| Summary: | 碩士 === 國立虎尾科技大學 === 光電與材料科技研究所 === 103 === 1.A new derivative morphology of pheophytin was proposed and supported by spectral comparison and experimental verification. In short, when in the presence of an entering hydrogen gas molecule (or a proton pair, after their electrons were stripped by external means), a lower-energy structure of pheophytin existed wherein each nitrogen atom on its porphyrin ring was saturated with N–H bond. That is, the originally two double bonds associated with the two N atoms became single bonds, and all adjacent carbon atoms became carrying formal charge +1 and thus possessing only three bonds. Such a low-energy structure was found to constitute a general purpose proton traverse path, especially in a pheophytin-catalyzed hydrogen decomposition process.
2.By way of 1st-principle quantum simulations, the site with nitrogen atoms within the porphyrin ring of a pheophytin was suspected to be capable of adsorbing hydrogen molecules. Experiments were thus conducted to verify such speculation. In a hydrogen gas filled space, both samples of the control and experimental groups were installed, with the former being only thirty pieces of calligraphy papers spanning an area of about 3000cm2, and the latter being such papers deposited with pheophytin. Under room temperature and pressure, the installed hydrogen gas sensor indicated that in the control group, hydrogen gas content varied little, diminishing only 0.42% in 24 hours, while in the experimental group a total of 1.12 mmol floating hydrogen was decreased, equivalent to an adsorption rate of about 46 μmole H2 / hr. On the front of hydrogen gas release, samples with adsorbed hydrogen were heated to release H2. With gradually increased temperature steps per 3 hours at 25, 36, 48, 60 ℃, respectively, the rate of release were found to be about 26, 62, and 114 μmole/hr, respectively. A high slope in the hydrogen release rate was spotted to be at about 48 ℃. Overall, the net release fraction was about 35% of the originally adsorbed quantity.
3.Currently, most known magnet-based power generating devices are relying on the relative movement of magnetic flux and sensing coils, which provides the desired electromotive force first and then capacitors are made ready to stored thus generated power. However, this energy harvesting process ceases when the external mechanical work is no long supplied. In this research, a methodology is realized and presented in which the above energy harvesting continues even after the stoppage of external oscillation. Namely, a self-winding mechanism with a magnetic oscillating hammer was designed and a prototype made to verify the practicality of such idea.
In the conducted experiment, the oscillator hammer and gear assembly were designed and made using 3D printing machine. With NdFeB magnet of the size diameter = 15mm, thickness = 2.5mm, and coil of the size: diameter = 16mm, thickness = 5mm, the output power of 7.7 mW was obtained.
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