JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Yonghong Wang,Xue Bai,Xinru Zhang,Jinping Li
Mixed matrix composite membranes (MMCMs) integrate the merits of inorganic and organic materials, but the tortuous transport passageways bring about large transfer mass resistance for gas transport. Herein, we prepared polyethylenimine-functionalized halloysite nanotubes (PEI-HNTs) by the electrostatic self-assembly of positively charged polyethylenimine and negatively charged halloysite nanotubes . Blending as-obtained PEI-HNTs with polyvinylamine (PVAm), MMCMs were prepared by casting above mixed solution on the top of ultrafiltration polysulfone (PSf) support. PEI-HNTs had good miscibility with PVAm due to hydrogen bonding . MMCMs (1 wt% PEI-HNTs loading) exhibited exceptional separation performance (CO 2 permeance: 179 GPU ; CO 2 /N 2 selectivity: 127.9), respectively, which were 1.4 and 2.3 times that of MMCMs embedding with 1 wt% HNTs. Noticeably, its value was beyond those of MMCMs incorporating with reported hollow tubular filler as well as other shape filler. This is due to the fact that PEI on the surfaces of HNTs provides a lot of amine carriers, which facilitate CO 2 transport. More importantly, the transport passageways are continuous, thus presumably reducing the CO 2 transfer resistance compared to other shape inorganic material filled-MMMs. Besides, resultant MMCMs revealed desirable stability for over 360 h, with a CO 2 /N 2 mixture as feed gas. Remarkably, it maintained superior gas separation performance (CO 2 permeance of 126 GPU; CO 2 /N 2 selectivity of 88.6) under the acidic conditions.
研究领域:
膜科学与技术
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气体分离
·
材料化学
·
高分子材料
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化学工程
·
纳米复合材料
·
环境催化
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2016
·Vol. 23
·期 21
·21369-21376
·
IF 2.76
Xu Like,Qian Yanyun,Su Chao,Cheng Weixiao,Li Jianan,Wahlqvist Mark L.,Chen Hong
The wide use of antibiotics in the animal husbandry and the relevant sustainable industries may promote the emergence of antibiotic-resistant bacteria (ARB), which constitutes a growing threat to human health. The objective of this study was to determine the abundance and diversity of sulfonamide- and tetracycline-resistant bacteria within an eco-agricultural system (EAS) in Hangzhou, China. We investigated samples at every link in the EAS, from livestock manure, to biogas residues and biogas slurry, to vegetable and ryegrass fields, to a fish pond. A combination of culture-based and 16S rRNA gene-based sequencing method was used in this study. Within the studied system, the average rate of bacterial resistance to sulfonamide (46.19 %) was much higher than that of tetracycline (8.51 %) ( p < 0.01). There were 224 isolates that were enumerated and sequenced, 108 of which were identified to species level. The genera comprising the sulfamethoxazole-resistant (SMX r ) bacteria were generally different from those of tetracycline-resistant (TC r ) bacteria. Staphylococcus and Acinetobacter were the most dominant genera of SMX r bacteria (19.30 % of the total resistant bacteria) and TC r bacteria (14.04 % of the total resistant bacteria), respectively. Several strains of resistant opportunistic pathogens (e.g., Pantoea agglomerans ) were detected in edible vegetable samples, which may exert a potential threat to both pig production and human health. In general, this study indicates that the EAS is an important reservoir of antibiotic-resistant bacteria, some of which may be pathogenic.
研究领域:
环境微生物学
·
农业生态学
·
分子生物学
·
公共卫生
·
耐药性监测
·
环境健康
✓ 已验证
DOI
高影响因子
ChemCatChem
·
2016
·Vol. 8
·期 12
·2128-2135
·
IF 4.724
Kui Li,Xin Xie,Wei-De Zhang
A facile strategy to synthesize porous graphitic carbon nitride with stacking nanotubes by thermal condensation of melamine–ammonium oxalate stacking sheets is reported. The photocatalytic generation rate of hydrogen over the porous graphitic carbon nitride (99.7 μmol h −1 ) is nearly 9.5 times as that of pristine g-C 3 N 4 (10.5 μmol h −1 ). Such enhancement is attributed to the large specific surface area (91.1 m 2 g −1 ), improved visible-light absorption and efficient separation of photogenerated electrons and holes. The strategy of preparing the porous graphitic carbon nitride with modified melamine as a precursor opens a new gate for the regulation of the morphologies of g-C 3 N 4 to get higher photocatalytic activity. Graphical Curled up : Porous graphitic carbon nitride nanotubes were prepared by thermal condensation of melamine–ammonium oxalate (MAO) stacking sheets, which display high and stable activity for photocatalytic generation of hydrogen through water splitting.
研究领域:
材料科学
·
光催化
·
纳米材料
·
能源化学
·
半导体催化
·
水裂解制氢
·
功能材料
✓ 已验证
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2013
·Vol. 40
·期 1
·11-22
·
IF 0.88
Zhi Dongyan,Li Xiangye,Xu Shouhong,Liu Honglai
Microparticles with a core–shell structure were synthesized from SiO 2 particles as core and thermally sensitive hyaluronate–poly( N -isopropylacrylamide) (HA–PNIPAM) hydrogel as shell. The SiO 2 –HA–PNIPAM microparticles were injectable at room temperature and assembled to settle on to biosurfaces. Dynamic light-scattering measurements at different temperatures showed that the temperature-dependence of the diameters ( d ) of SiO 2 –HA–PNIPAM microparticles was reversible. d decreased abruptly when the temperature was increased to their lower critical solution temperature of 307 K. The Mw of HA and the extent of modification by glycidyl methacrylate, D
m , had clear effects on the sizes of the microparticles and their thermal sensitivity. Fluorescein, selected as model drug, was encapsulated in the gel shell to study the dynamics of drug release by this microparticle at body temperature.
研究领域:
生物材料学
·
组织工程
·
药物递送系统
·
纳米医学
·
再生医学
·
高分子科学
·
生物医学工程
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DOI
高影响因子
RUSSIAN JOURNAL OF ELECTROCHEMISTRY
·
2024
·Vol. 59
·期 12
·1176-1182
·
IF 1.1
Jianping Zhang,Zhu Yahua,Yin Gengwen,Hou Wenlong,Zhang Haiquan
Perylene diimide radical anions (PDI –• ) prepared by through photoelectric doping are capable of reducing aromatic halides and achieving aromatic hydrocarbon coupling. The active of electrically doped PDI –• is dependent on the conditions of electroreduction (e.g. electrode material), but little attention has been paid to the influence of electrode material, voltage, and electroreduction time on the activity of PDI –• . In this paper, we compared the active of PDI –• produced by different electrode materials, different reduction voltages and different reduction times based on the difference in UV-vis absorption spectra. In contrast to the characteristic absorption spectra of the anion of the PDI –• , the metal electrodes with certain reducing properties, such as zinc and magnesium, stabilize the radical anion and reduce the PDI –• activity due to the generation of positive zinc and magnesium ions during the electroreduction process.
研究领域:
电化学
·
有机合成
·
材料化学
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 5
·1-10
·
IF 5.7
Liu Nianzu,Zhao Shuju,Li Yanxin,Li Mingxuan,Guo Yingshu,Luo Xiliang
A reliable and brief ultralow fouling electrochemical sensing system capable of monitoring targets in complex biological media was constructed and validated based on gold nanoparticles-peptide hydrogel-modified screen-printed electrode. The self-assembled zwitterionic peptide hydrogel was prepared by a newly designed peptide sequence of Phe-Phe-Cys-Cys-(Glu-Lys) 3 with the N-terminal modified with a fluorene methoxycarbonyl group. The thiol groups on cysteine of the designed peptide are able to self-assemble with AuNPs to form a three-dimensional nanonetwork structure, which showed satisfactory antifouling capability in complex biological media (human serum). The developed gold nanoparticles-peptide hydrogel-based electrochemical sensing platform displayed notably sensing properties for dopamine determination, with a wide linear range (from 0.2 nM to 1.9 μM), a low limit of detection (0.12 nM), and an excellent selectivity. This highly sensitive and ultralow fouling electrochemical sensor was fabricated via simple preparation with concise components that avoid the accumulation of layers with single functional material and complex activation processes. This ultralow fouling and highly sensitive strategy based on the gold nanoparticles-peptide hydrogel with a three-dimensional nanonetwork offers a solution to the current situation of various low-fouling sensing systems facing impaired sensitivity and provides a potential path for the practical application of electrochemical sensors. Graphical abstract
研究领域:
电化学
·
纳米技术
·
生物传感器
·
材料科学
·
分析化学
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2024
·Vol. 53
·期 5
·2656-2665
·
IF 2.2
Xiong Shanxin,Zhang Yukun,Zhang Wei,Yang Nana,Lv Fengyan,Guo Jingru,Cui Xin,Fang Ke,Chen Min,Wang Chenxu,Hua Chunxia,Zhang Runlan,Chu Jia,Xu Jianwei
Covalent organic frameworks (COFs) with reversible redox units and a conjugated molecular skeleton possess novel photoelectrochemical properties. In this work, tris(4-aminophenyl)amine and 4,4-biphenyldiformaldehyde were chosen to synthesize TABP-COF electrochromic film with triphenylamine (TPA) active unit by a solvothermal method in a Teflon-lined reactor. The growth process and reaction time optimization of the TABP-COF were studied. TABP-COF shows a self-assembly growth process from an array of nanosheets to nanospheres. Owing to the redox characteristics of TPA, the TABP-COF film exhibits reversible electrochromic behavior. With a solvothermal reaction time of 72 h, the TABP-COF-3 film exhibits the best electrochromic properties, including contrast of 0.483 and response time of 7.3 s/13.6 s. Considering the abundance of redox-active units that can be chosen, COF materials with different redox units and color changes can be designed for a variety of applications in the field of electrochromic materials.
研究领域:
材料科学
·
电化学
·
纳米技术
·
有机化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 20
·8346-8358
·
IF 4.5
Guo Rui,Zhang Yuyu,Wang Lun,Huang Yin,Yuan Rui,Yang Li,Chang Guanjun
Design readily available and inexpensive aerogels as potential sorbent materials for oil–water separation is extremely significant because of the increasing discharge of domestic oil pollution. Hereby, a novel superhydrophobic indole-based hemiaminal aerogel (PCINA) without any post-surface treatment was fabricated by a facile, simple and mild method via sol–gel technology followed by freeze-drying. The as-obtained indole-based hemiaminal aerogel exhibited high absorption capacity for varieties of oils and organic solvents. In addition, the separation efficiency of oil–water mixture was as high as 99.8%, even the separation efficiency of emulsion could achieve to 98.2%. More excitingly, the indole-based hemiaminal aerogel PCINA possessed repeatability and regeneration due to the feasible desorption and rapid degradation, suggesting that the green and renewable aerogel was a promising material for the treatment of oil contaminants in different fields. Graphical abstract
研究领域:
材料科学
·
环境工程
·
化学工程
·
高分子科学
·
绿色化学
✓ 已验证
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2017
·
IF 3.101
Long Mao,Yuejun Liu,Huiqing Wu,Jianhong Chen,Jin Yao
Inspired by the versatile adhesion capability of marine adhesive proteins, core-shell structured polydopamine-coated layered double hydroxide (LDH@PDA) were prepared successfully by in-situ growing PDA on the surface of MgAl-LDH with a high aspect ratio . LDH@PDA/poly(ε-caprolactone) (PCL) nanocomposites were prepared by blending LDH@PDA and pure PCL via solution casting method to obtain homogeneous films. The results of thermal analysis confirmed that LDH@PDA can act as a nucleating agent . And thermal stability of nanocomposites was improved due to core-shell structured LDH@PDA. With incorporation of as low as 1 wt% of LDH@PDA, a 20% increase in tensile strength (41.1 MPa), 26% increase in elongation at break (772%) and 26% reduction in the oxygen relative permeability were achieved. The improvement in the mechanical and gas barrier properties of nanocomposites at low filler loading was attributed to the strong interfacial interaction of LDH@PDA wtih the PCL matrix.
研究领域:
高分子材料
·
纳米复合材料
·
生物医用材料
·
材料科学
·
表面改性
·
气体阻隔
·
力学性能
✓ 已验证
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2017
·
IF 4.164
Zhijia Zhang,Xiaole Zhao,Yingchun Su,Defeng Xing,Xiaojun Han
We demonstrate that antibacterial agent N , N′ -[(4, 5-dihydroxy-1, 2-phenylene)bis(methylene)]bisacrylamide (OHABA) can be assembled on the surface of vinyl organosilicon nanospheres (VOSNs) by atom transfer radical polymerization (ATRP). Chemically cross-linked vinyl organosilicon cores were facilely fabricated by sol-gel method as support, which densely grafted poly-OHABA (POHABA) as shells. Antibacterial assessment test results revealed that POHABA-based core@shell structure displayed high antibacterial performance, long-term stability, and kept broad-spectrum antibacterial effect of against Gram-negative and Gram-positive bacteria.
研究领域:
材料科学
·
纳米医学
·
抗菌材料
·
高分子化学
·
表面功能化
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 9
·794
·
IF 2.8
Li Ji,Xiang Peng,Tan Xinyu,Li Bowen,Zhang Kai,Zhu Ying,Ren Yanqi,Chen Xiaobo
Organic–inorganic lead halide peroxides (OIHPs) have attracted much interest due to their excellent photovoltaic properties, but practical applications are limited by long-term stability and further performance enhancement. Two-dimensional/three-dimensional (2D/3D) heterojunction is a promising strategy to address these issues. Here, short-chain 3,5-dichlorobenzylamine (DBA) with halogen functional groups is introduced to react with excess PbI 2 to form the 2D perovskite layer in mixed perovskite films of Cs 0.05 (FA 0.85 MA 0.15 ) 0.95 Pb(I 0.85 Br 0.15 ) 3 , which passivates surface defects, favours energy band alignment of functional layers and suppresses non-radiative recombination of carriers. As a result, DBA-treated 2D/3D PSCs obtained a champion PCE of 21.54% with an improved open circuit voltage ( V oc ) of 1.171 V. More importantly, the 2D/3D heterojunction can effectively protect the underlying 3D perovskite from moisture ingress. The unencapsulated 2D/3D devices retain 90% of their initial efficiency even after aging at 40 ± 5% RH for 1000 h, while the 3D device retains only 40%.
研究领域:
材料科学
·
光伏技术
·
纳米结构材料
·
表面化学
·
能源材料
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Ruihan Wang,Nanxi Dong,Guofeng Tian,Gang Liu,Bo Zhou,Shengli Qi,Dezhen Wu
In order to allow polyimide (PI) to resist the erosion of atomic oxygen (AO) in Low Earth Orbit to extend the life of the aircraft, an in-situ precursor network approach was proposed to manufacture the inorganic gradient microstructure across the organic/inorganic transition interface and simplify the process, which create a three-tier microstructure film and lead the dense SiO 2 protective layer firmly grasps the PI film. Benefiting from the integrated structure, SiO 2 -coated PI film shows remarkable surface and interface state after 3000 times mechanical bending, which able to delay the initial AO corrosion caused by the defect of the protective layer, resistance to AO reported as AO erosion yield of 2.39 × 10 −26 cm 3 O atom −1 under 7 × 10 21 O atoms cm −2 AO fluence. This work proposes a novel approach for the fabrication of high-performance and AO resistant PI to enable the aircraft to complete more efficient and highly integrated flight missions and shows great potential in the general preparation of organic-inorganic interface.
研究领域:
高分子材料科学
·
航天材料工程
·
表面与界面化学
·
空间环境效应
·
功能涂层技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）