Zobrazeno 1 - 10
of 193
pro vyhledávání: '"Hamilton Varela"'
Publikováno v:
Materials Science for Energy Technologies, Vol 3, Iss , Pp 508-514 (2020)
The development of low-cost and highly active electrode material is essential for the growth of renewable energy conversion and storage technologies. In this work, a composite of carbon-red phosphorous has been synthesized using a simple chemical rea
Externí odkaz:
https://doaj.org/article/5095895d9a66496d8ea41ec0c2a09d65
Autor:
Ana Maria Borges Honorato, Mohmmad Khalid, Antonio Aprigio da Silva Curvelo, Hamilton Varela, Samaneh Shahgaldi
Publikováno v:
Polymers, Vol 14, Iss 18, p 3781 (2022)
Recently, electro-oxidation of kraft lignin has been reported as a prominent electrochemical reaction to generate hydrogen at lower overpotential in alkaline water electrolysis. However, this reaction is highly limited by the low performance of exist
Externí odkaz:
https://doaj.org/article/90e73c9fd2144c66bd766e389557263f
Publikováno v:
Electrochemistry Communications, Vol 121, Iss , Pp 106853- (2020)
Some electrochemical systems are known to have higher average efficiency when operated under an oscillatory regime. Given the compromise between activity and stability, the stability of electrochemical interfaces in a self-organized, oscillatory stat
Externí odkaz:
https://doaj.org/article/98910e85ae4942e2a2c703f90574d88d
Publikováno v:
Life, Vol 11, Iss 8, p 777 (2021)
Since the pioneering experimental work performed by Urey and Miller around 70 years ago, several experimental works have been developed for approaching the question of the origin of life based on very few well-constructed hypotheses. In recent years,
Externí odkaz:
https://doaj.org/article/373b678e4bde474fa634189a2209522b
Autor:
Raphael Nagao, Hamilton Varela
Publikováno v:
Química Nova, Vol 39, Iss 4, Pp 474-485 (2016)
Spontaneous pattern formation in reaction-diffusion systems was theoretically proposed by Alan M. Turing in 1952. His breakthrough conceptions of chemical self-organization were able to explain how patterns emerge in nature and the symmetry breaking,
Externí odkaz:
https://doaj.org/article/3c7e535165744f9d82de5e832f3b5cea
Publikováno v:
Química Nova, Vol 38, Iss 1, Pp 136-143 (2015)
Spatiotemporal pattern formation in reaction-transport systems takes place spontaneously when the system is kept far from thermodynamic equilibrium. Targets, reaction fronts, waves, spirals, spots and stripes are some typical examples of selforganize
Externí odkaz:
https://doaj.org/article/872dbd8f3d6f409f888a2e425db01d34
Publikováno v:
Química Nova, Vol 35, Iss 2, Pp 348-354 (2012)
We present in this work the influence of temperature on the dynamics of homogeneous chemical systems containing bromate and 1,4-cyclohexanedione (1,4-CHD) in acidic media. In particular, the following systems were studied: bromate/1,4-CHD/acid, broma
Externí odkaz:
https://doaj.org/article/5e6841e729b34ee1b27d54be628e997a
Publikováno v:
Química Nova, Vol 33, Iss 10, Pp 2143-2147 (2010)
We present in this work an experimental investigation of the effect of temperature (from 25 to 180 ºC) in the electro-oxidation of ethanol on platinum in two different phosphoric acid concentrations. We observed that the onset potential for ethanol
Externí odkaz:
https://doaj.org/article/8b9cd7bf6a264c9d9b9703f0ed9c531d
Publikováno v:
Química Nova, Vol 31, Iss 6, Pp 1444-1449 (2008)
It is investigated in the present contribution the oscillatory co-electrodeposition of CuSn on a polycrystalline gold surface in the presence of Triton X-100 surfactant and citric acid as additive, in acidic media. The experiments were conducted unde
Externí odkaz:
https://doaj.org/article/615c7e261c0346e59b588bbe39f9cbf8
Publikováno v:
Química Nova, Vol 30, Iss 8, Pp 1930-1937 (2007)
New chemical systems have been recently designed for the study of complex phenomena such as oscillatory dynamics in the temporal domain and spatiotemporal pattern formation. Systems derived from oscillators based on the chemistry of bromate are the m
Externí odkaz:
https://doaj.org/article/4c2ae39dae9a4f3a875f9e20ddf2a45a