A Comparative Study of Structural Stability and Mechanical and Optical Properties of Fluorapatite (Ca5(PO4)3F) and Lithium Disilicate (Li2Si2O5) Components Forming Dental Glass–Ceramics: First Principles Study

Biskri, Zine Elabidine; Rached, H.; Bouchear, M.; Rached, D.; Aida, M.S.

doi:10.1007/s11664-016-4681-4

Cited by 36 publications

(26 citation statements)

References 40 publications

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“…From the quantum-mechanics (i.e., microscopic) viewpoint, the optical dielectric loss is strongly correlated to the occupied and unoccupied electronic states within a solid. Furthermore, it is microscopically confirmed that the primary peak in the imaginary part of dielectric function is in strong correspondence with the interband transitions [26,27]. The results of the current work (shown in Figure 6) reveal that the calculated optical dielectric loss ( = 2 ) against the photon energy can be used to study the optical band gap.…”

Section: ]supporting

confidence: 67%

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New Method for the Development of Plasmonic Metal-Semiconductor Interface Layer: Polymer Composites with Reduced Energy Band Gap

Aziz

Mamand

Saed

et al. 2017

Journal of Nanomaterials

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Silver nanoparticles within a host polymer of chitosan were synthesized by using in situ method. Ultraviolet-visible spectroscopy was then carried out for the prepared chitosan : silver triflate (CS : AgTf) samples, showing a surface plasmonic resonance (SPR) peak at 420 nm. To prepare polymer composites with reduced energy band gap, different amounts of alumina nanoparticles were incorporated into the CS : AgTf solution. In the present work, the results showed that the reduced silver nanoparticles and their adsorption on wide band gap alumina (Al 2 O 3 ) particles are an excellent approach for the preparation of polymer composites with small optical band gaps. The optical dielectric loss parameter has been used to determine the band gap experimentally. The physics behind the optical dielectric loss were interpreted from the viewpoint of quantum mechanics. From the quantum-mechanics viewpoint, optical dielectric loss was also found to be a complex equation and required lengthy numerical computation. From the TEM investigation, the adsorption of silver nanoparticles on alumina has been observed. The optical micrograph images showed white spots (silver specks) with different sizes on the surface of the films. The second semicircle in impedance Cole-Cole plots was found and attributed to the silver particles.

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Section: ]supporting

confidence: 67%

“…The imaginary part of the dielectric function mainly identifies the electronic transition from an occupied state to an empty state [26]. The correlation between optical dielectric loss and band structure can be realized from the following equation [27]:…”

Section: ]mentioning

confidence: 99%

New Method for the Development of Plasmonic Metal-Semiconductor Interface Layer: Polymer Composites with Reduced Energy Band Gap

Aziz

Mamand

Saed

et al. 2017

Journal of Nanomaterials

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“…It is also stated from quantum mechanics (microscopic) that a strong relationship between the electronic states and the optical loss parameter exists depending on whether they are filled and unfilled in solids. As previously mentioned there is also a correlation between the imaginary part of the dielectric function and interband transitions that has been confirmed from quantum mechanics [ 285 , 288 , 295 ]. Additionally, it is of great importance to take advantage of optically induced transition and band structure of materials from analysis of optical absorption process [ 297 ].…”

Section: Optical Parametersmentioning

confidence: 64%

“…The theoretical principle of optical dielectric constant is based on a complex function of frequency. Thus, large-scale computational endeavor is needed to calculate dielectric constants [ 288 , 289 , 290 , 291 ]. On the other hand, experimental estimation of dielectric constant from the optical dielectric function on imaginary part ( ε 2 ) is easily achieved using refractive index and extinction coefficient in the calculation as shown in the following relationship [ 78 , 281 , 282 , 283 , 284 , 285 , 286 ]:

where K and n are the extinction coefficient and refractive index, respectively.…”

Section: Optical Parametersmentioning

confidence: 99%

A Comprehensive Review on Optical Properties of Polymer Electrolytes and Composites

et al. 2020

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Polymer electrolytes and composites have prevailed in the high performance and mobile marketplace during recent years. Polymer-based solid electrolytes possess the benefits of low flammability, excellent flexibility, good thermal stability, as well as higher safety. Several researchers have paid attention to the optical properties of polymer electrolytes and their composites. In the present review paper, first, the characteristics, fundamentals, advantages and principles of various types of polymer electrolytes were discussed. Afterward, the characteristics and performance of various polymer hosts on the basis of specific essential and newly published works were described. New developments in various approaches to investigate the optical properties of polymer electrolytes were emphasized. The last part of the review devoted to the optical band gap study using two methods: Tauc’s model and optical dielectric loss parameter. Based on recently published literature sufficient quantum mechanical backgrounds were provided to support the applicability of the optical dielectric loss parameter for the band gap study. In this review paper, it was demonstrated that both Tauc’s model and optical dielectric loss should be studied to specify the type of electron transition and estimate the optical band gap accurately. Other parameters such as absorption coefficient, refractive index and optical dielectric constant were also explored.

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“…Such an increase is related to the increment of the density of states since ε 1 can be directly associated with the density of states inside the forbidden gap of the solid polymer films [43]. Previous studies established that ε 1 is related to the electronic part and depends strongly on the optical bandgap [28,44]. This can be better understood from the well-known Penn model [45], as given by:

ε_{1} false(0 false) \approx 1 + {(ℏ ω_{p} / E_{g})}^{2}

…”

Section: Resultsmentioning

confidence: 99%

Morphological and Optical Characteristics of Chitosan(1−x):Cuox (4 ≤ x ≤ 12) Based Polymer Nano-Composites: Optical Dielectric Loss as an Alternative Method for Tauc’s Model

Aziz

2017

Nanomaterials

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In this work, copper (Cu) nanoparticles with observable surface plasmonic resonance (SPR) peaks were synthesized by an in-situ method. Chitosan host polymer was used as a reduction medium and a capping agent for the Cu nanoparticles. The surface morphology of the samples was investigated through the use of scanning electron micrograph (SEM) technique. Copper nanoparticles appeared as chains and white specks in the SEM images. The strong peaks due to the Cu element observed in the spectrum of energy dispersive analysis of X-rays. For the nanocomposite samples, obvious peaks due to the SPR phenomena were obtained in the Ultraviolet-visible (UV-vis) spectra. The effect of Cu nanoparticles on the host band gap was understood from absorption edges shifting of absorption edges to lower photon energy. The optical dielectric loss parameter obtained from the measurable quantities was used as an alternative method to study the band structure of the samples. Quantum mechanical models drawbacks, in the study of band gap, were explained based on the optical dielectric loss. A clear dispersion region was able to be observed in refractive indices spectra of the composite samples. A linear relationship with a regression value of 0.99 was achieved between the refractive index and volume fractions of CuI content. Cu nanoparticles with various sizes and homogenous dispersions were also determined from transmission electron microscope (TEM) images.

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A Comparative Study of Structural Stability and Mechanical and Optical Properties of Fluorapatite (Ca5(PO4)3F) and Lithium Disilicate (Li2Si2O5) Components Forming Dental Glass–Ceramics: First Principles Study

Cited by 36 publications

References 40 publications

New Method for the Development of Plasmonic Metal-Semiconductor Interface Layer: Polymer Composites with Reduced Energy Band Gap

New Method for the Development of Plasmonic Metal-Semiconductor Interface Layer: Polymer Composites with Reduced Energy Band Gap

A Comprehensive Review on Optical Properties of Polymer Electrolytes and Composites

Morphological and Optical Characteristics of Chitosan(1−x):Cuox (4 ≤ x ≤ 12) Based Polymer Nano-Composites: Optical Dielectric Loss as an Alternative Method for Tauc’s Model

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