ACS Sustainable Chemistry & Engineering
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2019
·
IF 6.97
Dafan Chen,Yiming Li,Mutai Bao,Yajie Hou,Jiafeng Jin,Zichao Yin,Zhining Wang
Because of the differences in physicochemical properties, it is of a great challenge to achieve efficient and simultaneous removal of various pollutants from water only based on one material. In this study, magnetic silica microrods (R-Fe3O4@SiO2) were successfully fabricated and used for the removal of coexisting pollutants (oil, heavy metals, soluble organic dyes) in water. R-Fe3O4@SiO2 could act as an effective solid stabilizer to disperse oil contaminants into droplets, due to its high adsorption energy at the oil–water interface. The encapsulated oil by R-Fe3O4@SiO2 could be effectively separated from water by applying a magnetic field. Simultaneously, R-Fe3O4@SiO2 could adsorb soluble cationic dyes and heavy metals through electrostatic interactions. The maximal removal capacity of R-Fe3O4@SiO2 for various pollutants in water was compared with that of some of the previously reported materials, and they showed a satisfied result. Additionally, the removal capacity of R-Fe3O4@SiO2 particles for multiple coexisting contaminants in water was evaluated. It is worthy to note that R-Fe3O4@SiO2 still showed a great removal capacity for multiple coexisting pollutants even after five runs of a sorption–desorption cycle. These results revealed that this technically simple R-Fe3O4@SiO2 material is a feasible material for the removal of various coexisting pollutants in water, and thus it holds great prospects as a candidate for the one-step water purification in practical applications.
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高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2018
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IF 4.514
Peijiang Liu,Zhengjun Yao,Vincent Ming Hong Ng,Jintang Zhou,Ling Bing Kong,Kan Yue
Although two dimensional (2D) materials have already been studied as promising microwave absorption materials due to fascinating layered structure, it is hard to achieve both thin coating and excellent absorbing capability. Herein, 2D hierarchical composites of nano-sized Fe 3 O 4 particles on MXenes (TiO 2 /Ti 3 C 2 T x /Fe 3 O 4 ) with different [TiO 2 /Ti 3 C 2 T x ]/[Fe 3 O 4 ] ratios were synthesized by using a moderate chemical hydrothermal reaction. Scanning electron microscope and transmission electron microscope techniques indicated that the surfaces of MXenes were densely covered with Fe 3 O 4 nanoparticles of ∼4.9 nm in diameter and TiO 2 particles. By tuning the ratio of [TiO 2 /Ti 3 C 2 T x ]/[Fe 3 O 4 ], microwave absorption capabilities in terms of the maximum reflection loss ( R L ) value and absorber thickness could be readily optimized. Specifically, the sample TiO 2 /Ti 3 C 2 T x /Fe 3 O 4 -5 exhibited a remarkable absorption performance, with a maximum reflectivity of −57.3 dB at 10.1 GHz and a band range below −10 dB to over 9.1–11.1 GHz at a thickness of 1.9 mm. Therefore, our 2D MXene composites are expected to be promising candidates as ultrathin and lightweight absorbing materials.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2018
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IF 2.829
Yuan Lu,Xiudi Xiao,Jiamei Mo,Changmeng Huan,Shuai Qi,Yongjun Zhan,Yanqing Zhu,Gang Xu
Inspired by the phase change materials (PCMs) based microcapsules, green phase change nanofibers mats with core-sheath structure based on paraffin wax emulsion (PWE) and polyvinyl alcohol (PVA) for thermal energy storage (TES) is obtained by coaxial electrospinning approach. The PWE could be encapsulated by PVA, simultaneously addressing the leakage issue effectively. In addition, the melting enthalpy (Δ H m ) increased from 3.16 J/g to 48.35 J/g as the core speed rate (R core ) increased from 0.1 to 2.0 μl/min, indicating higher R core can induce higher PWE encapsulation efficiency. Finally, the core-sheath structure PWE@PVA nanofibers mats have high Δ H m of 48.25 J/g and freezing enthalpy (Δ H c ) of -47.75 J/g. Furthermore, only slightly decreasing tendency on the enthalpy can be observed after 500 heating-cooling cycles, demonstrating good TES stability and practicability of the as-prepared PWE@PVA nanofibers mats. Hence, this study offers new idea for the fabrication method of green PCMs.
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高影响因子
PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2017
·Vol. 42
·期 11
·1252-1260
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IF 1.908
Na Sun,Zhenggang Xiao
A nanocomposite microsphere consisting of solid paraffin, nano-TiO 2 , nano-BN, zeolitic imidazolate framework-67 particles and polymethyl methacrylate was prepared and applied as a functional additive for high energy propellants (with about 23 wt % RDX) to reduce the barrel erosion and improve its combustion performance as well. High energy propellants modified with the nanocomposite were manufactured by a solvent extrusion technique. According to the scanning electron microscope and differential scanning calorimetry results, there exists a good compatibility between the nanocomposite and propellant matrix. The energy and combustion performance as well as erosion of the modified propellants were studied by a closed bomb test and an erosion tube device, respectively. Results showed that compared with the unmodified propellant, both the erosion and energy performance of modified high energy propellant gradually decreased with the increase of nanocomposites contents. When the content of nanocomposites was 5.1 %, the erosion mass of the modified propellant reduced to 37.0 % while the propellant force only decreased 5.7 %, indicating that the nanocomposite has enormous ability to improve gun erosion resistance while barely affect energy performance of propellant. Furthermore, the closed bomb burning curves of the samples showed that addition of nanocomposites to propellant matrix could prolong the combustion time, efficiently inhibit the initial generation rate of combustion gas, and further achieve the progressive burning of the propellants.
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高影响因子
ENERGY & FUELS
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2017
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IF 3.091
Na Sun,Zhenggang Xiao
Paraffin was encapsulated in a poly(methyl methacrylate) (PMMA)/BN/TiO2 hybrid shell to obtain a novel phase change material (PCM) microcapsule for latent-heat storage. Scanning electron microscope micrographs showed that the resultant composite PCMs exhibited a nearly spherical morphology with a size of 10–20 μm and BN/TiO2 nanoparticles were tightly embedded on the microcapsule surface. The results of thermogravimetric analysis and thermal conductivity test demonstrated that the PMMA/BN/TiO2 composite shell gave the microencapsulated paraffin an excellent thermal performance. Compared to pure paraffin, the thermal conductivity of microcapsules could significantly be enhanced by 117.0%, and the maximum decomposing temperature has an increase of 25.4 °C. The analysis of differential scanning calorimetry and thermal reliability test indicated that the composite PCMs also presented good heat storage capacity and high thermal reliability for latent-heat storage and release. After a heating–cooling cycle test was repeated 100 times, the composite microcapsule still showed a similar phase change performance as before, which can be attributed to the protective effect of PMMA/BN/TiO2 hybrid shell. With increased demands for economical and high-performance renewed energy storage materials, the prepared composite PCMs show great potential applications in thermal energy storage.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2017
·
IF 6.035
Guoping Chen,Xiong Song,Suqing Wang,Ying Wang,Tuo Gao,Liang-Xin Ding,Haihui Wang
Lithium–sulfur (Li–S) battery is considered as one of the most promising advanced energy storage devices. However, several critical issues remain which restrict their practical applications, especially the shuttle effect of soluble lithium polysulfides . Herein, we designed a lightweight multifunctional layer comprising reduced graphene oxide (rGO) and cobalt/nitrogen co-doped carbon nanofibers (Co-N-C) to modified the polypropylene (PP) separator to facilitate the electrochemical performance of Li–S batteries. The Co-N-C/rGO layer with abundant mesopores possesses strong immobilization ability of polysulfides and high electronic conductivity, which could work as an intrinsic physical/chemical frame work barrier and an upper current collector to trap and reutilize the polysulfides. Consequently, the Li–S battery with the modified Co-N-C/rGO/PP separator exhibits excellent cycling performance and good rate capability. A high discharge capacity of 1344 mAh g –1 at 0.1 C, 658 mAh g –1 at 5 C and a low capacity degradation rate of 28.8% after 500 cycles at 0.5 C were obtained. These exciting results indicate that this multifunctional Co-N-C/rGO/PP separator could be a promising separator candidate for Li–S batteries.
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高影响因子
LANGMUIR
·
2017
·
IF 3.833
Jinghui Wang,Renliang Huang,Wei Qi,Rongxin Su,Zhimin He
Enzyme-loaded water-in-oil Pickering emulsion is a promising system for biphasic catalytic reactions. In this paper, we report on oriented enzyme immobilization at the oil/water interface in a Pickering emulsion, in which CHO-Janus silica nanoparticles (CHO-JNPs) are utilized as a stabilizer of the emulsion and support for the enzyme to enhance both catalytic activity and recyclability. The catalytic performance of this immobilized enzyme (lipase from Candida sp.) was evaluated by esterification of hexanoic acid and 1-hexanol in a water/heptane biphasic medium. The results show that the specific catalytic activity of the immobilized enzyme (33.2 U mL–1) was 6.5 and 1.4 times higher than that of free enzyme (5.1 U mL–1) and encapsulated enzyme in the liquid core (23.3 U mL–1), respectively. Moreover, the immobilized enzyme demonstrated good stability and recyclability, retaining 75% of its activity after 9 cycles. We expect that oriented enzyme immobilization at the oil/water interface will be an important strategy for enhancing catalytic performance in Pickering emulsions.
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PubMed
高影响因子
Comparative Biochemistry and Physiology D-Genomics & Proteomics
·
2024
·
IF 2.2
Shengli Fu,Kun Qian,Xiao Tu,Jie Lu,Tuo Yao,Lingtong Ye,Jianmin Ye
The structure of fish intestines does not have a clear regional division, while the function of the intestines may be related to their structure. Therefore, in this study, the delimitation of intestinal segments in pufferfish ( Takifugu obscurus ) was achieved by morphological analysis. Subsequently, enzyme activity, intestinal microbiota, and gene expression were examined to compare the differences among the pufferfish various segments. According to four morphological parameters: height of mucosa folds (HF), width of mucosa folds (WF), thickness of muscularis (TM), and cross-sectional area (CSA), the pufferfish's intestine was divided into anterior intestine (AI), middle intestine (MI), and posterior intestine (PI). The activity levels of amylase, lipase, and trypsin in the AI and MI were significantly higher than these in the PI. According to the analysis of 16S rDNA, the dominant microbiota at the phylum level in the different segments were Epsilonbacteraeota, Spirochaetes, and Proteobacteria. At the genus level, there were variations observed in the relative abundance of Brevinema, Mycobacterium, Bradyrhizobium, and Microvirga. α diversity analysis revealed that the richness indexes (Ace and Chao1) were the lowest in the MI, while β diversity analysis revealed significant difference in intestinal microbial community composition among the three intestinal segments. Furthermore, RNA-Seq was used to identify differential expression genes (DEGs) and biological pathways among the different intestinal segments. The DEGs between the AI and MI were enriched in pancreatic secretion and protein digestion and absorption, those between AI and PI were involved in ascorbate and aldarate metabolism and glutathione metabolism, and those between MI and PI were involved in steroid biosynthesis, fat digestion and absorption, vitamin digestion and absorption, and glycine, serine and threonine metabolism. In conclusion, the presented results compare and analyze the differences in various intestinal segments of pufferfish, which will be conductive to future exploration of the functions of these different segments.
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高影响因子
COMPOSITE STRUCTURES
·
2024
·
IF 6.3
Yuchen Guo,Pengwan Chen,Rui Liu,ZhijianYang,Feng Zhang,Liyang Feng,Kezhen Lv,Bo Zhou,Gaoyang Hu
As the predominant component in polymer bonded explosives (PBX), explosive crystals is an important factor affecting the compressibility of PBX powder. To obtain the effects of crystal quality on the mechanical properties and meso -mechanical behavior of PBX powder during die pressing, the compaction density, Brazilian strength, as well as crack propagation and energy dissipation mechanisms were systematically studied based on experiments and Discrete Element Method (DEM) simulations. The experimental results revealed that, under identical pressure, PBX parts composed of 1,3,5,7-tetranitro-1,3,5,7-tetraazecycloctane (HMX) crystals with more internal defects and lower strength will exhibit higher density and Brazilian strength. The simulation results demonstrated that crystal fragmentation occurs throughout the pressing process. The increased Brazilian strength of PBX containing low quality crystals may be attributed to more defects and larger specific surface area of the crystals. Crystal fragmentation can effectively promote particle rearrangement, resulting in higher strain of the PBX powder. During the compression process, the lower the crystal quality, the greater their susceptibility to fracture and the reduced conversion of external work into elastic potential energy. Consequently, the increase in PBX size caused by the release of elastic potential energy after unloading is therefore minimized, resulting in improved compressibility of the PBX.
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LANGMUIR
·
2024
·
IF 3.7
Man Li,Min Luo,Xiaoxiao Niu,Angsen Sheng,Zhen Wang,Xiaoqing He,Huaiyu Bu,Gang Xie
Synthesis methods of carbon nanomaterials have been developed vigorously in recent years, among which a simple, green, and mature approach is of more research significance. Carbon nanomaterials have depicted an impact on the growth and development of plants. In this study, a new type of carbon nanomaterial, superhydrophilic carbon aerogel (CA), was synthesized via a hydrothermal process using carbohydrates and water-soluble polymers as raw materials. Characterized by scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, powder X-ray diffraction, and N2 adsorption analysis, the exemplified CA presented to have porous three-dimensional network structure composed of individual particles with diameters of 25 nm, with reactive surface, single composition, high specific surface area (89.94 m2·g–1), and wide range of density variation. The 9 mg·mL-1 CA suspension had a significant positive effect on the root growth of wheat seedlings, with promoted root elongation (about 67.17% longer) and root diameter (about 28.95% thicker) compared with those of the control group. The cytological results suggested that CA treatment triggered the propagation of meristematic cells, and the increased number of meristematic cells (65.79% more than the control group) led to enhanced root growth by upregulated expression of related phytohormone genes in wheat seedlings.
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PubMed
高影响因子
CARBON
·
2025
·
IF 11.6
Xiao Chen,Jinjie Lin,Yuhao Feng,Keke Chen,Mulin Qin,Shenghui Han,Yu Jiang,Zhenghui Shen,Yang Li
The pivotal attributes of high light absorption and thermal conductivity are paramount for initiating photothermal conversion and storage within phase change materials (PCMs). However, previous photothermal initiators predominantly harness single- or dual-dimensional hybrid frameworks, the exploration of multidimensional engineering design remains scarce. Herein, we constructed multidimensional heterogeneous carbon-metal interconnected network integrating three-dimensional carbon foam (CF), one-dimensional carbon nanotubes (CNTs), and zero-dimensional Co nanoparticles via in-situ chemical synthesis and high-temperature carbonization protocols. This obtained hierarchical heterogeneous carbon-metal hybrid, when endowed with phase change properties via stable encapsulation of PCMs, exhibits remarkable thermal energy storage without liquid leakage and photothermal conversion capacity. The integration of localized surface plasmon resonance-active Co nanoparticles and photophilic CF/CNTs carbon hybrid confers excellent broadband full-spectrum sunlight absorption to composite PCMs. The cobalt-catalyzed interconnected multidimensional carbon-metal network with low interfacial thermal resistance facilitates fast transport of photons and phonons in composite PCMs. Resultantly, carbon-metal hybrid based composite PCMs synergistically yield an ultrahigh photothermal conversion efficacy of 97.07 %, a stable high voltage output of 246.9 mV, and robust cyclic operational stability. Our proposed multidimensional engineering design strategy offers new insights into the development of next-generation high-performance photothermal PCMs.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 34
·期 45
·2406236
·
IF 18.5
Hao-Yu Zhao,Xin Wang,Jing Wu,Chao Shu,Fu-Lin Gao,Changjun Li,Xiao-Hang Lu,Yan Zhang,Qianlong Wang,Xiaofeng Li,Zhong-Zhen Yu
To alleviate resource shortage and environmental pollution, solar energy can be converted into thermal energy stored in phase change materials and in turn generate electrical energy. To enhance the solar energy utilization efficiency of solar-thermal-electrical conversion devices and prevent the heat loss to the environment at night, an intelligent solar-responsive phase-change system is innovatively designed consisting of a graphene aerogel film/paraffin wax stamen with an ultra-high thermal conductivity of 46.7 W m −1 K −1 , and thermally preserving aerogel film/liquid crystal elastomer bilayer petals that can bend solar-responsively by the synergistic effect of solar-thermal energy conversion and heat-induced contraction. The solar-responsive phase-change system achieves daytime blooming for solar-thermal conversion with simultaneous energy storage and nighttime closing for minimizing heat loss to the environment, exhibiting a high solar-thermal conversion and energy storage efficiency of 89.4% and delaying its temperature drop by the thermal preservation effect of the petals. The assembled solar-responsive solar-thermal-electric generator can reach an output voltage of 1033.8 mV at a light intensity of 500 mW cm −2 and continue to generate electrical energy during nighttime, holding tremendous promise in efficient solar energy conversion, storage, and utilization.
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危险品化学品经营许可证（带存储）