JOURNAL OF CATALYSIS
·
2017
·
IF 6.844
Ping Hu,Wan-Zhong Lang,Xi Yan,Lian-Feng Chu,Ya-Jun Guo
VO X -doped porous SiO 2 solids (VO X -SiO 2 ) were synthesized at different gelation and calcination temperatures through an in-situ one-step synthesis and evaluated by non-oxidative propane dehydrogenation (PDH), exhibiting excellent catalytic performance. VO X -SiO 2 catalysts were characterized by XRD, low-temperature N 2 adsorption/desorption, SEM, TEM, UV–Vis, Raman, XPS, NH 3 -TPD, H 2 -TPR, and TGA. The structural and performance results for the catalysts reveal that gelation temperature has only a slight effect on the surface acidity, textural properties and VO X species dispersion of VO X -SiO 2 catalysts within a reasonable temperature range (30–60 °C). The 60-VO X -SiO 2 -580 catalyst, with a gelation temperature of 60 °C, a calcination temperature of 580 °C, and prepared by the one-step synthesis method, obviously shortens gelation process time by half compared to catalyst gelled at 30 °C and exhibits superior catalytic performance for PDH . Over high gelation temperature (≥75 °C) leads to the loss of integrity and decreases catalytic activity of the VO X -SiO 2 catalysts. Compared with the VO X -MCM-41 catalyst prepared by a one-step hydrothermal method, VO X -SiO 2 catalysts exhibit better catalytic activity and stability. Importantly, at a reaction temperature of 580 °C, the 60-VO X -SiO 2 -580 catalyst exhibits remarkable long-term catalytic stability in the eight reaction-regeneration cycles for PDH. Its propane conversion shows a slow decrease from 55% to 45% for a 4 h reaction duration, but the propene selectivity remains at approximately 91%. The results of this work will be beneficial for further industrial development and application of porous VO X -SiO 2 solids in catalysis.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2023
·Vol. 34
·期 6
·1918-1932
·
IF 3.4
Yuqian Du,Xueya Wang,Ziwen Zhou,Feng Zhao,Song Li,Zhihua Liu,Zhengyu Wu,Shuai Zhao,Lin Li
Nowadays, although highly conductive polymer composites filled with two-dimensional graphene-based nano-fillers have been explored extensively, constructing nanocomposites with high performance, industrial feasibility, and more efficient conductive networks at lower nano-filler contents remains a challenge. To achieve the above objectives, industrial wastes microsilica powder (N98) with amorphous spherical structure and large particle size is employed in this work. And the hybrids (TGN) are obtained between N98 and graphene (GE) by the effective bridging and interface coupling of tannic acid, which can achieve the purpose of obtaining conductive composites with low-filler contents by traditional polymer processing technologies. The volume exclusion effect of N98 and its own assisted dispersion effect can prevent and attenuate graphene agglomeration, enabling the formation of a dense, complete and uniform conductive network in natural rubber (NR) matrix based on a small amount of graphene addition (parts per thousand). Thus, it give the nanocomposite highly functional, especially electric property. The results show that when the ratio of GE to N98 hybridization is 1:20, N98 and graphene are more uniformly hybridized together, and the volume exclusion effect is best matched with the rubber composites, and the comprehensive performance is optimal. Moreover, the electrical conductivity of NR/TG 1 N 20 nanocomposite can reach the balanced value of 10 −3 S·cm −1 with the GE loading of 0.48 phr, which shows the effectiveness of the prepared hybrids.
研究领域:
高分子科学
·
纳米复合材料
·
功能高分子
·
材料化学
·
导电聚合物
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高影响因子
Sustainable Energy & Fuels
·
2021
·Vol. 5
·期 5
·1538-1547
·
IF 6.367
Ruyan Lei,Yanping Yang,Chenjuan Yu,Yinsi Xu,Yuanzhuo Li,Jun Li
In order to improve the electrochemical performance and efficiently prepare a solid polymer electrolyte (SPE) for the lithium-metal battery (LMB), a fumed SiO2 (FS) with surface Si–OH group was used to fabricate FS-modified poly(ethylene oxide) (PEO)–LiClO4-based SPE by a facile preparation process. The influences of the FS content on the morphological properties, thermal properties, lithium salt dissociation, mechanical properties, and electrochemical properties of SPE were systematically analyzed. Results indicate that FS with the hydrophilic property was widely distributed throughout the amorphous phase of SPE, thus the crystallinity of SPE was reduced to 25.83% when the FS mass loading was 6.85 wt%. In addition, a greater dissociation degree of lithium salt was achieved after the addition of FS, and a higher ion conductivity of 3.03 × 10−4 S cm−1 and Li-ion migration number of 0.396 were recorded at 60 °C. The all-solid-state Li/SPE/Li coin cell showed excellent stable cyclability (380 h) and the LiFePO4 (LFP)/SPE/Li coin cell demonstrated good discharge specific capacity and coulomb efficiency of 96 mA h g−1 and 100.2%, respectively, after 100 cycles of galvanostatic charge–discharge operation under 0.5C at 60 °C. Thus, based on collective results, it is expected that SPE presented in this work is a promising electrolyte for next-generation high-energy all-solid-state LMB with enhanced safety.
研究领域:
材料科学
·
电化学
·
能源存储
·
高分子化学
·
固态离子学
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DOI
高影响因子
ChemistrySelect
·
2023
·Vol. 8
·期 31
·e202300799
·
IF 2.1
Lin-Jie He,Yao-Feng Wang,Peng-Xin Guan,Qing-Shan Niu,Hong-Ying Liu,Bao-Hua Xu
The vapor-phase nitrilation of dimethyl adipate (DMA) with ammonia (NH 3 ) is an environmentally benign route leading to adiponitrile (ADN) with great application value. In this study, the performance of HZSM-5 zeolites, widely used in industry as the solid acid catalysts, was investigated. It exhibits a strong correlation between the SiO 2 /Al 2 O 3 ratio (SAR) in HZSM-5 zeolites and the reactivity (both activity and selectivity). The influence of Al density closely related to the value of SAR on the reactivity of HZSM-5 was thus elucidated by mechanistic experiments. As a result, the introduction of Al element to the framework is beneficial to the activation of ester functionality, thus improving the activity, especially at a high liquid hourly space velocity (LHSV). However, a high Al density will lead to poor selectivity and deactivation due to too strong adsorption of esters and intermediates (e. g., amides). Herein, the balanced adsorption/desorption capability was reached on HZSM-5 with SAR as 631 (i. e., HZSM-5-631), which provides the best selectivity to nitriles (S ADN+MCP , 92.5 %) at a high single-pass conversion of DMA (C DMA , 98.0 %). Graphical The nitrilation of DMA over HZSM-5 with different SiO 2 /Al 2 O 3 was investigated, wherein HZSM-5 with SiO 2 /Al 2 O 3 of 631 exhibited excellent reactivity due to the balance of ester activation and amide intermediate desorption.
研究领域:
催化化学
·
化学工程
·
绿色化学
·
材料科学
·
有机合成
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DOI
高影响因子
Journal of Surface Investigation
·
2019
·Vol. 13
·期 6
·1192-1198
·
IF 0
Neshchimenko V. V.,Mikhailov M. M.
The reflectance spectra of ZnO, TiO 2 , and SiO 2 micro-, nano-, and hollow powders after their exposure to 100-keV protons are analyzed at wavelengths between 250 to 2500 nm. The hollow particles are up to 5 μm in size with a specific surface area of 32 to 57 m 2 /g. It is established that hollow particles have a greater radiation stability to proton exposure than microcrystal particles. The effect is due to the absence of radiation-induced defects in the volume of the spherical particles, low ionization losses, and a high ability to relax radiation-induced defects in the thin layer of the sphere.
研究领域:
材料科学
·
光学
·
辐射物理
·
纳米技术
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DOI
COLLOID AND POLYMER SCIENCE
·
2014
·Vol. 293
·期 2
·463-471
·
IF 2.41
Qi Dongming,Liu Chenghai,Chen Zhijie,Dong Guifang,Cao Zhihai
Poly(methyl methacrylate- co -butyl acrylate) (poly(MMA- co -BA))/SiO 2 nanocomposite particles with various morphologies were prepared through in situ emulsion copolymerization of methyl methacrylate and butyl acrylate using surface 3-(methacryloyloxy) propyl trimethoxysilane (MPS)-modified SiO 2 nanoparticles as nanofillers. The surface MPS-coupling density of SiO 2 nanoparticles could influence the hydrophilic–lipophilic properties of SiO 2 nanoparticles and subsequently influence the particle morphology of poly(MMA- co -BA)/SiO 2 nanocomposite particles. With the increase of the surface MPS-coupling density of SiO 2 nanoparticles, the morphology of nanocomposite particles changed from a raspberry-like one to a guava-like one. A formation mechanism of nanocomposite particles with various morphologies was proposed on the basis of the results of polymerization kinetics, particle size evolution in the process of polymerization, and particle size and morphology of the final nanocomposite particles.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Xin Wang,Yao Luo,Chen Zhang,Xin Li,Qi Li,Jianliang Xie
To meet the need for ultrathin high-temperature radar-stealth coatings with effective X-band absorption, a metasurface-regulated FeSiCr/CaO-B 2 O 3 -SiO 2 (FSC/CBS) composite coating was designed. FSC/CBS coatings with different FSC contents were fabricated by atmospheric plasma spraying to examine the effects of absorber loading on particle state, microstructure, electromagnetic parameters, and high-temperature absorption. Increasing FSC content raised the in-flight particle temperature and promoted FSC spreading and flattening, causing the absorbing phase to evolve from isolated particles to lamellar structures and locally connected conductive networks. These structural features enhanced interfacial polarization and conduction loss, whereas excessive FSC aggregation suppressed the effective magnetic response through demagnetization and skin-effect shielding, degrading impedance matching. The 1-mm-thick 40FSC/CBS coating showed stable Ku-band absorption at 600 °C, with reflection loss below −5 dB over 11.7-18.0 GHz. After metasurface loading, its effective absorption band was regulated to 8.0-13.78 GHz, covering the entire X band, and the cavity radar cross section was reduced by 12.17 dBsm.
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产品关联
DOI
高影响因子
DESALINATION
·
2026
·
IF 9.9
Xin Shi,Qiuyan Bi,Zizhen Peng,Zhicheng Wang,Yakai Lin,Wenzhong Ma,Chuanjie Fang,Chao Zhang,Shiai Xu
In situ SiO 2 growth with DA-g-C 3 N 4 co-doping yields hybrid crosslinked PA layer. • Compound strategy mitigates DA-g-C 3 N 4 aggregation in PA layer. • Achieved simultaneous gains in Mg 2+ /Li + selectivity and permeability performance. • MgCl 2 rejection stayed >93% over 160 h, demonstrating excellent long-term stability. It is often difficult for thin-film composite (TFC) nanofiltration (NF) membranes to balance high separation selectivity and high permeability, and the contradiction between the two will lead to their overall performance constraints. In this study, a dual-phase regulation strategy is proposed, which adopts the in-situ sol method and the composite strategy of introducing two-dimensional materials for the preparation of organic-inorganic cross-linked polyamide (PA) NF membranes. A trimesoyl chloride (TMC) organic phase solution containing tetraethyl orthosilicate was first introduced onto the polyethersulfone (PES) substrate, followed by contact with a polyethyleneimine (PEI) aqueous phase solution containing dopamine-functionalized carbon nitride (DA-g-C 3 N 4 ), during which silicon dioxide (SiO 2 )/Si–O–Si domains were generated in situ within the PA layer. These domains restricted the free volume of the PA layer, narrowed the effective pore-size distribution, and suppressed nonselective defects, while the embedded DA-g-C 3 N 4 improved the compatibility between the nanofillers and the PA layer, thereby producing P-1Si-0.025CN membranes with an effective pore size of 0.4 nm. Compared with the P-NF membrane prepared by reverse interfacial polymerization of TMC and PEI directly on the PES substrate, Mg 2+ /Li + separation factor (SF) increased to 67.2 (Mg 2+ /Li + mass ratio is 20), salt solution flux was 27.1 LMH, separation and permeation capacity of mixed salt was enhanced, salt solution flux has increased by 4 times, and the SF has increased by 7 times, Mg 2+ /Li + ratio decreased from 20 in feed to 0.71 in permeation process. Moreover, it exhibited excellent separation performance in diluted salt lake brine, with an Mg 2+ rejection rate exceeding 98%, and it also exhibited high fouling resistance and long-term stability. Download: Download high-res image (155KB) Download: Download full-size image
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产品关联
DOI
高影响因子
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
·
2026
·Vol. 48
·期 10
·422
·
IF 4.3
Wen Kunyu,Wang Mengjie,Wang Bin,Yin Yiwen,Ma Yanbin,Lu Taotao,Miao Renhui,Qi Zhichong
Silica-based nanomaterials have shown promise for remediating heavy metal-contaminated soils. However, their remediation stability may be compromised by natural and anthropogenic activities such as rainfall and irrigation. This work systematically investigates the leaching behavior of Cd from soils amended with unmodified SiO 2 and thiol-functionalized SiO 2 (SH-SiO 2 ) nanoparticles, along with nanoparticle-mediated Cd release and transport through soil porous media. The results demonstrated that the leaching concentrations of Cd 2+ from the soil remediated by SH-SiO 2 were the least and followed the order of SH-SiO 2 < SiO 2 ≈ control (untreated Cd-contaminated soil) under simulated acid rain conditions (pH 5.6). This confirms that thiol-functionalized silica effectively immobilizes Cd due to its strong chelating ability. However, co-transport experiments revealed that both SiO 2 and SH-SiO 2 nanoparticles could act as carriers that enhanced Cd 2+ transport, governed by their Cd-binding capacity and intrinsic mobility over a pH range of 5.0–8.0, with greater facilitation at higher pH levels. Notably, SH-SiO 2 exhibited a much stronger facilitation effect, attributable to its higher affinity for Cd 2+ , greater mobility in porous media, and resistance to desorption of SH-SiO 2 -bound Cd 2+ . At a nanoparticle concentration of 50 mg/L, the maximum breakthrough of Cd 2+ reached 10.1% for SiO 2 and 75.2% for SH-SiO 2 . While SH-SiO 2 demonstrates excellent Cd immobilization capacity and acid-rain resistance, any disturbance that remobilizes these nanoparticles may facilitate the mobility of Cd 2+ , potentially expanding the scope of heavy metal contamination. Therefore, when applying remediation agents for soil rehabilitation, it is crucial to consider their long-term effectiveness and stability.
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PubMed
高影响因子
Materials Today Nano
·
2026
·
IF 7.6
Xinhua Liu,Shuhua Tian,ZhongRui Zhao,Wei Li,Rui Zhang,Ningxuan Wen,Shaowei Lu
Flexible pressure sensors based on polymer substrates integrated with conductive nanomaterials have been extensively investigated. However, the inevitable thermal degradation of polymer substrates and the difficulty in achieving robust loading of conductive materials remain critical bottlenecks. In this study, we successfully developed a high-performance flexible SiO 2 /MXene composite pressure sensor via a coordination-driven synergistic assembly strategy, combining electrospinning with surface amino-functionalization. This strategy utilizes robust N-Ti coordination bonds formed between the grafted amino groups on the SiO 2 fiber surfaces and the titanium atoms of MXene (Ti 3 C 2 T x ) to drive the firm attachment of conductive nanosheets onto the inorganic skeleton. This design not only fundamentally overcomes the thermal vulnerability of conventional substrates but also eliminates the persistent challenges of MXene detachment and restacking, ultimately constructing a composite nanofiber network featuring a unique scale-like micro-rough surface. Benefiting from the robust three-dimensional (3D) elastic network and the micro-rough surface architecture of the fibers, the sensor exhibits a wide sensing range (0.025-180 kPa), high sensitivity (11.547 kPa −1 , 0-1 kPa), and excellent cyclic stability. Furthermore, the sensor can monitor subtle physiological signals and large-scale limb movements in real time while also maintaining pressure-sensing capabilities in environments up to 250 °C, fully demonstrating its immense potential for advanced wearable health monitoring systems under complex and extreme conditions.
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DOI
高影响因子
LANGMUIR
·
2026
·
IF 4.4
Jiang Jie,Yang Ling,Jiang Tian,Ma Zhenye
Ultrafine ammonium perchlorate (UF-AP) is prone to hygroscopic
agglomeration, which severely affects the loading uniformity and combustion
stability of solid propellants. In this study, hydrophobic modification
of nano-silica was conducted using 1H,1H,2H,2H-perfluorooctyltriethoxysilane
(PFOTES). SiO 2 –PFOTES particles with different modifier
loadings were prepared and then coated onto the surface of UF-AP via
a wet coating process to obtain UF-AP/SiO 2 –PFOTES
composite particles. The microstructure, thermal decomposition behavior,
surface wettability, storage stability, and mechanical sensitivity
of the composite particles were characterized by SEM, EDS, FTIR, XRD,
TG-DSC, contact angle measurement, and hygroscopicity tests. The results
show that PFOTES is successfully grafted onto the SiO 2 surface.
When the modifier loading is 4%, the SiO 2 –PFOTES
particles exhibit superhydrophobicity (water contact angle >150 ° ).
At a coating content of 5%, SiO 2 –PFOTES forms a
well-distributed coating layer on the UF-AP surface, as evidenced
by SEM, TG, and surface wettability analyses. Consequently, the water
contact angle of the composite particles increases from 0 ° to
79.7 ° , the moisture absorption rate decreases from 0.26% to 0.08%
(a reduction of 69.23%), and the surface energy decreases from 78.72
J/m 2 to 31.39 J/m 2 . Moreover, the composite
particles maintained good dispersibility after storage in a laboratory
environment for 30 days. Thermal decomposition tests revealed that
the low-temperature and high-temperature decomposition peaks of UF-AP
merged into a single exothermic peak after coating, with the total
heat release increasing from 319.3 J/g to 380.5 J/g (an apparent increase
of 18.65% based on composite mass, corresponding to a 25.4% increase
when normalized to per gram of AP). Mechanical sensitivity tests showed
that the coating did not introduce additional safety hazards under
the tested conditions. This study provides an effective strategy for
anti-hygroscopic modification of UF-AP, showing good application prospects
in the field of solid propellants.
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高影响因子
NANO
·
2026
·
IF 1.3
Weifeng Chen,Dandan Han,Zhiwei Huang,Xuan Tian,Ting Xiao,Yizhu Lei
Ice accretion severely compromises infrastructure safety and efficiency. While integrating photothermal function with superhydrophobicity offers a promising solution, achieving this synergy within a mechanically robust coating remains challenging. Herein, we present a superhydrophobic nanocomposite coating fabricated by embedding multi-walled carbon nanotubes (MWCNTs) and hydrophobic silica (H-SiO 2 ) in an organosilicon polymer (OSP) matrix. The OSP/MWCNT/H-SiO 2 coating exhibits good mechanical durability, maintaining superhydrophobicity after severe water and sand impact, owing to the reinforced composite structure. Crucially, the design yields a remarkable photothermal conversion efficiency, achieving a temperature rise of 85 °C under 1.0 kW·m −2 irradiation. This photothermalsuperhydrophobic synergy enables outstanding anti-icing performance, delaying ice formation for over 578 s at -20 °C, and efficient solar-driven de-icing (complete melting within 462 s). Successfully demonstrated on insulators, our coating offers a viable dualfunctional platform to address icing challenges in practical settings.
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高影响因子
危险品化学品经营许可证（带存储）