Qualitative and quantitative analysis of calcium-based microfillers using terahertz spectroscopy and imaging

Abina, Andreja; Puc, Uroš; Jeglic, A.; Prah, Jana; Venckevičius, Rimvydas; Kašalynas, Irmantas; Valušis, Gintaras; Zidanšek, Aleksander

doi:10.1016/j.talanta.2015.05.027

Cited by 14 publications

(11 citation statements)

References 35 publications

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“…The research and practical applications such as THz spectroscopy and THz imaging in laboratories worldwide performed by organic NLO crystals are still more exceptional in comparison with competitive THz systems based on photoconductive antennas or inorganic NLO crystals that are more common, also because photoconductive antennas and inorganic NLO crystals are much more widely available. Nevertheless, the use of organic crystalline THz sources in fundamental science and development is moving to other interdisciplinary fields [174][175][176][177][178][179], which indicates a great potential for the future transfer of organic-crystal based THz spectroscopic and imaging systems into industrial applications. According to the THz science and technology roadmap prepared by Dhillon et al [1], one can expect that organic THz sources will enter other fields of applications similarly as THz systems based on photoconductive antennas or inorganic NLO crystals.…”

Section: Applications Of Organic Thz Sourcesmentioning

confidence: 99%

“…Its usefulness and effectiveness in manufacturing processes are defined by several physicochemical properties such as granulation, particle size distribution, hardness, morphology, specific surface area, polymorphism and chemical purity. One of the most abundant raw material calcium carbonate (CaCO 3 ) was characterized by THz spectroscopic and imaging system operating with organic NLO crystals (see Figure 15) [174]. Several parameters such as CaCO 3 concentration in a polymer matrix, its granulation, and chemical treatment were analyzed based on the analysis of peak absorbance amplitude at around 3.2 THz, the appearance of additional spectral features such as shoulder and small peaks on the first derivative of absorbance spectra, and the frequency position and shift.…”

Section: Pharmaceutical and Chemical Industrymentioning

confidence: 99%

“…The results of this study demonstrated that the THz system based on DSTMS crystals has great potential as a rapid analytical tool for qualitative and quantitative analysis of powdered materials. [174]. Reprinted from Ref.…”

Section: Pharmaceutical and Chemical Industrymentioning

confidence: 99%

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Organic Crystals for THz Photonics

et al. 2019

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Organic crystals with second-order optical nonlinearity feature very high and ultra-fast optical nonlinearities and are therefore attractive for various photonics applications. During the last decade, they have been found particularly attractive for terahertz (THz) photonics. This is mainly due to the very intense and ultra-broadband THz-wave generation possible with these crystals. We review recent progress and challenges in the development of organic crystalline materials for THz-wave generation and detection applications. We discuss their structure, intrinsic properties, and advantages compared to inorganic alternatives. The characteristic properties of the most widely employed organic crystals at present, such as DAST, DSTMS, OH1, HMQ-TMS, and BNA are analyzed and compared. We summarize the most important principles for THz-wave generation and detection, as well as organic THz-system configurations based on either difference-frequency generation or optical rectification. In addition, we give state-of-the-art examples of very intense and ultra-broadband THz systems that rely on organic crystals. Finally, we present some recent breakthrough demonstrations in nonlinear THz photonics enabled by very intense organic crystalline THz sources, as well as examples of THz spectroscopy and THz imaging using organic crystals as THz sources for various scientific and technological applications.

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Section: Applications Of Organic Thz Sourcesmentioning

confidence: 99%

Section: Pharmaceutical and Chemical Industrymentioning

confidence: 99%

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Organic Crystals for THz Photonics

et al. 2019

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“…Some attempts to use waste powders as additives or microfillers in cement/concrete production are presented in literature [2,3]. As far as the authors of this paper know, there is no publications regarding the use of this type of by-product as a microfiller in polymer composites; however, the use of specially produced limestone powder in these types of composites is known from previous research [4]. The aim of this paper is to discuss the potential of using this by-product as a microfiller in the polymer concrete industry.…”

Section: Introductionmentioning

confidence: 98%

Chemical and Physical Properties of Limestone Powder as a Potential Microfiller of Polymer Composites

Kępniak

Woyciechowski

Franus

2017

Archives of Civil Engineering

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The preliminary stage of asphalt mixture production involves the drying and dedusting of coarse aggregates. The most common types of coarse aggregates used are limestone and basalt. In the process of drying and dedusting the dryer filter accumulates large quantities of waste in the form of mineral powder. This paper introduces an investigation into limestone powder waste as a potential microfiller of polymer composites. Physical characteristics such as the granulation the of powder collected from the filter -in terms of the season of its collection and the type of input materials used -were analysed. A scanning electron microscope (SEM) was used for the investigation described within this paper. The obtained results were compared against those of other materials which can be used as polymer composites microfillers.

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“…The type of polymorph is important: it has been shown that aragonite has lower intrinsic losses than calcite . Also, calcium carbonate exhibits a characteristic absorption peak at about 3.3 THz . Titanium dioxide features a high real permittivity, which may lead in particular to a shortening of the antennas size…”

Section: Origins Of Dielectric Losses Of Paper In the Thz Domainmentioning

confidence: 99%

Dielectric Losses of Paper in the THz Domain: Literature Review, Needs for Future Research, and Prospective Solutions

Huber

Martinez

Guers

et al. 2017

Physica Status Solidi (a)

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High frequency paper‐based electronics is developing fast, with smart yet low cost applications in view. However, the dielectric losses of paper remain a difficult hurdle to overcome. First, the literature on the topic is reviewed and the contributions from moisture, air, mineral filler, and wood constituents to dielectric losses are highlighted. Then, the guidelines for future research are defined, including the need for systematic comparisons in controlled moisture conditions. In an effort to produce low loss materials for paper‐based electronics, it is proposed here to impregnate paper with a low loss substance, after removing residual water.

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Qualitative and quantitative analysis of calcium-based microfillers using terahertz spectroscopy and imaging

Cited by 14 publications

References 35 publications

Organic Crystals for THz Photonics

Organic Crystals for THz Photonics

Chemical and Physical Properties of Limestone Powder as a Potential Microfiller of Polymer Composites

Dielectric Losses of Paper in the THz Domain: Literature Review, Needs for Future Research, and Prospective Solutions

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