Special Issue "New Trends in New Material Production and Characterization Using Scanning Techniques"

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Manufacturing Processes and Systems".

Deadline for manuscript submissions: 31 July 2020.

Special Issue Editors

Prof. Petru Negrea
E-Mail Website
Guest Editor
Applied Chemistry and Engineering of Inorganic Compounds and the Environment, Politehnica University of Timisoara, Timisoara, 300006, Romania
Interests: materials characterization; pollutants; SEM; XRD
Dr. Mihaela Ciopec
E-Mail Website
Guest Editor
Applied Chemistry and Engineering of Inorganic Compounds and the Environment, Politehnica University of Timisoara, Timisoara, 300006, Romania
Interests: polymers functionalization; FTIR; SEM

Special Issue Information

Dear Colleagues,

The rapid development of human society over the last hundred years has resulted in a sharp increase in the number and amount of pollutants emitted into the environment, leading to severe imbalances. Simultaneously, an important technological advance has been observed which allows us to recover pollutants and remediate the environment.

Exploitation and conversion of natural resources in raw materials, used by various industries, leads to the apparition of environmental pollution. Broad diversification of industrial products used for improvement of our living conditions is responsible for most pollutant emissions. In this context, it is important to produce suitable materials (adsorbents, catalysts, and so on) to reduce the pollutant amount discharged into the environment. It is vital to properly characterize the produced materials in order to establish a correlation between material structure (microstructure) and its properties. Such a correlation is being established using different scanning characterization techniques: scanning electron microscopy, scanning probe, optical microscopy, and X-Ray diffraction.

Prof. Petru Negrea
Dr. Mihaela Ciopec
Guest Editors

Manuscript Submission Information

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Keywords

  • Specific forefront scanning based techniques
  • Experimental and theoretical approach used in scanning technologies
  • Specific materials and systems of interest
  • Specific applications of interests
  • Microstructure analysis
  • Microanalysis of the adsorbent materials
  • Scanning electron microscopy used for characterization of new materials
  • Size and chemical composition of the pollutant particles
  • SEM usage to highlight the interaction between different pollutant particles, and between pollutant particles and adsorbent materials
  • Interaction between different pollutants particles and any other relevant aspects for SEM, scanning probe, optical microscopy, etc.
  • Particle distribution and uncertainty

Published Papers (3 papers)

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Research

Open AccessArticle
Modified Chitosan for Silver Recovery—Kinetics, Thermodynamic, and Equilibrium Studies
Materials 2020, 13(3), 657; https://doi.org/10.3390/ma13030657 - 01 Feb 2020
Abstract
The aim of this study is to investigate the silver recovery from aqueous solutions. There are a variety of recovery methods, such as hydrometallurgical, bio-metallurgical, cementation, reduction, electrocoagulation, electrodialysis, ion exchange, etc. Adsorption represents a convenient, environment friendly procedure, that can be used [...] Read more.
The aim of this study is to investigate the silver recovery from aqueous solutions. There are a variety of recovery methods, such as hydrometallurgical, bio-metallurgical, cementation, reduction, electrocoagulation, electrodialysis, ion exchange, etc. Adsorption represents a convenient, environment friendly procedure, that can be used to recover silver from aqueous solutions. In this paper we highlight the silver adsorption mechanism on chitosan chemically modified with active groups, through kinetic, thermodynamic, and equilibrium studies. A maximum adsorption capacity of 103.6 mg Ag(I)/g of adsorbent for an initial concentration of 700 mg/L was noticed by using modified chitosan. Lower adsorption capacity has been noticed in unmodified chitosan—a maximum of 75.43 mg Ag(I)/g. Optimum contact time was 120 min and the process had a maximum efficiency when conducted at pH higher than 6. At the same time, a way is presented to obtain metallic silver from the adsorbent materials used for the recovery of the silver from aqueous solutions. Full article
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Open AccessArticle
Reliability Study of c-Si PV Module Mounted on a Concrete Slab by Thermal Cycling Using Electroluminescence Scanning: Application in Future Solar Roadways
Materials 2020, 13(2), 470; https://doi.org/10.3390/ma13020470 - 19 Jan 2020
Abstract
Several tests were conducted to ratify the reliability and durability of the solar photovoltaic (PV) devices before deployment in the real field (non-ideal conditions). In the real field, the temperature of the PV modules was varied during the day and night. Nowadays, people [...] Read more.
Several tests were conducted to ratify the reliability and durability of the solar photovoltaic (PV) devices before deployment in the real field (non-ideal conditions). In the real field, the temperature of the PV modules was varied during the day and night. Nowadays, people have been bearing in mind the deployment of PV modules on concrete roads to make use of the space accessible on roads. In this regard, a comparative study on the failure and degradation behaviors of crystalline Si PV modules with and without a concrete slab was executed via a thermal cycling stress test. The impact of the concrete slab on the performance degradation of PV modules was evaluated. Electroluminescence (EL) results showed that the defect due to thermal cycling (TC) stress was reduced in the PV module with a concrete slab. The power loss due to the thermal cycling was reduced by approximately 1% using a concrete slab for 200 cycles. The Rsh value was reduced to approximately 91% and 71% after thermal cycling of 200 cycles for reference PV modules, respectively. The value of I0 was increased to approximately 3.1 and 2.9 times the initial value for the PV modules without and with concrete, respectively. Full article
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Open AccessArticle
Performance Degradation Analysis of c-Si PV Modules Mounted on a Concrete Slab under Hot-Humid Conditions Using Electroluminescence Scanning Technique for Potential Utilization in Future Solar Roadways
Materials 2019, 12(24), 4047; https://doi.org/10.3390/ma12244047 - 05 Dec 2019
Cited by 1
Abstract
The stability of the photovoltaic (PV) modules is critical when deployed in a non-ideal environment. Among the different factors, temperature and humidity are the two major factors affecting PV stability, making them significant causes of its degradation in terms of optoelectric and materials [...] Read more.
The stability of the photovoltaic (PV) modules is critical when deployed in a non-ideal environment. Among the different factors, temperature and humidity are the two major factors affecting PV stability, making them significant causes of its degradation in terms of optoelectric and materials properties. Nowadays, with the increase in PV installation (here, we are only taking account of c-Si-based PV modules) to generate green electricity, effective space utilization is an important issue. Recently, people have been considering deploying PV modules on the road to utilize the space available on highways (roadways). This raises several new issues in the deployment of PV modules. However, issues related to temperature and humidity retain the same importance. Normally, these stability tests are performed in a damp-heat (DH) stress-testing chamber in an accelerated condition at 85 °C and 85% relative humidity (RH). In this work, c-Si PV modules were fixed over a concrete slab to prepare a PV interacted block, which can be used to build concrete-based roads. The performance of this PV on the concrete slab was tested in a DH stress-testing chamber in an accelerated condition at 85 °C and 85% RH for 4000 h. For the comparison, a PV module without concrete was also evaluated. The degradation of the PV modules was characterized using the electroluminescence scanning technique. After 2500 h of exposure to the DH conditions, the performance retention of the PV modules mounted on the concrete was 93.2%, which was nearly 5% higher than the module without the concrete slab. Full article
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