共查询到20条相似文献,搜索用时 15 毫秒
1.
Morelli S Piscioneri A Salerno S Tasselli F Di Vito A Giusi G Canonaco M Drioli E De Bartolo L 《Journal of materials science. Materials in medicine》2012,23(1):149-156
This study focuses on the development of an advanced in vitro biohybrid culture model system based on the use of hollow fibre
membranes (HFMs) and hippocampal neurons in order to promote the formation of a high density neuronal network. Polyacrylonitrile
(PAN) and modified polyetheretherketone (PEEK-WC) membranes were prepared in hollow fibre configuration. The morphological
and metabolic behaviour of hippocampal neurons cultured on PAN HF membranes were compared with those cultured on PEEK-WC HF.
The differences of cell behaviour between HFMs were evidenced by the morphometric analysis in terms of axon length and also
by the investigation of metabolic activity in terms of neurotrophin secretion. These findings suggested that PAN HFMs induced
the in vitro reconstruction of very highly functional and complex neuronal networks. Thus, these biomaterials could potentially
be used for the in vitro realization of a functional hippocampal tissue analogue for the study of neurobiological functions
and/or neurodegenerative diseases. 相似文献
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Polyacrylonitrile (PAN) ultrafiltration (UF) membranes were modified by plasma treatments and plasma polymerization. Influences of plasma modifications on membrane characteristics were investigated. The obtained results indicated that plasma treatments using non-polymer-forming plasma gases such as Ar, He and O2 led to the increase of membrane surface hydrophilicity and membrane permeability. By using O2 plasma treatment, UF property of PAN membranes could be improved with the enhancement of membrane flux meanwhile its albumin rejection was almost maintained. The experimental results also showed that plasma polymerization using acrylic acid vapor as monomer and PAN UF membrane as a substrate led to the formation of reverse osmosis membrane due to the deposition of plasma polymer layer onto substrate membrane surfaces. Plasma techniques can control membrane pore size and have a potential to improve the membrane characteristics by using their advantages. 相似文献
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聚丙烯腈(PAN)具有较高的气体渗透性,但拉伸强度低,不适宜直接制膜。为达到气体分离膜在力学强度方面的使用要求,利用PAN与乙酸纤维素(CA)共混改善其拉伸性能。结果表明,采用相转化法制备的PAN/CA共混基膜,随着CA与PAN共混比的增加,拉伸强度有明显的上升趋势,由1.74MPa增加到2.08MPa。当共混比为0.... 相似文献
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以二甲基亚砜为前驱体制备插层高岭石(K-DMSO),通过原位聚合制备聚丙烯腈(PAN)与K-DMSO的复合物,利用静电纺丝技术制备PAN/K-DMSO复合纤维膜。采用XRD,FTIR,TEM和TGA研究PAN/K-DMSO复合物的微观形态和热性能,并采用SEM,POM和拉伸试验机对其纤维膜的形貌和拉伸强度进行测试表征。结果表明:PAN/KDMSO中含有高岭石的内外羟基峰,表征层间距的d001值随PAN进入高岭石的层间而增大,部分高岭石被剥离形成厚度为2~5nm的片层结构分散在PAN基体中。K-DMSO的加入使PAN的耐热性提高,PAN纤维膜的直径减小,拉伸强度增加。PAN与K-DMSO的质量比为8∶1时,PAN/K-DMSO纤维膜的拉伸强度与PAN相比,在未处理,冷压和热处理的情况下分别提高了0.92,1.73MPa和1.96MPa。 相似文献
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先用Fenton试剂(过氧化氢/硫酸亚铁)对多壁碳纳米管进行改性处理(-fMWCNTs),再通过水相悬浮聚合法制备了多壁碳纳米管/聚丙烯腈(-fMWCNTs/PAN)复合微球,用静电纺丝技术制备了-fMWCNTs/PAN复合纤维膜。通过扫描电镜(SEM)、热重分析仪(TGA)和万能试验机研究了-fMWCNTs对电纺纤维... 相似文献
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High Efficiency Poly(acrylonitrile) Electrospun Nanofiber Membranes for Airborne Nanomaterials Filtration
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Riyadh Al‐Attabi Ludovic F. Dumée Lingxue Kong Jürg A. Schütz Yosry Morsi 《Advanced Engineering Materials》2018,20(1)
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采用静电纺丝法,以聚偏氟乙烯(PVDF)和聚丙烯腈(PAN)为基体,通过改变ZrO_2的含量,制备了ZrO_2/PVDF-PAN复合纤维膜。用SEM和比表面积测试仪(BET)分别对复合纤维膜的形貌和比表面积进行了表征。结果表明:纳米ZrO_2的加入量对ZrO_2/PVDF-PAN复合纤维膜的形貌有较大影响,随着纳米ZrO_2含量的增加,纤维表面变得凹凸不平,提高了纤维膜的比表面积,进而提高了纤维膜的吸液率,且当ZrO_2含量为PVDF和PAN总质量的0.4%时达到最大值。将复合纤维膜组装成超级电容器,利用电化学工作站对其循环伏安(CV)和交流阻抗(EIS)性能进行测试,研究了ZrO_2的加入对复合纤维膜电化学性能的影响。结果表明:ZrO_2的加入提高了ZrO_2/PVDF-PAN复合纤维膜的电导率,当ZrO_2含量为0.4%时其电化学综合性能最好,其中比容量达126.0F/g,离子电导率为9.31×10~(-3) S/cm。 相似文献
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Multilayer composite membranes with high removal capability for metal ion were prepared using electrostatic self-assembly
(ESA) technique. Especially, self-assembled multilayer of chitosan microspheres and PAA were formed onto charged surface of
polyacrylonitrile (PAN) membranes. It was confirmed that the alternate multilayer of chitosan and PAA were deposited on the
base membrane surface. The formation of the ESA layer-by-layer of chitosan/PAA or chitosan microspheres/PAA onto the base
membrane surface functionally equipped the membrane with removal capability for Cu2+. Especially, membranes with chitosan microspheres/PAA ESA layers on the surface showed relatively higher adsorption capability
as compared with membranes with chitosan/PAA ESA layers. Besides, the influence of the pH of metal ion solution on the metal
ion adsorption property of ESA modified membrane was investigated. It was proposed that the layer-by-layer self-assembled
deposition of chitosan microspheres would be a new approach to functionalize membrane with high adsorption capability for
metal ions. 相似文献
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为了寻求低价、环保的电镀废水处理方案,将廉价的聚丙烯腈(PAN)纤维与羟胺试剂反应对PAN纤维进行改性,使其上氰基螯合获得偕胺肟基纤维。通过改变各种改性条件,探讨了改性条件对PAN改性纤维在重金属单离子溶液和多离子混合溶液中吸附性能的影响。结果表明:最佳改性条件为21.2 g/L PAN纤维,27.0 g/L盐酸羟胺,pH值为7.0,70℃下反应2 h;改性PAN纤维对模拟电镀废水中的Cu2+,Zn2+,Ni2+,Pb2+,Cd2+等重金属离子均有较好吸附性能,其中对Cd2+吸附效果最好,吸附量为55 mg/g;在多离子混合溶液中优先选择吸附Cd2+;改性PAN纤维再生效果优良,可重复利用。 相似文献
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聚丙烯腈/醋酸纤维素共混超滤膜的研制与改性 总被引:12,自引:1,他引:11
研究了聚丙烯腈 /二醋酸纤维素 (PAN/CA)共混超滤膜的性能与聚合物共混比、聚合物质量分数等的关系 .结果表明 ,加有氯化锂 (LiCl)的二甲基乙酰胺 (DMAC)是PAN/CA共混体系的良溶剂 .当聚合物的质量分数为 14 % ,PAN/CA共混比为 5 0 / 5 0时 ,所制得的共混超滤膜的性能较好 .对共混超滤膜进行水解改性的实验发现 :膜的截留率上升 ,水通量下降 .用酱油、药酒为料液的超滤实验表明 :共混膜和水解改性膜的耐污染性能优于聚丙烯腈 (PAN)、聚砜 (PS)和磺化聚砜 (SPS)膜 相似文献
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Nanowires of poly-cobalt[tetrakis(o-aminophenyl)porphyrin] (PCoTAPPNW) were fabricated by electrochemical polymerization by the cyclic voltammetric method in anodic aluminum oxide membranes. A glassy carbon electrode (GCE) modified by PCoTAPPNW and single-walled carbon nanotubes (SWNT) without any binder was investigated with voltammetric methods in phosphate buffer saline (PBS) at pH 7.4. The PCoTAPPNW + SWNT/GCE exhibited strongly enhanced voltammetric and amperometric sensitivity towards hydrogen peroxide (H2O2), which shortened the response time (< 5 seconds), showed detection limit of 1.0 microM and enhanced the sensitivity for H2O2 detection with 194 microA mM(-1) cm(-2). The PCoTAPPNW + SWNT/GCE can be used to monitor H2O2 at very low concentration in physiological pH as an efficient electrochemical H2O2 sensor. 相似文献
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为节省预氧化进程的能耗和时间并优化聚丙烯腈(PAN)预氧纤维的性能,用H2O2改性PAN原丝,使其提前环化。采用FTIR、XPS等方法表征不同处理温度获得的未改性和改性PAN原丝。结果表明:H2O2水溶液在60℃改性PAN原丝时,H2O2可引发氰基环化,末端环发生亚胺、烯胺互变异构,由此出现亚氰基、类芳香伯胺;改性温度越高,改性PAN原丝的亚氰基含量、共轭程度越大。在模拟稳定化过程中,改性PAN原丝的类芳香伯胺可在较低温度下引发相邻氰基环化。使用氨水(NH3H2O)作为助剂获得改性PAN原丝,与未改性PAN原丝经历相同的预氧化进程,改性后的PAN原丝能在较短时间内达到适合的预氧化程度,且PAN预氧纤维径向结构的均匀性被改善,由此获得热稳定性更高的PAN预氧纤维。 相似文献
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采用静电纺丝技术制备聚丙烯腈/醋酸纤维素(PAN/CA)纳米纤维膜,通过化学改性制备偕胺肟化聚丙烯腈/再生纤维素(AOPAN/RC)纳米纤维膜,研究了纳米纤维膜对单一金属离子(Fe~(3+))和混合金属离子(Cu~(2+)、Cd~(2+)、Fe~(3+))的吸附性能。通过扫描电镜、红外光谱、X射线能谱仪等测试对纳米纤维膜进行了表征,并通过静态接触角测定纳米纤维膜亲水性能。研究表明,改性后制备的AOPAN/RC纳米纤维膜的亲水性能得到较大改善,同时纳米纤维膜能够高效吸附溶液中的金属离子,纳米纤维膜对单一组分Fe~(3+)的饱和吸附可达411.21mg/g,对于混合金属离子溶液,纳米纤维膜对其吸附能力顺序为Fe~(3+)Cu~(2+)Cd~(2+),而且纳米纤维膜具备优良的重复使用能力。 相似文献
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A novel intercalation nanocomposite based on polyacrylonitrile (PAN)/kaolinite was prepared by a simple in situ emulsion polymerization in the presence of organically modified layered silicates (kaolinite). The crude kaolinite (K0) was firstly modified by dimethylsulfoxide-methanol and potassium acetate-aqueous systems; acrylonitrile monomer was then intercalated into kaolinite by displacing potassium acetate from KAc-kaolinite (the kaolinite modified by KAc, marked as K2). The polymer/kaolinite composites were prepared by in situ emulsion polymerization, and characterized by means of X-ray diffraction, scanning electron microscope, transmission electron microscope and thermal gravimetric analysis. Experimental results indicate that the clay layers of kaolinite in PAN/K2 composites are well distributed and delaminated. The weight-average molecular weights were measured by small-angle X-ray scattering for all samples. The presence of clay results in an increase in molecular weights compared to pure PAN polymer due to the highly crosslinked structure. 相似文献
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利用有机溶剂去除PAN基炭纤维表面的集束剂与染剂.然后通过乙炔热裂解沉积对其进行表面改性,以期获得兼具高机械强度和优良导电性的高性能PAN基炭纤维.采用SEM、AFM、XRD、Raman等方法对PAN基炭纤维在改性前后的微观结构、结晶性、抗拉强度、弹性模量、导电性等进行了分析.研究结果表明采用化学气相沉积法可以提高或者明显改善石墨化处理后的PAN基炭纤维的力学性能(抗拉强度为2GPa,弹性模量为270GPa)和导电性(5×10-4Ω·cm). 相似文献
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The polyacrylonitrile (PAN) fibers were modified with hydroxylamine and its mixture with hydrazine to prepared the amidoximated PAN fibers (denoted as AO-PAN) and mixing modified PAN fibers (denoted as M-PAN) respectively, and then both of which were reacted with Fe3+ ions to form two modified PAN fiber–Fe complexes (denoted as Fe–AO-PAN for AO-PAN and Fe–M-PAN for M-PAN). Their mechanical properties were evaluated and compared with respect to the breaking strength and elongation at break in both dry and wet conditions, and two important effecting factors including weight gain rate of the PAN fiber after modification and Fe content remained in the PAN fiber were investigated. Besides, thermal behavior of the modified PAN fibers and their Fe complexes was also examined by DSC and DMA methods. The results indicated that higher weight gain rate imparts the reduced breaking strength to two modified PAN fibers, and which is found to be further lower in wet state. The mechanical properties of the modified PAN fibers-Fe complexes, especially Fe–AO-PAN varied with Fe content (CFe–PAN). Moreover, two critical CFe–PAN values are observed to be 79.75 mg/g for Fe–AO-PAN and 28.35 mg/g for Fe–M-PAN, respectively, at which they show a minimum values of breaking strength and elongation at break. Also, Fe–AO-PAN is much higher than Fe–M-PAN in terms of the critical CFe–PAN value, which is mainly attributed to the difference in molecular structure between them. Thermal behavior of the modified PAN fibers and their Fe complexes is also greatly affected by their modification methods. 相似文献
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采用溶液相转化法制备了聚氯乙烯(PVC)/聚丙烯腈(PAN)共混膜,研究了(PVC)/(PAN)共混体系的相容性,并通过红外光谱(FT-IR)、扫描电子显微镜(SEM)等对PAN水解前后共混膜结构、形貌和性能进行了表征与分析。结果表明,(PVC)/(PAN)为部分相容体系,在成膜过程中产生明显界面微孔结构;共混膜中的PAN发生水解后,生成大量酰胺、羧酸、羧酸盐等亲水基团,改善了共混膜的亲水性(膜的水接触角从87.48°降低到65.12°),提高了共混膜的通透性(膜的纯水通量从84.17 L/(m2.h)升高到343.7 L/(m2.h))。 相似文献