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81.
Mehrzad Arjmandi Majid Pakizeh Mohammadreza Saghi Abolfazl Arjmandi 《Petroleum Chemistry》2018,58(4):317-329
In this study, cubic and tetragonal structures of MOF-5 (C-MOF-5 and T-MOF-5) were successfully synthesized, characterized and incorporated into cellulose acetate (CA) polymer matrix in the range of 6, 9 and 12 wt % to fabricate mixed matrix membranes (MMMs). The effects of smaller pore size of T-MOF-5 and more ZnO molecules in T-MOF-5, on the H2 and CO2 permeation properties of C-MOF-5/CA and T-MOF-5/CA MMMs were investigated. The all novel MMMs were prepared using the solution casting method and characterized by FTIR, TGA and SEM. SEM images as well as results of FTIR and TGA analyses confirmed good adhesion between both MOF-5s and CA matrix. Addition of both C-MOF-5 and T-MOF-5 into the CA improved the gas transport properties of the CA, especially in H2 separation. The H2/CO2 selectivity continued the increasing trend at 9 wt % and did not significantly reduce even at 12 wt % due to good adhesion between both MOF-5s and CA. The highest H2/CO2 selectivity was obtained at 12 and 9 wt % loading of C-MOF-5 and T-MOF-5, respectively. By changing the filler from C-MOF-5 to T-MOF-5, the increasing and reducing of adsorption site of H2 and CO2 (respectively), and also reducing in pore size, caused the appearance of H2 permeability to not change much but the CO2 permeability to reduce. Accordingly, the H2/CO2 selectivity in all T-MOF-5/CA MMMs is higher than that in all C-MOF-5/CA MMMs. According to obtained results, the activated MOFs (i.e., C-MOF-5 in this study) are not always the best choices for separation process. 相似文献
82.
Mehrzad Zargarzadeh Maria C. Gomes Sónia G. Patrício Catarina A. Custódio João F. Mano 《Advanced functional materials》2023,33(48):2214372
Photo-crosslinkable platelet lysate (PL)-based hydrogels have been proven to support human-derived cell cultures owing to their high content of bioactive molecules, such as cytokines and growth factors. As a unique self-maintained and biocompatible 3D scaffold, the recently reported self-feeding hydrogels with enzyme-empowered degradation capacity have shown high biological performance in vitro and in vivo. To take advantage of all features of both PL and self-feeding hydrogels, here UV responsive laminaran-methacrylate (LamMA) and PL-methacrylate (PLMA) derivatives plus glucoamylase (GA), which significantly improve the overall features of a 3D system, is coupled. This self-sustaining hybrid hydrogel emerges as a unique scaffold due to the sustained delivery of glucose produced via enzymatic degradation of laminaran while granting the release of growth factors through the presence of PL. This biomaterial is applied to fabricate high-throughput freestanding microgels with controlled geometric shapes. Furthermore, this multicomponent hybrid hydrogel is successfully implemented as the first reported glucose supplier bioink to manufacture intricate and precisely defined cell-laden structures using a support matrix. Finally, such hydrogels are utilized as a proof of concept to serve as 3D in vitro cancer models, with the aim of recapitulating the tumor microenvironment. 相似文献