A review of green methods for phyto-fabrication of hematite (α-Fe2O3) nanoparticles and their characterization, properties, and applications

Modifications of FLC Physical Properties through Doping with Fe2O3 Nanoparticles (Part I)

“…In this paper, we present the influence of Fe 2 O 3 nanoparticles with diameter below 50 nm on the physical properties of the liquid crystalline matrix. We have chosen Fe 2 O 3 nanoparticles as an admixture because they have various unusual physical properties, are easy to synthesize and inexpensive, are non-toxic and have pronounced antibacterial properties; moreover, they are stable in an interesting temperature range (0–110 °C) [ 26 , 34 , 35 , 36 ]. Currently, the main obstacle to the use of the ferroelectric liquid crystal in display technology is the shock problem, i.e., irreversible destruction of an aligned LC layer by mechanical stress, although Pozhidaev et al have recently reported on the synthesis of shock-free ferroelectric liquid crystal FLC-595 [ 37 ].…”

Green Synthesis of Hexagonal Hematite (α-Fe2O3) Flakes Using Pluronic F127-Gelatin Template for Adsorption and Photodegradation of Ibuprofen

“…Hematite structure resembles corundum, in which the Fe 3+ cations are connected to the octahedral oxygen via the covalent bonds in a hexagonal closed packing crystal system [4]. Hematite was reported to have high adsorption performance and stability, and to be easy and cheap to synthesize [1,[6][7][8]. The surface area of hematite was reported between 10-90 m 2 /g, thus showing ability as adsorbent in the removal of cephalecin, acetylsalicylic acid, congo red, and heavy metals [2,3].…”

“…Hematite is naturally available in abundance, non-toxic to the environment, and its chemical activity is greatly influenced by the multiple oxidation states. Hematite can be synthesized using arc-discharge, micro-emulsion, thermal decomposition, hydrothermal synthesis, ball milling, sol-gel, electrolysis, and co-precipitation methods [6]. Another method that received increasing attention is preparation of iron oxide using a green templating method.…”

“…The use of synthetic structure directing agents such as P-123, F-127, cetyl trimethylammonium bromide, and cetyl trimethylammonium chloride [17][18][19][20][21] can be minimized by replacing the template with biodegradable natural reagents. Green synthesis is also beneficial in minimizing the production of residual waste from utilization of hazardous chemical reagents [6,22]. Green synthesis using plant extract from green tea, kurkuma, and lantana fir leaves produced hematite with rod, hexagonal, cone cube, and flake structures [6,23].…”

“…Green synthesis is also beneficial in minimizing the production of residual waste from utilization of hazardous chemical reagents [6,22]. Green synthesis using plant extract from green tea, kurkuma, and lantana fir leaves produced hematite with rod, hexagonal, cone cube, and flake structures [6,23]. However, a high concentration of plant extract was required for rearrangement of the molecules to form uniform structure.…”