MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 3
·961-968
·
IF 4.58
Dong Tiantian,Tang Qinghui,Zhao Kang,Deng Anping,Li Jianguo
The authors describe a dual signal amplification electrochemiluminescent (ECL) immunoassay for ultrasensitive determination of the β-adrenergic agonist salbutamol (SAL). It is based on the use of gold nanoparticles (AuNPs) and silica-coated quantum dots of the type CdSe@SiO 2 . The CdSe@SiO 2 nanoparticles (NPs) were synthesized by water-in-oil reversed-phase microemulsion. Amino-modified NPs were then prepared and used as an ECL signal probe for detection of SAL in the presence of K 2 S 2 O 8 . The gold NPs with their large specific surface carry the antigen, facilitate electron transfer and improve the electrochemical reaction efficiency of QDs and K 2 S 2 O 8 . The ECL immunosensor was fabricated by coating the AuNPs with antigen, and then SAL competed with SAL antigen for the binding sites of the antibody on the CdSe@SiO 2 NPs. Under optimized conditions, the ECL intensity is linearly related to the logarithm of the SAL concentration in the range from 0.001 to 1000 ng mL −1 , with a lower detection limit of 0.17 pg mL −1 (at an S/N ratio of 3). The assay has good operational stability, is highly sensitive and selective. It is judged to possess a wider scope in that it may be applied to many other small molecule analytes for which adequate antibodies are available.
Schematic of a dual signal amplification electrochemiluminescent immunoassay for ultrasensitive detection of the β-adrenergic agonist salbutamol based on the use of gold nanoparticles and CdSe@SiO 2 .
研究领域:
分析化学
·
生物医学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 15
·3273
·
IF 5
Bifeng Fan,Junjie Yang,Lin Cao,Xiao Wang,Jie Li,Yingfei Yang,Qiwei Wang,Peng Zhang,Florin Vogel,Wei Li,Zhidan Lin
Due to green development in recent years, water-borne epoxy resins (WBE) have become increasingly popular since they generate the lowest level of volatile organic compounds (VOC) during curing. However, because of the large surface tension of water, it is easy to produce voids and cracks during the curing process of the coating. An electrochemical strategy was used in this study to assess the impact of different SiO2content on the corrosion performance of a WBE coating, in which micron spherical SiO2particles were synthesized in a liquid phase reduction. The results showed that the synthesized micron spherical SiO2particles were about 800 ± 50 nm in diameter and in an amorphous state. By hydrophilizing the surfaces of these SiO2particles, uniform dispersion in an aqueous solvent and a WBE can be achieved. It is important to note that adding a small or excessive amount of SiO2to a coating will not improve corrosion resistance and may even reduce corrosion resistance. With the appropriate modification of SiO2, corrosion resistance of composite coatings is greatly enhanced, as is the adhesion between the coatings and the metallic substrates. Because the appropriately modified SiO2can effectively fill the pores that are formed during the curing process, a corrosive medium is less likely to react with the matrix when the medium comes into contact with the matrix. Based on their incorporation content of 3 wt.%, their corrosion resistance is the best after 16 cycles of AC-DC-AC accelerated corrosion tests.Keywords:water-borne epoxy resin;micron SiO2filler;corrosion resistance;AC-DC-AC test
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 11
·7213-7225
·
IF 5.044
Zhang Jing,Bao Yan,Guo Mingyuan,Peng Zhenghua
Poor water solubility of cellulose acetate is a key factor limiting its application in leather finishing field. Herein, a self-emulsifying aqueous emulsion was synthesized by using cellulose diacetate (CDA) as the substrate, dimethylolbutyric acid (DMBA) as the hydrophilic agent, and hexamethylene diisocyanate (HDI) as the bridging agent. Because the flexible carbon chain of HDI has the advantages of easy bending and deformation, the problem of large steric hindrance and low reactivity of -OH during water-based CDA can be solved by using the method of converting reactive functional groups and transferring reactive sites. At the same time, the flexible molecule 1,4-butanediol (BDO) and propylene glycol polyether (N210) are used as chain extenders to increase the molecular stretch and curl ability by adjusting the ratio of molecular soft and hard segments, and improve emulsion stability and coating flexibility. And through the reaction of -NH 2 and -NCO on the surface of nano SiO 2 modified by KH550, the nano SiO 2 is evenly distributed in the CDA water-based polymer to improve the comprehensive performance of the emulsion coating. Thus the nano-SiO 2 modified cellulose acetate water-based polymer emulsion (SiO 2 /WCDA) is obtained for leather finishing. The emulsion particles show an oil-in-water (O/W) core–shell structure, and the average particle size and dispersion coefficient (PDI) of the particles are 88.79 nm and 0.150, respectively. The surface of the coating film is compact, flat, and hydrophobic, with the contact angle is 104.3 °. In addition, the coating film has good adhesion, water resistance, heat resistance, yellowing resistance, chemical resistance, flexibility and mechanical properties.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Haidong Lu,Congming Tang,Xinli Li,Zhi Chen
Advanced oxidation process is powerful for removal of tetracycline (TC) from wastewater by the catalytic peroxymonosulfate (PMS) activation. It is a key to full dispersion and confinement of active centers in the catalytic system. Herein, the active Cu species were supported into mesoporous SiO 2 , which was used to activate PMS for removal of TC. Reduction temperatures revealed that the vast majority of CuO can be reduced to Cu 2 O and Cu species at 300 °C under H 2 /Ar, which offered the best performance for TC removal efficiency of 97.1 %. Noteworthily, CuO 1-x /SiO 2 -300 displayed a better activity than CuO 1-x -300, indicating that the mesoporous SiO 2 enhanced the dispersion of active Cu species. Meanwhile, the leaching Cu concentration was lower in CuO 1-x /SiO 2 -300 than CuO 1-x -300, which was also lower than that stated by WHO standard for drinking water, avoiding the secondary pollution. Due to confinement effect of mesoporous SiO 2 , CuO 1-x /SiO 2 -300 presented an excellent stability in cyclic experiments. ESR measurements revealed that rich active species such as ·OH, SO 4 ·- , O 2 ·- and 1 O 2 were generated in CuO 1-x /SiO 2 -300/PMS system. Quenching experiments revealed that these active species played an important role during the TC degradation, in which non-radical ( 1 O 2 ) pathway dominated, and the radical (·OH, SO 4 ·- and O 2 ·- ) pathway also presented innegligible influence simultaneously. This work blazed a new trail to activate PMS for removing TC from wastewater.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Dianchun Ju,Yingying Li,Bin Han,Yunjie Bao,Leyan Jiang,Hui Li,Yuxia Liu,Chunyu Chen
Heteroatom-doped graphene lamellae can effectively modulate the physical and chemical surface activities of Co 9 S 8 materials. The addition of a second dopant atom, such as nitrogen (N) can further improve the composite properties. Herein, novel nitrogen‑sulfur double-doped graphene-loaded SiO 2 /Co 9 S 8 composites (SiO 2 /Co 9 S 8 @NSG) were prepared by a one-step solvothermal method using polyethylene glycol as the carbon source and cobalt chloride hexahydrate as the cobalt source to yield a Deep Eutectic Solvents (DESs) system. The precursor was then obtained by adding tetraethyl silicate as the silicon source, thiourea as the sulfur source, and urea as the nitrogen source. The uniform distribution of Co 9 S 8 in the N/S-doped graphene matrix formed graphene-coated SiO 2 particles SiO 2 /Co 9 S 8 @NSG with high specific surface area, superior ionic conductivity, and elevated theoretical specific capacity. The N/S co-doped graphene matrix not only improved the electrical conductivity and hindered the adhesion of the particles, but also buffered the volume of the Co 9 S 8 change and enhanced the electrochemical performance. The testing of SiO 2 /Co 9 S 8 @NSG composite as an anode for lithium-ion batteries (LIBs) revealed an impressive specific capacity with reversible capacity of 850 mA h/g after 900 cycles at a current density of 0.5 A/g and multiplicative capacity of 730 mA h/g at a current density of 0.1 A/g, confirming excellent cycling stability and a Coulombic efficiency close to 100 %. Overall, the proposed doping strategy looks promising for the development of high-performance LIBs.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2020
·
IF 3.557
Ying Zhang,Hongsheng Lu,Baogang Wang,Na Wang,Dongfang Liu
A novel stimulus-responsive non-Pickering emulsion stabilized by nano-SiO2 particles was prepared in our recent study. 4-formylbenzoic acid and hexylamine through a dynamic covalent bond form a surface-active substance, which was confirmed by Fourier transform infrared (FTIR) and 1H NMR. Through optimization experiments, it was proved that a stable emulsion can be formed by low surfactant concentration (below cmc) and low nano-SiO2 particle concentration (0.5 wt %). In this emulsion, nano-SiO2 particles are not located at the interface of oil–water but dispersed in the continuous phase of the emulsion, which is different from the Pickering emulsion. The negatively charged nano-SiO2 particles and anionic surfactants repel each other, thereby synergistically stabilizing the emulsion so that the concentrations of surfactants and nanoparticles required to stabilize the emulsion are reduced. In addition, the system can also control the formation and fracture of dynamic covalent bonds by changing pH, thereby controlling the stability and demulsification of the emulsion. At the same time, this non-Pickering emulsion could be used as a microreactor for chemical synthesis and still had a high yield after three cycles. This study provides a new application direction for this environmentally friendly emulsion.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 44
·期 4
·1194-1203
·
IF 3.069
Can Huang,Fengyi Wang,Daheng Wang,Zhiguang Guo
In this study, superamphiphobic coatings, which could repel liquids with a surface tension as low as 21.6 mN m−1 (n-octane), were prepared using a spray-coating method based on a flower-like hierarchical structure and highly fluorinated TiO2/SiO2 composite particles. And the coating exhibited broad liquid repellency to water-based composites, various oils, organic solvents and hot water. Moreover, the coating also possessed remarkable mechanical and chemical stability towards various forms of mechanical damage and in harsh chemical environments. Multiple features enable the coating to find more vital applications in antifouling, corrosion resistant, fuel transportation, gas adsorption, and protective coatings, etc.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2023
·
IF 7
Di Zhang,Zhijun An,Yiwen Zhang,Yufeng Hu,Jingjing Zhan,Hao Zhou,Minghuo Wu
A continuous flow mode fixed-bed reactor (FBR) was built for the efficient degradation of triazine herbicides (THs) in wastewater, in which MoS 2 @SiO 2 composites were used as a co-catalyst for the Fe 2+ activated persulfate (PS) oxidation . The degradation activity of this MoS 2 @SiO 2 /PS/Fe 2+ FBR was evaluated by choosing atrazine (ATZ) as a model pollutant, and operation conditions were systematically optimized, including the amount of oxidant, Fe 2+ concentration, initial pH, flow rate, and coexisting interferences. The degradation results showed that MoS 2 @SiO 2 could greatly improve the degradation efficiency, and over 97.1 % of ATZ could be degraded under the optimized conditions (hydraulic residence time of 24 s). In this reaction system, sulfate radicals and hydroxyl radicals played the major roles (over 80 %) in the degradation process. Continuous treatment of 1400 mL wastewater could be achieved with 1.0 g MoS 2 @SiO 2 composite with a degradation efficiency maintained above 80 %. Four tested THs of ATZ, simazine , ametryn and prometryn could be efficiently degraded. Furthermore, the removal rate of ATZ in pond water reached 77.6 % and the mineralization rate was about 51 %, indicating this MoS 2 @SiO 2 /PS/Fe 2+ FBR was applicable in the treatment of real wastewater .
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Colloid and Interface Science Communications
·
2023
·
IF 4.5
Lihuan Wang,Feng Gan,Jinpeng Mo,Jing Zhao,Xi Yu,Hui Yu
Rare earth-doped bioactive ceramics are promising biomaterials due to their unique optical properties, biocompatibility, antioxidants, and antibacterial activity. In this study, a series of SiO 2 -CaO-Er 2 O 3 nanofiber mats were fabricated by sol-gel electrospinning. The morphology, flexibility, physicochemical and biological properties of the nanofibers were investigated. The flexibility of the nanofiber mats containing 5 and 10 wt% of Er 2 O 3 was better than that of samples without or with >10 wt% Er 2 O 3 . The chemical property assay indicated that addition of Er can lead to changes in the degree of crystallinity and the degree of silica network polymerization, which further affect the flexibility. Photoluminescent spectra showed that the Er-doped nanofibers exist green and near infrared emissions. The in vitro bio experiments demonstrated that Er-doped nanofibers present excellent biocompatibility, and the mineralization experiment demonstrated that Er-doped nanofibers present favorable mineralization activity. Therefore, these SiO 2 -CaO-Er 2 O 3 flexible nanofibers may be promising candidates for biomedical applications.
研究领域:
材料科学
·
生物医学工程
·
生物材料学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Liangyong He,Bin Yang,Sen Wang,Yuqing Yang,Yingying Wang,Haiyang Hu,Zhengzhi Zheng,Jiashuo Liu,Jiasheng Qian,Jibin Miao,Weiguo Zhang,Yuchao Ke
The increasing demand for improving the performance of optical devices and the development of nanotechnology have driven research on diffusion films. The preparation of diffusion films with well-defined microstructures can achieve uniform diffusion and scattering of light, thereby improving the efficiency and performance of optical devices. In this study, diffusion films with high transmittance and haze were prepared using PMMA@TiO2@SiO2 (P@T@S) composite microspheres, and the PMMA microspheres and nanoparticles were combined through electrostatic attraction. As compared with PMMA microspheres, the P@T@S composite microspheres displayed better heat resistance as well as swelling resistance. Optical performance data showed that the P@T@S diffusion film had the perfect optical performance with a transmittance up to 90.5% and a haze of 88.3%. The excellent light diffusion effect of the P@T@S diffusion film was experimentally demonstrated, with the light through the film not only displaying the largest area but also maintaining a relatively high brightness. Our findings can provide reference and guidance for further development of light diffusion films, which are of potential application in optoelectronic devices.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xuewu Li,Shaomeng Du,Chenghu Ma,Tian Shi,Wei Qi,Hejie Yang
Improving the corrosion resistance of widely used Al alloys is important for expanding their industrial and marine applications. Structural fragility and preparation cost have always been key factors for restricting anticorrosive application of extensively-reported superhydrophobic surface. In order to try and fight that, combining with polyurethane (PU) adhesion agent, 1H,1H,2H,2H-perfluorodecyltriethoxysilane (PFDTES) was encapsulated around nano-SiO 2 ceramics for robust coating in place of conventional structure preparation strategy on Al alloy surface. Such low-cost one-step air-spraying SiO 2 @PFDTES@PU coating was prepared by 0.03 g nano-SiO 2 ceramics addition, 100 μL PFDTES and 0.25 g PU with the highest water contact angle of 168.34° ± 2.72°, a rolling angle of 4.02° ± 2.08°, and a propylene glycol oil contact angle of 156.52° ± 3.35°. FE-SEM, laser confocal microscopy, EDS and XPS were used to investigate micro-nano morphology and chemical composition of the coating. Meanwhile, the electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization measurements showed that as-prepared coating exhibited larger capacitive arc diameter, enhanced charge transfer resistance, larger |Z| 0.01Hz value, positive shifting E corr and significantly reduced I corr , thus demonstrating a significantly improved corrosion resistance. In addition, sandpaper friction experiment was used to evaluate the mechanical stability of the fabricated superhydrophobic coating. Ultimately, its resistance to solid/liquid contamination and self-cleaning ability were also systematically assessed. This work provides strong technical supports for industrial and marine applications for such low-cost, wear-resistant and anti-corrosion coating.
研究领域:
材料科学
·
表面工程
·
腐蚀防护
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Weirui Chen,Yixiang Bao,Xukai Li,Jun Huang,Yiming Tang,Laisheng Li
Mesoporous Fe-Cu@SiO 2 core-shell catalyst was synthesized and assessed for its catalytic activity in the ozonation of salicylic acid (SA). The synthesized catalyst was characterized by XRD, TEM, SEM, XPS, H 2 -TPR, etc. Fe-Cu@SiO 2 exhibited a regular spherical shape and had the surface area at 1216 m 2 g −1 . The wrapping of metal components and their strong interaction prevented metal leaching. Fe-Cu@SiO 2 showed the highest activity for SA mineralization when compared with Fe@SiO 2 and Cu@SiO 2 . In Fe-Cu@SiO 2 /O 3 , 88% TOC was removed, which was 2.5 times as much as that in sole ozonation. SA degradation efficiency in Fe-Cu@SiO 2 /O 3 increased with initial pH. O 3 , ·OH and H 2 O 2 were the main reactive oxygen species accounting for SA mineralization. Due to their scavenging effect of ·OH, NH 4 + , NO 3 − and humic acids would inhibit the degradation efficiency of Fe-Cu@SiO 2 /O 3 . Acidic sites, oxygen vacancies and the Fe-Cu(I/II) electron transfer were responsible for ozone decomposition and ·OH generation. SA mineralization proceeded through the ·OH mechanism. Moreover, SA mineralization in O 3 and Fe-Cu@SiO 2 /O 3 both exhibited a two-stage pseudo first-order kinetics (stage I: 0–45 min; stage II: 45–120 min). The degradation intermediates were detected to investigate the reaction pathway. ORP and EEM were used to monitor the degradation process. Great difference was found for carboxylic acids accumulation in O 3 and Fe-Cu@SiO 2 /O 3 . The accelerated removal of oxalic acid and humic acid-like intermediates were responsible for the two-stage pseudo first-order kinetics.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）