【摘要】：納米Ag具有高效、廣泛及持久抗菌等優(yōu)點,被廣泛應用于工業(yè)、環(huán)境保護、醫(yī)藥等領(lǐng)域,但其尺寸效應帶來的團聚現(xiàn)象導致其抗菌性能降低,限制了納米Ag在抗菌領(lǐng)域的應用。為解決納米Ag/Al2O3材料在制備和使用過程中出現(xiàn)的團聚的問題,改善其O吸附性能及抗菌性能。本文采用熔模鑄造和浸漬法制備出納米Ag負載Al基多孔材料。對納米Ag負載Al基多孔材料的制備、O吸附性能及抗菌性能進行了研究,主要研究結(jié)果如下:(1)利用熔模鑄造法,以純鋁為原料制備出孔結(jié)構(gòu)為25PPI和30PPI的多孔鋁基載體。通過實驗發(fā)現(xiàn),當采用無缺陷型石膏型為前驅(qū)體制備多孔鋁基材料時,其孔結(jié)構(gòu)與鋁液溫度、模具溫度和壓力三個參數(shù)密切相關(guān),分析得出載體的最佳制備工藝為:鋁液溫度為760～780℃,模具溫度為530℃,壓力為0.35MPa。(2)采用浸漬法在多孔鋁基載體上負載納米Ag。通過對Ag形貌的分析發(fā)現(xiàn)多孔鋁載體在AgN03濃度為1%時配制的銀氨絡合物中浸漬1h,干燥后在10%H2+90%Ar氣氛下,通過還原溫度250℃、還原時間3h的還原過程可在多孔鋁基材料表面獲得尺寸為100～200mm的球形納米Ag,并且納米Ag在多孔鋁表面分散較為均勻,無團聚現(xiàn)象發(fā)生。(3)利用XPS對樣品表面元素進行了分析。其分析結(jié)果表明,樣品在還原及氧化過程中,會發(fā)生Al與Ag的相互作用,在樣品表面形成Al95Ag5;氧化態(tài)樣品中Al95Ag5的量較還原態(tài)樣品多,而Al95Ag5的增加不利于Ag與O的相互作用;相比于還原態(tài)樣品而言,氧化態(tài)樣品吸附的O較多,結(jié)合能也較高,分析認為氧化態(tài)樣品中的O較多的是以較深層次的O原子或表面分子吸附O,而還原態(tài)樣品為原子態(tài)吸附O。(4)討論了還原態(tài)和氧化態(tài)納米Ag負載Al基多孔材料對大腸桿菌和金黃色葡萄球菌的殺菌作用。結(jié)果表明,還原態(tài)樣品殺菌率明顯好于氧化態(tài)樣品。其在60min內(nèi),還原態(tài)樣品對大腸桿菌的殺菌率可以達到95%,對金黃色葡萄球菌的殺菌率可以達到98.6%,表現(xiàn)出了非常好的殺菌效果;另外,Ag的抗菌性能并非隨O吸附量的增加而提高,而是與Ag和O的作用形式密切相關(guān)。
[Abstract]:Nanocrystalline Ag has been widely used in industry, environmental protection, medicine and other fields because of its high efficiency, wide and lasting antibacterial properties. However, the agglomeration caused by its size effect leads to the decrease of its antibacterial performance, which limits the application of nanometer Ag in antibacterial field. In order to solve the problem of agglomeration in the preparation and application of nanometer Ag/Al2O3 materials, the O adsorption and antimicrobial properties of nanocrystalline Ag/Al2O3 materials were improved. In this paper, nano Ag supported Al based porous materials were prepared by investment casting and impregnation. The adsorption and antibacterial properties of nano-sized Ag supported Al based porous materials were studied. The main results were as follows: (1) porous aluminum carriers with pore structure of 25PPI and 30PPI were prepared by using pure aluminum as raw material by investment casting. The experimental results show that the pore structure of porous aluminum matrix is closely related to the temperature of molten aluminum, mold temperature and pressure when the non-defect gypsum mould is used as the precursor. The results show that the optimum preparation process of the carrier is as follows: the temperature of liquid aluminum is 760,780 鈩，

本文編號：2222937