Influence of OH<sup>−</sup>Ion Concentration on the Surface Morphology of ZnO-SiO<sub>2</sub>Nanostructure

Tinio, Jessica Ven G.; Simfroso, Key; Peguit, Amber Dea Marie V.; Candidato, Rolando T.

doi:10.1155/2015/686021

Cited by 23 publications

(11 citation statements)

References 21 publications

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“…In addition, diffraction patterns have two peaks at 25° and 45°, possibly attributed to the characteristics of reduced graphite oxide (rGO) . Furthermore, the broadband at 25° was associated with the amorphous phase of SiO 2 , as reported by Ven et al, as expected in this work.…”

Section: Resultssupporting

confidence: 86%

Activated Carbon Obtained from Bamboo: Synthesis, Morphological, Vibrational, and Electrical Properties and Possible Temperature Sensor

Arias‐Niquepa

Prías‐Barragán

Calderón

et al. 2019

Physica Status Solidi (a)

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In order to develop a new temperature sensor based on activated carbon (AC) samples, this work presents the synthesis, basic properties, and temperature sensor characteristics as possible future application. The AC samples are obtained from bamboo as source material via thermal decomposition method, under a controlled nitrogen low-atmosphere, at different carbonization temperatures and activated by using NaOH at 973 K. The basic properties are studied by using SEM, EDS, BET, X-ray diffraction, FTIR, Raman, and electrical techniques. It is found that AC exhibits morphological behavior of particles with vascular characteristics. The structural and vibrational responses suggest graphite oxide domains present in AC. Electrical characterization revealed a two-order of magnitude increase in conductivity, possibly attributed to increased graphite oxide domains produced by desorption of some organic compounds, which benefits development of temperature sensors with negative temperature coefficient (NTC). A possible temperature sensor based on AC is proposed and implemented. The electrical resistivity of AC, as temperature sensor, exhibits a NTC at À4.7%/K, with linear current response varying from 21.1 to 37.2 mA, which is a novelty for a thermistor NTC. These results suggest that AC is an excellent candidate to develop temperature sensors in electronics.

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Section: Resultssupporting

confidence: 86%

Activated Carbon Obtained from Bamboo: Synthesis, Morphological, Vibrational, and Electrical Properties and Possible Temperature Sensor

Arias‐Niquepa

Prías‐Barragán

Calderón

et al. 2019

Physica Status Solidi (a)

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“…In general, the absence of peaks of likely impurities such as sodium sulfate and other salts or www.nature.com/scientificreports/ metals confirms the purity of recovered products 42,43 . The peak between 17° and 30° recorded in the precipitate from pH 10 to pH 6 indicates amorphous silica according to Liu et al and Tinio et al 44,45 . Together with the featureless diffractograms, the appearance of a diffuse maximum at 22.5° indicates the amorphous nature of silica existing in the recovered precipitates in this range of pH 46,47 .…”

Section: Clarification Of Chemical Structure Ft-ir Analysismentioning

confidence: 83%

The novel method to reduce the silica content in lignin recovered from black liquor originating from rice straw

Nghị

Pham

et al. 2020

Sci Rep

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Difficulties in the production of lignin from rice straw because of high silica content in the recovered lignin reduce its recovery yield and applications as bio-fuel and aromatic chemicals. Therefore, the objective of this study is to develop a novel method to reduce the silica content in lignin from rice straw more effectively and selectively. The method is established by monitoring the precipitation behavior as well as the chemical structure of precipitate by single-stage acidification at different pH values of black liquor collected from the alkaline treatment of rice straw. The result illustrates the significant influence of pH on the physical and chemical properties of the precipitate and the supernatant. The simple two-step acidification of the black liquor at pilot-scale by sulfuric acid 20w/v% is applied to recover lignin at pH 9 and pH 3 and gives a percentage of silica removal as high as 94.38%. Following the developed process, the high-quality lignin could be produced from abundant rice straw at the industrial-scale.

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“…The X-ray diffraction (XRD) measurements are presented in Figure 1 . An analysis of the results shows that the sample SiO 2 -Ag has a characteristic peak of amorphous SiO 2 at around 2 θ = 22.2° [ 78 , 79 , 80 , 81 ]. No additional peak is observed regarding possible Ag phases.…”

Section: Resultsmentioning

confidence: 99%

SiO2-Ag Composite as a Highly Virucidal Material: A Roadmap that Rapidly Eliminates SARS-CoV-2

et al. 2021

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COVID-19, as the cause of a global pandemic, has resulted in lockdowns all over the world since early 2020. Both theoretical and experimental efforts are being made to find an effective treatment to suppress the virus, constituting the forefront of current global safety concerns and a significant burden on global economies. The development of innovative materials able to prevent the transmission, spread, and entry of COVID-19 pathogens into the human body is currently in the spotlight. The synthesis of these materials is, therefore, gaining momentum, as methods providing nontoxic and environmentally friendly procedures are in high demand. Here, a highly virucidal material constructed from SiO2-Ag composite immobilized in a polymeric matrix (ethyl vinyl acetate) is presented. The experimental results indicated that the as-fabricated samples exhibited high antibacterial activity towards Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) as well as towards SARS-CoV-2. Based on the present results and radical scavenger experiments, we propose a possible mechanism to explain the enhancement of the biocidal activity. In the presence of O2 and H2O, the plasmon-assisted surface mechanism is the major reaction channel generating reactive oxygen species (ROS). We believe that the present strategy based on the plasmonic effect would be a significant contribution to the design and preparation of efficient biocidal materials. This fundamental research is a precedent for the design and application of adequate technology to the next-generation of antiviral surfaces to combat SARS-CoV-2.

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Influence of OH⁻Ion Concentration on the Surface Morphology of ZnO-SiO₂Nanostructure

Cited by 23 publications

References 21 publications

Activated Carbon Obtained from Bamboo: Synthesis, Morphological, Vibrational, and Electrical Properties and Possible Temperature Sensor

Activated Carbon Obtained from Bamboo: Synthesis, Morphological, Vibrational, and Electrical Properties and Possible Temperature Sensor

The novel method to reduce the silica content in lignin recovered from black liquor originating from rice straw

SiO2-Ag Composite as a Highly Virucidal Material: A Roadmap that Rapidly Eliminates SARS-CoV-2

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Influence of OH−Ion Concentration on the Surface Morphology of ZnO-SiO2Nanostructure

Cited by 23 publications

References 21 publications

Activated Carbon Obtained from Bamboo: Synthesis, Morphological, Vibrational, and Electrical Properties and Possible Temperature Sensor

Activated Carbon Obtained from Bamboo: Synthesis, Morphological, Vibrational, and Electrical Properties and Possible Temperature Sensor

The novel method to reduce the silica content in lignin recovered from black liquor originating from rice straw

SiO2-Ag Composite as a Highly Virucidal Material: A Roadmap that Rapidly Eliminates SARS-CoV-2

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Influence of OH⁻Ion Concentration on the Surface Morphology of ZnO-SiO₂Nanostructure