CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Chao Peng,Feiyu Yang,Jing Dai,Ni Zhao,Yunfei Ning,Dongjin Yang,Sijia Liu,Ruihua Ji,Huan Liang
In cold regions, road surface icing poses a significant threat to traffic safety, leading to increased accident rates and considerable socioeconomic losses. Commonly used de-icing strategies include mechanical removal and salt spreading. Mechanical methods require substantial investment in equipment and maintenance, while salt-based approaches may have negative environmental impacts. In this study, a microwave-responsive, self-healing asphalt coating (SPMA) was developed by blending self-healing polyurethane (SP) with hydroxyl-functionalized multi-walled carbon nanotubes (MWCNT-OH) at a mass ratio of 30:1, and incorporating the composite into matrix asphalt. Under microwave irradiation, SPMA with 5 wt% SP/MWCNT composite exhibited a maximum surface temperature of 57.0 °C after 300 s, with an average temperature of 55.2 °C, indicating improved microwave heating efficiency and reduced thermal gradients. The de-icing rate of SPMA remained consistently high throughout the microwave heating test, outperforming both matrix asphalt and MWCNT-blended matrix asphalt (MA) specimens. After knife scratching, surface scratch on the specimens were nearly fully repaired within 20 h at 25 °C, indicating reliable self-healing performance due to reversible disulfide bonds. After 500 rutting abrasion cycles, the SPMA maintained both thermal responsiveness and structural integrity. The durability and skid resistance properties have been further substantiated through the 100 cycles of vehicular loading. These results suggest that SPMA holds promise for long-term de-icing applications on cold-region pavement.
研究领域:
土木工程
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材料科学
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交通工程
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高分子科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Yuqi Sun,Yingshi Tan,Shengnan Li,Tao Yang,Zhimin Ao,Jin Jiang,Juan Li
Freeze-accelerated reactions mainly arise from the freeze-concentration effect, where solutes are enriched in unfrozen liquid channels between ice crystals. While chlorine (HOCl) is more abundant than iodine and bromine in environments, its reactivity under freezing conditions remains largely unexplored. This study investigates the degradation of carbamazepine (CBZ) by HOCl in ice. Under pH 6.5 at −25 ℃, approximately 90 % of CBZ was degraded within 10 min, whereas negligible degradation occurred at room temperature, attributable to increased HOCl concentration in the freeze-concentrated solution. The roles of reactant concentration, pH, freeze-thaw cycling, temperature, and coexisting substances were systematically evaluated. Humic acid and nitrite inhibited CBZ degradation by scavenging HOCl, while chloride enhanced it via Cl 2 formation. Fourteen degradation products were identified with pathways involving deamidation, hydroxylation, decarboxylation, etc. Ecological Structure Activity Relationships (ECOSAR)-based toxicity predictions revealed that while some products were less toxic than CBZ, others exhibited comparable or higher chronic toxicity. This study establishes a freeze-induced oxidative degradation pathway for organic micropollutants by HOCl, highlighting its environmental relevance in cold regions such as frozen water infrastructure, atmospheric droplets, and ice-containing systems with residual chlorine. The findings underscore the importance of evaluating both degradation efficiency and by-product toxicity under freeze-induced conditions.
研究领域:
环境化学
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环境科学
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化学工程
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毒理学
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水处理
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物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Foods
·
2024
·Vol. 13
·期 11
·1704
·
IF 4.7
Lei Zhu,Chuan Zhan,Xinchu Yu,Xixi Hu,Sibo Gao,Yanqing Zang,Di Yao,Changyuan Wang,Jingyu Xu
To thoroughly understand the profile of phenolic phytochemicals in kidney bean seeds cultivated in a cold region, the extractions, contents, antioxidant activities, compositions of free and bound phenols in the seed coat and cotyledon, and also relevant color attributes, were investigated. The results indicated that ultrasound-assisted extraction was an efficient method for free phenols. The bound phenols in seed coat and cotyledon were released more efficiently by alkali-acid and acid-alkali sequential hydrolysis, respectively. Under the optimized extractions, total phenols (TPC), flavonoids (TFC), and anthocyanins (TAC) ranged in 7.81–32.89 mg GAE/g dw, 3.23–15.65 mg RE/g dw, and 0–0.21 mg CE/g dw in the whole seeds of the five common kidney beans. There was a big difference in phenolic distribution between red and white seeds. From whole seed, the phenols in the four red cultivars mainly existed in free state (78.84%) and seed coat (71.56%), while the phenols in the white ‘Sark’ divided equally between free (51.18%) and bound (48.82%) states and consisted chiefly in cotyledon (81.58%). The correlation analyses showed that the antioxidant activities were significantly and positively correlated with TPC and TFC. The phenolic attributes were closely associated with the color of the seed coat. Red seeds had higher total contents of phenols than white seeds. TAC had a positively significant correlation with redness. Brightness and yellowness showed a negatively significant correlation with TPC, TFC, and antioxidant capacities, which were necessarily linked with redness degree and spot in red seeds. The spotted red ‘Yikeshu’ with the most outstanding performance on phenolic attributes was selected to analyze phenolic compounds with UHPLC-QE-MS. Among the 85 identified phenolics, 2 phenolic acids and 10 flavonoids were dominant. The characteristic phenolics in free and bound states were screened in both seed coat and cotyledon, respectively. The available information on the phenolic profile may expand the utilization of kidney beans as a nutritional ingredient in the food industry.
研究领域:
食品科学
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植物化学
·
营养学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-10
·
IF 14.7
Wang Shuaihua,Li Yuchen,Yu Mao,Li Qikai,Li Huan,Wang Yupeng,Zhang Jiajia,Zhu Kang,Liu Weishu
Ionic thermoelectric (i-TE) liquid cells offer an environmentally friendly, cost effective, and easy-operation route to low-grade heat recovery. However, the lowest temperature is limited by the freezing temperature of the aqueous electrolyte. Applying a eutectic solvent strategy, we fabricate a high-performance cryo-temperature i-TE liquid cell. Formamide is used as a chaotic organic solvent that destroys the hydrogen bond network between water molecules, forming a deep eutectic solvent that enables the cell to operate near cryo temperatures (down to –35 °C). After synergistic optimization of the electrode and cell structure, the as-fabricated liquid i-TE cell with cold (–35 °C) and hot (70 °C) ends achieve a high power density (17.5 W m −2 ) and a large two-hour energy density (27 kJ m −2 ). In a prototype 25-cell module, the open-circuit voltage and short-circuit current are 6.9 V and 68 mA, respectively, and the maximum power is 131 mW. The anti-freezing ability and high output performance of the as-fabricated i-TE liquid cell system are requisites for applications in frigid regions.
研究领域:
热电学
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材料科学
·
能源转换
✓ 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）