本文選題：微納米CaCO_3 + 表面活性劑��； 參考：《湖北工業(yè)大學》2015年碩士論文

【摘要】：隨著碳酸鈣(CaCO_3)粉體應用的不斷推廣,對CaCO_3晶型和形貌的調(diào)控成為一個熱門課題。本論文利用多種模板調(diào)控CaCO_3晶體的生長,考察了碳化工藝中影響晶體結(jié)晶狀態(tài)和形貌的因素,對CaCO_3晶體的形成機理進行了研究,并對Ca(HCO_3)_2熱分解法制備CaCO_3進行了初步探索。論文首先以棕櫚酸為表面活性劑,研究了不同添加量的棕櫚酸對Ca(OH)_2碳化生成的CaCO_3晶型與形貌的影響,采用X射線衍射儀(XRD)、掃描電子顯微鏡(SEM)、透射電子顯微鏡(TEM)、激光粒度分析儀(ZPA)和傅里葉紅外光譜儀(FT-IR)對CaCO_3的晶型和形貌進行了分析和觀察,得出了添加棕櫚酸不能改變CaCO_3的晶型,但可以影響CaCO_3形貌的結(jié)論,同時討論了不同形貌CaCO_3顆粒的形成機制。論文接著在相同的實驗條件下,研究了月桂酸、棕櫚酸和硬脂酸等不同碳鏈長度的長鏈脂肪酸對CaCO_3晶型和形貌的調(diào)控。研究結(jié)果顯示脂肪酸的加入對CaCO_3晶型同樣沒有影響,但是隨著脂肪酸碳鏈長度和加入量的增加,CaCO_3顆粒更容易團聚成棒狀的聚集體,聚集體體積也有變大的趨勢。論文從不同碳鏈長度的脂肪酸在顆粒表面形成膠束的不同變形程度及其在不同加入量時的不同聚集狀態(tài)討論了不同形貌CaCO_3的形成機理。論文最后對Ca(HCO_3)_2熱分解工藝制備CaCO_3進行了初步探索,在前期研究的基礎上,著重考察了攪拌強度對Ca(HCO_3)_2熱分解生成CaCO_3的影響,采用XRD和掃描電子顯微鏡(SEM)對CaCO_3的晶型和形貌晶型了分析和觀察。結(jié)果發(fā)現(xiàn)攪拌強度不僅可以影響CaCO_3的顆粒形貌,還改變了CaCO_3的晶體類型,即攪拌限制了熱力學最不穩(wěn)定相球霰石的結(jié)晶,而有利于穩(wěn)定的方解石相的結(jié)晶。當PEG-6000添加到反應體系中時,隨著攪拌的加強,也得出了類似的結(jié)果。論文從原子堆積角度解釋了攪拌對CaCO_3晶型的影響。論文成功地以Ca(OH)_2為原料、以碳化法制備微納米CaCO_3,對合成過程中CaCO_3的晶型、形貌以及形成機理進行了研究和分析,為不同形貌CaCO_3粉體的調(diào)控制備提供了理論依據(jù)。特別地,對Ca(HCO_3)_2熱分解工藝制備CaCO_3進行的初步探索也為CaCO_3粉體的制備提供了一個全新的途徑,并為該工藝中不同晶型和形貌CaCO_3粉體的調(diào)控提供了理論依據(jù)。
[Abstract]:With the increasing application of CaCO3) powder, the regulation of CaCOS3 crystal form and morphology has become a hot topic. In this paper, the growth of CaCOs _ 3 crystal is regulated by various templates. The factors affecting the crystal state and morphology in carbonization process are investigated. The formation mechanism of CaCO-C _ 3 crystal is studied, and the preparation of CaCOS _ 3 by thermal decomposition method is studied. In this paper, palmitic acid was first used as surfactant to study the effect of palmitic acid on the morphology and morphology of CaCOS3 formed by carbonization of CaOH-2. The crystal structure and morphology of CaCO3 were analyzed and observed by X-ray diffractometer, scanning electron microscope (SEM), transmission electron microscope (TEM), laser particle size analyzer (ZPA) and Fourier transform infrared spectroscopy (FTIR). The results show that palmitic acid can not change the crystal form of CaCO3. The formation mechanism of CaCO3 particles with different morphology was discussed. Under the same experimental conditions, the effects of long chain fatty acids such as lauric acid, palmitic acid and stearic acid on the crystal form and morphology of CaCO3 were studied. The results showed that the addition of fatty acids had no effect on the crystal form of CaCOC _ 3, but with the increase of carbon chain length and addition amount of fatty acids, CaCOC _ 3 particles were more easily agglomerated into rod-like aggregates, and the aggregate volume also tended to increase. In this paper, the formation mechanism of CaCO3 with different morphology was discussed from the different deformation degree of fatty acids with different carbon chain length on the surface of particles and the different aggregation states of different amount of fatty acids added. At the end of the paper, the preparation of Caco _ 3 by the thermal decomposition process of Caco _ 3S _ 2 was studied. On the basis of the previous research, the influence of stirring intensity on the thermal decomposition of CaHCO-3T _ 2 to CaCO-S _ 3 was investigated. The crystal and morphology of CaCO3 were analyzed and observed by XRD and SEM. The results show that stirring intensity can not only affect the morphology of CaCOS3, but also change the crystal type of CaCO3, that is, agitation limits the crystallization of the most unstable phase in thermodynamics, but is beneficial to the crystallization of stable calcite phase. When PEG-6000 was added to the reaction system, a similar result was obtained with the agitation. In this paper, the effect of agitation on the crystal form of CaCO3 is explained from the angle of atomic stacking. In this paper, CaCO3 was successfully prepared by carbonization method from CaOH _ 2. The crystal form, morphology and formation mechanism of CaCO-C _ 3 in the process of synthesis were studied and analyzed, which provided a theoretical basis for the preparation of CaCO3 powders with different morphologies. In particular, the preliminary exploration on the preparation of CaCO3 by the thermal decomposition process of CaHCO3 / s _ 2 also provides a new way for the preparation of CaCO3 powder, and provides a theoretical basis for the regulation of CaCO3 powders with different crystal forms and morphology.
【學位授予單位】：湖北工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TQ132.32;TB383.1

【參考文獻】

相關期刊論文 前2條

1 吳剛;王小鋒;郎雷鳴;鮮華;葛秀濤;;咪唑?qū)μ妓徕}晶型和形貌的調(diào)控研究[J];人工晶體學報;2010年05期

2 王靜梅,姚松年;殼聚糖-氨基酸體系中碳酸鈣模擬生物礦化的研究[J];無機化學學報;2002年03期

，

本文編號：2030104