POLYMER INTERNATIONAL
·
2024
·
IF 2.9
Wangui Peng,Weihong Huang,Minmin Gao,Wenming Yang,Wanzhen Xu
Sulfamethymidine, a sulfonamide commonly employed, is introduced into the human body through the food chain, posing a threat to human health. Consequently, the development of a rapid and efficient detection technique becomes imperative. In this investigation, a photoresponsive sulfamemethyridiazine imprinted polymer was synthesized to etch a silicon core, thereby effectively addressing the limitations encountered with conventional molecularly imprinted polymers, including diminished binding capacity, restricted site accessibility, and sluggish binding kinetics. The photosensitive monomer utilized in the molecularly imprinted polymers (MIPs) is 5[(4 (methylacryloxy) phenyl) diazene] mphthalic acid, which exhibits a stimulating reaction mechanism. The N=N bond undergoes photoisomerization, transitioning between trans and cis configurations. The adsorption experiment provides additional evidence that the hollow molecularly imprinted polymers exhibit a higher adsorption capacity, achieving a value of 0.192 mmol L −1 . The experiments conducted to assess selectivity and repeatability confirm that the photoresponsive MIPs exhibit a high level of selectivity and favorable repeatability. Following four cycles, the adsorption rate consistently remains at 64.3%. After undergoing four cycles, the adsorption rate remains consistently at 64.3%. Additionally, the recoveries of the actual samples ranged from 95.6% to 99.7%. This finding presents a novel approach to detecting the concentration of trace pollutants in intricate substrates. This article is protected by copyright. All rights reserved.
研究领域:
分析化学
·
环境科学
·
药学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Tong Feng,Kaicha Chen,Jiamiao Zhong,Yaxin Cheng,Hongli Zhao,Minbo Lan
Arsenic(III) is a highly toxic pollutant in the environment, and the development of nanomaterials with high electrochemical activity for As(III) detection is a research focus at present. Herein, an electrochemical sensing platform based on polyaniline nanofibers embedded with Ag@SiO 2 nanoparticles (Ag@SiO 2 /PANI NFs) was successfully constructed for trace As(III) determination. Owing to an in-situ chemical oxidation polymerization strategy, the polyaniline nanofibers loaded with Ag@SiO 2 core-shell nanoparticles blossomed into the dendritic three-dimensional network. The unique structure with a huge specific surface area greatly enhanced the adsorption efficiency of As(III). Combined with the outstanding conductivity of polyaniline and the electrocatalytic ability of uniformly dispersed AgNPs, the stripping current signal of As(III) was further amplified. Based on the optimized conditions, the sensitivity of 0.83 μA μg −1 L was obtained in the linear range of 0.1 ~ 100 μg L −1 with a low detection limit of 0.013 μg L −1 . And the selectivity, reproducibility, and long-term stability of this sensor were excellent. Additionally, satisfactory results were achieved by the recovery experiment of real samples, and the accuracy of this method was verified by comparison with ICP-MS. The above results demonstrated the promising application of the as-fabricated sensor in As(III) detection.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Tingting Zhang,Huimin Zhao,Xie Quan,Shuo Chen
An electrochemiluminescence (ECL) sensing for sensitive assaying of active DNA glycosylase was developed using the enhanced host-guest recognition technique. The α-cyclodextrin was selected as the host molecule which captured the guest-labeled ECL probe to the surface of electrode by the host-guest recognition. The ECL probe can be protected from the digestion of exonuclease I (Exo I) and exonuclease III (Exo III) with the presence of the target enzyme human 8-oxoguanine DNA glycosylase 1 (hOGG 1), resulting in the ECL emission intensity was correlated with the quantity of hOGG 1. The α-cyclodextrin functionalized gold/silica (Au/SiO 2 ) cell-shell nanoparticles was prepared to enhance the host-guest recognition sensitivity. Because of the increased recognition sites provided by α-cyclodextrin functionalized Au/SiO 2 cell-shell nanoparticles, the nanoparticle-modified electrode displayed a high capacity for the guest ECL probe, and four fold enhancement of the ECL signals was achieved. The as-prepared ECL sensing exhibits excellent analytical property for the detection of hOGG 1 in the linear range of 2–100 U mL −1 with a detection limit of 0.225 U mL −1 (S/N = 3). Interference tests show that the ECL intensity of the interferents human apurinic/apyrimidinic endonuclease (APE 1), T4 endonuclease V (T4 PDG) and endonuclease III (Endo III) is within 36.5 to 44.7% of that of hOGG 1. The ECL sensing exhibits long-term stability with a relative standard deviation (RSD) of 1.6% for 16 cycles of continuous potential scans, and the life time of the ECL sensing is up to 20 days. The obtained results in this study indicate that the proposed ECL sensing possesses high sensitivity, specificity and stability and provides a powerful tool for assaying hOGG 1 activity.
研究领域:
生物化学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Xuefeng Wang,Hua Wang,Shengyu Feng
“Silicon-cored” compounds are well known for their high value glass transition temperature, high thermal stability and excellent optical properties, but the excellent optical properties was not used for fluorogenic probes especially for Fe 3+ probe. In this paper, a novel Fe 3+ probe based on thiophene functionalized silane, namely, bis[3,4-diphenyl-2,5-di(2-Thienyl)phenyl]methylphenylsilane (MPS) was designed and synthesized. MPS exhibits aggregation-induced emission enhancement (AIEE) property in water/tetrahydrofuran mixtures because of restricted intramolecular rotation. The abnormal optical properties enable MPS to detect Fe 3+ in aqueous-based solutions. The binding behavior of MPS aggregates to Fe 3+ and other transition metal ions were studied through UV–vis, fluorescence spectroscopy, and scanning electron microscopy. Exceptional fluorescence quenching of MPS occurred during Fe 3+ binding. The calculated detection limit was at ppb level, and the complex ratio of MPS to Fe 3+ is approximately 1:1. MPS has both exemplary activity and high selectivity toward Fe 3+ even in the presence of other metal ions. The test conditions were also expanded from water to bovine serum albumin and solid films. This study was an advancement for the application of “silicon-cored” compounds and provides guidance for using simple, low-cost, and high-selectivity Fe 3+ probes in aqueous solutions and in clinical applications.
研究领域:
化学
·
材料科学
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2018
·
IF 3.909
Jiandong Cui,Baoting Sun,Tao Lin,Yuxiao Feng,Shiru Jia
Enzyme immobilization on the external surface of solid supports is a commonly adopted method to improve stability and reuse for continuous operations, which, however, is prone to cause the enzyme denaturation due to no carriers protection. Herein, we describe enzyme-shielding strategy to prepare hybrid organic/inorganic nanobiocatalysts; it exploits the self-assembly of silane building blocks at the surface of immobilized enzymes on Fe 3 O 4 /silica core-shell nanospheres to grow a protective silica layer. The silica shell around the immobilized enzyme particles provides a “shield” to protect from biological, thermal and chemical degradation for enzyme. As a result, the recycling of the immobilized catalase with a protective silica layer was improved remarkably compared with immobilized catalase without a protective silica layer. The immobilized catalase with a protective silica layer still remained 70% of their original activity after 9 cycles, whereas the immobilized catalase without a protective silica layer only retained 20% of their original activity. Moreover, the immobilized catalase with a protective silica layer exhibited significantly enhanced resistance to denaturing stresses (such as proteolytic agent, denaturants, and heat). Therefore, the enzyme-shielding strategy showed promising applications for preparing obtain stable and recycled nanobiocatalyst.
研究领域:
纳米生物技术
·
酶工程
·
材料科学
·
生物催化
·
药物递送系统
✓ 已验证
DOI
高影响因子
FUEL
·
2018
·
IF 4.908
Lei Yue,Jiamao Li,Chao Chen,Xiaolong Fu,Yu gong,Xiulong Xia,Jingwei Hou,Chengjian Xiao,Xiaojun Chen,Linjie Zhao,Guangming Ran,Heyi Wang
Dry reforming of methane (DRM) reaction is an environment-friendly process to convert greenhouse gases, methane (CH 4 ) and carbon dioxide (CO 2 ) into synthesis gases for industrial application. However, the catalysts used for DRM reaction always deactivate at high temperatures due to the sintering of metal nanoparticles and coking on the active surface. Core-shell structures composed of metal cores surrounded by oxide shells (core-shell structures) have been confirmed to be thermal-stable by solving the two problems. Pd@SiO 2 core-shell nanocatalyst has been prepared by using a sol-gel process, along with two supported catalysts prepared by using impregnation method in this work. The catalysts were characterized by using transmission electron microscopy (TEM), X-ray diffraction (XRD), N 2 adsorption-desorption isotherms, CO chemisorption, inductively coupled plasma optical emission spectrometry (ICP-OES). The Pd@SiO 2 after thermal treatment at 700 °C for 6 h exhibits no obvious sintering. For DRM reaction catalyzed by Pd@SiO 2 core-shell nanocatalyst, the conversions of CO 2 and CH 4 are 89% and 83% respectively, which show no significant decrease for >10 h. However, two supported Pd catalysts (Pd cub/SiO 2 and Pd/SiO 2 ) deactivate to a very low activity (conversion lower than 20%). The results suggest that the Pd@SiO 2 nanocatalyst is excellent for DRM reaction, which also can be used for other heterogeneous catalysis reaction at high temperatures.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Jiannan Sun,Pan Zhang,Ke Yan,Aizhao Pan,Christophe Len,Weiyi Ouyang,Chengyu Shi,Xinyi Shi,Jun Hong
Quantum dots (QDs) with dual-emission property have garnered significant attention as prototype platforms for temperature measurement due to their self-calibration capabilities and high sensitivity. The assembly and property modulation of this materials hold great research value. In this work, we propose a strategy to utilize dendritic mesoporous SiO 2 core–shell spheres to encapsulate dual QDs, enabling the constructing of dual-emission fluorescent temperature sensing system. By encapsulating CsPbBr 3 and CdTe QDs in SiO 2 core–shell spheres, we developed a dual-emission temperature probe that employs two thermometry modes: peak wavelength spacing variation and fluorescence intensity ratio. This probe offers advantages such as high thermal stability, excellent fit, and high sensitivity. Additionally, inspired by the concept of series sliding resistors, we introduced a novel approach to adjust the probe’s sensitivity by treating the fluorescence intensity and peak wavelength of the dual QDs as the “sliding resistor”. This innovation results in a temperature fluorescence sensing system with tunable sensitivity. We also explored the potential applications of these probes in temperature measurement, light-emitting diodes, and fluorescent anti-counterfeiting. Our research presents an effective strategy for the rational design of high-performance dual-emission fluorescence temperature sensing systems with customizable sensitivity.
研究领域:
材料科学
·
纳米技术
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2016
·
IF 3.719
Zhenchong Zhang,Yizhuo Gu,Jiayu Bi,Shaokai Wang,Min Li,Zuoguang Zhang
Barium titanate@silicon dioxide (BT@SiO 2 ) core@shell fillers with an average diameter of 100 nm were prepared by a facile sol–gel synthesis. The thickness of SiO 2 shell can be easily tuned by varying different mass ratio of BT to tetraethyl orthosilicate (TEOS). Polyvinylidene fluoride (PVDF) based composite films reinforced by BT and BT@SiO 2 were fabricated via a solution casting method. The effects of SiO 2 shell on morphology structure, wettability , interfacial adhesion, dielectric , electrical and energy performances of composites were investigated. Compared with BT/PVDF, BT@SiO 2 /PVDF composites show significantly increased breakdown strength due to enhanced interfacial adhesion and suppressed charge carrier conduction. Benefiting from enhanced breakdown strength and reduced remnant polarization induced by SiO 2 shell, BT@SiO 2 /PVDF shows increased release energy density (energy density which can be fully discharged and applicable). Especially, BT@SiO 2 /PVDF with SiO 2 thickness of 4 nm exhibits the highest release energy density of 1.08 J/cm 3 under applied electric field of 145 kV/mm.
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 27
·8432-8441
·
IF 6.641
Jing Zhao,Chen Wu,Lipeng Zhai,Xiaofeng Shi,Xin Li,Guojun Weng,Jian Zhu,Jianjun Li,Jun-Wu Zhao
A surface-enhanced Raman scattering (SERS)-based sandwich type immunoassay was developed for the detection of α-fetoprotein (AFP) with high sensitivity, reproducibility and selectivity. In the immunoassay, an antibody immobilized nitrocellulose (NC) membrane was employed to capture AFP and antibody conjugated silica coated gold/silver core–shell nanostars (AuNS@Ag@SiO2) were used as SERS probes. AuNS@Ag was synthesized by the direct deposition of Ag on the AuNS. The Ag shell grew outward from the center towards the tips and adopted a polyhedral shape. The AuNS@Ag nanoparticles were shown to have higher SERS activity than gold nanostars (AuNSs), and their LSPR wavelengths could be finely tuned across a wide spectrum ranging from visible to near-infrared by simply adjusting the Ag shell thickness. The silica coating improved colloidal stability of the nanostructure and provided functionality for antibody conjugation. By using 4-mercaptobenzoic acid (4-MBA) as a Raman reporter molecule, the proposed SERS sensor is able to detect AFP with a low limit of detection (LOD) of 0.72 pg mL−1 and a wide and clinically relevant linear detection range from 3 pg mL−1 to 3 μg mL−1. Hence, this SERS-based immunoassay provides a strategy for the detection of trace AFP and has potential to assist in the monitoring of prognosis for hepatocellular carcinoma (HCC) patients.
研究领域:
分析化学
·
纳米技术
·
癌症研究
·
生物传感器
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2013
·Vol. 1
·期 39
·6355-6363
·
IF 0
Youlin Zhang,Xianggui Kong,Bin Xue,Qinghui Zeng,Xiaomin Liu,Langping Tu,Kai Liu,Hong Zhang
Applying the Stöber method to directly coat noble metal nanoparticles (NPs) such as gold (Au) and silver (Ag) NPs with silica shells presents challenges, since the noble metal NPs are not stable in alcoholic solution and have low chemical affinity for silica. This paper describes a method which uses 11-mercaptoundecanoic acid (MUA) as a linker molecule between the silica shell and the noble metal NPs. MUA binds strongly to the surface of the NPs via a metal–S bond by replacing the standard capping agents on the surface of the NPs. Upon MUA stabilization, the NPs can be transferred into alcohol solution and show chemical affinity for silica. The MUA-modified NPs can be directly coated with thickness controlled, smooth and homogeneous silica shells via the standard Stöber method by varying the amount of tetraethoxysilane (TEOS). Compared with methods reported in the literature for the coating of such particles, this method can not only be used to successfully coat citrated-stabilized Au or Ag NPs, but can also be extended to encapsulate oleylamine (OA)-stabilized Au NPs and cetyltrimethylammonium bromide (CTAB)-stabilized Au nanorods (NRs) by using MUA to displace the original ligand on the surface of the NPs. Additionally, the obtained metal@SiO2 core–shell NPs have been successfully applied as plasmonic nanoantennas for fluorescence enhancement in metal@SiO2@fluorophore NPs.
研究领域:
材料科学
·
纳米技术
·
光学
✓ 已验证
产品关联
DOI
INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Habib Ur Rehman,Shazia Ghaffar,Mujeeb Ur Rahman,Saeed Ahmed,Faakhar Raza
Arsenic as an emerging micropollutant, causing the world ecosystems polluted due to its high toxicity to the environment. In order to removal arsenate As (V), many metal organic frameworks (MOFs) have been synthesized as adsorbents. However, the mostly existing MOFs adsorbents have a slow adsorption rate, agglomeration and poor stability in water.Therefore, it is highly desired to explore a novel adsorbent for the more efficient and rapid removal of As(V) from aqueous solution. Herein, we synthesized monodisperse microspheres with amino functionalized MOF UiO-66 on the silica core for the first time.The synthesized adsorbent was charecterised using scanning electron microscopy (SEM), transmission electron microscopy (TEM), N 2 adsorption desorption isotherms, x-ray diffraction (XRD).The obtained results revealed that it exhibit monodisperse core shell microspheres and showed fast separation of As (V) from aqueous solution. The Kinetic data showed that the As (V) removed rapidly, within 5 min only and the adsorption kinetics described by the pseudo second order kinetic model.The adsorption capacity of the adsorbent was 22.62 μg/g at pH 2. The adsorption experiment showed that adsorbent prepared with UiO-66-NH 2 @SiO 2 could rapidly remove the arsenate from aqueous solution. FTIR results indicated that As (V) is removed successfully from aqueous solution. Electrostatic interaction between UiO-66-NH 2 and As (V) should be the proposed mechanism.
研究领域:
环境科学
·
材料科学
·
化学工程
·
纳米技术
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Yang Liu,Jian Li,Jiawei Liu,Changwei Tang,Quan Bai
Metal-organic frameworks (MOFs) are promising packing materials in liquid chromatography, but their micropore character extremely prevents the separation performance. Herein, we proposed an acidic etching strategy to fabricate a hierarchically porous University of Oslo-66 (HP-UiO-66) coated silica shell-core composite by using phosphoric acid as an etchant. The prepared composite, namely HP-UiO-66@silica-PA, was characterized by SEM, TEM, FT-IR, and N 2 -adsorption–desorption isotherms, demonstrating the generation of mesopores in HP-UiO-66 shell with pore width ranging in 4–5 nm. The chromatographic performance of HP-UiO-66@silica-PA-1 (etched by 1 mL phosphoric acid for 2 h) as HPLC stationary phase was evaluated in reversed-phase mode, and the separations of three groups of small solutes were studied and compared with the microporous UiO-66@silica (MP-UiO-66@silica) column. The results proved the obviously improved performances with narrower peak width, better resolution, and higher symmetry were achieved by the HP-UiO-66@silica-PA-1 column. The faster diffusion and mass transfer kinetics in the HP-UiO-66 shell signally reduce the plate height and improve the column efficiency. Specifically, the plate number of o -xylene was 18,442 plates m −1 , which was about 18.5 times higher than that on the MP-UiO-66@silica column (993 plates m −1 ). Furthermore, good repeatability and reproducibility with RSDs of both retention time and peak area less than 0.5 % confirmed the high stability and outstanding reliability of the HP-UiO-66@silica-PA-1 column. This study demonstrates that the phosphoric acid etching strategy is simple, mild, and controllable to fabricate hierarchically porous MOFs-based stationary phase for enhancing the HPLC separation performance.
研究领域:
分析化学
·
材料科学
·
色谱
✓ 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）