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Influence of the H2O content and the time on the formation of nanostructures in a chemical solution of H2O/HF/NH4F/EG

Raba, Angela; Bautista-Ruiz, Jorge; Rincón Joya, Miryam (Journal of Physics: Conference Series, 2018-12-07)

The influence of anodizing time on the length, morphology and photoelectrochem-ical properties of TiO2 Nanotubes has been investigated. An optimum anodizing time of 20 min at 20V leads to 220nm long of the nanotubes. By ...
Quicklime as an alternative in the photodegradation of contaminants

Raba, Angela; Bautista-Ruiz, Jorge; Rincón Joya, Miryam (Journal of Physics: Conference SeriesBogota ,Colombia, 2016-02-12)

Chemical oxidation is one of the many different methods of removing contaminants that has emerged recently, is an alternative method to traditional techniques. According to this research calcium peroxide is suitable choice ...
Synthesis and Structural Properties of Niobium Pentoxide Powders: A Comparative Study of the Growth Process

Raba, Angela; Rincón Joya, Miryam; Bautista-Ruiz, Jorge (Materials ResearchBrasilia , Brasil, 2016-10-10)

Powders Nb2 O5 were prepared by two different synthesis method, Sol-Gel and polymeric precursors (Pechini). In the Pechini method before adding the citric acid in the process, four different solutions were used to get the ...

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Influence of the H2O content and the time on the formation of nanostructures in a chemical solution of H2O/HF/NH4F/EG
...
Raba, Angela | 2018-12-07

The influence of anodizing time on the length, morphology and photoelectrochem-ical properties of TiO2 Nanotubes has been investigated. An optimum anodizing time of 20 min at 20V leads to 220nm long of the nanotubes. By having a detailed control of the electric current one can know exactly the time in which the nanotubes grew and the time in which the process stopped. The FEG-SEM measures show the morphology of the nanotubes and how they come to separate and fall after a certain time. However, the growth of these, is uniform with little remaining material on the surface. For the solution of the anodizing process it is very important to control the amount of water, ethylene glycol and hydrofluoric acid. Small modifications in the solution change the growth time and size of the nanotubes.

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Quicklime as an alternative in the photodegradation of contaminants
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Raba, Angela | 2016-02-12

Chemical oxidation is one of the many different methods of removing contaminants that has emerged recently, is an alternative method to traditional techniques. According to this research calcium peroxide is suitable choice for contaminant biodegradation in soil and ground water, but it happens at a very low speed. We hope that the method of synthesis of calcium peroxide in nano size by increased ratio of surface to volume can increase the speed of reaction and solve the problem. In the first synthesis of the material we obtained CaO instead of CaO2. Calcium oxide (CaO), commonly known as quicklime or burnt lime, is a widely used chemical compound in obtaining hypochlorite and to neutralize acidic soils. In this study we characterize the material by X-ray scanning electron microscopy, and ultraviolet-visible spectroscopy.

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Synthesis and Structural Properties of Niobium Pentoxide Powders: A Comparative Study of the Growth Process
...
Raba, Angela | 2016-10-10

Powders Nb2 O5 were prepared by two different synthesis method, Sol-Gel and polymeric precursors (Pechini). In the Pechini method before adding the citric acid in the process, four different solutions were used to get the samples. For Sol-gel method, two different processes were also used in obtaining powders. The precursor was completely solubilized in ethanol and then hydrolyzed with ammonia and water. The calcination of the samples was between 500 and 750°C. The resulting powders were characterized by Scanning Electron Microscopy (SEM), Brunauer, Emmett and Teller (BET) surface area measurements, UV-visible and Raman spectroscopy. The formation of T−Nb2 O5 orthorhombic took place upon calcination at 7500C. Crystallite sizes were determined using the Scherrer method which resulted in an uniformed size of about 25 − 65nm. Ultraviolet-Visible diffuse reflectance spectroscopy indicated a variation in the optical band gap values (3.32-3.40 eV) in crystal growth process. The Raman vibrational modes indicate the presence of the orthorhombic phase of the material.

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Listar Materiales Poliméricos - GIMAPOL por autor "d2ad76c1874f15a36c3360ca84fbcb66"

Influence of the H2O content and the time on the formation of nanostructures in a chemical solution of H2O/HF/NH4F/EG

Quicklime as an alternative in the photodegradation of contaminants

Synthesis and Structural Properties of Niobium Pentoxide Powders: A Comparative Study of the Growth Process

Envíos recientes

Influence of the H2O content and the time on the formation of nanostructures in a chemical solution of H2O/HF/NH4F/EG

Quicklime as an alternative in the photodegradation of contaminants

Synthesis and Structural Properties of Niobium Pentoxide Powders: A Comparative Study of the Growth Process

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Listar Materiales Poliméricos - GIMAPOL por autor "d2ad76c1874f15a36c3360ca84fbcb66"

Influence of the H2O content and the time on the formation of nanostructures in a chemical solution of H2O/HF/NH4F/EG ﻿

Quicklime as an alternative in the photodegradation of contaminants ﻿

Synthesis and Structural Properties of Niobium Pentoxide Powders: A Comparative Study of the Growth Process ﻿

Envíos recientes

Influence of the H2O content and the time on the formation of nanostructures in a chemical solution of H2O/HF/NH4F/EG

Quicklime as an alternative in the photodegradation of contaminants

Synthesis and Structural Properties of Niobium Pentoxide Powders: A Comparative Study of the Growth Process

Portales Institucionales

Influence of the H2O content and the time on the formation of nanostructures in a chemical solution of H2O/HF/NH4F/EG

Quicklime as an alternative in the photodegradation of contaminants

Synthesis and Structural Properties of Niobium Pentoxide Powders: A Comparative Study of the Growth Process