TiO2/聚乳酸复合纳米纤维膜的制备及其抗菌性能

采用静电纺丝技术,分别制备了纯聚乳酸(PLA)纳米纤维膜和不同TiO2含量的TiO2/PLA复合纳米纤维膜。利用扫描电子显微镜、傅里叶红外光谱和电子万能试验机分别对复合纳米纤维膜进行了形貌表征、成分分析和力学性能测试,用改良的振荡烧瓶法测试了复合纳米膜的抗菌性能。结果表明:随TiO2含量的增加,纤维直径减小而CV值和表面颗粒尺寸有所增加;复合纳米纤维膜中含有TiO2成分,证明TiO2与聚乳酸能够物理复合;添加适量的TiO2能够提高纳米纤维膜的断裂强度;在光催化条件下,TiO2/PLA复合纳米纤维膜对大肠杆菌和金黄色葡萄球菌表现出良好的抗菌性能,当TiO2含量为1%时,对两种菌的抑菌率分别达到92.9%和92.2%。     

静电纺Ag@MOF-5/β-CD抗菌纤维膜的制备及性能

采用水热法制备了金属有机骨架材料(MOF-5)和载银MOF-5(Ag@MOF-5),利用静电纺丝技术制备了具有三维交联网络结构的静电纺β-环糊精(β-CD)、MOF-5/β-CD、Ag@MOF-5/β-CD纤维膜。通过扫描电子显微镜(SEM)、高分辨透射电子显微镜和能谱(HRTEMEDS)仪、热重分析(TG)仪、万能材料试验机及抑菌圈法对静电纺纤维膜进行了形貌、结构表征及性能测试。结果表明:Ag@MOF-5纳米晶片中均匀负载大量直径为3～5 nm的球状银纳米粒子。静电纺β-CD纤维直径约为500 nm,分布均一,表面光滑平整; MOF-5、Ag@MOF-5加入纺丝液后,纤维直径分布不均,出现大量细丝且更为平直; Ag@MOF-5随成膜物质呈纤维状排列,大部分被成膜物包裹。纤维膜的耐热温度为250℃,MOF-5、Ag@MOF-5的加入不影响β-CD的交联过程、吸水特性及热分解温度; Ag@MOF-5的加入量可达1%(质量分数)且保持静电纺Ag@MOF-5/β-CD纤维膜的力学性能不降低。静电纺MOF-5/β-CD对两种菌的24 h抗菌性能受限,而Ag@MOF-5的加入量为0. 5%(质量分数)时Ag@MOF-5/β-CD的24 h抗菌效果达到良好。     

负载金属氧化物纳米夹心材料的制备及抗菌性能

采用静电纺丝法制备了负载有不同含量金属氧化物的纳米TiO2/聚已内酰胺(PA6)及纳米TiO2/PA6/Ag纤维,通过扫描电镜(SEM)对纤维进行了表征,纤维直径在50nm～100 nm之间;讨论了纤维平均直径与溶液黏度及电导率之间的关系;实验选用霉茵作为测试菌种,采用振荡瓶法对纤维进行抗茵性能测试,结果表明,抗茵纤维...     

TiO2/活性炭复合纳米纤维膜的制备及表征

在聚丙烯腈(PAN)、N,N-二甲基甲酰胺(DMF)体系中加入钛酸四丁脂水解溶胶,通过静电纺丝技术得到纳米纤维膜,经预氧化、炭化、活化制备出TiO2/活性炭复合纳米纤维膜。采用扫描电子显微镜、X射线能谱、热分析、傅里叶红外光谱、X射线衍射以及测定Zeta电位和表面接触角等手段对TiO2/活性炭复合纳米纤维膜进行表征。结果表明,当V(PAN)∶V(DMF)∶V(Ti(OH)4)溶胶=3∶17∶3时,可制得纤维直径为600～700nm的TiO2/活性炭复合纳米纤维膜。纳米TiO2在TiO2/活性炭复合纳米纤维膜中分布均匀,晶型结构易于控制;TiO2/活性炭复合纳米纤维膜有较强的光催化活性和吸附活性,可以作为环境功能材料使用。     

气流电纺丝基夹心净化材料的制备与表征

纳米TiO2作为一种高效、无毒的光催化剂,在环保领域得到了广泛应用。其应用首先应考虑和解决的就是其有效负载问题。文中采用气流电纺法制备了TiO2/尼龙6(PA6)纳米复合纤维。通过X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、X射线能谱仪(EDX)和热重分析(TG)等技术手段对纤维形貌与结构进行了表征,并采用Shake Flask法对纤维抗菌性能进行了测试。结果表明,气流电纺纤维的平均直径在60 nm～65 nm之间,杀菌率最高可达99.74%。通过热压将此纤维制备成"夹心"式净化材料,其对1μm的PS微球的过滤效率可达99.50%。     

电纺纳米纤维的表面形态研究

使用静电纺丝的方法电纺不同材料,得到不同的纳米纤维,通过SEM电镜观察纳米纤维的表面形态,分析造成纳米纤维表面形态不同的原因,给出造成纳米纤维表面形态可能影响因素,为纳米纤维表面形态形成的研究提供了一些新思路。     

天然纤维素/聚丙烯腈抗菌纳米纤维的制备与表征

为了拓展天然纤维素材料的应用,在综合国内外对天然纤维素材料、纳米材料和抗菌材料相关研究的基础上,首先,利用LiCl/二甲基乙酰胺(DMAC)溶剂体系配置了不同共混比例的天然纤维素/聚丙烯腈纺丝液,采用静电纺丝技术制备了纤维素/聚丙烯腈纳米纤维。然后,用铜氨溶液对纳米纤维进行了抗菌处理,制备了具有一定抗菌功能的纤维集合体。最后,采用SEM观察不同共混比例下纳米纤维的微观形貌;采用TG和DSC表征其热性能;采用FTIR和表面接触角测量仪表征共混后纳米纤维的化学组成和亲水性的变化;采用振荡法测定纳米纤维的抗菌性能。结果表明:通过静电纺丝技术可制得直径在200~400nm范围内的纤维素/聚丙烯腈纳米纤维。随着纤维素含量的提高,纳米纤维的表面越来越粗糙,粘连愈加严重,且直径离散度也变大。当纤维素与聚丙烯腈的共混质量比大于75∶25时,纤维的直径标准偏差由纯聚丙烯腈纤维的100nm以下变为150nm以上。纤维素/聚丙烯腈纳米纤维具有良好的热性能,与纯纤维素纳米纤维相比热稳定性有一定提高,当纤维素与聚丙烯腈的共混质量比为25∶75时热稳定性最好。纤维素/聚丙烯腈纳米纤维的亲水性优于普通医用纱布的。经过铜氨溶液抗菌处理的纳米纤维具有良好的抗菌性能,对金黄色葡萄球菌和大肠杆菌的抑菌率分别为82%和75%。     

纳米二氧化钛复合纤维织物的抗光降解及耐久抗菌研究进展

纳米二氧化钛是一种性能优异的光催化型抗菌除臭剂,但在高分子纤维织物方面的应用尚属研究阶段,主要涉及两个关键问题:避免纳米TiO2对所附着的纤维织物高分子基体光降解损伤;寻找纳米TiO2与纤维织物表面的耐久性锚固方式.以纤维织物为重点,分析近年来国内外在这两方面的研究进展,指出设置中间抗氧化层及其表面抗菌性接枝改性是目前解决上述问题的两种有效方法,二者的有机结合将促进纳米TiO2在纤维织物领域的应用.     

空气过滤用静电纺纳米纤维材料的研究进展

介绍了静电纺丝技术在空气过滤方面的应用,回顾了纤维过滤材料的发展历史,并详细阐述了静电纺纳米纤维毡、复合型纳米纤维毡和抗菌性纳米纤维毡等过滤材料在国内外的研究进展。     

ZnxCd1-xS/TiO2核壳型异质结的制备及其光催化性能

通过静电纺丝和水热法联用成功制备了ZnxCd1-xS/TiO2核壳纳米纤维。利用XRD、SEM、UV-vis、EDS、BET对样品结构等进行了表征。结果表明,在TiO2纳米纤维表面生长了一层致密的ZnxCd1-xS纳米颗粒,形成ZnxCd1-xS/TiO2核壳型异质复合材料,且其光催化活性均比纯TiO2纳米纤维高。通过调节水热温度,可以控制ZnxCd1-xS表面形貌和x值。当水热温度为200℃时,x值最大,材料光催化活性最高。     

Nylon6-TiO_2杂化超细纤维的制备与表征

采用静电纺丝法制备了Nylon6-TiO2及其杂化超细纤维无纺布。使用SEM、TEM和FTIR等方法探讨了其微观形貌、结构,并通过抗菌性能方法验证其抗菌性能与不同金属离子掺杂Nylon6-TiO2纤维膜的关系。结果表明：Ag＋的掺杂可改善电纺纤维的形貌特征,使纤维尺寸均匀,珠状物减少;Cu2＋的掺杂降低了Nylon6-...     

Preparation and characterization of TiO2 coated Fe nanofibers for electromagnetic wave absorber

Recently, electromagnetic interference (EMI) and electromagnetic compatibility (EMC) have become serious problems due to the growth of electronic device and next generation telecommunication. It is necessary to develop new electromagnetic wave absorbing material to overcome the limitation of electromagnetic wave shielding materials. The EMI attenuation is normally related to magnetic loss and dielectric loss. Therefore, magnetic material coating dielectric materials are required in this reason. In this study, TiO2 coated Fe nanofibers were prepared to improve their properties for electromagnetic wave absorption. Poly(vinylpyrrolidone) (PVP) and Iron (III) nitrate nonahydrate (Fe(NO3)3 x 9H2O) were used as starting materials for the synthesis of Fe oxide nanofibers. Fe oxide nanofibers were prepared by electrospinning in an electric field and heat treatment. TiO2 layer was coated on the surface of Fe oxide nanofibers using sol-gel process. After the reduction of TiO2 coated Fe oxide nanofibers, Fe nanofibers with a TiO2 coating layer of about 10 nm were successfully obtained. The morphology and structure of fibers were characterized by SEM, TEM, and XRD. In addition, the absorption properties of TiO2 coated Fe nanofibers were measured by network analyzer.     

静电纺丝法制备尼龙-6/SiO2-TiO2杂化纳米纤维

采用静电纺丝法结合溶胶凝胶技术,制备了尼龙-6/SiO2-TiO2杂化纳米纤维。采用红外光谱（FT-IR）、X射线衍射（XRD）、UV-vis、热重分析（TG）和扫描电镜（SEM）等对杂化纳米纤维进行分析表征。结果表明,随着SiO2-TiO2溶胶的引入,电纺纤维的结晶度下降,耐热性能提升。尼龙-6电纺纤维的平均直径约为...     

Photocatalytic and antibacterial properties of a TiO2/nylon-6 electrospun nanocomposite mat containing silver nanoparticles

Silver-impregnated TiO(2)/nylon-6 nanocomposite mats exhibit excellent characteristics as a filter media with good photocatalytic and antibacterial properties and durability for repeated use. Silver nanoparticles (NPs) were successfully embedded in electrospun TiO(2)/nylon-6 composite nanofibers through the photocatalytic reduction of silver nitrate solution under UV-light irradiation. TiO(2) NPs present in nylon-6 solution were able to cause the formation of a high aspect ratio spider-wave-like structure during electrospinning and facilitated the UV photoreduction of AgNO(3) to Ag. TEM images, UV-visible and XRD spectra confirmed that monodisperse Ag NPs (approximately 4 nm in size) were deposited selectively upon the TiO(2) NPs of the prepared nanocomposite mat. The antibacterial property of a TiO(2)/nylon-6 composite mat loaded with Ag NPs was tested against Escherichia coli, and the photoactive property was tested against methylene blue. All of the results showed that TiO(2)/nylon-6 nanocomposite mats loaded with Ag NPs are more effective than composite mats without Ag NPs. The prepared material has potential as an economically friendly photocatalyst and water filter media because it allows the NPs to be reused.     

静电纺丝制备纳米纤维和纳米颗粒

利用静电纺丝方法制备聚乙烯砒咯烷酮(PVP)纳米纤维,研究了电纺溶液浓度、电压对PVP超细纤维的影响。证明了在一定范围内,纤维丝的直径随着浓度的增加越来越大,而随着电压的增加越来越小。同时制备了PVP/TiO2纳米纤维。采取高温和激光处理两种方法对复合纳米纤维进行烧结,用扫描电镜对其形貌进行表征。发现高温烧结后,TiO2颗粒发生严重的团聚。激光扫描后得到了分布均匀的TiO2颗粒,只有小部分的团聚。     

锌沸石-Ce/TiO2抗菌材料的制备及其性能研究

以纳米锐钛矿型TiO2粉体作为主要原料,锌沸石作为载体,铈离子为掺杂离子,采用浸渍法制备锌沸石-Ce/TiO2抗菌材料,运用抑菌圈法对其抗菌性能进行评价,用紫外光谱对比纯纳米TiO2抗菌材料和锌沸石-Ce/TiO2抗菌材料的光催化效果。结果表明,纳米TiO2与硝酸铈的物质的量比为40∶1、反应时间为0.5h、焙烧温度为300℃、pH=3条件下抗菌性能最佳,抑菌圈直径达到34.63mm。锌沸石-Ce/TiO2抗菌材料样品对于大肠杆菌具有明显的抑杀效果。     

Nanofibrous TiO2-core/conjugated polymer-sheath composites: synthesis, structural properties and photocatalytic activity

Nanofibrous TiO2-core/conjugated polymer-sheath composite nanocables were synthesized by in-situ chemical oxidative polymerization of aniline with oxidant in the presence of TiO, nanofibers prepared through an electrospinning process. During the polymerization process, aniline molecules were adsorbed on the surface of TiO2. Upon the addition of oxidant, the polymerization of aniline takes place on the surface of the TiO2 nanofibers and polyaniline (PANI) is gradually deposited on their surface. The resulting TiO2-PANI nanocomposites have a coaxial nanocable structure. The morphological and structural properties of the composite nanocables were analyzed by using high resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier-transform infrared (FT-IR) and UV-visible spectroscopy (UV-vis), respectively. The HRTEM images proved that PANI (20 nm thickness) covered the surface of the TiO2 nanofibers. Also, the photocatalytic activity for the degradation of organic dyes on fibrous photocatalysts under UV-light was studied. The photocatalytic experiments showed that dye could be degraded more efficiently on the TiO2-PANI composite nanocables than on pure TiO2, due to the charge transfer from PANI to TiO2. The method for the synthesis of these unique structured composite nanocables is simple, rapid and reproducible. This facile method may be developed to produce multifunctional nanocomposites of various polymers with metal oxide fibers on a large scale for various technological applications such as sensors, solar cells, and catalysts.     

层层组装技术制备纳米级TiO_2/聚电解质复合中空纤维催化剂

采用静电纺丝技术和层层组装技术制备了聚电解质/TiO2复合中空纳米纤维膜.通过控制PS纤维模板直径和吸附层数,TiO2中空纤维的直径和壁厚得到了很好的控制.在光催化降解乙醛性能实验中,TiO2中空纤维具有比P25更好的光催化性能.