Long-range attractive forces extending from the alumina’s nanolayer surface in aqueous solutions

Aluminum oxide-hydroxide nanolayer with a thickness of approximately 1.2 nm is electroadhesively deposited onto silicious support material with large surface area of about 50 m2/g, forming a highly electropositive composite of boehmite nanolayer in the form of monocrystalline oxide/hydroxide (α-Al2O...

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Main Authors: Leonid A. Kaledin, Fred Tepper, Tatiana G. Kaledin
Format: Article
Language:English
Published: Taylor & Francis Group 2015-07-01
Series:International Journal of Smart and Nano Materials
Subjects:
Online Access:http://dx.doi.org/10.1080/19475411.2015.1095254
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spelling doaj-55d0736063ad4ef0bf9466565671501b2020-11-24T21:01:30ZengTaylor & Francis GroupInternational Journal of Smart and Nano Materials1947-54111947-542X2015-07-016317119410.1080/19475411.2015.10952541095254Long-range attractive forces extending from the alumina’s nanolayer surface in aqueous solutionsLeonid A. Kaledin0Fred Tepper1Tatiana G. Kaledin2Argonide Corporation, Nanomaterial & Filtration TechnologiesArgonide Corporation, Nanomaterial & Filtration TechnologiesArgonide Corporation, Nanomaterial & Filtration TechnologiesAluminum oxide-hydroxide nanolayer with a thickness of approximately 1.2 nm is electroadhesively deposited onto silicious support material with large surface area of about 50 m2/g, forming a highly electropositive composite of boehmite nanolayer in the form of monocrystalline oxide/hydroxide (α-Al2O3·H2O) on the second electronegative solid. The composite can be viewed as a sphere with a rough surface and charge density of approximately 0.08 C/m2. This creates a significant electric field with negligible screening (ka ≪ 1) in the region close to the surface of the nanocomposite. This field attracts nano- and micron-sized particles from as far as 200 μm in a few seconds, many orders of magnitude greater than conventional Derjaguin–Landau–Verwey–Overbeek (DLVO) theory, which predicts only nanometer-scale effects arising from the presence of the surface. The strong electric field on the surface is then able to retain small particles such as viruses, atomically thin sheets of graphene oxide, RNA, DNA, proteins, dyes as well as heavy metals such as cobalt, arsenic, and lead. Alumina’s nanolayer surface can be further functionalized by adding other sub-micron or nano-sized particles to target a specific contaminant. An example is shown where alumina nanolayer is coated with nano-sized iron monohydrate to yield an arsenic sorbent that shows high sorption capacity.http://dx.doi.org/10.1080/19475411.2015.1095254alumina nanolayerelectric double layerelectrostatic adsorption
collection DOAJ
language English
format Article
sources DOAJ
author Leonid A. Kaledin
Fred Tepper
Tatiana G. Kaledin
spellingShingle Leonid A. Kaledin
Fred Tepper
Tatiana G. Kaledin
Long-range attractive forces extending from the alumina’s nanolayer surface in aqueous solutions
International Journal of Smart and Nano Materials
alumina nanolayer
electric double layer
electrostatic adsorption
author_facet Leonid A. Kaledin
Fred Tepper
Tatiana G. Kaledin
author_sort Leonid A. Kaledin
title Long-range attractive forces extending from the alumina’s nanolayer surface in aqueous solutions
title_short Long-range attractive forces extending from the alumina’s nanolayer surface in aqueous solutions
title_full Long-range attractive forces extending from the alumina’s nanolayer surface in aqueous solutions
title_fullStr Long-range attractive forces extending from the alumina’s nanolayer surface in aqueous solutions
title_full_unstemmed Long-range attractive forces extending from the alumina’s nanolayer surface in aqueous solutions
title_sort long-range attractive forces extending from the alumina’s nanolayer surface in aqueous solutions
publisher Taylor & Francis Group
series International Journal of Smart and Nano Materials
issn 1947-5411
1947-542X
publishDate 2015-07-01
description Aluminum oxide-hydroxide nanolayer with a thickness of approximately 1.2 nm is electroadhesively deposited onto silicious support material with large surface area of about 50 m2/g, forming a highly electropositive composite of boehmite nanolayer in the form of monocrystalline oxide/hydroxide (α-Al2O3·H2O) on the second electronegative solid. The composite can be viewed as a sphere with a rough surface and charge density of approximately 0.08 C/m2. This creates a significant electric field with negligible screening (ka ≪ 1) in the region close to the surface of the nanocomposite. This field attracts nano- and micron-sized particles from as far as 200 μm in a few seconds, many orders of magnitude greater than conventional Derjaguin–Landau–Verwey–Overbeek (DLVO) theory, which predicts only nanometer-scale effects arising from the presence of the surface. The strong electric field on the surface is then able to retain small particles such as viruses, atomically thin sheets of graphene oxide, RNA, DNA, proteins, dyes as well as heavy metals such as cobalt, arsenic, and lead. Alumina’s nanolayer surface can be further functionalized by adding other sub-micron or nano-sized particles to target a specific contaminant. An example is shown where alumina nanolayer is coated with nano-sized iron monohydrate to yield an arsenic sorbent that shows high sorption capacity.
topic alumina nanolayer
electric double layer
electrostatic adsorption
url http://dx.doi.org/10.1080/19475411.2015.1095254
work_keys_str_mv AT leonidakaledin longrangeattractiveforcesextendingfromthealuminasnanolayersurfaceinaqueoussolutions
AT fredtepper longrangeattractiveforcesextendingfromthealuminasnanolayersurfaceinaqueoussolutions
AT tatianagkaledin longrangeattractiveforcesextendingfromthealuminasnanolayersurfaceinaqueoussolutions
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