本文選題：磁性微球　切入點(diǎn)：磁響應(yīng)性　出處：《重慶醫(yī)科大學(xué)》2014年碩士論文

【摘要】：目前，磁性微球由于其獨(dú)特的性質(zhì)正成為研究熱點(diǎn)。絕大部分磁性微球的應(yīng)用環(huán)境為水溶液。磁性微球在水相的運(yùn)動(dòng)性能是其應(yīng)用的關(guān)鍵性能指標(biāo)。本文分析磁性微球在水相運(yùn)動(dòng)特點(diǎn)并測定相關(guān)參數(shù)。 本文測量磁性微球在外加磁場的作用下對570nm光透過率變化,將透光率變化曲線轉(zhuǎn)變?yōu)闈岫茸兓�，，跟蹤磁性微球運(yùn)動(dòng)過程。通分析磁性微球的受力，提出磁性微球在水相運(yùn)動(dòng)的力學(xué)模型；通過對大量粒子蒙特卡羅模擬、外加磁場強(qiáng)度分布模擬、粒子光散射計(jì)算，最小二乘擬合實(shí)驗(yàn)測定磁性微球在外部磁場下運(yùn)動(dòng)的濁度變化曲線，達(dá)到最好擬合的磁性微球參數(shù)組合代表其水相運(yùn)動(dòng)相關(guān)特征，藉此同步測定磁性微球水相運(yùn)動(dòng)性相關(guān)的特征參數(shù)。 用此模型擬合分析水相磁性微球運(yùn)動(dòng)過程時(shí)，微球的飽和磁化強(qiáng)度和物理粒徑之間有很強(qiáng)協(xié)方差，使得非線性最小二乘擬合時(shí)不收斂，但對應(yīng)局部最好擬合的飽和磁化強(qiáng)度和粒徑之間有明確規(guī)律性聯(lián)系。先用常規(guī)非線性最小二乘擬合獲得對應(yīng)局部最好擬合的飽和磁化強(qiáng)度和物理粒徑的關(guān)聯(lián)函數(shù)；再用此函數(shù)限制兩種參數(shù)的變化，擬合所記錄的透過率變化曲線，能得到對應(yīng)全局最優(yōu)擬合的所需參數(shù)組合。 用此特殊的迭代擬合方法所得磁性微球相關(guān)參數(shù)與其它方法所得大部分一致，少數(shù)磁性微球由于特殊原因擬合結(jié)果有偏差。通過對模型的驗(yàn)證及對算法的優(yōu)化，該模型能夠很好的計(jì)算出磁性微球在水相的表觀粒徑、磁化強(qiáng)度等與水相運(yùn)動(dòng)相關(guān)的性質(zhì)，有望用于定量表征磁性微球，并用于指導(dǎo)磁性微球的設(shè)計(jì)和制備。
[Abstract]:At present, magnetic microspheres are becoming a research hotspot due to their unique properties.Most of the magnetic microspheres are applied in aqueous solution.The motion performance of magnetic microspheres in aqueous phase is the key performance index of its application.In this paper, the motion characteristics of magnetic microspheres in aqueous phase are analyzed and the relevant parameters are measured.The optical transmittance of magnetic microspheres to 570nm under the action of external magnetic field was measured. The change curve of transmittance was transformed into the turbidimetric change curve, and the motion process of magnetic microspheres was tracked.The mechanical model of magnetic microspheres in water phase is put forward by analyzing the force of magnetic microspheres, and the particle light scattering is calculated by Monte Carlo simulation of a large number of particles and the intensity distribution of magnetic field.The turbidity curve of magnetic microspheres moving under external magnetic field was measured by least square fitting experiment.The characteristic parameters related to the water phase movement of magnetic microspheres were measured synchronously.When the model is used to fit and analyze the motion of magnetic microspheres in aqueous phase, there is a strong covariance between saturation magnetization and physical particle size of the microspheres, which makes the nonlinear least square fitting not convergent.However, there is a clear correlation between saturation magnetization and particle size, which corresponds to the best local fitting.The correlation function of saturation magnetization and physical particle size corresponding to the local best fitting is obtained by the conventional nonlinear least square fitting, and then the variation of the two parameters is limited by this function to fit the recorded transmittance curve.The required parameter combinations corresponding to the global optimal fitting can be obtained.The correlation parameters of the magnetic microspheres obtained by this special iterative fitting method are mostly consistent with those obtained by other methods, and a few magnetic microspheres have deviations from the fitting results due to special reasons.Through the verification of the model and the optimization of the algorithm, the model can well calculate the apparent particle size and magnetization of the magnetic microspheres in the aqueous phase, which is expected to be used to quantitatively characterize the magnetic microspheres.It is used to guide the design and preparation of magnetic microspheres.
【學(xué)位授予單位】：重慶醫(yī)科大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：R943

【共引文獻(xiàn)】

相關(guān)期刊論文 前10條

1 黃飛來,鄭典模;納米氧化鐵的制備工藝[J];江西化工;2003年01期

2 韓笑;王源升;;DBSA含量對納米Fe_3O_4/導(dǎo)電聚苯胺結(jié)構(gòu)和電磁性能的影響[J];四川大學(xué)學(xué)報(bào)(工程科學(xué)版);2007年04期

3 朱華,張華鵬,張建春;吸波型電磁屏蔽紡織品的開發(fā)[J];上海紡織科技;2005年03期

4 李新貴,王健,黃美榮;導(dǎo)電聚苯胺納米粒子的形成及影響因素[J];塑料工業(yè);2003年12期

5 曹慧群;李上嬌;胡惠媛;劉劍洪;;聚苯胺/碳納米管/Ni_(0.5)Zn_(0.5)Fe_2O_4制備及其磁性能[J];深圳大學(xué)學(xué)報(bào)(理工版);2008年01期

6 李鵬,官建國,張清杰,袁潤章;聚苯胺/鎳納米復(fù)合材料原位復(fù)合與性能表征[J];武漢理工大學(xué)學(xué)報(bào);2005年03期

7 張杰;胡登華;;磁性納米Fe_3O_4粒子的制備與應(yīng)用[J];武漢工程大學(xué)學(xué)報(bào);2011年10期

8 蘇碧桃;左顯維;胡常林;雷自強(qiáng);;導(dǎo)電聚苯胺與磁性CoFe_2O_4納米復(fù)合物的合成及其電磁性能[J];物理化學(xué)學(xué)報(bào);2008年10期

9 周超;戴紅蓮;;磁性微球的制備[J];化工中間體;2006年07期

10 閆哲;陳英;王玉華;陳東;王路輝;;細(xì)乳液聚合制備磁性復(fù)合微球研究進(jìn)展[J];現(xiàn)代化工;2014年04期

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