Materials
·
2021
·Vol. 14
·期 14
·4012
·
IF 3.623
Enpei Ma,Zhenghuang Wei,Cheng Lian,Yinping Zhou,Shichang Gan,Bin Xu
This article reports the design and manufacture of colored microcapsules with specific functions and their application in architectural interior wall coating. Utilizing reactive dyes grafted SiO2shell to encapsulate paraffin through interfacial polymerization and chemical grafting methods, this experiment successfully synthesized paraffin@SiO2colored microcapsules. The observations of surface morphology demonstrated that the colored microcapsules had a regular spherical morphology and a well-defined core-shell structure. The analysis of XRD and FT-IR confirmed the presence of amorphous SiO2shell and the grafting reactive dyes, and the paraffin possessed high crystallinity. Compared with pristine paraffin, the thermal conductivity of paraffin@SiO2colored microcapsules was significantly enhanced. The results of DSC revealed that the paraffin@SiO2colored microcapsules performed high encapsulation efficiency and desirable latent heat storage capability. Besides, the examinations of UV-vis and TGA showed that the paraffin@SiO2colored microcapsules exhibited good thermal reliability, thermal stability, and UV protection property. The analysis of infrared imaging indicated that the prepared latex paint exhibited remarkable temperature-regulated property. Compared with normal interior wall coatings, the temperature was reduced by about 2.5 °C. With such incomparable features, the paraffin@SiO2colored microcapsules not only appeared well in their solar thermal energy storage and temperature-regulated property, but also make the colored latex paint coating have superb colored fixing capabilities.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Jaehyeong Park,Sungjun Bae
In this study, a magnetically recyclable Pd catalyst was developed by using the novel support of iron-rich coal fly ash/silica (IRFA@SiO 2 ) for highly efficient reduction of p -nitrophenol ( p -NP). IRFA microspheres were coated with amorphous SiO 2 synthesized from non-magnetic coal fly ash (NMFA) and then loaded with Pd by impregnation method for the synthesis of Pd/IRFA@SiO 2 . Various surface analyses demonstrated that amorphous SiO 2 was well deposited on the surface of IRFA, providing a unique three-dimensionally structured SiO 2 layer to suppress aggregation of IRFA and enhance dispersion of Pd nanoparticles. Pd/IRFA@SiO 2 exhibited a significantly enhanced p -NP reduction than those of Pd/IRFA, Pd/Al 2 O 3 , and Pd/SiO 2 . Compared to other Pd- and metal-loaded catalysts, Pd/IRFA@SiO 2 showed ˜4000× enhancements in k obs-p-NP /C M (L min −1 g M −1 , M = precious metals) values and ˜3800× increases in price-normalized k obs-p-NP values, indicating that Pd/IRFA@SiO 2 is a highly efficient and cost-effective alternative catalyst. The catalyst was successfully recycled five times without significant leaching of Pd, Si, and heavy metals because of the magnetic property of Pd/IRFA@SiO 2 . The experimental results suggest the applicability of the surface-modified IRFA support for the development of novel magnetically recoverable catalysts without severe toxicity problems.
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高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2021
·
IF 8.528
Zixuan Lei,Jian Wang,Chi Zhang,Qianqiu Wu,Jian Li,Yuhong Liu
Simultaneously improving mechanical strength and toughness of thermosetting polymer nanocomposites remains a great challenge even though massive efforts have been made by controlling the aggregation and interface interaction of nanoparticles . In fact, crosslinking inhomogeneity and crosslinking density of thermosetting polymer nanocomposites can also profoundly affect the competing mechanical properties. Due to their conflicting influence on the toughness and strength of thermosetting polymer nanocomposites, the difficulty lies in how to coordinate the influence effectively. In this work, a mechanically tough and strong novolac phenolic nanocomposites (ESNH) were successfully constructed by introducing a reactive core-shell POSS with nanosilica as core and epoxy-polyhedral oligomeric silsesquioxane as shell (SiO 2 @EPOSS) (ES). Via controlling the quantity and the size of self-polymerized ES phase domain, the crosslinking inhomogeneity and crosslinking density of ESNH can be diversely tuned. Especially for 3%ESNH-3%, remarkably enhanced tensile properties and fracture toughness were realized. The self-polymerized ES phase domain with relatively small quantity and size was homogeneously grafted in phenolic networks, which could pin microstructural interfaces and junct nodular domains of phenolic networks, synergistically improving the crosslinking inhomogeneity and crosslinking density. Therefore, the moderately self-polymerized ES phase domain in the phenolic networks was remarkably contributed to coordinating the performance between the fracture toughness and tensile property. This study provides a novel and efficient envision toward simultaneously improving the toughness and strength of thermosetting polymer nanocomposites via tuning their curing behavior and the corresponding microstructure.
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高影响因子
RENEWABLE ENERGY
·
2019
·
IF 5.439
Bingmeng Li,Dan Shu,Ruifang Wang,Lanlan Zhai,Yuye Chai,Yunjun Lan,Hongwei Cao,Chao Zou
Inspired by the common preparation method of mesoporous silica where polyethylene glycol (PEG) was used as template to obtain porous silica , PEG/silica (PEG@SiO 2 ) composite as shape-stabilized phase change material for energy storage was well prepared. In this paper, PEG was used as phase change material (PCM) to store and release thermal energy and SiO 2 acted as the supporting matrix. Various techniques were employed to characterize the structural and thermal properties of PEG@SiO 2 . The results indicate that PEG was encapsulated in SiO 2 shell with physical interactions. The phase change enthalpy of PEG@SiO 2 is 164.9 J/g in the melting process and 160.1 J/g in the solidifying process with the mass fraction of 97 wt%. It is a considerably exciting result as the value is so close to pristine PEG’s (178.6 J/g). PEG@SiO 2 exhibited excellent thermal reliability based on the results of undergoing the heating-cooling cycle 100 times. Also, PEG@SiO 2 had a good thermal stability within its working temperature range. This study provides a general approach for increasing the loading of PCMs in porous materials and thus the energy storage capability.
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高影响因子
Nano Select
·
2024
·
IF 0
Zhiyu Zhang,Fei Long,Yanhong Guo,Yunxiao Liang,Jing Wang,Yong Ren
The large-sized nanofilm-constructed hierarchical porous SiO 2 (LNCHPS) is successfully prepared by the dual templating approach and subsequently used as the support for g-C 3 N 4 . A series of characterization techniques are conducted to evaluate the structure and property of the as-prepared materials. The LNCHPS possesses two sets of explicated successive pass-through macropores (0.5–1.0 µm) with large specific surface area. In addition, the macropore wall is constructed by uniform mesoporous nanofilms with the thickness ranging from 35 to 50 nm. Then, the photocatalytic property is investigated by degradations towards Rhodamine B (RhB) under simulated sunlight, in which experiments have been performed through controlling the g-C 3 N 4 loading contents, solution pH values, and photocatalyst dosages. The apparent rate constant of g-C 3 N 4 /LNCHPS could reach 0.03 min −1 under optimum conditions, showing 6.0 times that of the bulk g-C 3 N 4 . In addition, g-C 3 N 4 /LNCHPS also exhibits significantly enhanced performance in H 2 evolution (39.9 µmol h −1 ) compared to that of the bulk g-C 3 N 4 . High light absorption and utilization, enhanced adsorption capability and quick electron hole separation can render this fine structure excellent photocatalytic performance. Our work enables a facile route for large-scale preparation of g-C 3 N 4 /LNCHPS for addressing the wastewater treatment and hydrogen energy production simultaneously.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jun Li,Liying Pan,Qiu Zhang,Xueyue Lyu,Xinrui Wang,Jiawei Qi,Guangdong Zhao
SiOC ceramics are recognized for their exceptional chemical stability and favorable dielectric loss properties, making them viable candidates for microwave-absorbing applications. Nonetheless, the reliance on a singular loss mechanism limits their effectiveness in achieving efficient wave absorption. In this study, we introduce the SiFeBOC ceramic, which integrates Fe 3Si spheres and SiO 2 nanowires through a straightforward sol-gel method combined with a polymer-derived ceramic technique to incorporate magnetic particles into SiOC ceramics. The resulting material exhibits multiple loss mechanisms, including interfacial polarization, dipolar polarization, conduction loss, natural resonance, and eddy current loss, which collectively enhance its wave-absorbing capabilities. At a thickness of only 1.9 mm, the SiFeBOC ceramics achieve a minimum reflection loss (RL min ) of -47.96 dB and an effective absorption bandwidth (EAB) of 3.25 GHz. Additionally, a broader bandwidth of 4.39 GHz is achieved at a reduced thickness of 1.6 mm, with an RL value of -44.54 dB and an EAB of 4.05 GHz at 1.5 mm. The reflection loss per unit thickness (RL/t) reaches a minimum value of -29.69 dB/mm, while the effective absorption bandwidth per unit thickness (EAB/t) achieves a minimum of 2.74 GHz/mm. Furthermore, radar scattering cross-section (RCS) measurements reveal enhanced radar stealth capabilities compared to a perfect electrical conductor (PEC), with an RCS reduction of 7.72 dB·m 2 at 0° and an RCS min of -53.27 dB·m 2 at 146°. This study demonstrates that SiFeBOC ceramics possess significant potential for use in high-efficiency microwave absorption applications. Furthermore, it offers insights for the advancement of a new generation of microwave-absorbing materials characterized by low profile, broad bandwidth, and thin dimensions.
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高影响因子
FUEL
·
2024
·
IF 6.7
Xiao Yang,Zhuwei Yang,Linsen Li,Zhao Jiang,Guangxu Cheng
Dry methane reforming (DRM) represents a highly promising approach to greenhouse gas conversion (CO 2 and CH 4 ) to valuable byproducts. However, severe carbon deposition and catalyst deactivation inhibit large-scale applications. The work designed new catalysts with a yolk-shell structure using the water-in-oil microemulsion method. The catalysts were composed of a yolk-shell structure, with Ni-M as the active point and silica as the shell. The catalytic performance evaluation indicates that the Ni-M @SiO 2 catalysts show higher CH 4 and CO 2 conversion compared with the Ni@SiO 2 and conventional catalysts at 750 ℃, suggesting the yolk-shell structure and added M species enhance the DRM activity. The XRD, HRTEM, XPS, BET, H 2 -TPR, and CO 2 -TPD analysis confirmed the existence of yolk-shell configuration and evident electronic effect among Ni, M species, and SiO 2 . The long term measurements indicate that the added M species also bring higher carbon deposition tolerance for DRM, where Ni-Ce@SiO 2 and Ni-Zr@SiO 2 exhibit good structural and catalytic stability for DRM over 100 h. Through XRD, TEM, and TGA characterizations of the exhausted catalysts, it is determined that the coke deposition resistance of the catalyst is improved as a result of increased oxygen mobility and enhanced Ni dispersion on the catalytic surface, both of which are enhanced by the added Ce species. The structural analysis of the spent catalysts indicates that the tolerance of carbon deposition is improved by the yolk-shell samples. This study can offer valuable insights for the development of Ni-based catalysts with exceptional carbon deposition capability for DRM.
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高影响因子
ENERGY
·
2025
·
IF 9.4
Jing Fan,Liang Guo,Nan He,Fenhong Song
Utilizing solar energy for photocatalytic hydrogen production provides a promising pathway for sustainable energy conversion. However, the traditional photocatalyst has the defects of excessive charge recombination speed and poor stability. In this work, a series of Si-Sn 3 O 4 /g-C 3 N 4 heterojunction catalysts were synthesized via a facile ultrasonic-assisted thermal treatment method. The optimized Si-Sn 3 O 4 -5/CN composite exhibited a remarkable hydrogen evolution rate of 5295 μmol∙g −1 h −1 under visible light, which is 2.21 and 54 times higher than that of pure g-C 3 N 4 and Si-Sn 3 O 4 , respectively. Extensive characterization (XPS, PL, EIS, etc.) confirmed the formation of a Type-II heterojunction, which significantly promotes charge separation and transfer. Furthermore, the composite demonstrated excellent photocatalytic stability over four consecutive cycles. This work offers an efficient and stable photocatalyst system for solar-driven hydrogen production and sheds light on the design of heterostructured photocatalysts.
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高影响因子
Foods
·
2025
·Vol. 14
·期 23
·4151
·
IF 5.1
Ziliang Fan,Miaomiao Li,Xingyu Wang,Haixia Zhou,Faraz Ahmed,Yongheng Zhu
Listeria monocytogenes(LM) poses a serious threat to food safety and public health. Current detection methods suffer from drawbacks such as expensive equipment, complex procedures, and time-consuming processes, highlighting the urgent need for a simple, rapid, accurate, and cost-effective detection approach. The bacterial metabolite 3-hydroxy-2-butanone (3H2B), due to its high abundance, can serve as a reliable biomarker for detection. Herein, ordered mesoporous silica nanoparticles (MSNs) were synthesized via a one-pot method and subsequently functionalized with APTES. The NH2-MSNs-2 exhibits extremely high sensitivity (768 Hz@50 ppm) and selectivity towards 3H2B due to its high specific surface area, abundant mesoporous structure, and weak chemical adsorption between amino groups and the 3H2B. The quartz crystal microbalance (QCM) sensor developed based on this material demonstrated outstanding performance in testing the contamination levels ofLMin food. This study provides a solid foundation for further exploring the fundamental mechanisms of QCM sensors in the real-time, non-invasive detection ofLM, while also demonstrating significant application potential in the field of food safety assurance.
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Haonan Xue,Zihao Song,Yongguang Wang,Haiming Li,Hongyan Li,Centao Zheng,Dongqing Wei,Xiaolan Liao,Huan Li
SiO 2 aerogels have drawn significant attention for waterborne thermal-insulation coatings in buildings owing to their excellent properties: low density, high porosity, and ultra-low thermal conductivity. However, their practical use is hampered by structural collapse upon direct exposure to coating solvents, leading to a notable loss of thermal insulation performance. To overcome this challenge, we proposed a bioinspired shell-protection strategy by constructing SiO 2 aerogel@PMMA core-shell fibers via coaxial electrospinning. The PMMA shell, inspired by animal epidermis, provided size-selective permeability: it blocked liquid penetration during waterborne coating preparation while allowing steam escape during drying of SiO 2 aerogel core layer. Meanwhile, mimicking the dermis of animal skin, the entangled molecular chains in PMMA shell dynamically resisted internal gas-expansion stress during the drying, maintaining structural integrity. The resulting fibers exhibited excellent mechanical and thermal insulation performance, with respective values of 35.47 MPa and 0.043 W/m·K, respectively. Furthermore, the prepared coatings also presented exceptional mechanical and thermal insulation properties, with respective values of 13 MPa and 0.059 W/m·K. This work will provide a new and effective pathway for SiO 2 aerogels to remain stable and fully exert their thermal insulation efficacy in building coatings.
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高影响因子
ANALYTICAL CHEMISTRY
·
2026
·
IF 7.3
Qianqian Jiang,Renlong Chen,Tong Zhang,Hao Shen,Cheng Zhang,Kui Zhang,Zhongping Zhang
Lateral flow immunochromatographic assay (LFIA) features advantages such as a rapid analysis process, interpretable detection results, and low cost, making it an effective method for on-site detection of pesticides. However, the existing LFIA technologies still face bottleneck issues, including strong background fluorescence interference from the substrate and insufficient detection sensitivity for low pesticide residue levels. Here, long-lived room-temperature phosphorescent carbon dots embedded in silica (CDs@SiO2) were developed to overcome background fluorescence interference. Fe3O4 coated with dopamine (Fe3O4@PDA) was utilized for the enrichment of target pesticide molecules. Meanwhile, by virtue of the quenching effect of Fe3O4@PDA on CDs@SiO2, colorimetric and phosphorescent dual-mode LFIA technology was designed for the detection of the pesticide acetamiprid. Through the integration of the advantages of CDs@SiO2 and Fe3O4@PDA, the limit of detection (LOD) for acetamiprid was as low as 0.271 ng/mL, and satisfactory recoveries were achieved in real samples. This research breaks through the millisecond-level lifetime limitation in traditional time-resolved fluorescence immunoassays, providing novel insight for the development of labeling materials for LFIA.
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DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2024
·
IF 9.7
Ziyuan Li,Yangjun Wang,Huan Wang,Shuai Zhang,Zhen Shang,Limei Tian,Yuying Yan
Utilizing salt-based shape-stabilized phase change materials (ss-PCMs) for high-temperature thermal energy storage stands as a pivotal avenue in realizing carbon neutrality . However, the performance of ss-PCMs significantly deteriorates after thermal cycling. This study utilizes rice husk carbon (RHC) with an in-situ SiO 2 –C interconnected structure as the encapsulating material, along with expanded graphite (EG) and MgO , to encapsulate ternary chloride (TC). In this approach, RHC simultaneously acts as a thermal conductivity materials (TCM) and a ceramic supporting material (CCM). The results showed that this encapsulation method can effectively encapsulate up to 65% of TC. The 60 wt% TC-10 wt% RHC-10 wt% EG-20 wt% MgO sample named 60T/10R/10E/20M is considered a close to optimal formulation in terms of thermal conductivity and phase change enthalpy . This ss-PCM has a thermal conductivity of 8.86 W m−1 K−1, and phase change enthalpy of 153.6 J g−1. The ss-PCMs maintained shape stability even after 1000 cycles, with minimal mass loss and thermal conductivity degradation compared to the non-RHC-added ss-PCM. This study has prepared high performance and reliability thermal storage materials through a green and low-cost approach.
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高影响因子
危险品化学品经营许可证（带存储）