JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 3
·e53341
·
IF 3.057
Zhehong Lu,Yubing Hu,Tengyue Zhang,Hao Li,Haoran Bai,Guangpu Zhang,Fan Guo,Wei Jiang
The anti-migration ethylene propylene diene terpolymer (EPDM) inhibitor coating was prepared by using EPDM as a composite matrix and silicon-functionalized graphene oxide (GO-SiO 2 ) as modifiers to prevent the migration of energetic plasticizers in propellants. The anti-migration performance at different temperatures was analyzed by investigating the diffusion of dioctyl sebacate (DOS) using thermal analysis and immersion tests. After adding 1.0 wt% GO-SiO 2 , the overall performance of the inhibitor coating was the best, and the concentration of DOS that migrated into the inhibitor coating at 30°C was reduced from 45.1% to 38.8% (13.9% decrease). The results confirmed that the introduction of GO-SiO 2 prevented the migration of dioctyl sebacate to the EPDM inhibitor coating. The scanning electron microscopy results showed that GO-SiO 2 was well-dispersed in the inhibitor coating, and the tensile strength increased from 1.80 to 2.11 MPa. Migration kinetics analysis showed that the anti-migration performance was closely related to the crosslink density.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Maosai Zhang,Ye Yang,Wenchuan Guo
In this work, a simple electrochemical sensing platform based on acid-treated Fe 3 O 4 @SiO 2 nanoparticles was successfully prepared for nitrite and sulfite detection. Fe 3 O 4 @SiO 2 nanoparticles were synthesized through the sol–gel and hydrothermal methods. Fe 3 O 4 @SiO 2 presented positive charges after acid treatment, which could enhance the electrostatic attraction between Fe 3 O 4 @SiO 2 and nitrite and sulfite. The Fe 3 O 4 @SiO 2 (acid-treated) modified magnetic glassy carbon electrode (MGCE) was applied to detect nitrite and sulfite using differential pulse voltammetry and cyclic voltammetry. Under optimized conditions, the developed electrochemical sensor presented good analytical properties for nitrite and sulfite detection with detection limits of 3.33 μmol/L and 31.57 μmol/L, respectively. The good recoveries varied from 85.18% to 111.02%, with a relative standard deviation of 0.23–4.80%. Furthermore, the Fe 3 O 4 @SiO 2 (acid-treated) modified MGCE showed better selectivity, reproducibility, and repeatability in nitrite and sulfite detection. Therefore, this proposed electrochemical sensor provides a new method for developing a nitrite and sulfite detection sensor.
研究领域:
食品科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2022
·Vol. 15
·期 1
·186
·
IF 4.967
Qun Yang,Run Zhang,Mingfei Liu,Ping Xue,Lichao Liu
Ultra-high molecular weight polyethylene (UHMWPE)/high-density polyethylene (HDPE) blend with lower viscosity is more suitable for melt spinning compared to pure UHMWPE; however, the mechanical property of the blend fiber is hard to dramatically improve (the maximum tensile strength of 998.27 MPa). Herein, different content modified-nano-SiO2is incorporated to UHMWPE/HDPE blend fiber. After adding 0.5 wt% nano-SiO2, the tensile strength and initial modulus of UHMWPE/HDPE/nano-SiO2fiber are increased to 1211 MPa and 12.81 GPa, respectively, 21.57% and 43.32% higher than that of UHMWPE/HDPE fiber. Meanwhile, the influence of the nano-SiO2content on the performance for as-spun filament and fiber are emphatically analyzed. The crystallinity and molecular chain orientation of as-spun filament reduces with the addition of nano-SiO2. On the contrary, for fiber, the addition of nano-SiO2promoted the crystallinity, molecular chain orientation and grain refinement more obvious at a lower content. Furthermore, the possible action mechanism of nano-SiO2in the as-spun filament extrusion and fiber hot drawing stage is explained.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Feifan Chen,Bo Zhang,Weihao Cai,Nengquan Fan,Yongkang Lu,Luxia Yin,ZeKai Zhang,Wensheng Ning
Ag/SiO2–Al2O3 aerogel composites with different molar ratio of Si to Al were prepared by the sol–gel synthesis followed by drying under atmospheric pressure and then characterized by XRD, FT-IR, BET, SEM, XRF, TG-DTG, and Py-FTIR, respectively. The effect of doping Al on their physicochemical properties and adsorption desulfurization performance was investigated in comparison with Ag/SiO2. The incorporation of Al in Ag/SiO2 resulted in a gradual decrease in the specific surface area, an increase in the actual content of Ag, and an appearance of Brönsted acid centers. The actual content of Ag in Ag/SiO2–Al2O3-n increased first and then decreased with the increase in Al content. Doping Al in Ag/SiO2 led to an improvement in the adsorption capacity and the adsorptive selectivity for thiophene at the presence of toluene and cyclohexene, as well as the solvent washing regeneration performance, attributed to the adsorption of thiophenics on Ag/SiO2–Al2O3-n by π-complexation of Ag(I) and the acid–base interaction of Lewis and Brönsted centers with thiophenics simultaneously, and the increase in the actual content of Ag in the adsorbents. Ag/SiO2–Al2O3-100 had the largest adsorption capacity for thiophene and benzothiophene, 12.2 mg of S/gads (0.57 mmol of S/mmol of (Ag + Al)) and 17.7 mg of S/gads (0.53 mmol of S/mmol of (Ag + Al)), respectively.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2025
·
IF 8.9
Tao Yu,Jianjun Xu,Jianjun Chen,Jianxin Liu,Yanzi Gao
The application of polymer dispersed liquid crystal (PDLC) film has been significantly hindered due to its unsatisfactory contrast ratio ( CR ) in high-temperature environments, delayed response speed in low-temperature conditions, and suboptimal off-axis viewing angles. To address these issues, nano-particle SiO 2 with a similar refractive index to polymer was introduced into the film, and then the electro-optical properties and viewing angle characteristics of PDLC films with different contents of SiO 2 at 100 °C and −30 °C were analyzed. When the doping amount of SiO 2 is 1.5 wt% of the polymer component, the contrast ratio of PDLC films at 100 °C is increased to 16, which is 60 % higher than that of undoped SiO 2 films. At −30 °C, the saturation voltage is 59 V (2.95 V/μm), and the rise time and decay time are 0.35 s and 2.5 s, respectively, slightly higher than the film without doping SiO 2 . The film also maintained a good viewing angle, with H on < 15 % at 45° and T on > 60 % at 60°. Balancing the film’s viewing angle and working temperature is anticipated to enhance its applicability for outdoor smart windows.
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
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 27
·期 12
·13161-13170
·
IF 1.798
Qin Tianxiu,Zhang Shuxia,Chen Pei,Zhao Fengqi,Gao Hongxu,Chen Xinbing,An Zhongwei
TiO 2 nanocrystals are inserted in the pores of monodispersed mesoporous SiO 2 nanospheres with 20–35 nm diameter by a facile two-step method involving vacuum-rotary evaporation and subsequent calcination. Characterization by XRD, TEM, EDX, FT-IR and N 2 sorption techniques suggests that, the pores of the mesoporous SiO 2 nanosphere can effectively stabilize the anatase phase of TiO 2 nanocrystals with size about 6 nm even at high temperature of 750 °C. The photocatalytic activities of the samples with different TiO 2 loading amount were evaluated by the degradation of Rhodamine B dye in aqueous solution under UV-light irradiation. It is found that photocatalytic efficiencies of these materials are much better than commercial P25. Where the sample with TiO 2 loading of 43 % exhibits the highest photocatalytic efficiencies with complete degradation of Rhodamine B within 32 min, which is attributed to the balance between high surface area and suitable TiO 2 loading amount.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 19
·9693-9700
·
IF 3.708
Jian Zou,Yun-Gui Peng,Yi-You Tang
Monodisperse Fe3O4@SiO2 nanoparticles are prepared using hydrazine as a catalyst via a biphase approach without any alcohols or surfactants. Fe3O4 seeds can be dispersed well in this system. The sizes of Fe3O4@SiO2 nanoparticles with a single core could be regulated from 20 nm to 50 nm corresponding to SiO2 shell thickness from 3 nm to 17 nm. Core-free SiO2 nanoparticles are not observed in this system. The coating process can be implemented at a temperature greater than 90 °C, which results in a short coating duration from 2 h to 8 h for different shell thicknesses. Hydrazine can prevent the Fe3O4 core from oxidization during coating at this temperature. Fe3O4@SiO2 nanoparticles have high chemical stability and magnetic saturation. A plausible formation mechanism of these nanoparticles is also presented.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Xuerui Zhang,Shuo Wang,Yixin Ren,Xiaoting Fu,Xiaodong Bi,Xia Wang,Ru-Song Zhao
Fluorine-functionalized covalent organic frameworks (F-COFs), owing to their multiple interactions such as F-F forces and hydrophobicity, have been widely used as candidate materials for stationary phases and other analytical purposes. How to incorporate F-COFs with a silica matrix (SiO 2 ) through a low-energy consumption method, and investigating the chromatographic properties for pharmaceutical targets, is of vital importance and requires significant further research. In this study, pentafluorophenyl (PFP) was used as a functional group to prepare PFP-COF@SiO 2 at room temperature through two distinct synthetic approaches. The resulting PFP-COF@SiO 2 materials, designated as I and II, were systematically characterized, and their chromatographic performances, influential factors, and retention mechanisms were investigated. These two COF materials demonstrated similar material properties and effective separation towards phenolic acids, alkaloids and antiviral drugs. The results indicated that the designed two synthetic routes were to some extent tolerable and compatible with the order of reagent addition. This work offers a novel method for preparing PFP-COF@SiO 2 stationary phases oriented for pharmaceutical chromatographic applications.
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
ENERGY & FUELS
·
2018
·
IF 3.024
Hai-bo Zhao,Wen-ting Xu,Qiang Song,Jian-kun Zhuo,Qiang Yao
The migration of K during biomass thermal conversion can cause severe ash-related problems. K2CO3 and KCl are two important inorganic forms of K that appear during biomass thermal conversion. In this study, a fixed-bed reactor was used to investigate the effect of H2O vapor and SiO2 on the migration characteristics of these two inorganic K species. The results showed that K is released through the decomposition of pure K2CO3 during pyrolysis. K release from K2CO3 at 800 °C was not obvious, and the release rate increased significantly with temperature but mainly depended on the decomposition rate of K2CO3. The presence of H2O vapor can promote K release by reacting with K2CO3 and forming volatile KOH. When SiO2 was present, a rapid reaction occurred between SiO2 and K2CO3, and this reaction inhibited the release of K significantly. The reaction rate increased significantly with temperature, and H2O vapor promoted the reaction of SiO2 and K2CO3. In a pyrolysis atmosphere, KCl can be released by direct evaporation and cannot react with SiO2; by contrast, KCl can react with SiO2 to form insoluble K silicates in the presence of steam. With increasing temperature, the release rate of KCl increased faster than the K-silicate formation rate, resulting in a decrease in the proportion of insoluble K silicates generated. The results obtained in this work provide a basis for understanding the migration of inorganic K during biomass thermal conversion.
研究领域:
能源化学
·
燃烧学
·
热力学
·
无机化学
·
环境工程
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2021
·
IF 6.617
Fan Hu,Feng Qi,Zehui Xiang,Biao Zhang,Fugang Qi,Nie Zhao,Xiaoping Ouyang
A nano-polymer (IL@SiO 2 ) was synthesized by double bond polymerization and creatively applied to polyurethane elastomer (PUE-IL@SiO 2 ). The mechanical properties and energy absorption of PUE-IL@SiO 2 at static compression and dynamic impact were studied, respectively. The results show that: compared with pure PUE, the static compressive properties and dynamic impact resistance of PUE with a loading of IL@SiO 2 of 2wt% are the best, and the static and dynamic compressive yield strength are improved by 216.15% and 190.68% compared with PUE respectively. Moreover, the energy absorption of PUE-2%IL@SiO 2 is improved by 18.87% compared with PUE. The composite materials (PUE-2%IL@SiO 2 ) also has excellent deformation recovery performance. These outstanding mechanical properties illustrate the IL@SiO 2 is excellent impact resistance and reinforcing materials for PUE.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Ping Hu,Yan Chen,Xi Yan,Wan-Zhong Lang,Ya-Jun Guo
VOX-SiO2 catalysts have been synthesized by the one-pot method using different vanadium precursors, namely, ammonium metavanadate (NH4VO3; VO3–, V5+), vanadium acetylacetonate [V(acac)3; organic complex, V3+], and vanadyl sulfate (VOSO4; VO2+, V4+). The influence of different vanadium precursors on the structure–performance relationship of these catalysts is studied on the propane dehydrogenation (PDH) reaction. The catalysts derived from VO3– attain a mesoporous structure with fairly high specific surface area and large pore volume, while those prepared with V(acac)3 or VOSO4 display a microporous structure. It is noted that VOX-SiO2 catalysts derived from NH4VO3 present a better catalytic performance, and low-polymerized VOX species display better intrinsic activity compared with isolated species. This study may contribute to the selection of vanadium precursors for the one-pot synthesis.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Shutong Hao,Xiaolin Liu,Qianli Li,Mu Gu,Shuai Cheng,Jingtai Zhao
The demand for scintillators with ultrafast decay times, high spatial resolutions, and high stabilities is increasing due to the development of ultrafast hard X-ray detection, hard X-ray imaging, and high-energy physics facilities. γ-CuI single crystals, which exhibit ultrafast luminescence and high stopping power for hard X-rays, hold great promise for such applications. However, slow luminescence and poor stability caused by surface iodine deficiencies hinder the practical use of γ-CuI. Herein, we treated a γ-CuI single crystal by iodine annealing and SiO2 coating and investigated its crystal structure and luminescence properties in detail. Iodine annealing significantly enhanced the near-band-edge emission of the γ-CuI crystal with an ultrafast decay time of less than 1 ns, while completely suppressing the slow luminescence. Moreover, the SiO2 film effectively prevented the oxidation and decomposition of surface iodine, leading to substantial improvement in luminescence stability. The γ-CuI crystal demonstrated an ultrahigh spatial resolution of 1.5 μm in X-ray imaging, highlighting its potential for ultrafast hard X-ray imaging applications. This study provides insight into the growth, optimization, and application of γ-CuI crystals, advancing the field of scintillator materials.
研究领域:
材料科学
·
光学工程
·
核技术应用
✓ 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）