ACS Applied Nano Materials
·
2023
·
IF 5.9
Xiaoqing Wang,Chengjiang Qian,Wenjie Pan
Extended utilization of polypropylene (PP) is compromised by its high flammability. Owing to the merits of easy preparation and abundance in raw materials, graphitic-like carbon nitride (g-C3N4, denoted as CN) is favored as flame retardant for PP. Nevertheless, it is hard to acquire the satisfying flame retardancy efficiency when CN dosage is low. Here, the interfacial assembly strategy is utilized to obtain the micro–nano structure of phosphorus-doped CN/CoMoO4 (PCN–Co) as flame retardant for PP. When using 2.0 wt % PCN–Co, the decomposition temperatures are markedly enhanced, confirming the delayed thermal degradation. Peak heat release rate and total heat release values are impaired by 33.6 and 12.0%, implying the inhibited release of heat. Peak smoke production rate and total smoke production values are dampened by 45.1 and 34.9%, signifying hindered emission of smoke. In short, this work provides inspiration for the design of CN-based nanostructures, mining their potentials in polymer composite fields.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2022
·
IF 5.999
Zhiyuan Zhou,Jie Wang,Jiamin Zhang,Xiyue Duan,Weiming Lin,Kui Cheng,Wenjian Weng,Zuobing Chen
Surface potential of biomaterials is found to be important for wound healing. Here, poly(vinylidenefluoride-co-trifluoroethylene) (P(VDF-TrFE)) films with different surface potentials and piezoelectric responses were prepared and explored for the effect of surface potential on wound healing. The crystalline state of P(VDF-TrFE) films were characterized with X-ray diffraction (XRD), differential scanning calorimetry (DSC) and Fourier-transformed infrared spectroscopy (FTIR), illustrated that the electric polarization will promote the crystallization of the β phase of P(VDF-TrFE), in which the content of β phase increased from 82.9 % to 86.8 % compared with the control. Then, Kelvin potential and piezoelectric coefficient d 33 were to evaluate surface potential and polarization performance. Moreover, bovine serum albumin (BSA) adsorption and cell culture results showed that high surface potential can promote protein adsorption as well as fibroblast proliferation and macrophage polarization. Finally, in vivo experiments indicated that high voltage polarized P(VDF-TrFE) films can generate higher dynamic potential up to 2.3 V, and promoted wound healing from the phases of inflammation, proliferation and remodeling, the wound healing rate of which was 88.8 % ± 0.8 %, significantly higher than 79.1 % ± 2.5 % and 86.4 % ± 1.8 % of blank and control. In general, this work revealed that polarized P(VDF-TrFE) films can promote wound healing, shed light on designing wound healing materials with similar properties.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Tianyi Xu,Dongxu Jiao,Lei Zhang,Haiyan Zhang,Lirong Zheng,David J. Singh,Jingxiang Zhao,Weitao Zheng,Xiaoqiang Cui
Development of efficient electrocatalysts requires construction of catalytic surfaces with moderate H adsorption energy. Here, we address this challenge by Br-induced formation of P-poor defective nickel phosphide and show that the H adsorption energy can be optimized by regulating the vacancy concentration. We show that when such defective Ni 12 P 5−x Br x nanoparticles are distributed on the surface of Ni 2 P nanosheets (Ni 12 P 5−x Br x /Ni 2 P NS), excellent catalytic activity for water splitting is obtained in alkaline media. Density functional theory computations revealed that Br doping induce the formation of a P-poor nickel phosphide with vacancies, leading to an optimal H adsorption strength with a volcano-type relationship. This is the best reported for a non-precious metal phosphide at present: the overpotential for HER is 18 mV at 10 mA cm −2 and 155 mV for OER. This leads to an exceptionally low cell voltage requirement of only 1.44 V to drive overall water splitting in an alkaline electrolyzer.
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2022
·Vol. 24
·期 22
·4057-4062
·
IF 3.756
Dunyuan Jin,Fen Qiao,Wenjie Liu,Yanzhen Liu,Yi Xie,Haitao Li
Designing and building high-performance bifunctional electrocatalysts is critical for water splitting. Herein, an efficient P-doped molybdenum disulfide/nickel subsulfide (abbreviated as P-MoS2/Ni3S2/NF hereafter) catalyst was rationally prepared through a facile one-step hydrothermal process. The heterogeneous structure formed by the combination of MoS2 and Ni3S2 can improve the electrolytic performance of water in an alkaline medium. The addition of a P source in the reaction reduces the agglomeration of the catalyst, and the electronic structure of MoS2/Ni3S2 is simultaneously optimized by the doped P atoms in MoS2, thus promoting conductivity and increasing the valence state of the Ni species. Low overpotentials of only 136 mV and 95 mV are required to generate 10 mA cm−2 for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), respectively. Most significantly, when P-MoS2/Ni3S2/NF is used as the cathode and anode for the electrolysis of water, a voltage of 1.48 V is required to produce 10 mA cm−2. This work provides feasible ideas for the rational construction of bifunctional catalysts with outstanding performance, which may offer a reference for designing non-precious electrocatalysts for water splitting.
✓ 已验证
产品关联
DOI
高影响因子
Chemical Engineering and Processing-Process Intensification
·
2022
·
IF 4.264
Zhangcheng Gao,Jianqing Wang,Lianfang Feng,Xueping Gu,Jintang Duan,Cailiang Zhang
Under the conditions specified in this work, the polycondensation reaction to prepare rigid rodlike poly(p-phenylene-cis-benzobisoxazole) (PBO) is diffusion-controlled. This work aims to study the flow-driven polycondensation reaction of PBO. The effect of mixing efficiency through changing the stirring speed on the polycondensation reaction of PBO was first investigated in a paddle impeller reactor (PIR). In the initial stage of polymerization, the increase of stirring speed is obviously conducive to accelerating the polycondensation reaction. However, the promoting effect of stirring speed on the polycondensation reaction is greatly reduced in the middle and late stages of polymerization. The effect of the flow pattern with different proportions of shear flow, elongational flow and rotational flow on the polycondensation reaction of PBO was further investigated by comparing three reactors including Couette-Taylor reactor (CTR) with a complete shear flow, PIR with strong shear and elongational flows, and double helical ribbon reactor (DHR) with strong shear and rotational flows. Result shows that the improvement of proportions of rotational flow and elongational flow is beneficial to accelerate the polycondensation reaction of PBO in the middle and late stages of polymerization, especially for the rotational flow.
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 10
·1695
·
IF 5.719
Haodong Wen,Wenning Zhao,Xiuxun Han
Layered perovskite-type semiconductor La2Ti2O7has attracted lots of attention in photocatalytic hydrogen evolution, due to the suitable energy band position for water splitting, high specific surface area, and excellent physicochemical stability. However, the narrow light absorption range and the low separation efficiency of photogenerated carriers limit its photocatalytic activity. Herein, plate-like La2Ti2O7with uniform crystal morphology was synthesized in molten NaCl salt. A p-n heterojunction was then constructed through the in situ hydrothermal growth of p-type Co3O4nanoparticles on the surface of n-type plate-like La2Ti2O7. The effects of Co3O4loading on photocatalytic hydrogen evolution performance were investigated in detail. The results demonstrate that composite Co3O4/La2Ti2O7possesses much better photocatalytic activity than the pure component. The composite photocatalyst with 1 wt% Co3O4exhibits the highest hydrogen evolution rate of 79.73 μmol·g−1·h−1and a good cycling stability. The photoelectrochemistry characterizations illustrate that the improvement of photocatalytic activity is mainly attributed to both the enhanced light absorption from the Co3O4ornament and the rapid separation of photogenerated electron-hole pairs driven by the built-in electric field close to the p-n heterojunction. The results may provide further insights into the design of high-efficiency La2Ti2O7-based heterojunctions for photocatalytic hydrogen evolution.Keywords:photocatalysis;hydrogen evolution;p-n heterojunction;La2Ti2O7;Co3O4
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Acta Metallurgica Sinica-English Letters
·
2022
·Vol. 35
·期 10
·1653-1664
·
IF 3.024
Xie Shenghui,Liao Xiang,Zeng Xierong,Yang Haipeng,He Liang
High-entropy alloys (HEAs) have attracted widespread attention due to their excellent mechanical properties. However, their functional properties arising from the supersaturated solid solution state can be improved. Advanced oxidation processes (AOPs) are considered to be an effective method for decomposing organic pollutants, and HEAs are proposed as effective candidates for AOP catalysts. Currently, several HEAs used for organic pollutant degradation are prepared through mechanical alloying. In this work, FeAlCoNi and FeAlCoNiB Fenton-like catalysts were prepared by single roll melt spinning and subsequent ball milling techniques. We found that the FeAlCoNiB HEA exhibits highly efficient degradation for p -nitrophenol ( p -NP). The degradation efficiency of FeAlCoNiB is 120 times higher than that of FeAlCoNi, which confirms that boron functions effectively during the degradation process. FeAlCoNiB has a better degradation efficiency than pure iron powder and a degradation efficiency comparable to that of the amorphous Fe 78 Si 11 B 11 alloy. Additionally, the degradation efficiency of FeAlCoNiB X increases ( k values from 0.13 to 0.55 min −1 ) when the boron content increases from an X value of 0.25 to 1.25. We speculate that Fe 2 B favors the degradation process and promotes zero-valent iron to decompose organic pollutants through a galvanic cell effect. Possible p -NP degradation pathways are proposed after LC–MS analysis. This study provides a new series of HEA Fenton-like catalysts, which have the potential to be prepared into bulk devices for industrial applications.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2022
·Vol. 26
·期 4
·1051-1065
·
IF 2.747
Guo Yan,Li Zhuang,Wei Yuxi,Zhang Xinxu,Shi Kexin
Polyvinylpyrrolidone (PVP) and graphene (G)-modified iron oxides (Fe 2 O 3 -PVP-G) are prepared by a simple hydrothermal reaction. Their morphology and structure were examined and proved by transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and ultraviolet–visible diffuse reflectance spectroscopy. P-nitrophenol (p-NP) is a usual organic pollutant, which is highly toxic and difficult to decompose. Electrochemical reduction of p-NP is a widely used treatment, but the reduction products are still toxic. In this work, the electrochemical catalytic oxidation of p-NP was achieved on Fe 2 O 3 -PVP-G modified electrodes. Compared to pure Fe 2 O 3 , Fe 2 O 3 -PVP-G shows better catalytic performance, with a current density 10.4 times larger than that from Fe 2 O 3 . Electrochemical results verify that the improvement comes from the promotion of its activity and the favorable enrichment of p-NP with the help of the doped PVP and G. pH experiments indicate that p-NP is oxidized to aliphatic acid, which is non-toxic and environmentally friendly. Due to the protection of organic molecules, Fe 2 O 3 -PVP-G exhibits long-term stabilities on electrochemical oxidation on p-NP with the retention of 88.5% for 15 days. Our results also provide another perspective for studying electrocatalytic performances.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2022
·
IF 2.719
Xinhe Liu,Yong Kang,Yi Wang
In this work, novel visible-light responsive β-Bi 2 O 3 /Ag 2 WO 4 p-n heterojunction photocatalysts were prepared by a simple in situ deposition method and characterized using XRD, FT-IR, SEM, TEM, XPS, UV–vis and PL. The uniform deposition of Ag 2 WO 4 particles on β-Bi 2 O 3 flakes to form heterojunctions, exhibited excellent photocatalytic activity for the degradation of methylene blue (MB) under visible light in 30 min. Compared with pure β-Bi 2 O 3 and Ag 2 WO 4 samples, the kinetic reaction rate constant of MB degradation by β-Bi 2 O 3 /Ag 2 WO 4 was 48.47 times higher than that of β-Bi 2 O 3 , and the degradation rate was as high as 98.8% with good cycling stability.
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2022
·
IF 9.879
Chao-Hua Xue,Ren-Xuan Wei,Xiao-Jing Guo,Bing-Ying Liu,Mi-Mi Du,Meng-Chen Huang,Hui-Gui Li,Shun-Tian Jia
Daytime radiative cooling that cools down an object by reflecting solar light and radiating heat simultaneously is expected to be a promising technology for dissipating heat without any energy consumption. However, radiative cooling materials’ solar reflection and infrared emissivity will be affected by the rain or dust pollution, therefore reducing the cooling performance under outdoor environments. A superhydrophobic radiative cooling composite film with hydrophobic SiO 2 embedded in poly(vinylidene fluoride-co-hexafluoropropene) was proposed via phase separation technology. The SiO 2 particles not only imparted to the film porous micro-nano tier rough structure to enhance the surface hydrophobicity , but also improved the mid-infrared emissivity of the film. As a consequence, the as-prepared film achieved 10.3 °C cooling under direct sunlight with convective heat reduced by transparent polyethylene film, and excellent superhydrophobicity with water contact angle greater than 160° and sliding angle close to 0°. Moreover, the cooling performance and superhydrophobicity of the film changed little after immersion in different pH solution and long-time exposure to UV irradiation. Importantly, the obtained film demonstrated great self-cleaning property making it hardly to be contaminated in outdoor environments, which is significant for sustainable applications.
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 12
·2102549
·
IF 6.389
Jiamin Zhang,Xuzhao He,Suya Lin,Xiaoyi Chen,Lingqing Dong,Jun Lin,Huiming Wang,Wenjian Weng,Kui Cheng
Piezoelectric biomaterials are considered to be able to mimic the electrophysiological microenvironment of natural bone tissue, thus enhancing the bone regeneration. However, the effects of heterogeneous electric potential gradient of piezoelectric biomaterials on their osteogenic performance still remain elusive, largely because of the challenge of harassing the distribution of electric potential gradient on the surface of piezoelectric biomaterials. This study controls the heterogeneous electric potential gradient on the CoFe 2 O 4 /poly(vinylidene fluoride-trifluoroethylene (CFO/P(VDF-TrFE)) membrane by using an alternatively positive–negative polarization processing on microscaled straight-stripe patterned indium tin oxide coated glass (ITO) electrodes. The potential gradient (Δ ζ ) on membranes can be controlled by the stripe width and polarization parameters. Interestingly, Δ ζ shows a significant influence on the cellular osteogenic potential of mesenchymal stem cells (MSCs) and the bone regeneration performance in vivo. The Δ ζ of 0.672 pm/(V*µm) shows the optimal osteogenic performance both in vitro and in vivo, which can be attributed to the boost of integrins α 5 β 1 expression as well as the orientated arrangement and contractility of the cytoskeletons via mechanotransduction signaling cascades. This work therefore shows the importance of heterogeneous electric potential and provides a novel strategy to accelerate the osteogenic performances of piezoelectric biomaterials.
✓ 已验证
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 33
·22831-22837
·
IF 3.9
Bin Li,Wenrui Hao,Aolin Wu,Mengjing Zhou,Qinghua Yan,Heng Zhang,Lihua Su
The present study synthesized a deep eutectic solvent (DES) using acrylic acid (AA), acrylamide (AM), and choline chloride (ChCl), and added phytic acid (PA) as a filler. Subsequently, the PA/P(AA-co-AM) composite hydrogel was prepared under ultraviolet irradiation and used a photoinitiator. Characterization of the hydrogels was conducted using Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The study aimed to investigate the impact of PA on the mechanical properties, fatigue resistance, and electrical conductivity of the composite hydrogel. The findings demonstrated that as the mass fraction of PA increased, the compressive strength of the composite hydrogel gradually decreased, yet the fatigue resistance of the composite hydrogel increased. Specifically, after 10 cycles of compression, the resilience recovery rate of FP0 dropped from 86.9% to 70.4%, the maximum stress recovery rate of FP1 dropped from 97.9% to 89.4%, the maximum stress recovery rate of FP2 dropped from 94.4% to 86.6%, and the maximum stress recovery rate of FP3 dropped from 97.3% to 93%. Overall, this study offers a straightforward and efficient method for producing composite hydrogels with both fatigue resistance and electrical conductivity.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）