ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2019
·Vol. 411
·期 18
·4221-4229
·
IF 3.286
Long Zerong,Shen Shilin,Lu Yi,Lan Wei,Chen Jia,Qiu Hongdeng
Herein, rare-earth europium doped in Gd 2 O 3 @SiO 2 -based molecularly imprinted polymer (MIP) composite nanospheres with a multilayer core-shell structure was successfully prepared via a facile and versatile layer-by-layer assembly strategy of combination with sol-gel, hydrothermal, and surface imprinting procedure. The rare-earth Gd 2 O 3 :Eu 3+ was embedded into the inner portion of the imprinted polymer which was well-suited for fluorescent monitoring carbaryl selectively. Results showed that the recognition process of the nanosensor for carbaryl was fast and reached dynamic equilibrium at ca. 20 min. The fluorescence intensity ( F 0 / F ) is linearly related to the concentration of carbaryl [ Q ] within the range of 16–80 μg mL −1 , and the linear equation is F 0 / F = 0.8909 − 9.775 × 10 −4 [ Q ] ( R = 0.9963) with 10 μg mL −1 as the detection limit. Competition experiments showed that other analogues (methomyl, aldicarb, and isoprocarb) have nearly no interference in the detection of carbaryl. Moreover, this MIP nanosensor was successfully applied to detect carbaryl in green tea samples without pretreatment. The study afforded an efficient and desirable fluorescence sensor for carbaryl detection in a complicated matrix, which hopefully will be used for biomedical/chemical sensing recognition.
Graphical abstract
研究领域:
分析化学
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材料科学
·
环境科学
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DOI
PubMed
高影响因子
Nano Research
·
2023
·Vol. 16
·期 10
·12270-12280
·
IF 9.9
Jiang Fengyang,Lan Tian,Sun Jiaqiang,Zhao Guofeng,Lu Yong
The gas-phase dehydrogenation of 1,6-hexanediol (1,6-HDO) to ε-caprolactone (ε-CL) over the high-performance Cu-based catalysts is highly desirable, but with grand challenges, because the Cu nanoparticles (NPs) are easy to be sintered with the low Hüttig temperature (< 150 °C vs. > 250 °C of reaction temperature). Herein, we report a highly efficient silica-encapsulated nano-Cu catalyst (Cu@SiO 2 /SiO 2 ) prepared via a complexation-impregnation method for the dehydrogenation of 1,6-HDO, exhibiting a 1,6-HDO conversion of 95.3% and ε-CL selectivity of 80.0% at 270 °C. The catalyst also has the outstanding thermal stability (without sintering up to 270 °C for 100 h on stream), which can be attributed to the effective encapsulation of the SiO 2 shell. In addition, the reaction network of 1,6-HDO dehydrogenation is proved. Finally, the pyridine-diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and in-situ X-ray photoelectron spectroscopy (XPS) reveal that the Cu 0 species favor the conversion of 1,6-HDO to ε-CL. The synergistic effect of Cu + and Cu 0 benefits the conversion of ε-CL to 2-methylcyclopentanone (2-MCPN). This study is beneficial for designing the high-performance Cu-based catalysts for 1,6-HDO to ε-CL, understanding the reaction network of 1,6-HDO dehydrogenation over the Cu-based catalysts, and offering a strong foundation for the large-scale production of ε-CL.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2024
·Vol. 35
·期 20
·1-9
·
IF 2.8
Yan Caibo,Su Zhiwei,Zhao Zhuo,Zhou Yanwen
Leveraging the conductivity of In 2 O 3 and the wear resistance and anti-corrosion behaviour of SiO 2 and TiO 2 , In 2 O 3 , In 2 O 3 /SiO 2 and In 2 O 3 /TiO 2 films were prepared via magnetron sputtering to meet the transparency, conductivity, wear resistance and corrosion resistance requirements for external screens of wearable devices. The films exhibited excellent sheet resistance of 13–28 Ω·sq −1 , which fully met the conductivity criteria. Owing to the light interference effect, the average transmittance of the In 2 O 3 film (77%) was higher and lower than those of the In 2 O 3 /TiO 2 (69%) and In 2 O 3 /SiO 2 (83%) films, respectively. After soaking in sweat solutions for 48 h, the In 2 O 3 and In 2 O 3 /SiO 2 films maintained their optical and electrical properties and the In 2 O 3 /TiO 2 film was partially peeled off in the acid solution. The low transmittance and corrosion resistance of the In 2 O 3 /TiO 2 film were due to severe oxygen deficiency in the TiO 2 layer, indicated by the certain amount of Ti 2 O 3 and metal Ti in XPS. The wear failure time of the In 2 O 3 /SiO 2 film (42 h) was greater than those of the In 2 O 3 (30 h) and In 2 O 3 /TiO 2 (24 h) films because of its hard SiO 2 top layer. Based on the ‘parallel sheet resistance principle’, the resistivity of the double-layer films was mainly attributed to the conductive In 2 O 3 layers. The wear and corrosion resistances were ascribed to the top passive transparent layers, in which the SiO 2 layer showed its excellent optical and electrical performance stabilities before and after corrosion and wear resistance functions. With its commonly high transparency and conductivity as well as its high wear and corrosion resistances, the In 2 O 3 /SiO 2 film exhibits application potential for external screens of wearable devices.
研究领域:
材料科学
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纳米技术
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DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Bo Xiang,Luyao Xu,Yufei Li,Liyuan Jiao,Rong Zhang
Thermochromism and radiative cooling have received extensive attention as two popular research areas in recent years. However, how to effectively combine the two remains a challenge. Herein, we present a well-designed polymethylpentene (TPX)/silicon dioxide (SiO2)/thermochromic microcapsule (TSTM) hybrid film, which effectively integrates both thermochromic and radiative cooling capabilities. Notably, the thermochromic capability gives the TSTM film excellent anticounterfeiting performance by inducing a temperature-dependent change in solar transmittance. Furthermore, the TSTM film exhibits a high average infrared emittance (ˉεIR) value of ∼94% at low temperatures and achieves a cooling effect exceeding 5C under a solar intensity (Isolar) of ∼900 W m–2, indicating an excellent radiative cooling property and potential for effective low-temperature preservation under sunlit conditions. Additionally, the TSTM film demonstrates outstanding durability, while a simple and straightforward fabrication process allows for large-scale production. Such a scalable, durable, and dual-functional hybrid film demonstrates an innovative and effective design, holding promise for expanding its application in the fields of anticounterfeiting and low temperature preservation.
研究领域:
材料科学
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光学工程
·
能源技术
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DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
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2020
·
IF 3.784
Jinhuan Hu,Guo Jiang
Passive anti-icing and active deicing have been combined to improve the anti-icing performance of substrate surface in recent years. Some researchers have prepared active deicing coatings by inducing particles with photothermal or magnetic thermal properties. However, the thermogenesis of these coatings can weaken due to loss of particles. In this work, we first take advantage of the photothermal properties of iodine in deicing process, using polymer substrate doped with iodine by heating to endow the substrate with a photothermal property. Superhydrophobic SiO 2 /SiC coatings with passive anti-icing properties were fabricated on the iodine-doped substrate by a simple spray coating method. The prepared surface of samples can warm up to melt the ice under the irradiation of near infrared light and possesses excellent water repellency with a contact angle up to 162°. The results of 3D profile and microstructure observed via scanning electron microscopy demonstrate that the coatings combined with microscale SiC and nanoscale SiO 2 form voids that can capture air pockets. The photothermal effect of substrate-iodine was demonstrated as the surface temperature of the coatings rapidly increased to about 200 °C upon 10 s of irradiation. The concept of harnessing the iodine doping substrate to achieve superior photothermal performances in deicing might shed new light on the development of anti-icing materials for various applications.
研究领域:
材料科学
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表面工程
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DOI
高影响因子
IEEE JOURNAL OF QUANTUM ELECTRONICS
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2020
·Vol. 56
·期 3
·1-9
·
IF 2.384
Zong-Tao Li,Jie-Xin Li,Jia-Sheng Li,Zi-Hao Deng,Yue-Hua Deng,Yong Tang
The scattering effect plays an important role in improving the optical performance of the quantum dot (QD) white light-emitting diodes (LEDs). A majority of the previous studies have focused on the planar packaging structure only with respect to total internal reflection (TIR). In this study, SiO2 nanoparticles are incorporated into QD-silicone encapsulation of LEDs with semi-spherical lens packaging (SSLP) to exploit their scattering effect. The results show that the radiant efficacy (31.35%@100 mA) and luminous efficacy (87.56 lm/W@100 mA) of QD white LEDs can be optimized using SiO2 nanoparticle concentration (0.1 wt%) and that they increase by 5.04% and 11.08%, respectively, as compared to the conventional structure. A comprehensive ray-tracing simulation validates that the nanoparticles in the SSLP structure lead to severe loss of chip light. On the contrary, the fluorescence light increases due to the enhancement of conversion by QDs. The transmission electron microscopy images and the finite-difference time-domain simulation have been introduced to investigate the surface adsorption of SiO2 nanoparticle. This study indicates that SiO2 incorporation is an effective method to improve the efficiency of QD white LEDs, and provides a better understanding on the scattering effect based on TIR, color conversion, and surface adsorption.
研究领域:
光学
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材料科学
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Yangyang Yu,Yingming Zhu,Jing Guo,Hairong Yue,Hegui Zhang,Changjun Liu,Siyang Tang,Bin Liang
TiO2 pigments are widely used in paint industries. Inert coating layers were usually deposited on the TiO2 pigments to suppress the photocatalytic activity of TiO2, which can prevent the degradation of surrounding polymer molecules. However, the traditional wet chemical methods normally form thick films, which would impair the pigment properties of TiO2. In this work, SnO2 and SiO2 protective layers were grown on the TiO2 particle surface by low-temperature pulsed chemical vapor deposition. At temperatures <60 °C, thin and uniform amorphous SnO2 films were obtained. The photocatalytic activities of both TiO2/SnO2 and TiO2/SiO2 core–shell particles were suppressed, and TiO2/SnO2 core–shell particles showed higher lightening power than TiO2/SiO2. According to transient fluorescence, photocurrent, and electrochemical impedance spectroscopy measurements, the low electron mobility of amorphous SnO2 and SiO2 films led to fast recombination of photogenerated electrons and holes, thus preventing their migration to the surface and suppressing the photocatalytic activity of TiO2.
研究领域:
材料科学
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表面化学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 133
·期 6
·
IF 1.768
Maolin Li,Yuhua Zhong,Zheng Wang,Andreas Fischer,Florian Ranft,Dietmar Drummer,Wei Wu
A novel flame-retardant composite was prepared by introducing a phosphorus-nitrogen flame retardant and DOPO-SiO 2 into PA6. DOPO-SiO 2 was synthesized successfully in a one-step process. PA6/OP1314/DOPO-SiO 2 achieved a UL 94 V-0 rating with an LOI value of 31%. The maximum mass loss rate of decomposition decreased significantly and char residue increased to 11.6 wt % compared with that of pure PA6. The compacted and dense char was formed due to the combination of the P-N flame retardant and DOPO-SiO 2 . The complex viscosity of PA6/OP1314/DOPO-SiO 2 increased considerably which tend to prevent the dripping phenomenon. The flame-retardant mechanism of PA6/OP1314/DOPO-SiO 2 was also investigated by Fourier transform infrared spectroscopy FTIR at different temperatures and the pyrolysis products were investigated by pyrolysis gas chromatography/ mass spectrum (Py-GC/MS). It was assumed that DOPO-SiO 2 and the hypophosphite of OP1314 possess excellent flame retardancy during the gaseous phase. Meanwhile, melamine and phosphate reacted with the pyrolytic products of PA6 to protect the matrix during the condensed phase. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 42932.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
Materials
·
2025
·Vol. 18
·期 21
·4828
·
IF 3.2
Jingwen Wang,Zunzhi Liu,Jingmei Zhang,Yang Liu,Chunjing Hou,Hui Cheng,Yaru Wang,Xiang Liu
This study introduces a novel fabrication method for high-strength, self-cleaning photocatalytic membranes through the integration of hot-pressing and TiO2/chitosan/SiO2nanofibers. The innovation of this research lies in the hot-pressing technique, which significantly enhances the mechanical properties and photocatalytic efficiency by improving the adhesion, dispersion, and uniformity of the TiO2/chitosan coating on SiO2nanofibers. SiO2nanofibers with an initial diameter of 0.79 ± 0.29 μm were coated and hot-pressed, resulting in a final diameter of 1.07 ± 0.57 μm, which corresponds to an approximate increase of 35.4%. In addition, the 1 wt% TiO2-CTS sample showed the highest adhesion and surface energy, with values of 0.1 nN/nm2, indicating the closest intermolecular binding. 3 wt% SiO2-CTS exhibits a maximum hardness of 5.23 Pa. The 3 wt% TiO2-chitosan coating demonstrated outstanding mechanical performance, achieving a fracture stress of 0.53 MPa, approximately five times that of the untreated SiO2nanofibers, a Young’s modulus of 0.63 MPa, and a toughness to triple of 0.27 MJ/m3—representing substantial improvements over uncoated membranes. Photocatalytic efficiency was significantly enhanced, with grayscale values increasing approximately 36% UV light exposure, indicating the superior degradation of pollutants.
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PubMed
高影响因子
Colloid and Interface Science Communications
·
2022
·
IF 5.633
Zhiguo Zhang,Zilong Guo,Wensheng Yang
Coating silica on Au particles has been known to be effective to improve their stability and performance. In this work, we demonstrated a cetyltrimethylammonium bromide (CTAB) assisted approach for preparation of Au@SiO 2 particles in ethanol/water mixtures. At ethanol content of 0.25, Au particles were well dispersed, while at ethanol content of 0.50, the aggregated Au particles were gradually dispersed with increasing CTAB concentration, attributed to the gradual formation of CTAB bilayer on the particle surface. When tetraethyl orthosilicate and ammonia were added directly to the Au particle dispersions, the Au@SiO 2 particles formed at the low ethanol content (0.25) were red in color and spherical in shape with a core composed of single Au particles, and these formed at the medium ethanol content (0.50) were purple in color and fractal-like in shape with a core composed of multiple Au particles.
研究领域:
材料科学
·
纳米技术
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DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Jian Gao,Jie Zhang,Honghui Guo,Ziyu Liang,Fuyong Liu,Kaiyuan Xiao,Wei Li,Hong Yan,Ruijie Guo
SiO 2 was hydrophobically modified using vinyltrimethoxysilane (VTMO), then modified SiO 2 NPs were grafted onto poly(butylene adipate- co -terephthalate) (PBAT) matrix. The modified PBAT composite films were prepared by the solvent evaporation method. FTIR、EDX and XPS analyses were performed to study the chemical structure of the modified films. The hydrophobic surface morphology was studied by SEM. The UV-blocking properties of the films were studied by UV spectroscopy. The effects of the hydrophobically modified SiO 2 on the hydrophobicity, mechanical properties, barrier properties, and antibacterial adhesion properties of PBAT were investigated. Results showed that optimum performance was achieved when the SiO 2 content was 2%. The contact angle increased from 66° to 146°. The mechanical properties decreased slightly. The barrier properties were also improved. The inhibition rates for E. coli and S. aureus reached 99%. All the results proved that the modified PBAT-based films could be used as food packaging films.
研究领域:
材料科学
·
食品科学
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Xinke Li,Xinru Wang,Xing Wang,Hanwen Xin,Xujie Yang,Jinghui Zhou,Dayin Sun
Properly cleansing the skin surface plays a crucial role in maintaining the overall body health. Incorporating nanoparticles into skincare products can enhance deep cleansing applications of the skin within the complex system formed by epidermal secretions. This study presents a nanoparticle cleansing tool, namely, patchy structure lignin composite nanoparticles. Lignin, a natural polymer, exhibits the ability to self-assemble into ultrasmall nanosized particles when exposed to a suitable solvent. Meanwhile, the surface of traditional SiO2 clean powder can be modified using rapid grafting techniques to create patchy structures. When these nanoparticles, featuring a patchy microconvex structure, come into contact with the skin, they exhibit stronger friction performance compared to hydrated silica with a smooth surface. As a result, an interlocking state forms among the nanoparticles, facilitating the removal of complex skin systems through the formation of a nanoparticle chain network. This ultimately leaves the skin cleaner and fresher. The unique composition and structure of these patchy composite nanoparticles provide an innovative approach to the development of cleansing products.
研究领域:
材料科学
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生物学
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皮肤病学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）