Material Analysis
Amin Hemmati Yadkuri; Ardeshir Shokrollahi; Habibollah Khajehsharifi
Abstract
Scanometric method has been attended for the study and determination of different analytes. This method coupled with preconcentration methods for improvement the detection limit and applied for the determination of Nile blue and Rhodamine B in binary systems.In this work cloud point extraction-scanometry ...
Read More
Scanometric method has been attended for the study and determination of different analytes. This method coupled with preconcentration methods for improvement the detection limit and applied for the determination of Nile blue and Rhodamine B in binary systems.In this work cloud point extraction-scanometry (CPE-SC) method was used for preconcentration, simultaneous separation and determination of trace amounts of the rhodamine B (RhB) and Nile blue A (NBA) in aqueous solutions. Some of the advantages of this method are simplicity, cheapness, novelty, rapidity, sensitivity, and safety. Analysis of images obtained from the solution scanning after cloud point extraction of the cited dyes and dilution with proper solvent is done using the RGB program in Visual Basic 6 (VB 6) media. Using three red, green, and blue factors, the RhB and NBA contents were investigated in the aqueous solution. Detection limits of the determination of these dyes were acceptable, and their values were 0.002 and 0.008 µg/mL for NBA and RhB, respectively. The linear ranges of the mentioned method for determining Nile blue A and rhodamine B are 0.01–1.33 µg/mL and 0.01–1.00 µg/mL, respectively.
Material Analysis
Sourav Singha Roy; Sriparna Sarkar; Debashis Chakraborty
Abstract
The limited availability of fossil fuels on the Earth has led researchers to develop new materials that are derived from renewable feedstocks. The polymers produced from the ROP of cyclic esters like (LA and ɛ-CL) are biodegradable, biocompatible, and bioassimilable and thus find major applications ...
Read More
The limited availability of fossil fuels on the Earth has led researchers to develop new materials that are derived from renewable feedstocks. The polymers produced from the ROP of cyclic esters like (LA and ɛ-CL) are biodegradable, biocompatible, and bioassimilable and thus find major applications in various field. The ROP are catalyzed by the metal-based organometallic catalyst and metal-free organocatalyst. This review exemplifies the living and immortal ROP. The advantage of such polymerization is that they produce polymers with controlled molecular weight distribution. For the immortal ROP, more than one polymer chain grows from the single catalytic site in the presence of chain transfer agents (CTAs), and thus catalyst loading is low, which make the process economically more viable. The nature of CTAs and loading of CTAs with respect to the catalyst is crucial as the catalyst should be effective in the presence of CTAs. The review also discusses functionalized CTAs employed for the polymerization in some instances where functionalized polymers are generated.
Biomaterials & Biodevices
Manuel Aparicio-Razo; José Luis Jr. Mongalo-Vázquez; J. A. Yáñez Ramos; Adolfo Navarro-Zárate; Víctor Hugo Santos-Enríquez; Israel Vivanco-Pérez; J. Flores Méndez; Genaro Alberto Paredes-Juárez
Abstract
This review article presents the biological and technological properties of biomaterials: titanium, polyetheretherketone, zirconium and Si3N4, focused on the application of dental implants. The methodology focused on examining different works related to the topics of biocompatibility, biofilm formation ...
Read More
This review article presents the biological and technological properties of biomaterials: titanium, polyetheretherketone, zirconium and Si3N4, focused on the application of dental implants. The methodology focused on examining different works related to the topics of biocompatibility, biofilm formation and adhesion properties, fibroblast proliferation, bone resorption, peri-implant infection, osseointegration, histology, cytotoxicity, toxicity, carcinogenicity, genotoxicity, hemocompatibility, vascularization, mechanical resistance and approval for use by the FDA. The results of the review show that all four biomaterials have favorable properties that can revolutionize implants, however, more studies are needed to confirm the results in the short and medium term.
)
)