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1.
ACS Appl Mater Interfaces ; 15(48): 56547-56555, 2023 Dec 06.
Artigo em Inglês | MEDLINE | ID: mdl-38006332

RESUMO

In the quest for more efficient and cost-effective electrocatalytic systems, careful selection of catalysts and substrates plays a pivotal role. This study introduces an approach by synthesizing and depositing NiFe-layered double hydroxide (NiFe-LDH) catalysts on commercial AISI 304 substrates by using a low-temperature spray-coating technique. Through systematic investigations, the influence of processing conditions, such as the synthesis, ultrasonic power for having a stable nanoparticle's dispersion, and spray cycle optimization on the electrochemical and morphological properties of the coatings, is thoroughly explored. The results showcase exceptional catalytic performance, achieving an overpotential of 230 mV at 10 mA/cm2, with enhanced stability even at high current densities of 500 mA/cm2. The study highlights the significance of meticulous processing optimization and presents a scalable methodology that holds great potential for developing catalysts for oxygen evolution reactions (OER) and facilitates their integration into industrial processes.

2.
Iatreia ; Iatreia;18(2): 177-184, jun. 2005. ilus, graf
Artigo em Espanhol | LILACS | ID: lil-406212

RESUMO

Se revisa el caso de un paciente de ocho meses de edad, con acondroplasia y síntomas sugestivos de compresión cervicomedular. Los síntomas incluían convulsiones tónico-clónicas generalizadas, irritabilidad, episodios frecuentes de apnea, control cefálico nulo, flacidez generalizada, reflejos osteotendinosos abolidos y fontanela abombada. Los estudios radiológicos incluyeron tomografía computarizada (TC) y resonancia magnética (RM) que mostraron la compresión, y signos de mielopatía cervical crónica, esto último fue confirmado con estudio de potenciales evocados somatosensoriales (PESS) preoperatorios del nervio mediano. Al paciente se le hicieron descompresión de la fosa posterior y laminectomía de C-1. La monitorización con PESS intraoperatorios continuos se usó para observar los cambios electrofisiológicos que se pueden presentar con la descompresión medular, y además para ayudar a determinar la extensión de la descompresión requerida.


Assuntos
Acondroplasia , Potenciais Evocados , Potenciais Somatossensoriais Evocados , Lactente
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