Characterization of thermally stable gamma alumina fibres biomimicking sisal

Benítez‐Guerrero, Mónica; Pérez‐Maqueda, Luis A.; Jiménez, Pilar; Pascual‐Cosp, José

doi:10.1016/j.micromeso.2013.11.012

Cited by 21 publications

(8 citation statements)

References 72 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…5 a, the peaks at 531.90, 531.85, 531.15, 531.20, and 532.00 eV are attributed to the undoped, Cr-doped, Fe-doped, and Mg-doped alumina nanorods and the sample prepared from the chromium-containing alumina sludge, respectively. The peaks are assigned to O 2− of the Al 2 O 3 [ 31 ]. Figure 5 b shows the peaks at 74.00, 74.25, 74.75, 74.38, and 73.90 eV of Al 2 p are attributed to the above samples, respectively.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Alumina Nanorods from Chromium-Containing Alumina Sludge

Zhang

Deng²,

Sun

et al. 2017

Nanoscale Res Lett

View full text Add to dashboard Cite

Alumina nanorods were prepared from chromium-containing alumina sludge, and the effects of doping elements, such as Cr, Fe, and Mg, were researched. The results show that the crystal transformation of alumina is restricted by the doped Cr and facilitated by the doped Fe and Mg, which is transformed from θ-Al2O3 to α-Al2O3 in the calcination process. Meanwhile, the crystal transformation of alumina is strongly restrained by co-doped elements from the chromium-containing alumina sludge. The doped elements change the course of phase structure transformation and slightly transform the chemical bond of the alumina nanorods. The impure elements are doped in the alumina crystal and restrain the crystalline growth of alumina nanorods according to the rules. In the sample prepared from chromium-containing alumina sludge, more Cr and Mg but fewer Fe are doped, and most Cr are existed as Cr(III). It is possible that the Fe-doping is confined by the competition of Cr and Mg. Moreover, the lattice imperfection of alumina is caused by doped ions, such as Cr, Fe, and Mg, and the chemical state of O and Al are affected. The findings by these experiments provide essential information for eliminating pollution and promoting comprehensive utilization of the chromium-containing alumina sludge.

show abstract

Section: Resultsmentioning

confidence: 99%

Preparation of Alumina Nanorods from Chromium-Containing Alumina Sludge

Zhang

Deng²,

Sun

et al. 2017

Nanoscale Res Lett

View full text Add to dashboard Cite

show abstract

“…A number of materials applying as a template are described in the literature. Most of the templates are biopolymers [7,[10][11][12][13] and synthetic fibers [14,15], including those obtained by electro-spinning method [16,17]. On the other hand, nanostructured carbon materials of different morphology can also be considered as alternative ones [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Sol–gel template preparation of alumina nanofillers for reinforcing the epoxy resin

Krivoshapkin

Mishakov

Krivoshapkina

et al. 2016

J Sol-Gel Sci Technol

View full text Add to dashboard Cite

Alumina nanofibers were prepared by sol-gel template method. Carbon nanofibers (CNFs) of feather-like morphology obtained by chemical vapor deposition of C 2 -C 4 hydrocarbons mixture have been used as a template. The distinctive feature of CNF is a friable disordered structure consisting of separate fragments of graphite-like phase. To simplify the sol-gel synthetic procedure, the impact of preparative conditions such as type of precursor and ratio of starting components was studied. CNFs were coated with corresponding alumina precursor and subjected to a high temperature treatment. The resulted alumina nanofibers were explored by means of scanning electron microscopy (SEM), physical nitrogen adsorption (BET), and X-ray diffraction. The optimal Al 2 O 3 :CNF ratio was found to be 1:6. According to SEM and BET, surface area of prepared alumina fibers 70-90 nm in diameter lies in a range of 149-174 m 2 /g. The thermal and strength properties of epoxy composites reinforced with alumina nanofibers are compared. It was demonstrated that used nanofillers affect noticeably the properties of the epoxy matrix. Graphical Abstract

show abstract

“…Moreover, because biological organisms possess multi-level and multi-dimensional structures with specific functionalities developed for adaptation to environmental conditions, the obtained bionic materials by replicating endow with unique structural and surface properties [11], which is difficult to get by conventional methods [12]. Up to now, some biomass such as silk [13], butterfly wings [14], Eggshell membrane [15], sisal fibers [16] and even plant skins [17], etc. have been used as biological templates for the preparation of biomorphic porous alumina and metal oxides.…”

Section: Introductionmentioning

confidence: 99%