Marić Ivan, Vujičić Nataša Šijaković, Pustak Anđela, Gotić Marijan, Štefanić Goran, Grenèche Jean-Marc, Dražić Goran, Jurkin Tanja
Radiation Chemistry and Dosimetry Laboratory, Division of Materials Chemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia.
Laboratory for Supramolecular Chemistry, Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia.
Nanomaterials (Basel). 2020 Sep 12;10(9):1823. doi: 10.3390/nano10091823.
Magnetic polymer gels are a new promising class of nanocomposite gels. In this work, magnetic PEO/iron oxide nanocomposite hydrogels were synthesized using the one-step -irradiation method starting from poly(ethylene oxide) (PEO) and iron(III) precursor alkaline aqueous suspensions followed by simultaneous crosslinking of PEO chains and reduction of Fe(III) precursor. -irradiation dose and concentrations of Fe, 2-propanol and PEO in the initial suspensions were varied and optimized. With 2-propanol and at high doses magnetic gels with embedded magnetite nanoparticles were obtained, as confirmed by XRD, SEM and Mössbauer spectrometry. The quantitative determination of -irradiation generated Fe was performed using the 1,10-phenanthroline method. The maximal Fe molar fraction of 0.55 was achieved at 300 kGy, pH = 12 and initial 5% of Fe. The DSC and rheological measurements confirmed the formation of a well-structured network. The thermal and rheological properties of gels depended on the dose, PEO concentration and initial Fe content (amount of nanoparticles synthesized inside gels). More amorphous and stronger gels were formed at higher dose and higher nanoparticle content. The properties of synthesized gels were determined by the presence of magnetic iron oxide nanoparticles, which acted as reinforcing agents and additional crosslinkers of PEO chains thus facilitating the one-step gel formation.
磁性聚合物凝胶是一类新型且有前景的纳米复合凝胶。在这项工作中，采用一步辐照法，从聚环氧乙烷（PEO）和铁（III）前驱体碱性水悬浮液开始，通过同时交联PEO链和还原铁（III）前驱体，合成了磁性PEO/氧化铁纳米复合水凝胶。对初始悬浮液中的辐照剂量以及铁、2 - 丙醇和PEO的浓度进行了变化和优化。通过X射线衍射（XRD）、扫描电子显微镜（SEM）和穆斯堡尔光谱法证实，在有2 - 丙醇且高剂量的情况下，获得了嵌入磁铁矿纳米颗粒的磁性凝胶。使用1,10 - 菲啰啉法对辐照产生的铁进行了定量测定。在300千戈瑞、pH = 12以及初始铁含量为5%时，实现了最大铁摩尔分数0.55。差示扫描量热法（DSC）和流变学测量证实形成了结构良好的网络。凝胶的热性能和流变性能取决于剂量、PEO浓度和初始铁含量（凝胶内部合成的纳米颗粒数量）。在较高剂量和较高纳米颗粒含量下形成了更多非晶态且更强的凝胶。合成凝胶的性能由磁性氧化铁纳米颗粒的存在决定，这些纳米颗粒充当了增强剂和PEO链的额外交联剂，从而促进了一步凝胶的形成。
