The one-step preparation of nanowires using a facile ultrafiltration technique: the case for biomedical chitosan and/or iron oxide nanowires

Abstract

This work presents the employment of a frequently-used ultrafiltration technique to drastically reduce the time required for the synthesis of chitosan nanowires, iron oxide nanowires and their complex nanowires. Instead of synthesizing iron oxide nanowires using time-consuming template and hydrothermal methods, a centrifugation force provides a tangential flow to force both iron ions and/or the diluted chitosan solution to pass through a filter and co-precipitate into nanowires within 1 min. Two parameters, centrifugation force and alkaline concentration, can directly control the diameters and lengths of nanowires. Experimental Preparation of nanowiresIron(III) chloride hexahydrate and iron(II) chloride tetrahydrate were purchased from Merck Co. and used as received. Iron oxide

Mechanisms of enhanced osteoblast gene expression in the presence of hydroxyapatite coated iron oxide magnetic nanoparticles

“…The XPS of Fe from Fe 3 O 4 samples demonstrated the existence of Fe 2p 1/2 and Fe 2p 3/2 peaks at 724 eV and 711.5 eV, respectively, which were close to the standard data of Fe 3 O 4 (figure 3(a)) [22]. The absence of a satellite peak at 718 eV indicated that the nanoparticles were actually Fe 3 O 4 , and not γ -Fe 2 O 3 , a common phase of iron oxide that shares nearly identical XRD patterns with Fe 3 O 4 (figure 3(a), inlet) [23]. A small but present Cl peak was observed, which may be from the excess iron chloride, but did not adversely influence cell responses and, thus, will require further investigation.…”

Nanocellulose-Assisted Formation of Porous Hematite Nanostructures

“…Recent studies on the preparation of nanoscale iron oxide aided by cellulose have focused mainly on composite materials. − In these publications, cellulose of different origins acts as a supporting matrix for the formation of iron oxide and as a filler for the homogeneous distribution of presynthesized crystalline nanospecies. Other biomaterials have been shown to assist in the nanofabrication of iron oxide, such as silk, chitosan, − chitin, proteins, yeast cells, and butterfly wings . A few publications describing the fabrication of porous hematite morphologies aided by sacrificial cellulose templating − deal only with macroscopic cellulose-based objects such as wood, filter paper, or fibers fabricated from regenerated cellulose.…”

Photocatalytic activity of ɑ-Fe2O3 synthesized by sol-gel method using cellulose nanocrystals as sacrificial template

“…Trong các nghiên cứu này, cellulose từ các nguồn khác nhau ngoài việc đóng vai trò như một giá thể cho sự hình thành oxit sắt còn được xem như như một chất độn cho sự phân bố đồng thể của các cấu trúc nano tinh thể trước khi tổng hợp. Các vật liệu sinh học khác cũng đã được sử dụng làm giá mang trong việc chế tạo nano oxit sắt, như tơ tằm 25 , chitosan [26][27][28] , chitin 29 , protein 30 , nấm men 31 và cánh bướm 32 . Một vài các nghiên cứu đã công bố quá trình chế tạo các hematite xốp trên các giá mang là cellulose [33][34][35]…”