电活性聚乳酸纳纤膜的形态调控及高效捕集PM0.3性能

通过静电喷雾沸石咪唑框架-8(ZIF-8)分散液对同步电纺聚乳酸(PLA)纳米纤维进行表面功能化,以增强PLA/ZIF-8纳米纤维膜(简称纳纤膜)表面的电荷俘获及储存能力,从而提高静电吸附效果和过滤性能.通过在分散液中添加不同量的ZIF-8来调控锚定于纤维表面的ZIF-8负载量,探究ZIF-8含量与纤维膜形态和性能演变之间关系.采用扫描电子显微镜(SEM)对纤维膜的微观形态进行表征,并结合傅里叶变换红外光谱(FTIR)和X射线衍射谱(XRD)分析了纤维膜的化学性质、界面相互作用和晶体结构的演变机理.采用静电测试仪、电介质测试仪和静电计分别评价表面电势、相对介电常数和输出电压,表征纤维膜的电活性和摩擦电输出性能.通过万能试验机测试聚乳酸纳米纤维膜的力学性能,并使用自主搭建的空气过滤测试平台探究纤维膜高效过滤机理.结果表明,PLA/ZIF-8纳纤膜具有高电活性、高过滤效率、低空气阻力和优异的力学性能:其表面电势和最大开路输出电压分别可达5.9 kV和30.9 V,与纯PLA对比样相比分别提升5.6倍和5.3倍,同时拉伸强度和拉伸韧性增幅分别高达78%和111%.更重要的是,PLA/ZIF-...     

氨基官能化聚乳酸电纺纤维的制备、 表征和应用

通过聚乳酸(PLA)和氨基丙基三乙氧基硅烷(KH550)混合进行静电纺丝制备氨基官能化聚乳酸纳米纤维. 采用滴定法测定了纤维表面氨基含量, 证明当KH550的添加量为3%~13%(质量分数)时, 有19%~26%的氨基出现在纤维的表面. 利用场发射扫描电子显微镜、 差示扫描量热(DSC)仪、 接触角测试仪和电子拉伸机对纤维形貌、 PLA的玻璃化转变温度和熔点以及纤维膜的亲水性和力学性能进行了表征. 结果表明, KH550的加入可以在电纺纤维表面引入氨基, 同时使纤维直径变细, 使PLA的玻璃化转变温度上升, 熔点下降, 电纺纤维膜的亲水性略有增加, 力学性能有所下降. 通过吸附将金纳米粒子负载到氨基官能化聚乳酸电纺纤维膜上, 得到负载型催化剂, 对硼氢化钠还原对硝基苯酚的反应具有良好的催化活性和重复使用性.     

聚偏氟乙烯电纺膜及其电化学性能的研究

用电纺的方法制备了聚偏氟乙烯纳米纤维膜,它们具有多微孔结构,能够作为锂电池聚合物电解质.电纺中聚合物溶液的浓度对制备的电纺膜的结构形态有很大的影响,低浓度(10 wt%)时得到珠丝结构的膜,浓度15 wt%时则为纤维结构,而高浓度(18 wt%)时,电纺膜为交联的网状结构.用电纺法制备的聚偏氟乙烯纳米纤维微孔膜具有较高的孔隙率,而且它们与锂金属电极具有良好的界面稳定性;在25℃时吸液率最高可达340%,以这种膜制备的聚合物电解质室温电导率可达到1.57×10-3S.cm-1;由该电解质组装的扣式电池以0.5 mA.cm-2恒流充放电,25℃时50次循环后几乎无容量损失,具有良好的循环性能;即使60℃时,电池仍能保持良好的工作稳定性.     

PLLA/β-TCP杂化微纳米纤维的制备及其性能

将湿法工艺合成的β-磷酸钙纳米粒子与左旋聚乳酸(PLLA)的混合溶液通过电纺丝法制成杂化纳米纤维膜,以期制备一种新型纳米纤维骨组织修复材料。采用FT-IR,XRD,TEM,DSC等手段研究了β-磷酸钙(β-TCP)的结构和形态,采用SEM和直径分布探讨了优化PLLA/β-TCP纤维的电纺丝工艺。结果表明:采用湿法合成β-TCP的纳米粒子具有良好的晶型结构,直径在219~328 nm之间;采用双溶剂体系在优化条件下制备的PLLA/β-TCP杂化纳米纤维直径在500~700 nm之间,PLLA/β-TCP界面结合良好,β-TCP起到了增强作用。在湿态条件下,PLLA纤维膜的力学性能有所提高,而PLLA/β-TCP纤维膜的力学性能则呈现下降趋势。     

聚(丙交酯-co-乙交酯)/β-磷酸三钙复合物的电纺研究

对生物可吸收聚(丙交酯-co-乙交酯)(poly(lactide-co-glycolide),PLGA)与β-磷酸三钙(-βTCP)复合物体系进行了电纺.研究了PLGA的浓度,-βTCP与PLGA比例,加料速度,电压,喷头与接收体之间的距离等因素对电纺过程的影响,制备出纳米纤维膜,并用扫描电镜(SEM)等对纤维膜进行表征.结果表明,电纺溶液浓度越高,或者加料速度越快,纳米纤维的直径越粗.力学实验显示,复合物中-βTCP的含量增加使纳米纤维膜的拉伸强度和杨氏模量下降.     

金纳米棒负载的静电纺丝纤维的制备及其表面增强拉曼光谱性能

为简单有效地制备高活性表面增强拉曼光谱(Surface-enhanced Raman Spectroscopy,SERS)基底。本文采用静电纺丝聚乙烯醇(PVA)/聚丙烯酸(PAA)纳米纤维为支撑材料,通过直接浸泡的方法,利用金纳米棒与电纺纤维之间的静电力,使纳米棒在纤维表面自组装,得到了性能优异的SERS基底。通过透射电子显微镜、扫描电子显微镜对金纳米棒以及不同状态下的电纺纤维的形貌进行表征,结果表明,金纳米棒均匀且密集地负载在纤维表面。通过设置不同的浸泡时间确定了金纳米棒组装平衡的时间为12 h,并通过调控纺丝时间和金纳米棒的浓度发现随着纺丝时间和金纳米棒浓度的增加,复合纤维膜SERS增强效果随之提升。该复合纤维膜具有优异的SERS均匀性,并且能够检测到浓度低至10~(-10)mol/L的4-氨基苯硫酚的存在。     

具有抗菌性能的载药复合微纳米纤维的制备及其结构和性能表征

利用静电纺丝技术制备了一种具有抗菌性能的氧化锌(ZnO)/聚乳酸(PLA)/聚己内酯(PCL)载药微纳米纤维膜,并通过扫描电子显微镜(SEM)、X射线衍射(XRD)和傅里叶变换红外光谱(FTIR)分别对复合膜的表面形态、元素组成和化学结构进行表征。通过抗菌实验评价了复合膜的抗菌性能,用紫外分光光度计测试复合膜在体外的药物释放行为。结果显示,以物理共混的方式将ZnO和氢溴酸高乌甲素(LAH)成功载入复合微纳米纤维;与PLA/PCL复合微纳米纤维膜相比,ZnO/PLA/PCL复合微纳米纤维膜表现出更好的抗菌效率。当ZnO含量为10%(wt)时,复合微纳米纤维膜具有最佳的抗菌性能;药物释放性能结果表明,ZnO/PLA/PCL复合微纳米纤维膜具有良好的药物缓释性能。     

原位交联明胶电纺纤维的制备工艺研究

提出一种原位交联工艺,用于一步制备交联明胶电纺纤维膜,克服目前该电纺膜交联工艺繁琐以及交联过程破坏纤维形态等缺点.通过一系列实验,找出明胶-三氟乙醇-戊二醛三元溶液体系的稳定电纺条件.所得的纤维直径在1μm左右,远大于单纺明胶的纤维直径.同时发现,在电纺过程中,由于纤维表面戊二醛迅速挥发,使得纤维形成"伪核壳"结构.利用流变仪对三元溶液交联速率进行分析,结果表明戊二醛加入明胶溶液后,体系黏度瞬间增大,10 min后维持稳定.最后,通过耐水性试验评价纤维膜交联效果,发现纤维膜有10%左右的溶解,但在水介质中仍可保持很好的纤维形态.     

功能化纳米粒子作为药物载体的研究

将合成的含有羧基侧基官能团的己内酯类聚合物, 用溶剂挥发与超声乳化相结合的方法制备成表面可供修饰的纳米粒子. 利用扫描电镜(SEM)研究了纳米粒子在水溶液中的形态. 使用5-氟脲嘧啶(5-FU)作为模型药物制备了载药纳米粒子, 利用紫外分光光度计法、差示扫描量热法(DSC)、X射线衍射法(XRD)研究了纳米粒子的载药及释放性能. 研究表明, 载药纳米粒子可以控制5-FU的释放速率. 释放时间可持续至96 h 以上, 符合Higuchi 动力学方程.     

电纺聚氧化乙烯纤维的分散形态和结晶行为研究

将聚氧化乙烯(PEO)水溶液在不同的工艺条件下进行电纺,制备了PEO纤维.用SEM研究了纤维的分散形态;用DSC和XRD研究了纤维的结晶性能.电纺纤维分散形态是由浓度、电压、固化距离等因素综合作用的结果.其中,浓度是最关键的因素.降低溶液浓度,提高静电压和增加固化距离均会使纤维变细.电纺得到的纤维与原粉相比,电纺使纤维结晶度下降,理论上分析了可能的机理.     

Green Electrospun Silk Fibroin Nanofibers Loaded with Cationic Ethosomes for Transdermal Drug Delivery

Transdermal drug delivery system(TDDS) facilitates the controlled release of active ingredients penetrating through the skin, avoiding the liver first pass effect. Electrospinning is a simple process to fabricate ultrafine fibers with a higher specific surface area, making them excellent candidates for drug delivery. In current work, a novel silk fibroin(SF) nanofiber loaded with cationic ethosomes(CEs) was prepared via green electrospinning. The data of Fourier transform infrared spectroscopy(FTIR) and laser scanning confocal microscopy(LSCM) confirmed the existence of CEs in the SF nanofibers. The morphology of the nanofibers was not significantly affected by the incorporation of CEs as shown by scanning electron microscopy(SEM) images. The CEs-loaded SF nanofibrous patch (CEs-SFnP) showed good cytocompatibility as proved by both cell counting Kit-8(CCK-8) assay and SEM. Using doxorubicin hydrochloride(Dox) as a model drug, the transdermal performance of CEs-SFnP was evaluated through Franz diffusion cell against mouse skin. The results indicated that CEs-SFnP can effectively deliver drug into the skin, with a much higher permeation rate than the normal nanofibers without CEs. The as-spun CEs-SFnP in this study could find promising applications in TDDS.     

SnO2/TiO2复合纳米纤维的制备及光催化性能

采用静电纺丝技术,以聚乙烯吡咯烷酮和钛酸正丁酯为前驱体,制得锐钛矿相TiO2纳米纤维。以TiO2纳米纤维为模板,通过水热合成法,制备了具有异质结构的SnO2/TiO2复合纳米纤维。利用扫描电镜(SEM)、X射线能量色散光谱（EDS）、透射电镜(TEM)和X射线衍射(XRD)等分析测试手段对其形貌和结构进行了表征,结果表明,SnO2纳米粒子均匀地生长在TiO2纳米纤维表面,形成了异质结构的SnO2/TiO2复合纳米纤维材料。通过改变反应物浓度,能有效地实现SnO2/TiO2复合纳米纤维的可控合成。以罗丹明B为模拟污染物,考察了SnO2/TiO2复合纳米纤维的光催化性能,与纯TiO2纳米纤维相比光催化活性明显提高,初步探讨了光催化反应机理。     

Preparation and Drug Release of PVA Composite Nanofibers Loaded Chitosan Microsphere

In this paper, we reported the fabrication of poly(vinyl alcohol)-chitosan (PVA-CS) microspheres composite nanofibers by electrospinning technique. The chitosan microspheres were firstly prepared by electrospray with the solution of chitosan and combretastatin A4. The morphology and size distribution of chitosan microspheres were analyzed by scanning electron microscopy. The influencing factors including the concentrations of both PVA and CS microspheres were studied. The physical properties of the composite nanofibers were characterized by X-ray diffraction (XRD). The drug release rate, MTT toxicity test, and cell culture were also investigated in detail. Results indicate that the chitosan microsphere-loaded composite nanofibers can be prepared when the PVA concentration is 120 mg/mL. The continuity of the nanofibers was influenced by the concentration of CS microspheres. The characteristic peaks of CS or PVA were not observed in the diffractograms after the CS and PVA were processed using the high-voltage electrostatic technique. In addition, the drug release rate showed that nanofibers induce an obvious slow-release effect. Composite nanofibers were non-toxic to fibroblasts cells, and the fibroblasts cells could proliferate on the nanofiber mat.     

Fabrication,characterization, and drug release study of vitamin C–loaded alginate/polyethylene oxide nanofibers for the treatment of a skin disorder

Pigmented purpuric dermatosis (PPD) is a skin disorder mainly seen in the lower limbs. The nanofibrous web has been shown to be an appropriate alternative for the treatment of skin diseases as a drug delivery vehicle. In this study, sodium alginate (SA)/polyethylene oxide (PEO) nanofibers containing vitamin C (VC) were fabricated using both blended electrospinning and core/shell electrospinning. The resultant nanofibers were characterized using Fourier transform infrared spectroscopy and scanning electron microscopy. Enhancing the VC content resulted in increasing the nanofibers diameter. Also, the degradation rate and drug release were investigated. Drug release was evaluated using the in vitro dissolution and permeation method. The degradation rate and the drug release of the core/shell nanofibers were found to be lower than those of the blended nanofibers. The drug release of the extended nanofibers followed a different pattern, indicating that the extension of the nanofibers could be a promising way to control the drug release.     

原位水热合成SrTiO3/TiO2复合纳米纤维及光催化性能

以利用静电纺丝技术制备的TiO2纳米纤维为模板和反应物,原位水热合成了具有异质结构的SrTiO3/TiO2复合纳米纤维.采用X射线衍射(XRD)、扫描电子显微镜(SEM)、能量散射光谱(EDS)、高分辨透射电子显微镜( HRTEM)和X射线光电子能谱(XPS)等测试手段对样品的结构和形貌进行了表征.用罗丹明B(RB)模...     

Therapeutic effects of the as-synthesized polylactic acid/chitosan nanofibers decorated with amphotricin B for in vitro treatment of Leishmaniasis

Leishmaniasis is one of the biggest concerns of the World Health Organization (WHO) due to its severe side effects, the emergence of resistance, and secondary bacterial infections; therefore, it was reported as an epidemic, especially in immunocompromised individuals. The main purpose of this study was to synthesize and characterize the polylactic acid (PLA)/chitosan nanofibers decorated with amphotericin B as a new delivery system for the in vitro treatment of leishmaniasis wounds. The prepared nanofibers were characterized using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), dynamic light scattering (DLS), X-ray diffraction (XRD), and in vitro drug release test. The anti-leishmanial effect of nanofibers decorated with amphotericin B against Leishmania major promastigotes and its cytotoxicity to macrophages were determined by the flow cytometry test. The in vitro drug release assay indicated that 84% of the amphotericin B loaded in nanofibers was released after 400 min. The average concentration of the amphotericin B loaded in PLA/chitosan nanofibers and the conventional form of amphotericin B that prevented the growth of 50% of the promastigotes of L. major were 1.29 and 4.34 µg/mL, respectively.     

p-CuO/n-In_2O_3异质结纳米纤维的制备及气敏特性

以电纺In_2O_3纳米纤维为模版,通过溶剂热法构建了p-CuO/n-In_2O_3异质结纳米纤维.采用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射(XRD)和X射线光电子能谱(XPS)等方法对所得材料的形貌和结构进行表征.结果表明,CuO纳米颗粒可以均匀地负载在超细In_2O_3纳米纤维表面;随着反应液中乙酸铜浓度的增加,负载的CuO纳米颗粒密度也逐渐增加.通过制备旁热式气敏器件对复合纳米纤维材料的气敏特性进行了研究.结果表明,与纯In_2O_3纳米纤维相比,p-CuO/n-In_2O_3异质结纳米纤维对H_2S气体具有较高的灵敏度和较低的工作温度.     

AgNPs incorporated on deacetylated electrospun cellulose nanofibers and their effect on the antimicrobial activity

In the present study, cellulose acetate (CA) nanofibers were prepared by electrospinning technique. Alkaline hydrolysis was introduced for conversion of CA nanofibers to cellulose nanofibers. Nanofibers were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Fourier transform infrared spectroscopy (FTIR). Furthermore, silver nanoparticles (AgNPs) were incorporated on regenerated cellulose nanofibers with different concentrations and used as an antimicrobial agent against Gram negative Escherichia coli BH5 α , Gram positive Spectromyces arenus, and Aspergillus flavus. Strong inhibition activities were determined.     

Fabrication,characterization and in vivo evaluation of dexpanthenol sustained-release nanofibers for wound healing

In this study, wound dressings consisting of dexpanthenol (Dex)-loaded electrospun nanofibers were fabricated using polyvinyl alcohol (PVA)/sodium alginate (SA), and chitosan as the core and the shell, respectively. Considering the remarkable properties of chitosan, it was used as a shell against drug release and to improve the thermal stability, and tensile strength of the scaffold. By comparing the thermogravimetric, and tensile strength results of nanofibers with and without shell, it was revealed that the presence of chitosan in the shell side could improve the thermal stability and increased the tensile strength by about three times. The isotherm models of dexpanthenol release from the PVA/SA/Dex-CS scaffold was best described by the Langmuir model. Besides, Fourier transform infrared, scanning electron microscopy, and X-ray diffraction techniques were performed to characterize nanofibers. Furthermore, an in vivo investigation of a wound dressing with dexpanthenol showed better healing compared to the wound dressings without dexpanthenol.     

Large-scale synthesis of tungsten oxide nanofibers by electrospinning

We show in this communication that large-scale synthesis of orthorhombic WO3 nanofibers can be obtained via a simple electrospinning method. The morphology and the crystal structure are investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), FTIR, X-ray diffraction patterns (XRD) and X-ray photoelectron spectra (XPS) spectra. SEM and TEM images showed that the diameter of the obtained WO3 nanofibers is between 100 and 500 nm. The structure of the obtained WO3 nanofibers was characterized by FTIR, XRD, and XPS spectra. The photoluminescence of the obtained WO3 nanofibers were also investigated.