氣膠的多相化學

在大氣中，氣膠隨處可見且對氣候、空氣品質與公眾健康具有深遠的影響。大氣氣膠主要來源之一是揮發性有機物的化學反應產生的二次有機氣膠。對於有機氣膠的物理與化學機制如成分組成、生成機制與反應速率的全面性了解仍是大氣化學研究中最大的挑戰之一。有機氣膠的生成包含氣相、凝相與異相反應，其中氣膠前驅物反應更與氣膠的結構特性與化學組成相互影響。為了從分子層級來解析此多樣性的反應體系，本計劃擬建構一光鑷光譜系統，並藉以探討組成氣膠的前驅分子，與相關反應在氣膠生成各階段中的角色，以及如何影響氣膠的各項特性。此系統結合光鑷與振動光譜技術，能偵測單粒子的分子光譜，物化特性與各相的動態行為。拉曼光譜與螢光相關光譜偵測氣膠的分子光譜以及物化特性。本計劃將針對氣膠化學的自然有機物氧化反應，例如臭氧化反應加以探討。本計劃希望藉此光鑷光譜系統深入解析這些反應與前驅分子在氣膠生成與演進各階段所扮演的角色，以及如何與氣膠各項性質相互耦合。

氣膠光鑷系統的實驗架設圖

https://www.youtube.com/watch?v=O4vfHF1xHQQ

捕捉到氣膠的一瞬間

Raman spectra of optically trapped NaCl(aq) aerosol, OH stretching mode and cavity-enchanced Raman scattering (CERS) signals, and its size evolution over a ~40s period. (6.10um to 6.15um)

Raman spectra of an optically trapped citric acid(aq) droplet, OH stretching mode, CH stretching mode and CERS signals, and its size evolution over a ~20s period.

Time traces of CERS signals from the optically trapped citric acid(aq) droplet.

Assignment of the CERS spectrum of the optically trapped citric acid(aq) droplet, by means of Mie theory fitting, a program developed by Preston group at McGill University. According to the fitting results, the particle size is 3.28 um.

經費來源：

科技部研究計畫 MOST 107-2113-M-110-004-MY3
中山-高醫合作計畫 NSYSUKMU 108-I002
科技部研究計畫 MOST 109-2113-M-110-010-
科技部研究計畫 MOST 110-2113-M-110-019-
科技部研究計畫 MOST 111-2113-M-110-001-
國科會研究計畫 NSTC 112-2113-M-110-011-
國科會研究計畫 NSTC 113-2113-M-110-005-
國科會大氣化學及天文化學上關鍵分子的尖端研究(II)(1/5)
中山大學氣膠科學研究中心

發表文獻：

1. "Ionic-strength and pH dependent reactivities of ascorbic acid toward ozone in aqueous micro-droplets studied by aerosol optical tweezers", Yuan-Pin Chang,* Shan-Jung Wu, Min-Sian Lin, Che-Yu Chiang and Genin Gary Huang ; Phys. Chem. Chem. Phys. 23, 10108 (2021)

2. "Micro-droplet Trapping and Manipulation: Understanding Aerosol Better for a Healthier Environment", Yuan-Pin Chang,* Yanita Devi and Chunhu Chen* ; Chem. Asian J. 16, 1644 (2021).

3. "Ozone oxidation of cysteine in optically trapped aqueous micro-droplets", Jia-Rong Li and Yuan-Pin Chang;* J. Chin. Chem. Soc. (2023).

4. "Accelerated Sulfur Oxidation by Ozone on Surfaces of Single Optically Trapped Aerosol Particles", Hsu, Shao-Hong; Lin, Feng-Yu; Huang, Genin; Chang, Yuan-Pin;* J. Phys. Chem. C (2023).

5. "Probe molecular diffusivity in single ternary inorganic-organic microdroplets via interfacial ozonolysis of thiosulfate", Tzu-Chiao Hung, Feng-Yu Lin, Shao-Hung Hsu, Toshio Kasai and Yuan-Pin Chang;* Environmental Science: Atmospheres, accepted (2024)

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