MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Ying Wang,Hong-Xing Li,Sheng-Ming Xie,Bang-Jin Wang,Jun-Hui Zhang,Li-Ming Yuan
Porous organic cages (POCs) are a new class of advanced porous molecular materials, which are self-assembled from discrete, shape-persistent, cage-like molecules through relatively weak intermolecular forces. POCs have recently received extensive interest in diverse fields due to their noteworthy features of good solubility, unique pore structure, high stability, tunable pore size and volume, and so on. In this study, we report a [3 + 6] prismatic homochiral POC (NC1-R) as the stationary phase for preparing a capillary gas chromatographic (GC) column by a static coating method. Various types of mixtures have been well separated on the coated column, involving n -alkanes, n -alcohols, alkylbenzenes, positional isomers, structural isomers, and cis- / trans -isomers. Most importantly, the column also exhibits excellent chiral resolution capability for racemates. Twenty-three racemates, including alcohols, epoxides, esters, lactones, ethers, amino acid derivatives, amines, and sulfoxides, have been well resolved on the column. Among these racemates, about half (11 of the 23) could not be resolved on a commercial β-DEX 120 column (per- O -methylated β-cyclodextrin-based column), suggesting the advantageous performance of the present column. Furthermore, the fabricated column shows good reproducibility in terms of the retention times of analytes, with relative standard deviations (RSDs) in the ranges 0.02–0.19 %, 0.12–0.36 %, and 0.41–0.59 % for intra-day ( n = 6), inter-day ( n = 6), and column-to-column ( n = 3), respectively, and good thermal stability at least up to 300 °C. This work demonstrates the good application prospects of NC1-R for GC separations, especially for GC enantioseparations.
研究领域:
分析化学
·
材料科学
✓ 已验证
DOI
高影响因子
BIOPROCESS AND BIOSYSTEMS ENGINEERING
·
2018
·Vol. 41
·期 7
·1051-1060
·
IF 2.139
Han Juan,Rong Junhui,Wang Yun,Liu Qian,Tang Xu,Li Cheng,Ni Liang
Abstract Magnetic double-shell hybrid microspheres (Fe 3 O 4 @SiO 2 @p(NIPAM- co -GMA)) have been developed as a promising supported substrate for the immobilization of cellulase. Since the surface of the magnetic microspheres not only contains an epoxy group from GMA (glycidyl methacrylate) that can covalently bind to the enzyme, but also has an intelligent temperature response property from NIPAM ( N -isopropylacrylamide), the cellulase can be covalently bonded to the magnetic microspheres and have a temperature-sensitive capability. The immobilized cellulase has the recovery ability of cellulase activity after a high-temperature inactivation. The average amount and activity of immobilized enzymes, respectively, was 233 mg g −1 , 57.4 U mg −1 under the optimized conditions. The experimental results show that the immobilized cellulase has a wider catalytic temperature range, better temperature and storage stability. The residual activity still remained about 65.6% of the initial activity after the sixth catalysis run, which indicated that the immobilized enzyme had high reproducibility. Graphical abstract
研究领域:
生物化学
·
生物技术
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2021
·Vol. 13
·期 19
·3270
·
IF 4.329
Sihan Zhang,Zhihua Xu,Jiaqi Guo,Haiying Wang,Yibo Ma,Xianming Kong,Hongtao Fan,Qian Yu
Polystyrene (PS) spheres were prepared through an emulsifier-free emulsion polymerization method, in which the reaction time, ionic strength, concentrations of copolymer were studied in detail. The resulting PS microspheres and Ag nanoparticles were used to construct a surface enhanced Raman scattering (SERS) substrate by a layer-by-layer assembly method. A relatively uniform distribution of PS/Ag in the films was obtained, and the multilayer substrate presented excellent SERS reproducibility and a tunable enhancement effect. The SERS substrate was used for detecting harmful pesticides (malachite green and dimetridazole) in food samples, with a limit of detection as low as 3.5 ppb. The obtained plasmonic composite has a promising future in the field of SERS sensing.Keywords:polystyrene;self-assembly;Ag nanoparticle;layer by layer;SERS;reproducibility
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2019
·Vol. 30
·期 47
·475202
·
IF 3.399
Tingting Ge,Sheng Yan,Lingjun Zhang,Hong He,Li Wang,Shunbo Li,Yuan Yuan,Guo Chen,Yingzhou Huang
Surface enhanced Raman spectroscopy (SERS) detection in microfluidics is an interesting topic for its high sensitivity, miniaturization and online detection. In this work, a SERS detection in microfluidics with the help of the Ag nanowire aggregating based on dielectrophoresis (DEP) is reported. The Raman intensities of molecule in microfluidics is greatly enhanced in the naturally generated nanogaps of Ag nanowire aggregating modulated by DEP. Firstly, the influence of DEP voltage and time on Ag nanowire aggregating is investigated to figure out the optimal condition for SERS. And then, the SERS intensities of methylene blue and rhodamine6G at various concentration with high reproducibility and uniformity are studied. Furthermore, the experiment data demonstrate this DEP–SERS system could be repeated used for different molecule detections. At last, the SERS of melamine is measured to explore its application on food safety. Our work anticipates this nanowire assisted repeatable DEP–SERS detection in microfluidics with high sensitivity could meet the emerging needs in environmental pollution monitoring, food safety evaluation, and so on.
研究领域:
分析化学
·
纳米技术
·
食品安全
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Solar RRL
·
2018
·Vol. 3
·期 4
·1800313
·
IF 0
Xinding Lv,Xuemei Dong,Zhili Ye,Junshuai Zhou,Fei Deng,Yan-Zhen Zheng,Xia Tao
State-of-the art perovskite solar cells (PSCs) are obtained by using a high-crystalline and uniform morphological perovskite film that usually requires a thermal procedure to induce its crystallization. Room temperature processing photoactive perovskite film represents a feasible approach to break through the technology barrier arising from high temperature annealing procedures; however, the photovoltaic performance of fabricated PSCs varies significantly in most routine laboratories with ambient temperature altering. Herein, the authors report for the first time that highly photoactive black phase FA-based perovskite films with high performance and reproducibility can be room temperature processed via the Br induced crystallization effect. It is found that Br adding content varies as a function of ambient temperature fluctuation from 35–40 to 20–25 °C. The halide Br/I formulation are 0.2/2.8 and 0.5/2.5 for room-temperature perovskite crystallization in ambient temperatures of 35–40 and 20-25 °C, yieldings solar to electric power conversion efficiency of 19.59 and 17.53% with high reproducibility, respectively. This efficiency (19.59%) is comparable to the best-performing PSCs based on thermal processing perovskite films. This work provides a valuable and practical guide to room-temperature fabrication of PSCs with high efficiency and reproducibility by delicate control of halide anions.
研究领域:
材料科学
·
太阳能技术
✓ 已验证
产品关联
DOI
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yourong Wu,Wanqian Cai,Jiansen Wen,Shiqi Zhong,Xingan Jiang,Cong Lin,Mei Lin,Tengfei Lin,Min Gao,Chunlin Zhao,Baisheng Sa,Xiao Wu
Powder adsorbents present limited recyclability when used for wastewater treatment. Bulk materials prepared via eco-friendly approaches typically exhibit excellent reproducibility over powders in terms of removing pollutants from aquatic environments. Here, biomass-based aerogels were synthesized via ball milling a mixture of modified moxa ash (a type of moxibustion waste), carbon nanotubes and ammonia, combined with agarose as biomolecule. The obtained aerogels display low density, high porosity, remarkable mechanical properties, and exceptional repeatability and stability for removing organic pollutants. By employing a two-dimensional (2D) aerogel membrane, pollutants such as 10 mg/L mitoxantrone (MTX), 5 mg/L methylene blue, 5 mg/L malachite green, or 5 mg/L rhodamine B could be dynamically adsorbed and swiftly filtered out, achieving nearly 100 % of the removal rate. For three-dimensional (3D) aerogels, efficient removals of MTX (98.4 % at 135 min) and cationic dyes under various conditions were observed, in which the adsorption capacity reached 28.23 mg/g for low concentration of MTX at 120 min. After four cycles, the aerogel still retained 93 % of its original capacity and the removal rate was still 92.4 %. The adsorption process obeys second-order kinetics and adheres to the Freundlich and Temkin isotherm models. Furthermore, the primary mechanism by which the aerogels adsorb MTX includes pore filling, electrostatic interactions, π-π conjugation and hydrogen bonding. The adsorption mechanism was better explained by the results of density functional theory. Biomass-based 2D/3D aerogels are promising, low-cost, eco-friendly and highly efficient absorbents for mitigating wastewater contamination.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Caoling Li,Ling Lei,Wenbo Huang,Junxing Hao,Kangbing Wu
The development of simple, low-cost, and reliable analytical methods for detecting Tetrabromobisphenol A (TBBPA) is crucial, given its widespread environmental presence and high biological toxicity. Herein, a ultralow background and renewable electrochemical sensing platform was developed using specific porous copper-organic framework modified carbon paste electrode (Cu-BTC/CPE), enabling highly sensitive and selective detection of TBBPA. Due to its unique porous structure and abundant active sites, the Cu-BTC/CPE exhibits superior electroadsorption capacity (including adsorbed charge and binding energy) as well as enhanced electrocatalytic activity for TBBPA. By leveraging the plasticity and polishability of paraffin oil and graphite powder mixtures, the constructed Cu-BTC/CPE electrode demonstrates admirable repeatability (≥ ten times) and stability (RSD < 5%). Furthermore, the reusable and cost-effective Cu-BTC/CPE-based sensor features a wide linear range of 3–500 nM with a low detection limit of 0.53 nM. It was successfully applied to real samples (plastic e-waste, soil, and sewage), and the results consisted with the values that obtained by high-performance liquid chromatography-mass spectrometry. In brief, this novel sensing system holds considerable promise for rapid, convenient, and on-site monitoring of TBBPA in complex environmental matrices.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2016
·
IF 4.035
Chenglong Hu,Shaoyun Chen,Yuan Wang,Xueqing Liu,Jiyan Liu,Weihong Zhang,Jian Chen,Wenzhi Zhang
Recently, considerable efforts have been made to prepare Surface-enhanced Raman scattering (SERS) nanostructures with high sensitivity and good reproducibility, which are always difficult and costly. In this article, we provide a simple route on the synthesis of silver particles with a novel single {111} plane and triangular morphology by reducing silver nitrate with poly(vinyl pyrrolidone) (PVP) in N,N-dimethylformamide (DMF) solutions. The results show that the Raman intensities of rhodamine 6G (R6G) decrease with decreasing the loading concentration and that R6G loading follows the first-order adsorption kinetics . Even at a low concentration of 10 −12 M, the signatures of R6G in Raman spectrum are still clearly observed. It indicates that the silver triangular platelets (i.e. AgTP) can offer sufficient active sites to efficiently capture the R6G molecules from the loading solution, and exhibit high SERS sensitivity. In addition, the relative standard deviation (RSD) of band at 1650 cm −1 is calculated to be 13.7%, 12.7%, 15.7%, 15.1%, 13.3%, and 13.1%, respectively, corresponding with the concentration of R6G from 10 −6 M to 10 −12 M, which reveals the nanometer-scale AgTP can provide abundant hot spots and exhibit excellent reproducibility. This method offers an easy and low-cost way to prepare AgTP substrates and makes SERS detection more practicable.
研究领域:
纳米材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 110
·90457-90465
·
IF 3.84
Shicai Xu,Jihua Wang,Yan Zou,Hanping Liu,Guiying Wang,Xiumei Zhang,Shouzhen Jiang,Zhen Li,Dongyan Cao,Rongxia Tang
An efficient surface enhanced Raman scattering (SERS) substrate of graphene-isolated Ag nanoparticle (G/AgNP) has been developed by using excimer laser to ablate the ordered pyrolytic graphite in high vacuum onto Ag nanoparticles. By combining the electromagnetic activity of AgNPs and unique physical/chemical properties of graphene, the G/AgNP substrates shows high performance in terms of sensitivity, signal-to-noise ratio and reproducibility. The average enhancement factor obtained from the G/AgNP substrates for rhodamine 6G probe molecules is over 108. The maximum deviations of SERS intensities from 20 positions of a same SERS substrate are in the range of 4.20% to 6.75% and from 20 different substrates in various batches are in the range of 4.43% to 7.71%, depending on different vibration modes. As a practical application of this SERS system, we detect the adenosine concentration in human serum. The detection results show a good linear correlation between SERS intensity and adenosine concentration within the range of 2 to 200 nM. This work may open up new opportunities in developing the applications of SERS in biomedical diagnostics, biological sensing and other biotechnology.
研究领域:
生物医学诊断
·
生物传感
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Guanjian Nie,Zhuonan Huang,Shukai Ding,Xiaodong Hao,Guoquan Suo,Di Han,Yang Xu,Yingjun Yang,Wenqi Zhao,Qingmei Su,Bingshe Xu,Gaohui Du,Christophe A. Serra
Potassium-ion batteries have attracted substantial interest due to abundant resources and comparable electrochemical performance with lithium-ion batteries. Although plenty of graphene-based materials with ultrahigh performance have been designed, in practice, the dendrite growth induced by the capacitive-dominated potassium storage mechanism and the poor repeatability resulting from the complicated process are worrisome. To address these issues, it is envisaged that embedding SnCo nanoalloys in a graphene nanosheet matrix (SnCo NAs/G) can be an effective strategy for the following two reasons: (1) The embedded SnCo NAs are responsible for expanding the interlayer space and facilitating the potassium-ion diffusion in a graphene nanosheet matrix and (2) the combination of the microfluidic technology and the organic molecule confinement reaction endows the repeatability and large-scale production. As a result, the SnCo NAs/G-L anode is prepared with a low content of SnCo NAs (9.16 wt %). It shows advantages in the electrochemical performance as compared to the graphite anode. A reversible specific capacity of 165 mA h g–1 at 50 mA g–1 over 100 cycles is exhibited by SnCo NAs/G-L. It has a retention capacity of 179 mA h g–1, that is, 78.8% is recovered after charging at 500 mA g–1. Moreover, the intercalation reaction as the dominant potassium storage mechanism is beneficial for avoiding the safety problems arising from potassium dendrite growth. More interestingly, graphite-based composites constructed by the microfluidic technology successfully prove the high potential for large-scale production.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Shaoyun Chen,Qi Li,Du Tian,Pai Ke,Xinxin Yang,Qingyun Wu,Jian Chen,Chenglong Hu,Hongbing Ji
Silver nanowires (AgNWs) as a promising surface-enhanced Raman spectroscopy (SERS) substrate could be used in the analytical science due to its high sensitivity. However, it is difficult for the randomly-distributed silver nanowires to offer uniform “hot spots” to achieve the SERS signal reproducibility of small molecules detection. Herein, the evaporation-induced aggregation had been used to assemble long silver nanowires into highly aligned structure to achieve uniform “hot spots” for SERS detection. The normal glass slide with well-aligned silver nanowires could act as a high sensitivity and excellent reproducibility SERS substrate to provide a versatile platform for detecting analytes. Rhodamine 6G (R6G) is used to evaluate the sensitivity and reproducibility of these AgNWs SERS substrates. Even the low concentration of the R6G was 10 -10 mol/L, the SERS features of R6G could be still observed clearly, and the uniform distribution of enhancement factor ( EF ) was higher than 0.8 × 10 4 accounting for about 75 % in the observed mapping area. Moreover, the relative standard deviation (RSD) of SERS intensity at the band of 610 cm −1 was used to estimate the signal reproducibility, and the calculated RSD value of aligned AgNWs substrate was about 3.6%, which was much higher than that of the randomly distributed AgNWs (26.8%) because of the highly aligned structure of silver nanowires with abundant and uniform inherent “hot spots”. In addition, potential SERS detection of other small molecule, e.g. melamine was also demonstrated in the micromolar range.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Yuang Zhang,Zhuo Zang,Rongwen Lu,Shufen Zhang,Bingtao Tang
Magnetism-responsive photonic crystals can achieve contactless external-field control. Thus, they have considerable potential applications in areas such as displays, sensing, and anticounterfeiting. However, overcoming the limitations of traditional liquid systems and designing solid-state magnetically responsive photonic crystals capable of repeatable and instantaneous color change in response to a magnetic field still presents significant challenges. Herein, based on agarose-locust bean gum hydrogel (AG-LBG) and superparamagnetic Fe3O4@SiO2 nanoclusters, we propose a new strategy of fabricating a repeatable, instantaneous, chromogenic, and magnetism-responsive hydrogel (AG-LBG/Fe3O4@SiO2). The special large-pore network structure of AG-LBG endows it with internal fluidity at the microscale, ensuring magnetism-responsive reordering in the solid state of Fe3O4@SiO2. Given these features, AG-LBG/Fe3O4@SiO2 had significant potential in displays and sensing. This work provided a viable strategy for the simple and inexpensive preparation of solid-state magnetism-responsive photonic crystals.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）