COLLOIDS AND SURFACES B-BIOINTERFACES
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2012
·
IF 3.456
Qin Tu,Jian-Chun Wang,Rui Liu,Juan He,Yanrong Zhang,Shaofei Shen,Juan Xu,Jianjun Liu,Mao-Sen Yuan,Jinyi Wang
A quaternized poly(dimethylaminoethyl methacrylate)-grafted poly(dimethylsiloxane) (PDMS) surface (PDMS-QPDMAEMA) was successfully prepared in this study via solution-phase oxidation reaction and surface-initiated atom transfer radical polymerization (SI-ATRP) using dimethylaminoethyl methacrylate (DMAEMA) as initial monomer. PDMS substrates were first oxidized in H 2 SO 4 /H 2 O 2 solution to transform the Si CH 3 groups on their surfaces into Si OH groups. Subsequently, a surface initiator for ATRP was immobilized onto the PDMS surface, and DMAEMA was then grafted onto the PDMS surface via copper-mediated ATRP. Finally, the tertiary amino groups of PolyDMAEMA (PDMAEMA) were quaternized by ethyl bromide to provide a cationic polymer brush-modified PDMS surface. Various characterization techniques, including contact angle measurements, attenuated total reflection infrared spectroscopy, and X-ray photoelectron spectroscopy, were used to ascertain the successful grafting of the quaternized PDMAEMA brush onto the PDMS surface. Furthermore, the wettability and stability of the PDMS-QPDMAEMA surface were examined by contact angle measurements. Antifouling properties were investigated via protein adsorption, as well as bacterial and cell adhesion studies. The results suggest that the PDMS-QPDMAEMA surface exhibited durable wettability and stability, as well as significant antifouling properties, compared with the native PDMS and PDMS-PDMAEMA surfaces. In addition, our results present possible uses for the PDMS-QPDMAEMA surface as adhesion barriers and antifouling or functional surfaces in PDMS microfluidics-based biomedical applications.
研究领域:
材料科学
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生物医学工程
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高分子化学
✓ 已验证
DOI
高影响因子
RSC Advances
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2015
·Vol. 5
·期 43
·34199-34205
·
IF 3.84
Ren Liu,Junchao Zheng,Zhiquan Li,Jingcheng Liu,Xiaoya Liu
A facile method to prepare surface self-concentration antibacterial coating with contact-killing mechanism was developed. Photo curable quaternary ammonium compound QAC bearing a 16-carbon alkyl chain and a terminal methacrylate was synthesized as reactive antibacterial additive. After UV irradiation, QAC was crosslinked in the soy-based coating matrix. With proper amounts of QAC, the UV cured coatings exhibited good properties such as high glossiness, good hardness and fine adhesion to cherrywood substrates. The self-concentration property of QAC on the cured coating surface, which is beneficial to reserve the physical properties of the bulk materials and to improve the surface antibacterial activity, was confirmed by fluorescence and X-ray photoelectron spectroscopy. Moreover, the introduction of QAC provided the coatings with superhydrophilicity property as well as good anti-fog capacity. The coatings with 8 wt% of QAC (charge density = 8.6 mol cm−2) exhibited almost 100% antibacterial activity against Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli by 5 log reduction. The contact-killing mechanism of coatings was confirmed via the zone of inhibition tests. The straightforward preparation combined with excellent antibacterial property makes the QAC containing coatings quite promising in antibacterial coatings realm and is suitable for industrial-scale manufacturing.
研究领域:
材料科学
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高分子化学
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表面工程
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抗菌材料
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涂层技术
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2018
·
IF 3.141
Yanping Huang,Nianhua Dan,Weihua Dan,Weifeng Zhao,Zhongxiang Bai,Yining Chen,Changkai Yang
The aim of this study was to fabricate a novel bilayered wound dressing with excellent antibacterial performance through electrospinning and in situ cross-linking polymerization. Quaternary ammonium salts ([2-(methacryloyloxy)ethyl] trimethylammonium, MTA) were first polymerized and cross-linked in the presence of polycaprolactone (PCL) to form PCL/PMTA composites. Then, PCL was electrospun as the cytocompatible inner layer that directly contacts the wound, and the PCL/PMTA layer was placed as the outer layer as a defense against bacteria. The PCL/PMTA layer exhibited a hydrophilic surface and showed a strong antibacterial effect on E. coli and S. aureus. All bilayered antimicrobial nanofiber membranes did not release any toxic agents to cells, and the PCL layer exhibited better effects on cell growth. The electrospun bilayered nanofiber membranes are promising candidates for antimicrobial wound dressings.
研究领域:
生物材料学
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组织工程
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纳米医学
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创伤修复
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高分子科学
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抗菌材料
✓ 已验证
DOI
高影响因子
RARE METALS
·
2012
·Vol. 31
·期 5
·512-516
·
IF 0.593
Lian Yuanpei,Zhen Wei,Tai Zhigang,Yang Yaling,Song Jun,Li Zonghao
Cloud point extraction (CPE) with Tergitol TMN-6 was applied for the extraction of trace amounts of palladium (Pd(II)), platinum (Pt(IV)), and gold (Au(III)) in the soil of industrial sewage. Ammonium pyrolysine dithiocarbamate (APDC) was adopted as the chelating agent prior to CPE and then was detected by atomic absorption spectrometry (AAS). Different parameters such as the concentration of surfactants, chelating agent and salt, sample pH, equilibration temperature and time, centrifugation time and rates, and the effect of foreign ions were studied. Under optimum conditions, the low limits of detections are 1.4, 2.8 and 1.2 ng·ml −1 and the enrichment factors are 21, 12, and 24 for Pd(II), Pt(IV), and Au(III), respectively. The relative standard deviations vary from 0.6% to 1.0% ( n =11). All correlation coefficients of the calibration curves are >0.9960. The proposed method was successfully applied for the determination of Pd(II), Pt(IV), and Au(III) in the real soil of industrial sewage samples.
研究领域:
分析化学
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环境化学
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重金属检测
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分离科学
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环境监测
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry Letters
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2020
·
IF 6.71
Lei Meng,Chen He,Wei Ji,Fei Yen
We observe sharp step-down discontinuities in the magnetic susceptibility of NH4H2PO4 and NH4H2PO4-d60 (60% deuterated) along the a- and c-axes occurring exactly at their antiferroelectric transition temperatures. For the case of KH2PO4, less pronounced discontinuities occur at the ferroelectric transition temperature. To explain this, we treat the acid protons as individual oscillators that generate current elements that translate to magnetic forces in near resonance with each other. With decreasing temperature, the resonant forces become more commensurate, which amplifies a disproportionate drop off of two types of magnetic forces to eventually trigger the structural phase transitions. For the case of NH4H2PO4, the associated internal magnetic field appears to aid the NH4+ to order at a higher temperature. At 49 K, a shoulder-like anomaly in both NH4H2PO4 and KH2PO4 is attributed to a possible onset of macroscopic quantum tunneling of protons. Our findings bring forth a new category of intrinsic multiferroic systems.
研究领域:
凝聚态物理
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材料科学
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固态物理
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磁学
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铁电学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yachao Wang,Yi Li,Qinglei Zhang,Xiangui Shang,Dongdong Yang,Ran Shi,Junqiang Zhao,Luqing Zhang,Yiping Zhao,Li Chen
Developing anti-fouling loose nanofiltration membranes (LNMs) that can achieve dye desalination of saline textile wastewater through dye retention and salt permeation for resource utilization remains an urgent challenge that needs to be addressed. Inspired by the biomimetic adhesion of mussels and the excellent fouling resistance of saltwater fish surfaces, novel LNMs were prepared through co-deposition strategy using dopamine (DA) and N -oxide zwitterionic polyethyleneimine (ZPEI) as biomimetic functional materials. There are multiple interactions between them, including Schiff base reaction, Michael addition reaction, cation-π interaction and covalent polymerization. Compared with PEI-LNM prepared under the similar method, the optimized ZPEI-LNM displays more uniform surface, smaller average roughness (6 nm vs 22 nm), and denser pore size (0.69 nm vs 0.79 nm), indicating the zwitterionic N -oxide moieties in ZPEI regulate the deposition process and the cross-linking structure of the selective layer. ZPEI-LNM exhibits a high pure water flux of 203.0 L m −2 h −1 under 0.6 MPa. Importantly, ZPEI-LNM shows high retention towards different dyes, including Congo red (CR, negative, 696.8 g/mol) of 100.0 %, Acid fuchsin (AF, negative, 585.5 g/mol) of 99.5 %, Crystalline violet (CV, positive, 408.0 g/mol) of 98.2 %, and Indigo carmine (negative, 466.4 g/mol) of 96.0 %, while the rejection of NaCl (8.7 %) and Na 2 SO 4 (12.7 %) are both lower. As expected, for the mixture solution of AF/NaCl, the dyes are efficiently rejected, while salts can pass through, indicating that ZPEI-LNM displays an excellent dye desalination capability. Furthermore, multiple-cycle antifouling tests for bovine serum albumin (BSA) and sodium alginate (SA) reveal that the flux recovery ratios are higher than those of PEI-LNM (BSA: 90.4 % vs 81.9 %; SA: 86.6 % vs 80.5 %), indicating ZPEI-LNM exhibits better anti-fouling performance towards different model foulants owing to the outstanding hydration layer caused by zwitterionic N -oxide moieties and lower surface roughness. Consequently, the work offers a new viewpoint for the fabrication of anti-fouling LNMs via biomimetic strategy for dye desalination.
研究领域:
材料科学
·
环境工程
·
生物仿生学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Yulong Wang,Yue Liu,Ya Xu,Congqiang Zhang,Huaxi Bao,Jia Wang,Zhiguang Guo,Li Wan,Dominik Eder,Shimin Wang
Methylammonium bismuth iodide ((CH 3 NH 3 ) 3 Bi 2 I 9 , MBI) is a promising alternative to perovskite solar cells (PSCs) due to its air stability and low-toxicity. Herein, a two-stage electric-field-assisted reactive deposition method has been introduced to prepare MBI films for the first time. PSCs based on MBI films were fabricated and characterized. The influences of electric parameters (applied voltage mode, pulse and time, etc.) on the morphology and crystal structure of MBI film correlated with the photovoltaic performance of PSCs have also been investigated systematically in detail. Through adjusting the voltage mode, crystal growth can be completely controlled, leading to a compact MBI film with large grain size. Moreover, the MBI film prepared by electrochemical deposition required no annealing. This work determined that the optimal performance of PSCs is based on the MBI film deposited by square-wave (AC) voltage mode (−7.3 V/+1 V, 5 Hz, 5 min). All devices exhibited long-term stability in ambient air (humidity of >50%) for more than 300 h. This study will inspire further research on the application of electrochemical deposition technique for other lead-free PSCs.
研究领域:
材料科学
·
能源技术
·
光伏器件
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Dongsheng Fu,Yuanzheng Ding,Ruijie Guo,Jie Zhang,Huifang Wang,Baolong Niu,Hong Yan
ZIF-8, a subclass of metal organic frameworks (MOFs), was employed as the CuO carriers because of its high surface areas and good dispersibility. A novel antibacterial agent CuO@ZIF-8 was synthesized by environmentally-friendly direct calcination strategy, and introduced into the composite double-layer films for packing materials. The double-layer films were prepared via solution casting method with polylactic acid (PLA) and polyvinyl alcohol (PVA)-quaternary ammonium chitosan as the matrix of outer layer and inner layer, respectively; and CuO@ZIF-8 nanoparticles were introduced into the PVA-quaternary ammonium chitosan layer. The double-layer films exhibited superior antibacterial activity resulted from the uniform dispersion of CuO by ZIF-8 carriers. The elongation at break was enhanced and up to 17.13%, about 2.4-fold that of PLA films. Meanwhile, the films provided low water vapor permeability and strong UV-barrier ability which were attributed to the lay-by-layer casting, CuO@ZIF-8 doping and TiO 2 addition. Cherry tomato preservation experiment revealed that the composite films retarded the growth of harmful microorganisms on the fruit surface. MTT assay confirmed the cytocompatibility of the films. The easily fabricated double-layer films presented potential possibility in the field of biodegradable food packaging.
研究领域:
材料科学
·
食品科学
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高分子化学
·
包装工程
·
农业工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2018
·
IF 4.513
Sheng-Jin Li,Lu Lai,Ping Mei,Yan Li,Li Cheng,Zhao-Hua Ren,Yi Liu
The interaction behavior and the process of mixed micellization for binary mixtures of bisquaternary ammonium salt (BQAS) and sodium dodecyl sulfate (SDS) were investigated using the surface tensionmeter, and the synergistic properties of these mixtures were evaluated. The interaction parameters and thermodynamic parameters of BQAS/SDS mixtures were calculated based on the regular solution theory. Moreover, the dynamic surface tension curves of these mixtures were examined using bubble profile analysis method, and the corresponding kinetic parameters were obtained. Results indicate that the critical micelle concentrations of the BQAS: SDS mixtures with the molar ratios of 3:7, 5:5, and 7:3 are 4.0 × 10 −5 mol/L, 5.0 × 10 −5 mol/L and 6.0 × 10 −5 mol/L, respectively, which are two orders of magnitude lower than that of either component. Despite the mixing ratios vary from 3:7 to 7:3, these mixtures have almost equal surface tensions. Consequently, the component of adsorption layer is dominated by the catanionic surfactant complexes, rather than the mixing ratios in the bulk phase. The interaction parameters β σ and β m of binary systems with the BQAS: SDS molar ratios of 5:5 are −18.11 and −15.56, respectively, indicating the strong synergistic effects in the reduction of surface tension and the formation of micelle . The thermodynamic parameters suggest that the formation of micelles is an exothermic and entropy increase process. Moreover, results of dynamic surface tension indicate that the BQAS/SDS mixtures exhibit a faster adsorption process than either pure component, resulting from the enhanced hydrophobicity of catanionic surfactant complexes. In addition, the initial stage of adsorption of BQAS/SDS mixtures exhibits a mixed kinetic-diffusion mechanism.
研究领域:
胶体化学
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表面化学
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物理化学
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溶液热力学
·
界面动力学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Xiaomeng Chu,Haoxi Zhang,Cuizhi Zhang,Runan Shao,Zitong Huang,Hongfu Lv,Shaojie Liu,Lei Liu,Nanwen Li,Song Zhao
Selecting appropriate polymer backbones is crucial for the advancement of anion exchange membranes (AEMs) that exhibit both high ionic conductivity and robust chemical stability. In this study, we synthesized rigid and chemically inert aryl-ether-free polyphenylene-based polymer backbones containing alkaline-resistant N-cyclic cations, i.e. dimethyl piperidinium (DMP) or 6-azonia-spiro[5.5]undecane (ASU), as high-performance AEMs. The procedure encompassed several key steps: superacid-catalyzed Friedel-Crafts polycondensation, bromomethylation, azidation, and Cu(I)-mediated azide-alkyne cycloaddition. The synthesized BP-ASU(DMP)-x copolymers demonstrated excellent film-forming capabilities to afford robust AEMs as compared to polyolefin-based counterparts. Owing to the significant incompatibility between the hydrophobic backbones and the hydrophilic cations, the BP-ASU(DMP)-x membranes exhibited a well-defined microphase-separated morphology, resulting in exceptionally high hydroxide conductivity, up to 157.2 mS cm −1 at 80 °C in water. More importantly, BP-ASU-150 membrane exhibited no chemical degradation and a conductivity retention of >97 % when immersed in 1 M NaOH solution at 80 °C for 4000 h. Compared to the poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) and polyolefin-based counterparts, the achieved outstanding alkaline stability is related to aryl-ether-free polyphenylene and alkali-stable N-cyclic cations, highlighting the importance of polymer backbones for AEM materials. Finally, all the polyphenylene-based AEMs with incorporated N-cyclic cations were assembled in single H 2 /O 2 AEMFCs, with the BP-ASU-150 membrane demonstrating a peak power density (PPD) of 860.4 mW cm −2 at a current density of 1363 mA cm −2 . We concluded that the BP-ASU(DMP) AEMs demonstrated superior performance across various metrics due to exceptional stability and robustness of polyphenylene polymers, highlighting their potential as backbones for high-performance AEM materials.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2014
·
IF 2.822
Fu Liu,Bi-rong Ma,Dong Zhou,Li-Jing Zhu,Yin-Yi Fu,Li-xin Xue
A novel positively charged loose nanofiltration (NF) membrane was fabricated feasibly by UV-induced photografting polymerization of diallyl dimethyl ammonium chloride (DADMAC) on Polysulfone ultrafiltration membrane. A possible reaction mechanism was proposed that a linear chain structure and/or pyrrole like five-membered nitrogen heterocycles structure on the side chain were grafted to form the active barrier layer. NF membrane demonstrated a looser average pore size of 8.6 nm and positive charges surface. Owing to the nanoscale ultrathin nanoscale barrier layer and the combination of Donnan exclusion and steric hindrance , NF membrane exhibited good hydrophilicity , a high pure flux of 60 L/m 2 h (0.5 MPa), a good salt rejection to Mg 2+ (90.8%), Al 3+ (94.0%), Ca 2+ (91.5%), and a high dye rejection to methylene blue (99.4%) and congo red (100.0%) respectively. The salts rejection of NF membrane to different salts followed the order of AlCl 3 > CaCl 2 > MgCl 2 > NaCl > LiCl > MgSO 4 > Na 2 SO 4. NF membrane showed certain fouling resistance to seawater and BSA solution. The grafting polymerization kinetics were comprehensively investigated including irradiation time, monomer concentration and irradiation intensity. X-ray Photoelectron Spectroscopy (XPS), scanning electron microscopy (SEM), atomic force microscopy (AFM) and contact angle measurement were employed to investigate membrane chemistry, morphologies, and hydrophilicity.
研究领域:
材料科学
·
环境工程
·
膜分离技术
·
高分子化学
·
水处理
✓ 已验证
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2018
·Vol. 13
·期 1
·59-69
·
IF 2.643
Yang Dongjie,Wang Shengyu,Zhong Ruisheng,Liu Weifeng,Qiu Xueqing
A simple method using a water soluble lignin quaternary ammonium salt (LQAS) and TiO 2 has been developed for the preparation of lignin/TiO 2 nanocomposites in an aqueous medium under mild conditions. The LQAS/TiO 2 nanocomposites contain well-dispersed small particles with excellent ultraviolet (UV) shielding abilities and good compatibilities with waterborne polyurethane (WPU). When the LQAS/TiO 2 nanocomposites were blended with WPU, the UV absorbance and the tensile ductility of the WPU increased significantly. The composite WPU hybrid film containing 6 wt-% LQAS/TiO 2 nanocomposite had the highest visible light transmittance and had excellent ultraviolet aging properties. After 192 h of UV light irradiation, the tensile strength of the composite film was above 8 MPa and the elongation at break was 800%. This work highlights new possibilities for the utilization of alkali lignin.
研究领域:
高分子材料
·
纳米复合材料
·
表面涂层技术
·
紫外线防护
·
绿色化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）