A5079035735- Biodiesel Production and Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Organometallic Complex Synthesis and Catalysis
- Lubricants and Their Additives
- Enzyme Catalysis and Immobilization
- Catalysis for Biomass Conversion
- Nonlinear Optical Materials Studies
- Coordination Chemistry and Organometallics
- Catalysis and Hydrodesulfurization Studies
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Nanocluster Synthesis and Applications
- Mesoporous Materials and Catalysis
- Laser-Ablation Synthesis of Nanoparticles
- Nanoparticles: synthesis and applications
- Nanomaterials for catalytic reactions
- Catalytic C–H Functionalization Methods
- Research on Leishmaniasis Studies
- Electrochemical Analysis and Applications
- Chemical Synthesis and Reactions
- Crystallography and molecular interactions
- Biofuel production and bioconversion
- Nonlinear Photonic Systems
- Supercapacitor Materials and Fabrication
- Malaria Research and Control
Universidade Federal de Alagoas
2016-2025
Institute of Catalysis and Petrochemistry
2021
Sociedade de Ensino Universitário do Nordeste
2015-2021
Center for Effective Philanthropy
2014
Rede de Química e Tecnologia
2014
Universidade Federal do Rio Grande do Sul
1995-2012
Universidade Federal de Minas Gerais
2011
Universidade Luterana do Brasil
2006-2010
Heidelberg University
2002
Centre National de la Recherche Scientifique
1999-2000
The transesterification reactions of castor oil with ethanol and methanol as agents were studied in the presence several classical catalytic systems. effects nature alcohol catalyst on yields monoalkyl fatty acid esters evaluated. results indicate that biodiesel can be obtained by using either or agent. Similar may following ethanolysis methanolysis; however, reaction times required to attain them are very different, methanolysis being much more rapid.
CATALYSIS IN OLEOCHEMISTRY.The use of biomass as raw-material for obtaining chemicals, polymers and fuels is emerging a clever alternative solution the increasing energy demand, environmental awareness petroleum shortage.In this work, some attempts in order to develop catalytic systems suitable triglyceride transformation into fuels, intermediates are reviewed.
In spite of recent efforts to eradicate malaria in the world, this parasitic disease is still considered a major public health problem, with total 216 million cases and 445,000 deaths 2016. Artemisinin-based combination therapies remain effective most parts but resistance Southeast Asia have urged for novel approaches treat caused by Plasmodium falciparum. work, we present chloroquine analogs that exhibited high activity against sensitive chloroquine-resistant P. falciparum blood parasites...
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTBiodiesel Production from Vegetable Oil Mixtures: Cottonseed, Soybean, and Castor OilsSimoni M. Plentz Meneghetti*†, Mario R. Meneghetti†, Tatiana Serra†, Daniela C. Barbosa†, Carlos Wolf‡View Author Information Laboratório de Oleoquímica, Instituto Química e Biotecnologia, Universidade Federal Alagoas, Maceió, CEP 57072-970, Brazil, Faculdade Química, Luterana do Brasil, Canoas, Rio Grande Sul, 92420-280, Brazil* To whom correspondence...
The sputtering of Au targets onto castor oil generates stable spherical gold nanoparticles (AuNPs) 2.4 to 3.8 nm. AuNP size increases with the discharge voltage and mechanism nucleation growth are related energy atoms/clusters ejected from target.
This paper discusses mechanistic aspects and applications of organotin(<sc>iv</sc>) catalysts.
This review focuses on the photocatalytic conversion of biomass, emphasizing several types systems, including different photocatalysts and biomass derivatives.
ABSTRACT Estolides are fatty acid oligomers that can be employed in the formulation of lubricants as an environmentally friendly alternative to mineral and synthetic oils. These bio‐based esters often exhibit improvements essential lubricant properties (oxidative stability, cold flow properties, viscosity index [VI], etc.) with respect unmodified vegetable In this study, we evaluate a potential new series renewable high on basis mixtures acylglycerol‐estolides obtained from simultaneous...
Abstract Several classical catalytic systems for the transesterification reaction have been used to produce FA ethyl esters (FAEE) from castor and cottonseed oils The effects of amount nature catalyst, temperature, on yields FAEE were determined. most efficient oil was achieved in presence methoxide acid catalysts, whereas oil, which has a composition that is much more similar vegetable than highest obtained following base‐catalysed ethanolysis.
Because of their high viscosity and density, crude fats oils extracted from animal or vegetable sources (containing mainly triglycerides) cannot be directly combusted in modern diesel engines; therefore, they must converted into biofuels. This important transformation is currently a technological bottleneck for the generation biofuels either by thermocatalytic cracking to produce diesel-like hydrocarbons alcoholysis yield mono-alcohol fatty acid esters (biodiesel). Although both...
Biodiesel was produced by ethanolysis of pure castor and soybean oils, mixtures thereof, using potassium hydroxide as catalyst. The yields selectivities these reactions were evaluated. results revealed that there no appreciable substrate preference when the vegetable oils transesterified in admixture. However, higher reaction increased efficiencies purification process directly correlated with proportion oil present mixture.
Gold nanorods (AuNRs) are suitable for constructing self-assembled structures the development of biosensing devices and usually obtained in presence cetyltrimethylammonium bromide (CTAB). Here, a sulfated chitosan (ChiS) gum arabic (GA) were employed to encapsulate CTAB/AuNRs with purpose studying interactions polysaccharides CTAB, which is cytotoxic responsible instability nanoparticles buffer solutions. The variety functional groups such as sulfate ChiS carboxylic GA, led efficient...
The nonlinear optical properties of two ionic liquids, 1-n-butyl-3-methylimidazolium tetrafluoroborate ([BMI]BF4) and hexafluorophosphate ([BMI]PF6), have been investigated using the Z-scan technique. These compounds are liquid at room temperature present a strong nature. Nonlinear refraction absorption, thermo-optical measurements for both liquids were performed different laser wavelengths, 514 nm 810 nm, in continuous wave femtosecond regimes, respectively. It was observed that those...
A simple method to prepare magnesium oxide catalysts for biodiesel production by transesterification reaction of soybean oil with ethanol is proposed. The was developed using a metal–chitosan complex. Compared the commercial oxide, proposed displayed higher surface area and basicity values, leading yield in terms fatty acid ethyl esters (biodiesel). deactivation catalyst due contact CO2 H2O present ambient air verified. It confirmed that active catalytic site hydrogenocarbonate adsorption site.
New aspects of the formation and growth mechanism gold nanorods (AuNRs) during seed-mediated colloidal synthesis are revealed from results molecular dynamics simulation. The model systems consist cetyltrimethylammonium bromide (CTAB) units adsorbed on low-index [Au(110), Au(100), Au(111)] high-index [Au(250)] surfaces. CTAB as adjacent cylindrical micelles when relative number ions is small. At later AuNR stages, increases [AuBr2]- species pass through channels between surface. Thus, mature...
In this study, we designed and synthesized a series of thiophen-2-iminothiazolidine derivatives from thiophen-2-thioureic with good anti-Trypanosoma cruzi activity. Several the final compounds displayed remarkable trypanocidal The ability new to inhibit activity enzyme cruzain, major cysteine protease T. cruzi, was also explored. 3b, 4b, 8b 8c were most active against amastigote form, significant IC50 values between 9.7 6.03 μM. derivative showed highest potency cruzain (IC50 = 2.4 μM)....
Z -scan revealed thermal and electronic contributions for the nonlinear refractive index of highly stable colloid containing different concentrations gold nanoparticles. Large enhancement factors were observed values n2 dn∕dT colloid, due to presence Our results suggest that effects will play an important role in development photonic applications involving nanostructured materials investigation nonlocal phenomena.
Chloroquine (CQ) is a cost effective antimalarial drug with relatively good safety profile (or therapeutic index). However, CQ no longer used alone to treat patients Plasmodium falciparum due the emergence and spread of CQ-resistant strains, also reported for P. vivax. Despite resistance, novel candidates based on structure continue be considered, as in present work. One analog was synthesized monoquinoline (MAQ) compared previously bisquinoline (BAQ), both tested against vitro berghei mice,...