Search results for "Clay"
showing 10 items of 349 documents
CLAYS IN COSMETICS AND PERSONAL-CARE PRODUCTS
2021
Clays are used in various cosmetic formulations, such as sunscreens, toothpastes, deodorants, creams, hair cosmetics, makeups, nail polish, facial masks, and shampoos, among others, to improve the organoleptic and physicochemical characteristics, to increase the stability, or to facilitate elaboration. Together with their technological functionalities, clays are cosmetologically active ingredients with cleaning, anti-aging, anti-wrinkling, and sun-care functionalities. Talc, kaolinite, mica, and some smectites are the clay minerals used most frequently in cosmetic products, but several other phyllosilicates as well as modified and synthetic clays are also used. Sometimes, clays are useful i…
The role of the clay in morphology modification of the uncompatible polymer blends
2011
Metronidazole/montmorillonite nanodevices for controlled drug delivery
2014
Benchmark study of undrained triaxial testing of Opalinus Clay shale: Results and implications for robust testing
2021
Triaxial testing of argillaceous rocks and shales is significantly more challenging than conventional rock mechanical testing. The challenges are mainly related to the very low permeability of these geomaterials, and their sensitivity to exposure of atmosphere and brines, which induces variations of water content, suction and effective stress. There are currently no international standards to guide service laboratories for robust testing procedures for shales. A benchmark study of undrained triaxial testing was therefore initiated with three leading service laboratories in shale testing, performing 13 tests and using two different methods of establishing sample saturation prior to deformati…
De Bibracte à Augustodunum : permanences et évolutions des activités manufacturières de l’époque gauloise à la fin du Haut-Empire
2007
L’importance de l’artisanat autunois et son développement jusqu’au iiie siècle prennent racine à Bibracte qui a su exploiter les ressources naturelles de son environnement et parfaire un savoir-faire local ayant survécu à la conquête. Les recherches sur ces activités manufacturières menées conjointement à Bibracte et à Autun nous offrent ainsi une opportunité d’étudier ces problématiques sur la durée. À Bibracte, puis à Autun, les artisans du métal sont omniprésents, mais d’autres métiers, aux témoins plus discrets, ont pu aussi êtres identifiés. Dans le cadre de cet article, nous présentons succinctement les lieux de production et un bilan des différents corps de métier. Enfin, nous évoquo…
Polyolefin/clay nanocomposite drawn fibres with and without compatibilizer: structural analyses and mechanical performance
2008
Clay nanocomposites based on functionalized polyethylene. Effect of the clay modifier and the preparation conditions
2009
Use of the eggshells in removing heavy metals from waste water - the process kinetics and efficiency
2019
Studies of the efficiency of Ni, Cu and Cd cations removal from water solutions were carried out, with the use of clay limestone, hen eggshells from eggs for consumption and hen eggshells after hatching, which main element is calcium carbonate. Hen eggshells are a waste product, which can be used as a substitute of clay limestone in removing heavy metals from wet flue gas desulphurisation installation. Mixed solutions of Ni, Cu and Cd were used in the research, with the composition similar to the waste water from wet flue gas desulphurisation installation: Ni (0.009-0.053 mmol/dm3), Cu (0.008-0.057 mmol/dm3)and Cd (0.003-0.008 mmol/dm3). The metals were determined by flame atomic absorption…
Effect of short homopolymer on structure and gelation of aqueous laponite dispersions
2007
Physical-chemical properties and possible applications of clay minerals and humic acid composite materials
2019
Article Pollution caused by pharmaceuticals has become an increasingly serious issue, therefore innovative and cost – effective methods of pharmaceutical’s removal must be studied. Clay – humic acid composite materials can be considered as prospective and low cost sorbents for contaminants. The aim of this study is to develop clay mineral and humic acid composite materials and to characterise their possible applications. For this research, three types of clay minerals (montmorillonite, kaolinite and bentonite) were modified with three types of humic substances: technical humic acid from lignite, humic substances extracted from raised bog peat and technical K humate from lignite. The sorptio…