Solution Chemistry
Mostrando 1-12 de 163 artigos, teses e dissertações.
-
1. INTERDISCIPLINARY EDUCATION THROUGH THE DEVELOPMENT OF A COST-EFFECTIVE PHOTOMETRIC PH METER SENSOR USING NATURAL PIGMENTS
There is a trend of development of analytical methodologies and technologies that allow in situ analysis, producing accurate information in real time, at low cost, using homemade experiments and devices to increase interest in scientific knowledge with a constructive approach in an interdisciplinary perspective in Chemistry Education. In this context, a phot
Química Nova. Publicado em: 2022
-
2. NMR Relaxometry Applied to Chemical Studies of Paramagnetic Metal Cation Complexes: Fundamentals and Applications
Low field time-domain nuclear magnetic resonance (TD-NMR) relaxometry of paramagnetic metal cations (PMC) has been widely used to study and improve contrast agents for magnetic resonance imaging (MRI). However, despite its remarkable potential, TD-NMR is rarely used to study PMC complexes, and coordination compounds in non-biomedical application. Therefore,
Journal of the Brazilian Chemical Society. Publicado em: 2022
-
3. EVOLUÇÃO DIRIGIDA DE ENZIMAS: PEQUENAS MODIFICAÇÕES, MELHORES BIOCATALISADORES
Biocatalysis is now a mature field, both in the laboratory and industrial scale. This approach counts on enzyme high selectivity, biodegradability, elegant control over the outcome of reaction conditions and as a possible solution to address some challenges in Green Chemistry faced by synthetic organic chemists. However, many wild-type ready-to-use enzymes w
Quím. Nova. Publicado em: 2020-06
-
4. Extratos de Lilium sp., Agapanthus sp. e Hydrangea sp.: comportamento como indicadores naturais em diferentes faixas de pH
This experimental activity proposes the use of lily (Lilium sp.), agapanthus (Agapanthus sp.) and hydrangea (Hydrangea sp.) extracts to investigate the colorimetric profile of each extract between pH 1-14. Water, ethanol and ethanol/HCl 1% (w/w) were used as extractive solvents. Among the flowers tested, the extracts of orange lily and burnt yellow lily were
Quím. Nova. Publicado em: 2020-02
-
5. Effect of Etching Temperature on Surface Properties of Ti6Al4V Alloy for Use in Biomedical Applications
The objective of this study is to evaluate the surface physicochemical properties of Ti6Al4V alloy after etching with a piranha’s solution at temperatures of 25 °C, 40 °C, and 60 °C for 30 min. Scanning electron microscopy with energy-dispersive X-ray spectroscopy, optical profilometry, X-ray diffraction, and wettability analyses were used to characteri
Mat. Res.. Publicado em: 10/01/2020
-
6. Hydrogen production from aqueous glycerol using titanate nanotubes decorated with Au nanoparticles as photocatalysts
Abstract: Protonated titanate nanotubes (HTiNts) were synthesized using the hydrothermal method, followed by proton exchange with acid. Gold nanoparticles decorated titanate nanotubes (AuHTiNts) were obtained by the reduction of AuCl4- under vigorous stirring with an aqueous solution of HTiNts containing 1 wt% of ascorbic acid. To investigate the surface str
An. Acad. Bras. Ciênc.. Publicado em: 28/11/2019
-
7. Vibrational Spectroscopy and Chemometrics in Forensic Chemistry: Critical Review, Current Trends and Challenges
The present manuscript makes an extensive review of the scientific approaches developed in the last decade involving infrared and Raman spectroscopy combined with chemometrics for solving several issues in the investigation of the most relevant forensic traces, such as questioned documents and currency, explosives, gunshot residues, illicit drugs and body fl
J. Braz. Chem. Soc.. Publicado em: 24/10/2019
-
8. 1H NMR STUDY OF THE HOST-GUEST CHEMISTRY IN A SUPRAMOLECULAR HELICATE FEII 2L3 SOLUTION
A novel [FeII2L3]4+ metallo-organic helicate results from subcomponent self-assembly of a C3-symmetric triamine (4,4',4''- (1,3,5-triazine-2,4,6-triyl) trianiline), octahedral iron(II) and 2-formyl pyridine in CH3CN solution. The constitution of this supramolecular helicate was confirmed by ESI-MS and 1H NMR spectra. Different planar aromatic guests were sel
Quím. Nova. Publicado em: 27/05/2019
-
9. AUTORIA COLETIVA EM AMBIENTE INFORMATIZADO NO ENSINO SUPERIOR DE QUÍMICA
Collective authorship or a text written by more than one person in a computer-based environment can bring significant benefits to chemistry teaching, mainly concerning flexibilizing forms of interaction among those involved and collaborative construction of knowledge. This work investigates collective authorship activities based on constructing argumentative
Quím. Nova. Publicado em: 27/05/2019
-
10. Evaluation of Techniques for Determination of Hydroxyl Value in Materials for Different Industrial Applications
ABSTRACT When some materials need to be characterized, the hydroxyl number (IOH) determination is especially useful, mainly for those applied in the aerospace field. Usually, this characterization is performed by wet chemistry, using methodologies involving several steps, such as derivatization. This is a time-consuming and costly step. On the other hand, wh
J. Aerosp. Technol. Manag.. Publicado em: 04/04/2019
-
11. Effectiveness of a rapid soil incubation method for determining potential acidity of soils in Rio Grande do Sul, Brazil
RESUMO: A acidez potencial do solo pode ser medida por dois métodos nos estados do Rio Grande do Sul (RS) e Santa Catarina (SC): índice SMP ou solução TSM (Tampão Santa Maria). A calibração destes métodos é feita pela incubação de solos por longos períodos (180 dias) com quantidades crescentes de CaCO3. A hipótese deste estudo é que é possíve
Cienc. Rural. Publicado em: 11/02/2019
-
12. Generación de mesoporosidad en zeolitas ZSM-11, BETA e Y por tratamiento alcalino
ABSTRACT Zeolites, Y, ZSM-11 and BETA, widely used in refineries and petrochemical processes, fine chemistry and environmental processes were subjected to an alkaline treatment of desilication, in order to generate mesoporosity in the structure. The process used consisted of treating samples with an aqueous solution of NaOH at 65 ° C for 30 minutes. An exch
Matéria (Rio J.). Publicado em: 19/07/2018