新型磁性纳米复合微凝胶吸附剂的制备及其应用

近年来,低成本、高效的高分子纳米复合吸附剂的开发备受瞩目。以化学共沉淀法制备磁性纳米Fe3O4粒子,将得到的磁性纳米Fe3O4粒子在油相介质中功能化,并以功能化磁性纳米Fe3O4粒子为交联剂,接枝聚合丙烯酸单体和丙烯酰胺单体,得到了新型纳米Fe3O4/丙烯酸-丙烯酰胺共聚物复合磁性微凝胶吸附剂。该吸附剂具有制备工艺简便、原材料利用率高、成本低、固液分离容易、使用寿命长、对Pb(Ⅱ)和Cu(Ⅱ)具有选择吸附性等特点。     

氨基改性Fe3O4纳米粒子的制备及其对废水中Pb2+的吸附研究

采用化学共沉淀法合成了Fe3 O4纳米粒子,然后用碳二亚胺将聚丙烯酸接枝,再以二乙烯三胺(C4H13N3)为表面功能化试剂制备氨基功能化磁性Fe3O4@PAA@DETA,在不同温度和pH的条件下,研究其对Pb2+的吸附效果,吸附率可达92.74％.     

胺化Fe3O4@SiO2纳米颗粒的制备及其对水溶液中Cr(VI)的去除

六价铬(Cr(VI))因其高毒性受到人们广泛关注,为提高吸附法去除Cr(VI)的效率,合成了一种新型核壳结构的聚乙烯亚胺(PEI)功能化复合纳米颗粒(Fe3O4@SiO2–NH2),用于去除水中Cr(VI).研究了磁性纳米颗粒的化学结构、形貌和磁性特性.考察了初始浓度、吸附时间、溶液pH值和无机阴离子对Cr(VI)吸附...     

Fe3O4/MLS复合聚合物吸附树脂的结构及其重金属离子吸附性能

采用水溶液聚合制备了 Fe3O4/硅酸镁锂(MLS)复合聚合物吸附树脂,并对其结构和重金属离子吸附性能进行了研究,磁性纳米材料粒径为15～20 nm.通过硅烷偶联剂和聚乙烯亚胺的表面修饰,磁性纳米粒子的团聚现象明显减弱,比饱和磁化强度略微有所降低.Fe3O4/MLS复合聚合物吸附树脂具有一定的比饱和磁化强度和较好的磁响...     

硫醇点击化学法制备聚乙二醇功能化Fe3O4纳米粒子

该文首先使用高温热分解法制备出形貌规整、粒径均一的Fe3O4纳米粒子,再利用硫醇点击化学方法对Fe3O4纳米粒子进行聚乙二醇单甲醚功能化。采用XRD、TEM、FTIR、Raman、TG、VSM、UV对功能化前后Fe3O4纳米粒子的形貌、组成、磁性能进行了表征。结果表明,该改性方法简便、反应条件温和、易操作。利用硫醇点击化学法得到的聚乙二醇功能化Fe3O4纳米粒子能稳定地分散在水以及PBS溶液中,并且具有超顺磁性。     

沉积法制备Fe_3O_4/P(AA-DVB)磁性复合微球

通过静电吸附与机械力共同作用的沉积法制备得到了Fe3O4/P(AA-DVB)磁性复合微球。分别采用无皂乳液聚合和共沉淀法制备得到单分散的P(AA-DVB)胶体粒子及Fe3O4纳米粒子,在静电吸附和机械力作用下,将Fe3O4纳米粒子附着并嵌入P(AA-DVB)胶体粒子表面及内部,制备得到Fe3O4/P(AA-DVB)磁性复合微球。该方法的优势在于最终磁性复合微球的粒径及粒径分布可以由前驱体P(AA-DVB)胶体粒子调控。磁性复合微球表面和内部Fe3O4纳米粒子的分布及磁含量可以由机械力作用时间进行调节。所制备的Fe3O4/P(AA-DVB)磁性复合微球平均粒径为542 nm,磁含量范围在11%~33%内可调。     

Au/Fe3O4纳米复合材料的制备及其催化性能

通过将金纳米粒子铆接到Fe3O4载体表面,制得了Au/Fe3O4纳米复合粒子。首先以对苯二酚为还原剂还原HAuCl4制得球形金纳米粒子;然后采用溶剂热法制备Fe3O4磁性纳米颗粒,并用巯基丙酸(MPA)对其修饰;最后通过MPA与金纳米粒子之间的相互作用,将金纳米颗粒固定到Fe3O4表面。采用透射电子显微镜(TEM)、扫描电子显微镜(SEM)、X射线衍射仪(XRD)、傅里叶变换红外光谱仪(FTIR)和振动样品磁强计(VSM)和紫外-可见分光光度计(UV-vis)对所制备材料进行形貌、晶型、磁性和催化性能的表征。结果表明,金纳米颗粒成功包覆在Fe3O4表面,所得到的Au/Fe3O4复合纳米材料具有单分散性和超顺磁性,并且对NaBH4还原对硝基苯酚(4-NP)制备对氨基苯酚(4-AP)的反应显示出优良的催化性能。     

壳聚糖修饰磁性纳米粒子对BSA的吸附性能

采用化学共沉淀法制备磁性Fe3O4纳米粒子,以（3-氯丙基）三甲氧基硅烷为偶联剂将壳聚糖共价键合到磁性Fe3O4纳米粒子的表面,通过红外光谱（FTIR）、X射线衍射（XRD）、扫描电子显微镜（SEM）及热重分析（TGA）对其进行了表征。主要研究了不同影响因素（吸附时间、pH值、牛血清白蛋白浓度）下壳聚糖修饰的磁性纳米粒子对牛血清白蛋白（BSA）的吸附性能。结果得到壳聚糖修饰的磁性Fe3O4纳米粒子粒径为20 nm左右,壳聚糖在磁性Fe3O4纳米粒子表面的接枝率为15.40%。研究表明：在不同条件下,与未修饰的磁性Fe3O4纳米粒子相比,经壳聚糖修饰的Fe3O4纳米粒子对BSA均表现出较强的吸附能力。     

油酸低温水洗改性磁性四氧化三铁纳米粒子

通过对油酸改性四氧化三铁(Fe3O4)磁性纳米粒子的制备工艺的改进研究，成功制备了分散性好、磁响应性强的平均粒径在18 am的改性Fe3O4磁性纳米粒子，并通过X射线衍射、红外光谱、透射电镜等对制备的磁性纳米粒子进行了表征。结果表明：当采用60℃的反应温度进行改性处理，以蒸馏水进行洗涤时，得到的油酸改性Fe3O4磁性纳...     

磁性锂皂石复合聚合物吸附树脂的合成及性能

以聚乙烯亚胺(PEI)改性磁性纳米粒子和锂皂石为物理交联剂,聚乙二醇双丙烯酸酯为化学交联剂,采用水溶液自由基聚合制备了磁性锂皂石复合聚合物吸附树脂,并对其结构和性能进行了初步研究,磁性锂皂石复合聚合物吸附树脂具有磁性Fe₃O₄的特征衍射峰,锂皂石以纳米片层结构无规分布于非晶态聚合物基体,磁性纳米粒子、γ-氯丙基三甲氧基硅烷(CPTMO)改性磁性纳米粒子及PEI改性磁性纳米粒子分散液的Tyndal效应和磁响应性均较为显著,磁性锂皂石复合聚合物吸附树脂具有较高的耐酸性能,60 min重金属离子吸附趋于平衡,90 min达到吸附平衡,Cu²⁺、Cd²⁺、Pb²⁺的平衡吸附量分别达到238、259和466 mg/g。     

Controlled assembly of Fe3O4 magnetic nanoparticles on graphene oxide

We describe a facile approach to controllable assembly of monodisperse Fe(3)O(4) nanoparticles (NPs) on chemically reduced graphene oxide (rGO). First, reduction and functionalization of GO by polyetheylenimine (PEI) were achieved simultaneously by simply heating the PEI and GO mixture at 60 °C for 12 h. The process is environmentally friendly and convenient compared with previously reported methods. Meso-2,3-dimercaptosuccinnic acid (DMSA)-modified Fe(3)O(4) NPs were then conjugated to the PEI moiety which is located on the periphery of the GO sheets via formation of amide bonds between COOH groups of DMSA molecules bound on the surface of the Fe(3)O(4) NPs and amine groups of PEI. The magnetic GO composites were characterized by means of TEM, AFM, UV-vis, FTIR, Raman, TGA, and VSM measurements. Finally, preliminary results of using the Fe(3)O(4)-rGO composites for efficient removal of tetracycline, an antibiotic that is often found as a contaminant in the environment, are reported.     

Functionalized magnetic-fluorescent hybrid nanoparticles for cell labelling

A facile method of synthesizing 60 nm magnetic-fluorescent core-shell bifunctional nanocomposites with the ability to label cells is presented. Hydrophobic trioctylphosphine oxide (TOPO)-capped CdSe@ZnS quantum dots (QDs) were assembled on polyethyleneimine (PEI)-coated Fe(3)O(4) nanoparticles (MNP). Polyethyleneimine was utilized for the realization of multifunction, including attaching 4 nm TOPO capped CdSe@ZnS quantum dots onto magnetite particles, altering the surface properties of quantum dots from hydrophobic to hydrophilic as well as preventing the formation of large aggregates. Results show that these water-soluble hybrid nanocomposites exhibit good colloidal stability and retain good magnetic and fluorescent properties. Because TOPO-capped QDs are assembled instead of their water-soluble equivalents, the nanocomposites are still highly luminescent with no shift in the PL peak position and present long-term fluorescence stability. Moreover, TAT peptide (GRKKRRQRRRPQ) functionalized hybrid nanoparticles were also studied due to their combined magnetic enrichment and optical detection for cell separation and rapid cell labelling. A cell viability assay revealed good biocompatibility of these hybrid nanoparticles. The potential application of the new magnetic-fluorescent nanocomposites in biological and medicine is demonstrated.     

Static magnetic field-assisted synthesis of Fe_3O_4 nanoparticles and their adsorption of Mn(Ⅱ) in aqueous solution

A facile method for synthesis of the magnetic Fe_3O_4 nanoparticles was introduced.Magnetic nanoparticles were prepared via co-precipitation method with(PMF) and without(AMF) 0.15 T static magnetic field.The effects of magnetic field on the properties of magnetic nanoparticles were studied by XRD,TEM,SEM,VSM and BET.The results showed that the magnetic field in the co-precipitation reaction process did not result in the phase change of the Fe_3O_4 nanoparticles but improved the crystallinity.The morphology of Fe_3O_4 nanoparticles was varied from random spherical particles to rod-like cluster structure.The VSM results indicated that the saturation magnetization value of the Fe_3O_4 nanoparticles was significantly improved by the magnetic field.The BET of Fe_3O_4nanoparticles prepared with the magnetic field was larger than the control by 23.5%.The batch adsorption experiments of Mn(Ⅱ) on the PMF and AMF Fe_3O_4 nanoparticles showed that the Mn(II) equilibrium capacity was increased with the pH value increased.At pH 8,the Mn(Ⅱ) adsorption capacity for the PMF and AMF Fe_3O_4 was reached at 36.81 and 28.36 mg·g~(-1),respectively.The pseudo-second-order model fitted better the kinetic models and the Freundlich model fitted isotherm model well for both PMF and AMF Fe_3O_4.The results suggested that magnetic nanoparticles prepared by the magnetic field presented a fairly good potential as an adsorbent for an efficient removal of Mn(Ⅱ) from aqueous solution.     

青霉素酰化酶在高磁性无机复合材料上的固定化研究

利用共沉淀方法制备出饱和磁化强度为66.2emu/g的Fe3O4,通过溶胶-凝胶进行氨基功能化改性后饱和磁强度仍高达27.2e-mu/g,其剩磁和矫顽力均为0。对不同反应工艺制备的磁性复合载体进行固定化青霉素酰化酶（PGA）,当戊二醛的浓度为0.02%时,固定化酶的起始表观酶活为3198.38 IU/g,当戊二醛的浓度为0.1%时,进行持续间歇8次使用后,活性为起始活性的86.1%。     

一种用于废水中重金属吸附的磁性纳米材料制备

水体中大量的重金属离子严重威胁着水生物和人类的生存健康。磁性纳米材料特有的表面效应和磁响应特性,使其在作为重金属离子吸附剂时具有高效回收、脱附简单、避免对水体的二次污染等优点。制备了一种用于吸附废水中重金属的磁性纳米材料,以戊二醛(GA)为间隔臂,将聚乙烯亚胺(PEI)修饰在商品化的四氧化三铁磁球上,最终得到一种用于富集废水中重金属的磁性纳米材料Fe_3O_4@SiO_2@GA@PEI。     

Fe_3O_4/P(St/ACPA)磁性高分子纳米球的制备与磁性能研究

采用化学共沉淀方法制备Fe_3O_4磁性粒子,并使用油酸和十一烯酸对其进行表面改性,然后采用一步细乳液聚合法制备含有羧基官能团的Fe_3O_4/P(St/ACPA)磁性高分子纳米球,对磁流体和磁性高分子纳米球进行性能表征。结果表明,改性的Fe_3O_4磁流体分散性好,粒径均一,在室温下呈超顺磁性,磁含量为68.5%(w),饱和磁化强度为51.3emu/g;Fe_3O_4/P(St/ACPA)磁性高分子纳米球成球性好,粒径为70 nm,磁含量为39%(w),饱和磁化强度为27.9 emu/g。     

Magnetite nanoparticles for functionalized textile dressing to prevent fungal biofilms development

ABSTRACT: The purpose of this work was to investigate the potential of functionalized magnetite nanoparticles to improve the antibiofilm properties of textile dressing, tested in vitro against monospecific Candida albicans biofilms. Functionalized magnetite (Fe3O4/C18), with an average size not exceeding 20 nm, has been synthesized by precipitation of ferric and ferrous salts in aqueous solution of oleic acid (C18) and NaOH. Transmission electron microscopy, X-ray diffraction analysis, and differential thermal analysis coupled with thermo gravimetric analysis were used as characterization methods for the synthesized Fe3O4/C18. Scanning electron microscopy was used to study the architecture of the fungal biofilm developed on the functionalized textile dressing samples and culture-based methods for the quantitative assay of the biofilm-embedded yeast cells. The optimized textile dressing samples proved to be more resistant to C. albicans colonization, as compared to the uncoated ones; these functionalized surfaces-based approaches are very useful in the prevention of wound microbial contamination and subsequent biofilm development on viable tissues or implanted devices.     

磁性Fe3O4纳米粒子用作靶向药物载体的制备及分析

Fe3O4 magnetic nanoparticles were prepared by the aqueous co-precipitation of FeCl3·6H2O and FeCl2·4H2O with addition of ammonium hydroxide. The conditions for the preparation of Fe3O4 magnetic nanoparticles were optimized, and Fe3O4 magnetic nanoparticles obtained were characterized systematically by means of transmission electron microscope (TEM), dynamic laser scattering analyzer (DLS) and X-ray diffraction (XRD). The results revealed that the magnetic nanoparticles were cubic shaped and dispersive, with narrow size distribution and average diameter of 11.4nm. It was found that the homogeneous variation of pH value in the solution via the control on the dropping rate of aqueous ammonia played a critical role in size distribution. The magnetic response of the product in the magnetic field was also analyzed and evaluated carefully. A 32.6 mT magnetic field which is produced by four ferromagnets was found to be sufficient to excite the dipole moments of 0.05g Fe3O4 powder 2cm far away from the ferromagnets. In conclusion, the Fe3O4 magnetic nanoparticles with excellent properties were competent for the magnetic carriers of targeted-drug in future application.     

油相稳定分散Fe3O4纳米粒子的制备研究

分别采用热分解法及共沉淀油酸同步修饰法制备了2种可以在油相稳定分散的Fe3O4纳米粒子,并对热分解法制备Fe3O4纳米粒子的反应条件进行了优化,考察了热分解温度、熟化时间对颗粒粒径、形貌及磁性能的影响。通过TEM、VSM和FTIR等表征手段对2种方法制备的Fe3O4纳米粒子的油相分散稳定性、颗粒形貌及粒径、比饱和磁化强度及表面性质进行了比较。结果表明:热分解法制备的Fe3O4纳米粒子表现出更好的油相分散稳定性,共沉淀油酸同步修饰法制备的Fe3O4纳米粒子则表现出更好的磁响应性。