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Layer-by-layer modification of high surface curvature nanoparticles with weak polyelectrolytes using a multiphase solvent precipitation process

Ashvin T. Nagaraja, Yil-Hwan You, Jeong-Wan Choi, Jin-Ha Hwang, Kenith Meissner, Michael J. McShane

Journal of Colloid and Interface Science, Volume: 466, Pages: 432 - 441

Swansea University Author: Kenith Meissner

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DOI (Published version): 10.1016/j.jcis.2015.12.040

Abstract

The layer-by-layer modification of ≈5 nm mercaptocarboxylic acid stabilized gold nanoparticles was studied in an effort to illustrate effective means to overcome practical issues in handling and performing surface modification of such extremely small materials. To accomplish this, each layer deposit...

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Published in: Journal of Colloid and Interface Science
Published: 2016
Online Access: http://www.sciencedirect.com/science/article/pii/S0021979715304240
URI: https://cronfa.swan.ac.uk/Record/cronfa27489
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first_indexed 2016-04-28T01:13:15Z
last_indexed 2019-08-01T21:20:41Z
id cronfa27489
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spelling 2019-08-01T16:45:16.4235814 v2 27489 2016-04-27 Layer-by-layer modification of high surface curvature nanoparticles with weak polyelectrolytes using a multiphase solvent precipitation process 30fdfec0d8b19b59b57a818e054d4af3 Kenith Meissner Kenith Meissner true false 2016-04-27 FGSEN The layer-by-layer modification of ≈5 nm mercaptocarboxylic acid stabilized gold nanoparticles was studied in an effort to illustrate effective means to overcome practical issues in handling and performing surface modification of such extremely small materials. To accomplish this, each layer deposition cycle was separated into a multi-step process wherein solution pH was controlled in two distinct phases of polyelectrolyte adsorption and centrifugation. Additionally, a solvent precipitation step was introduced to make processing more amenable by concentrating the sample and exchanging solution pH before ultracentrifugation. The pH-dependent assembly on gold nanoparticles was assessed after each layer deposition cycle by monitoring the plasmon peak absorbance location, surface charge, and the percentage of nanoparticles recovered. The selection of solution pH during the adsorption phase was found to be a critical parameter to enhance particle recovery and maximize surface charge when coating with weak polyelectrolytes. One bilayer was deposited with a high yield and the modified particles exhibited enhanced colloidal stability across a broad pH range and increased ionic strength. These findings support the adoption of this multi-step processing approach as an effective and generalizable approach to improve stability of high surface curvature particles. Journal Article Journal of Colloid and Interface Science 466 432 441 15 3 2016 2016-03-15 10.1016/j.jcis.2015.12.040 http://www.sciencedirect.com/science/article/pii/S0021979715304240 COLLEGE NANME Science and Engineering - Faculty COLLEGE CODE FGSEN Swansea University 2019-08-01T16:45:16.4235814 2016-04-27T16:55:35.1696358 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Ashvin T. Nagaraja 1 Yil-Hwan You 2 Jeong-Wan Choi 3 Jin-Ha Hwang 4 Kenith Meissner 5 Michael J. McShane 6
title Layer-by-layer modification of high surface curvature nanoparticles with weak polyelectrolytes using a multiphase solvent precipitation process
spellingShingle Layer-by-layer modification of high surface curvature nanoparticles with weak polyelectrolytes using a multiphase solvent precipitation process
Kenith Meissner
title_short Layer-by-layer modification of high surface curvature nanoparticles with weak polyelectrolytes using a multiphase solvent precipitation process
title_full Layer-by-layer modification of high surface curvature nanoparticles with weak polyelectrolytes using a multiphase solvent precipitation process
title_fullStr Layer-by-layer modification of high surface curvature nanoparticles with weak polyelectrolytes using a multiphase solvent precipitation process
title_full_unstemmed Layer-by-layer modification of high surface curvature nanoparticles with weak polyelectrolytes using a multiphase solvent precipitation process
title_sort Layer-by-layer modification of high surface curvature nanoparticles with weak polyelectrolytes using a multiphase solvent precipitation process
author_id_str_mv 30fdfec0d8b19b59b57a818e054d4af3
author_id_fullname_str_mv 30fdfec0d8b19b59b57a818e054d4af3_***_Kenith Meissner
author Kenith Meissner
author2 Ashvin T. Nagaraja
Yil-Hwan You
Jeong-Wan Choi
Jin-Ha Hwang
Kenith Meissner
Michael J. McShane
format Journal article
container_title Journal of Colloid and Interface Science
container_volume 466
container_start_page 432
publishDate 2016
institution Swansea University
doi_str_mv 10.1016/j.jcis.2015.12.040
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
url http://www.sciencedirect.com/science/article/pii/S0021979715304240
document_store_str 0
active_str 0
description The layer-by-layer modification of ≈5 nm mercaptocarboxylic acid stabilized gold nanoparticles was studied in an effort to illustrate effective means to overcome practical issues in handling and performing surface modification of such extremely small materials. To accomplish this, each layer deposition cycle was separated into a multi-step process wherein solution pH was controlled in two distinct phases of polyelectrolyte adsorption and centrifugation. Additionally, a solvent precipitation step was introduced to make processing more amenable by concentrating the sample and exchanging solution pH before ultracentrifugation. The pH-dependent assembly on gold nanoparticles was assessed after each layer deposition cycle by monitoring the plasmon peak absorbance location, surface charge, and the percentage of nanoparticles recovered. The selection of solution pH during the adsorption phase was found to be a critical parameter to enhance particle recovery and maximize surface charge when coating with weak polyelectrolytes. One bilayer was deposited with a high yield and the modified particles exhibited enhanced colloidal stability across a broad pH range and increased ionic strength. These findings support the adoption of this multi-step processing approach as an effective and generalizable approach to improve stability of high surface curvature particles.
published_date 2016-03-15T03:33:19Z
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score 11.013148

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