CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Baolu Shi,Zhiliang Zhou,Yu Chen,Xinqiao Wang,Baosheng Xu
SiO 2 aerogels have an inherent optical transparency, but there is a hydrophilic defect and high transparency and hydrophobicity seem impossible to achieve at the same time. In order to realize the practical application value of highly transparent aerogel, our study used hexamethyldisilazane (HMDS) as the hydrophobic agent to improve the hydrophobicity of the prepared highly transparent SiO 2 aerogels. We investigated the effects of HMDS concentration and modification duration on SiO 2 aerogels through the chemical liquid method. Results showed that the concentration and modification time of HMDS have no significant effect on the microstructure and properties of highly transparent SiO 2 aerogels, which maintained uniform microstructure, low thermal conductivity , good thermal stability and contact angles were all above 136°. Hydrophobic and highly transparent SiO 2 aerogels hold great potential for use as observation windows in the aerospace applications, building thermal management, and transparent coating.
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ACS Applied Electronic Materials
·
2023
·
IF 4.7
Xiaoting Liu,Wenya Chen,Jiapeng Yang,Xiaojuan Liang,Xiaoli Fang,Weidong Xiang
As we all know, the various excellent properties of perovskite nanocrystals (NCs) have attracted attention in recent years. However, thei work stability is still the bottleneck to be solved urgently in their commercialization process. In this study, we encapsulated CsPbBr3 quantum dots in nano-SiO2 (inorganic) by a high-temperature sintering method and investigated the changes in optical stability before and after encapsulation. The SiO2 shell can effectively suppress anion exchange and photodegradation, which greatly improves the photothermal stability of shell NCs. Preparation of composite films by mixing CsPbBr3–SiO2 (inorganic) and polymer material PMMA (organic) by a solvent solution method can further enhance its stability. Meanwhile, the backlight display device realized the practical application of CsPbBr3–SiO2/CsPbBr1.2I1.8@PMMA with a wide color gamut (112% of the NTSC, 84% of the Rec. 2020). This is a very significant step to open up the awkward situation of the practical application of perovskite NC materials in backlight displays.
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ACS Applied Energy Materials
·
2022
·
IF 6.959
Jiachen Han,Da Xu,Chun Sun,Hu Zhang,Tong Wei,Jiaqi Tao,Chao Fan,Wengang Bi
Perovskites have gained significant attention due to their excellent optoelectronic properties. However, the poor stability of perovskites hinders their practical applications. To address this issue, we propose a facile approach to synthesize stable CsPbBr3 nanomaterials by embedding them into a SiO2 matrix followed by an in situ PbSO4 shell coating on their surfaces. After the encapsulation, the CsPbBr3@PbSO4/SiO2 powder exhibits high photoluminescence quantum yield (PLQY, ∼85%) due to reduced defects. Most importantly, the CsPbBr3@PbSO4/SiO2 powder shows robust stability under many harsh conditions, such as maintaining its PL in water (for 1 year), concentrated hydrochloric acid (HCl) aqueous solution and hydrobromic acid (HBr) aqueous solution (for 25 days), boiling water (for 24 h), high temperature (500 °C for 24 h), and light irradiation (365 nm for 3 months). This work not only provides a strategy for the facile preparation of ultrastable and efficient perovskites but also shows great potential for practical applications such as solid lighting and backlight displays.
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ACS Applied Nano Materials
·
2022
·
IF 6.14
Chai Yumei,Wang Gang,Shi Pei,Hongjie Luo,Zhao Xichen,Zhang Biao,Jianfeng Zhu
Exploring and developing an efficient protective coating for precious stone heritages that have been exposed to sunlight and rain for a long time is crucial. The UV resistance properties of nano-ZnO are apparent. Nano-SiO2 has a stable chemical structure and is one of the main components of stone. This paper introduces the synergistic protective effect of ZnO nanoparticles (ZnO-NPs) and SiO2 nanoparticles (SiO2-NPs) on stone, which is novel in this field. The functional nanocomposite coating (FZS coating) was obtained by spraying the ultrasonic mixture of ZnO-NPs and SiO2-NPs, cross-linked with a silane coupling agent, and modified by fluorocarbon. Wettability and UV aging tests showed that the sandstone deposited by FZS coating had excellent amphiphobicity (water contact angle (WCA) > 160°, oil contact angle (OCA) < 140°). The hydrophobicity was almost changeless after 300 h of UV irradiation, indicating high UV absorption capacity and durability. Interestingly, the amphiphobicity remains unchanged after alternating treatments of temperature and humidity, expressing superior weathering stability. This facile functional coating has potential applications protecting outdoor stone heritages.
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Batteries-Basel
·
2022
·Vol. 8
·期 10
·175
·
IF 5.938
Peishu Tian,Xin Zhong,Caiting Gu,Zhe Wang,Fengwei Shi
Aqueous Zn-ion batteries (AZIBs) are quite promising energy sources. However, aqueous electrolytes present many challenges such as hydrolysis reactions, liquid leakage, Zn dendrites, and interfacial side reactions. To solve the above problems of aqueous electrolytes, in this study, a kind of SiO2-sodium alginate gel polymer electrolyte (SiO2-SA GPE) is prepared through a one-pot method. The SiO2-SA GPE possessed high ionic conductivity of 1.144 × 10−2S·cm−1and perfect mechanical strength. The Zn//LiFePO4batteries assembled with SiO2-SA GPE delivered a high discharge specific capacity of 89.9 mAh g−1(capacity retention = 74.9%) after 300 cycles at 1 C, which was much better than traditional liquid electrolytes (residual discharge capacity = 79.2 mAh g−1). Results of the rate performance and long cycle life of AZIBs proved that SiO2-SA GPE could effectively prevent zinc dendrites and side reactions, providing a feasible strategy for improving the performance of AZIBs.Keywords:aqueous zinc-ion batteries;sodium alginate;SiO2;gel polymer electrolytes;dendrite restriction
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DYES AND PIGMENTS
·
2022
·
IF 5.122
Sheng-Tong Wu,Fan Yang,Chun-Qin Zhao,Lai-Di Xu,Xue-Lian Han,Ping Chen,Shou-Nian Ding
Traditional photonic crystal microspheres have internal pores and can only be fabricated by self-assembly of colloidal nanoparticles . Therefore, their internal vulnerability to contamination and poor structural stability limit their further application. Therefore, we proposed a new method of photonic crystal composite microsphere fabrication by combining polymerisation with the self-assembly process. The droplets composed of colloidal nanoparticles, monomer , and initiator in continuous phase are obtained by a Shirasu porous glass (SPG) membrane emulsification undergo polymerised and self-assembled to obtain organic-inorganic photonic crystal composite microspheres. Since the self-assembled colloidal nanoparticles are immobilized in the polymer cross-linked network, the composite microspheres exhibit high structural stability. Based on this, we fabricated SiO 2 -PHEMA photonic crystal composite microspheres by polymerisation and self-assembly process. Compared with the pure SiO 2 photonic crystal microspheres fabricated by the same method, the composite microspheres exhibit high structural stability, color saturation, and good hydrophobicity due to the self-curling of the material driven by hydrogen bonding during polymerisation. In addition to the potential applications as dyes, biosensors, and in light, these composite microspheres overcome the difficulty of bulk generation of traditional photonic crystal microspheres and have the potential for industrialized mass production.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
You-Yong Wang,Yuan-Qing Li,Shan-Shan Xue,Wei-Bin Zhu,Xiang-Qian Wang,Pei Huang,Shao-Yun Fu
Development of lightweight structural materials from fast-growing bamboos is of great significance to building a sustainable society. However, previously developed structural bamboos by delignification combined with densification would easily fail under large external loading after exposure to water due to structure collapse, severely limiting their practical applications. Here, we demonstrate an ultrastrong and exceptional environmentally stable bamboo composite consisting of a graphene oxide (GO)/bamboo core and hierarchical SiO2 protection layer. The GO/bamboo composite exhibits ultrahigh tensile strength (641.6 MPa), superb flexural strength (428.4 MPa), and excellent toughness (17.5 MJ/m3), which are increased by about 480, 250, and 360% compared with natural bamboo, respectively. As a result, the specific tensile strength of the GO/bamboo composite is up to 513.3 MPa·cm3/g due to its low density (1.25 g/cm3), outperforming engineering structural materials such as aluminum alloys, steels, and titanium alloys. These large improvements benefit from the well-preserved bamboo scaffold and the strong hydrogen bonds between bamboo fibers and GO nanosheets. On the other hand, the SiO2@GO/bamboo composite shows superhydrophobicity due to the construction of hierarchical SiO2 layers, which endows it with outstanding water resistance. Moreover, the bamboo composite shows an ultralow coefficient of thermal expansion (≈2.3 × 10–6 K–1), indicating its excellent dimensional stability. Considering the ultrahigh mechanical performance and outstanding environmental stability, the developed lightweight SiO2@GO/bamboo composite is hopeful to be a green and sustainable structural material for practical engineering applications.
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Lin-Lin Zhu,Min-Min Dai,Xin Xu,Guang-Xiang Zhang,Yu-Jian Jian,Cheng-Cai Zhao,Hua-Tay Lin
In this study, B 4 C–SiO 2 was employed as the joining material via a screen-printing method to join alumina (Al 2 O 3 ) ceramics at 1000 °C in ambient air. Effects of mass ratios of B 4 C and SiO 2 ranging from 1:0.5 to 1:2.5 on the composition, microstructure, and mechanical properties of the joints were investigated. When the content of SiO 2 was equal or greater than that of B 4 C, the interlayer of the brazed joints was defect-free and consisted of Al 4 B 2 O 9 whiskers and calcium borosilicate glass based on microscopically electronic analyses. With the content of SiO 2 increased, the shear strength of the joints increased first and then decreased. The average shear strength of the joint reached the maximum value of 110 ± 19 MPa when the mass ratio of B 4 C to SiO 2 was 1:2. The current study demonstrated that the screen-printed B 4 C–SiO 2 system could be a very beneficial approach to obtain high strength Al 2 O 3 joints with defect-free interlayer at relatively low joining temperatures in air.
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Nano-Micro Letters
·
2022
·Vol. 14
·期 1
·1-20
·
IF 23.655
Song Limeng,Zhang Fan,Chen Yongqiang,Guan Li,Zhu Yanqiu,Chen Mao,Wang Hailong,Putra Budi Riza,Zhang Rui,Fan Bingbing
Traditional ceramic materials are generally brittle and not flexible with high production costs, which seriously hinders their practical applications. Multifunctional nanofiber ceramic aerogels are highly desirable for applications in extreme environments, however, the integration of multiple functions in their preparation is extremely challenging. To tackle these challenges, we fabricated a multifunctional SiC@SiO 2 nanofiber aerogel (SiC@SiO 2 NFA) with a three-dimensional (3D) porous cross-linked structure through a simple chemical vapor deposition method and subsequent heat-treatment process. The as-prepared SiC@SiO 2 NFA exhibits an ultralow density (~ 11 mg cm − 3 ), ultra-elastic, fatigue-resistant and refractory performance, high temperature thermal stability, thermal insulation properties, and significant strain-dependent piezoresistive sensing behavior. Furthermore, the SiC@SiO 2 NFA shows a superior electromagnetic wave absorption performance with a minimum refection loss ( RL min ) value of − 50.36 dB and a maximum effective absorption bandwidth ( EAB max ) of 8.6 GHz. The successful preparation of this multifunctional aerogel material provides a promising prospect for the design and fabrication of the cutting-edge ceramic materials.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Yuxiang Shen,Huan Liu,Raz Muhammad,Yang Yao,Xueqing Yu,Alexander Korotkevich,Minmin Mao,Lei Cao,Bing Liu,Haishen Ren,Huixing Lin,Matjaz Spreitzer,Mikhail P. Kuz'min,Ruzhong Zuo,Kaixin Song
In this study, 21.9 mol% MgO - 20.3 mol% Al 2 O 3 - 54.6 mol% SiO 2 + 1.6 mol% MnO 2 + 1.6 mol% ZnO and 23.1 mol% MgO - 20.9 mol% Al 2 O 3 - 55.0 mol% SiO 2 + 1.0 mol%GeO 2 were prepared by low-temperature co-firing method. The effects of nucleating agents and sintering temperature on the crystallization behavior, microstructure and microwave dielectric properties of MASMZ and MASG glass-ceramics were investigated. It was found that both glass-ceramics were able to precipitate stable α-cordierite crystalline phases at relatively low temperatures. Crystallization kinetics analysis showed that MASMZ glass-ceramics crystallized more easily than MASG glass-ceramics. MASMZ glass-ceramics exhibited optimal dielectric properties at 925 °C: ε r = 4.74, tan δ = 8.1 × 10 −4 , τ f = -14 ppm/°C. MASG glass ceramics achieved optimal dielectric properties at 950 °C: ε r = 4.46, tan δ = 1.11 × 10 −3 , τ f = -27 ppm/°C. Especially, the excellent chemical stability and compatibility of MASMZ and MASG glass-ceramics with silver at high temperatures were verified, indicating the potential of MASMZ and MASG glass ceramics as LTCC substrate materials.
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CHINESE JOURNAL OF CATALYSIS
·
2018
·
IF 3.525
Dawei He,Danhua Yuan,Zhijia Song,Yunpeng Xu,Zhongmin Liu
Zeolite synthesis in contemporary chemical industries is predominantly conducted using organic structure-directing agents (OSDAs), which are chronically hazardous to humans and the environment. It is a growing trend to develop an eco-friendly and nuisanceless OSDA for zeolite synthesis. Herein, choline is employed as a non-toxic and green OSDA to synthesize high silica Y zeolite with SiO 2 /Al 2 O 3 ratios of 6.5–6.8. The prepared Y zeolite samples exhibited outstanding (hydro)thermal stability at ultrahigh temperature owing to the higher SiO 2 /Al 2 O 3 ratio. The XRF, SEM, 29 Si-NMR and 13 Na+ results suggested that choline plays a structure-directing role in the synthesis of Y zeolite, while the feed molar fraction of Na + is a crucial determinant for the framework SiO 2 /Al 2 O 3 ratio and the crystal morphology.
研究领域:
材料科学
·
环境科学
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JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2024
·
IF 1.9
Xinyuan Li,Meifei Niu,Junjie Zhang,Zhuoping Yu,Jun Xu,Guangyu Sun
Wax precipitation and deposition are challenging hurdles in pipeline transportation of waxy crude oil. This study focuses on transforming SiO2, Laponite, and montmorillonite particles into hydrophobic particles through polymer grafting. Chemical structure analysis and grafting ratio calculation were performed. Through thermogravimetric analyzer (TGA) test, Laponite showed the highest grafting ratio. The effects of adding nanocomposites, TDA-2024-22, and commercial pour point depressants on the rheological behavior and wax crystallization behavior of African crude oil were compared. Addition of the nanocomposite PDA-22@SiO2 to crude oil, reduced the viscosity by 85.6% at 20 °C and the thixotropy by 60.2%. Wax crystal size decreased in the order of PDA-22@SiO2, PDA-22@Laponite, KS-10, TDA2024-22, and PDA-22@MMT. The pour point decreased by 6 °C with PDA-22@ SiO2 particles but only 3 °C with Laponite and montmorillonite composites. Spherical nanocomposites are promising flow improvers for waxy crude oil.
研究领域:
石油工程
·
材料科学
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