Hydrophobic Zinc Oxide Nanocomposites for Consolidation and Protection of Quartzite Sculptures: A Case Study

2020 ◽  
Vol 63 ◽  
pp. 64-75
Author(s):  
Yasser Kamal Hefni
Keyword(s):  
Zinc Oxide ◽  
Zinc Oxide Nanoparticles ◽  
Archaeological Sites ◽  
Oxide Nanoparticles ◽  
Direct Role ◽  
Water Contact ◽  
Static Water Contact Angle ◽  
Static Water ◽  
Physical And Chemical

Quartzite sculptures are considered some of the most impressive and informative archaeological remains which have been found in the most of Egyptian archaeological sites. Regrettably, quartzite sculptures suffer from many deterioration aspects such as granular disintegration, scaling, cracking, efflorescence, soiling, microbiological colonization. Water is the main aggressive deterioration factor of stones and stone-based monuments, as in addition to its direct role in deterioration mechanisms, it plays as a catalyst in the physicochemical and microbiological deterioration processes.During the last two decades, polymer nanocomposites have widely been applied in the field of cultural heritage conservation due to their unique physical and chemical characteristics. Zinc oxide nanoparticles are among the most important semiconductive nanomaterials that have been applied in the fabrication of nanocomposites. They have been demonstrated to improve the physicochemical and mechanical properties of polymers. In addition, zinc oxide nanoparticles were mixed with polymers in order to fabricate superhydrophobic and self-cleaning protective materials.The aim of this paper is to evaluate the efficiency of zinc oxide nanocomposites, in order to select the best of them for the consolidation and protection of a colossal quartzite statue of Ramesses II. The properties of the treated quartzite samples were comparatively examined by colourimetric measurements, static water contact angle, compressive strength, and scanning electron microscope.

TOXICITY OF ZINC OXIDE NANOPARTICLES ON HUMAN SKIN DERMAL CELLS

2021 ◽  
Vol 9 (Spl-1- GCSGD_2020) ◽  
pp. S95-S100
Author(s):  
Harshyini Maheswaran ◽  
◽  
Ling Shing Wong ◽  
Anto Cordelia Tanislaus Antony Dhanapal ◽  
Ramasamy Thangavelu Narendhirakannan ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Human Skin ◽  
Zinc Oxide Nanoparticles ◽  
Skin Surface ◽  
Oxide Nanoparticles ◽  
Zno Nps ◽  
Skin Cells ◽  
Cosmetic Formulations ◽  
Dermal Cells ◽  
Physical And Chemical

Zinc oxide (ZnO) has special physical and chemical characteristics which enable it to be utilized in numerous applications including electronics, sunscreens, pigments, and most notably in biomedical applications. Nanoemulsions containing zinc oxide nanoparticles (ZnO NPs) are progressively sought-after as an active component in cosmetic formulations and are used in sunscreens, moisturizers, and antiaging products. Zinc paste bandages including Unna boot consist of open wove cotton gauze treated with ZnO paste are now common medicaments for leg ulcers. The damaged and broken skins are vulnerable to ZnO NPs uptake. This being the case, ZnO NPs on the skin surface can affect the functions of surrounding cells in numerous ways by penetrating into the skin cells. This could exert toxicity effects on the skin cells over time depending on the concentration and site of ZnO NPs exposure. This review brings together some findings regarding the toxicity of ZnO NPs on human skin dermal cells and thus in turn enlightens the safer usage of ZnO NPs in skin care applications.

Nanomaterials for Consolidation and Protection of Egyptian Faience Form Matteria, Egypt

2019 ◽  
Vol 56 ◽  
pp. 39-48 ◽  
Author(s):  
Mohamed M. Ibrahim ◽  
Sherif O. Mohamed ◽  
Yasser K. Hefni ◽  
Ahmed I. Ahmed
Keyword(s):  
Technical Information ◽  
Direct Role ◽  
Water Contact ◽  
Ancient Egyptian ◽  
Static Water Contact Angle ◽  
Total Immersion ◽  
Static Water ◽  
Archaeological Materials ◽  
Soluble Components ◽  
Scanning Electron

Egyptian faience is one of the most important archaeological materials that contain a lot of historical and technical information about ancient Egyptian civilization. Unfortunately, the Egyptian faience objects subject to many deterioration factors, especially humidity. Water has a direct role in dissolving the soluble components, it accelerates the physiochemical deterioration processes. In the present study, four types of ready to use nanoproducts were evaluated. It was done to select the best of them to consolidate and protect some archaeological faience from Matteria magazine. The properties of the treated samples, were comparatively investigated by colormetric measurements, static water contact angle, total immersion water absorption, compressive strength, and scanning electron microscope.

scholarly journals Biological interaction levels of zinc oxide nanoparticles; lettuce seeds as case study

Heliyon ◽  
2020 ◽  
Vol 6 (5) ◽  
pp. e03983
Author(s):  
Rabeah Yousef Rawashdeh ◽  
Amal Mohammad Harb ◽  
Asma Mahmoud AlHasan
Keyword(s):  
Zinc Oxide ◽  
Zinc Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Biological Interaction ◽  
Lettuce Seeds

scholarly journals Synthesis Approaches of Zinc Oxide Nanoparticles: The Dilemma of Ecotoxicity

2017 ◽  
Vol 2017 ◽  
pp. 1-14 ◽  
Author(s):  
Ayesha Naveed Ul Haq ◽  
Akhtar Nadhman ◽  
Ikram Ullah ◽  
Ghulam Mustafa ◽  
Masoom Yasinzai ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Zinc Oxide Nanoparticles ◽  
Environmental Remediation ◽  
Chemical Properties ◽  
Cost Effective ◽  
High Energy ◽  
Oxide Nanoparticles ◽  
Chemical Waste ◽  
Biological Methods ◽  
Physical And Chemical

Human’s quest for innovation, finding solutions of problems, and upgrading the industrial yield with energy efficient and cost-effective materials has opened the avenues of nanotechnology. Among a variety of nanoparticles, zinc oxide nanoparticles (ZnO) have advantages because of the extraordinary physical and chemical properties. It is one of the cheap materials in cosmetic industry, nanofertilizers, and electrical devices and also a suitable agent for bioimaging and targeted drug and gene delivery and an excellent sensor for detecting ecological pollutants and environmental remediation. Despite inherent toxicity of nanoparticles, synthetic routes are making use of large amount of chemical and stringent reactions conditions that are contributing as environmental contaminants in the form of high energy consumption, heat generation, water consumption, and chemical waste. Further, it is also adding to the innate toxicity of nanoparticles (NPs) that is either entirely ignored or poorly investigated. The current review illustrates a comparison between pollutants and hazards spawned from chemical, physical, and biological methods used for the synthesis of ZnO. Further, the emphasis is on devising eco-friendly techniques for the synthesis of ZnO especially biological methods which are comparatively less hazardous and need to be optimized by controlling the reaction conditions in order to get desired yield and characteristics.

scholarly journals An Optimized Anti-adherence and Anti-biofilm Assay: Case Study of Zinc Oxide Nanoparticles versus MRSA Biofilm

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Hefa Mangzira Kemung ◽  
Loh Teng-Hern Tan ◽  
Kooi Yeong Khaw ◽  
Yong Sze Ong ◽  
Chim Kei Chan ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Zinc Oxide Nanoparticles ◽  
Oxide Nanoparticles

Optical Characteristics of Zinc Oxide Nanoparticles with Surface Modification Using Polyethylene Glycol

2014 ◽  
Vol 29 (10) ◽  
pp. 1039
Author(s):  
TAN Man-Lin ◽  
WANG Yan-Tao ◽  
ZHANG Wei-Li ◽  
FU Dong-Ju ◽  
LI Dong-Shuang ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Surface Modification ◽  
Polyethylene Glycol ◽  
Zinc Oxide Nanoparticles ◽  
Optical Characteristics ◽  
Oxide Nanoparticles

A comparative study of the antibacterial activity of Quercus robur (Ethanolic extract) and Zinc oxide nanoparticles on Salmonella (In vitro)

2018 ◽  
Vol 9 (SPL1) ◽  
Author(s):  
Hams H. H. Alfattli ◽  
Ghufran Zuhair Jiber ◽  
Ghaidaa Gatea Abbass
Keyword(s):  
Zinc Oxide ◽  
Antibacterial Activity ◽  
Zinc Oxide Nanoparticles ◽  
Quercus Robur ◽  
Ethanolic Extract ◽  
Inhibitory Effect ◽  
Significant Inhibition ◽  
Oxide Nanoparticles ◽  
Inhibition Zones

This study which designed to evaluate the inhibitory effect of Ethanolic extract of (Quercusrobur) and Zinc oxide nanoparticles on the growth of one genus of enterobacteriacae (Salmonella). In vitro. For this purpose graduate concentrates for plant extract (50, 100, 200, 400 )mg/ml which prepared and compared with Zinc oxide nanoparticles of different concentration (2, 1, 0.5, 0.25) μg/ml,and examined. The result showed that the studied medicinal plant has antibacterial activity against this bacteria which used. The result showed that the plant has good activity in decrease the growth of this bacteria. The results of the study also showed that the nano-ZnO has very effective antibacterial action against the studied bacteria which was Salmonella,nanoparticles concentrations lead to increasing in the inhibition zones of tested bacterial growth. We also study the effect of three antibiotics Lomefloxacin (LOM), Ciprofloxacin (SIP) and Rifampin (RA) and the result showed,in a comparison within the tested bacteria,Salmonella had a significant inhibition increase in Lomefloxacin ; the ciprofloxacin showed effect on tested bacteria. However,Rifampin does not show any effect on tested bacteria.

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