Background:  Magnetotactic bacteria are a heterogeneous group of Gram-negative prokaryote cells that produce linear chains of magnetic particles called magnetosomes, intracellular organelles composed of magnetic iron particles. Many important applications have been defined for magnetic nanoparticles in biotechnology, such as cell separation applications and  acting as carriers of enzymes, antib...

the dried nitrate-urea gels exhibit the combination of autoicatatric combustion behavior and ultrasonic, whichcan be used to synthesize the nanocatalyst ferrite powders. cu and ni unites nanocatalyst powders sithcomposition of caned], and nife204 were synthesized by a sol-gel auto catalnic combustion process. themolar ratio between metal ions and urea was 11.2. the sob gel process was done at 8...

In this paper, calcium iodate nanoparticles were first synthesized by the modified reaction of Ca(NO3)2 and KIO3 in an aqueous medium under ultrasonic irradiation. The structure nanocatalyst was then characterized FT-IR, FESEM, EDX, XRD, BET techniques. Afterward, fabricated Ca(IO3)2 applied as a facile synthesis heterocycles including quinoxalines, 5,6-dicyano pyrazines, pyrido[2,3-b]pyrazines...

Nuclear magnetic spin-lattice relaxation in dynamically heterogeneous systems is generally coupled; that is, the rapidly moving liquid components do not relax independently of the rotationally immobilized or solid components. The consequences of this coupling are that the generally observable relaxation rates of the liquid components may not be interpreted using the standard theories of liquid ...

The focus of this research lies on fundamental research to provide guidelines for the design of new nanocatalyst toward improvement of the performance of proton exchange membrane fuel cells (PEMFCs). To achieve this overarching goal, several specific steps were taken with aims to: (1) provide guidelines for the design of new catalysts; (2) promote nanocatalyst applications towards alternative e...

Bimetallic nanoparticles have attracted significant attention as their electrochemical and catalytic properties being superior to those of the individual component nanoparticles. In this study, gold-silver hybrid nanoparticles (AuAgNPs) with an Aucore-Agshell nanostructure were successfully synthesized on zinc oxide (ZnO) whiskers. The as-prepared nanocatalyst, denoted AuAgNPsZnO whisker, exhib...

Designing and building an ideal catalyst for organic reactions is needed to increase the efficiency, reaction conditions, reduce its environmental impacts. The growth of nanotechnology realized in production various nano-level catalysts different applications. as-synthesized nanocatalysts are easily manipulated a desired shape size with high surface area volume ratio, which their critical prope...