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American Journal of Materials Engineering and Technology
Number of Followers: 3  Open Access journalISSN (Print) 2333-8903 - ISSN (Online) 2333-8911 Published by Science and Education Publishing  [75 journals]
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- Ruthenium (IV) Oxide (RuO2) and Ruthenium (VIII) Oxide (RuO4) Smart Nano
Particles, Nano Capsules and Nanoclusters Influence, Impression and
Efficacy in Cancer Prevention, Prognosis, Diagnosis, Imaging, Screening,
Treatment and Management under Synchrotron and Synchrocyclotron Radiations
Authors: Alireza Heidari; Margaret Hotz, Nancy MacDonald, Victoria Peterson, Angela Caissutti, Elizabeth Besana, Jennifer Esposito, Katrina Schmitt, Ling-Yu Chan, Francesca Sherwood, Maria Henderson, Jimmy Kimmel
Pages: 1 - 20
Abstract: In the current research, annealing effects on the interband transition and optical constants of Ruthenium (IV) Oxide (RuO₂) and Ruthenium (VIII) Oxide (RuO4) nano thin films in cancer cells, tissues and tumors under synchrotron and synchrocyclotron radiations is investigated. The calculation of thickness and optical constants of Ruthenium (IV) Oxide (RuO₂) and Ruthenium (VIII) Oxide (RuO4) annealing effects on the interband transition and optical constants of Ruthenium (IV) Oxide (RuO₂) and Ruthenium (VIII) Oxide (RuO4) nano thin films in cancer cells, tissues and tumors under synchrotron and synchrocyclotron radiations produced using sol-gel method over glassy medium through a single reflection spectrum is presented. To obtain an appropriate fit for reflection spectrum, the classic Drude-Lorentz model for parametric di-electric function is used. The best fitting parameters are determined to simulate the reflection spectrum using Lovenberg-Marquardt optimization method. The simulated reflectivity from the derived optical constants and thickness are in good agreement with experimental results.
PubDate: 2021-08-19
DOI: 10.12691/materials-9-1-1
Issue No: Vol. 9, No. 1 (2021)
- Elaboration of Porous Geopolymer Cement from Sangaré Clay and Shell Egg
Powder: Application as Thermal Insulation
Authors: Jeanne Atchana; Paul Nestor Djomou Djonga, Benoit Loura, Valery Gomdje Hambate, Jean Bosco Tchatchueng
Pages: 21 - 30
Abstract: This study focuses on the preparation of porous geopolymer cements for thermal insulation applications using commercial calcium carbonate and low-value calcium carbonate-rich waste such as eggshell powders as pore-forming agents. The control and porous geopolymer cements were prepared by adding phosphoric acid (4M) as a chemical ingredient to metakaolin containing 0 and 10 wt% of the foaming agent. Results showed that Sangare clay is sandy with a few silts and traces of gravel. Diffractogram of the clay indicates the presence of: Kaolinite (Kao); Illite (Ill); Quartz (Qz) and Potassium Feldspars (Fds). This was confirmed by the Infrared spectrum of the material where bands characteristic of the presence of kaolinite (3689-3649 cm -1) and of other minerals have been found. Characterization of eggshell powder shows that the source of calcium consists mainly of CaCO3. The apparent densities of geopolymer cement obtained decreased when the aluminosilicate materials (metakaolin) are replaced by proportions of eggshell powders and commercial calcium carbonate (0, 1, 3, 5, 7 and 10%). It was also observed that the compressive strengths of geopolymer cements based on eggshells are greater than those based on commercial calcium carbonate and the thermal conductivity decreases with the increase of the porogen. These results corroborates with that of the apparent density and compressive strength which decreases with the increase of the porogen. Results shows that geopolymer cements obtained have accumulated high pores in their structures. The values of thermal conductivity of the control and porous geopolymer cement from eggshell ranges between 0.10 and 0.17 W/mK, respectively. It was concluded that the low-value calcium carbonate-rich wastes (egg shell) could be used for producing porous geopolymer cements which could be utilized for thermal insulation applications.
PubDate: 2021-10-24
DOI: 10.12691/materials-9-1-2
Issue No: Vol. 9, No. 1 (2021)
- Adaptive Camouflage Textiles with Thermochromic Colorant and Liquid
Crystal for Multidimensional Combat Background, a Technical Approach for
Advancement in Defence Protection
Authors: Md. Anowar Hossain
Pages: 31 - 47
Abstract: Adaptive camouflage textiles with color changing and blending into the combat background (CB) and surrounding environments have been a great challenge for the color scientist. Defense professional urgently needs adaptive camouflage textiles for personal protection in extreme weather conditions and multidimensional CB environments. A technical approach of adaptive camouflage textiles can be formulated by using a novel combination of thermochromic colorant and liquid crystal. Absorption of heat can rapidly accelerate the thermal response of thermochromic liquid crystal (TLC) by changing molecular structure with thermo-color-light (TCL) mechanism of absorption and reflection of light at different wavelength. TLC shows chameleon performance of color tone which changes the light reflection of surface color; thus, target objects can be artificially confused by the replacement of chromatic appearance in multidimensional CB environments. TLC can be applied as deceiving mechanism and surface modification of textile substances with combination of dyes/pigment. TLC modified camouflage textiles have possibility of diverse applications in different weather of combat zone for defense actions and different CB environments. A single formulated camouflage textiles may be suited with different CB environments under TLC mechanism. Chameleon type of color tone in cooling and heating conditions of thermochromic changes automatically in both reversible and irreversible way. Therefore, the technical colorant combination has been preached for suitability of adaptation with surrounding CB. TLC treated textiles can be experimented with spectroscopic, microscopic, and photographic illumination. The applications of adaptive camouflage textiles are not only limited to military textiles, but also the principle of technologies have versatile applications for clothing of personal protection including fashionable garments production.
PubDate: 2021-12-16
DOI: 10.12691/materials-9-1-3
Issue No: Vol. 9, No. 1 (2021)
