New cellulosic titanium dioxide nanocomposite as a protective coating for preserving paper-art-works     

Maryam Afsharpour  Fereshteh T. Rad  Hamid Malekian 《Journal of Cultural Heritage》2011,12(4):380

We investigate the TiO₂ role in the inherent protection of paper works of art to protect them against damaging effect of ultraviolet radiation, pollutant gasses, mold and bacteria. In this study a cellulosic nanocomposite of TiO₂ were used as protective coating on the surface of paper fibers. This layered nanocomposite can act as a consolidate materials too. Furthermore, to determine how well paper works screen objects from the damaging effects, two accelerated aging mechanisms due to light and heat are discussed. Results show good stability of papers with nanocomposite coating. Also, a good light stability was shown in the colored paper that treated with this nanocomposite. Furthermore, to demonstrate the degree of antifungal properties of coated papers, papers were treated with two common molds and the good preventive effect of coated paper against molds is described.  相似文献   

Multifunctional nanocomposites for paper conservation     

《文物保护研究》2013,58(1):23-29

Abstract

Upon aging, paper documents and books become progressively damaged. Paper deacidification is a fundamental conservation intervention. In this study, we report on the use of nanoparticles of titanium dioxide (TiO₂) and magnesium hydroxide (Mg(OH)₂) associated with hydroxyethylcellulose (HEC) to inhibit acidification, photo-induced degradation, and biodeterioration of paper. With the aid of ultrasound, Mg(OH)₂ nanoparticles with a narrow size distribution can be obtained through homogeneous precipitation in water. Furthermore, to demonstrate the efficacy of the nanocomposite and the performance of treated and untreated paper, photo- and thermal-induced degradation is discussed. The results show that using the controlled double-jet precipitation (CDJP) it is possible to synthesize Mg(OH)₂ particles with a narrow size distribution (18–87 nm). The nanocomposite of Mg(OH)₂–TiO₂–HEC increases the durability of paper by imparting fungal growth resistance (D = 34.6 mm), moderate alkalinity (pH = 8.4), mechanical reinforcement (from 817–896 N/m), and UV protection. Additionally, there is a slight color difference (ΔE* = 0.8) between the treated and untreated paper. Both photodegradation and thermal degradation indicate that the paper treated with this nanocomposite (Mg(OH)₂–TiO₂–HEC) has increased stability.  相似文献   

聚β-羟基丁酸PHB/蒙脱土纳米复合材料的结构与力学性能     

张水生  刘爱珍 《德州学院学报》2005,21(4):23-25

用溶液复合法成功地制备了插层型PHB/蒙脱土纳米复合材料.采用X射线衍射(XRD)和透射电子显微镜(TEM)研究了复合材料的结构,发现硅酸盐片层间距从1.8 nm升至 2.4 nm左右.同时研究了复合材料的结晶,熔融,和力学性能,发现有机蒙脱土的加入,可以加快PHB的结晶速度,降低熔融温度,提高了材料的力学性能,有机蒙脱土含量在3%时,其综合性能最佳.  相似文献