The Development and Characterization of Double Layer Hydrogel for Agricultural and Horticultural Applications

Bibliographic Details
Main Author:	Kim, Sangjoon
Language:	English
Published:	University of Toledo / OhioLINK 2010
Subjects:	Agricultural Chemicals Agricultural Engineering Chemical Engineering Polyacrylamide hydrogel Dehydration Swelling Mechanical property Ionic hydrogel Double layer hydroel Polyurethane Coating Coated hydrogel Dehydration simulation Diffusion
Online Access:	http://rave.ohiolink.edu/etdc/view?acc_num=toledo1279116187

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spelling	ndltd-OhioLink-oai-etd.ohiolink.edu-toledo12791161872021-08-03T06:07:48Z The Development and Characterization of Double Layer Hydrogel for Agricultural and Horticultural Applications Kim, Sangjoon Agricultural Chemicals Agricultural Engineering Chemical Engineering Polyacrylamide hydrogel Dehydration Swelling Mechanical property Ionic hydrogel Double layer hydroel Polyurethane Coating Coated hydrogel Dehydration simulation Diffusion This research aimed to develop hydrogels for agricultural and horticultural application. The most remarkable characteristic of hydrogels is their ability to absorb large amounts of aqueous solutions, such as pure water and nutrient solution. They could make plants grow at optimal environments as the release of water and nutrients is controlled into soils. The advantages not only keeps continuous optimal environment but also reduces the use of freshwater and associates labor cost, being compared to directly sprinkling water to plants. Currently, commercial hydrogels are being produced from these hydrogel advantages. However, there are a few drawbacks. Firstly, while these hydrogels can rapidly absorb large amounts of water, they also dehydrate very rapidly in a matter of hours. Secondly, they are fragile and break apart easily losing their water retention properties. In this study, we tried to overcome the weakness of commercial hydrogels.We researched the dehydration and mechanical characteristics of various types of hydrogels, such as pure hydrogels and ionic hydrogels. Based on these studies, we designed a double layer PAAm-based hydrogel to overcome the inherent weakness of pure and ionic hydrogels which are kinds of commercial hydrogels. The inner layer gel consists of soft, low crosslinked PAAm which retains the high water absorbing property, ensuring its ability is to supply sufficient water, while the outer layer is made up of either highly crosslinked PAAm or polyurethane (PU), providing low aqueous permeability and high mechanical strength. The dehydration rates of PU-PAAm double layer hydrogels could be controlled by the pore sizes of PU coating layer determined by the molecular weight of polyethylene glycol and by the thickness of coating layer. In addition, the cross-linking density of inner gel and the temperature of coating solution affected the dehydration rate of PU-PAAm double layer hydrogels. Such a double layer design resulted in mechanical stability for deployment in soils as well as continuous dehydration time over a week at a room atmosphere and nutrients release until one week in DI water. 2010-09-10 English text University of Toledo / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=toledo1279116187 http://rave.ohiolink.edu/etdc/view?acc_num=toledo1279116187 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection	NDLTD
language	English
sources	NDLTD
topic	Agricultural Chemicals Agricultural Engineering Chemical Engineering Polyacrylamide hydrogel Dehydration Swelling Mechanical property Ionic hydrogel Double layer hydroel Polyurethane Coating Coated hydrogel Dehydration simulation Diffusion
spellingShingle	Agricultural Chemicals Agricultural Engineering Chemical Engineering Polyacrylamide hydrogel Dehydration Swelling Mechanical property Ionic hydrogel Double layer hydroel Polyurethane Coating Coated hydrogel Dehydration simulation Diffusion Kim, Sangjoon The Development and Characterization of Double Layer Hydrogel for Agricultural and Horticultural Applications
author	Kim, Sangjoon
author_facet	Kim, Sangjoon
author_sort	Kim, Sangjoon
title	The Development and Characterization of Double Layer Hydrogel for Agricultural and Horticultural Applications
title_short	The Development and Characterization of Double Layer Hydrogel for Agricultural and Horticultural Applications
title_full	The Development and Characterization of Double Layer Hydrogel for Agricultural and Horticultural Applications
title_fullStr	The Development and Characterization of Double Layer Hydrogel for Agricultural and Horticultural Applications
title_full_unstemmed	The Development and Characterization of Double Layer Hydrogel for Agricultural and Horticultural Applications
title_sort	development and characterization of double layer hydrogel for agricultural and horticultural applications
publisher	University of Toledo / OhioLINK
publishDate	2010
url	http://rave.ohiolink.edu/etdc/view?acc_num=toledo1279116187
work_keys_str_mv	AT kimsangjoon thedevelopmentandcharacterizationofdoublelayerhydrogelforagriculturalandhorticulturalapplications AT kimsangjoon developmentandcharacterizationofdoublelayerhydrogelforagriculturalandhorticulturalapplications
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The Development and Characterization of Double Layer Hydrogel for Agricultural and Horticultural Applications

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