Controlled Microstructure and Photochromism of Inorganic-organic Thin Films by Ultrasound

来源 :Journal of Materials Science & Technology | 被引量 : 0次 | 上传用户:xujinjinjin
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
A series of inorganic-organic thin films based on uniformly dispersed nanoparticles of polyoxometalates (POM) entrapped in polyacrylamide (PAM) matrix were prepared by ultrasonic method with different irradiation time. The microstructure,photochromic behavior and mechanism of the films were studied by transmission electron microscopy (TEM),ultraviolet-visible spectra (UV-VIS) and Fourier transform-infrared spectroscopy (FT-IR). The microstructure and photochromic properties of the hybrid thin films could be controlled by ultrasound. TEM image revealed that the average size of phosphotungstic acid (PWA) nanoparticles decreased from 20 to 10 nm with the ultrasound irradiation time from 30 to 60 min.After irradiated with ultraviolet light, the transparent films changed from colorless to blue and showed reversible photochromism.The hybrid film,with ultrasound irradiation for 60 min had higher photochromic efficiency and faster bleaching reaction than the one with ultrasound irradiation for 30 min.FT-IR spectra showed that the Keggin geometry of heteropolyoxometalate was still preserved inside the composites,and the interactions between polyanions and polymer matrix increased as the ultrasound time prolonged.It is suggested that the mechanism of the different photochromic properties for the inorganic-organic thin films is the variation of the microstructure and interfacial interactions induced by ultrasound. A series of inorganic-organic thin films based on attributable nanoparticles of polyoxometalates (POM) entrapped in polyacrylamide (PAM) matrix were prepared by ultrasonic method with different irradiation time. The microstructure, photochromic behavior and mechanism of the films were studied by transmission electron microscopy (TEM), ultraviolet-visible spectra (UV-VIS) and Fourier transform-infrared spectroscopy (FT-IR). The microstructure and photochromic properties of the hybrid thin films could be controlled by ultrasound. TEM image revealed that the average size of phosphotungstic acid (PWA) nanoparticles decreased from 20 to 10 nm with the ultrasound irradiation time from 30 to 60 min. After irradiated with ultraviolet light, the transparent films changed from colorless to blue and showed reversible photochromism. The hybrid film, with ultrasound irradiation for 60 min had higher photochromic efficiency and faster bleaching reaction than the one with ultrasound irradiation for 30 min. FT-IR spectra showed that the Keggin geometry of heteropolyoxometalate was still preserved inside the composites, and the interactions between polyanions and polymer matrix increased as the ultrasound time prolonged. It is suggested that the mechanism of the different photochromic properties for the inorganic -organic thin films is the variation of the microstructure and interfacial interactions induced by ultrasound.
其他文献
为了加强对药品的管理,保证药品的质量,保障人民群众用药安全有效,更好地维护人民群众的身体健康,国务院于1994年9月29日发出了《关于进一步加强药品管理工作的紧急通知》。
目的:研究松果体和褪黑激素对大鼠脾淋巴细胞增殖及地诺前列酮产生的影响.方法:采用松果体切除术,淋巴细胞增殖反应测定及地诺前列酮放射免疫检定法.结果:大鼠脾淋巴细胞增殖
请下载后查看,本文暂不支持在线获取查看简介。 Please download to view, this article does not support online access to view profile.
本文对新药的应用作了较为全面的论述,并指出新药对提高医疗质量的重要意义。 This article made a more comprehensive discussion on the application of new drugs and p
旨在加强恬尔心系列产品临床应用的研讨会日前在上海文艺宾馆礼堂召开。会上,由上海延安制药厂和日本田边制药株式会社邀请的新华医院王一尘教授和美国斯坦福大学教授作了书
“图境之中/情境之外”展览主要探讨的是真实与虚假的关系,艺术家着意在有限的空间中拉开隐藏在图像中较大的时间跨度(过去和当下),并在刻意渲染的人工情境中,展现出一种带有
生活中标志设计侵权案件时有发生,本文结合与标志设计紧密相连的著作权法,对常见的标志侵权现象等作简单的分析,以期为设计者或设计公司提供借鉴。 Infringement of logo de
语文在所有学科中处于基础地位,语文学习以及学生语文素养的培养对学生其他学科的学习产生着一定的积极影响,因此必须加强对语文教学的重视。而背诵教育作为语文教学的重要手
Liquid foam is a dense packing of gas bubbles in a small amount of liquid containing surfactants or other surface-active macromolecules, which is one of the hig
随着新课程改革的不断深入发展,对课堂教学的有效性要求也越来越高。初中时期是学生各方面能力培养的重要阶段,尤其是作为学科之母的语文,在教学过程中如何培养学生的思维能