JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 38
·e52918
·
IF 3.057
Yukun Tian,Yongzhi Hong,Yunlong Wang,Yuan Tian,Zhihao Wang,Meixing Ai,Jun Ma
The emerging stretchable and tough hydrogels find their extraordinary contributions in widespread use. However, the applicability of existing tough hydrogels in harsh environments like highly acidic stomachs has remained a challenge. Here, we develop superior stretchable and tough P(AA -co- AAm)/SiO 2 hybrid hydrogels through radiation-induced polymerization and crosslinking in the presence of acids. The performance of the nanocomposite gels was optimized by altering fabrication variables including acid concentration, monomer composition and absorbed dose. The mechanic tests show that the protonated hybrid hydrogels displayed a high elongation at break (1919%), fracture strength (117 kPa), and compressive strength at 50% strain (126 kPa). These values are superior to those of conventional polyelectrolyte hydrogels and expect to significantly broaden the application. The proposed strategy is quite general and offers an alternative strategy to develop tough hydrogels.
研究领域:
材料科学
·
高分子化学
·
生物医学工程
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Changran Zheng,Zhoudong Yang,Baotong Guo,Hanqing Dai,Tianhe Lu,Xi Zhu,Huimin Xu,Bobo Yang,Jun Zou,Sergey Lishik,Jiajie Fan
(Sr, Ca)AlSiN 3 :Eu 2+ (SCASN) phosphors are widely used in white LEDs due to their excellent red spectral performance. However, exposure to high temperature, high humidity, and sulfur-containing environments significantly degrades their performance and long-term stability. Herein, a rapid plasma-assisted deposition technique is employed to apply an ultrathin Si-based nanolayer onto SCASN (SCASN-Coated), enhancing its durability under such harsh conditions. Accelerated aging tests conducted at 100 °C, 100 % relative humidity (RH), and in a sulfur-containing atmosphere reveal that unmodified SCASN retains only 24.1 % of its initial luminous intensity after 1008 h, whereas the SCASN-Coated preserves approximately 41.2 % of their original brightness without compromising intrinsic luminescent properties. First-principles calculations and molecular dynamics simulations further elucidate that SCASN has a strong chemical adsorption effect on SO 2 (−3.056 eV). And the combined presence of SO 2 and H 2 O promotes the displacement of Ca 2+ ions, accelerating degradation. The protective SiO 2 nanolayer drastically reduces the SO 2 adsorption energy (−0.124 eV) and inhibits Ca 2+ ion migration. This surface protection strategy not only augments the resilience of SCASN phosphors under extreme conditions but also provides research paradigm into the degradation mechanisms, thereby offering new avenues for extending the service life of LED devices in challenging environments.
研究领域:
材料科学
·
光电子学
·
表面工程
·
固态照明
·
计算化学
✓ 已验证
产品关联
DOI
高影响因子
ChemCatChem
·
2024
·
IF 3.8
Mingwei Wang,Zhen Shi,Zhiquan Yu,Shushuang Li,Zhixin Zhang,Feng Wang
Graphical The HCHO-acetaldehyde condensation is a typic aldol reaction and a critical step to produce 1,3-propanediol from methanol and ethanol. The cross condensation of HCHO and acetaldehyde to acrolein has been conducted over MgO/SiO 2 catalyst, which shows the synergistic catalysis by the acidic sites (Mg-O-Si structure) and basic sites (Mg-O-Mg structure) for activation of HCHO and acetaldehyde, respectively. Acid-base synergistic catalysis greatly enhances the performance of MgO-based catalysts in the Aldol condensation. In this paper, the effect of acid-base strength/concentration/proportion and the synergistic catalysis on the performance of cross condensation between HCHO and acetaldehyde were studied. The NH 3 /CO 2 -TPD results indicated that the weak acidic sites combined with the medium basic sites were beneficial for the cross condensation of formaldehyde and acetaldehyde. The loading of MgO nanocrystals on SiO 2 induced the generation of new acidic sites (Mg-O-Si). Combined with the inherent basic sites (Mg-O-Mg) and Mg-O-Si, the acid-base bifunctions sites could catalyze the cross condensation of HCHO and acetaldehyde synergistically. The appropriate proportion of acidic/basic sites (10/1) was critical for the cross condensation in the presence of vast water in formalin. The effect of reaction parameters, including molar ratio of substrates, reaction temperature, linear velocity and weight hourly space velocity, were investigated for the cross condensation. The results showed that 10 wt% MgO/SiO 2 catalysts exhibited the highest catalytic activity (57.9% conversion of acetaldehyde and 84.3% selectivity of acrolein) under the optimal reaction parameters among the investigated catalysts. The catalytic performance of MgO/SiO 2 could be recovered after in situ regeneration in air to remove the carbon deposition.
研究领域:
化学工程
·
催化科学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Xiao Wei,Guodan Xu,Chengcheng Gong,Fang Qin,Xinghui Gong,Chen Li
In this paper, we have presented a custom-tailored strategy to fabricate molecularly imprinted composite sensors (MIPs/QDs@SiO 2 ) with highly selective recognition ability for the determination of sulfanilamides (SAs). The modified SiO 2 sphere, modified QDs, acrylamide (AM), and ethyl glycol dimethacrylate (EGDMA) were used as the supporter, the fluorescent material, the functional monomer , and the cross-linker, respectively. Afterward, a two-step imprinting polymerization reaction was implemented to fabricate the novel sensor MIPs/QDs@SiO 2 . Attributing to the SiO 2 with the surface functional monomer and the QDs with functional group, SAs molecules are attracted to the QDs and bound to the SiO 2 surface, hence accelerating the growth of homogeneous recognition sites on the surface of SiO 2 and guaranteeing the distance between the recognition sites and the QDs. After the experimental conditions were optimized, such fluorescence sensors can be used for well selective detection of SAs with a linear range of 2.0–30 μmol/L and a limit of detection is 0.17 μmol/L. Most importantly, the MIPs/QDs@SiO 2 can be successfully applied to the determination of SAs in real river water, which demonstrate high selectivity and stability and offer a promising platform for detecting environmental pollutants.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 54
·28683-28690
·
IF 3.708
Jie Feng,Zhifei Wang,Bin Shen,Liming Zhang,Xia Yang,Nongyue He
Mesoporous silica-coated Au nanorods (Aurod@SiO2) have recently attracted considerable interest in nanomedicine, and the template removal procedure is crucial for the preparation of such hybrid nanostructure. Herein, two kinds of typical extraction solvents, i.e., NH4NO3–CH3OH and HCl–CH3OH, were separately used to extract the surfactant cetyltrimethylammonium bromide (CTAB) from the obtained Aurod@SiO2. The results show that CTAB molecules could be completely removed from the pores of Aurod@SiO2 without damaging the internal Au nanorod by NH4NO3–CH3OH, while Aurod@SiO2 treated with HCl–CH3OH suffered from both poor extraction efficiency and the shape transformation of Au nanorod due to selective etching in the presence of oxygen. In addition, the consequent drug loading experiment shows that Aurod@SiO2 extracted by NH4NO3–CH3OH possesses a larger drug loading capacity with a loading efficiency of 82.5%. Furthermore, the in vitro photo-thermal therapy experiment shows that Aurod@SiO2 extracted by NH4NO3–CH3OH is more efficient in killing the YCC-2 gastric cancer cells as compared with that extracted by HCl–CH3OH.
研究领域:
纳米医学
·
材料科学
·
生物医学工程
·
癌症研究
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Nano
·
2025
·
IF 8.2
Yinchun Fang,Xianglu Zhao,Xuchen Tao
Photonic crystals (PCs) structural color coatings have been widely studied due to their advantages of environmental friendliness, resistance to fading and high color saturation. However, they still have problems such as single function and being easily affected by the external environment. In this research, fluorescent SiO 2 @polypyrrole@carbon quantum dots (SiO 2 @PPy@CQDs) microspheres were synthesized by incorporating CQDs into SiO 2 @PPy microspheres, which were self-assembled on the white cotton fabrics to form an amorphous photonic structure (APS). These APS exhibited angle-independent structural colors under natural light and blue fluorescence under UV light. The structural colored cotton fabrics obtained superhydrophobicity with a water contact angle (WCA) greater than 150° and self-cleaning function after treatment with polydimethylsiloxane (PDMS). The anti-counterfeiting structural colored fabrics with single response to UV light and dual responses to water/UV light based on SiO 2 @PPy@CQDs, SiO 2 @PPy and SiO 2 microspheres were prepared by using multi-layer alternating atomization deposition and PDMS hydrophobic treatment processes. This study provides a novel approach for developing multifunctional structural color coatings with self-cleaning and anti-counterfeiting based on fluorescent organic/inorganic hybrid microspheres.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·Vol. 108
·期 12
·e70185
·
IF 3.8
Luyang Zhang,Lin Chen,Jiankun Wang,Bingyan Wu,Jing Feng
Directional optimization of properties is of significant interest for various protective coatings materials. This study investigates the effects of SiO 2 doping on AlTaO 4 ceramics as environmental barrier coatings (EBCs), and the changes in crystal structure and comprehensive properties are thoroughly investigated. The x mol% SiO 2 –AlTaO 4 (SATO, x = 0, 3, 6, 9, 12, 15) ceramics are fabricated via a solid-state sintering process, and their structures, as well as thermo-mechanical properties, are systematically analyzed. The results reveal that SiO 2 doping introduces point defects and lattice distortions, which significantly reduce the thermal conductivity by 44% at 900°C, and effectively suppresses the increase in thermal conductivity at elevated temperatures. Furthermore, the fracture toughness is improved from 3.01 to 3.38 MPa·m 1/2 , demonstrating superior mechanical properties compared with other EBC materials. The thermal expansion coefficients (TECs) are reduced to 5.71 × 10 −6 K −1 at 1200°C, which match with those of SiC ceramic matrix composites (TECs = 5.50 × 10 −6 K −1 ). These findings highlight that SATO ceramics are promising candidates as EBC materials, and SiO 2 doping can further advance its high-temperature applications.
研究领域:
材料科学
·
陶瓷
·
热障涂层
·
高温材料
·
材料力学性能
✓ 已验证
产品关联
DOI
高影响因子
TEXTILE RESEARCH JOURNAL
·
2015
·
IF 1.599
Guangqing Zhuang,Wei Ping,Yun Zhang,Yanrong Jia,Lan Zhou,Qinguo Fan,Jianzhong Shao
Structural coloration is a kind of biomimetic coloring technology. (Silica/polyethyleneimine)n (SiO2/PEI)n films with structural color on the surface of silk fabrics were fabricated by the electrostatic self-assembly method. The structural color of silk fabrics with (SiO2/PEI)n films was captured by a digital camera, and the reflectance spectra were measured by the DigiEye system and a multi-angle spectrophotometer. The morphological structure of (SiO2/PEI)n films on silk fabrics was observed by a field emission scanning electron microscope. The coloring mechanism of the silk fabrics is in agreement with single thin film interference theory, and the variability of the structural color on the silk fabrics is similar to those on polyester fabrics varying with the assembly cycles, particle sizes and viewing angles. However, the color brilliance, brightness and iridescence effect of the silk fabrics are inferior to those of polyester fabrics with the same films, due mainly to the differences in fiber surface structure and microstructure between silk fibers and polyester fibers.
研究领域:
材料科学
·
纺织工程
·
光学
✓ 已验证
DOI
高影响因子
SENSORS
·
2025
·Vol. 25
·期 7
·2316
·
IF 3.5
Jianjun Ding,Niansong Liu,Ganglin Wang,Naiyu Guo,Chao Sun
In response to the shortcomings of traditional surface-enhanced Raman spectroscopy (SERS) substrates, such as short shelf life, poor uniformity, and low selectivity, this study innovatively proposed a three-dimensional composite substrate of CNTs/Ag/AgNWs/SiO 2 . This substrate demonstrates excellent SERS enhancement effects, with a detection limit of 10 −12 mol/L for the probe molecule Rhodamine 6G (R6G) and an enhancement factor (EF) of 8.947 × 10 8 . Further experiments confirmed the substrate’s superior uniformity and stability. The enhancement mechanism was investigated using both experimental methods and the Finite Difference Time Domain (FDTD) approach. When commonly used pesticide thiram was used as the target analyte, the detection limit of the substrate reached 0.1 mg/L, which is significantly lower than the pesticide residue standards of China and the European Union. Additionally, the genetic algorithm (GA)-optimized Back Propagation (BP) neural network was introduced for the quantitative analysis of thiram concentrations. The experimental results indicated that the GA-BP algorithm achieved the training prediction accuracy of 92.5% for thiram, demonstrating good network performance. This method shows good selectivity and has broad application prospects in the detection of toxic chemicals, environmental pollutants, and food additives.
研究领域:
分析化学
·
纳米材料
·
环境监测
·
食品安全
·
传感器与生物传感器
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
·
2025
·
IF 5
Ao Liu,Xue Feng,Zhaofeng Chen,Shijie Chen,Lixia Yang,Yucheng Guo,Pengze Yang,Zhiyuan Ma,Yiran Lin,Wei Zheng
To improve the thermal insulation and mechanical properties of aerogels at high temperatures, TiO 2 hollow-sphere-doped SiO 2 fiber-reinforced SiO 2 aerogel composites (TSA) were fabricated via a crushed ice templating method. The TiO 2 hollow spheres suppressed radiative heat transfer, and the ice templating produced a uniform isotropic structure. Using the Box–Behnken response surface methodology and a multi-objective grey wolf optimization algorithm combined with TOPSIS, the optimal formulation was determined as 4.5 wt% silica sol, 9.9 wt% SiO 2 fibers, 11.8 wt% TiO 2 hollow spheres, and 73.8 wt% SiO 2 aerogel powder. The optimized sample showed a surface temperature of 42.8 °C and a compressive strength of 29.7 kPa under a 500 °C heat source. This work demonstrates an effective strategy for designing high-performance thermal insulation aerogels.
研究领域:
材料科学
·
纳米科技
·
热力学
·
复合材料工程
·
先进功能材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2025
·Vol. 33
·期 1
·10
·
IF 2.8
Sun Ying-Xiang,Lu Kun-Rong,Ji Ying,Guo An-Bang,Zhang Jin,Zhang Yu-Hang
Solid polymer electrolytes (SPEs) are flexible and exhibit wide application prospects. However, their low ionic conductivity at room temperature largely restricts their practical use in next-generation solid-state lithium batteries. A composite polymer electrolyte (CPE) that combines the advantages of soft chains and rigid particles is constructed to balance the electrochemical properties and mechanical strength. Hydrophobic nano-fumed silica (SiO 2 ) fillers are uniformly distributed in the dense cross-linking -CH 2 -CH 2 O- network, which is composed of polyethylene oxide and tetraglyme that is triggered by ultraviolet irradiation. The increasing amorphous region of the resulting CPE, due to the cross-linking and nanoparticles doping, facilitates an excellent electrochemical property with an ionic conductivity of 0.29 mS·cm − 1 and a lithium transference number of 0.60 at room temperature. Moreover, the compact film with a tensile elongation of 57% can provide close interfacial contact and ensure more security for cells at work. The assembled Li||LiFePO 4 cells can deliver a reversible specific capacity of 160 mAh g − 1 at 0.1 C at room temperature and a capacity retention of 98% after 100 cycles. This study proposes a novel method for creating high-performance composite solid electrolytes at room temperature.
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2025
·
IF 6.1
Huaiyin Chen,Mingzu Xu,Jinbo Wang,Congxiang Li,Xiaolin Liu,Meihua Wu,Wei Wang,Longmin Liu,Yongzhao Li,Weihe Yu,Yuekun Lai,Weilong Cai
In this work, amphiphilic Janus F-SiO 2 -NH 2 particles were prepared through step-by-step modification of SiO 2 particles inlaid in and released from paraffin microspheres by fluorosilane and aminosilane respectively, and further modified waterborne epoxy (WEP) coating. The morphology, structure, composition, and surface wettability of the prepared particles as well as the mechanical properties and corrosion resistance were investigated. The results indicate that the modified coating gained the improved mechanical properties and anti-corrosion performance. Electrochemical impedance spectroscopy tests show that after immersion in 3.5 wt% NaCl solution for 15 days, the impedance modulus at low frequency of F-SiO 2 -NH 2 modified WEP coating was above 10 6 Ω∙cm 2 , two orders of magnitude higher than that of WEP coating. The amphiphilic Janus F-SiO 2 -NH 2 particles not only improved the interfacial compatibility and penetration resistance through the good dispersibility, hydrophobic groups and cross-linking with epoxy resin matrix, but also oriented adsorbed on steel surface to form protective hydrophobic layers. This work provides a simple design approach for constructing highly corrosion-resistant waterborne coatings, which has a certain promoting effect on the development of environmentally friendly high-performance anti-corrosion coatings.
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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）