Materials
·
2019
·Vol. 12
·期 24
·4217
·
IF 2.972
Dong Xiang,Liangping Shen,Hanbin Wang
Al2O3/AlN–mineral oil nanofluids were prepared by dispersing commercially available Al2O3and AlN nanoparticles into mineral oil. SEM measurements showed that the average diameter of the Al2O3and AlN nanoparticles was about 55 and 50 nm, respectively. The experiments showed that the thermal conductivity systematically improved as the Al2O3and AlN nanoparticles were introduced into the mineral oil. The thermal conductivity of the mineral oil-based nanofluids increased by 18% with a 1% volume fraction of Al2O3and increased by 7% with a 0.5% volume fraction of AlN. The experimental data were compared with the values that were predicted by four typical thermal conductivity models, and a large disparity was disclosed between the models and the experimental data. After considering the thermal dynamic factors in the Al2O3/AlN–mineral oil nanofluids, a universal model is proposed that agrees well with the variation of thermal conductivity of the nanofluids.Keywords:oil-based nanofluids;thermal conductivity;theoretical models
研究领域:
材料科学
·
热力学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Building Engineering
·
2025
·
IF 7.4
Rongfeng Gao,Jiaxi Mao,Shengqian Ruan,Yilu Qiu,Shenhao Ye,Shikun Chen,Yi Liu,Dongming Yan
Eco-friendly geopolymers have demonstrated highly effective in immobilising organic liquid wastes, even outperforming Portland cement-based materials. To evaluate the feasibility of reusing liquid waste-containing geopolymers, this study systematically investigated the effects of immobilising three categories of organic liquids, i.e., vegetable oil, mineral oil, and organosilicon liquids, on the strength, wettability, water absorption, multi-scale pore structure, and chemical composition of metakaolin-based geopolymers (MKGs). Results indicate that mixing 18 % vegetable oil has minimal impact on the early-age (3 and 7 d) compressive strength but reduces long-term (28 d) strength by 29.2−34.9 %. Vegetable oil generally exists as small spherical droplets (10−50 μm) within the MKG matrix, acting as hydrophobic fillers that reduce the water absorption rate by 78.0−83.2 %. In contrast, mineral oil with low dosages of <4 % enhances the 28-d compressive strength by up to 20.4 %. Mineral oil tends to aggregate into larger droplets (20–100 μm) due to poor dispersion. Organosilicon liquids markedly improve hydrophobicity of MKG, with water transport inhibition varying based on the functional groups of organosilicons and the microstructure of MKG matrix. This work reveals the effects and underlying mechanisms of various organic liquids on the reaction and properties of MKG, providing guidance for assessing their engineering applicability, durability, and functionality, and promoting the full utilisation of available resources.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2025
·
IF 16
Di Tan,Bo Zhu,Kangjian Xiao,Lijun Li,Zhekun Shi,Quan Liu,Stanislav Gorb,Huajian Gao,Jonathan T. Pham,Ze Liu,Longjian Xue
The nanocapillary not only contributes to the wet adhesion generated from microscale setae on the feet of many insects, such as beetles and flies, but also plays a critical role in many different fields of science and engineering like nanofabrication, chemical analysis, etc. In spite of long-standing interests and efforts, the exact physical mechanisms of nanoscale capillarity remain unclear. Here, we establish a setae-mimicking artificial system composed of porous nanorod arrays (PNAs), where the dynamic process of wet adhesion can be clearly monitored and revealed, when mineral oil is dynamically transferred to the interface between the tips of PNAs and the contacting surface. The large curvature associated with the nanosize of PNA tips endows three advantages to the insect-inspired wet adhesion: (1) shortening the time required to form stable liquid bridges, (2) enhancing the adhesion strength by 6–10 times, and (3) saving at least half of the secretions after detachment. Extra Laplace pressure and line tension originated from the nanocurved liquid at the PNA tips are responsible for the faster, stronger, and liquid-saving wet adhesion. These findings not only strengthen our understanding of the dynamic capillary effects in insect adhesion but may also offer design strategies in nanoprinting, nanorobots, and self-assembly of nanodevices.
研究领域:
生物力学
·
纳米科技
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Friction
·
2019
·Vol. 8
·期 4
·695-707
·
IF 3
Jiang Feng,Sun Haoyang,Chen Lei,Lei Fan,Sun Dazhi
Inorganic nanomaterials exhibit superior friction-reduction and anti-wear properties in oils. In this study, 2D layered α-zirconium phosphate (α-ZrP) nanosheets intercalated with different amines have been synthesized to study their dispersion stabilities in lubricating oil and tribological applications. The intercalated amines should be sufficiently long and lipophilic to provide stabilization to α-ZrP nanosheets in mineral oil. The results of tribological tests illustrate that with the addition of well-dispersed nanosheets, the coefficient of friction (COF) and pin volume loss reduce by ~47% and 75%, respectively. The excellent dispersion stability enables the nanosheets to flow into the contact area at the beginning, and thereby protect the rubbing surface. A reduction in the van der Waals forces between the adjacent layers induced by the intercalated amines transforms the friction between adjacent layers from pin disk to sliding, leading to a decrease in the COF under hydrodynamic lubrication. The study provides a new method to enhance the tribological properties via tuning the dispersion stabilities of nanomaterials in oils.
研究领域:
材料科学
·
摩擦学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Research Letters
·
2017
·Vol. 12
·期 1
·1-10
·
IF 2.833
Han Xiao,Yong Huaisong,Sun Dazhi
Two-dimensional (2D) inorganic layered nanoplatelets exhibit superior lubricating properties in both solid states and oil dispersions. In this paper, we have systematically investigated the effects of surface and interlayer modifications on the tribological performance of layered α-zirconium phosphate (ZrP) nanoplatelets in mineral oil. The pristine layered ZrP nanoplatelets were first reacted with silanes of different alkyl chains to achieve outer surface modifications, followed by intercalation with different alkyl amines to alter the interlayer spacing. Friction and anti-wear studies on ZrP nanoplatelets with various modifications in mineral oils suggest that a longer alkyl chain on the outer surfaces along with a small increase in interlayer spacing would lead to a better tribological behavior especially under a relatively heavy load condition. Our results illustrate the ability of tuning the tribological properties of 2D layered nanoplatelets in oils by varying their surface and interlayer functionalities and would be helpful for understanding the underlying tribological mechanisms of nanolubricating oils containing 2D layered nanoplatelets.
ᅟ
研究领域:
材料科学
·
纳米科技
·
表面工程
·
润滑技术
·
tribology
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 2
·1-7
·
IF 6.408
Luo Fang,Zhang Yating,Zu Yexin,Li Shiqing,Chen Yiting,Chen Zhonghui,Huang Da,Qiu Bin,Lin Zhenyu
A good water-soluble and stable nanocomposite has been facilely prepared by the encapsulation of CsPbBr 3 QDs via cetyltrimethylammonium bromide and mineral oil through sonication, namely CsPbBr 3 @CMO nanocomposite. Such method is very quick and simple without complicated instruments and strict conditions. The results reveal that the synthesized CsPbBr 3 @CMO nanocomposite is spherical with uniform size and shows remarkably good solubility and stability in water. Specifically, the fluorescent intensity of CsPbBr 3 @CMO nanocomposite in water is decreased by 0.76% after 3 h; this result is comparable with those in earlier studies, and the good stability in water might be owned to the hydrophobic core of the CsPbBr 3 @CMO nanocomposite. The prepared CsPbBr 3 @CMO nanocomposite has been applied as a sensitive fluorescent probe for monitoring hydrogen sulfide (H 2 S), and the fluorescence intensity (~ 524 nm) has a linear relationship with the concentration of H 2 S in the range 0.15–105 µM with a detection limit of 53 nM, demonstrating application for monitoring H 2 S in rat brain coupled with microdialysis apparatus with satisfied results. The present study not only provides a simple but sensitive approach for the detection of H 2 S in living body, but also paves the way for expanding the application of CsPbBr 3 QDs to aqueous medium. Graphical abstract
研究领域:
纳米技术
·
材料科学
·
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2024
·
IF 5.7
Lin Zhu,Mingming Zhang,Boyan Gao,Hong Zhang,Hai Zhang,Yaqiong Zhang,Liangli Lucy Yu
In this work, the paraffin oil was first molecularly distilled into two mineral oil saturated hydrocarbons (MOSH) subfractions with their main carbon number range of C20–30 (84.58%) and C30–50 (89.65%), which were determined using a liquid chromatography–gas chromatography–flame ionization detector (LC-GC-FID) technique. Then, both female and male Fischer 344 (F344) rats were fed with the diets containing one of these two MOSH subfractions at the low (1.5 g/kg) or high dose (15 g/kg) for 6 months. It was found that the exposure of MOSH C20–30 subfraction could result in a significant increase of spleen weight index (4.64 ± 0.18 mg/g for female and 3.79 ± 0.31 mg/g for male rats) (P < 0.05), and irregular shape of white medulla, and the macrophage infiltration in mesenteric lymph node for both female and male rats, especially for the 15 g/kg MOSH C20–30-fed rats. Meanwhile, both MOSH C20–30 and C30–50 subfraction promoted inflammation and oxidative stress and had a negative effect on the immune function in both female and male rats. The metabolomics results further supported these observations, and indicated the down-regulation of cysteine and methionine metabolism, and glutathione metabolism pathway in female and male rats, respectively.
研究领域:
毒理学
·
环境健康科学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER BULLETIN
·
2018
·Vol. 76
·期 4
·1807-1824
·
IF 1.589
Ji Chunda,Chen Xiao,Li Fengfu,Yun Zhi
Double methyl oleate (MO) capping agent (MO-MM-MO) was prepared by hydrosilylation, from MO and tetramethyldisiloxane (HMMH). The structure was characterized by IR spectrum. By investigating the effects of different catalysts and reaction conditions on the hydrosilylation conversion, the H 2 PtCl 6 ·6H 2 O/isopropanol solutions was selected as catalyst, and the optimal reaction conditions were determined. The double MO-terminated polysiloxane (MOM-D n -MMO) with different degree of polymerization (DP) was prepared via octamethylcyclotetrasiloxane (D 4 ) ring opening polymerization, with MO-MM-MO terminated. The effects of DP on the performance of MOM-D n -MMO were studied. With the increase in DP, the viscosity–temperature performance of product gradually increases, and it remained basically unchanged, when the DP was 60 or more. For the lubrication performance, as the DP increased, the product lubrication performance improved gradually, and compared with polydimethylsiloxane (M-D n -M), the lubrication performance of MOM-D n -MMO was also more excellent. The products with large DP had good thermal stability, also. In addition, the effects of product on the mineral oil performance were also investigated. The MOM-D 40 -MMO was good compatible with mineral oil, and the lubrication performance of mineral oil with MOM-D 40 -MMO was also improved, due to the presence of MO.
研究领域:
材料科学
·
化学工程
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2021
·
IF 9.028
Dejun Feng,Yuanmiaoliang Chen,Zhangxin Wang,Shihong Lin
Although membrane distillation (MD) has been identified as a promising technology to treat hypersaline wastewaters, its practical applications face two prominent challenges: membrane wetting and fouling. Herein, we report a facile and scalable approach for fabricating a Janus MD membrane comprising a dense polyvinyl alcohol (PVA) surface layer and a hydrophobic polyvinylidene fluoride (PVDF) membrane substrate. By testing the Janus membrane in direct contact MD experiments using feeds containing a sodium dodecyl sulfate (SDS) surfactant or/and mineral oil, we demonstrated that the dense Janus membrane can simultaneously resist wetting and fouling. This method represents the simplest approach to date for fabricating MD membranes with simultaneous wetting and fouling resistance. Importantly, we also unveil the mechanism of wetting resistance by measuring the breakthrough pressure and surfactant permeation (through the PVA layer) and found that wetting resistance imparted by a dense hydrophilic layer is attributable to capillary pressure. This new insight will potentially change the paradigm of fabricating wetting-resistant membranes and enable robust applications of MD and other membrane contactor processes facing challenges of pore wetting or/and membrane fouling.
研究领域:
化学工程
·
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xinyu Cao,Xu Guo,Tianyuan Xiao,Wenchao Jia,Xiaodi Liu,Changgeng Li,He Zhang,Pedram Fatehi,Haiqiang Shi
Aerogels are great adsorbents for oil decontamination due to their high porosity and specific surface area. However, the current oil-adsorbing materials for preparing such aerogels are expensive and environmentally unfriendly. This study successfully prepared three superhydrophbic biomass-based aerogels (SBAs) using treating biomass in a green LiBr·3H 2 O system and hydrophobic modification with hexadecyltrimethoxysilane (HDTMS). The time and temperature of hydrophobic modification reaction and biomass components are optimized by orthogonal experiment and investigated by the response surface methodology to improve water contact angle (WCA). The prepared SBAs have low weight, specific surface area (85.12–136.64 m 2 /g), and hierarchical porous structure. The WCA of the SBAs was 157°±5°, exhibiting excellent superhydrophobicity of the SBAs. The high WCA is attributed to the successful grafting of Si in the forms of Si–O and C–Si onto the aerogel, as indicated by FTIR and XPS. Oil adsorption experiments have shown that SBAs had outstanding sorption capacity in the range of 8–37.8 g/g of oil/SBAs. Furthermore, the SBAs exhibited excellent reusability after ten cycles of use. These results demonstrate that the SBAs are practically viable and highly efficient biosorbents for treating oil spills and organic pollutants.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
WATER RESEARCH
·
2024
·
IF 11.4
Chao Wang,Yangbo Qiu,Guangzhe Wang,Long-Fei Ren,Jiahui Shao
Dense Janus membranes (JMs) are potential candidates in hypersaline wastewater treatments for membrane distillation (MD). However, dense surface layers generally add obvious membrane mass transfer resistance, limiting its practical application. In this study, a novel dense JM was facilely developed by controlled interfacial polymerization utilizing a phosphonium functional monomer (THPC) on hydrophilic polyvinylidene fluoride (PVDF) substrate. MD desalination performance results showed that the optimized THPC/PVDF JM surprisingly achieved a flux even 21.3% higher than that of its substrate and exhibited robust stability to surfactants, oil, and gypsum. Importantly, potential mechanism of remarkable flux enhancement of dense JMs was revealed. Raman and DSC analyses showed that THPC/PVDF JM with elevated intermediate water content had minimal enthalpy for water evaporation, thus facilitating water vaporization. Dynamic water contact angle measurements, advanced microstructural characterization by positron annihilation spectroscopy and water permeability experiments etc. showed that THPC/PVDF JM with high hydrophilicity and appropriately enlarged effective pore sizes provided strong water-absorption capacity and water permeability, contributing to rapid water replenishment. Both synergistically contributed to an incredible increase in membrane flux. Meanwhile, the dense surface layer, featured by its strong hydrophilicity and abundant hydroxyl groups, effectively prevented complex contaminants from intruding hydrophobic substrate and discouraged oil/gypsum adhesion, ensuring stable MD operation. This study shall provide useful insights and strategies to design high-flux dense JMs with minimal membrane failure propensity, highlighting its great potential for efficient hypersaline wastewater treatments.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Bio
·
2025
·
IF 10.2
Chenhui Chen,Yuqi Xie,Qinfeiyang Zhang,Junyan Cao,Jixing Lin,Xian Tong,Yihao Wu,Li Zhu,Peng Gao,Jianfeng Ma
Bacteria are pivotal in the etiology of dental caries, underscoring the critical importance of effective plaque control in mitigating dental tissue diseases. Superhydrophobic materials, with their exceptional properties of non-wettability, antibacterial activity, and self-cleaning capabilities, present a promising approach for caries prevention. However, their clinical application remains constrained by challenges in achieving stable adhesion to tooth surfaces. Inspired by the natural adhesion mechanisms of acquired salivary pellicle (ASP), we synthesized Janus amphiphilic superhydrophobic nanoparticles comprising 1H,1H,2H,2H-perfluorooctyltriethoxysilane (FOTS), nano-silica, and the enamel binding peptide DDDEEKC-Peg(2000)-COOH. These nanoparticles were engineered to form a superhydrophobic film (FOTS-SiO 2 -Peptide) on tooth surfaces. Experimental analyses revealed rapid adsorption of these nanoparticles onto enamel, with their exposed surfaces creating a durable superhydrophobic layer that remained stable under diverse thermal conditions. Topical application of FOTS-SiO 2 -Peptide significantly reduced the incidence and severity of dental caries while preserving oral microbiota diversity and avoiding adverse effects on surrounding mucosal tissues. Safety and efficacy evaluations confirmed the biocompatibility of these Janus nanoparticles, highlighting their potential as a novel biomedical solution for caries prevention.
研究领域:
牙科学
·
材料科学
·
纳米技术
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）