Nature Communications
·
2025
·Vol. 16
·期 1
·1-15
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IF 15.7
Xu Wenjun,Cui Jiarong,Ma Yao,Hu Zhanpeng,Qi Yuyang,Li Xinying,Zhong Yuchen,Luo Tao,Chu Xuyang,Wu Linjing,Ling Weisong,Zhou Wei
Thermal management using a vapor-liquid two-phase circulation system is challenging in compact and complex-shaped electronic devices. In this study, we design and fabricate a heat pipe that can adapt to various shapes, regardless of space constraints. The heat pipe is capable of bending or twisting in three dimensions, making it suitable for electronic devices of arbitrary shapes. It effectively transfers heat from in-plane chips to out-of-plane spaces through flexible circulation pathways. This two-phase heat cycle system achieves an ultra-high thermal conductivity of up to 11,363 W/m·K. The flexible and adaptive design strategy enables efficient heat transfer in complex and compact environments.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Ming-Long Wang,Yi-Fei Sun,Hong-Nan Chen,Jin-Rong Zhong,Liang-Liang Ren,Ming Wang,Dan Rao,Yong-Quan Liu,Yi-Bo Hao,Bei Liu,Chang-Yu Sun,Guang-Jin Chen
Hydrate-based CO 2 storage is a highly promising technology for long-term stable CO 2 storage in sediments. However, the unclear displacement and hydration mechanisms, along with the low conversion rate of CO 2 hydrates, have hindered the field application. Here, we report a method of the injection of CO 2 /water emulsion to replace liquid CO 2 to regulate the ratio of CO 2 to water in the sediment pores and to enhance their contact ability, which can significantly improve the CO 2 hydrate conversion rate. Compared to liquid CO 2 injection, emulsion injection can flow through more sediment pores with an increase in displacement efficiency by 45 %-62 %, which leaves a CO 2 -to-water ratio within the pores that is more suitable for hydrate formation, ultimately tripling the hydrate conversion rate. We have outlined the hydrate growth mechanisms for both injection forms, where the micron-sized CO 2 droplets within the emulsion can greatly reduce the barrier effect of hydrate film. Under the combined influences, the CO 2 storage density in hydrates up to 91.2 kg/m 3 for CO 2 /water emulsion injection is 47.8 % higher than that of 61.7 kg/m 3 for liquid CO 2 injection. Our work provides a new approach to high conversion CO 2 hydrate sequestration in submarine sediments.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2017
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IF 3.671
Chao Liu,A.M. Omer,Xiao-kun Ouyang
In the present study, new composite beads based on carboxymethyl cellulose (CMC)/k-carrageenan (kC)/activated montmorillonite (AMMT) were prepared for adsorptive removal of cationic methylene blue (MB) as a dye model. The structure and morphology of the composite beads were investigated by FT-IR and SEM, while the thermal properties were tested using TGA. Factors affecting the removal percent of MB such as CMC/kC/AMMT ratios, initial MB concentration, pH medium, adsorbent dosage, solution temperature, and agitation speed were also explored. Results demonstrated that MB removal (%) exceeded 92% after 120 min using CMC/kC/AMMT (1:1:0.4 ratio) compared to 69% in case of free AMMT beads. Moreover, data obtained from isotherm studies were fitted well to Langmuir model (R 2 = 0.999), and the kinetics of adsorption followed pseudo-second order model. Finally, the composite beads showed good reusability for MB dye removal with high efficiency. Results obtained from this study suggest that the prepared composite beads could be applied effectively for removing cationic dyes from aqueous solutions.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Peng-Fei Qiu,Xiu-Niang Tan,Zai-Yin Huang,Yan Zhou
The low conductivity of many traditional metal–organic-framework (MOF)-based electrode limits their developments in the field of electrochemical energy storage and still of great challenge. The controllable preparation of various kinds of nanomaterials using thiol-functionalized MOF shows great prospects. In this work, a thiol-functionalized metal–organic framework sheet structure ( Co-MOF/NF ) on nickel foam was successfully prepared by in situ interfacial growth synthesis, which was transformed into its derivatives S-doped β-Co(OH) 2 nanoflowers Co-x/NF ( x = 1, 2 and 6) in different concentrations of KOH solutions through ion etching/exchange reaction. The pristine thiol-functionalized Co-MOF/NF and its derivatives Co-x/NF ( x = 1, 2 and 6) nanoflower-like arrays could be used as positive electrode materials for effective supercapacitors. Among them, the transformation of the nanoflower-like Co-1/NF electrode exhibits excellent electrochemical properties with high areal capacitance (1925 ± 23 mF/cm 2 at 1 mA/cm 2 ), good rate performance, excellent conductivity and decent cycling stability. The Co-1//AC ASC device provides a high energy density of 0.176 mWh/cm 2 (92.6 Wh/kg) at a power density of 0.745 mW/cm 2 (392.1 W/kg). And this Co-1//AC ASC device exhibits a good cycling stability and practical application in energy storage field. This study provides a new strategy for the pristine thiol-functionalized MOF and its conversion nanostructures for energy storage applications.
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INDUSTRIAL LUBRICATION AND TRIBOLOGY
·
2024
·Vol. 76
·期 1
·70-80
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IF 1.5
Zhicai Du,Qiang He,Hengcheng Wan,Lei Zhang,Zehua Xu,Yuan Xu,Guotao Li
PurposeThis paper aims to improve the tribological properties of lithium complex greases using nanoparticles to investigate the tribological behavior of single additives (nano-TiO2or nano-CeO2) and composite additives (nano-TiO2–CeO2) in lithium complex greases and to analyze the mechanism of their influence using a variety of characterization tools.Design/methodology/approachThe morphology and microstructure of the nanoparticles were characterized by scanning electron microscopy and an X-ray diffractometer. The tribological properties of different nanoparticles, as well as compounded nanoparticles as greases, were evaluated. Average friction coefficients and wear diameters were analyzed. Scanning electron microscopy and three-dimensional topography were used to analyze the surface topography of worn steel balls. The elements present on the worn steel balls’ surface were analyzed using energy-dispersive spectroscopy and X-ray photoelectron spectroscopy.FindingsThe results showed that the coefficient of friction (COF) of grease with all three nanoparticles added was low. The grease-containing composite nanoparticles exhibited a lower COF and superior anti-wear properties. The sample displayed its optimal tribological performance when the ratio of TiO2to CeO2was 6:4, resulting in a 30.5% reduction in the COF and a 29.2% decrease in wear spot diameter compared to the original grease. Additionally, the roughness of the worn spot surface and the maximum depth of the wear mark were significantly reduced.Originality/valueThe main innovation of this study is the first mixing of nano-TiO2and nano-CeO2with different sizes and properties as compound lithium grease additives to significantly enhance the anti-wear and friction reduction properties of this grease. The results of friction experiments with a single additive are used as a basis to explore the synergistic lubrication mechanism of the compounded nanoparticles. This innovative approach provides a new reference and direction for future research and development of grease additives.Peer reviewThe peer review history for this article is available at:https://publons.com/publon/10.1108/ILT-09-2023-0291/
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
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2024
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IF 4
Yuyao Jia,Yicai Ma,Juanfang Ma,Wenqian Li,Yongan Jin,Gang Han
To reveal the quality differences of dried jujube from different producing areas and explain the argument about the ‘origin-quality’ of fruits, physical measurements, texture profile analysis, and metabolomics were used to analyze the appearance, texture, and metabolites in dried Junzao. Results showed that Shufu Junzao (SF-JZ) had the best color and Wensu Junzao (WS-JZ) had the best texture. A total of 983 metabolites were identified in dried Junzao. And 254–291 differential metabolites were found between Taigu Junzao (TG-JZ) and Xinjiang Junzao (XJ-JZ), with 91 common differential metabolites, mainly saccharides, phenolic acids, flavonoids, terpenoids, and amino acids. Pathway enrichment analysis revealed the key differential pathways were starch and sucrose metabolism, amino acid metabolism, and phenylpropanoid biosynthesis. The quality evaluation indicated that WS-JZ had the best sensory quality, TG-JZ and Cele Junzao (CL-JZ) with best nutritional quality and health value, SF-JZ had better flavor, the overall quality was best in WS-JZ and Kuerle Junzao (KEL-JZ), indicating that Wensu and Kuerle may be high-quality planting sites for Junzao in Xinjiang. Finally, 22 biomarkers were screened for dried Junzao's traceability and origin discrimination. Theoretical resources for the high-quality growth, cultivation, and exploitation of jujubes from various places are provided by this work.
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POLYMER
·
2024
·
IF 4.1
Tianhao Yang,Jinghan Wu,Yihang Yao,Ke Wang,Qin Zhang,Qiang Fu
Polyvinyl alcohol (PVA) films have significant rigidity due to the large number of hydrogen bonds within and between molecular chains . This feature hinders their industrial applications. Small molecule plasticizers can effectively improve the toughness of PVA films. However, this improvement decreases their modulus and strength . In this study, the effect of individual plasticizer, namely, diethanolamine (DEA), glycerol (GLY), and H 2 O, on the mechanical properties was first studied. It was found that adding an individual plasticizer increase the toughness but decrease the modulus for all the three plasticized PVA films, with DEA decreased least. Then, the property changes caused by of H 2 O and plasticizer content in two synergic plasticizing systems of DEA/H 2 O and GLY/H 2 O were systematically investigated and compared to demonstrate further the different effects of DEA and GLY on the toughness and modulus of the PVA film. Results indicated that the modulus and toughness of PVA casted film with a 10% DEA content improved after the addition of 3% H 2 O for the DEA/H 2 O plasticizing system. Despite a large improvement in toughness, the strength was always largely reduced with the increase in H 2 O or GLY content for the GLY/H 2 O system. The infrared spectrum results showed that H 2 O could be physically combined with both PVA and DEA to construct a cross-linked hydrogen bond network, because of the relatively strong electronegativity of the N atom in DEA. However, forming such a cross-linked hydrogen bond network in the GLY/H 2 O system is difficult. Thus, only a plasticizing effect was observed in the PVA/GLY/H 2 O films. Our work provides a better understanding of the effects of plasticizer and H 2 O on the hydrogen bonding and properties of PVA films to achieve toughness-strength balance via synergic plasticization .
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiaolei Wang,Kunlong Zhao,Wenxin Cao,Dongchao Ji,Zhijie Ye,Zhenhua Su,Ge Gao,Zhuochao Wang,Chunqiang Sun,Yingqi Liu,Lan Zhang,Tianyu Zhang,Feiran Li,Jiaqi Zhu
High-performance aerogels are highly desirable in the fields of thermal barriers, drug delivery, and mechanical cushions; however, most of the reported aerogels are limited by complex preparation processes and single functionality. To address such issues, in this study, we prepare a series of aramid nanofiber (ANF)/polyimide (PI) multifunctional composite organic aerogels via a facile polyimide-coating-on-aramid nanofiber (PCoA) strategy. This strategy utilizes PI to coat on the surface of ANFs and construct numerous mesopores within the ANF three-dimensional network skeleton to make the ANF/PI composite aerogels exhibit superior multifunctional properties, such as outstanding thermal and acoustic insulation, mechanical strength, thermal stability, flame retardancy, and hydrophobicity. In particular, the as-prepared composite aerogels with a PI content of 20 wt% exhibit a thermal conductivity of 23.20 mW/mK, which is lower than that of air, and their specific Young’s modulus reaches 32.57 MPa/(g/cm 3 ), the highest among all previously reported organic aerogels, at a density of only 14.86 mg/cm 3 . The composite aerogels are destined to be extremely valuable as they can combine so many remarkable properties in a single package. Currently, the composite aerogels have been available in the form of ultrathin thermal insulation films at a thickness of only 100 μm, which can provide effective heat protection in microelectronic devices, and remain a terrific ability to operate under extreme conditions. Owing to these superior multifunctional properties, the ANF/PI composite aerogels show enormous potential for application in numerous fields, such as thermal management, environmental governance, catalysis, and energy storage.
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Frontiers in Microbiology
·
2024
·
IF 4
Lv Hanlin,Xia Xiaomin,Sun Sa,Niu Zhaojun,Liu Jie,Li Xue
Wound infection caused by multidrug-resistant bacteria poses a serious threat to antibiotic therapy. Therefore, it is of vital importance to find new methods and modes for antibacterial therapy. The cerium nitrogen co-doped titanium dioxide nanoparticles (N-TiO2, 0.05Ce-N-TiO2, 0.1Ce-N-TiO2, 0.2Ce-N-TiO2) were synthesized using hydrothermal method in this work. Subsequently, electrospinning was employed to fabricate Polylactic acid (PLA) electrospun membranes loaded with the above-2 mentioned nanoparticles (PLA-N, PLA-0.05, PLA-0.1, PLA-0.2). The results indicated that cerium and nitrogen co-doping have enhanced the visible light photocatalytic efficiency of TiO2 nanoparticles and enabled the conversion of ultraviolet light into harmless visible light. The photocatalytic reaction under visible light irradiation induced the generation of ROS, which could effectively inhibit the bacterial growth.The antibacterial assay showed that it was effective in eliminating S. aureus and E. coli and the survival rates of two types of bacteria under 30 minutes of irradiation were significantly below 20% in the PLA-0.2 experimental group. Moreover, the bactericidal membranes also have excellent biocompatibility performance. This Biofriendly and biodegradable membrane may be applied to skin trauma and infection in the future to curb drug-resistant bacteria and provide more alternative options for antimicrobial therapy.
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SOFT MATERIALS
·
2025
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IF 1.4
Weimin Yan,Chengmin Hou,Chenyu Li
Ultraviolet curing (UV) water-based ink has the advantages of low viscosity, high gloss, and wide application range. However, there are some defects such as slow curing speed and low cross-linking degree. In this paper, the copolymer p(GMA-r-AA) was prepared via traditional radical polymerization using glycidyl methacrylate (GMA) and acrylic acid (AA) as monomers, and then p(GMA-r-AA) was modified by 2-hydroxyethyl methacrylate (HEMA) to obtain acrylic prepolymer P(GMA-r-AA)-g-HEMA with double bonds. Triethylenetetramine reacted with GMA to obtain a multifunctional reactive diluent triethylenetetramine hexamethacrylate glycidyl amide (TGMA). Fourier transform infrared (FTIR) spectroscopy combined with hydrogen nuclear magnetic resonance spectroscopy (1H NMR) was used to characterize the structures of the prepolymer P(GMA-r-AA)-g-HEMA and the reactive diluent TGMA. Three ingredients were needed to prepare UV curable ink: photoinitiator, multifunctional reactive diluent (TGMA), and acrylic prepolymer P(GMA-r-AA)-g-HEMA. The effects of the mass fraction and relative molecular weight of P(GMA-r-AA)-g-HEMA, the type and mass fraction of the photoinitiator, the number of functional groups, and the mass fraction of TGMA on the UV ink curing speed and wear resistance of the ink film were discussed. At a mass fraction of 1% for the photoinitiator TPO, the mass fraction of the reactive diluent was 55% with 4 functional groups, and the prepolymer had an average relative molecular mass of 5.63 × 104 g/mol. The UV water-based ink completed curing in 0.1 s, and the mass loss abrasion was 2–5% after 50 times. Finally, the UV ink was used to prepare UV conductive magnetic ink. The UV conductive and magnetic ink can be cured into a film in 0.1 s, no peeling phenomenon, with good magnetic properties.
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Nanomaterials
·
2024
·Vol. 14
·期 4
·361
·
IF 4.4
Shi-Long Gao,Ting-Ting Zhang,Li-Peng Qiu,Yu-Rui Zhang,Guo-Ting Cheng,Qi Liu,Wen-Peng Han,Seeram Ramakrishna,Yun-Ze Long
Herein, the preparation process, morphology, structure, and magnetic properties of La1.85Sr0.15CuO4(LSCO) cobweb-like nanofibers are reported. LSCO nanofibers with a regular grain size distribution are successfully prepared via electrospinning, followed by calcination. We conducted morphology analysis and elemental distribution using electron microscopy and energy-dispersive X-ray spectroscopy (EDS), respectively. Additionally, magnetic property testing was performed using a vibrating sample magnetometer (VSM) to confirm the superconducting properties of the samples. Interestingly, our samples exhibited a superconducting transition temperature, Tc, of 25.21 K, which showed some disparity compared to similar works. Furthermore, we observed a ferromagnetic response at low temperatures in the superconducting nanofibers. We attribute these phenomena to the effects generated by surface states of nanoscale superconducting materials.
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Journal of Energy Storage
·
2024
·
IF 8.9
Tianping Feng,Xuelai Zhang,Jun Ji
In the context of the dual‑carbon target, there is a high emphasis on the energy efficiency of traditional mechanical cold storage systems with significant power consumption . Additionally, the implementation of time-of-use electricity pricing has played a crucial role in driving the rapid advancement of energy storage technology . The application of energy storage technology in cold storage can significantly reduce the energy consumption of the refrigeration system , save operating costs by shifting peak demand to valleys, and reduce start and stop frequencies. Therefore, studying phase-change materials with high latent heat, low cost, and good performance for cold storage is of great practical application in cold storage. The paper developed four types of gel-type phase-change cold storage materials with high latent heat, low cost, and good cycle stability. These materials mainly consist of NH4Cl, KCl, and deionized water . The phase transition temperature ranges from −18 to −21 °C, the latent heat of phase change is approximately 260 to 289 J/g, and the thermal conductivity ranges from 0.58 to 0.60 W/(m·K), which can meet the cooling demand of cold storage facilities. Furthermore, by comparing the phase transition temperature, latent heat value of phase change, and cyclic stability, a gel-type PCM with good comprehensive properties was selected for corrosion and corrosion inhibition studies with five common metal samples in welded and non-welded forms. The results showed that material B2 had slight corrosion on 1060 aluminum , 6061 aluminum, and 304 stainless steels , but no obvious corrosion phenomenon was found on 316 stainless steels . The corrosion rate of the material on red copper was the highest, and the corrosion was too strong. In addition, the corrosion of welded parts is more serious than that of non-welded parts, and the welding points are more susceptible to corrosion. Adding the corrosion inhibitor BTA to material B2 can reduce the corrosion rate of red copper by more than 94 %.
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