The surface of an up-conversion luminescence material was modified by overcoating with SiOa, which was synthesized from a hydrolysis progress of telraethoxysilane （TEOS） in alkalescent condition. By analyzing the hy...The surface of an up-conversion luminescence material was modified by overcoating with SiOa, which was synthesized from a hydrolysis progress of telraethoxysilane （TEOS） in alkalescent condition. By analyzing the hydrolyzed mechanism of TEOS, it was found that there was not only physical adsorption but also chemical bonding between the up-conversion material and SiO2. At the same time, some adsorption bands at 1100, 475, 950, and 3500 cm^-1 were found by FI-IR, which were the characteristic bands of Si-OH and Si-O-Si. By analyzing the surface elements of the coated material by XPS, it was found that its surface only included Si, O, and C elements, and not F and Y. In the picture of XRD, there was no additional peak after surface modification, suggesting that the silica shell was amorphous. The small peak at 20 = 23° in the X-ray diffraction pattern of the coated material was caused by the amorphous SiO2 shell, and the TEM image also proved that the surface of the material was successfully modified by overcoating with SiO2. The amount of hydroxyls was then increased on the surface of the material, which made it easy to connect with other active groups.展开更多
Surface modification of up-conversion luminescence materials （Na[Y0.57Yb0.39Er0.04]F4 modified by amino groups） by grafting and modifying with aldehyde groups was studied by means of Fourier transform infrared spect...Surface modification of up-conversion luminescence materials （Na[Y0.57Yb0.39Er0.04]F4 modified by amino groups） by grafting and modifying with aldehyde groups was studied by means of Fourier transform infrared spectroscopy （FTIR）, scanning electron microscopy （SEM）, thermogravimetric analysis （TGA）, and emission spectrum （EM）. The surface modification effect was compared using two different finishhag agents, p-phthalaldehyde and glutaraldehyde. It was found that the surface of up-conversion luminescence materials could be modified by aldehyde groups of the two finishing agents, the systematic dispersibility and the thermostability of the up-conversion luminescence material modified by p-phthalaldehyde were better than those of the material modified by glutaraldehyde, and the luminous intensity of the material modified by p-phthalaldehyde was increased. The AI （the ratio of the suspended segmental quality in the specimen to the total mass of the specimen） of the material modified by p-phthalaldehyde was higher than that of the material modified by glutaraldehyde. It is obviously seen that the embellishment effect of p-phthalaldehyde as a finishing agent was better than that of glutaraldehyde. In addition, the reasons why p-phthalaldehyde is a good finishing agent are also explained.展开更多
目的通过对杜仲叶相关文献和专利进行计量分析,探讨杜仲叶研究热点与趋势。方法本研究系统检索中国知网和Web of Science数据库中杜仲叶相关文献,运用CiteSpace软件对发文量、作者、机构、关键词进行分析;利用IncoPat专利数据库对杜仲...目的通过对杜仲叶相关文献和专利进行计量分析,探讨杜仲叶研究热点与趋势。方法本研究系统检索中国知网和Web of Science数据库中杜仲叶相关文献,运用CiteSpace软件对发文量、作者、机构、关键词进行分析;利用IncoPat专利数据库对杜仲叶专利申请数量、地域、技术用途、技术功效进行计量分析。结果研究发现国内外杜仲叶研究分别形成了以彭密军和Hirata Tetsuya为核心的研究团队,其中国内侧重于杜仲叶保健功能、产品开发、工艺优化等方面的研究,国外研究更偏向动物实验与体外细胞实验,在杜仲叶活性成分鉴定与药理作用等方面研究较多。杜仲叶专利涉及疾病、医药、化妆品、生物等多个领域,技术功效体现在降低成本、提高安全性与便利性等方面。中国专利申请数量最多,为杜仲叶专利主要申请国,但各领域专利数量均较少,仍具有较高的开发潜力。结论本综述客观地总结了杜仲叶研究热点与专利授权现状,为今后研究与临床应用提供参考。展开更多
基金the National Natural Science Foundation of China (Nos. 50372006, 20273007, and 20407003).
文摘The surface of an up-conversion luminescence material was modified by overcoating with SiOa, which was synthesized from a hydrolysis progress of telraethoxysilane （TEOS） in alkalescent condition. By analyzing the hydrolyzed mechanism of TEOS, it was found that there was not only physical adsorption but also chemical bonding between the up-conversion material and SiO2. At the same time, some adsorption bands at 1100, 475, 950, and 3500 cm^-1 were found by FI-IR, which were the characteristic bands of Si-OH and Si-O-Si. By analyzing the surface elements of the coated material by XPS, it was found that its surface only included Si, O, and C elements, and not F and Y. In the picture of XRD, there was no additional peak after surface modification, suggesting that the silica shell was amorphous. The small peak at 20 = 23° in the X-ray diffraction pattern of the coated material was caused by the amorphous SiO2 shell, and the TEM image also proved that the surface of the material was successfully modified by overcoating with SiO2. The amount of hydroxyls was then increased on the surface of the material, which made it easy to connect with other active groups.
基金This work was financially supported by the National Natural Science Foundation of China (Nos.50372006 and 20273007).
文摘Surface modification of up-conversion luminescence materials （Na[Y0.57Yb0.39Er0.04]F4 modified by amino groups） by grafting and modifying with aldehyde groups was studied by means of Fourier transform infrared spectroscopy （FTIR）, scanning electron microscopy （SEM）, thermogravimetric analysis （TGA）, and emission spectrum （EM）. The surface modification effect was compared using two different finishhag agents, p-phthalaldehyde and glutaraldehyde. It was found that the surface of up-conversion luminescence materials could be modified by aldehyde groups of the two finishing agents, the systematic dispersibility and the thermostability of the up-conversion luminescence material modified by p-phthalaldehyde were better than those of the material modified by glutaraldehyde, and the luminous intensity of the material modified by p-phthalaldehyde was increased. The AI （the ratio of the suspended segmental quality in the specimen to the total mass of the specimen） of the material modified by p-phthalaldehyde was higher than that of the material modified by glutaraldehyde. It is obviously seen that the embellishment effect of p-phthalaldehyde as a finishing agent was better than that of glutaraldehyde. In addition, the reasons why p-phthalaldehyde is a good finishing agent are also explained.
文摘目的通过对杜仲叶相关文献和专利进行计量分析,探讨杜仲叶研究热点与趋势。方法本研究系统检索中国知网和Web of Science数据库中杜仲叶相关文献,运用CiteSpace软件对发文量、作者、机构、关键词进行分析;利用IncoPat专利数据库对杜仲叶专利申请数量、地域、技术用途、技术功效进行计量分析。结果研究发现国内外杜仲叶研究分别形成了以彭密军和Hirata Tetsuya为核心的研究团队,其中国内侧重于杜仲叶保健功能、产品开发、工艺优化等方面的研究,国外研究更偏向动物实验与体外细胞实验,在杜仲叶活性成分鉴定与药理作用等方面研究较多。杜仲叶专利涉及疾病、医药、化妆品、生物等多个领域,技术功效体现在降低成本、提高安全性与便利性等方面。中国专利申请数量最多,为杜仲叶专利主要申请国,但各领域专利数量均较少,仍具有较高的开发潜力。结论本综述客观地总结了杜仲叶研究热点与专利授权现状,为今后研究与临床应用提供参考。
