Synthesis of mesoporous silica hollow spheres with complex morphology
Guo, Jie (2018)
Guo, Jie
Tampereen ammattikorkeakoulu
2018
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:amk-2018080614436
https://urn.fi/URN:NBN:fi:amk-2018080614436
Tiivistelmä
Nowadays, mesoporous materials with hierarchical structure and definite morphology have attracted great attention. Mesoporous materials research not only can be applied to practical applications, but also reveal the basic mechanism of biomineralization. Among the different types of mesoporous materials, hollow spheres are widely used in catalysis, drug delivery, and controlled-release applications.
In this paper, we use Polystyrene spheres as hard-templating agent, with the addition of the anionic surfactant N-lauroylsarcosine sodium (Sar-Na) to create mesopores with complex morphology on the surface of silica hollow spheres. For the growth of mesoporous silica hollow spheres with budding morphology, Wang has been synthesized using the emulsion template method. This article uses a new synthesis method, namely use the PS microspheres as a template agent, and the occurrence of carboxylic acid and amino groups follows acid-base reaction. Calcination at high temperature to form a hollow structure of mesoporous silica hollow spheres. And using Sar-Na as a templating agent in combination with a part of hydrochloric acid to form an amphoteric polar oil, the Sar-H in the form of droplets, which is often used in cosmetics and pharmaceutical industry due to Sar-Na biodegradability and low toxicity. According to the pioneering study of anionic surfactant-templated mesoporous silica (ASM) by Tatsumi and colleagues, the co-assembly of anionic surfactant (S) and silica precursor (I) follows S-N+~I-. The pathway, in which N is a co-structural directing agent, such as APMS. Sar-H oil swells the hybrid gum and converts the columnar micelle phase into a lamellar phase, thereby producing buds of bubble-like intermediate structures. The added of the silica precursors (3-aminopropyltriethoxysilane (APES) and tetraethyl orthosilicate (TEOS)) surrounds PS pellets to form hollow spheres. This paper also studied the effect of different hydrochloric acid content conditions on the morphology and structure of mesoporous silica. And confirmed the practical application of mesoporous silica hollow spheres. 近来,具有层次结构和明确形态的介孔材料引起了人们的广泛关注。介孔材料的研究不仅可以运用于实际应用中,也可能揭示生物矿化的基本机制。在众多类型的介孔材料中,空心球因其在封装,给药和控释应用中的潜在用途而具有重要意义。
在本论文中,我们使用PS小球为硬模板剂,连同加入一种阴离子表面活性剂十二烷基氨酸钠(Sar-Na)来制造表面有复杂形态的介孔二氧化硅空心球。对于出芽形貌的介孔二氧化硅空心小球生长已有Wang使用乳液模板法合成,本文使用一种新的合成方法,即使用PS微球为模板剂, 发生了羧酸与氨基的酸碱反应,高温煅烧后形成介孔二氧化硅空心球的中空结构。并使用Sar-Na 为模板剂结合一部分盐酸形成一种两性极性油,表现为液滴状态的Sar-H,由于Sar-Na生物降解性和低毒性,其常用于化妆品和制药工业。根据Tatsumi及其同事对阴离子表面活性剂模板化介孔二氧化硅(ASM)的开创性研究,阴离子表面活性剂(S)和二氧化硅前体(I)的共同组装遵循S-N+〜I-途径,其中N为一种共结构导向剂,如APMS。Sar-H油使杂合胶溶胀并将柱状胶束相转变成层状相,从而产生泡状中间结构的芽。加入的二氧化硅前体(3-氨基丙基三乙氧基硅烷(APES)和原硅酸四乙酯(TEOS))包裹PS小球以形成中空球体。本文还对不同盐酸含量条件下的合成,对介孔二氧化硅的形貌,结构的影响进行研究。
In this paper, we use Polystyrene spheres as hard-templating agent, with the addition of the anionic surfactant N-lauroylsarcosine sodium (Sar-Na) to create mesopores with complex morphology on the surface of silica hollow spheres. For the growth of mesoporous silica hollow spheres with budding morphology, Wang has been synthesized using the emulsion template method. This article uses a new synthesis method, namely use the PS microspheres as a template agent, and the occurrence of carboxylic acid and amino groups follows acid-base reaction. Calcination at high temperature to form a hollow structure of mesoporous silica hollow spheres. And using Sar-Na as a templating agent in combination with a part of hydrochloric acid to form an amphoteric polar oil, the Sar-H in the form of droplets, which is often used in cosmetics and pharmaceutical industry due to Sar-Na biodegradability and low toxicity. According to the pioneering study of anionic surfactant-templated mesoporous silica (ASM) by Tatsumi and colleagues, the co-assembly of anionic surfactant (S) and silica precursor (I) follows S-N+~I-. The pathway, in which N is a co-structural directing agent, such as APMS. Sar-H oil swells the hybrid gum and converts the columnar micelle phase into a lamellar phase, thereby producing buds of bubble-like intermediate structures. The added of the silica precursors (3-aminopropyltriethoxysilane (APES) and tetraethyl orthosilicate (TEOS)) surrounds PS pellets to form hollow spheres. This paper also studied the effect of different hydrochloric acid content conditions on the morphology and structure of mesoporous silica. And confirmed the practical application of mesoporous silica hollow spheres.
在本论文中,我们使用PS小球为硬模板剂,连同加入一种阴离子表面活性剂十二烷基氨酸钠(Sar-Na)来制造表面有复杂形态的介孔二氧化硅空心球。对于出芽形貌的介孔二氧化硅空心小球生长已有Wang使用乳液模板法合成,本文使用一种新的合成方法,即使用PS微球为模板剂, 发生了羧酸与氨基的酸碱反应,高温煅烧后形成介孔二氧化硅空心球的中空结构。并使用Sar-Na 为模板剂结合一部分盐酸形成一种两性极性油,表现为液滴状态的Sar-H,由于Sar-Na生物降解性和低毒性,其常用于化妆品和制药工业。根据Tatsumi及其同事对阴离子表面活性剂模板化介孔二氧化硅(ASM)的开创性研究,阴离子表面活性剂(S)和二氧化硅前体(I)的共同组装遵循S-N+〜I-途径,其中N为一种共结构导向剂,如APMS。Sar-H油使杂合胶溶胀并将柱状胶束相转变成层状相,从而产生泡状中间结构的芽。加入的二氧化硅前体(3-氨基丙基三乙氧基硅烷(APES)和原硅酸四乙酯(TEOS))包裹PS小球以形成中空球体。本文还对不同盐酸含量条件下的合成,对介孔二氧化硅的形貌,结构的影响进行研究。