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Advanced glucose biosensing and nano...

Uba, Humphreys Douglas I.

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Advanced glucose biosensing and nano-composite research.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Advanced glucose biosensing and nano-composite research./
作者:	Uba, Humphreys Douglas I.
面頁冊數:	118 p.
附註:	Source: Dissertation Abstracts International, Volume: 72-05, Section: B, page: .
Contained By:	Dissertation Abstracts International72-05B.
標題:	Health Sciences, Toxicology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3447359
ISBN:	9781124516912

Advanced glucose biosensing and nano-composite research.
Uba, Humphreys Douglas I.

Advanced glucose biosensing and nano-composite research. - 118 p.

Source: Dissertation Abstracts International, Volume: 72-05, Section: B, page: .

Thesis (Ph.D.)--Texas Southern University, 2009.

The fascinating and enhanced properties of carbon nanotubes (CNTs) have been of intense interest since their discovery. This is primarily due to their exceptional mechanical , electrical, and thermal properties , as well as their many and varied applications in modern industries such as in fuel cells, sensors, reinforced composites, electromagnetic interference shielding applications, actuators and fabrication of sophisticated nanostructures.

ISBN: 9781124516912Subjects--Topical Terms:

1017752
Health Sciences, Toxicology.

Advanced glucose biosensing and nano-composite research.
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500 $a Source: Dissertation Abstracts International, Volume: 72-05, Section: B, page: .
500 $a Adviser: Xin Wei.
502 $a Thesis (Ph.D.)--Texas Southern University, 2009.
520 $a The fascinating and enhanced properties of carbon nanotubes (CNTs) have been of intense interest since their discovery. This is primarily due to their exceptional mechanical , electrical, and thermal properties , as well as their many and varied applications in modern industries such as in fuel cells, sensors, reinforced composites, electromagnetic interference shielding applications, actuators and fabrication of sophisticated nanostructures.
520 $a During the production of CNTs, there are associated impurities such as metal nanoparticle and carbonaceous impurities. There are different types of CNTs such as single-walled nanotubes (SWNTs), double-walled nanotubes (DWNTs) and multi-walled nanotubes (MWNTs). In this study, XD-grade CNTs (XD) was used. XD is a mixture of SWNTs, DWNTs and MWNTs. The focus of this study was primarily geared toward the purification and application of CNTs. Two generally accepted cycles of purification were followed, purification under oxygen environment and purification under oxygen/argon mixture environment. XD was purified to different extents by oxidation and acid wash.
520 $a The raw and purified CNTs were compounded into Epikote 862 and Epikure W epoxy resin to prepare composite materials and also in the biosensor studies. The CNTs and composite materials were characterized by means of thermal gravimetric analysis (TGA), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and transimssion electron microscopy (TEM).
520 $a It was discovered that, excessive purification would not lead to further removal of metal residues; instead, it could result in disruption of the structure and property of CNTs. The use of CNTs as fillers was found to hinder the epoxy curing in general, and the removal of metal impurities seemed to worsen the situation. This would imply that the metal residue might catalyze the epoxy curing to a certain degree while the increased viscosity should be the primary reason for the slowed curing.
520 $a An electrochemical biosensor is an analytical device that can convert a biological reaction into a current or voltage signal. A biosensor consists of a biological element that is immobilized on a film and connected to a transducer. The reaction occurs at the film where the substrate of interest is converted to a product that causes an electrical response. The response is measured by the transducer and then amplified, processed and displayed by a meter and a computer with laboratory data acquisition system. Amperometric biosensors function by monitoring the current when a constant potential is applied on the working electrode. The performances of the biosensor are evaluated by their response time, dynamic ranges and sensitivity. Response should be prompt, accurate, replicable, linear over a broad analytical range, with a reasonable recovery time, and a long working life time.
520 $a Purification of the CNTs led to the opening and functionalization by oxidation of the nanotube array which may provide increased surface area for the immobilization of the enzyme, glucose oxidase. The platinum substrate provided the direct transduction platform for signal monitoring. GDI-modified (glutarate dialdehyde) chitosan played the role of an immobilization matrix. Hopefully, this research will further lead to the development of third generation biosensor system by using the CNT to directly link the electrode surface and the redox center in the enzyme molecule where superb selectivity and complete oxygen independence can be expected.
590 $a School code: 0441.
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650 4 $a Environmental Sciences. $3 676987
650 4 $a Engineering, Materials Science. $3 1017759
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710 2 $a Texas Southern University. $3 1035309
773 0 $t Dissertation Abstracts International $g 72-05B.
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