Journal of Materials Chemistry A
·
2025
·
IF 9.5
Lin Wang,Manman Jia,Hui Jiao,Shukang Ti,Dongmei Yue
Nitrile Butadiene Rubber (NBR) is widely used in aerospace, petroleum exploration, auto parts, and other fields because of its excellent performance. Nevertheless, NBR usually needs to be crosslinked with sulfur or peroxide, which restricts the tensile performance and recyclability of NBR. Herein, a novel strategy was developed to address these issues by introducing dynamic urea bonds into the main chain using a simple, catalyst-free one-pot method. The presence of urea bonds not only provides a large number of hydrogen bonding sites between the molecular chains but also exhibits the remarkable microphase separation properties of thermoplastic elastomers. This approach endows NBR with enhanced dynamic characteristics and significant recyclability. As a result, the as-synthesized multifunctional NBR elastomer (I–A0.5–P0.5) exhibits excellent tensile strength (19.9 MPa), toughness (93.7 MJ m−3), low glass transition temperature (−52 °C), and low compression cold resistance coefficient (0.15 at −55 °C), which are comparable to those of conventionally covalently crosslinked NBR. Importantly, the elastomer can retain its mechanical robustness, chemical structure, and thermal stability after multiple rounds of recycling (after five times of recycling, with a recovery of more than 81%). To broaden the application of NBR products, I–A0.5–P0.5 was crosslinked with sulfur, and its performance was compared with NBR vulcanizates of different acrylonitrile contents. It shows excellent oil resistance and low temperature resistance. Surprisingly, it can also possess the ability to be reprocessed multiple times. This new multifunctional thermoplastic NBR elastomer is of great significance in solving the problem of difficult recycling of traditional NBR and is expected to replace traditional covalently cross-linked NBR.
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
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Yan-Fang Xiao,Xiao-Feng Liu,Feng-Ming He,Song Gu,Yu-Zhong Wang,Li Chen
To ameliorate the inherent deficiencies of epoxy resins (EP) and to achieve flame-retardant EP with comprehensive performance for versatile applications, a phosphorus-containing polyester named PEDP with rigid-flexible spacers and bis-phosphaphenanthrene pendants was designed, prepared and successfully applied to EP as polymeric flame retardant with multifunctionalities. The obtained EP-PEDP thermosets did not show phase separation to achieve a high dispersion of PEDP and enhanced interaction between two components, which effectively improved the mechanical properties of the thermosets. EP-PEDP displayed excellent toughness, with impact toughness, fracture toughness K IC and G IC reaching 30.9 kJ·m −2 , 1.27 MPa·m 1/2 and 0.67 kJ·m −2 , respectively, showing 166.4 %, 28.3 %, and 59.5 % greater than neat EP; yet tensile and flexural strength also increased rather than sacrificed. The combined flame-retardant action of PEDP in gaseous and condensed phases effectively improved the self-extinguishment and greatly suppressed the release of smoke and heat during burning to achieve high fire safety of EP-PEDP. In addition, EP-PEDP also possessed high glass transition temperature, satisfactory thermal stability, transparency with UV shielding capacity, as well as good dielectric and thermomechanical properties. The design and synthesis of this multifunctional phosphorus-containing polyester with a rigid-flexible integrated nature, which integrates mechanical enhancement, serves as a promising polymeric flame retardant for high-performance EP to meet diverse requirements.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
CARBON
·
2019
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IF 7.466
Sishi Long,Yunchao Feng,Faliang He,Shuaishuai He,Huachi Hong,Xuerui Yang,Lingling Zheng,Jian Liu,Lihui Gan,Minnan Long
Compressible and ultralight carbon aerogels are attractive due to its compressibility , elasticity and conductivity. However, it is still a great challenge to enrich the properties of carbon aerogel to meet various requirements. Herein, we report an untralight, supercompressible, fatigue resistant, superhydrophobic and fire-resistant and multifunctional CNF-GO/glucose-kaolin carbon aerogel (C-NGGK) carbon aerogel. To achieve such excellent performances, calcined GO , CNFs , glucose and kaolin are used for forming low-density and continuous wave-shape rGO layers, reinforcing the mechanical strength of carbon layers , realizing superelasticity and fatigue resistance and resulting in a superhydrophobic surface for C-NGGK, respectively. The as-prepared C-NGGK demonstrates excellent superhydrophobicity with the water contact angle (WCA) of 124.9°, and the absorption efficiency of the C-NGGK samples for different oils and organic solvents are 75–255 times their own weight. These advantages show that the C-NGGK can be an ideal candidate for oil/water separation. In addition, there is also the prospect to be used for pressure sensors , while other potential applications include three-dimensional electrode materials for supercapacitors and batteries , catalyst carriers and various wearable devices .
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
Foods
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2025
·Vol. 14
·期 11
·1851
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IF 5.1
Lin Yuan,Jianfeng Yuan,Chen Gao,Haoming Zhao,Chengye Wu,Zhong-Hua Yang
The microbial conversion of inorganic Se into bioactive organoselenium compounds represents a cutting-edge strategy for developing functional foods with enhanced nutritional value. This study introduces Lactiplantibacillus plantarum S1, a novel Se-enriched probiotic strain isolated from traditional Chinese sauerkraut, and systematically optimizes its capacity for selenite biotransformation. Critical fermentation parameters—including sodium selenite supplementation timing (2 μg/mL added at mid-log phase, 7 h post-inoculation), pH (5.0), and anaerobic cultivation duration (12 h)—were identified as key determinants of conversion efficiency. The optimized protocol achieved a 72.3% organoselenium conversion yield, producing 626.6 μg/g cellular organoselenium while maintaining probiotic viability (2.28 × 10 9 CFU/mL). Se speciation analysis demonstrated that 78.51% of intracellular Se existed in organic forms, with protein-bound Se constituting the predominant fraction (85.33%), followed by polysaccharide-associated (6.42%) and nucleic acid-linked (3.38%) species. The strain’s dual functionality as both an efficient Se bioconverter and a resilient probiotic carrier highlights its potential for nutraceutical applications. These findings not only establish a robust bioprocess for Se-enriched probiotic production but also reveal mechanistic insights into preferential Se incorporation into protein matrices. This work bridges microbial Se metabolism research with scalable functional food innovation, offering a sustainable platform for developing Se-fortified products with dual health benefits.
研究领域:
食品科学
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微生物学
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营养学
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产品关联
DOI
PubMed
高影响因子
Journal of Magnesium and Alloys
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2020
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IF 7.115
Lingjie Li,Xia Li,Jinlong Chen,Lei Liu,Jinglei Lei,Nianbing Li,Gao Liu,Fusheng Pan
The robust magnesium surfaces with multi-functions are highly desirable, and the simple and scalable methods to construct such surfaces are urgently indispensable. Herein, we conducted a one-step spraying method to facilely fabricate the robust coating with multi-functions on magnesium alloys. The as-sprayed magnesium alloys surface is superhydrophobic with a static water contact angle (WCA) of 157.0° and a roll-off angle of 6.0°. Such surface has excellent mechanical, chemical and thermal stabilities, even undergoing various physical and chemical damages, including sand impact (10 g min −1 , ≥20 min), water impact (2 impacts s −1 , ≥ 180 min), abrasion (1.00 kPa, ≥25 cycles), peeling (≥2.15 kPa), high temperature (200 °C, ≥24 h), strong acidic/salty/basic media (pH = 1∼13) and organic-solvent immersion (ethanol and n-hexane, ≥24 h), demonstrating brilliant robustness. Notably, the surface displays multi-functions of corrosion protection, anti-fouling and heat insulation, which will undoubtedly promote the much wider applications of magnesium alloys.
研究领域:
材料科学
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表面工程
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产品关联
DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Pufang Zhao,Wei Zeng,Zhiwang Yang,Yaoxia Yang,Ju Li,Jianping Shi,Na Wen,Hongtao Li,Jie Guan,Ziqiang Lei,Denglong Chen
In this study, a novel organic-inorganic hybrid flame retardant 10-(1,4-dicarboxylic acid magnesium salt)-9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DMMH) was synthesized via neutralization and addition reaction of maleic acid, magnesium hydroxide and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO), and subsequently used in an intrinsic flame retardant epoxy resin . The chemical structure and morphology of DMMH were analyzed by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). Further, the prepared DMMH was combined with ammonium polyphosphate (APP) to form an intumescent flame retardant system. The thermal stability and flame retardance were evaluated by thermogravimetric analysis (TG), UL-94 vertical burning test, limiting oxygen index (LOI) and cone calorimetry. It was observed that the addition of 1.7% DMMH and 5.3% APP led EP-7 to acquire UL-94 V-0 rating, with the limiting oxygen index of 26.0%. As compared with pure EP, the peak heat release rate, total heat release, smoke production rate and total smoke production of the sample was noted to decrease by 54.5%, 35.1%, 43.6% and 38.1%, respectively. In addition, the introduction of DMMH did not negatively impact the mechanical properties of the epoxy resin.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Environmental Chemistry
·
2018
·Vol. 15
·期 4
·205-214
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IF 2.923
Hui Yao,Nan You,Hong-Guang Cao,Li-Xia Kang,Jin-Bao Wu,Yu-Jie Zhao,Hong-Tao Fan,Yan-Li Yi
Environmental context Low availability of calcium (Ca2+) in soils is one of the major factors in Ca2+ deficiency of plants and physiological plant disorders. A device based on functionalised silica was developed for in-situ measurement of the available Ca2+ in soils. Application of the proposed device to measure available Ca2+ may help to develop and improve agricultural practices. Calcium is an ion of particular interest due to its importance in plant nutrition and soil structure. A novel device of diffusion gradients in thin-films (DGT) based on the benzo-crown ether-functionalised silica (BCES) as the binding agent and the polyethersulfone (PES) membrane as diffusive layer (BCES-DGT) was developed for in-situ sampling of available calcium (Ca2+) in freshwater and soil samples. The performance characteristics of the BCES-DGT device were assessed. The BCES was prepared using the sol-gel process and characterised by Fourier transform infrared spectroscopy, scanning electron microscopy, thermal gravimetric analysis and N2 adsorption–desorption. Results evinced that BCES was obtained successfully with a rough wrinkled surface and good specific surface area of 111.3 m2 g−1. The diffusion coefficient of Ca2+ ions in PES membrane was found to be 1.23 × 10−6 cm2 s−1 at 25 °C and was independent of pH in the range of 3–10 and ionic strength (as pNaCl) from 1 to 3. The high binding capacity of BCES binding gel for Ca2+ ions was determined to be 9822.4 ± 452.9 μg Ca2+/disk and was conducive to the deployment of long-term or high concentration. The BCES-DGT device can accurately measure the concentrations of Ca2+ over wide ranges of ionic strengths (1–3 as pNaCl) and pH (5–10). There was no significant interference on the uptake of Ca2+ by the BCES-DGT device at the tolerance limits up to 500 for Mg2+, Li+, HCO3−, H2PO4−, NO3− and SO42−, 250 for Sr2+, 2000 for K+ and 50 for fulvic acid. The results from BCES-DGT device were in excellent agreement with those measured directly using ion selective electrode in several water and soil samples. Field application in river water indicated that a good agreement was obtained between BCES-DGT value and mean grab sample measurements of Ca2+ and that the relative standard deviation of BCES-DGT measurement (4.7 %) was superior to that of grab sample measurements (13.5 %), suggesting that BCES-DGT was reliable for in-situ sampling and measurement of available Ca2+ with good accuracy and precision.
研究领域:
环境科学
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农业科学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2016
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IF 5.393
Xiaolin Zhang,Jieshu Qian,Bingcai Pan
Efficient and powerful water purifiers are in increasing need because we are facing a more and more serious problem of water pollution. Here, we demonstrate the design of versatile magnetic nanoadsorbents (M-QAC) that exhibit excellent disinfection and adsorption performances at the same time. The M-QAC is constructed by a Fe3O4 core surrounded by a polyethylenimine-derived corona. When dispersed in water, the M-QAC particles are able to interact simultaneously with multiple contaminants, including pathogens and heavy metallic cations and anions, in minutes. Subsequently, the M-QACs along with those contaminants can be easily removed and recollected by using a magnet. Meanwhile, the mechanisms of disinfection are investigated by using TEM and SEM, and the adsorption mechanisms are analyzed by XPS. In a practical application, M-QACs are applied to polluted river water 8000-fold greater in mass, producing clean water with the concentrations of all major pollutants below the drinking water standard of China. The adsorption ability of M-QAC could be regenerated for continuous use in a facile manner. With more virtues, such as low-cost fabrication and easy scaling up, the M-QAC have been shown to be a very promising multifunctional water purifier with rational design and to have great potential for real water purification applications.
研究领域:
材料科学
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环境科学
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
·
2022
·
IF 5.168
Chunyuan Wu,Haikuan Dong,Gaoshen Su,Huan Yang,Xiaorong Yu
Free radical solution polymerization method was used to preparing copolymers (FAPAM, IAPAM, and MAPAM) by copolymerizing acrylamide (AM) with functional monomers fumaric acid (FA), itaconic acid (IA) and maleic anhydride (MAH) respectively. The basic parameters of the polymer were characterized by fourier transform infrared spectrometer (FTIR), proton nuclear magnetic resonance spectroscopy ( 1 HNMR), elemental analyzer and ubbelohde viscometer . In polymer flooding , the viscosity reduction effect of Fe 2+ and S 2− in formation water is more serious than that of inert cations, and they have greater impact on oil recovery. Therefore, this paper studied the influence of functional monomers on the structure of polymers and the influence on the resistance to Fe 2+ and S 2− properties of polymers through rheometer , gel permeation chromatography (GPC) and scanning electron microscope (SEM). The results revealed that the intra-chain or interchain forces can be increased to varying degrees by introducing different functional groups into the polymer molecular chains , as a result, the copolymer had different resistance to Fe 2+ and S 2− . In addition, the carboxyl groups on MAPAM chain were the most evenly distributed, its configuration was the most regular, and its resistance to Fe 2+ was the strongest. Relatively, the carboxyl groups on IAPAM macromolecular chain were evenly distributed on both sides of the main chain, and it had the strongest ability to resist S 2− . The results of GPC and SEM further proved that the copolymers had the ability to resist Fe 2+ and S 2− .
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
Soft Matter
·
2021
·Vol. 17
·期 41
·9399-9409
·
IF 3.679
Hui Jie Zhang,Xinyi Wang,Lini Wang,Tao Lin Sun,Xugang Dang,Daniel R. King,Xiangyu You
Biopolymer-based functional hydrogels with excellent mechanical properties are desired, but their fabrication remains a challenge. Learning from the tofu-making process, we developed a freely formable hydrogel with high toughness and stiffness from the hydrogen bond-rich coacervation of tannic acid and gelatin through a simple hot-pressing process that transforms the coacervate particles into a bulk hydrogel. The mechanical properties of the obtained gelatin/tannic acid hydrogel (G/T gel) can be controlled by tuning the weight ratio of tannic acid to gelatin in the gel. The G/T gel with optimum mechanical properties possesses high Young's modulus, fracture strain, and fracture energy of ∼60 MPa, ∼10, and ∼24 kJ m−2, respectively. These properties arise from the phase-separated structure and high concentration of dynamic hydrogen bonds with widely distributed bond strengths. These dynamic hydrogen bonds also enable multifunctional properties of the gel, such as self-recovery, self-healing, rebuildability and shape memory. The combination of excellent mechanical properties, good biocompatibility, and useful functionalities into one hydrogel that comes from renewable sources demonstrates the great potential of G/T gels.
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Longchao Ma,Yihan Zhao,Tao Zhang,Tiancheng Yuan,Xinzhou Wang,Yanjun Li
The flattened bamboo board (FB) represents a promising innovation in the bamboo industry. To address the challenges of flammability and hygroscopicity, composite coatings consisting of melamine (MEL), phytic acid (PA), cerium ions (Ce 3+ ), and sodium laurate (La) are assembled on the FB surface through an in-situ impregnation strategy. The resulting MEL/PA-Ce 3+ @La FB exhibits exceptional flame retardancy. It achieves a V-0 rating in the vertical burning test (UL-94) and boasts a high limiting oxygen index (LOI) value of 38.5 %. The coated FB exhibits superhydrophobicity, evidenced by a water contact angle of 156.5°, which can be attributed to the in-situ growth of PA-Ce 3+ complexes (for constructing micro/nanoscale coarse structures) and the modification with La (for reducing surface energy).This superhydrophobic surface imparts both self-cleaning and anti-mold properties to the coated FB. Moreover, the coated FB exhibits excellent mechanical stability, withstanding 36 cycles of sandpaper abrasion and tape peeling without losing its hydrophobicity. In summary, this work provides an innovative strategy for the bamboo processing industry to produce flattened bamboo boards with combined flame retardancy, superhydrophobic and anti-mold properties. Such versatility holds significant potential to facilitate the utilization of flattened bamboo boards in the construction and decorative materials industries.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2021
·
IF 6.609
Zhen Liu,Muyao Zhu,He Yang,Dawei Zhao,Kaimeng Zhang
To improve the ability of water to wet coal in the process of coal seam water injection, different ionic liquids and surfactant compound solutions were added to water. Analyses of surface tension, reverse spontaneous imbibition, and contact angle were used to optimize the different compound solutions. The results showed that when the mixture ratio of 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIm][BF 4 ]) and sodium dodecyl sulfate (SDS) was 3:1, and the concentration of the composite solution reached 0.1 wt%, the liquid surface tension reached a minimum of 28.946 mN/m, and the contact angle between the solution and the coal sample was 41.3°, which was lower than that of any concentrations of the other composite solutions. This solution could effectively wet the coal. In addition, infrared spectroscopy showed that different concentrations of the [BMIm][BF 4 ] and SDS composite solution had different effects on the content of functional groups in coal. Further, based on the relationship between the content of the functional groups and contact angle, the relationship between the content of ring hydroxyl and OH⋯O in the hydroxyl structure and the size of the contact angle was found to be the most significant. Based on the above findings, a new type of composite wetting agent was prepared, and the wetting mechanism between coal and the wetting agent was clarified from the perspective of functional groups. The research results have important guidance and practical significance for improving the effect of increasing moisture and reducing dust in the process of coal seam water injection.
研究领域:
化学工程
·
煤炭科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）