INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Minglun Cheng,Sibo Shen,Zhiwei Zhang,Kui Niu,Ning Wang
Electroreduction of CO2 to value-added low-carbon chemicals is a promising way for carbon neutrality and CO2 utilization. It was found that the diiron complex [(μ-bdt)Fe2(CO)6] (bdt = benzene-1,2-dithiolate) has high catalytic activity for electrocatalytic CO2 reduction. To further study the effect of the S-to-S bridge on the catalytic performances of diiron complexes for electrochemical CO2 reduction, four diiron complexes 1–4 with different rigid and conjugated S-to-S bridges were either selected or designed. The electrocatalytic studies showed that under optimal conditions, 2 with a 2,3-naphthalenedithiolato bridge exhibited the lowest catalytic onset potential (Eonset = −1.75 V vs Fc+/0), while 4 with a diphenyl-1,2-vinylidene bridge displayed the highest catalytic activity (TOFmax = 295 s–1), which is 1.5 times that of [(μ-bdt)Fe2(CO)6]. The controlled potential electrolysis experiments of 4 in 0.1 M MeOH/MeCN at −2.35 V vs Fc+/0 gave a total faradaic yield close to 100%, with selectivities of 77%, 9%, and 14% for HCOOH, CO, and H2, respectively. The mechanism for CO2 reduction was studied using density functional theory, IR spectroelectrochemistry, and electrochemical methods. The results indicate that modifying the structure of the S-to-S bridge is an effective strategy to improve the catalytic performance of diiron complexes for electrocatalytic CO2 reduction.
研究领域:
化学
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Energy
·
2025
·
IF 17.1
Lixin Bai,Juan Chen,Yi Zhang,Zheng Yi,Yuansen Xie,Maowen Xu,Yuruo Qi
The intrinsic sodium storage performance of hard carbons is fundamentally governed by its structure attributes, which are primarily shaped by the precursor material. Therefore, a direct manipulation of precursors at the molecular level offers considerable flexibility in engineering hard carbon architectures. This study introduces a straightforward and effective pre-carbonization approach to modulate the molecular configuration and functional groups within celluloses, employing both oxygen-bridging and air-etching to stimulate the development of closed pores during carbonization. These closed pores not only facilitate the transport of sodium ions but also serve as active sites for sodium storage, resulting in a hard carbon with an impressive specific capacity of 421.1 mA h g −1 and a substantial low-voltage plateau capacity of 312.8 mA h g −1 . Extensive research has elucidated the formation mechanism of closed pores as well as its correlation with low-voltage plateau capacity, which will greatly forward the rational design of high-performance hard carbon anodes for next-generation sodium ion batteries.
研究领域:
材料科学
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电化学
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储能技术
✓ 已验证
产品关联
DOI
高影响因子
Biomedical Engineering Online
·
2024
·Vol. 23
·期 1
·1-10
·
IF 2.9
Xie Cuncun,Jia Xiaodong,Ding Shaoguang,Ding Xiaoli,Wang Guangke,Liu Hongjian
Objectives To explore the expression of periostin in the epithelium of cholesteatoma with different destruction degrees of the ossicular chain and its clinical value in predicting postoperative hearing recovery. Methods Retrospective analysis was conducted on the clinical data of 100 patients with middle ear cholesteatoma (the cholesteatoma group) admitted to our hospital. Another 100 patients without middle ear cholesteatoma treated in our hospital during the same period were included in the non-cholesteatoma group. Middle ear cholesteatoma patients were further divided into a normal group, a partial destruction group, and a complete destruction group based on the destruction degree of the ossicular chain (Maresh grading). After the treatment, 75 cases were considered as the effective group and 25 cases as the ineffective group. The expression of tumor necrosis factor-alpha, Interleukin 6, and periostin in the epithelium of middle ear cholesteatoma patients with different destruction degrees of the ossicular chain and different therapeutic effects were compared. The correlation between periostin and inflammatory factors was analyzed using Pearson analysis. The predictive value of tumor necrosis factor-alpha, Interleukin 6, and periostin on treatment effect was valued using the receiver operating characteristic curve. Results Patients in the cholesteatoma group had a much higher content of tumor necrosis factor-alpha, Interleukin 6, and periostin than those in the non-cholesteatoma group ( P < 0.001). The expression of tumor necrosis factor-alpha, Interleukin 6, and periostin was also largely increased with the destruction group of the ossicular chain. Patients in the ineffective group had much higher expression of tumor necrosis factor-alpha, Interleukin 6, and periostin than those in the effective group ( P < 0.001). The Pearson correlation analysis results showed that periostin was positively correlated with the content of tumor necrosis factor-alpha and interleukin 6 ( P = 0.868, 0.880, P < 0.001). The areas under the curve of individual or joint tumor necrosis factor-alpha, Interleukin 6, and periostin were 0.627, 0.793, 0.822, and 0.892, respectively. Conclusions The expressions of periostin, Interleukin 6, and tumor necrosis factor-alpha were markedly increased in the epithelium of middle ear cholesteatoma patients, which were gradually increased with the aggravation of the ossicular chain destruction. Periostin, Interleukin 6, and tumor necrosis factor-alpha could be used as important indicators to predict postoperative hearing recovery.
研究领域:
耳科学
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分子生物学
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临床医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 36
·e55920
·
IF 2.7
Yi Yang,Yin Lu,Kan Zhang
In this study, we designed and synthesized a series of norbornene-furan functionalized benzoxazine monomers ( HPAP-fa , HPAMP-fa , and HPTM-fa ) by regulating the bridge length in benzoxazine structure in order to improve the comprehensive performance of norbornene-furan functionalized benzoxazine system. This research systematically examined the impact of flexible segments on the structural information, polymerization behaviors, thermal stability, and flame retardancy of resulting polybenzoxazines. Initially, the structural characteristics of benzoxazine were confirmed through nuclear magnetic resonance, Fourier-transform infrared (FT-IR), and HR-MS. Subsequently, the polymerization mechanisms of each benzoxazine monomer were investigated utilizing differential scanning calorimeter and in situ FT-IR analyses. Finally, the thermal stability and flame-retardant properties were investigated by TGA and micro-combustion calorimetry measurements. Consequently, HPAP-fa exhibited the lowest polymerization temperature and the corresponding poly(HPAP-fa) showed very high thermal stability ( T d5 of 392°C and T d10 of 437°C) as well as excellent flame retardancy (HRC of 83.7 J g −1 K −1 ), which shows a significant improvement compared to poly(HPTM-fa) . As a result, the modulation of bridge segments within the monomer represents a viable approach towards enhancing the holistic efficacy of norbornene-furan functionalized benzoxazine systems.
研究领域:
材料科学
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2021
·
IF 6.158
Yimin Liu,Jie Ma,Lili Lian,Xiyue Wang,Hao Zhang,Wenxiu Gao,Dawei Lou
An inorganic-biopolymers hybrid flocculant (PSAC-SA) was prepared by modifying sodium alginate onto polysilicate aluminum calcium (PSAC) through coordination between SA and Ca 2+ . The preparation conditions of PSAC-SA and the flocculation parameters that influence of the turbidity and color removal efficiency were investigated and optimized. The flocculation experiments results showed that the maximum turbidity and color removal could get 97.2% and 98.4% for kaolin-humic acid suspensions, respectively. The application of PSAC-SA for Songhua River treatment indicated that it had an excellent flocculation capacity in real water samples, and its flocculation efficiency was much better than that of individual flocculants (PSAC and SA). Moreover, the flocculation mechanisms were discussed in detailed, which indicated that the bridging effect and physical entrapment of solid particles played an important role in the flocculation process.
研究领域:
环境科学
·
水处理工程
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 3.7
Guozhen Li,Shiqi Ling,Yuhui Cui,Shilong Dong,Tianyin Liu,Ting Li,Siyu Pang,Peiyong Qin
Zeolitic imidazolate framework-8 (ZIF-8) is a typical filler used to fabricate mixed matrix membranes (MMMs) on account of its attractive advantage of high selective permeability for gas separation. However, the performance is usually affected by filler aggregation due to strong interactions among fillers and weak interactions between the polymer and fillers, However, the performance is usually affected by filler aggregation due to strong interactions among fillers and weak interactions between the polymer and fillers, which will lead to a decrease of selectivity and the performance of gas separation will be strongly influenced. Herein, we modified ZIF-8 with 3-amino-1,2,4-triazole to obtain ZIF-8-NH 2 , Kapton polyamide acid was selected as the polymer matrix. Results showed that the ZIF-8-NH 2 /Kapton MMMs has a good compatibility interface between ZIF-8 and Kapton because of the covalent bridging, even the filler loading up to 45% (mass). The 45% (mass) of ZIF-8-NH 2 /Kapton membrane showed 297 barrer (1 barrer = 10 −10 cm 3 ·cm·cm −2 ·s –1 ·cmHg –1 , 1 cmHg = 1333.22 Pa, standard temperature and pressure) of the permeability of H 2 and 43.9 and 62.2 of selectivities for H 2 /N 2 and for H 2 /CH 4 , respectively, which are beyond the upper limit of Robeson 2008.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
PHYSICS OF FLUIDS
·
2024
·Vol. 36
·期 7
·
IF 4.1
Li Mofan,Yang Donghai,Chen Conglei,Lv Shiyi,Miao Jiaxu,He Limin
Unconventional crude oil and offshore oilfield extraction often lead to the formation of stable oil–water emulsions with high mineralization, posing significant threats to environmental protection and pipeline transportation safety. Electric–magnetic coupling separation technology represents a novel approach to emulsion breaking, offering superior separation performance compared to the conventional electric coalescence methods. However, its underlying mechanism remains elusive. To address this gap, this study comparatively investigates the liquid bridge dynamic during droplet coalescence under a single electric field and electric–magnetic coupling field conditions. High-speed camera experiments reveal that synchronized coupled magnetic fields suppress the extension of liquid bridges, with this suppression effect being augmented by increasing ion concentration and electric field strength. Nevertheless, the enhancement of the inhibition effect is not pronounced at electric field strengths up to 224 kV m −1 and within the frequency range of 50–500 Hz. Molecular dynamics simulations demonstrate that the mutual repulsion effect between water molecules and the hydration effect between water molecules and ions are intensified under the coupling field. Finally, by integrating flow field and velocity analyses, a mechanism is proposed to elucidate the hysteresis in the evolution of liquid bridges, attributed to the mutual repulsion of water molecules hydrated by deflecting ions and convecting water molecules in the coupled field. This study offers valuable insights for the development of electric–magnetic coupling separation techniques, with implications for mitigating oil contamination and facilitating dewatering treatments.
研究领域:
石油工程
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环境科学
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物理学
✓ 已验证
产品关联
DOI
高影响因子
Soft Matter
·
2012
·Vol. 8
·期 26
·7036-7043
·
IF 4.39
Chuanzhuang Zhao,Guangcui Yuan,Di Jia,Charles. C. Han
In this work, aggregation and gelation behaviour of mixed suspensions of polystyrene microspheres and poly(N-isopropylacrylamide) microgels were studied. In dilute microsphere suspensions, with increasing concentration of microgel (ϕMG), microspheres first aggregated with each other through the bridging of the microgels, then dispersed individually when saturated adsorption was achieved, and finally depletion clusters formed at even higher concentrations of microgel. The concentration of microgel for saturated adsorption (ϕ*MG) is in a linear relationship with the given concentration of microsphere (ϕMS). For given ϕMS, the largest bridging clusters formed at ϕMG ≅ 0.5 ϕ*MG. In concentrated microsphere suspensions, with increasing ϕMG, the mixed suspensions showed a liquid–“bridging gel”–liquid–“depletion gel” transition. The maximum modulus and yielding stress of the bridging gel are also obtained at ϕMG ≅ 0.5 ϕ*MG. The gelation of the microsphere can be explained by the percolation of the clusters and the elasticity of bridging gel arising from the mutual attractions between the microspheres.
研究领域:
材料科学
·
胶体化学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2017
·Vol. 28
·期 5
·1704956
·
IF 12.124
Xue Yuan,Wu-Cheng Nie,Chen Xu,Xiao-Hui Wang,Qian Xiao,Fei Song,Xiu-Li Wang,Yu-Zhong Wang
Free-standing CaCO 3 materials are an important member in biological systems because of their existence in many natural organisms such as nacre, shell, and crustacean cuticle. However, toughness of those artificial mineral films is sacrificed once their inorganic content is up to 90%, thus free-standing characteristics have seldom been achieved for CaCO 3 films, let alone their real applications. Herein a fast and simple method for constructing hydrogel “bridges” for CaCO 3 microparticles is presented, developing highly flexible free-standing CaCO 3 films with only 5% organic content. Such integrated films have underwater superoleophobicity and self-cleaning function, which guarantee their repeated application in oil/water separation. Furthermore, heavy metal ions can be efficiently removed by simple filtration with the films. Because of the self-similar structure, the films are able to resist mechanical abrasion without losing the anti-wetting property and separation efficiency. The free-standing CaCO 3 films are put forward for the first time to practical application, demonstrating the strategy can bring a brilliant prospect to artificial biomineral materials.
研究领域:
材料科学
·
生物仿生学
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Huijuan Zhu,Yibing Xie
The bridge molecule-reinforced activated carbon fiber-m-aminobenzenesulfonic acid-polyaniline (ACF-mABSA-PANI) is designed and fabricated as braidable-supercapacitor electrode to achieve long cycle life and high capacitive performance. The mABSA acts as bridge molecule to form amide bond between mABSA and ACF, as well as sulfonamide bond between mABSA and PANI, which is confirmed by infrared spectrometer and X-ray photoelectron spectroscopy. The interfacial interaction between ACF and PANI is enhanced by chemical bonding, thus alleviating the shedding of polyaniline and improving the cycle life of ACF-mABSA-PANI. The electrostatic potential and Mulliken charge analysis calculations indicate that ACF-mABSA-PANI has an extended delocalized π-π conjugation system. The bridge molecule of mABSA improves the free electron migration efficiency between PANI and ACF, leading to an increase in the specific capacitance of ACF-mABSA-PANI. As a result, ACF-mABSA-PANI presents much higher specific capacitance of 599.3F/g at 0.5 A/g and much higher capacitance retention ratio of 93.8 % after 2000 charge/discharge cycles at 2 A/g while ACF-PANI only keeps 335.0F/g and 54.4 %. Braidable-supercapacitor based on ACF-mABSA-PANI electrode provides an energy density of 39.83 Wh kg −1 at a power density of 900 W kg −1 and maintains a high capacitance retention of 78.1 % after 2000 charge/discharge cycles at 2 A/g. Well-designed ACF-mABSA-PANI presents the potential and promising application for wearable electrochemical energy storage devices.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
FUEL
·
2021
·
IF 6.609
Ze Fang,Zhiguo Zhao,Nan Li,Zhexin Zhu,Wangyang Lu,Fengtao Chen,Wenxing Chen
An environmentally friendly desulfurization technology was constructed innovatively through coupling extraction and oxidation technique under mild conditions. A biomimetic catalytic system was built by O-bridged diiron perfluorophthalocyanine (FePcF 16 -O-FePcF 16 ) and hydrogen peroxide, and its displayed excellent catalytic activity and satisfactory regenerative performance for the oxidative desulfurization reaction. A mixed solvent of ethanol and water (volume ratio 9:1) was used as a “green” extractant with the property of low cost and low toxicity. It was found that 99% of the conversion rate of dibenzothiophene was achieved successfully after 2 h operation at 30 °C. The catalyst system was cycled 6 times without significantly reducing the removal of DBT. The catalytic activity was in the order of dibenzothiophene > 4,6-dimethyldibenzothiophene > benzothiophene. In addition, a possible reaction mechanism of the extraction and oxidative desulfurization was proposed and confirmed by electron paramagnetic resonance tests, gas chromatograph-mass spectrometer and electrospray ionization–mass spectrometry. The results demonstrated that the high-valent iron-oxo (Fe(IV) = O) was the main active species and this technology provides a novel idea for the design of high-efficiency, energy-saving and environmentally friendly desulfurization system.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 23
·14456-14466
·
IF 4.036
Yang Liu,Chengxuan Wu,Xiaofang Lv,Xinyi Xu,Qianli Ma,Jiawei Meng,Shidong Zhou,Bohui Shi,Shangfei Song,Jing Gong
In the exploitation of deep-sea oil and gas resources, the multiphase production and transportation process is frequently plagued by pipeline blockage issues. Especially when hydrates and wax coexist simultaneously, the viscosity and plugging tendency of multiphase flow systems will synergistically increase. Understanding the evolution of morphology of hydrate particles and the agglomeration characteristics of hydrate particles in the presence or absence of wax crystals is crucial to flow assurance industry. With the assistance of a visualized reactor equipped with a three axis moving platform, microscopic images of cyclopentane hydrate during hydrate growth were obtained, and the cohesive force between hydrate particles was measured. It was found that during the hydrate growth on wax-free water droplets, the untransformed water inside the particles gradually wetted the surface of the particle. With the increase in temperature and contact time, the shell of hydrate particles changed from solid and rough to smooth and moist. The cohesive force measured in this work ranges from 3.14 ± 0.52 to 11.77 ± 0.68 mN m−1 with different contact times and temperature. When the contact time was 0 s and 10 s, the cohesive force between particles increased first and then stabilized with temperature. When the contact time was 20 s, the cohesive force was greater than the first two cases and showed an overall stable trend. An interesting phenomenon was also discerned: a large water bridge between particles formed during their separation process. For the wax-containing system, it required a longer time for water droplets to be converted into hydrate particles than that for wax-free systems. After wax participated in hydrate growth, hydrate particles showed the properties of elasticity and stickiness, which resulted in a larger liquid bridge between hydrate particles after their contact. It was suggested that wax crystal would alter the shell structure of hydrate particles, and change the surface properties of hydrate particles and the formation process of the liquid bridge, leading to significant and rapid increase in the cohesive force.
研究领域:
流变学
·
海洋油气开发
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胶体与界面科学
·
能源工程
·
流动保障
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）