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Adhesion Characteristics and Swellin...

Benjamin, Chandler.

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Adhesion Characteristics and Swelling Response of Stimuli-Responsive Hydrogels.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Adhesion Characteristics and Swelling Response of Stimuli-Responsive Hydrogels./
作者:	Benjamin, Chandler.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2017,
面頁冊數:	134 p.
附註:	Source: Dissertation Abstracts International, Volume: 79-01(E), Section: B.
Contained By:	Dissertation Abstracts International79-01B(E).
標題:	Mechanics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10622386
ISBN:	9780355203868

Adhesion Characteristics and Swelling Response of Stimuli-Responsive Hydrogels.
Benjamin, Chandler.

Adhesion Characteristics and Swelling Response of Stimuli-Responsive Hydrogels. - Ann Arbor : ProQuest Dissertations & Theses, 2017 - 134 p.

Source: Dissertation Abstracts International, Volume: 79-01(E), Section: B.

Thesis (Ph.D.)--The University of Wisconsin - Madison, 2017.

Stimuli-responsive hydrogels are a class of shape memory materials that have been successfully used in microfluidic and biomedical devices and additionally as biomaterials. These materials operate in a hydrated environment and respond with a significant volumetric reversible transformation through absorption or release of water within the polymeric network. The pH sensitive 2-hydroxyethyl methacrylate (2-dimethylamino) ethyl methacrylate, (HEMA-DMAEMA) stimuli-responsive hydrogel is used in microfluidic devices as sensors and actuators. This hydrogel responds to an acidic aqueous environment with a subsequent volume change. This actuation requires the hydrogel to be in an acidic environment to remain in its swollen state.

ISBN: 9780355203868Subjects--Topical Terms:

525881
Mechanics.

Adhesion Characteristics and Swelling Response of Stimuli-Responsive Hydrogels.
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500 $a Source: Dissertation Abstracts International, Volume: 79-01(E), Section: B.
500 $a Adviser: Wendy C. Crone.
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520 $a Stimuli-responsive hydrogels are a class of shape memory materials that have been successfully used in microfluidic and biomedical devices and additionally as biomaterials. These materials operate in a hydrated environment and respond with a significant volumetric reversible transformation through absorption or release of water within the polymeric network. The pH sensitive 2-hydroxyethyl methacrylate (2-dimethylamino) ethyl methacrylate, (HEMA-DMAEMA) stimuli-responsive hydrogel is used in microfluidic devices as sensors and actuators. This hydrogel responds to an acidic aqueous environment with a subsequent volume change. This actuation requires the hydrogel to be in an acidic environment to remain in its swollen state.
520 $a In chapter 2 I initially characterize this hydrogel in terms of engineering properties such as the storage modulus G', the loss modulus G'' and loss tangent tan(delta). The storage modulus is analogous to the shear modulus from elasticity theory. The loss modulus is a representation of energy dissipation from applied loading. The loss tangent tan(delta) is a measure of damping in a material.
520 $a In chapter 3 I develop a method of measuring the Fung parameter beta° for stimuli-responsive hydrogels using a simple tensile test. HEMA-DMAEMA stimuli-responsive hydrogels are examined using this method. The HEMA-DMAEMA is pre-conditioned in 3.0 (acidic) pH and 11.0 (basic) pH buffer solutions prior to testing to compare the theoretical results to experiment in both the swollen and unswollen states. The measured Fung parameter beta° is 0.870 +/- 0.018.
520 $a In chapter 4 I examine the interfacial adhesion of HEMA-DMAEMA. Experimental observations have given indications that the adhesion of the (HEMA-DMAEMA) is effected by substrate modifications. Using a unique experimental technique coupled with concepts from fracture mechanics I measure differences in the adhesive strength of HEMA-DMAEMA on borosilicate glass substrates, both unmodified and with different surface modifications.
520 $a Together these hydrogel characteristics provide microfluidic device designers the ability to plan their designs around viscoelastic effects such as creep, relaxation, and interfacial phenomena such as adhesion.
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