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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 洪惠敏 | |
dc.contributor.author | Ting-Wei Ou | en |
dc.contributor.author | 歐庭維 | zh_TW |
dc.date.accessioned | 2021-06-16T08:26:23Z | - |
dc.date.available | 2016-03-18 | |
dc.date.copyright | 2014-03-18 | |
dc.date.issued | 2014 | |
dc.date.submitted | 2014-01-20 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/58700 | - |
dc.description.abstract | 本研究利用實驗及模擬的方式,探討不同波段(185 nm & 254 nm)的紫外光及氣流中添加不同氣體,對於光化反應和產生新粒子現象的影響,實驗所產生的粒子使用掃描式電動度粒徑分析儀(SMPS)進行粒子的粒徑、數量進行測量。實驗結果顯示,本研究中要產生新粒子必須要有OH自由基存在才行,此外,沒有水氣或沒有提供紫外光皆無法產生粒子。當相對濕度上升時,由於OH自由基產量上升,使得新生粒子的總數量、總體積增加。然而,添加臭氧、過氧化氫、甲醇等氣體於氣流中卻觀察到新粒子的數量、體積有減少的現象。藉由模擬實驗中包含的光化反應及氧化反應得知,實驗產生新粒子的現象可能與硫酸、甲醇的生成有關。當相對濕度上升時,硫酸與甲醇的產量增加,產生的硫酸及甲醇最高分別為濃度為0.12 ppb、0.45 ppb。於氣流中添加臭氧的模擬則得知硫酸的產量維持不變0.12 ppb,但甲醇的產量隨臭氧濃度增加而減少至5.38 ppt。添加過氧化氫的模擬中,過氧化氫濃度增加至1.78 ppm開始有明顯的影響,當添加的過氧化氫濃度超過1.78 ppm後,硫酸與甲醇的產量有明顯的下降。添加甲醇於氣流中的模擬則得知,添加甲醇的濃度超過17.86 ppm後,由於甲醇會消耗OH自由基,使得硫酸的產量下降。因此,本研究觀察到粒子生成的現象可能與硫酸與有機物質例如甲醇的生成有關。 | zh_TW |
dc.description.abstract | The effect of different wavelengths (λ=184.9 nm and λ=254 nm) and carrier gases on particle nucleation via. photochemical reactions nucleation were investigated using a flow tube and a scanning mobility particle sizer (SMPS) to measure the size-number distribution of new particles. The experimental results suggested that the new particle formation in our study only happened with presence of hydroxyl radical (OH). The total number and volume of new particles increased with relative humidity (RH) due to more OH production. However, the new particle production significantly decreased when extra ozone or hydrogen peroxide (H2O2) or methanol was added into the flow. The simulation composed with various chemical reactions including photolysis and oxidation reactions, suggested that new particle formation is related to the concentration of produced H2SO4 and methanol. At higher RH and the provided light source, the overall concentration of H2SO4 and methanol reached the maximum concentration 0.12 ppb and 0.45 ppb. As the ozone concentration was increased, H2SO4 was at maximum concentration but methanol was decreased to5.38 ppt. When extra H2O2 was added into the system, the simulation showed no significant product variation until [H2O2] > 1.78 ppm. At [H2O2] >1.78 ppm, H2SO4 and methanol were significantly decreased. If CH3OH was added into the flow, it consumed most OH and lead to lower H2SO4. Overall, the new particle formation in this study is likely associated with the formation of H2SO4 and possible organic species such as methanol. | en |
dc.description.provenance | Made available in DSpace on 2021-06-16T08:26:23Z (GMT). No. of bitstreams: 1 ntu-103-R00229018-1.pdf: 3261784 bytes, checksum: 55b64e645296dc7ae3207c1e6c370372 (MD5) Previous issue date: 2014 | en |
dc.description.tableofcontents | 口試委員會審定書…………………………………………………………………………….i
誌謝 ii 摘要 iii Abstract iv 目錄 v 圖目錄 vii 表目錄 x 1-1研究動機 1 1-2研究目的 2 第二章 實驗觀測與核化理論 4 2-1.核化現象的實驗室研究 4 2-2.環境觀測到核化現象的文獻 5 2-3.核化理論 8 第三章 研究方法 10 3-1 實驗裝置 10 3-1.1氣體供應 10 3-1.2相對溼度、臭氧、添加氣體的控制裝置 11 3-1.3光化反應裝置 12 3-1.4 粒子量測系統 13 3-2添加氣體的定量方法 15 3-3 光化反應模擬機制 16 第四章 實驗結果與討論 18 4-1光化反應產生粒子 18 4-1.1光源的影響 19 4-2添加氣體的影響 20 4-2.1 過氧化氫 21 4-2.2相對溼度 22 4-2.3臭氧 23 4-2.4甲醇 25 4-2.5 氨氣及二甲胺 25 實驗部分小結 26 4-3 數值模擬結果 27 第五章 結論與未來展望 31 5-1 結論 31 5-2 未來展望 32 參考文獻 34 附圖 38 附表 51 | |
dc.language.iso | zh-TW | |
dc.title | 紫外光誘發粒子生成現象之探討 | zh_TW |
dc.title | A Study of Particle Formation Induced by UV Irradiation | en |
dc.type | Thesis | |
dc.date.schoolyear | 102-1 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 陳正平,周崇光 | |
dc.subject.keyword | 紫外光,OH自由基,相對溼度,臭氧,過氧化氫,甲醇, | zh_TW |
dc.subject.keyword | UV light,OH radical,relative humidity,ozone,hydrogen peroxide,methanol, | en |
dc.relation.page | 63 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2014-01-21 | |
dc.contributor.author-college | 理學院 | zh_TW |
dc.contributor.author-dept | 大氣科學研究所 | zh_TW |
顯示於系所單位: | 大氣科學系 |
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