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Recently, Wei Bingqing, a professor at Northwestern University of Technology's Nanoenear Materials Research Center, published a paper in Advanced Functional Materials, saying that they used a simple and economical aqueous solution to subtly synthesize calcium hydroxide/graphene quantum dot hybrid nanomaterials and successfully applied them to the protection of three famous Tang tomb murals, with good results.
of ancient collections in the city are being increasingly damaged. Because of its excellent compatibility, inorganic nanomaterials (such as nano-calcium hydroxide) have been widely concerned as a promising mural protection material
china
. But so far, the synthesis method is still expensive, complex to operate, and often uses organic solvents.
Wei Bingqing, a professor at northwestern University of Technology's Nanoenear Materials Research Center, recently published a paper in Advanced Functional Materials, saying that they used a simple and economical water solution to subtly synthesize calcium hydroxide/graphene quantum dot hybrid nanomaterials and applied them successfully to the protection of three famous Tang tomb murals, with good results.
"researchers have come up with a new concept of mural protection by synthesizing calcium hydroxide/graphene quantum dot hybrid nanomaterials. The results show that the particles of hybrid nanomaterials are small and uniform in size, and have strong adhesion, which makes the reinforcement of frescoes more feasible. In addition, hybrid nanomaterials are UV resistant and have better protection than inorderable materials, Wei said.
can be better and longer to extend the life of the mural
" fresco structure from the outside and inside mainly includes pigment layer, white ash layer, grass mud layer, brick wall layer, white ash layer is the main component of calcium carbonate. Wei Bingqing introduced, and the white ash layer is prone to failure leading to damage to the surface of the mural.
Wei Bingqing told Science and Technology Daily that the mural protection materials are mainly divided into organic and inorganic categories. Organic protective materials and frescoes ont of poor compatibility, long-term use of easy aging, brittle yellowing, resulting in mechanical decline. At the same time, due to the formation of the membrane is not breathable, the mural will eventually expand, powder, resulting in the mural can not be repaired.
hydroxide and other inorganical protection materials have good compatibility, anti-aging and other advantages. After being applied to the surface of the fresco, calcium hydroxide reacts with carbon dioxide in the air to produce calcium carbonate, which is integrated with the white ash layer, improving the strength of the white ash layer and playing a protective role. By further nanometifying calcium hydroxide, its surf activity and stability increased significantly, which can extend the life of the frescoes for a better and longer period of time.
The aqueous solution method cleverly synthesizes hybrid nanomaterials
Since 2000, when Italian scholars proposed nano-calcium hydroxide protection frescoes, Chinese and foreign scholars have spent nearly 20 years trying to synthesize nano-calcium hydroxide by means of aqueous solution method, alcohol solution method, micro-emulsion method and calcium metal method. "However, so far, the synthetic calcium hydroxide still has a large size, poor permeability and so on." Team member Zhu Jinmeng told reporters that in addition, slow carbonization, low reinforcement strength and other issues have not been effectively resolved.
around this issue, Wei Bingqing team after a long period of systematic research, creative introduction of graphene quantum dot.
" using the limited-domain effect of graphene quantum dot surfactant, effectively regulated the growth dynamic rate of calcium hydroxide nucleation, thus realizing the controlled synthesis of calcium hydroxide nanomaterials, breaking through the bottleneck that has plagued researchers for many years. Wei Bingqing said.
new research uses simple and economical aqueous solution method to subtly synthesize "calcium hydroxide/graphene quantum dot" hybrid nanomaterials, and puts forward a new concept of mural protection. The results show that the material has small particles (about 80 nanometers), uniform size, and strong adhesion to fresco pigments. Due to the enhancement of graphene quantum dot, calcium hydroxide nanomaterials are completely carbonized into a stable "calcite" phase, which is very important relative to fresco reinforcement.
cultural relics protection urgently need to be closely integrated with the development of new materials
the frescoes mainly include architectural frescoes, grotto frescoes and burial frescoes. New nanomaterials are mainly used in burial frescoes. Tomb frescoes are widely distributed from time and scope, from the 4,200-year-old stone ruins frescoes to the Tang, Song, Yuan, Ming and Qing dynasties have found tomb frescoes, regardless of the quantity and quality of people's great concern.
other Tang tomb murals show all aspects of social life at that time, such as costumes, dance instruments, honor ceremony, traditional culture, fresco protection research is of great significance.
, our country classifies the protection of cultural relics in the field of social sciences, pays attention to the humanities research and neglects the application of new materials and new technologies in the field of cultural relics protection.
, by the Western countries cultural relics protection ideas and technology, China's cultural relics protection concepts and materials technology are mostly learn from the experience of Western countries. Therefore, how to give full play to the advantages of Science and Technology scientists in Our country, combine with the traditional cultural relics protection, and form the concept of cultural relics protection with Chinese characteristics is the difficulty encountered in the process of material science and cultural relics protection research.
Northwestern University of Technology makes full use of the advantages of Shaanxi Province's cultural relics province, and with the Shaanxi Province Archaeological Research Institute and other cultural protection units strong combination, innovatively combined the current new material technology with traditional conservation experience. Wei Bingqing said that the follow-up team will continue to develop more excellent performance mural protection materials, and further promote the application of these materials, so that more ancient murals in urgent need of restoration to be effectively protected.