首页> 外文会议>IUMRS International Conference in Asia;IUMRS-ICA; 20060910-14;20060910-14; Jeju(KR);Jeju(KR) >A new insight into the mechanistic study on synthesis of Silica Nanospheres
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A new insight into the mechanistic study on synthesis of Silica Nanospheres

机译:二氧化硅纳米球合成机理研究的新见解

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The physicochemical characteristics (SEM, N_2 adsorption, FT-IR, MASNMR) of samples from kinetics (10 min, 20 min, 30 min, 1 h and 3h) of hydrolysis of tetraethyl orthosilicate (TEOS) gives new insight into the synthesis of nanosphere. The particle sizes are increased with time, however, the surface areas decreased. FT-IR investigation reveals the presence of high intensed silanol groups of 960 cm~(-1) at 10 min, which reduced on progress of the reaction time. This suggests the partial hydrolysis and condensation of alkoxy groups in TEOS. ~(29)Si MASNMR analysis shows the presence three different silica species(Q_4, Q_3 and Q_2) in 10 and 20 min samples. The intensity of Q_2 species decreases with time and other species concentration were increased.
机译:原硅酸四乙酯(TEOS)水解动力学(10分钟,20分钟,30分钟,1小时和3小时)的样品的理化特性(SEM,N_2吸附,FT-IR,MASNMR)为纳米球的合成提供了新见识。粒度随时间增加,但是表面积减小。 FT-IR研究表明,在10分钟时存在960 cm〜(-1)的高强度硅烷醇基,随着反应时间的延长,硅烷基的数量减少。这表明TEOS中烷氧基的部分水解和缩合。 〜(29)Si MASNMR分析显示在10和20分钟的样品中存在三种不同的二氧化硅种类(Q_4,Q_3和Q_2)。 Q_2物种的强度随时间降低,其他物种的浓度增加。

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