Lamellar-like Electrospun Mesoporous Ti-Al-O Nanofibers

Abstract

Ceramic oxides nanofibers are promising materials as catalysts, electrodes and functional materials. In this report, a unique lamellar-like mesoporous structure was realized for the first time in a new system based on titania and alumina. The final structure was found to be highly dependent on the process conditions which are outlined herein. In view of the similar architecture we recently obtained with Fe-Al-O fibers, the pore formation mechanism we outline herein is general and is applicable to additional systems.

Electrospun Fe–Al–O Nanobelts for Selective CO2 Hydrogenation to Light Olefins

“…It is common to see a reduction in fibers' diameter between the raw nanofibers and the sintered ceramic nanofibers. 33,34 In cases where the increase in sample temperature is sufficiently slow, we hypothesize that the metal-oxides on the outer surface of the nanofibers form a crust or shell that is initially sufficiently flexible (or unstable) that it shrinks radially as the thermal treatment progresses. Thus, the solid round geometry seen in the raw fibers is retained.…”

“…Application of the electrospinning (ES) technique for preparation of the Fe–Al–O spinel catalyst enables the formation of metal oxides and other materials in the shape of nanofibers with various surface and inner morphologies and hierarchical structures. − Among the reported morphologies are lamellar-like mesoporous nanofibers, , hollow nanofibers, , and flat nanobelts . During the thermal treatment of raw ES fibers, the organic parts decompose to produce the ceramic phase and final structure.…”

“…Although much work was done on the effect of applied thermal treatment on morphology, ,, almost no work has been done to examine the effect of the green nanofibers’ mat thickness on the morphology of the final nanofibers after heating. Yet, the heat generated during exothermic oxidative decomposition is a function of the sample’s volume while heat removal from the environment is a function of the sample’s external surface.…”

Performance of Cu/ZnO Nanosheets on Electrospun Al2O3 Nanofibers in CO2 Catalytic Hydrogenation to Methanol and Dimethyl Ether

“…Electrospun alumina nanofibers AlNFs were produced similarly to earlier work [ 43 ]. The ES precursor solution consisted of 13 wt% Al(acetylacetonate) 3 (Aldrich, St. Louis, MO, USA), which was mixed and stirred with acetic acid glacial (Frutarom, Herzliya, Israel) (60 wt%) and 96% ethanol (Bio-Lab, Jerusalem, Israel) (20 wt%) for 30 min until a homogenous yellowish solution was obtained.…”

“…In fact, nanofibers possess high surface-area-to-volume ratio beneficial for heterogeneous catalysis [ 40 , 41 , 42 ]. Furthermore, novel porous or core–shell shapes with designed architecture and composition are applicable to nanofibers and can be ideal for catalytic purposes [ 43 , 44 , 45 ]. Due to their structure, nanofibers are expected to exhibit enhanced stability under stream compared with the powder nanoparticle-based catalysts [ 46 , 47 , 48 ].…”