本文選題：顆粒　切入點(diǎn)：接觸角　出處：《山東建筑大學(xué)》2016年碩士論文

【摘要】：顆粒型材料被廣泛地應(yīng)用于很多領(lǐng)域。顆粒材料表面潤(rùn)濕性能會(huì)極大地影響界面性能及整體性能。接觸角是表征液體在固體材料表面的潤(rùn)濕性及自由能的重要物理量,因此對(duì)接觸角測(cè)量的研究無(wú)論是在材料研究還是應(yīng)用都有重要意義。目前,對(duì)接觸角的測(cè)量多限于具有光滑平面的固體材料,而對(duì)于表面既不光滑也不平整的顆粒型固體,液體在其固體表面表觀接觸角的測(cè)量相對(duì)比較困難。通過(guò)研究發(fā)現(xiàn),顆粒堆積型多孔介質(zhì)中,液體形態(tài)及分布發(fā)生變化時(shí)所對(duì)應(yīng)的臨界含濕率是由液體在顆粒表面的表觀接觸角決定。鑒于此,本文以建立的臨界含濕率與接觸角關(guān)系模型為基礎(chǔ),通過(guò)確定其臨界含濕率,進(jìn)而確定液體在顆粒表面的表觀接觸角。臨界含濕率的確定通過(guò)顯微觀測(cè)實(shí)驗(yàn)和電導(dǎo)率測(cè)量實(shí)驗(yàn)這兩種方法實(shí)現(xiàn)。通過(guò)顯微觀測(cè)實(shí)驗(yàn),分析顆粒堆積而成的多孔介質(zhì)內(nèi)液體形態(tài)及分布隨含濕率的變化,進(jìn)而確定其臨界含濕率。通過(guò)研究分析發(fā)現(xiàn),非導(dǎo)電顆粒堆積多孔介質(zhì)的導(dǎo)電性能與介質(zhì)內(nèi)導(dǎo)電液體的形態(tài)及分布密切相關(guān),因此對(duì)于顆粒堆積形成的多孔介質(zhì)內(nèi)液體形態(tài)不易觀測(cè)的情況,若顆粒本身不導(dǎo)電而液體導(dǎo)電,則可通過(guò)測(cè)量電導(dǎo)率方法確定臨界含濕率。選用具有光滑平面且不導(dǎo)電的平板玻璃和載玻片進(jìn)行接觸角的測(cè)量后,對(duì)其進(jìn)行破碎并獲得不同粒徑范圍的破碎玻璃顆粒,作為堆積顆粒型多孔介質(zhì)試樣。在不同液相介質(zhì)條件下,分別對(duì)不同含濕率下時(shí)不同顆粒試樣的電導(dǎo)率及體積變化率進(jìn)行實(shí)驗(yàn)測(cè)量,在此基礎(chǔ)上確定臨界含濕率。結(jié)合測(cè)量得到的液體在玻璃或載玻片上的接觸角,對(duì)接觸角與臨界含濕率關(guān)系式進(jìn)行了驗(yàn)證。由此,本文獲得了測(cè)定顆粒型固體表面接觸角的測(cè)量方法。選用不同粒徑范圍且不導(dǎo)電的沙粒堆積形成的顆粒型試樣,測(cè)量不同液體在其表面的接觸角。通過(guò)實(shí)驗(yàn)測(cè)量不同含濕率、不同粒徑試樣的表觀體積變化率,并利用電導(dǎo)率及CCD顯微觀測(cè)共同確定臨界含濕率。結(jié)合接觸角與臨界含濕率的關(guān)系式并進(jìn)行相應(yīng)的數(shù)據(jù)處理,得到的不同液體在沙粒表面的接觸角。
[Abstract]:Granular materials are widely used in many fields.The surface wettability of granular materials will greatly affect the interfacial properties and overall properties.Contact angle is an important physical quantity to characterize the wettability and free energy of liquid on the surface of solid materials.At present, the measurement of contact angle is limited to the solid material with smooth plane, but it is relatively difficult to measure the apparent contact angle of liquid on the solid surface for granular solids whose surfaces are neither smooth nor smooth.It is found that the critical moisture content corresponding to the change of liquid morphology and distribution in granular packed porous media is determined by the apparent contact angle of liquid on the particle surface.In view of this, based on the established model of critical moisture content and contact angle, the apparent contact angle of liquid on particle surface is determined by determining its critical moisture content.The determination of critical moisture content is realized by two methods: microscopic observation experiment and conductivity measurement experiment.The changes of liquid morphology and distribution with moisture content in porous media formed by particles were analyzed by microscopic observation, and the critical moisture content was determined.Through research and analysis, it is found that the conductivity of non-conductive granular stacked porous media is closely related to the morphology and distribution of conductive liquid in the medium, so it is difficult to observe the liquid morphology in porous media formed by particle stacking.If the particle itself is not conductive and the liquid is conducting, the critical moisture content can be determined by measuring the conductivity.After measuring the contact angle of flat glass and glass slide with smooth plane and non-conductive surface, the broken glass particles with different particle sizes were obtained, which were used as the sample of piling granular porous media.The electrical conductivity and volume change rate of different particle samples with different moisture content were measured under different liquid medium conditions, and the critical moisture content was determined on the basis of these measurements.The relation between the contact angle and the critical moisture content of the liquid on glass or glass slide is verified.Therefore, a method for measuring the contact angle of granular solid surface is obtained.The contact angles of different liquids on the surface were measured by using granular samples with different particle size range and non-conductive sand accumulation.The apparent volume change rate of samples with different moisture content and particle size was measured by experiments, and the critical moisture content was determined by electrical conductivity and CCD microscopic observation.According to the relation between contact angle and critical moisture content and corresponding data processing, the contact angles of different liquids on sand surface are obtained.
【學(xué)位授予單位】：山東建筑大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：TB302

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本文編號(hào)：1710593