SCIENTIA HORTICULTURAE
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2023
·
IF 4.3
Xiaoqian Qu,Xince Wang,Maorun Fu,Jianfeng Cheng,Jingjing Liu,Xianghua Wang,Jia Li,Jinjin Wang,Ziqi Wang,Fei Sun
The concentrations of (E) -2-hexenal (E2H) have obvious correlation with the color change process in tomatoes during ripening. It is proposed that E2H may play a role in regulating the chloroplast degradation. In this study, the exogenous E2H was applied to tomato fruits and plants to create a higher concentration of E2H atmosphere than naturel released. A set of indices in response to E2H were detected. The color change was inhibited. The ethylene pathway and the involved genes were limited. The results of subcellular structure changes, the fatty acid profiles and the malondialdehyde (MDA) content supported that the chloroplast membranes were specifically degraded. The hydroperoxide lyase (HPL) and the lipoxygenase (LOX) pathway was activated to decompose the free fatty acids. In tomato plants at the harvest stage, E2H did not affect the ripe tomatoes, but inhibited the color changes of green tomatoes, accelerated the withering of the leaves and the branches, and made the fruits fall off easier. The chlorophagy was activated and the autophagosomes were observed to decompose the chloroplasts in leaves. In conclusion, E2H accelerated the chloroplast degradation, by which the color changes were regulated.
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International Journal of Electrochemical Science
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2023
·
IF 1.5
C.B. Song,Y.L. Zhao,D.M. Song,L. Zhu,X.Q. Gu,Y.H. Qiang
Dye-sensitized solar cells (DSSCs) based on TiO2 nanotube/nanoparticle (NT/NP) photoanodes and Cu2SnSe3 (CTSe) counter electrodes were fabricated. The effect of the thickness of the CTSe films on the DSSC performance was investigated. It was found that DSSC efficiencies firstly increased and then decreased with increasing the film thickness. The optimized DSSC efficiency of 3.14% was achieved at a suitable film thickness (2.9 μm). This work presents a new approach for developing low-cost alternative for expensive Pt in TiO2-nanotube-based DSSCs.
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Micromachines
·
2023
·Vol. 14
·期 7
·1302
·
IF 3.4
Chuang Wu,Jiju Sun,Binfeng Yin
Microfluidic chips have the advantages of miniaturization, integration, and portability, and are widely used in the early diagnosis of major diseases, personalized medical treatment, environmental detection, health quarantine, and other fields. The existing microfluidic chip manufacturing process is difficult to operate because of complex three-dimensional channels, complicated manufacturing steps, limited printing materials, the difficulty of operating the bonding process, and the need to purchase expensive new equipment. In this paper, an integrated molding method for microfluidic chips that integrates 3D printing and polymer dissolution technology is proposed. First, the channel mold of poly(vinyl alcohol) (PVA) or high impact polystyrene (HIPS) is dissolved to complete the manufacturing of the microfluidic chip channel. The integrated 3D-forming method of microfluidic chips proposed in this paper can manufacture microchannels inside the microfluidic chip, avoid the bonding process, and eliminate the need for rapid alignment of microchannels, material modification, and other operations, thus improving the stability of the process. Finally, by comparing the microchannels made by PVA and HIPS, it is concluded that the quality of the microchannels made by HIPS is obviously better than that made by PVA. This paper provides a new idea for the fabrication of microfluidic chips and the application of HIPS.Keywords:microfluidic;3D printing;bonding method;HIPS;PDMS
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FUEL
·
2023
·
IF 7.4
Qipeng Ma,Weiyao Zhu,Zhiyong Song,Jie Zhang,Bingbing Li,Wengang Bu,Bin Pan
Interfacial tension (IFT) and wettability are two key parameters determining pore-scale oil/water distributions and reservoir-scale hydrocarbon production performances. However, how ionic liquid (IL, a green, stable, and efficient chemical) will manipulate IFT and wettability for EOR in sandstone reservoirs has not been sufficiently investigated yet, and the underlying mechanisms at the micro-level are still unknown. In this study, the influences of two typical ILs at various concentrations (i.e., 0.01, 0.1, 1, and 5 mmol/L) on oil–water IFT and alpha-quartz (α-quartz) wettability were investigated. This study shows that low concentrations of ILs can greatly reduce alkane-water IFT, and gemini IL has higher interfacial activity than mono-cationic IL, which is due to the fact that gemini IL with longer alkyl chains is more likely to form conglomerates at lower concentrations. Both the advancing and receding contact angles increase continuously with concentration in ILs solution, which can be given responsibility for the decrease in IFT and the solid–liquid interaction resulting in an increased capacity of alkane droplets to migrate on the α-quartz surface. Additionally, the molecular dynamic simulations examined the micro-wetting process and interaction energy of the IL-alkane-quartz system, and revealed that ILs can effectively reduce interaction energy between octane droplets and α-quartz surface. These insights have promising applications to enhanced oil recovery and oil contamination removal at subsurface.
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FUEL PROCESSING TECHNOLOGY
·
2023
·
IF 7.5
Weicong Xu,Peijun Li,Nan Wang,Xiaowen Ding,Yujia Chen,Beichen Xue,Tao Li,Chao Liu,Rui Xiao
Electrocatalytic reduction is a promising strategy for CO 2 utilization, while the conversion of CO 2 to C 2 products usually suffers from the low selectivity. Herein, we report several high-performance Cu-OCN catalysts for electroreduction CO 2 -to-C 2 H 4 , which are prepared through the in-situ calcination of nanocube Cu 2 O and urea. The highest C 2 H 4 faradaic efficiency from Cu-OCN-10 reaches 55.97%, much higher than that from the pristine CuO counterpart (38.31%), with a partial current density of −12.83 mA cm −2 . Catalyst characterizations and first-principles density functional theory calculations reveal that the superior performance of CuO-OCN is attributed to the introduced nitrogen (N) species and oxygen (O)-vacancies. With the assistance of N species and O-vacancies, the adsorption of CO 2 on Cu-OCN-10 is thermodynamically favorable with the absorption energy of −0.69 eV. Meanwhile, the activation of CO 2 is promoted and the generated *CO intermediate on Cu-OCN-10 is stable, whose release needs to overcome an energy of 2.26 eV, thereby enhancing the C C coupling to produce C 2 H 4 . In general, the synergistic effects of N species and O-vacancies in Cu-OCN catalysts facilitate CO 2 electroreduction to C 2 H 4 .
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Innovative Food Science & Emerging Technologies
·
2023
·
IF 6.6
Li-Shuang Wang,Xiao-Shuai Yu,Ke-Xin Wang,Jin-Jie Huo,Xiao-Qi Ma,Yu-Min Duan,Zhi-Gang Xiao,Peng Wang
The presence of glutelin plays an important role in the textural properties of reconstituted rice, but available information is limited. Herein, a comprehensive assessment of the effects of multi-scale structure and intramolecular interactions of glutelin on the textural properties of reconstituted rice was performed. The results demonstrated that the hardness, adhesiveness, and chewiness of reconstituted rice were improved as the added ratio of glutelin increased and the internal structure changed by forming compact flake-like, fibrous branches, more α-helix and β-sheet structure, and enhanced intermolecular interactions. Furthermore, extrusion promoted the generation of special aroma substances by the Maillard reaction . Correlation analysis revealed that the hardness, adhesiveness, and chewiness of reconstituted rice were significant positive correlation with Tp, ∆H, β-turn, random coil, and free SH content, and negative correlation with α-helix of glutelin. These observations provide better insights into strategies for producing reconstituted rice by extrusion.
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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 22
·9181-9195
·
IF 4.5
Yu Jiaqi,Li Yuqi,Qin Feng,Lu Shaorong,Yang Chao,Li Yang,Zhou Wei
In this work, 1-aminoethyl-3-methylimidazolium bromide ionic liquid was used to modify the surface of graphene nanosheets (GNs) through “π–π” interaction to achieve good dispersion and conductivity. By introducing ionic liquid-modified graphene nanosheets (IGNs) into the PI matrix, the ultra-lightweight and multifunctional IGNs/PI aerogels were prepared via freeze-drying and thermal imidization. Benefiting from the porous structure and the introduction of conductive IGNs, the IGNs/PI aerogels exhibit excellent electromagnetic wave (EMW) absorption properties, compression properties, thermal insulation properties and thermal stability. Notably, when the volume content of IGNs is 10%, the IGNs/PI-10 aerogels show the best EMW absorption performance with a minimum reflection loss (RL min ) of −24.8 dB at 2.44 mm and an effective absorption bandwidth (EAB) of 3.6 GHz at 3.00 mm. These promising characteristics including excellent EMW absorption, compression properties and thermal insulation endow IGNs/PI aerogels great application prospects as multifunctional EMW absorbers.
Graphical Abstract
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JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Zhihong Lin,Ziyi Yuan,Kaifang Wang,Xuezhong He
Novel mixed matrix membranes (MMMs) with superior CO 2 /N 2 separation properties are of great importance for post-combustion CO 2 capture from flue gas . Metal-organic frameworks (MOFs) as one of the most attractive porous fillers for MMMs fabrication, are considered to provide a solid molecular sieving mechanism for enhancing CO 2 /N 2 selectivity. However, it causes the reduction in gas permeability and limits its further industrialization. Herein, we proposed a new strategy for filler functionalization by doping silver ions (Ag + ) into UiO-66-NH 2 nanoparticles through the double-solvent method and used for the preparation of advanced MMMs. The double-solvent method is benefits for the enrichment of Ag + in the hydrophilic pores of UiO-66-NH 2 . As a result, the prepared novel MMMs called Ag + @UiO@PIM-1 with the polymers of intrinsic microporosity (PIMs) as polymer matrix , show outstanding CO 2 permeability. According to the mixed gases (CO 2 /N 2 = 10:90) permeation experiments under 25 °C and 2 bar, the membrane with 30%Ag + @10%UiO loading achieves more than 65% increase in CO 2 /N 2 selectivity (∼30) and 120% in CO 2 permeability (>15,000 Barrer) compared to the pristine PIM-1 membrane. By optimizing the Ag + doping amount and Ag + @UiO loading content, the separation performance exceeds the 2019 CO 2 /N 2 upper bound. To figure out the separation mechanism, the pore texture properties and CO 2 affinity of the functional filler (Ag + @UiO) together with the membrane structure were characterized by XPS , PXRD , SEM, gas sorption , etc. The synergistic mechanisms by combing CO 2 facilitated transport and molecular sieving from pore regulation were identified to enable advanced CO 2 /N 2 membrane separation .
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Xiaolei Wang,Wenxin Cao,Zhenhua Su,Kunlong Zhao,Bing Dai,Ge Gao,Jiwen Zhao,Kechen Zhao,Zhuochao Wang,Tingting Sun,Jiecai Han,Jiaqi Zhu
Polymer-based thermally conductive materials are preferred for heat dissipation owing to their low density, flexibility, low cost, and easy processing. Researchers have been trying to develop a polymer-based composite film with excellent thermal conductivity (TC), mechanical strength, thermal stability, and electrical properties. However, synergistically achieving these properties in a single material is still a challenge. To address the above requirements, we prepared poly(diallyldimethylammonium chloride)-functionalized nanodiamond (ND@PDDA)/aramid nanofiber (ANF) composite films using a self-assembly strategy. Owing to a strong interfacial interaction arising from electrostatic attraction, ND particles attract strongly along the ANF axis to form ANF/ND “core–sheath” arrangements. These assemblies self-construct three-dimensional thermally conductive networks through ANF gelation precipitation, which was analyzed as the key parameter for the realization of high thermal performances. The as-prepared ND@PDDA/ANF composite films exhibited high in-plane and through-plane TCs up to 30.99 and 6.34 W/m·K, respectively, at a 50 wt % functionalized ND loading, representing the optimal values among all previously reported polymer-based electrical insulating composite films. Furthermore, the nanocomposites also achieved other properties necessary for realistic applications, such as outstanding mechanical properties, excellent thermal stability, ultra-low thermal expansion coefficient, excellent electrical insulation, low dielectric constant, low dielectric loss, and outstanding flame retardancy. Thus, this excellent comprehensive performance enables the ND@PDDA/ANF composite films to be used as advanced multifunctional nanocomposites in thermal management, flexible electronics, and intelligent wearable equipment.
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International Journal of Mining Science and Technology
·
2023
·
IF 11.8
Haoyong Yu,Yangge Zhu,Liang Lu,Xiaoxing Hu,Songqing Li
This study aims to investigate the effect of a cationic-anionic mixed collector (dodecyltrimethyl ammonium bromide/sodium oleate (DTAB/NaOL) on the selective separation of apatite, dolomite, and potassium feldspar. Herein, several experimental methods, including flotation experiments, zeta-potential detection, microcalorimetry detection, XPS analysis and FTIR measurements, were used. The flotation tests showed that dolomite and potassium feldspar can be successfully removed from apatite simultaneously when the molar ratio of DTAB to NaOL was 2:1 with pH 4.5. Zeta-potential and microcalorimetry detection suggested that NaOL and DTAB were adsorbed on the surface of dolomite and potassium feldspar respectively, and part of NaOL and DTAB formed co-adsorption on the surface of potassium feldspar to enhance the floatability of potassium feldspar. The XPS and FTIR spectra analysis demonstrated that the cationic collector, DTAB, was first adsorbed on the surface of potassium feldspar through electrostatic attraction in the DTAB/NaOL mixture system. Subsequently, the anionic NaOL collector and cationic DTAB collector form an electron neutralisation complex, thereby resulting in co-adsorption on the surface of potassium feldspar. NaOL was chemically reacted and adsorbed on dolomite surface, but almost no collector was adsorbed on apatite surface. Finally, the adsorption models of different collectors on mineral surface were obtained.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2023
·
IF 8.7
Zuozhu Yin,Min Li,Zihao Li,Yuanting Deng,Mingshan Xue,Yuhua Chen,Junfei Ou,Sheng Lei,Yidan Luo,Chan Xie
Traditional membranes are inefficient in treating highly toxic organic pollutants and oily wastewater in harsh environments, which is difficult to meet the growing demand for green development. Herein, the Co(OH) 2 @stearic acid nanocellulose-based membrane was prepared by depositing Co(OH) 2 on the nanocellulose-based membrane (NBM) through chemical soaking method, which enables efficient oil/water mixtures separation and degradation of pollutants by photocatalysis in harsh environments. The Co(OH) 2 @stearic acid nanocellulose-based membrane (Co(OH) 2 @stearic acid NBM) shows good photocatalytic degradation performance for methylene blue pollutants in harsh environment, and has significant degradation rate (93.66%). At the same time, the Co(OH) 2 @stearic acid NBM with superhydrophobicity and superoleophilicity also exhibits respectable oil/water mixtures separation performance (n-Hexane, dimethyl carbonate, chloroform and toluene) under harsh environment (strong acid/strong alkali), which has an excellent oil-water mixtures separation flux of 87 L·m −2 ·h −1 (n-Hexane/water) and oil-water mixture separation efficiency of over 93% (n-Hexane/water). In addition, this robust Co(OH) 2 @stearic acid NBM shows good self-cleaning and recycling performance. Even though seven oil-water separation tests have been carried out under harsh environment, it can still maintain respectable oil-water mixture separation rate and flux. The multifunctional membrane has excellent resistance to harsh environments, oil-water separation and pollutant degradation can be performed even in harsh environments, which provides a convenient way to treat sewage under harsh conditions efficiently and has great potential in practical application.
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Journal of Materials Chemistry B
·
2023
·Vol. 11
·期 31
·7410-7423
·
IF 7
Chenyu Tang,Zhaohui Dang,Teliang Lu,Jiandong Ye
The anti-washout ability of calcium phosphate cement (CPC) determines its effectiveness in clinical application. In the current research, the common method for improving the anti-washout ability of CPC is to add anti-washout polymer agents. Sodium polyacrylate powder is an excellent anti-washout agent but when bonded with CPC it basically degrades the anti-washout performance of CPC after γ-ray irradiation, and is widely used in the sterilization process of CPC products. Therefore, we propose a method for the preparation of a sodium polyacrylate solution through irradiation polymerization as curing solution for CPC. This method first uses γ-ray irradiation sterilization to improve the anti-washout ability of CPC directly. It not only avoids the adverse effects of γ-rays on anti-washout agents, but also the CPC blended using this sodium polyacrylate solution had good biological properties and injectability. It provides a new method for promoting the anti-washout properties of calcium phosphate cement, which is of great significance for expanding the clinical application of CPC.
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