μmol g−1) and fast binding kinetics (binding constant: 2.47 × 104 M−1) in aqueous media. Upon alternate irradiation at 365 and 440 nm, the SMIP microspheres could quantitatively bind and release BPA. Analytical application of the SMIP microspheres for the detection of trace BPA concentration in mineral water and tap water has been carried out successfully, and therefore a simple and quick detection method for trace BPA in the environment was established.
研究领域:
环境科学
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材料科学
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分析化学
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
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2016
·
IF 1.272
Zilong Zhao,Dafang Fu,Binsheng Zhang
Novel strategy to synthesize palygorskite-supported surface molecularly imprinted polymer (SMIP) for bisphenol A (BPA) template was presented. Fourier transform infrared, scanning electron microscopy, and elemental analysis were employed for the characterization of the resulting composites. When compared with the molecularly imprinted polymer, the SMIP exhibited more excellent affinity and selectivity towards BPA in aqueous solution, with the affinity constant (b) of 1.929, the Freundlich constants (KF) of 25.758, and the distribution coefficient (Kd) of 128.390. The adsorption behaviors of the SMIP were well described by Freundlich isotherm model and the pseudo-second-order model. Moreover, the sustainable reusability of the SMIP without significant loss in rebinding capacity was affirmed in four repeated cycles. These results demonstrated the potential of the prepared SMIP as an advanced separation materials for the elimination of specific endocrine disruptor in aquatic environment.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 52
·41377-41384
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IF 3.84
Xiaoli Gu,Hongliang He,Chong-zhi Wang,Yankun Gao,Hongjuan Zhang,Junli Hong,Shuhu Du,Lina Chen,Chun-su Yuan
Surface molecularly imprinted polymers (MIP@SBA-15) imprinted on the surface of hybrid nanostructured organic/inorganic materials (SBA-15) were prepared for the selective extraction and detection of baicalin (BA) in biological samples. The surface morphologies and characteristics of the imprinted and non-imprinted polymers were characterized by Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA) and nitrogen adsorption–desorption isotherms. The results indicated that the polymers were successfully grafted onto the surface of SBA-15 and possessed a highly ordered mesoporous structure. In binding tests, MIP@SBA-15 reached saturated adsorption within 80 min and exhibited significant specific recognition toward BA with a large adsorption capacity. In addition, the prepared MIP@SBA-15 was used as a selective sorbent for solid-phase extraction of BA from biological samples. Recoveries of BA from the liver and spleen ranged from 90.6% to 90.9% with RSD <3.7%. All these results reveal that this method is simple, rapid and sensitive for effectively extracting and detecting trace BA in biological samples.
研究领域:
分析化学
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药物分析
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Dongliang Xie,Yi Kuang,Bingnan Yuan,Yunlong Zhang,Chenyu Ye,Yuyi Guo,Hua Qiu,Juanna Ren,Saud O. Alshammari,Qamar A. Alshammari,Zeinhom M. El-Bahy,Kui Zhao,Zhanhu Guo,Qingqing Rao,Shengxiang Yang
As a typical bioflavonoid, diosmetin is desirable in the field of natural medicine, healthy food, and cosmetics by anti-cancer, antibacterial, antioxidant, estrogen-like and anti-inflammatory activities, and it comes from a wide range of sources in traditional Chinese medicine like spider fragrance, spearmint and chrysanthemum, as well as in Citrus fruit. However, traditional analytical methods such as silica gel column chromatography face multiple challenges in the selective extraction of diosmetin from biological materials and traditional Chinese medicinal materials. Therefore, it is urgent to develop a new type of absorbent with high efficiency, recyclability and good specificity to diosmetin. In this investigation, a magnetic surface molecularly imprinted polymer (labeled as Diosmetin/SMIPs) was synthesized employing magnetic nanoparticles as the carrier and 4-vinylpyridinyl (4-VP) as the functional monomer by surface imprinting technology. The functional monomer was screened by the binding energy (ΔE) between functional monomers and template molecules via computational simulation. The Diosmetin/SMIPs had a high level of specific recognition and adsorption capability towards diosmetin with a 20.25 mg g -1 adsorption capacity and an imprinting factor (IF) of 2.28. Additionally, it demonstrated excellent regeneration performance with 8 adsorption/desorption cycles. In addition, 91.20 %–94.16 % of spiked diosmetin was recovered from the lemon peel samples. The strategy of constructing Diosmetin/SMIPs based on computational simulation can effectively enhance the specific adsorption performance of diosmetin. Meanwhile, Diosmetin/SMIPs synthesized by imprinting polymerization showed excellent anti-interference and reusability, and realized efficient targeted extraction of diosmetin from lemon peel samples. The results of this investigation provide a promising adsorbent for selective enrichment of diosmetin from Citrus fruit and complicated materials.
研究领域:
天然药物化学
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材料科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
Desalination and Water Treatment
·
2016
·
IF 1.272
Song Li,Lei Fang,Miaomiao Ye,Yan Zhang
For norfloxacin removal in aquatic environment, TiO2 particles (P25) were modified via surface molecular imprinting technique to improve the adsorption property and sustainable use by photocatalytic regeneration. Orthogonal experiment was adopted to quantify the significance of preparation factors and determine the optimum preparation conditions. The adsorption of norfloxacin on the molecular imprinted particles (MIPs), the non-imprinted particles (NIPs), and P25 fitted the second-order adsorption model and Langmuir model well. The MIPs showed a higher adsorption capacity toward norfloxacin than the NIPs and P25. The adsorption rate constant, maximum adsorption capacity, and Langmuir constant of the MIPs toward norfloxacin were 0.49 g mg−1 min−1, 2.99 mg g−1, and 2.4 L mg−1, respectively. Removal efficiencies for norfloxacin, ciprofloxacin, carbamazepine, and phenol by the MIPs were 76.99, 78.81, 7.87, and 2.68%, respectively, which indicated that the MIPs had higher affinity toward norfloxacin and fluoroquinolones with similar structures. Moreover, the MIPs exhibited the photocatalytic property and could be regenerated by UV irradiation with stable removal efficiency for norfloxacin in five adsorption–regeneration cycles.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
Frontiers in Chemistry
·
2020
·
IF 3.693
Chen Mei-jun,Yang Hai-lin,Si Ya-min,Tang Qian,Chow Cheuk-fai,Gong Cheng-bin
As a moderately toxic organophosphorus pesticide, profenofos (PFF) is widely used in agricultural practice, resulting in the accumulation of a high amount of PFF in agricultural products and the environment. This will inevitably damage our health. Therefore, it is important to establish a convenient and sensitive method for the detection of PFF. This paper reports a photoresponsive surface-imprinted polymer based on poly(styrene-co-methyl acrylic acid) (PS-co-PMAA@PSMIPs) for the detection of PFF by using carboxyl-capped polystyrene microspheres (PS-co-PMAA), PFF, 4-((4-(methacryloyloxy)phenyl)diazenyl) benzoic acid, and triethanolamine trimethacrylate as the substrate, template, functional monomer, and cross-linker, respectively. PS-co-PMAA@PSMIP shows good photoresponsive properties in DMSO/H2O (3:1, v/v). Its photoisomerization rate constant exhibits a good linear relationship with PFF concentration in the range of 0~15 μmol/L. PS-co-PMAA@PSMIP was applied for the determination of PFF in spiked tomato and mangosteen with good recoveries ranging in 94.4–102.4%.
研究领域:
分析化学
·
环境科学
·
农药残留检测
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DOI
高影响因子
MACROMOLECULAR RESEARCH
·
2022
·Vol. 30
·期 10
·719-730
·
IF 2.127
Zhang Xing,He Juan,Wang Huige,Xu Pengfei,Wang Mingyu,Li Yuanyuan,Chen Jing,He Lijun
In this study, surface molecularly imprinted polymers were synthesized with the metal-organic framework NH 2 -MIL-53 as carrier and naringenin as alternative template of Ochratoxin A (OTA). The amino groups on the surface of NH 2 -MIL-53 reacted with the epoxy groups in glycidyl methacrylate (GMA). Subsequently, the double bonds of the GMA grafting on the surface of the material were used for polymerization to prepare the surface molecularly imprinted polymers. The obtained polymers were characterized by scanning electron microscope, transmission electron microscope, energy spectrometer, Fourier infrared spectrometer, X-ray diffraction, and laser particle size analyzer. Synthetic polymer was combined with solid phase extraction for separation and enrichment of trace OTA in grains. The spiked recoveries were found to be 78.95–106.45%, with relative standard deviations ranging from 5.16% to 6.31%. The detection limit and the quantification limit of the method were 0.04 µg·kg −1 and 0.12 µg·kg −1 , respectively. Comparing the pretreatment effects of the self-made cartridge and the immunoaffinity column on the OTA in the sample, it showed that the self-made column had excellent performance and provided a new pretreatment method for the treatment of OTA in grains.
研究领域:
食品科学
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分析化学
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2015
·Vol. 7
·期 20
·8740-8749
·
IF 1.821
Fengling Zhu,Xiangyang Yan,Shaomin Liu
Surface molecularly imprinted polymers (SMIPs) with high performance in selectively recognizing alanine (Ala) were prepared using a facile surface molecular-imprinting technique. The Ala SMIPs were prepared by heating suspension polymerization with methacrylic acid as the functional monomer and ethylene glycol dimethacrylate as the cross-linker on vinyl-SiO2 surface. The obtained materials were characterized using transmission electron microscopy, scanning electron microscopy, and Fourier transform infrared spectroscopy. The synthesis conditions for the SMIP formation were systematically investigated to obtain the highest selectivity and binding capacity. The formation and monodispersity of the SMIPs are mainly affected by the molar ratio of the template, the functional monomer, and compositions of the cross-linker and solvent. In comparison to imprinted polymers prepared using traditional polymerizations, the obtained SMIPs exhibited a regular spherical shape and were relatively monodispersed. The template recognition properties were evaluated; the results showed that the maximal sorption capacity (Qmax) of the resulting SMIPs was up to 831 μmol g−1, whereas that of non-imprinted polymers was only 341 μmol g−1. A kinetic binding study showed that the sorption capacity reached 49.73% of Qmax in 30 min and sorption equilibrium at 60 min. The SMIPs have excellent accessibility and affinity toward Ala because the selectivity coefficients of SMIPs for Ala with respect to Gly, His, Glu and Phe were 2.36, 1.79, 2.48, and 2.56, respectively. The regeneration process verified that the SMIPs have admirably stable adsorption capacity toward Ala and can be regenerated up to eight times.
研究领域:
生物化学
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材料科学
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产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2014
·Vol. 182
·期 3
·753-761
·
IF 3.719
Zheng Xudong,Pan Jianming,Gao Lin,Wei Xiao,Dai JiangDong,Shi WeiDong,Yan Yongsheng
We have prepared highly monodisperse silica spheres doped with an Eu(III) complex and coated them with a nanoshell of a copper-imprinted polymer. The silica cores have a diameter of 200 nm, and the nanoshells have a thickness of 10–30 nm. The nanoparticles were characterized by means of scanning electron microscopy and transmission electron microscopy. The material is shown to be a viable fluorescent probe for Cu(II) ions. The surface molecular imprint renders the nanoprobe sensitive and selective. It was successfully applied to the detection of Cu(II) and gave a linear fluorescent response in the 10–100 μM concentration range. Compared to other methods, this one features high selectivity, sensitivity, low cost and ease of operation. We assume that this assay is applicable to routine trace determination of Cu(II) in water or biological environments. By adopting the appropriate functional monomers, cross-linking agents and template ions, the method can potentially be used to fabricate a highly selective imprinted probe for other heavy and transition metal ions.
The europium complex fluorescent probe detected the content of divalent copper by surface ion imprinting. The imprinted shell of the probe bound Cu(II) rapidly and selectively. Due to Cu(II) quenching of the fluorescent core, the fluorescence intensity decreases.
研究领域:
分析化学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Arabian Journal of Chemistry
·
2019
·
IF 3.298
Kamran Bashir,Pengqi Guo,Guoning Chen,Yunzhe Li,Yanhui Ge,Hua Shu,Qiang Fu
In present study, an investigation was carried out to develop and validate an analytical method for the selective extraction and determination of griseofulvin (GSF) from plasma samples. For this purpose, a rational approach was made to synthesize and characterize the surface molecularly imprinted polymers (SMIPs). The SMIPs were utilized as solid phase extraction (SPE) sorbents. The SMIPs were prepared by using GSF as template molecule on the surface of modified silica particles through a non-covalent technique. The particles demonstrated high adsorption capacity (119.1 µg/mL), fast adsorption equilibrium time (30 min) and good recognition selectivity for the template drug. The scanning electron microscopy and infrared spectroscopy were used to explain the structural and morphological characteristics of the SMIPs and surface non-imprinted polymers. The SPE method was combined with HPLC for plasma analysis. The method validation results demonstrated that the established method possessed good linearity for GSF ranging from 0.1 to 50 µg/mL (R 2 = 0.997). The limit of detection for this method was 0.02 µg/mL for rat plasma samples. The recoveries of GSF from spiked plasma samples were (90.7–97.7%) and relative standard deviations were (0.9–4.5%). Moreover, the SMIPs as selective SPE sorbent can be reused more than 8 times which is a clear advantage over commercial SPE sorbents. Finally, the usefulness of the proposed strategy was assessed by extraction and detection of GSF in real rat plasma samples.
研究领域:
药物分析
·
材料科学
·
生物医学工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）