Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/10714
標題: 玻璃碳的合成與形成規則孔洞碳膜之研究
Synthesis of Glassy Carbons and Preparation of Carbon Membranes with Ordered Porosity
作者: 鄭隆藤
Cheng, Lung-Teng
關鍵字: furfuryl alcohol;2-呋喃甲醇;glassy carbon;self-assembly;colloidal crystal;opal;玻璃碳;自組裝;膠體晶體;蛋白石結構;反蛋白石結構
出版社: 材料科學與工程學系所
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摘要: 
本研究的主題分為二部分,第一個部分是使用2-呋喃甲醇做為合成玻璃碳的前趨物,並且在其聚合反應中,分別以鹽酸、磷酸和醋酸溶液做為反應的觸媒,觀察實驗中所使用的觸媒與不同的熱裂解溫度分別對2-呋喃甲醇的聚合程度及後續碳化結構的影響。結果顯示,酸的存在的確有助於2-呋喃甲醇的聚合,亦能減少碳化後結構的缺陷;而提高熱裂解溫度,可獲得結構較有序的玻璃碳。值得注意的是,2-呋喃甲醇於含有鹽酸的溶液中,具有強烈的聚合作用,可形成不具黏性的聚2-呋喃甲醇顆粒,其粒徑大小約為0.5-1μm,經過600℃碳化後,可轉變成具有微孔及高比表面積(297 m2/g)的玻璃碳球。反觀其他的系統則聚集成堅硬的塊狀物,僅具有極低的比表面積介於0.3-5.2 m2/g之間。
第二個部分則利用Stöber的方法分別合成280、450及680nm,具有單一分散的氧化矽微球,並使用離心自組裝的方式,探討不同的微球粒徑與離心轉速的實驗條件,對形成膠體晶體結構的排列規則性之影響。經由紫外-可見光光譜儀的量測得知,280nm的氧化矽微球,在2000rpm的高轉速離心時,所堆疊出具週期性規則排列的膠體晶體結構,其波長在632nm處產生了強烈的反射峰,而掃描式電子顯微鏡的觀察亦證實280、450和680nm的氧化矽微球,利用離心自組裝的方法確實可獲得高品質之膠體晶體。此外,後續將以氧化矽的膠體晶體為模版,利用離心力將2-呋喃甲醇填充於膠體晶體的孔隙中,再經過聚合反應及碳化等製程,最後利用氫氟酸蝕刻移除氧化矽膠體晶體的模版,即可獲得以玻璃碳為骨架,每個球形孔洞均被周圍六個相似的孔洞所包圍,而呈現六方密排陣列的規則孔洞結構,此即為玻璃碳之反蛋白石結構。

The topic of this study consists of two parts. First, furfuryl alcohol (FA) is used as a precursor for synthesis of glassy carbon. During the polymerization reaction, hydrochloric acid, phosphoric acid and acetic acid are respectively used as a catalyst to examine the degree of FA polymerization and the ensuing carbonized structure when catalyst chemistry and pyrolysis temperature are varied. Experiments revealed that the presence of acids does indeed promote polymerization of FA, leading to a reduced defect population. On the other hand, by increasing the pyrolysis temperature, one can achieve ordered glassy carbon with well-defined structure. This is particularly pronounced when the hydrochloric acid was used as a catalyzer, forming “nonstick” polyfurfuryl alcohol (PFA) particles with a diameter ca. 0.5-1 μm. The polymeric particles were then converted into microporous carbon spheres with a specific surface area of 297 m2/g when subjected to calcination at 600oC in argon atmosphere. On the contrary, FA in the rest of the catalyst systems showed aggregated form with a pronouncedly reduced specific surface areas ranging from 0.3 to 5.2 m2/g.
The second part of this study is to synthesize monodispersed silica microspheres with mean particle sizes of 280, 450, and 680nm, respectively using Stöber method. Centrifugal self-assembly is then conducted to investigate the effect of experimental variables such as particle size and rotational speed of the centrifuge on the packing periodicity of the colloidal crystal structures. As shown by the UV-visible spectroscopy measurements, a strong reflection peak at a wavelength of 632nm is observed for the periodic colloidal crystal structure orderly formed by the silica microspheres with particle size of 280 nm at 2000 rpm of centrifugal speed. Moreover, it is also confirmed by scanning electron microscope (SEM) that high-quality colloidal crystal can indeed be obtained via the centrifugal self-assembly of silica microspheres with particle sizes of 280, 450, and 680nm. Furfuryl alcohol is subsequently infiltrated into the interstitial spacings of the silica colloidal crystal, which is serving as a template, followed by processes of polymerization and carbonization. The silica colloidal crystal template is then removed by hydrofluoric acid (HF) to acquire a well-ordered porous structure consisting of hexagonal close-packed arrays, with the glassy carbon as the backbone and each spherical pore surrounded by six adjacent similar pores. An inverse opal structure of glassy carbon has been prepared.
URI: http://hdl.handle.net/11455/10714
Appears in Collections:材料科學與工程學系

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