Thermal Science and Engineering Progress
·
2025
·
IF 5.4
Yunpeng Yang,Lilong Nie,Yongkang Guo,Zhuoxuan Li,Sicheng Xu,Linlin Yi,Kaiyuan Li
To address the environmental risks posed by PFOS-containing fire extinguishing agents, the development of highly efficient and environmentally friendly fluorine-free foam extinguishing agents has become a forefront research area in the firefighting community. In this study, a novel foam extinguishing agent was prepared using the nonionic silicone surfactant SiCare2238 and the amphoteric hydrocarbon surfactant LAMC as core components, with hydrophilic nano-SiO₂ particles (NPs) introduced to construct a gas–liquid-solid three-phase fluorine-free foam system. By regulating the NP concentration, the interactions of NPs and surfactants and the resulting effects on the foam performance were investigated. The results indicate that when the NP concentration is < 1 wt%, the charge interactions between particles and surfactants weaken the interfacial adsorption, leading to accelerated drainage and coarsening, thereby reducing the foam stability. In contrast, when the NP concentration is ≥ 1 wt%, the particles form a dense network in the Plateau borders, blocking the Plateau channels, resulting in a 47.4 % reduction in drainage within 30 min and a 30 % decrease in coarsening rate, significantly enhancing the foam stability. Moreover, the fire extinguishing and burn-back experiments demonstrated that the SN-7# system with 5 wt% NPs achieved a 90 % flame control time of 17 s and an extinguishing time of 26 s, outperforming the commercial AFFF and the NP-free SN-0#. The addition of NPs significantly enhances fire suppression efficiency, as they interact with surfactants in foam films and Plateau borders to form aggregated network structures, effectively delaying the drainage and coarsening, thereby improving the foam’s thermal stability and burn-back resistance. The findings of this study provide theoretical guidance for the development and application of NPs in fluorine-free foam extinguishing agents.
研究领域:
消防工程
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材料科学
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界面化学
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燃烧学
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环境友好材料
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 13
·8153-8164
·
IF 3.917
Yang Maiping,Liu Weiqu,Jiang Chi,Xie Yankun,Shi Hongyi,Zhang Fengyuan
Abstract Self-cleaning, photocatalysis and UV shielding cotton fabric was fabricated through a mild, facile and efficient method via ZnO/polydimethylsiloxane coatings. No fluorinated materials were employed during the preparation process. The modified cotton presented a high superhydrophobicity, with a water contact angle of 160.4° and water shedding angle of 6.0°. The SEM, EDS and XPS tests were used to investigate the differences of microstructures and chemical compositions of fabrics before and after coating. The robustness of the coated fabric was demonstrated in many aspects, such as immersing in acid and basic solutions, different organic solvents and abrasion test. In addition, the as-prepared superhydrophobic surface displayed excellent self-cleaning due to the synthesis function of superhydrophobicity and photocatalysis. The UV durability and UV shielding characteristics were also investigated. These properties promote the multifunctional cotton fabric as a satisfied candidate in various promising fields. Graphic abstract
研究领域:
材料科学
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纺织工程
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表面化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 7
·4542-4552
·
IF 3.9
Bin Yu,Huicong Liu,Haining Chen,Weiping Li,Liqun Zhu,Weitao Liang
Hydrophobic coatings have attracted extensive research due to their broad application prospects. However, hydrophobic coatings in practical applications are often limited by their insufficient stability and are difficult to be applied on a large scale. In this regard, wear and heat resistance are key aspects that must be considered. In this paper, a method for preparing a robust hydrophobic coating with modified ZrO2 particles as the core component and modified acrylic resin is proposed. First, γ-aminopropyltriethoxysilane (APTES) was used to silanize ZrO2 to obtain Si–ZrO2 nanoparticles, which were grafted with amino groups. Then, the nanoparticles reacted with isocyanates to be grafted with hydrophobic groups. A simple spray method was developed to deposit a hydrophobic (141.8°) coating using the mixture containing the modified nanoparticles and non-fluorinated water-based silicon-modified acrylic resin (WSAR) that was prepared by free radical polymerization. The obtained coating exhibited a rough surface and the particles and resin were closely combined. Compared with pure resin coating, the composite coating exhibited 150% enhancement in wear resistance and it could wear 45 meters at a pressure of 20 kPa. Moreover, the coating could maintain the hydrophobic property even when it lost 70% quality or after it was heated at 390 °C. The thermogravimetric results showed that the temperature could reach 400 °C before the quality of the fluorine-free coating dropped to 90%. In addition, the coating could easily take away graphite or silicon carbide powder under the impact of water droplets, showing excellent self-cleaning performance.
研究领域:
材料科学
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表面化学
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涂层技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Xin Jing,Xia Li,Yifei Jiang,Ruhe Zhao,Qijun Ding,Wenjia Han
Collagen fiber has attracted much attention due to its good biocompatibility and biodegradability . In the present research, we prepared a type of non-fluorine hydrophobic and oil-resistant material using collagen fiber, chitosan, and polydimethylsiloxane (PDMS) as raw materials. To improve oil/grease resistance, the first layer filled the porous matrix and was made from the cross-linking product of collagen fiber/chitosan and glutaraldehyde . This was followed by a simple coating of PDMS, to increase hydrophobicity and water resistance. Notably, 10 g/m 2 of cross-linking product and 6 g/m 2 of PDMS had a low pore size as well as a smooth and uniform surface, which made the composites exhibit excellent hydrophobic and oil-resistant properties (water contact angles of 141°), water and oil resistance (kit rating value of 12/12) and mechanical properties. Fluorine-free environment-friendly materials with high water and oil resistance play an important role in promoting the development of high-performance materials for food packaging.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Yunhe Zhang,Gaihuan Ren,Gaowei Nie,Shenpeng Hu,Wen Sun,Dongxiang Li,Zhenhua Cui,Yiming Li,Dongxu Lu,Hongqin Yu,Jianxin He
The demand for multifunctional, highly waterproof, and breathable nanofiber membranes is high due to their extensive applications in personal protection, outdoor equipment, and portable electronics. Nevertheless, the fabrication of such multifunctional waterproof-breathable membranes (WBMs) based on fluorine-free raw materials and a straightforward preparation process presents considerable challenges. Herein, this work proposes an easy and effective one-step electrospinning method for the fabrication of fluorine-free and multifunctional polyurethane (PU)/poly(styrene-b-butadiene-b-styrene) (SBS)/2-hydroxy-4-n-octyloxybenzophenone (UV531)/TiO2/stearic acid (SA) WBMs (PSUTS WBMs). The synergistic effect of organic absorber UV531 and inorganic blocker TiO2 provides the PSUTS nanofiber membrane with excellent UV protection. The incorporation of hydrophobic SA results in an optimized pore structure and surface hydrophobicity of the PSUTS WBMs, thereby enhancing their waterproof, breathable, and mechanical properties. By adjusting the amount of SA, eco-friendly and multifunctional PSUTS WBMs were systematically prepared, exhibiting exceptional UV protection performance (UPF, 399.45), high waterproof performance (76.2 kPa), satisfactory moisture breathability (5.23 kg m–2 d–1), and adequate tensile strength (5.4 MPa) and elongation at break (136.2%). The multifunctional PSUTS WBMs are expected to be utilized in various applications, providing optimal performance.
研究领域:
材料科学
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纳米技术
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 23
·5295
·
IF 4.967
Ling Zhang,Junlu Sheng,Yongbo Yao,Zhiyong Yan,Yunyun Zhai,Zhongfeng Tang,Haidong Li
Waterproof breathable functional membranes have broad application prospects in the field of outdoors textiles. The fluorine-containing microporous membranes of the mainstream functional products easily cause harm to the environment, and thus, the fluorine-free environmental nanofibrous membranes are an important development direction for functional membranes. In this subject, the electrospun polyacrylonitrile nanofibrous membranes were first hydrophobically modified by amino functional modified polysiloxane (AMP), followed by in situ cross-linking modified with 4, 4’-methyl diphenylene diisocyanate (MDI). The fluorine-free modification by AMP altered the surface of the membranes from hydrophilic to hydrophobic, and greatly improved the waterproof properties with the hydrostatic pressure reaching to 87.6 kPa. In addition, the formation of bonding points and the in situ preparation of polyuria through the reaction between the isocyanate in MDI and the amino group in AMP, could improve the mechanical properties effectively. When using AMP with the concentration of 1 wt% and MDI with the concentration of 2 wt%, the relatively good comprehensive performance was obtained with good water resistance (93.8 kPa), modest vapor permeability (4.7 kg m−2d−1) and air permeability (12.7 mm/s). Based on these testing data, the modified nanofibrous membranes had excellent waterproof and breathable properties, which has future potential in outdoor sports apparel.Keywords:electrospun polyacrylonitrile membranes;fluorine-free hydrophobic modification;amino functional modified polysiloxane;in situ cross-linking reaction;waterproof breathable
研究领域:
材料科学
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纺织工程
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 189
·期 1
·1-9
·
IF 5.833
Pei Ting,He Yu,Wang Yaping,Song Gongwu
Ti 3 C 2 MQDs were synthesized using an effective fluorine-free method with excitation/emission maxima at 390/490 nm and a fluorescence quantum yield of 11.78%. In contrast to the traditional, hazardous, and time-consuming process of HF pretreatment, our fluorine-free method is safe and simple. Acetylcholinesterase (AChE) could catalyze the hydrolysis of acetylthiocholine (ATCh) to produce thiocholine which was further reacted with Ehrman’s reagent and decomposed to form a yellow product 2-nitro-5-thiobenate anion (TNB). Due to the obvious overlap between the excitation spectrum of Ti 3 C 2 MQDs and the absorption spectrum of TNB, AChE catalyzed the hydrolysis of substrate DTNB/ATCh to form TNB, which can effectively quench the fluorescence of Ti 3 C 2 MQDs through the inner filter effect (IFE). However, the presence of organophosphorus (OPs) inhibited the activity of AChE, leading to a less expressed IFE and increasing recovery of fluorescence. This was used for the quantification of OPs with a detection limit of 0.20 μg·L −1 . Moreover, with the constant increase of AChE activity, the color of the reaction system changed visibly from colorless to yellow, and then from yellow to colorless with further continuous addition of OPs. A colorimetric detection with a paper-based sensor of AChE activity and OP concentration was also fabricated by analyzing changes in RGB value using a smartphone APP. In this work, we proposed an effective fluorescence/colorimetric two-mode detection method, which opened a new horizon to detect other targets. Graphical abstract
研究领域:
材料科学
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分析化学
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环境科学
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生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Yichang Yang,Xiangyu Meng,Longfeng Zhu,Jinghuai Yang,Guoliang Zhang,Hongxia Shen,Xuebo Cao
Rapid synthesis of Si-rich (SiO2/Al2O3 > 100) SSZ-13 zeolite under fluoride-free conditions is highly desirable but still challenging. Herein, we for the first time report a rapid synthesis of all silica and aluminosilicate (SiO2/Al2O3 > 100) SSZ-13 zeolite without the addition of fluoride species. The crystallization could be fully completed at 160 °C for 4 h when the aging of the starting gel is 3 h at room temperature after the addition of a zeolite seed. The key to success is the formation of more basic building units (4- and 6-membered rings) in the initial gel with the aging time of 3 h after the addition of a zeolite seed, leading to the successful rapid synthesis of Si-rich SSZ-13 zeolite. The obtained Si-rich SSZ-13 zeolite displays high crystallinity, uniform cubic morphology with a nanoparticle feature, and a large surface area. More importantly, the obtained Si-rich SSZ-13 zeolite displays excellent performance in the adsorption of ethanol and methanol-to-olefin reaction.
研究领域:
材料科学
·
化学工程
·
催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Fibers
·
2025
·Vol. 13
·期 8
·105
·
IF 3.9
Dongxu Lu,Yanbing Li,Yake Chai,Ximei Wen,Liming Chen,Sanming Sun
HighlightsWhat are the main findings?A fluorine-free, silicone-based polyurethane (SiPU) can be used as the only raw material for fabricating membranes, addressing environmental and health concerns associated with fluorine-containing materials.The membranes are produced via a simple, one-step electrospinning process that overcomes the complexity of the conventional preparation method.What is the implication of the main finding?The optimized SiPU nanofiber membrane demonstrates excellent water repellency (hydrostatic pressure of 52 kPa) and breathability (water vapor transmission rate of 5798 g·m−2·d−1), meeting key performance criteria.The optimized SiPU-14 nanofiber membrane exhibits high mechanical strength (tensile strength of 6.15 MPa) and ductility (elongation at break of 98.80%), enhancing durability, comfort, and practical applicability in protective textiles.High-performance waterproof and breathable nanofiber membranes (WBNMs) are in great demand for various advanced applications. However, the fabrication of such membranes often relies on fluorinated materials or involves complex preparation processes, limiting their practical use. In this study, we present an innovative approach by utilizing silicon-containing polyurethane (SiPU) as a single-component, fluorine-free raw material to prepare high-performance WBNMs via a simple one-step electrospinning process. The electrospinning technique enables the formation of SiPU nanofibrous membranes with a small maximum pore size (dmax) and high porosity, while the intrinsic hydrophobicity of SiPU imparts excellent water-repellent characteristics to the membranes. As a result, the single-component SiPU WBNM exhibits superior waterproofness and breathability, with a hydrostatic pressure of 52 kPa and a water vapor transmission rate (WVTR) of 5798 g m−2d−1. Moreover, the optimized SiPU-14 WBNM demonstrates outstanding mechanical properties, including a tensile strength of 6.15 MPa and an elongation at break of 98.80%. These findings indicate that the single-component SiPU-14 WBNMs not only achieve excellent waterproof and breathable performance but also possess robust mechanical strength, thereby enhancing the comfort and expanding the potential applications of protective textiles, such as outdoor apparel and car seats.
研究领域:
材料科学
·
高分子科学
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纳米技术
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纺织工程
·
环境友好材料
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Tianci Ma,Jinglei Xing,Lei Yang,Long Wang,Xingzhong Fang,Guofei Chen
As is known to all, it is an effective strategy to achieve transparent aromatic polyimides by introduction of fluorine-containing monomer. However, due to the prohibition of perfluoroalkyl and polyfluoroalkyl substances (PFAS), fluorine-free polyimides have attracted more and more attention. In order to investigate the structure-properties relationship of fluorine-free transparent polyimides, a new diamine monomer, 2′,3,3'',5′-tetramethyl-[1,1′:4′,1''-terphenyl]-4,4''-diamine (3TMTD) containing methyl group and terphenyl structure, was successfully synthesized, and a series of highly heat-resistant polyimides were synthesized by 3,3′,4,4′-diphenylsulfone tetracarboxylic acid anhydride (DSDA) with 2,2′-bis(methyl)-4,4′-benzidine (2,2′-DMBZ), 3,3′-bis(methyl)-4,4′-benzidine (3,3′-DMBZ), 3TMTD, 9,9-bis(4-aminophenyl)fluorene (FDA) and 9,9-bis(3-methyl-4-aminophenyl)fluorene (MFDA). And the polyimide containing fluorine element derived from DSDA and 2,2′-bis(trifluoromethyl)-4,4′-benzidine (TFDB) was also prepared for comparison. The effects of different methyl substitution positions and numbers, as well as fluorine-containing diamine and fluorine-free diamines, on the properties were well studied. The resulting polyimides exhibited high T g s of 373–426 °C, transmittances at 450 nm of 66–87 %, and tensile moduli of 2.8–4.0 GPa. Among them, PI-3 derived from DSDA and 3,3′-DMBZ showed the highest T g of 426 °C, while PI-4 derived from DSDA and 3TMTD dispalyed the best comprehensive performance with T g of 405 °C, transmittance of 80 % at 450 nm, tensile strength of 167.6 MPa and tensile modulus of 4.0 GPa.
研究领域:
高分子科学
·
材料工程
·
有机合成
·
光学材料
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高性能聚合物
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Chi Zhang,Shuaixiao Gao,Ye Wang,Xin Zhang,Hongqiang Chu,Huajie Huang,Fanrun Huang,Hainan Wu,Xinyan Xiong
Hydraulic concrete structures, frequently exposed to water environments, are highly susceptible to surface contamination by inorganic solid particles, organic chemical pollutants, and microorganisms like algae. In response, a novel metal-free fluorine-free coating was developed by combining red phosphorus/hydrothermal carbonization carbon (RP/HTCC) and polydimethylsiloxane (PDMS) with photocatalytic activity and superhydrophobicity to enable superior self-cleaning for hydraulic concrete. The proper integration of HTCC into RP (RP/HTCC-2) introduced a micro-nanostructured surface, improved light absorption, optimized band energy alignment, and enhanced photogenerated charge separation and migration. Correspondingly, the RP/HTCC-2@PDMS coating exhibited good self-cleaning for organic pollutant degradation on concrete surfaces, achieving 97.6 % for Rhodamine B (RhB) and 82.5 % for tetracycline hydrochloride (TCH) in water within 4-h visible light irradiation. Meanwhile, it showed remarkable superhydrophobicity, with a high water contact angle (WCA) of 157 ± 0.5° and a low water sliding angle (WSA) of 6 ± 0.5°, driving efficient self-cleaning against powder dusts. Besides, RP/HTCC-2@PDMS demonstrated robust durability against high-intensity long-term UV exposure and water-jet impact. Furthermore, the synergistic effect of photocatalytic activity and superhydrophobicity were further evident in the coating’s algal antifouling and inhibition. After 12-h visible light irradiation, the RP/HTCC-2@PDMS coating achieved a 69.8 % reduction in Microcystis aeruginosa in water. Detailed analysis of the inhibition mechanism revealed significant changes in superoxide dismutase (SOD) activity, catalase (CAT) activity, malondialdehyde (MDA) content, phycobiliprotein (PB) content, and algae organic matters (AOM). Collectively, these findings are believed to provide valuable insights on the development of green sustainable self-cleaning coating and the advanced synergistic mechanisms driving their effective and robust self-cleaning.
研究领域:
材料科学
·
环境科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Li Zhang,Wanlin Wang,Lei Zhang,Jie Zeng,Xu Gao
The dissolution mechanism of Al 2 O 3 inclusions in molten slags was explored by in-situ single hot thermocouple technique combined with X-ray photoelectron spectroscopy. Result shows that it takes 2940 s to completely dissolve Al 2 O 3 inclusions in the molten F-bearing mold flux, which is mainly controlled by boundary layer diffusion. Because the connected [AlO 6 ] octahedra in the Al 2 O 3 inclusion is gradually destroyed by the O 2− ions in the melt. By comparison, the CaO–SiO 2 –B 2 O 3 based F-free mold flux only takes 840 s to completely dissolve Al 2 O 3 inclusions. Because the [AlO 6 ] octahedra is destroyed and further transformed to [AlO 4 ] tetrahedra and produce O 2− ions, which greatly facilitates the dissociation of the Al 2 O 3 particle. However, the formed [AlO 4 ] tetrahedra will promote the precipitation of the dense 2CaO·SiO 2 ·Al 2 O 3 crystals, which tightly encases the Al 2 O 3 particle and causes significant drop in the dissolution rate. Thus, the dissolution rate is controlled by chemical reaction and then by boundary layer diffusion.
研究领域:
冶金学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）