臺灣國際科展

懸浮奈米污染物之感測方法(Sensing of Nanopollutants with an Ionic Liquid)

科展類別
臺灣國際科展
屆次
2006年
科別
環境科學
學校名稱
國立家齊女子高級中學
指導老師
林宏松
作者
王采伊
關鍵字
奈米污染物 離子熔液 電阻

摘要或動機

由於奈米科技之進步發展神速,許多難以偵測的奈米污染物可能對生物體造成不可預知的負面影響,然而傳統之感測方法主要針對氣體分子,可能不適用於感測粒狀奈米污染物質。因此,本研究之主要目的是探討(也建立一套)奈米污染物簡易感測方法之可行性。利用二至三個塑膠瓶、塑膠管組裝簡易感測實驗,並且使用非常少量(約0.05 mL)之綠色溶劑(離子熔液),實驗結果顯示奈米ZnO 及螢光粉塵灰(<200 nm)可以使離子熔液之電阻明顯減少;但奈米TiO2 或奈米CuO 反而使電阻增加;未通過過濾材料之螢光粉塵灰(<5000 nm),並未造成離子熔液之電阻明顯改變。上述實驗結果也可以導出至少二個結論: (1)吸收奈米粒子可使離子熔液之電阻改變;但微米以上粒子則否(可據以粗略判斷其粒子大小)及(2)不同奈米粒子吸收於離子熔液具特定電阻(可據以粗略判斷其物種)。Mainly due to the fast development of nanotechnology, many undetectable or unpredictable
nanopollutants may cause negative impacts on the environment and human health. Unlike the traditional sensing systems which can detect select gaseous molecules, effective nanopollutant sensing methods are still lacking in the literature. A feasibility for sensing nanopollutants with an ionic liquid (IL) (e.g., [C4min][PF6] (1-butyl-3-methylimidazolium hexafluorophosphate)) was, therefore, studied in the present work. Detection of nanoparticles such as nano ZnO, nano CuO, nano TiO2 and phosphor particulates was conducted in a home-made nanopollutant sensing system. Experimentally, abstraction of nano ZnO into the IL caused a reduction of the IL resistance. Similarly, decreasing of the IL resistance was also observed in the abstraction of phosphor particles with particles sizes of <200 nm. On the contrary, phosphor particulates with particle sizes of 200-5000 nm could not be abstracted effectively in the IL. Note that an increase of the IL resistance during abstraction of nano TiO2 particles was found. Abstraction of nano CuO in the IL also led to a slight increase of the IL resistance. The determined characteristic resistances of the IL for abstraction of select nano particles such as nano ZnO, nano CuO, nano TiO2 and phosphor particulates may be used in the development of novel nanopollutants sensors.


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