COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Yulan Jian,Mengke Huang,Tianlu Xu,Shuai Chen,Hui Wan,Linkun Xie
The biomimetic construction of superhydrophobic coatings on wood surfaces significantly reduces the water absorption capacity of wood while enhancing its deformation resistance, thereby extending the service life of wooden structures. In this work, a fluorinated silica sol was prepared from alkaline silica sol and 1H,1H,2H,2H-perfluorodecyltrimethoxysilane (PFDMS), and evenly sprayed over the wood surface to effectively produce superhydrophobic/oleophobic wood specimens. The effect of the preparation procedure of fluorinated silica sol on the wettability of the coating was investigated. Acid and alkali corrosion tests were conducted to assess the chemical stability of the superhydrophobic coating, while sandpaper abrasion tests were used to evaluate its mechanical stability. The results showed that with a volume ratio of silica sol to PFDMS of 6:1 and a reaction period of 30 min, the modified wood exhibited excellent superhydrophobicity, with a water contact angle of 157.3° and an oil contact angle of 126.5°. Furthermore, the superhydrophobic coating demonstrated excellent mechanical and chemical durability, along with self-cleaning properties. These findings have significant practical implications for enhancing the performance and longevity of wood.
研究领域:
材料科学
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表面工程
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2020
·Vol. 13
·期 20
·4478
·
IF 3.057
Qiangqiang Liu,Yubo Chai,Lin Ni,Wenhua Lyu
This paper presents experimental research on the flame-retardant properties and thermal decomposition kinetics of wood treated by boric-acid-modified silica sol. The poplar wood was impregnated with pure silica sol and boric-acid-modified silica sol. The results showed that modifiers can be observed in the cell wall and cell lumen. The ignition time, second peak of the heat release rate, total heat release, and mass loss of the W-Si/B were delayed obviously. The composite silicon modification had a positive impact on carbonization. Thermogravimetric analysis showed that the residual mass of W-Si/B was enhanced and the thermal degradation rate was considerably decreased. By thermal decomposition kinetics analysis, the boric acid can catalyze the thermal degradation and carbonization of poplar wood. In other words, wood treated with boric-acid-modified silica sol showed significant improvement in terms of flame retardancy, compared with wood treated with common silica sol.Keywords:poplar wood;silica sol;boric acid;cone calorimetric;decomposition kinetics
研究领域:
材料科学
·
林业工程
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DOI
PubMed
高影响因子
Crystals
·
2022
·Vol. 12
·期 2
·144
·
IF 2.67
Shun Zhou,Xiaotao Zhang,Han Zhou,Dongxu Li
In the present research work, the ternary effects of varying dosages of graphene oxide encapsulated silica fume (GOSF), nano-silica sol (SS), and fly ash (FA) on the rheological properties, compressive strength, the content and crystal size of calcium hydroxide (CH), porosity, water absorption, and microstructure of cement were studied. The results showed that the incorporation of SF improved the dispersion of GO in the cement matrix. GOSF was prepared through electrostatic attraction between the positively charged SF and negatively charged GO. The ternary mixture of GOSF, SS, and FA had a synergistic effect that improved the performance of cement. When the curing age of cement reached 28 days, the compressive strength reached a peak of 86.5 MPa, the minimum values of content and crystal size of CH were 11.55% and 45.69 nm, respectively, and the minimum values of water absorption and porosity were 0.0011 cm/s0.5and 13.56%, respectively. In terms of microstructure, the denser structure of C-S-H gel and the regular arrangement of CH were noticed.Keywords:silica fume;silica sol;graphene oxide;fly ash;orthogonal experiment
研究领域:
土木工程
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材料科学
✓ 已验证
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DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2024
·
IF 1.8
Danyang Qiu,Shujing Li,Yuanbing Li,Zhen Cai,Chengzhen Fu,ChangDong Wei
Fiberboard (FB) is extensively utilized in heat-insulating refractory materials owing to its lightweight nature and excellent resistance to high temperatures. Nevertheless, the inadequate mechanical properties and limited dimensional stability of FB hinder its further application. The vacuum filtration was utilized in this study to manufacture inorganically modified insulation FB, incorporating plus fiber/1260 fiber and silica sol as the primary constituents and sepiolite powder (HS) as the modifier. The experimental results show that the fabricated samples exhibited extremely high porosity (75.3%–90.2%) and low thermal conductivity (.063–.15 W m −1 K −1 , 200–800°C). The fibers were arranged in a three-dimensional structure, overlapping with each other, and the silica sol adhered to the fibers, forming a spatial mesh structure through cross-linking. Importantly, the incorporation of HS was effective in controlling the agglomeration of the silica sol, leading to a more uniform distribution within the fibers. Additionally, the study found that the mechanical properties (high hardness (64–72 HA)) and high-temperature durability of the FBs were enhanced due to the flocculant modification. This study highlights promising prospects for industrial applications and offers a cost-effective admixture for modifying and preparing high-performance FBs, which is expected to see broad adoption in thermal insulation and energy conservation applications.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2019
·Vol. 91
·期 1
·44-53
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IF 1.986
Cai Huafei,Jiang Yonggang,Li Liangjun,Feng Junzong,Feng Jian
Abstract Monodispersed silica sol with a small particle size, narrow size distribution, and high conversion was prepared via a modified Stöber method, and an orthogonal test method was used to investigate the influence of TEOS concentration, R (H 2 O/TEOS), ammonia concentration, and reaction temperature on the particle size, size distribution, and conversion of silica sol. It was found that the remarkable factors affecting the particle size from a large to a small order were ammonia concentration, reaction, temperature, and R (H 2 O/TEOS) value; similarly, the remarkable factors affecting the silica sol conversion from a large to a small order were the R (H 2 O/TEOS) value and reaction temperature in decreasing order of influence. None of the factors investigated in this study exhibited a significant effect on the particle size distribution. The optimal synthesis conditions for the preparation of monodispersed silica sol with small particle size and high conversion were as follows: TEOS concentration = 0.4 mol/L; R (H 2 O/TEOS) = 60; ammonia concentration = 0.10 mol/L; reaction temperature = 75 °C. The average particle size of monodispersed silica sol under optimum conditions was 5.25 ± 0.77 nm, and the conversion was 94.05%. Besides, this study also provides a systematic experimental and theoretical basis for the preparation of different particle sizes monodispersed silica sol with high conversion.
Monodispersed silica sol with small particle size, narrow size distribution and high conversion was prepared via a modified Stöber method, and orthogonal test method was used to investigate the influence of TEOS concentration, R (H 2 O/TEOS), ammonia concentration and reaction temperature on the particle size, size distribution and conversion of silica sol. Under the optimum conditions, the monodispersed silica sol with 5.27 ± 0.82 nm average particle size and 94.05% conversion rate was obtained.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
LANGMUIR
·
2018
·
IF 3.789
Xiangwei Kong,Jing Zhang,Qi Xuan,Junjie Lu,Jie Feng
In the past 10 years, many studies on superhydrophobic (SH) papers have been reported. However, these works are rarely carried out on Chinese paintings. Compared with pure paper, the complexity of Chinese black ink and pigment, caused by including animal glue and fixatives allowing the nanoparticles to disperse in water, negatively affects the formation of SH coatings. In this work, we report the fabrication of SH coatings using fluorine silicon sol containing an epoxy group on Chinese paintings. Briefly, SiO2 nanoparticles were mixed with KH560 and FAS-17 and formed fluorine silicon sol. Then the sol was coated on the Chinese paintings. After drying, the SH coating was created. It can protect Chinese paintings and prevent them from being fouled by various liquids. Six types of beverages and ink can be repelled by the as-prepared SH coatings. Moreover, Chinese black ink can also be washed away from the SH coatings using water, without leaving any traces of ink behind. The SH coatings did not affect the appearance and internal structure of the Chinese paintings. Furthermore, due to covalent link, the SH coatings have good mechanical properties with regard to bending tests (120 times), finger pressing tests, and friction tests. The SH coatings also show an excellent high temperature resistance. This study has important applications for antifouling of Chinese paintings or oil paintings from dirty water.
研究领域:
材料科学
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文物保护
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Ke Wang,Wei Gao
Efficient thermal insulation and flame-retardant materials are crucial in reducing energy consumption and minimizing fire hazards. This work presents a novel method for preparing a composite aerogel: a silane coupling agent was used as a chemical bridge to synthesize a new flame retardant AKH (modified APP with HNTs). AKH was incorporated into the silica sol to fabricate the SA-AKH composite aerogel. SA-AKH features a dense three-dimensional network skeletal structure, excellent thermal stability, and a high specific surface area. When integrated into organosilicon resin, SA-AKH significantly enhances the flame resistance of composite materials. During cone calorimetry testing (CCT), SSAKH4 exhibited a peak heat release rate (PHRR) of 281.88 kW/m 2 and total smoke production (TSP) of 5.52 m 2 , representing a decrease of 30.8 % and 4.5 %, respectively, compared to SSA4. The composite material, derived from the unique mesoporous structure of aerogel combined with the flame retardant and hollow characterization of AKH, demonstrates exceptional flame retardancy and smoke suppression. SA-AKH is expected to make novel advancements in the field of high-efficiency insulation and flame-resistant composites.
研究领域:
材料科学
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能源工程
·
防火材料
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DOI
高影响因子
GLASS PHYSICS AND CHEMISTRY
·
2025
·Vol. 50
·期 3
·313-322
·
IF 0.6
Jiefang Li,Kong Que,Zhang Dan,Li Zhiguang
Self-cleaning materials played an important role in our daily life, but there remained some critical challenges such as complex fabrications, non-transparency, and poor long-term stability, which limited their applications. In this paper, acid-base silica sol and alkali-based silica sol were prepared by sol-gel method, with ethyl orthosilicate as the precursor. The two silica sols were mixed by different proportions. The mixed silica sol was evenly coated on the surface of the pretreated glass slide, and then modified by the low surface energy substance HDTMS and QX-18 fluorocarbon nanocoating, and finally prepared a hydrophobic and wear-resistant transparent coating. The surface topography of the coating was analyzed, and its acid and alkali resistance, wear resistance, self-cleaning performance and other properties were tested. The results showed that the optimal volume ratio of acid-base mixed sol was acid silica sol : alkaline silica sol = 3 : 7. The hydrophobic coating had good wear resistance, transparency, self-cleaning and acid resistance, but poor alkaline resistance.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
SURFACE ENGINEERING
·
2025
·
IF 2.6
Chong Ke,Chenhua Zhang,Yongdong Jiang
In this study, durable antifogging coatings were fabricated on glass substrates by simply applying a mixture of silica sol and TweenⓇ40. The effects of TweenⓇ40 loading on the properties of the coatings were scrutinized. The coatings demonstrate good antifogging behavior, as no fog or haze was observed on the coated specimen when exposed to hot water steam at 85°C. The optimal coating retains its antifogging property for a notable 12 weeks. The antifogging behavior is mainly provided by TweenⓇ40 within the coating. Meanwhile, the silica sol in the coating serves as a matrix or host for TweenⓇ40, thereby enhancing the coating's robustness.
研究领域:
材料科学
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表面工程
·
应用化学
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DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2018
·Vol. 26
·期 4
·1017-1025
·
IF 1.858
Liu Zhen,Zhao Liang,Zhang Tingting,Wang Yu,Xu Yanyan,Komarneni Sridhar,Wang Yi,Liu Xinmei,Yan Zifeng
The traditional silicon sources for beta zeolite synthesis are solid silica gel, carbon-white or tetraethyl orthosilicate (TEOS), which makes the material cost even higher. Herein, beta zeolite synthesis by hydrothermal method with industrial silica sol as silicon source was investigated. The effects of synthesis conditions on product property were investigated in detail, including template content, crystallization temperature, crystallization time and alkalinity of hydrothermal system. The products properties, such as crystallinity, pore structure, morphology and acid properties were thoroughly characterized by XRD, N 2 adsorption–desorption isotherm, SEM, TEM, Py-FTIR and NH 3 -TPD. The optimum condition for synthesis of beta zeolite using industrial silica sol as silicon source was finally determined. Compared with commercial beta zeolite, the as-synthesized beta zeolite had higher relative crystallinity, higher total and microporous specific surface area with higher total concentration and B/L ratio of acid sites.
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
THIN SOLID FILMS
·
2022
·
IF 2.358
Xuyang Zhang,Jiaqi Shan,Shengchi Bai,Xingzhong Guo,Xiaoyu Zhao,Hui Yang
A robust, flexible and transparent silver nanowires(AgNWs)/silica sol/poly(3,4-ethylene dioxythiophene)/poly(styrene sulfonate) (PEDOT:PSS) composite film was fabricated for film heater via spray-coating AgNWs ink, silica sol and PEDOT:PSS onto the surface of polyethylene glycol terephthalate substrate in turn. Silica sol nanoparticles are absorbed around the AgNWs to improve the connection between AgNWs by capillary effect, and the PEDOT:PSS covers on the surface of AgNWs/silica sol layer to increase the network conductive paths and protect the AgNWs/silica sol layer. The AgNWs/silica sol/PEDOT:PSS composite film shows a sheet resistance of 12 Ω/sq, a transmittance of 87.5% at 550 nm and a Joule heating temperature of 99 °C at 15 V. The composite film with high mechanical stability, low surface roughness and corrosion resistance is promisingly used in window defrost and deicer system.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Peng Ye,Jianwen Peng,Fei Xu,Haolei Geng,Yanji Zhu,Huaiyuan Wang
Amphiphobic coatings with the anti-reflective property offer a promising strategy to mitigate the degradation of photovoltaic conversion efficiency in solar cells caused by fouling and reflection of incident light. Despite advancements in developing transparent and liquid-repellent coatings, achieving integration of both properties still poses a significant challenge. In this work, a unique nanostructure coating with extremely low roughness and surface energy is constructed by integrating fluorinated cluster core-shell structured silicon sols (BASSF) into a self-made silicon precursor (S P) using a template-free two-step base/acid-catalyzed reaction. The exceptional anti-fouling performance of the S-P@BASSF coating is a result of the chemical inertness of the polymer and the unique structure of the sol-gel particles. This innovative approach provides a potential solution for fabricating high-performance coatings and materials. The coating is capable of recovering to 97 % of its initial efficiency swiftly, even after severe dust contamination. The coating exhibits remarkable anti-reflective property due to the combination of sol particles with varying refractive indices . The coating also displays high weathering resistance, maintaining contact angles with water (≥105°) and diiodomethane (≥85°) even after prolonged exposure to UV lamps, high temperature and high humidity weather. The results obtained in this study show that nanocomposite coatings via the preparation of smooth, high refractive index and low reflectivity have great potential for outdoor applications such as energy harvesting and optical instruments under wet conditions.
研究领域:
材料科学
·
能源技术
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）