A combination of analytical methods to evaluate the effect of humidity aging on the painting materials of icon models

Issa, Yousry M.; Abdel-Maksoud, Gomaa; Ibrahim, Medhat; Magdy, Mina

doi:10.1016/j.vibspec.2019.103010

Cited by 13 publications

(5 citation statements)

References 31 publications

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“…Although PM6 is relative as compared with a higher level of theory, but still of concern for many applications as indicated in the present work. This finding is in good agreement with the previous findings [46][47][48][49].…”

Section: Resultssupporting

confidence: 94%

Semiempirical Molecular Modeling Analyses for Graphene/Nickel Oxide Nanocomposite

2020

Lett Appl NanoBioSci

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Graphene metal oxide composite show applications in many areas according to their excellent electronic properties. Accordingly, graphene was subjected to interaction with NiO as adsorbing and a complex state. Semiempirical quantum mechanical calculations at PM6 was used to study the total energy, the final heat of formation, ionization energy, total dipole moment as well the charge distribution of the surface of graphene metal oxide composite. Calculated data indicated that graphene symmetry is changed into the C1 point group, forming stable composites with NiO that the complex composites were more stable compared with adsorb state composites. The change in the partial charge of graphene is responsible for the change in total dipole moment and hence affecting the increase in the reactivity of graphene/nickel oxide composite.

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Section: Resultssupporting

confidence: 94%

Semiempirical Molecular Modeling Analyses for Graphene/Nickel Oxide Nanocomposite

2020

Lett Appl NanoBioSci

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“…The aging process led to significant changes in the total color difference of the aged untreated sample. It was noticed that the lowest and highest changes of the treated and aged treated samples compared to the aged untreated samples in ΔE* were less than 3, which is not observable by the naked eye as was reported by Issa et al (2020), Abdel-Maksoud et al (2020); Abdel-Maksoud and Khattab (2021); and Abdel-Nasser et al (2022).…”

Section: Resultsmentioning

confidence: 66%

Evaluation of the efficiency of polyacrylamide and poly(MMA-HEMA) for the consolidation of vegetable-tanned leather artifacts

Abdel-Maksoud

Abdallah

Youssef

et al. 2022

PRT

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Purpose This study aims to evaluate the efficiency of using some polymers at different concentrations in the consolidation of vegetable-tanned leather artifacts. Design/methodology/approach New vegetable-tanned leather samples were prepared. The consolidants used were polyacrylamide (PAM) and polymethyl methacrylate/hydroxyethyl methacrylate (MMA-HEMA). Accelerated heat aging was applied to the untreated and treated samples. Analytical techniques used were Fourier transform infrared spectroscopy (FTIR), digital microscope, scanning electron microscope (SEM), change of color and mechanical properties. Findings The characteristic FTIR bands showed the effect of accelerated heat aging on the molecular structure of the studied samples, but treated and aged treated samples used were better than aged untreated samples. Microscopic investigations (digital and SEM), and mechanical properties proved that 2% was the best concentration for polymers used. The change in the total color difference of the treated and aged treated samples was limited. Originality/value This study presents the important results obtained from PAM and poly(MMA-HEMA) used for the consolidation of vegetable-tanned leather artifacts. The best results of the studied polymers can be applied directly to protect historical vegetable-tanned leathers.

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“…FTIR became vital in the conservation field.it can be used for deferent purposes (deterioration detectionand evaluation of the conservation materials and methods,especially in the experimentalstudies [66][67][68][69][70][71][72] according to Shahack-Grosset al [73], Fourier transform infra-red (FTIR) spectroscopy used to analyse the stains and distingusied between different stains. It can also be used for the identifiction of the effect of stains on bone components, especially for collagen.…”

Section: Fourier Transform Infrared (Ftir) Spectroscopymentioning

confidence: 99%

Different Cleaning Techniques for Removal of Iron stain from Archaeological Bone Artifacts: A Review

2021

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Archaeological bone artifacts are found in different locations in Egypt, and they represent multiple values that should be preserved from different deterioration factors. Iron contamination is considered one of the most aspects of deterioration for bones extracted from excavation areas. This study aims to make an integrated study for the first time on the formation of iron rust stain on archaeological bones, explain the aspects and mechanism of its deterioration, explain traditional and advanced techniques of cleaning used for stain removal, and presents the analysis and investigations used to explain the deterioration mechanism or evaluate the materials and methods used in this process. The nature and formation of iron stain and its effect on archaeological bone components were explained. The cleaning techniques (mechanical, chemical, laser, and plasma) for removing it were discussed. Some analyses and investigations [such as different types of microscopes, X-ray fluorescence, Atomic absorption, fourier transform infrared (FTIR) spectroscopy, etc.] that can be used in this process were mentioned. The results confirmed that iron is present within sediments can lead to the breakdown of collagen. It can cause an increase in the porosity of bone artifacts. Hydroxyapatite can undergo alterations such as ionic exchange, cationic exchange, and substitution of phosphate with carbonate. All cleaning techniques have many advantages and some disadvantages. The choice of method for cleaning of iron rust stain depends on the condition and size of the bone piece, and on the thickness and nature of the iron stain.

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A combination of analytical methods to evaluate the effect of humidity aging on the painting materials of icon models

Cited by 13 publications

References 31 publications

Semiempirical Molecular Modeling Analyses for Graphene/Nickel Oxide Nanocomposite

Semiempirical Molecular Modeling Analyses for Graphene/Nickel Oxide Nanocomposite

Evaluation of the efficiency of polyacrylamide and poly(MMA-HEMA) for the consolidation of vegetable-tanned leather artifacts

Different Cleaning Techniques for Removal of Iron stain from Archaeological Bone Artifacts: A Review

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