COMPOSITES SCIENCE AND TECHNOLOGY
·
2020
·
IF 7.094
Taoqing Huang,Yongwei Li,Min Chen,Limin Wu
Hexagonal boron nitride (h-BN), as a high thermal conductive filler , has been widely used to construct thermal transport network in polymers. However, anisotropic thermal property of BN and its conventional thermal conductive network usually lead to high thermal conductivity in one direction that limits the overall heat dissipation effect. Herein, we report a novel radially aligned three-dimensional boron nitride nanosheets/epoxy composite for thermal interface materials via radial freeze-casting method. The as-prepared composite with radially aligned boron nitride nanosheets lamellae exhibits bidirectional high thermal conductivity , with 4.02 W m −1 K −1 in the through-plane direction and 3.87 W m −1 K −1 in the in-plane direction even at low BNNS loading (e.g., 15 vol%), respectively. Besides, excellent electronic insulation property and shape stability can also meet the requirements of isotropic TIM in thermal management.
研究领域:
材料科学
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热管理技术
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MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2021
·Vol. 223
·期 8
·2100338
·
IF 2.527
Chao Qu,Hongzhang Zhang,Changsheng Wang,Xianfeng Li
A membrane with low vanadium ion permeability and excellent electrochemical stability is crucial for a vanadium flow battery (VFB). Herein, a highly stable anion exchange membrane based on a bi-guanidinium crosslinking quaternized poly(arylene ether sulfone) (PSF) is reported. The positively charged guanidinium groups can not only form continuous and smooth ion transport channels but also prevent the mutual penetration of vanadium electrolyte at positive and negative sides, respectively, based on the Donnan exclusion effect. Moreover, the crosslinking structure endows the membrane high mechanical strength to meet the requirements of the harsh environment of VFBs. As a result, the anion exchange membrane fabricated by the poly(arylene ether sulfone) crosslinked with bi-guanidinium (BG-PSF) shows an impressive VFB performance with a coulombic efficiency of 99.8% and an energy efficiency of above 85.8% at a current density of 80 mA cm −2 , which is much higher than that of Nafion115. Furthermore, this battery can continuously work for over 200 cycles at a current density of 80 mA cm −2 , indicating good stability of the membrane. Therefore, the rationally designed BG-PSFs are promising for VFB applications.
研究领域:
材料科学
·
能源技术
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2019
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IF 3.973
Meifei Lian,Binbin Sun,Zhiguang Qiao,Kai Zhao,Xiaojun Zhou,Qianqian Zhang,Duohong Zou,Chuanglong He,Xiuyin Zhang
Guided bone regeneration (GBR) membranes have the potential to prevent the invasion of epithelial and connective tissues as well as to maintain a stable space for facilitating the ingrowth of regenerative bone tissue. However, the bioactivity and regeneration potential of currently available membranes still need to be improved. In this study, a novel bi-layered membrane with both osteogenic and antibacterial functions was developed for GBR applications. The loose layer (LL) of the membrane was composed of conjugated electrospun poly (lactic-co-glycolic acid) (PLGA)/gelatin nanofibers incorporating dexamethasone-loaded mesoporous silica nanoparticles ( [email protected] ), while the dense layer (DL) of the membrane consisted of traditionally electrospun PLGA nanofibers loaded with the broad-spectrum antibiotic doxycycline hyclate (DCH). Morphological results showed that the LL ( [email protected] /PLGA/Gel) membrane exhibited a porous and loosely packed structure, which was beneficial for cell adhesion and infiltration, while the DL (DCH/PLGA) membrane remained dense enough to act as a barrier. In vitro drug release tests indicated that both DEX and DCH followed a favorable sustained release profile. The cell viability evaluation suggested that the electrospun membranes possessed good cytocompatibility. Furthermore, in vitro osteogenesis analyses demonstrated that the [email protected] /PLGA/Gel composite membrane possessed an enhanced osteoinductive capacity for rat bone marrow stem cells (BMSCs), which was verified by the increased alkaline phosphatase (ALP) activity, the enhanced calcium deposition, and the upregulated osteocalcin (OCN) expression. In vitro antimicrobial experiments revealed the effective antibacterial potency of the DCH/PLGA membrane. In conclusion, the prepared nanocarrier-incorporated bi-layered composite membrane with combined osteogenic and antibacterial properties may be a promising candidate for GBR application.
研究领域:
生物材料
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组织工程
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再生医学
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药学
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材料科学
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DOI
PubMed
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2021
·Vol. 127
·期 2
·79
·
IF 2.584
Xue Lisha,Shen Weixia,Zhang Zhuangfei,Fang Chao,Zhang Yuewen,Jia Xiaopeng
Motivated by prototypes that the heavy-element doping can effectively tune carrier and phonon transport behavior, we studied the influence of Bi doping on the thermoelectric properties of Cu 2 Se synthesized by high-pressure and high-temperature technique. With the increased Bi contents, the carrier mobility of Bi x Cu 2 Se samples distinctly decreased, while the Seebeck coefficient and electrical resistivity increased. The Bi x Cu 2 Se samples exhibited multiple microstructures including abundant grain boundaries, micropores and lattice defects. Various phonon scattering mechanisms generated relatively low lattice thermal conductivity below 0.55 Wm −1 K −1 for all Cu 2 Se-based samples. The lattice thermal conductivity of Cu 2 Se-based samples increased after Bi doping due to reduced degree of disorder of Cu + ions, which weakened phonon scattering. Due to the significantly reduced thermal conductivity, a peak zT value of 1.57 at 873 K was obtained for Bi 0.005 Cu 2 Se sample, which was 25% higher than that of pristine Cu 2 Se (zT ~ 1.25). This work indicates the potential of heavy-element doping in boosting performance for liquid-like thermoelectrics.
研究领域:
材料科学
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热电材料
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高压合成
·
固体物理
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Ruiheng Li,Wenxin Ou,Jianglong Zhu,Qian Deng,Xiaobo Tan,Qi Zhao,Tianbo Lu,Shaojingya Gao,Huangshui Ma,Hao Wu,Qiang Sun,Ran Ang
The emerging fields of the Internet of Things, intelligent robotics, and smart biomedical devices have sparked an increasing demand for high-performance thermoelectric (TE) devices due to their efficient conversion of thermal energy into electrical power, and vice versa. The environmentally friendly (Bi, Sb) 2 Te 3 (BST) system, which displays superior performance near room temperature, offers a promising solution for optimizing thermoelectrics to meet the needs of commercial applications. Here, we utilized AgInSe 2 alloying to enhance the TE and mechanical properties of BST, aiming to optimize electron and phonon transport and elucidate the underlying mechanisms. The synergistic optimization resulted in a peak zT of ∼ 1.3 at 353 K and an average zT ave of ∼ 1.11 from 303 K to 503 K in BST-0.1 %AgInSe 2 , as well as a high Vickers hardness of ∼ 105 H v. Through rational optimization of the TE device, we achieved a maximum conversion efficiency of ∼ 6 % at a temperature difference of 210 K. Leveraging the robust TE output of the device, we further evaluated its potential as a self-powered information interaction wristband device based on ASCII codes. We envisage this versatile TE device being extensively applied in power generation and human–machine interaction, with promising potential in wearable electronics, telecommunications, and healthcare monitoring.
研究领域:
材料科学
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热电学
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能量转换
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可穿戴技术
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力学性能
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高影响因子
Desalination and Water Treatment
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2024
·
IF 1
Wenquan Sun,Biao Ma,Yongjun Sun,Huaili Zheng,Genchao Ma
In this work, the degradation of tetracycline (TC) in wastewater was investigated using the γ-Al 2 O 3 – Bi–(Sn/Sb) particle electrodes. Parameters affecting the degradation efficiency and energy consumption of the γ-Al 2 O 3 –Bi–(Sn/Sb) particle electrodes, such as electrical conductivity, initial pH, air flow, current intensity, plate distance, filling ratio, and initial wastewater concentration, were systematically investigated. Results showed that the optimal conditions were 4000 mS·cm - 1 conductivity, pH 6, 15 mL·min - 1 air flow, 0.1 A current intensity, 4 cm plate distance, 0.05 g·mL - 1 filling ratio, and 100 mg·L -1 wastewater concentration. More than 90% and 70% of TC and total organic carbon were degraded, respectively, under the optimal conditions. In addition, the γ-Al 2 O 3 –Bi–(Sn/Sb) particle electrodes had good stability and reproducibility.
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高影响因子
WEAR
·
2016
·
IF 2.323
Z.C. Lu,M.Q. Zeng,J.Q. Xing,M. Zhu
The wear and friction behavior of Pb-free Cu–Sn–Bi bearing alloys were improved by adding multi-layer graphene (MLG). An MLG/CuSn 5 Bi 5 composite was produced by combining ball milling and conventional powder sintering. The composite exhibited increased bulk hardness and improved distribution and refinement of the Bi phase. Addition of MLG to the CuSn 5 Bi 5 matrix resulted in a significant decrease in the friction coefficient and wear volume. Both adhesive and delamination wear were reduced at a certain MLG content. Despite an increase in the hardness, friction and wear improvements were caused by easy shear of the self-lubricating MLG in the contact interface, a decrease in the peeling of the brittle Bi phase, and the transport and spread of the Bi phase via slippage of the laminated MLG platelets on the worn surface. The self-organizing MLG/Bi nanocomposite tribolayer that forms is proposed to act as a lubricant and to improve the wear behavior significantly.
研究领域:
材料科学
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摩擦学
·
金属基复合材料
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机械工程
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高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Yutong Duan,Xianjia Peng,Xingyun Hu
Vanadium is a kind of heavy metal pollutant listed as priority control by various countries, but it is also a strategic valuable metal. The current treatment of vanadium-containing wastewater suffers from the waste of vanadium resources and produces large volumes of hazardous wastes . An innovative approach was proposed to address these problems. The method involved selectively recovering vanadium from wastewater using Bi 2 O 3 and preparing Bi-V photocatalyst in situ. By optimizing the conditions, the recovery efficiency of pentavalent vanadium (V(V)) was 99.6%. The recovered product was determined to be 1.14*Bi 2 O 3 @BiVO 4 , and it was proved to be a heterojunction structure by transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The band gap was calculated to be 2.32 eV by UV–vis analysis. Under visible light, the degradation rate and efficiency of AO7 by 1.14*Bi 2 O 3 @BiVO 4 was 0.906 h −1 and 84.86%, respectively. The degradation pathway of AO7 was also revealed. The improved photocatalytic performance of the Bi 2 O 3 @BiVO 4 could be attributed to the p-n heterojunction, excitating ·O 2 − and ·OH under visible light. Thus, this method solved the problem of both vanadium discharge in wastewater and the difficulty of vanadium resource utilization, and had practical utilization value.
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高影响因子
OPTICS AND LASERS IN ENGINEERING
·
2023
·
IF 4.6
Yongping Li,Ziyi Luo,Yiwan Song,Xiaoyu Weng,Yiping Wang,Liwei Liu,Jun Song,Junle Qu,Xiao Peng,Yufeng Yuan
Recently two-dimensional (2D) nanomaterials-mediated photothermal therapy (PTT) has become an important tool for treating cancer. However, visually monitoring the localization of nanoagents in cancer cells remains a key challenge. Herein, exploring high photostability, and high biocompatibility probes for monitoring PTT are still highly desirable. In this study, a novel optical probe named PEG@ReSe 2 nanosheets (polyethylene glycol, PEG; rhenium diselenide, ReSe 2 ) was prepared and employed to perform in vivo two-photon imaging for monitoring PTT in esophageal cancer cells. Under the illumination of a near-infrared (NIR) femtosecond laser at 820 nm with the output power as low as 5 mW, the PEG@ReSe 2 nanosheets showed significant two-photon features, producing a significant photoluminescence emission band at 637 nm. In addition, the prepared PEG@ReSe 2 nanosheets exhibited high resistance to photobleaching. Also, the PEG@ReSe 2 nanosheets showed low cytotoxicity for cancer cells, providing a high viability of more than 90%. More importantly, the PEG@ReSe 2 nanosheets could enter cancer cells and work as a two-photon probe for visually displaying the PTT process. After 12 h incubation, the PEG@ReSe 2 nanosheets produced strong two-photon signals in KYSE150 cancer cells, enabling them to perform in vivo bi-channel bioimaging. In light of its photothermal effects, the PEG@ReSe 2 nanosheets also could serve as a sensor for monitoring PTT under low-power infrared laser irradiation. This study suggests that, the PEG@ReSe 2 nanosheets could serve as a superior two-photon biosensor for monitoring the PTT process in cancer nanomedicine.
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Surfaces and Interfaces
·
2023
·
IF 6.2
Yue Shen,Haoyang Xu,Yage Zheng,Yao Wang,Liang Zhang,Zhiqiang Zhang,Lvling Zhong,Zhixian He
The development of a low-cost and recyclable method for wastewater treatment has been a major challenge. Polyvinylidene fluoride (PVDF) membranes have received considerable attention owing to their excellent mechanical strength , unique antioxidant properties, and low cost. In this study, Bi/BiOCOOH/PVDF composite membrane materials were prepared using a simple two-step solvent thermal method and phase conversion method. The results showed that under the synergistic action of adsorption and photocatalysis , the photocatalytic degradation efficiency of Bi/BiOCOOH composite material and Bi/BiOCOOH/PVDF composite membrane material for ciprofloxacin (CIP) was much higher than that of BiOCOOH. The introduction of PVDF acted as a carrier, improved the adsorption of the catalytic material to CIP, and facilitated the effective collision of the photocatalytic active site and CIP. The experimental results and theoretical calculations confirmed that the combination of Bi and BiOCOOH effectively improved the light absorption capacity and photocatalytic performance. The reproducibility test revealed that the small amount of new composite catalyst for Bi/BiOCOOH/PVDF as a carrier was lost and that the Bi/BiOCOOH/PVDF catalyst still had high catalytic activity. In addition, the influence of water matrix factors, such as pH and anion, on the photocatalytic degradation experiment was investigated, which would provide some reference for the actual wastewater treatment of the composite catalyst. This study demonstrates a photocatalytic activation mechanism between metals and semiconductors and provides some basis for constructing catalysts for the synergistic and effective treatment of water pollution through a combined adsorption and photocatalysis process.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Dongcheng Bai,Zhengtao Wei,Xueqing Qiu,Xuliang Lin
Organic contaminants have become a major concern in current environmental policies. Biochar is often used to absorb pollutants due to its large surface area, wide availability, and cost-effectiveness. Lignin, a byproduct of the pulp and paper industry, is an ideal precursor for biochar due to its abundance, sustainability, and high carbon content. Bi-activation engineering of alkali lignin during the carbonized process by combining potassium carbonate and melamine to produce porous carbon with more micro–mesoporous structure was proposed. Melamine reacts with the carbon matrix during the activation process, creating new alkaline compounds and releasing more gas, resulting in the formation of more micropores and mesopores. Adjusting the ratio of potassium carbonate to melamine can optimize the micro–mesoporous structure of porous carbon materials. In this regard, a nitrogen-doped three-dimensional porous carbon (ALNC-2-1) with a specific surface area of up to 3522 m2 g–1 was synthesized for the adsorption of methylene blue and tetracycline hydrochloride in wastewater; the largest adsorption capacities were 1364 and 1682 mg g–1, respectively. The adsorption process was found to follow the pseudo-second-order kinetic model and was attributed to electrostatic interaction, pore filling, hydrogen bonding, and π–π interaction. Moreover, ALNC demonstrated high removal rates for organic pollutants and excellent regeneration performance, thus making it a promising material for practical wastewater treatment.
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Shiyu Sun,Xin Huang,Jingtao Bi,Na Wang,Ting Wang,Lina Zhou,Li Wang,Shyam Lamichhane,Hongxun Hao
Titanate has been used to absorb heavy metal ions in wastewater. However, the selective adsorption driven by ion recognition remains a challenging task. In this paper, bidirectional layer spacing regulated titanate nanofilms were developed and the mechanism of layer spacing enhanced ion recognition was systematically studied. TEM, SEM, XRD, XPS, FTIR and BET were used to characterize and analyze the obtained titanate nanofilms, and the results showed that the adsorbent was successfully synthesized and the layer spacing of these nanofilms can be bidirectionally regulated. The adsorption kinetics and adsorption isotherm indicated a positive correlation between the layer spacing of titanate nanofilms and the ion recognition. DFT calculations and Bader program analysis were used to investigate the adsorption process of titanate nanofilms with different layer spacing. It can be concluded that the affinity between adsorbent and specific adsorbate and the electron transfer value on the titanate surface could be regulated by changing the layer spacing of titanate nanofilms, resulting in the enhanced ion recognition performance. Finally, an ion recognition mechanism was proposed based on the above experimental and calculative results.
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