ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2014
·Vol. 406
·期 28
·7213-7220
·
IF 3.578
Gao Lin,Wang Jixiang,Li Xiuying,Yan Yongsheng,Li Chunxiang,Pan Jianming
In this study, we report here a general protocol for making core-shell magnetic Fe 3 O 4 /SiO 2 -MPS/MIPs (MPS = 3-(methacryloxyl) propyl trimethoxysilane, MIPs = molecularly imprinted polymers, Fe 3 O 4 /SiO 2 -MPS as core, MIPs as shell) via a surface molecular imprinting technique for optical detection of trace λ -cyhalothrin. The fluorescent molecularly imprinted polymer shell was first prepared by copolymerization of acrylamide with a small quantity of allyl fluorescein in the presence of λ -cyhalothrin to form recognition sites without doping. The magnetic Fe 3 O 4 /SiO 2 -MPS/MIPs exhibited paramagnetism, high fluorescence intensity, and highly selective recognition. Using fluorescence quenching as a detecting tool, Fe 3 O 4 /SiO 2 -MPS/MIPs were successfully applied to selectively and sensitively detect λ -cyhalothrin, and a linear relationship could be obtained covering a wide concentration range of 0–50 nM with a correlation coefficient of 0.9962 described by the Stern-Volmer equation. The experimental results of practical detection revealed that magnetic Fe 3 O 4 /SiO 2 -MPS/MIPs as an attractive recognition element was satisfactory for determination of trace λ -cyhalothrin in honey samples. This study, therefore, demonstrated the potential of MIPs for detection of λ -cyhalothrin in food.
研究领域:
分析化学
·
食品安全
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2024
·
IF 4.3
Xutong Duan,Yongfei Wang,Ruijie Guo,Baolong Niu,Huifang Wang,Hong Yan
To solve the problems of poor corrosion resistance, low adhesion and poor abrasion resistance of general superhydrophobic coatings, A superhydrophobic nano-SiO 2 /N-doped carbon dots ( N -CDs) was prepared on the surface of AZ31B magnesium alloy. The electrolyte consisted of nano-silica particles and N -CDs dispersion, where nano-SiO 2 particles were innovatively added to improve the abrasion resistance of the coating. After the superhydrophobic modification by 1 H ,1 H ,2 H ,2 H -perfluorooctyltriethoxysilane (PTES), the coating exhibited a water contact angle (WCA) of 154° and a rolling angle (RA) of 7°. The analysis undertaken via potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) demonstrated improved electrochemical performance for the coated magnesium alloy samples when compared with uncoated counterparts. The assemblies formed by the coordination of Mg 2+ with the functional groups of N -CD (−NH 2 , –COOH and –OH) were electrodeposited onto the surface of the magnesium alloy matrix, achieving a dense protective film and thereby slowing down the corrosion rate. At the same time, the abrasion resistance test results indicated that the prepared coating possessed excellent abrasion resistance, possessing the ability to resist damage to the coating caused by friction to a certain extent, proposing a new idea for fabricating superhydrophobic coatings with increased abrasion resistance on Mg alloys.
研究领域:
材料科学
·
电化学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2020
·Vol. 20
·期 9
·5478-5485
·
IF 1.134
Xie Cong,Zhao Yubin,Song Yuxiang,Liu Yingjie,Wang Yaya,Yang Ping
Compared with conventional semiconductor quantum dots, hybrid SiO2 coated CdTe QDs exhibited high stability, long fluorescent lifetime, high photoluminescence quantum yields, and well biocompatibility. In this paper, CdTe QDs with tunable PL from green to red emitting were
prepared by an aqueous synthesis. A sol–gel process resulted in CdTe QDs coated with a hybrid SiO2 shell contained CdS-like clusters to obtain red-shifted PL spectra, increased PL efficiency and high stability. The clusters were formed by the reaction of Cd2+ and
S2− ions generated via the decomposition of thioglycolic acid. The clusters around CdTe cores created a core–shell structure which is very similar with traditional semiconductor core–shell QDs. After being coated with a hybrid SiO2 shell, the PL of green-emitting
naked CdTe QDs was red-shifted largely (~30 nm) while the PL of yellowemitting CdTe QDs revealed a small red-shifted (~20 nm). Furthermore, The PL of red-emitting naked CdTe QDs was red-shifted much small (less than 10 nm). This phenomenon is ascribed to the change of band gap of CdTe cores
with sizes. The red-shift of PL spectra is attributed to the CdS-like clusters around the core rather than the thickness of the hybrid SiO2 shell.
研究领域:
材料科学
·
纳米技术
·
光学
✓ 已验证
DOI
PubMed
高影响因子
Nanoscale
·
2024
·Vol. 16
·期 25
·12007-12012
·
IF 5.8
Heng Liu,Ling-Yu Lu,Yujiao Zhang,Jin Zhao,Chang Liu,Liangliang Zhu,Qing Li,Su Chen
Polyvinyl alcohol (PVA) fiber materials have gained immense recognition due to their good biocompatibility and wide applications. However, methods allowing the synergistic enhancement of mechanical strength and toughness of PVA fibers still remain a key challenge. To this end, we developed covalently cross-linked ultrastrong SiO2-loaded polyvinyl alcohol fibers via a microfluidic spinning chemistry strategy. The thermal stretching and annealing processes not only promote the ordered arrangement of molecules, but also facilitate the ring opening reaction and increase crystallinity. Thus, the resulting fiber has a high tensile strength of 866 MPa, a specific toughness of 288 J g−1 and a tensile strain of 80%. This work provides a covalent cross-linking reinforcement method to prepare ultrastrong composite fibers assisted by microfluidic spinning chemistry and thermal stretching, which would lead to the fabrication of mechanically strong fiber materials through a simple pathway.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Hu Li,Jun Guo,Chao Gao,Mingxi Pan,Congqing Yang,Yingying Peng,Hui Huang
The rapid advancement of social information substantially expands the application range of electromagnetic technology and leads to a significant increase in electromagnetic wave pollution. In this study, silver ions undergo sensitization, activation, and subsequent reduction processes, the silver shell is formed on SiO 2 matrix. Microstructure, morphology, and electromagnetic wave absorption performance of as-prepared Ag@SiO 2 and SiO 2 were explored. When the Ag content reaches 10 wt%, the shells achieve a dense coating on the matrix. The results demonstrate that the Ag@SiO 2 (10 wt%) composite achieves a remarkable reflection loss of −52.48 dB and an absorption bandwidth of 2 GHz, at an absorber thickness of 5.3 mm and a frequency of 4.96 GHz. Compared to the reflection loss of −2.5 dB exhibited by SiO 2 , it showcases excellent electromagnetic wave absorption capability. Such significantly enhanced absorption capability of Ag@SiO 2 composites can be attributed to local surface plasmon resonance behavior induced at the interface. This study elucidates the electromagnetic wave absorption mechanism of the Ag@SiO 2 composite and successfully demonstrates its potential as a high-performance composite for electromagnetic wave absorption. Consequently, it provides a feasible solution to address the challenges associated with electromagnetic pollution.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Qianchun Zhang,Yuxian Zhao,Zhaoru Ban,Li Jiang,Shan Tang
Cataluminescence (CTL) sensors are among the most simple, inexpensive, sensitive, and selective tools for gas sensing. This study presented a highly efficient and selective CTL sensor system based on mesoporous SiO2 nanomicrospheres for the quick and sensitive analysis of isobutyraldehyde. Furthermore, its response intensity was 12.7 times higher than that of a nonmesoporous SiO2-based sensor. The constructed CTL sensor exhibited a good linear range (R2 = 0.997) for detecting isobutyraldehyde, spanning 3.11–311 ppm, with a low detection limit of 1.1 ppm. This enabled successful analysis of trace isobutyraldehyde in real samples. Finally, the CTL mechanism of this sensor was further explored. This study presents an approach for the quality detection of an important volatile organic compound, isobutyraldehyde, by a mesoporous-based CTL sensor.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Green Chemical Engineering
·
2024
·
IF 9.1
Taihang Zhou,Fen Qiao,Sen Qian,Shoaib Muhammad,Haitao Li,Yanzhen Liu
In the contemporary context, tetracycline is widely utilized as a prevalent antibiotic in various facets of life. However, the excessive use of antibiotics has caused visible environmental consequences. Henceforth, the scientific community has increasingly focused on developing catalysts that exhibit exceptional efficacy in the proficient degradation of tetracycline. In this study, a novel nanomaterial was developed to encapsulate CdTe quantum dots (QDs) with a SiO 2 shell. The distinct synthesis approach generated a composite material that showed heterogeneity and considerably increased the contact area with contaminants. Consequently, the transfer of photoelectron to the SiO 2 spheres was significantly improved, leading to a more efficient separation during the catalytic process. The study investigated how different factors, such as the loading of the catalyst, the initial concentration of tetracycline, pH levels, and the wight ratio of CdTe QDs (SiO 2 + CdTe QDs) affected the effectiveness of photocatalytic tetracycline degradation. The findings indicated that the optimal degradation efficiency was observed at a catalyst concentration of 0.25 g/L and a solution pH of 9, leading to an impressive degradation rate of 96% within a mere 2 h timeframe.
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
CHEMOSPHERE
·
2024
·
IF 8.1
Yongsheng Chen,Yi Xue,Sijia Ma,Haochuan Shi,Yanru Wang,Hongqiang Ren,Ke Xu
Recent advancements in functional sponge materials have garnered significant interest due to their efficacy and cost-effectiveness in oil spill remediation. This study introduces both silane coupling agent (methyltrichlorosilane and 3-aminopropyltriethoxysilane) and nano-SiO₂ particles into the melamine sponge framework via impregnation. Additionally, polydimethylsiloxane (PDMS) serves a crucial role in curing to fuse the substrate with the coating through robust covalent bonds. The modified sponges (SiMAPs) facilitate the formation of rough surfaces comprising hierarchical structures by the deposition of nano-SiO₂ particles, while the silane coupling agents and PDMS contribute to a reduced surface energy. These SiMAP sponges maintain high stability with a water contact angle of 162.6° and demonstrate an adsorption capacity ranging from 40 to 90 times their weight in oil or organic solvents. Furthermore, they achieve a separation efficiency exceeding 98% and an oil flux of 14.38 L/m 2 ∙s in immiscible oil-water mixtures. Additionally, the sorption of trichloromethane reaches 88.1 g/g, and the separation efficiency for surfactant-stabilized emulsions containing diesel is 62.8%. Remarkably, the oil-water separation efficiency surpasses 99.8% in dynamic continuous oil-water separation cycles, as evidenced by 20 experimental trials. These results underscore the substantial potential of SiMAP-modified sponges for addressing oil pollution by enhancing oil-water separation.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 36
·1-10
·
IF 2.8
Li Heming,Wang Xinming,Wu Tao,Gong Yuze,Zhao Hongbin,Liu Zhaobin,Dastan Davoud,Ma Ke,Hu Zhizhi
Communication industry has developed relying on technological advancement in microelectronics and large-scale integrated circuits. Modified polyimide (MPI) materials with low dielectric loss, relatively simple fabrication process, and cost-effectiveness have significant social and economic benefits. In this work, 6FAPB and 6FDA were used to polymerize fluorinated PI films by thermal imidization, and SiO 2 was used to modify PI films for further obtaining low dielectric constant ( ε )/loss (tan δ ) and enhance mechanical properties. The values of dielectric constant ( ε ) and tan δ were 2.75 and 0.00491, respectively, under 10 GHz. Meanwhile, the elastic modulus of MPI films was enhanced by the SiO 2 adding process, with a maximum tensile modulus of 2.42 GPa. The results indicate that low polarity Si–O–Si bonds lead to a decrease in overall polarity of PI films and lead to tan decrease. This work provides a simple method to increase mechanical properties and reduce the dielectric constant/loss (at 10 GHz high frequency) of PI film by introducing trifluoromethyl and SiO 2 .
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2018
·Vol. 29
·期 1
·72-79
·
IF 1.754
Wang Jianfeng,Zhou Jianping,Adelihan Kuqitaer,Shen Fenglei,Li Hua
Hollow SiO 2 spheres are synthesized by using various sizes of PS spheres as sacrified templates followed removal of the PS core by calcination. Large-area 2D monolayer SiO 2 hollow spheres opals are fabricated through gas–liquid–solid interface self-assembly route base on core–shell PS@SiO 2 as structural bricks which is a simple, fast and easily large-area-fabricated. In this route, proper ratio of alcohol to water plays important role on the synthesis of core–shell PS@SiO 2 composite spheres while,the hydrophobic treatment of core–shell PS@SiO 2 composite spheres is found primarily to realize opal films floating on water surface and further to be compacted into well ordered large monolayer films. Scanning electron microscopy and transmission electron microscopy demonstrate the obtained hollow SiO 2 spheres opals are well dispersed and well-ordered into two dimensional arrays. ultraviolet–visible–near infrared (UV–vis–NIR) spectroscopy shows that transmission in visible light range increases with the added size of hollow SiO 2 spheres. In contrast to solid SiO 2 spheres opal, hollow SiO 2 spheres opals demonstrates their improved transmission due to their high porosity.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Jianfei Zhang,Chengyi Chu,Aihua Sun,Si Ma,Xuanxuan Qiao,Chongyang Wang,Jianjun Guo,Zhixiang Li,Gaojie Xu
The double-sided structural color of Fe 3 O 4 @SiO 2 NPs under external electric field was found. Corresponding colloidal suspension of Fe 3 O 4 @SiO 2 showed a highly adjustable structure color change on both sides of the display cell with the applying of electric fields. As the applied voltage increased, the color changed from red to green then to blue at positive plate, at the same time, the color changed from red to gray then to red at the negative plate. Under a certain electric field, the reflection peak move backwards within a particular range of wavelength. It may be caused by the emergence of another repulsive force-“solvation force” at small interparticle distances.
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2017
·
IF 6.065
Zhaoli Yan,Liangjie Fu,Huaming Yang,Jing Ouyang
Hierarchical porous SiO 2 -AlOOH composite nanosheets (HPSA) with a three-dimensional (3D) structure were prepared from two-dimensional (2D) layered mineral kaolinite (A1 2 Si 2 O 5 (OH) 4 ) via a template-free structural reorganization method. The obtained material was subjected to homogeneous and effective amino-functionalization by grafting it with (3-aminopropyl) triethoxysilane. Owing to the enhanced 3D hierarchical meso-macroporous structure containing highly dispersed protonated amino groups ( NH 3 + ), the as-prepared amino-functionalized HPSA (NH 2 -HPSA) showed unique adsorption performance towards the congo red anionic dye. It provides feasibilities to fabricate other functional hierarchical porous materials from clay minerals, which can offer potential applications in adsorption, separation, catalysis and other environmental remediation fields.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）