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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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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