CHEMOSPHERE
·
2020
·
IF 5.778
Yahui Shi,Dongjin Wan,Jinhui Huang,Yongde Liu,Jinsong Li
The development of visible light-responsive photocatalytic membranes (vis-PMs) has opened a promising direction in water purification field. Herein, supramolecular aggregates from cyanuric acid (C), melamine (M), and urea (U) in dimethyl sulfoxide (DMSO) were used to prepare the porous carbon nitride nanosheet (MCU-C 3 N 4 ) with excellent photocatalytic performance. A sort of 3D heterostructure PMs consisting of MCU-C 3 N 4 and carbon nanotube (CNTs) interposed into graphene oxide (GO) on the PVDF membrane was firstly fabricated by the layer-by-layer (LbL) assembly method, in which CNTs/MCU-C 3 N 4 /GO material was immobilized on the polyelectrolytes (PE) modified PVDF based on their electrostatic attractions. Such PMs with abundant nano-channels had excellent mechanical strength, satisfactory water permeability (14.35 L m −2 h −1 bar −1 ) and synergetic removal efficiency of rhodamine B (RhB, 98.31%) in long -term operation, relative to the pristine GO membrane and MCU-C 3 N 4 /GO membrane fabricated by the same method. In addition, such PMs also exhibited the satisfactory tetracycline hydrochloride (TC) removal rate (84.81%) under visible light irradiation. Construction and performance of such carbon-based PMs might provide guidance for development of vis-PMs in terms of bonding strength, multidimensional morphology and water purification application.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 28
·14819-14827
·
IF 8.867
Zhen Lin,Qiugen Zhang,Yan Qu,Mengmeng Chen,Faizal Soyekwo,Chenxiao Lin,Aimei Zhu,Qinglin Liu
Polyelectrolyte membranes provide a highly promising platform for an efficient and sustainable nanofiltration (NF) process. The challenge is to prepare polyelectrolyte NF membranes with high permeation. Herein, we report a novel strategy to fabricate a polyelectrolyte membrane via a layer-by-layer (LBL) self-assembly technique with a Ni(OH)2 nanosheet sacrificial layer for a fast NF process. The sacrificial layer helps to deposit a LBL assembled polyelectrolyte layer directly on a microfiltration (MF) substrate and thus results in the formation of a membrane with tiny filtration resistance. Meanwhile, the surface charges and thickness of the membranes can be adjusted facilely by the number of assembled layers. The resultant membranes show excellent NF performances with a high water flux of up to 466 L m−2 h−1 bar−1, perfect rejection for organic dye molecules and moderate salt rejection (88.2% MgSO4). Typically, the 570 nm-thick membrane has the water flux of 198 L m−2 h−1 bar−1, 98% rejection for dyes (Mw 373.9) and 81.3% rejection for MgCl2. Furthermore, the membrane has a good rejection and anti-fouling ability for organic molecules with similar charges. The newly developed strategy has wide application in the fabrication of highly permeable polyelectrolyte membranes.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2015
·
IF 3.071
Lili Zhao,Bingbing Yuan,Yiran Geng,Chunan Yu,Nam Hoon Kim,Joong Hee Lee,Peng Li
In this study, layer-by-layer self-assembly of polyethyleneimine (PEI)/graphene oxide (GO) was successfully controlled by an applied electric field. The influences of the applied electric field direction, voltage, and dipping time on the hydrogen barrier properties of PEI/GO self-assembled film were investigated. Ultraviolet–visible light absorption spectroscopy , ellipsometry, atomic force microscopy , and scanning electron microscopy were used to analyze the effects of the electric field on the growth, nanostructure , and micromorphology of the self-assembled film. Results indicated that an applied electric field accelerates the adsorption rate of assembly and increases the GO adsorption quantity. Additionally, such electric field modifies the composite structure of the self-assembled film and spreads out the GO sheets uniformly on the substrate, which results in the formation of a more compact and ordered gas barrier layer with significantly improved hydrogen barrier properties. Higher applied voltage results in a more noticeable field effect. Under 25 V, the hydrogen transmission rate of the PEI/GO self-assembled 10-layer film reached 81 cm 3 /m 2 24 h 0.1 MPa, which was 65% lower than that of standard composite films prepared without using an electric field.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 4
·2699-2709
·
IF 6.123
Cui Yifan,Zheng Guolin,Jiang Zhe,Zhou Yu,Wang Qiang,Zhou Man,Wang Ping,Yu Yuanyuan
The development and improvement of fabric-based stretchable strain sensors play a vital role in constructing wearable devices. In this paper, a flexible and sensitive cotton-based strain sensor for human motion monitoring was successfully developed by facile LBL-ESA (layer-by-layer electrostatic self-assembly) of chitosan (or chitosan quaternary ammonium salt) and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate), abbreviated to PEDOT:PSS. Chemical structure and microscopic morphology of the cotton fabric coated with PEDOT:PSS were measured using X-ray photoelectron spectroscopy, Raman spectroscopy, Scanning electron micrographs, Fourier transform infrared spectrometer and color strength (K/S value). Electrical conductivity of the fabric changed with the “odd–even” oscillations of K/S value of the cotton fabric. Furthermore, cotton fabric alternately deposited with five cycles reached the highest electrical conductivity (0.335 mS/cm). Meanwhile, the fabric presents excellent UV protection capacity (maximum UPF value of 385.07), which was 24.4 times of pristine cotton fabric (15.76). In addition, cotton fabric strain sensor coated by PEDOT:PSS could effectively detect finger and knee movements of humans, showing a promising prospect in the field of human rehabilitation training, real-time monitoring, and gesture recognition due to its good stability and being highly responsive.
研究领域:
材料科学
·
纺织工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2022
·
IF 5.907
Houmei You,Kewei Zhang,Xiangkun Zhang,Huiping Ding,Yiwen Shen,Yongjun Feng,Jinpeng Hou,WeiliangTian
Quantum dots luminescent films have great potential for application in lasers, optoelectronics , solid-state light-emitting diodes, and optical devices. This work describes multilayer ordered vermiculite-based luminescent thin films (VLFs) with 2D architecture via layer-by-layer assembly of PDDA-modified CdTe QDs on exfoliated vermiculite (VMT). The assembly of negative CdTe QDs and negative VMT was achieved, overcoming the nonluminance of solid CdTe QDs. The ordered VLFs possess periodic layered structures involving heterogeneous superlattices associated with individual VMT layers. The rational combination of luminescent components affords precise control of the emission wavelength and intensity, resulting in a gradual change in luminescence intensity in the selected light-emitting spectral region upon increasing the number of deposition cycles. Compared to the CdTe QDs, the fluorescence lifetime of VLFs is improved owing to the ordered structure. This work provides a facile approach to fabricate heterogeneous VLFs with high luminous properties and optical stability, which is expected to prevent easy aggregation of luminescent materials and can be potentially applied in light displays and multicolor optical and optoelectronic devices .
研究领域:
材料科学
·
光电子学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Biomaterials Advances
·
2022
·
IF 0
Haozheng Wang,Lei Cui,Ying Luo,Xiaoyong Zhou,Rui Liu,Qianbing Chen,Ying Guan,Yongjun Zhang
Single-injection vaccines may overcome issues, such as high cost and poor patient compliance, of the multi-bolus regimes dominantly used in vaccination. However no such vaccine has been commercialized because time-controlled release, an unconventional release kinetics, is difficult to achieve. Here a new time-controlled release system using dynamic layer-by-layer (LBL) film as erodible coating was used to design single-injection vaccine. Unlike commonly used degradable polymers, dynamic LBL film disintegrates at a constant rate, thus allowing distinct pulsatile release of antigen at predetermined intervals. The release pattern of the single-injection vaccine mimics closely to that of ordinary multi-dose regimes. It elicits both humoral and cellular immune responses which are comparable to or even stronger than the corresponding multi-dose regime. In addition, it inhibits tumor growth more effectively. The new vaccine will not only improve patient compliance but also therapeutic outcome.
研究领域:
药学
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生物技术
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免疫学
·
疫苗学
✓ 已验证
产品关联
DOI
PubMed
Bioactive Materials
·
2023
·
IF 18.9
Xiaoli Jia,Chao Hua,Fengbo Yang,Xiaoxiao Li,Peng Zhao,Feifan Zhou,Yichi Lu,Hao Liang,Malcolm Xing,Guozhong Lyu
Current hemostatic agents or dressings are not efficient under extremely hot and cold environments due to deterioration of active ingredients, water evaporation and ice crystal growth. To address these challenges, we engineered a biocompatible hemostatic system with thermoregulatory properties for harsh conditions by combining the asymmetric wetting nano-silica aerogel coated-gauze ( [email protected] ) with a layer-by-layer (LBL) structure. Our [email protected] was a dressing with a tunable wettability prepared by spraying the hydrophobic nano-silica aerogel onto the gauze from different distances. The hemostatic time and blood loss of the [email protected] were 5.1 and 6.9 times lower than normal gauze in rat's injured femoral artery model. Moreover, the modified gauze was torn off after hemostasis without rebleeding, approximately 23.8 times of peak peeling force lower than normal gauze. For the LBL structure, consisting of the nano-silica aerogel layer and a n -octadecane phase change material layer, in both hot (70 °C) and cold (−27 °C) environments, exhibited dual-functional thermal management and maintained a stable internal temperature. We further verified our composite presented superior blood coagulation effect in extreme environments due to the LBL structure, the pro-coagulant properties of nano-silica aerogel and unidirectional fluid pumping of [email protected] Our work, therefore, shows great hemostasis potential under normal and extreme temperature environments.
研究领域:
材料科学
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生物医学工程
·
伤口愈合
·
温度调节
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2019
·Vol. 140
·期 2
·591-602
·
IF 2.471
Chen Hua-Qi,Xu Ying-Jun,Jiang Zhi-Ming,Jin Xing,Liu Yun,Zhang Lin,Zhang Chuan-Jie,Yan Chao
In order to improve the flame retardancy of knitted cotton fabrics and investigate the flame-retardant mechanism of the system formed by ammonium polyphosphate (APP) and chitosan (CS), flame-retardant knitted cotton fabrics coated with APP and CS were successfully prepared by layer by layer assembly. APP and CS formed the intumescent flame-retardant system, in which CS acted as the carbon source agent and APP acted as both the acid source and foaming agent. The surface micromorphologies before and after flaming of coated knitted cotton fabrics were exploited by scanning electron microscopy. The flammability, combustion behaviors, thermal degradation properties and flame-retardant mechanism of this system were investigated by vertical burning test, cone calorimetry test and thermogravimetric analysis coupled with Fourier transform infrared analysis in N 2 atmosphere, respectively. Compared with the control sample, the deposition of APP and CS endowed the knitted cotton fabrics with improved flame retardancy, higher residual chars, lower heat release rate and total heat release, while increased the smoke production. Improved flame-retardant behaviors are attributed to the thermally stable residual chars, more release of inflammable gases and potential free radical scavengers (PO·) in the gaseous products, named the combination of the condensed-phase and gaseous-phase flame-retardant mechanism.
研究领域:
材料科学
·
纺织工程
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 22
·4994
·
IF 4.967
Mingjia Kang,Silu Chen,Rongjie Yang,Dinghua Li,Wenchao Zhang
An eco-friendly clay-based synergistic flame-retardant coating was established on cotton fabrics via facile layer-by-layer assembly derived from polyethyleneimine (PEI), attapulgite clay (ATP), and phytic acid (PA). The fabricated flame-retardant (FR) cotton fabrics demonstrated improved thermal stability. Compared to untreated cotton fabrics, the limiting oxygen index of Cotton-8TL was improved to 27.0%. The peak heat release rates of the prepared FR cotton fabrics were lower than that of the pristine cotton fabrics, showing a maximum reduction of 41%. The deposition coating system improved the amount of char residue effectively. The intumescent flame-retardant mechanism was proposed through the analysis of char residue and the suppression properties of volatile gases. Furthermore, compared with those of the untreated cotton fabrics, the tensile strength and elongation at break of the FR cotton fabrics in the warp direction were improved by 20% and 47% remarkably, respectively. A feasible surface modification strategy was provided for the flame-retardant treatment of cotton fabrics with the improvement of mechanical properties.Keywords:intumescent flame retardants;clay-based materials;cotton;layer by layer assembly;mechanical property
研究领域:
材料科学
·
纺织工程
·
阻燃性
✓ 已验证
DOI
PubMed
高影响因子
Materials
·
2019
·Vol. 13
·期 1
·111
·
IF 2.972
Xia Zhao,Shuai Yuan,Zuquan Jin,Binbin Zhang,Nazhen Liu,Shibo Chen,Shuan Liu,Xiaolin Sun,Jizhou Duan
Given their outstanding versatile properties, multilayered anticorrosion coatings have drawn great interest from researchers in the academic and engineering fields. However, the application of multilayered coatings is restricted by some limitations such as low interlayer compatibilities, the harsh preparation process, etc. This work introduced a composite film fabricated on a 2A12 aluminum alloy surface, including an anodic oxide film, a sol–gel film, and a layer-by-layer (LBL) self-assembling film from bottom to top. The microstructure and elemental characterization indicated that the finish of the coating with the LBL film resulted in a closely connected multilayered coating with a smoother surface. The anticorrosion performance was systematically evaluated in the simulated corrosive medium and neutral salt spray environment. The integrated coating with the LBL film presented an excellent anticorrosion ability with system impedance over 108Ω·cm2and a self-corrosion current density two orders of magnitude lower than that of the other coatings. After the acceleration test in a salt spray environment, the multilayered coatings could still show a good protective performance with almost no cracks and no penetration of chloride ions. It is believed that the as-constructed multilayered coating with high corrosive properties and a fine surface state will have promising applications in the field of anticorrosion engineering.Keywords:multilayer;corrosion;impedance;layer-by-layer
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2020
·
IF 4.032
Ping Li,Chang Liu,Ying-Jun Xu,Zhi-Ming Jiang,Yun Liu,Ping Zhu
Bio-based materials have been noticed for the continuous environmental pollution and resource shortage. In this paper, lignosulfonate (LS) and chitosan (CS) were selected to be flame-retardants. In the vertical flame test (VFT), LS/cotton-17.1 wt%, CS/LS/cotton-17.0 wt%, and CS/LS/cotton-25.2 wt% obtained lower afterflame times than that of uncoated cotton fabrics, while LS/cotton-17.1 wt% had serious afterglow time of 70 s. However, the afterglow time of CS/LS/cotton-25.2 wt% was 11 s, which decreased owing to the increased amount of CS. LS/cotton-17.1 wt%, CS/LS/cotton-17.0 wt%, and CS/LS/cotton-25.2 wt% presented limiting oxygen index values of 24.7%, 25.0%, and 26.0%, respectively. The scanning electron microscope images of char residues after the VFT showed that CS and LS formed an intumescent flame-retardant system, and cotton fibers remained intact structure. Meanwhile, the results of thermogravimetric analysis suggested that flame-retardant cotton fabrics can generate stable char residues. In N 2 atmosphere, CS/LS/cotton-25.2 wt% generated 27.1% stable char residues. Moreover, the addition of CS/LS decreased the heat release rate and total heat release values and this system performed well in smoke suppression. The flame-retardant mechanism of the system might belong to gas-phased because more non-combustible products were generated in the thermal degradation process.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2022
·
IF 5.907
Xiaohua Tian,Sujun Tian,Lulu Wang,Yanping Yang,Ruilong Zhang,Jiangdong Dai,Jianming Pan
The easy preparation of robust superwetting materials for oily wastewater disposal still remains a challenge. Inspired by the self-cleaning and mechanical properties of natural nacre underwater, herein, we have successfully developed sphere-rod quaternary artificial nacre-inspired meshes (named GO-PEI-SiO 2 -Hal) via interfacial self-assembly using 2D graphene oxide nanosheets , hyperbranched polyethyleneimine, SiO 2 nanospheres , and hollow halloysite nanotubes (Hal) as the building blocks. The nacre-like “brick-and-mortar” layered microstructure was successfully formed and tightly coated to the mesh, showing excellent mechanical properties with Young's modulus up to 19.7 ± 2.6 GPa. Compared to the ternary structures, the quaternary sphere-rod morphology improved the surface roughness , and these four organic/inorganic building blocks are all hydrophilic , which together resulted in the superhydrophilic and underwater superoleophobic characteristics. The effects of building block concentration, dipping number, and mesh size on wettability and oil-water separation performance were studied in detail. The optimal (GO-PEI-SiO 2 -Hal-1) 15 @Fe 300 mesh showed an underwater oil contact angle of 159 o for 1,2-dichloroethane, low oil adhesion, and excellent separation efficiency up to 99.8% at an ultrahigh flux up to 195,038 L m −2 h −1 . This nacre-like mesh exhibited excellent salt tolerance, acid-alkali resistance, recycling ability, and mechanical properties for practical oily wastewater treatment .
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）