本文選題：碟狀膠體 + 磷酸鋯��； 參考：《廣東工業(yè)大學(xué)》2015年碩士論文

【摘要】：在自然界和工業(yè)產(chǎn)品中,我們經(jīng)常碰到各種碟狀膠體懸浮液體系,例如粘土、瀝青、紅細(xì)胞以及碟狀液晶太陽能電池。盡管他們在自然界中含量豐富,并且在工業(yè)上已經(jīng)得到廣泛地應(yīng)用,但是相對球狀、棒狀膠體顆粒,由于模型體系的缺乏,人們對碟狀膠體顆粒的研究較少。在本課題研究中,我們將以厚度均一,直徑大小可控的單層ZrP碟片為模板體系,研究碟狀膠體液晶的相行為。具體工作如下：1.采用水熱法制備結(jié)晶態(tài)的a-ZrP碟片,并利用TBAOH將其剝離成單層ZrP碟狀膠體液晶,研究了溫度對碟狀液晶相行為的影響。結(jié)果表明：隨著溫度的升高,碟狀液晶的I-N相變初始臨界濃φl會(huì)增大,同時(shí)I-N相變區(qū)間變寬。分析認(rèn)為,對于帶電的ZrP膠體懸浮液體系,ε,T隨著溫度的上升而減小,導(dǎo)致N相的融化,最終使φl;同時(shí)在更高的溫度時(shí),碟狀液晶的相變對多分散性更為敏感,導(dǎo)致碟狀液晶的I-N相變區(qū)間變寬。2.采用水熱法和回流法制備不同直徑大小的ZrP碟片,并利用I-N相變分離法控制碟片的多分散性,繪制了不同直徑大小的ZrP碟狀液晶的I-N相變相圖,觀察了碟片直徑大小對碟狀液晶I-N相變相分離速率的影響。結(jié)果發(fā)現(xiàn),I-N相變臨界濃度φ1會(huì)隨著碟片直徑的增加而變��；I-N相變速率會(huì)隨著碟片粒徑的減小而變大。這是因?yàn)?大的碟片更容易取向,因此大粒徑的碟狀液晶會(huì)率先在較低濃度進(jìn)行I-N相變；而對于較小的碟片,由于其布朗運(yùn)動(dòng)速率較快,使其能更快地形成有序結(jié)構(gòu),因此其I-N相分離速度也就越快。3.利用TBACl分子改變碟狀液晶的離子強(qiáng)度,研究了離子強(qiáng)度對液晶相行為的影響。研究發(fā)現(xiàn),相變臨界濃度φl隨著離子濃度的增加先變大而后減��；隨著離子強(qiáng)度的增加,碟狀液晶的I-N相分離速率變快。這是因?yàn)?隨著離子強(qiáng)度的增加,碟片的有效體積會(huì)減小,同時(shí)顆粒之間的相互靜電排斥力減小。在碟狀液晶的I-N相變過程中,碟片有效體積的減小會(huì)抑制N相的形成,而碟片靜電作用力的減小會(huì)加強(qiáng)碟片各向異性從而促進(jìn)N相的形成。在懸浮液的離子強(qiáng)度較小時(shí),碟片有效體積的減小對液晶相變的影響起主導(dǎo)作用,抑制了N相的形成,φ1變大；而當(dāng)懸浮液的離子強(qiáng)度到達(dá)一定值時(shí),碟片靜電相互作用力的減小在相變過程中取到?jīng)Q定性作用,促進(jìn)的N相的形成,φ1減��；碟片有效體積的減小使得碟片的移動(dòng)速率加快,因此I-N相分離速率變快。
[Abstract]:In natural and industrial products, we often encounter a variety of disk colloid suspension systems, such as clay, asphalt, red blood cells and disk liquid crystal solar cells.Although they are abundant in nature and have been widely used in industry, there are few researches on the disc colloidal particles due to the lack of model system.In this study, we will study the phase behavior of the disc colloidal liquid crystal using monolayer ZrP disk with uniform thickness and controllable diameter as template system.The work is as follows: 1.The crystalline a-ZrP discs were prepared by hydrothermal method, and then separated into a monolayer ZrP disc colloidal liquid crystal by TBAOH. The effect of temperature on the behavior of the disc liquid crystal was studied.The results show that with the increase of temperature, the initial critical concentration 蠁 _ l of the I-N phase transition of the disk liquid crystal increases, and the I-N phase transition range becomes wider.It is concluded that 蔚 T decreases with the increase of temperature for charged ZrP colloid suspensions, which leads to the melting of N phase and finally to 蠁 _ 1. At the same time, the phase transition of disc liquid crystals is more sensitive to the polydispersity at higher temperatures.The I-N phase transition range of the disk liquid crystal becomes wider. 2.ZrP discs with different diameters were prepared by hydrothermal method and reflux method. The polydispersity of disks was controlled by I-N phase transformation separation method. The I-N phase transition phase diagrams of ZrP disk-like liquid crystals with different diameters were plotted.The effect of disc diameter on the phase transition rate of I-N phase transition in a disc liquid crystal was investigated.The results show that the critical concentration of I-N phase transition 蠁 1 decreases with the increase of disc diameter and the change rate of I-N phase transition increases with the decrease of disc diameter.This is because large disks tend to orientate more easily, so large size disks take the lead in the I-N phase transition at lower concentrations; for smaller disks, because of their faster Brownian motion rates, they can form ordered structures faster.Therefore, the faster the I-N phase separation rate is. 3.The effect of ionic strength on liquid crystal phase behavior was studied by changing the ionic strength of disk liquid crystal with TBACl molecule.It is found that the critical concentration of phase transition 蠁 _ l increases first and then decreases with the increase of ion concentration, and the separation rate of I-N phase increases with the increase of ionic strength.This is because, with the increase of ionic strength, the effective volume of the disc decreases and the mutual electrostatic repulsive force between the particles decreases.During the I-N phase transition of the disc liquid crystal, the reduction of the effective volume of the disc will inhibit the formation of the N phase, while the decrease of the electrostatic force of the disc will enhance the anisotropy of the disc and promote the formation of the N phase.When the ionic strength of the suspension is small, the decrease of the effective volume of the disk plays a leading role in the phase transition of liquid crystal, which inhibits the formation of the N phase and increases 蠁 1, but when the ionic strength of the suspension reaches a certain value,The decrease of electrostatic interaction force plays a decisive role in the phase transition process, which promotes the formation of the N phase and the decrease of 蠁 1, and the decrease of the effective volume of the disc accelerates the moving rate of the disc, so the I-N phase separation rate becomes faster.
【學(xué)位授予單位】：廣東工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ134.12

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