Results 71 to 80 of about 192,249 (245)
O betão por trás do microscópio [PDF]
, 2019 A secção UAciência é coordenada pelo Professor Universitário Armindo Rodrigues.O betão é um material de construção muito usado nas nossas casas, em edifícios e em obras de arte da engenharia civil, como as barragens, os viadutos, as pontes e os túneis ...
Medeiros, Sara Maria Teixeira
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Oxidation reactions of derivatives of cis-octalins promoted by thallium trinitrate (TTN) [PDF]
, 2008 The reaction of ten cis-octalins and cis-octalones with thallium trinitrate (TTN) leads to different products, depending mainly on the substitution pattern of the substrate. Functionalized cis-hydrindanes were obtained from the reaction of 1,2,3,4,4a,5,8,
CARNEIRO, Vânia M. T. +3 more
core +2 more sources
Shape‐Morphing Nanoengineered Hydrogel Ribbons as Hemostats
Advanced Functional Materials, EarlyView.This study introduces a self‐assembling, shape‐morphing nanoengineered hydrogel ribbon system that rapidly forms porous aggregates in situ for efficient hemostasis in trauma and surgical applications. Abstract Rapid and effective hemorrhage control remains a major challenge in trauma and surgical care, particularly for complex or noncompressible wounds.
Ryan Davis Jr +9 more
wiley +1 more source
Metodologia para tratamento de clorofórmio comercial para uso em separações cromatográficas. [PDF]
, 2013 bitstream/item/74946/1/pub-145 ...
BIZZO, H. R. +3 more
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Introducing Pure Calcium Orthophosphate Gels and Aerogels
Advanced Functional Materials, EarlyView.The synthesis of calcium phosphate‐based gels and aerogels is reported, which exhibit highly porous structures built up of networks of nanoparticles. In case of amorphous aerogels, this leads to yet unmatched specific BET surface areas, making these materials especially interesting for biomedical applications.
Oliver Jeske +4 more
wiley +1 more source
Production of silica gel from residual rice husk ash
Química Nova, 2011 This paper presents a study on the production of silica gel in hydrothermal process using residual rice husk ash. Measurements of the chemical composition, X-ray diffraction, infrared spectroscopy, particle size distribution, and pozzolanic activity were
Samantha Pinheiro Buás de Lima +6 more
doaj +1 more source
Advanced Functional Materials, EarlyView.The ultrahard teeth of mollusks that feed on rocky substrates contain a wear‐resistant coating on their surfaces consisting of densely packed mesocrystalline magnetic nanoparticles within an organic matrix. These coatings display significant hardness and toughness through their highly controlled mesocrystalline architectures.
Taifeng Wang +7 more
wiley +1 more source
Sílica gel obtida de escória de alto forno: Marabá, Pará
Cerâmica, 2015 ResumoSílica gel com propriedades similares à sílica comercial foi obtida a partir de escória de alto forno (EAF), utilizando digestão com ácido clorídrico. A EAF-sílica obtida foi caracterizada por diferentes técnicas, mostrando-se amorfa, com pureza 99,
M. M. Rebelo +2 more
doaj +1 more source
Síntesis de nuevas triarilfosfinas carboxiladas mediante hidrólisis del grupo trifluorometilo. Aplicaciones en catálisis de intercambio de fase y anclaje sobre sílica [PDF]
, 2012 En el presente trabajo se describe una nueva familia de ligandos trifenilfosfina con sustituyentes trifluorometilo y ácidos carboxílicos. Se ha desarrollado un procedimiento sintético optimizado para estos compuestos, en el que se parte de derivados ...
Bayón, Joan Carles +3 more
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Using the Photostationary State of Arylazopyrazoles to Control Phase Transitions of Liquid Crystals
Advanced Functional Materials, EarlyView.A series of new arylazopyrazole photoswitches is designed as dopants for liquid crystalline materials. Unprecedented, the distribution of photoisomers at the photostationary state upon irradiation with light of specific wavelengths (365, 460, 520 nm) is used to control the liquid crystalline phase transitions under isothermal conditions, including ...
Tobias Thiele +3 more
wiley +1 more source