Nady Norhan, Salem Noha, Elmarghany Mohamed R, Salem Mohamed S, Kandil Sherif H
Polymeric Materials Research Department, City of Scientific Research and Technological Applications (SRTA-City), Borg El-Arab City, Alexandria 21934, Egypt.
Department of Materials Science, Institute of Graduate Studies and Research, Alexandria University, Alexandria 21526, Egypt.
Membranes (Basel). 2022 Dec 13;12(12):1259. doi: 10.3390/membranes12121259.
This work presents novel magnetic mixed cellulose-based matrix membranes that combine the advantages of a low-cost common polymer matrix, such as cellulose acetate (CA), and a low-cost magnetic filler. Moreover, the presented magnetic mixed CA matrix membranes were fabricated and used without applying an external magnetic field during either the membrane casting or the separating process. Poly(methylmethacrylate) and lithium chloride were used in order to improve the mechanical properties and porosity of the fabricated membranes. The iron-nickel magnetic alloys used were prepared through a simple chemical reduction method with unique morphologies (FeNi-starfish-like and FeNi-necklace-like). The novel magnetic mixed CA matrix membranes fabricated were characterized using different analysis techniques, including SEM, EDX, XRD, TGA, and FTIR-ATR analyses. Furthermore, the static water contact angle, membrane thickness, surface roughness, tensile strength, and membrane porosity (using ethanol and water) were determined. In addition, vibrating sample magnetometer (VSM) analysis was conducted and the oxygen transition rate (OTR) was studied. The magnetic mixed CA matrix membrane containing starfish-like FeNi alloy was characterized by high coercivity (109 Oe) and an efficient 1.271 × 10 cm/(m·s) OTR compared to the blank CA membrane with 19.8 Oe coercivity and no OTR. The effects of the polymeric matrix composition, viscosity, and compatibility with the alloys/fillers used on the structure and performance of the fabricated mixed CA matrix membranes compared to the previously used poly(ethersufone) polymeric matrix are discussed and highlighted. The novel magnetic mixed CA matrix membranes presented have good potential for use in the oxygen-enrichment process.
这项工作展示了新型磁性混合纤维素基基质膜，其结合了低成本常见聚合物基质（如醋酸纤维素（CA））和低成本磁性填料的优点。此外，所展示的磁性混合CA基质膜在制膜或分离过程中均无需施加外部磁场即可制备和使用。使用聚甲基丙烯酸甲酯和氯化锂来改善所制备膜的机械性能和孔隙率。所使用的铁镍磁性合金通过简单的化学还原方法制备，具有独特的形态（类海星状FeNi和类项链状FeNi）。对所制备的新型磁性混合CA基质膜采用不同的分析技术进行表征，包括扫描电子显微镜（SEM）、能谱分析（EDX）、X射线衍射（XRD）、热重分析（TGA）和傅里叶变换红外衰减全反射光谱分析（FTIR - ATR）。此外，还测定了静态水接触角、膜厚度、表面粗糙度、拉伸强度和膜孔隙率（使用乙醇和水）。另外，进行了振动样品磁强计（VSM）分析并研究了氧气透过率（OTR）。与矫顽力为19.8 Oe且无OTR的空白CA膜相比，含有类海星状FeNi合金的磁性混合CA基质膜的特征在于具有高矫顽力（109 Oe）和高效的1.271×10 cm/(m·s) 的OTR。讨论并强调了与先前使用的聚醚砜聚合物基质相比，聚合物基质组成、粘度以及与所用合金/填料的相容性对所制备的混合CA基质膜的结构和性能的影响。所展示的新型磁性混合CA基质膜在富氧过程中具有良好的应用潜力。
