FIRE SAFETY JOURNAL
·
2023
·
IF 3.1
Yunpeng Yang,Xujuan Wu,Jiaqing Zhang,Fengju Shang,Fei Xiao,Kaiyuan Li,Xuanya Liu
To explore the effect of nanoparticles on the foam performances of mixed surfactant solution, nano-SiO 2 particles (NPs) were added to Gemini short-chain fluorocarbon (Gemini) and hydrocarbon (LAMC) surfactants to prepare the mixed dispersion of nanoparticles and surfactants. The surface activity, dynamic viscosity, electrical conductivity, foamability, and foam stability of mixed dispersions with different concentrations of NPs were studied. The results showed that with increasing NPs concentration, the electrical conductivity and foamability gradually decreased, whereas the surface activity and dynamic viscosity increased slightly. The effect of NPs on the foam stability depends on their filling and blocking mechanisms in the plateau boundaries formed by the liquid films. When the NPs concentration is lower than 1 %, adding NPs reduces the foam's electrostatic energy, while the NP network structure cannot be formed in the plateau boundary. Consequently, the foam drainage and coarsening are accelerated, resulting in a decrease in foam stability of up to 142.4 %. When the NPs concentration is higher than 1 %, many NPs form the NP network, which fills and blocks the plateau boundary. The blockage restrains the foam drainage and coarsening, thus increasing foam stability up to 64.2 % in the current set of experiments.
研究领域:
化学工程
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材料科学
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界面科学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 17
·48617
·
IF 2.188
Bing Yang,Yu Zhou,Hongxiang Chen,Song Zhang,Jingyi Liu
In order to improve the dispersity and stability of nano-SiO 2 aqueous system with high solid content, acrylic acid/allyloxy polyethylene glycol copolymer dispersants with methoxysilicon end groups (KH590-AA x -APEG y ) were synthesized by photopolymerization. After adding KH590-AA x -APEG y into the nano-SiO 2 aqueous system, the viscosity, the curing time, the particle size, and the zeta potential of these systems were respectively measured. The results showed that introducing polyethylene glycol chain into the dispersant was beneficial to better exerting its electrostatic repulsion and steric hindrance effects and further improving the dispersibility of the nano-SiO 2 aqueous system. Moreover, the dispersion stability of SiO 2 nanoparticles in water was closely related to the composition, the molecular weight, and the addition amount of KH590-AA x -APEG y and the solid content. When the molecular weight of KH590-AA x -APEG y was 3200 g mol −1 and its addition amount was 0.1 wt %, the nano-SiO 2 aqueous system with 20 wt % solid content showed the best dispersity and stability. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48617.
研究领域:
材料科学
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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
Shaoqian Qin,Zhiwei Guo,Zumin Wu,Huabin Yin,Haofan Hu,Chengqing Yuan
The wear and vibration challenges of water-lubricated polymer components in mechanical systems remain critical. In this study, a polyurethane composite reinforced with modified nano-SiO2 and carnauba wax via casting (PUCW-SiO2) was developed, and its properties were explored. With merely 0.5% additive content of modified SiO2, the optimized composite of PUCW-0.5%SiO2 exhibited a low water swelling rate (0.157% after 7 days), enhanced mechanical properties (compressive elastic modulus is 410.39 MPa and compressive strength is 89.12 MPa), reduced wear loss (0.01 g in water), effective vibration damping (vibration acceleration signal is reduced to −4–4 m/s2 in a stable wear stage in a pure water environment), and sand-water environmental tolerance (average friction coefficient is 0.351, average wear loss is 0.0253 g). The improvements stem from modified SiO2 reinforcing the polyurethane matrix and synergizing with carnauba wax, facilitating the formation of a hydrophobic surface and continuous lubricating film that collectively mitigate wear and vibration.
研究领域:
材料科学
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聚合物复合材料
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表面工程
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机械工程
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水下技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Building Engineering
·
2025
·
IF 7.4
Wenxiu Qiao,Huina Li,Shuzhen Zheng,Hong Zhou,Yinwen Li,Shoufang Xu,Dengxue Ma,Jianfeng Ma
Inorganic nanomaterials are widely used in improving the mechanical strength of cement-based materials. However, when used in cement-based materials, inorganic nanomaterials are not only easy to agglomerate, but also often leads to the problem of significant decrease in flexural strength. In this paper, a novel organic-inorganic hybrid strategy is adopted by grafting α-lipoic acid, polyether amine, and nano-SiO 2 to synthesize a new type of polymeric nanohybrid material PTNS. The new PNTS exhibits multiple structural characteristics, including dynamic chemical S-S bonds, polycarboxylate frameworks, and steric hindrance effects derived from polyether amines. By adding PTNS to the cement paste, the agglomeration of nano-SiO 2 in cement-based materials can be effectively avoided. The mechanical strength test results show that polymeric nanohybrid material PTNS with dynamic chemical bond can achieve the synergistic improvement of the compressive strength and flexural strength of cement paste. The flexural strength of cement paste mixed with 2.0 wt‰ PTNS-2 increased by 5.3 %, 13.0 % and 9.3 % compared with the control sample after curing for 1, 7 and 28 days, respectively; The compressive strength increased by 18.6 %, 1.5 % and 6.2 % respectively. Furthermore, X-ray diffraction, scanning electron microscopy and cement hydration tests, which revealed the mechanism of mechanical properties enhancement of the slow-release polythioctic acid grafted nano-SiO 2 hybrid material PNTS.
研究领域:
材料科学
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土木工程
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纳米材料
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水泥水化
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聚合物杂化复合材料
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 18
·52958-52968
·
IF 5.8
Yuan Zhengqiu,Wu Yangfeng,Zeng Jianxian,Li Xiaoyan,Zang Kairong,Zhou Hu
In this study, hydrophobic polymer composite films based on polyurethane (PU) were prepared for oil-water separation. Hydrophilic fumed silica (nano-SiO 2 ) was introduced as reinforcing filler, and silane coupling agent (KH550) was used to crosslink PU with nano-SiO 2 in situ for enhancing the nano-SiO 2 dispersion in the films. The microscopic morphology, crystalline structure, and hydrophobic properties of the films were characterized by using scanning electron microscopy, X-ray diffraction, FTIR spectroscopy, water contact angle, and water absorption tests. The results showed that the hydrophobicity of the nano-SiO 2 /PU composite films increased with the addition of nano-SiO 2 . KH550 not only significantly promoted the crosslink action between PU and nano-SiO 2 but also enhanced the dispersion of nano-SiO 2 in the composite films. Moreover, the pore structure of the prepared films was changed with the addition of nano-SiO 2 and KH550, which greatly improved the hydrophobicity. The test results for oil-water separation performance showed that the prepared composite films can efficiently separate the oil from oil-water mixtures with good repeatability.
研究领域:
材料科学
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化学工程
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2024
·
IF 5.3
Zhijie Jing,Peng Xu,Ling Wang,Rou Liang,Chi Pang
In this work, ultrasonic-assisted laser cladding technology was employed to fabricate shape memory alloy (SMA) coatings composed of Fe-Mn-Si-Cr-Ni on the surface of 304 stainless steel. Both experimental and simulated results unequivocally demonstrate a substantial improvement in both microhardness and wear resistance of the metal surface. Subsequently, a superhydrophobic coating with an “armor-like” structure was comprehensively prepared by integrating femtosecond laser (FSL) and nano SiO 2 spray-coating techniques. The creation of this microstructure on the coating surface efficiently facilitated the high-efficiency embedding of nano SiO 2 particles. Notably, the modified SMA coating exhibited stable superhydrophobic properties and exceptional corrosion resistance. This research not only provides novel approaches and methods for the preparation and modification of Fe-based memory alloy coatings but also highlights potential applications in the corrosion-resistant field. The work offers valuable insights for researchers in the field of materials science, emphasizing the synergistic effects of ultrasound-assisted laser cladding technology, femtosecond laser, and nano SiO 2 spraying techniques. It provides robust support for the development of new functional coatings.
研究领域:
材料科学
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表面工程
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腐蚀科学
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激光技术
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Xu Li,Chunsheng Pu,Xin Chen
Foam flooding serves as one of widely-used enhanced oil recovery (EOR) techniques for developing oil and gas resources. However, the foam is a thermodynamically unstable system, limiting its EOR performance. Hence, this study aims to provide a novel strategy to stabilize foam through the combination of nanoparticle and thixotropic polymer and tries to reveal the foam-stabilizing mechanism. Firstly, a novel water-soluble thixotropic polymer (WTP) was developed, which is able to thicken solution under low shear rates and become thin under high shear rates. Such thixotropic behavior helps to stabilize foams and has little effects on the stir-foaming process. Then the hydrophobic nano-SiO 2 particles was modified by sodium dodecyl benzene sulfonate (SDBS) with the assistance of ultrasonic treatment. Coupled modified nano-SiO 2 and WTP, this study develops a novel foam system with a high foaming volume and a long half-life time. This foam system is suitable for the high-temperature and high-salinity reservoir condition and can effectively enhance the oil recovery through foam flooding. The microscopic observations show that the foam system consists of fine, round and uniform bubbles, which may slow down the film drainage and restrain the gas diffusion. At the same time, the modified nano-SiO 2 particles generate a “solid shell” on the bubble surface and improve the elasticity of foam film; the WTP forms molecular spatial networks in solution and mitigates the nanoparticle agglomeration. As a result, the synergistic effects of nano-SiO 2 and WTP can improve the stability of foam significantly.
研究领域:
石油工程
·
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）