Browsing by Author "Su, Chien-Ying"

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Laser induced popcornlike conformational transition of nanodiamond as a nanoknife
(2008-07-21)
Chang, Chia-Ching
;
Chen, Pei-Hsin
;
Chu, Hsueh-Liang
;
Lee, Tzu-Cheng
;
Chou, Ching-Chung
Nanodiamond (ND) is surrounded by layers of graphite on its surface. This unique structure feature creates unusual fluorescence spectra, which can be used as an indicator to monitor its surface modification. Meanwhile, the impurity, nitroso (C - N = O) inside the ND can be photolyzed by two-photon absorption, releasing NO to facilitate the formation of a sp(3) diamond structure in the core of ND and transforming it into a sp(2) graphite structure. Such a conformational transition enlarges the size of ND from 8 to 90 nm, resulting in a popcornlike structure. This transition reaction may be useful as nanoknives in biomedical application. (c) 2008 American Institute of Physics.
Novel photo-dynamic caner therapy strategy development by nanodiamond-protein complex.
(2007-04-01)
Chen, Pei-Hsin
;
Chiang, Ke-Yu
;
Chang, Yu-Ching
;
Su, Chien-Ying
;
Chen, Kyh-Shin
Stable inverted bottom-emitting organic electroluminescent devices with molecular doping and morphology improvement
(2006-07-31)
Chen, Szu-Yi
;
Chu, Ta-Ya
;
Chen, Jenn-Fang
;
Su, Chien-Ying
;
Chen, Chin H.
Stable inverted bottom-emitting organic light-emitting diodes (IBOLEDs) have been investigated by inserting n-type Cs2O dopant between indium-tin oxide bottom cathode and Alq(3), the combination of which not only improved the morphology of organic layer but enhanced the lifetime of the IBOLED. This n-type doped IBOLED achieved efficiencies of 5.2 cd/A and 2.0 lm/W at 20 mA/cm(2). The 20% decay lifetime (t(80)) of Cs2O doped IBOLED is 270 h which is about 1.7 times more stable than that of the conventional OLED (160 h) and 2.5 times of Li doped IBOLED (104 h). (c) 2006 American Institute of Physics.
Surface Reaction Limited Model for the Evaluation of Immobilized Enzyme on Planar Surfaces
(2009-04-01)
Lee, Cheng-Che
;
Chiang, Han-Ping
;
Li, Kun-Lin
;
Ko, Fu-Hsiang
;
Su, Chien-Ying
Analysis of immobilized enzyme in situ is a crucial step to embed an enzyme onto the planar technology of standard integrated circuit (IC) and microelectromechanical systems (MEMS) for a bioreactor or enzyme-coupled biosensor. A surface reaction limited model, based on a systematized and standardized approach, mathematically derived from mass transfer dynamics and the Michaelis-Menten equation for the measuring the apparent K(m)(star) (Michaelis-Menten constant) and V(max)(star) (maximum reaction rate per unit surface area of catalyst) of an immobilized enzyme on a planar surface was developed. The derived equations for the kinetic model were simulated and experimentally confirmed. A platform of a microflow bioreactor with a one-sided planar catalytic surface that contained immobilized enzyme was constructed. The microfluidic bioreactor was designed to possess a channel height less than that of the diffusion layer thickness in a semi-infinite diffusion process, and K(m)(star) and V(max)(star) of rat phenol sulfotransferase (PST) immobilized on the silicon oxide surface were successfully determined in situ. Variation in kinetic constants and the possible differences in performance between free and immobilized PST are discussed.