CAJ | 학술논문

以短链阳离子三聚表面活性剂[C10H21N+(CH3)2(CH2)2N+(CH3)(C10H21)(CH2)2N+(CH3)2C10H21]·3Br-为结构导向剂,通过2,7-二(3-三乙氧硅基氨丙酯基)萘(NIS)和四乙氧基硅烷(TEOS)共缩聚,制备了有序的萘基桥联的杂化周期性介孔有机硅(PMOs).样品通过X射线衍射(XRD)、高分辨透射电镜(HRTEM)、氮气吸附-脱附、差示扫描量热/热重分析(DSC/TGA)表征.结果表明,当NIS占NIS和TEOS总量40%(摩尔分数)时,可以形成具有结晶态孔壁的有序介孔杂化材料.当NIS含量低于或高于40%时,分别形成无定形孔壁的有序介孔杂化材料和无孔杂化材料.随着孔壁中萘基基团的增加,由于有机基团之间π-π堆积作用增强,杂化介孔材料显示良好的热稳定性.由于在二氧化硅骨架中嵌入荧光萘基基团,杂化有机-无机有序介孔材料显示了激基缔合物的光学行为.随萘基基团含量的增加,杂化材料的紫外吸收峰发生蓝移,形成H聚集体;由于聚集引起的荧光淬灭,杂化材料的荧光量子产率明显降低.
이단련양리자삼취표면활성제[C10H21N+(CH3)2(CH2)2N+(CH3)(C10H21)(CH2)2N+(CH3)2C10H21]·3Br-위결구도향제,통과2,7-이(3-삼을양규기안병지기)내(NIS)화사을양기규완(TEOS)공축취,제비료유서적내기교련적잡화주기성개공유궤규(PMOs).양품통과X사선연사(XRD)、고분변투사전경(HRTEM)、담기흡부-탈부、차시소묘량열/열중분석(DSC/TGA)표정.결과표명,당NIS점NIS화TEOS총량40%(마이분수)시,가이형성구유결정태공벽적유서개공잡화재료.당NIS함량저우혹고우40%시,분별형성무정형공벽적유서개공잡화재료화무공잡화재료.수착공벽중내기기단적증가,유우유궤기단지간π-π퇴적작용증강,잡화개공재료현시량호적열은정성.유우재이양화규골가중감입형광내기기단,잡화유궤-무궤유서개공재료현시료격기체합물적광학행위.수내기기단함량적증가,잡화재료적자외흡수봉발생람이,형성H취집체;유우취집인기적형광쉬멸,잡화재료적형광양자산솔명현강저.
Ordered naphthalene-bridged hybrid periodic mesoporous organosilicas (PMOs) were synthesized by co-condensation of 2,7-bis(3-triethoxysilylpropylaminocarbonyloxy) naphthalene (NIS) and tetraethoxy orthosilane (TEOS) using cationic trimeric surfactant [C10H21N +(CH3)2(CH2)2N +(CH3) (C10H21)-(CH2)2N+(CH3)2C10H21]·3Br- as a structure-directing agent. The resulting samples were characterized by powder X-ray diffraction, high resolution transmission electron microscopy, nitrogen adsorption-desorption, and differential scanning calorimetry/thermogravimetric analysis. Ordered mesoporous hybrid materials with a crystal-like pore wal formed when the molar ratio of NIS to the sum of NIS and TEOS was 40%. When this value is below or above 40%, ordered mesoporous hybrid materials with amorphous phase in the pore wal s, and nonporous hybrid materials are obtained, respectively. As the number of naphthyl groups in the pore wal s increases, the thermal stability of the hybrid materials is enhanced through the strongπ-πinteractions between organic groups. Because of the fluorescent naphthyl groups in the silica framework, the PMOs exhibit optical behavior consistent with excimer formation. Absorption spectra of the PMOs show blue shifts compared with that of the precursor (NIS), suggesting the formation of aggregates in the pore wal s of the hybrid materials. As the molar ratio of NIS to the sum of NIS and TEOS increases, the fluorescence quantum yield of the PMOs decreases through fluorescence quenching caused by aggregation of naphthyl groups.