INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2022
·Vol. 46
·期 11
·15722-15732
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IF 4.672
Yu Bai,Wenjuan Qiu,Shuangfeng Wang
Summary At present, there are few kinds of phase change materials that suitable for medium temperature heat storage. Among them, sugar alcohols have broad application prospects in the heat storage at medium temperature due to their suitable phase transition temperature. In this work, eutectic phase change material (PCM) was prepared with D-mannitol as PCM and KBr as melting point modifier. Expanded graphite (EG) was used as thermally conductive support network to prepare shape-stable composite phase change material (CPCM). The prepared CPCM—10% EG/PCM has an appropriate phase transition temperature (136.88°C), high phase melting enthalpy (215.7 J/g), and good photothermal conversion (81.9%). The thermal conductivity of 10% EG/PCM reached 6.01 W/(m K), which is approximately 10 times higher than D-mannitol (0.603 W/(m K)). Because of its excellent thermal properties, the applications of CPCM in energy storage and photothermal conversion can be further broadened.
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Food & Function
·
2022
·Vol. 13
·期 14
·7507-7519
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IF 6.317
Meng Ru,Wanwan Wang,Zhenya Zhai,Ruxia Wang,Yumeng Li,Jiang Liang,Damini Kothari,Kaimin Niu,Xin Wu
The nicotinamide adenine dinucleotide (NAD+) level shows a temporal decrease during the aging process, which has been deemed as an aging hallmark. Nicotinamide mononucleotide (NMN), a key NAD+ precursor, shows the potential to retard the age-associated functional decline in organs. In the current study, to explore whether NMN has an impact on the intestine during the aging process, the effects of NMN supplementation on the intestinal morphology, microbiota, and NAD+ content, as well as its anti-inflammatory, anti-oxidative and barrier functions were investigated in aging mice and D-galactose (D-gal) induced senescent IPEC-J2 cells. The results showed that 4 months of NMN administration had little impact on the colonic microbiota and NAD+ content in aging mice, while it significantly increased the jejunal NAD+ content and improved the jejunal structure including increasing the villus length and shortening the crypt. Moreover, NMN supplementation significantly up-regulated the mRNA expression of SIRT3, SIRT6, nuclear factor E2-related factor 2 (Nrf2), heme oxygenase-1 (HO-1), the catalytic subunit of glutamate-cysteine ligase (GCLC), superoxide dismutase 2 (SOD2), occludin, and claudin-1, but down-regulated the mRNA expression of tumor necrosis factor alpha (TNF-α). Specifically, in the D-gal induced senescent IPEC-J2 cells, 500 μM NMN restored the increased mRNA expression of interleukin 6 (IL6ST), IL-1A, nuclear factor (NF-κB1), and claudin-1 to normal levels to some extent. Furthermore, NMN treatment significantly affected the mRNA expression of antioxidant enzymes including NQO1, GCLC, SOD 2 and 3, and GSH-PX1, 3 and 4. In addition, 200 μM NMN enhanced the cell viability and total antioxidant capacity and lowered the reactive oxygen species level of senescent IPEC-J2 cells. Notably, NMN restored the down-regulated protein expression of occludin and claudin-1 induced by D-gal. The above data demonstrated the potential of NMN in ameliorating the structural and functional decline in the intestine during aging.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Xianwei Li,Shuangxiu Ma,Fang Luo,Zehui Yang
Electrochemical hydrogenerations of nitrogen and oxygen molecules are of significance for nitrogen reduction and oxygen reduction reactions. Strengthening the binding between active sites and gaseous molecules is beneficial for enhancing the catalytic performance, especially in NRR catalysis. In this work, we have engineered the oxygen vacancies in Co 3 O 4 nanoparticles to boost the catalytic activity towards NRR and ORR. Ascribing to the p-d hybridization between Co and N atoms, N 2 electrochemical adsorption is promoted and the related energy barrier of N 2 protonation is significantly decreased by 50%; as a consequence, Faradaic efficiency is 11.2% at −0.4 V vs. RHE, 3-fold higher than Co 3 O 4 /CNT; moreover, due to the oxygen vacancies in Co 3 O 4-x /CNT leading to a higher oxophilicity, Co 3 O 4-x /CNT showed a better selectivity in ORR catalysis and kinetic current density at 0.85 V vs. RHE is boosted by 2.4 times. Consequently, Co 3 O 4-x /CNT exhibits a better rechargeable zinc air battery performance than Pt/C-IrO 2 by a factor of 2.2.
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Advanced Materials Interfaces
·
2022
·Vol. 9
·期 23
·2200913
·
IF 6.389
Jiameng Liu,Shuangrun Zhao,Changbao Wang,Bin Hu,Linghao He,Minghua Wang,Zhihong Zhang,Miao Du
A series of semiconductive cobalt-based metal–organic framework (MOFs) are prepared in this work using 2,3,6,7,10,11-hexaiminotriphenylene (HATP) as ligand and diverse metal ions as the second coordination centers (M = Mn, Ni, and Zn) (denoted as Co x M 3-x (HITP) 2 MOFs). The series of bimetallic Co x M 3-x (HITP) 2 MOFs exhibit ultrathin graphene-like nanostructure, highly d–π conjugated network, large specific surface areas, and diverse metal coordination modes. Density functional theory calculations reveal the unique synergism between M (M = Mn, Ni, and Zn) and Co nodes, in which adjacent layers of M atoms can efficiently modulate the electron densities of Co atoms in Co 3 (HITP) 2 . As compared, Co x Zn 3-x (HITP) 2 MOF possesses substantially enhanced electron density around the Co atoms, dual-metal atomic sites, and rich metal coordination modes, and exhibits superior electrochemical activity. Among them, Co x Zn 3-x (HITP) 2 displays the outperformed electrocatalytic performances of the oxygen evolution reaction (OER). Particularly, Co x Zn 3-x (HITP) 2 shows the lowest overpotential of 210 mV and good long-term stability. This work develops an efficient strategy for designing and regulating atomically dispersed catalysts in conductive MOFs toward clean energy applications.
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ELECTROCHIMICA ACTA
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2022
·
IF 7.336
Xiaohui Niu,Simeng Yan,Jinliang Chen,Hongxia Li,Kunjie Wang
Chiral metal-organic frameworks (MOF) have received extensive attention from researchers due to their chiral properties and potential applications in chiral-related fields. However, the construction of chiral metal-organic framework remains challenging due to the unpredictability of the synthesis process and the difficulty in keeping chirality during the growth of chiral MOF. Herein, a chiral MOF (D-His-ZIF-8) is reported for the construction of electrochemical sensing interface, which was synthesized via in-situ substitution of 2-methylimidazole on ZIF-8 by D-histidine (D-His). The introduction of Ketjen Black (KB) to the D-His-ZIF-8 sensing interface can improve its conductivity. The electrochemical recognition results show that KB/D-His-ZIF-8 has enantiodiscrimination ability for amino acids in voltammetry experiments. The best recognition efficiency is observed with Trp enantiomers . The recognition mechanism shows that the chiral nanochannel of D-His-ZIF-8 is conducive to the binding of L-amino acid, which will lead to the recognition of chiral molecules of different configurations. This research points to the possibility of developing further chiral recognition protocols based on D-His-ZIF-8, particularly with the suggested improvement in the preparation procedure of chiral MOF.
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MICROCHEMICAL JOURNAL
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2021
·
IF 4.821
Yueting Liao,Yaohai Zhang,Qiyang Zhao,Wei Xiang,Bining Jiao,Xuesu Su
Metal organic framework MIL-101(Cr) was successfully synthesized as a selective adsorbent by a facile self-assembly technique and combined with UPLC-MS/MS for enrichment and determination of neonicotinoids in fruit juices and tea beverages. Therein, MIL-101(Cr) was characterized by Fourier transform infrared spectrometry, scanning electron microscopy, X-ray diffraction, and N 2 adsorption–desorption isotherms. Box-Behnken design was applied to optimize the significant variables including the sorbent amount, pH of the matrix, eluant volume, extraction time and desorption time. The optimized conditions were sorbent amount of 20 mg, eluent volume of 1 mL, extraction time of 5 min and desorption time of 4 min. Under the optimized conditions, excellent sensitivity was achieved with the limit of detection of 0.0019–0.02 μg/L and limit of quantification of 0.0063–0.067 μg/L. Good linearity (R 2 ≥ 0.9988) was obtained within the range of 1–1000 μg/L, and the recovery was 71.04%-101.64% with relative standard deviations (RSDs) of 1.25%-8.82% in spiked samples. The inter- and intra-day RSDs were both<8.54%. The adsorption isotherms investigated for acetamiprid, thiacloprid, and imidacloprid pesticides better fitted with the Freundich adsorption isotherm with bimolecular adsorption capacity of 71.43, 68.49, and 50.38 mg/g, respectively. These results indicate that the nanocomposite is feasible for adsorption of the target analytes at trace amounts from fruit juices and tea beverages.
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JOURNAL OF MOLECULAR LIQUIDS
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2021
·
IF 6.165
Ting Huang,Huang-xian Zhang,Xiao-hua Zhang,Da-yong Peng,Xu-liang Nie,Jing Chen,Wan-ming Xiong
A kind of functionalized diallylimidazole ionic liquids (CnDAIMF) was synthesized and applied in the dehydration of D-fructose to produce 5-HMF under the microwave radiation. The results showed that X-ray, 1 H NMR and FT-IR confirmed the production. The target ILs existed in a highly centrally symmetric, and crystalline state at room temperature, with a good thermal stability up to 300 °C (HTD ≥ 340 °C). In the experiments of conversion D-fructose to 5-HMF, 5-HMF could be obtained via the catalysis of diallylimidazole IL whether in water or DMSO. The catalytic performance of these ILs was not much different from that of solid acid (like camphor sulfonic acid or solid carbon sulfonic acid), and which was higher than that of the monoimidazole hexafluorophosphate or imidazole class bromine salt, but there were no obvious changes can be found with the variation of carbon chain length between imidazole rings in diallylimidazole IL. The effects of temperature and solvent on the reaction were more significant. The optimized yield of 5-HMF was 52.59% at 185 °C in a water-C 2 DAIMF solvent (t = 10 min), while 73.71% at 195 °C in DMSO-C 2 DAIMF solvent. Furthermore, six CnDAIMF have a considerable effect on the conversion in water and 5-HMF yield of about 50% could be obtained, which is satisfactory compared with other similar processes, especially in the microwave system of aqueous solution. Therefore, this process may be benefit for many researches and applications related to functionalized ionic liquid research and biomass conversion applications.
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Polymers
·
2021
·Vol. 13
·期 23
·4074
·
IF 4.329
Duanwei Zhang,Fusheng Liu,Sheng Wang,Mengxi Yan,Xin Hu,Mengying Xu
This article proposes a method of increasing thermal conductivity (λ) by improving the λ value of a matrix and reducing the interfacial thermal resistance between such matrix and its thermally conductive fillers. D-GQDs (graphene quantum dots modified by polyetheramine D400) with a π–π-conjugated system in the center of their molecules, and polyether branched chains that are rich in amino groups at their edges, are designed and synthesized. AlN/DG-ER (AlN/D-GQDs-Epoxy resin) thermally conductive composites are obtained using AlN as a thermally conductive and insulating filler, using D-GQDs-modified epoxy resin as a matrix. All of the thermal conductivity, electrically insulating and physical–mechanical properties of AlN/DG-ER are investigated in detail. The results show that D-GQDs linked to an epoxy resin by chemical bonds can increase the value of λ of the epoxy–resin matrix and reduce the interfacial thermal resistance between AlN and DG-ER (D-GQDs–epoxy resin). The prepared AlN/DG-ER is shown to be a good thermally conductive and insulating packaging material.Keywords:thermal conductivity;graphene quantum dots;AlN;epoxy resin;thermally conductive composites
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ACS Applied Bio Materials
·
2020
·
IF 0
Ji Shen,Juan Qiao,Li Qi
Tuning the efficiency of enzymolysis in different environments is a challenge with important implications for the use of immobilized enzymes in biochemistry, pharmacology, and life science. Here, we demonstrate the use of a thermoresponsive porous polymer membrane for the construction of switchable enzyme reactors, which exhibited membrane surface property changes in diverse temperature environments. The enzyme reactor consisted of block copolymers, poly(styrene−maleic anhydride−oligo methacrylate−methoxyethoxy ethyl methacrylate) [P(St–MAn–OE–ME)], magnetic nanoparticles, and covalently bonded d-amino acid oxidase (DAAO). By varying the temperature between 25 and 39 °C, the self-assembly properties of the enzyme reactor could be controlled. Using d,l-Met as the substrate, the enzymolysis efficiency of the thermoresponsive porous polymer membrane enzyme reactor (t-PPMER) was evaluated by the chiral capillary electrophoresis technique. At higher temperatures, DAAO was embedded in the curled P(OE–ME) chains, resulting in improved enzymolysis efficiency owing to the confinement effect. At lower temperatures, inefficient enzymolysis occurred because of the stretching of the P(OE–ME) chains, which weakened the confinement effect. Remarkably, the enzymolysis rate of t-PPMER at 37 °C (3.1 mM·min–1) was 45 times higher than that at 25 °C (0.066 mM·min–1). The proposed protocol was successfully applied to the DAAO inhibitor screening. This approach capitalizes on the advantageous characteristics of the t-PPMER and provides inspirations for the construction of switchable enzyme reactors and the screening of enzyme inhibitors as potential drugs.
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INORGANICA CHIMICA ACTA
·
2020
·
IF 2.304
Yan-Long Lan,Xiao-Zeng Li,Tian-Sheng He,Li-Na Zhu
Three coordination polymers (CPs) {[CuL 2 Br]Br·6H 2 O} ∞ (1), {[CuL 2 Cl 2 ]·2.5CH 3 OH·3.5H 2 O} ∞ (2) and {[NiL 2 (NO 3 ) 2 ]·CH 3 CN·3CH 3 OH·H 2 O} ∞ (3) were prepared using a new d -ribose derivative ligand L ( L = 1,2,3,4-tetrakisisoniacyl- β - l -ribopyranose). X-ray single crystal analysis revealed that 1 – 3 all crystallized in the triclinic P 1 space group, all the CPs have 1-D metallomacrocycle strand structures, all the L ligands in the CPs show the same chiral type, and there are four pyridyls bonding with each metal centre arranged into a Δ-propeller configuration in all the three CPs. The same chiral type of the space group and the same chiral type of the propellers should be determined by the same chiral type of the L ligands. In addition, the slightly soluble powders of 1 and 2 displayed probe functions of detecting cysteine, glutathione and N -acetyl cysteine in UV–Vis spectrophotometric analysis of suspensions, which extended the application of UV–Vis spectrophotometry into suspension systems of micron particles.
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ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
You Zhou,Zhengyong Huang,Jian Li,Huijun Liao,Hanxiang Wang,Yu Wang,Guanglei Wu
A compound electrode of carbonaceous materials and NiCo 2 O 4 is extensively studied because of higher capacitance and better rate capability compared to those of pure NiCo 2 O 4 . However, the tedious preparation process, harsh synthesis condition, high consumption, and especially limited electrochemical property by using modifiers hinder its practical application. Herein, modifier-free electrodes (C/NiCo 2 O 4 ) with various morphologies based on D-ribose are successfully synthesized via a one-step hydrothermal-calcination method. D-ribose concurrently acts as carbon source and structure-directing agent. The structure of NiCo 2 O 4 changes from the nanosheets into nanowires after adding D-ribose. Each element is evenly distributed throughout C/NiCo 2 O 4 , significantly improving the electrical conductivity. Furthermore, there is a strong interaction between carbon and NiCo 2 O 4 , which keeps the structure stable. Benefiting from the structural characteristics, the C/NiCo 2 O 4 composites display the improved electrochemical performance. Remarkably, the maximum specific capacitance of C/NiCo 2 O 4 -2 is 1583.9 F g −1 at 2 A g −1 in 3 M KOH aqueous solution, and it exhibits remarkable rate capability of 1354.8 F g −1 even at 20 A g −1 . After 20,000 charge-discharge cycles at 20 A g −1 , a high capacity retention of 90.6% can be achieved. The C/NiCo 2 O 4 -2 is a promising electrode material for supercapacitor. In addition, a dynamic growth mechanism of C/NiCo 2 O 4 under the coordinate bond of metal ions with D-ribose is discussed in the paper.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Jie Hao,Fangxia Wu,Rong Tang,Yuanyuan Sun,Dehua Liu,Zhenqing Zhang
Oxidized starch (oxStarch) is a major derivative of starch. In present study, 4-acetamide-TEMPO system was firstly applied to prepare specifically oxidized starch, homogeneous 1,4-linked α-D-glucuronan. The impact of oxidant amount, 4-acetamide-TEMPO amount and reaction temperature on the properties of products were investigated. The product structures were characterized with 1 H NMR for degree of oxidation (DO), SEC-MALS for MW, MS for analysis of oxidized oligosaccharides , and in-source fragmented MS for analysis of oxidized polysaccharides . The results showed that the DO of oxStarches increased, but their MWs decreased with the raise of oxidant amount; higher 4-acetamide-TEMPO amount provided higher efficiency of specific oxidation of starch, in which the product has higher DO and MW; no significant difference have been observed between the oxStarches oxidized at 4 and 25 °C, but significant degradation was observed at 50 °C. In each product, having a MW distribution, the portion with smaller size has higher DO. While some unspecific oxidation was still observed observed on the second hydroxyl groups of sugar ring in the following order of priority, position 3 > 2 > 1 > 0.
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高影响因子
危险品化学品经营许可证（带存储）