CAJ | 학술논문

以聚阴离子多肽(聚谷氨酸钠)控制合成了微孔二氧化硅空心球.在合成过程中,以3-氨丙基三甲氧基硅烷(APMS)和正硅酸乙酯(TEOS)为硅源,聚谷氨酸钠为模板.硅源与阴离子多肽模板之间的组装依照以阴离子表面活性剂为模板剂组装合成介孔二氧化硅的机理,即S-N+-I-机理,其中S表示阴离子多肽,I表示TEOS,N表示共结构导向剂APMS.组装过程中质子化的APMS与阴离子多肽之间形成静电相互作用,同时,AMPS和TEOS共同水解聚合形成围绕阴离子多肽模板的二氧化硅骨架,多肽的二级结构为微孔孔道的模板.以阴离子多肽为模板可以在不同的实验条件下控制微孔纳米空心球,微孔亚微米空心球和实心球形貌的合成.在生物矿化过程中,阴离子多肽往往控制碳酸钙或磷酸钙的沉积,而我们的实验结果表明,在适当的硅源存在下,阴离子多肽也可以诱导二氧化硅的沉积.
이취음리자다태(취곡안산납)공제합성료미공이양화규공심구.재합성과정중,이3-안병기삼갑양기규완(APMS)화정규산을지(TEOS)위규원,취곡안산납위모판.규원여음리자다태모판지간적조장의조이음리자표면활성제위모판제조장합성개공이양화규적궤리,즉S-N+-I-궤리,기중S표시음리자다태,I표시TEOS,N표시공결구도향제APMS.조장과정중질자화적APMS여음리자다태지간형성정전상호작용,동시,AMPS화TEOS공동수해취합형성위요음리자다태모판적이양화규골가,다태적이급결구위미공공도적모판.이음리자다태위모판가이재불동적실험조건하공제미공납미공심구,미공아미미공심구화실심구형모적합성.재생물광화과정중,음리자다태왕왕공제탄산개혹린산개적침적,이아문적실험결과표명,재괄당적규원존재하,음리자다태야가이유도이양화규적침적.
Anionic polypeptide,the poly(sodium L-glutamate),was applied to fabricate microporous silica hollow nanospheres templated by the secondary structures of the polypeptide as porogens.In the synthesis,3-arninopropyltfimethoxysilane(APMS)and tetraethyl orthosilicate(TEOS)were used as the silica sources.and the coassembly followed the mechanism of the aniomc surfactant-templated mesoporous silica(AMS)through a S-N+-I-pathway,where S indicates the anionoc polypeptide,I indicates inorganic precursors(TEOS),and N indicates costructure-directing agent(APMS),which interacted with the negatively charged anionic polypeptide secondary structures electrostatically and cocondensed with silica source to form the silica framework.The product WaS subiected to characterizations of X-ray diffraction(XRD),infrared(tR)spectroscopy,thermogravimetric(TG)analysis,scanning electron microscopy(SEM),transmitted electron microscopy(TEM),and nitrogen adsorption-desorption measurement.It was found that the pH value of the synthesis solution was an important factor to the morphological control of the silica products.Besides the microporous hollow nanospheres,microporous submicron silica solid and hollow spheres were also obtained facilely by changing the synthesis parameters.Our study further implied that anionic polypeptides,which were abk to control mineralization of calcium carbonate and calcium phosphate.could also induce silica condensation in the presence of proper silica precursors.It was also expected that functional calcium carbonate (phosphate)/silica-nanocomposite materials would be fabricated under the control of the anionic polypeptide.