3D laser Raman micro-spectroscopy of Er3+ and Yb3+ co-activated nano-composite phosphosilicate for industrial photonics applications

2022

Giza plateau in Egypt is famous for its pyramids and tombs which were built and carved into the rock. The pyramid of Queen Hetep Heres, the mother of King Khufu, encountered several erosion factors. From a simple visual examination, it is noted that Hetep Heres' pyramid has many problems that affect its sustainability. Different samples have been taken from the eroded areas. The external state that was investigated by a stereo microscope shows erosion and damage. The internal and structural states were investigated by scanning electron microscope, X-ray diffraction, EDAX, and laser-based Raman microscope. This study confirms the need to interfere with the surrounding urban area to decrease the frictions and the strong need to continue developing the Giza Plateau to decrease the environmental effects on the whole archeological buildings found in one of the most important plateaus in the world.

Section: Climatic Characteristicsmentioning

confidence: 99%

Utilizing Laser Spectroscopic Investigations to Determine the Current Conditions of Hetep Heres Pyramid in Giza, Egypt.

2022

“…Chitosan could be easily soluble in water or slightly acidic water. [20][21][22][23] Spectroscopy always plays a crucial role in analyzing any new samples, the spectroscopic tools of analysis in molecular identification such as FTIR, Raman, and molecular modeling could help assign vast spectra of samples from the archeological samples to the biological samples [24][25][26][27][28][29][30][31][32]. Another kind of spectroscopic tool is atomic spectroscopy like atomic absorption, ICP, and neutron activation which also help in different types of samples like soils and water treatment and biological molecules [33][34][35][36].…”

Section: Egyptian Journal Of Chemistrymentioning

confidence: 99%

Photocatalytic activity of Chitosan/Z gel blind for the Photodegradation of Methyl Orange, for west water treatment

2022

The purpose of this work was to examine the photocatalytic activity of Chitosan/Zn-gel blend film. It is well known that Chitosan can do photo-degradation; Zinc gel was added as a blend to enhance the photo-catalytic behavior of chitosan. Their photocatalytic activities were estimated by the degradation of the used dye from its solution by using the Chitosan/Zn-gel blend film. The influence of operating parameters such as Zn-gel concentration was thoroughly examined to obtain the optimum conditions for photo-catalytic degradation. The particle size for Zn-gel and the dielectric properties for Chitosan/Zngel blend was measured. The kinetics and color photo-degradation efficiency has been calculated based on spectrophotometry. It is found that the prepared blinds are very efficient as photo-catalytic media for the Methyl Orang; the color removal efficiency reached 87% which is great, especially since no complicated preparation followed and also no special irradiation only the sunlight The ε' and ε'' were measured in a frequency range extending from 1 Hz up to 100 kHz. The frequency enhancement results in collapsing of the ε' amounts for all mentioned prepared samples and the ε' appeared independent of frequency.

“…Characterization tools for cultural heritage are of importance for characterizing the archaeological items. Vibrational spectroscopy like FTIR and Raman spectroscopy plays an important role in identifying the item structure on the molecular level [1][2][3][4][5][6]. Combining molecular modeling with the experimental techniques plays a very important role in both assigning the spectral charts and treating the surfaces of the monument with new compounds as protective layers [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Raman Micro-Spectroscopic Investigation of Corrosion Products.

2023

Selected four gilt-bronze statuettes have been studied after excavation from the burial environment. Soil deposits and corrosion forms were observed on the surface disfiguring the gold layer. Confocal micro-Raman spectroscopy and Portable Xray fluorescence (pXRF) were used to identify the molecular structure and elements distribution over the statuette's surfaces. Total internal reflection fluorescence (TIRF) has been utilized to recognize the surface/interface state before the conservation treatment and takes the high-resolution imaging. Chemical analyses indicated that it was made of leaded bronze. A high lead content in the statuettes was reflected by lead corrosion products admixed with green chloride and carbonate salts of copper. Conservation treatment was accomplished using fine and appropriate mechanical tools to recover all the gilding remains and surface details. Finally, the protection process of statuettes was accomplished using two layers of Permalac.