A procedure for extraction of spectroscopic constants from THz spectroscopy and imaging data was introduced and presented in the case of foamed polymers.
COBISS.SI-ID: 27587623
Structural analysis of polymer foams for insulation enables manufacturers and research facilities to optimise their products and production processes for applications such as building construction. Therefore, two- and three-dimensional investigation of the macro- and microstructure of these materials is important in order to characterize their physical and mechanical properties. In this paper, we present terahertz time-domain spectroscopy and pulsed imaging method to analyse the macroscopic structure of foamed polymers including analysis of voids, inclusions and bead distribution. By measuring the difference between the terahertz waveforms and by calculating the spectroscopic constants we analyse certain material characteristics such as foam density and infrared radiation absorption. Furthermore, we demonstrate that terahertz techniques have several advantages over other technologies, in particular as a non-ionizing alternative to X-ray tomography, and a complementary imaging method to optical or electron microscopy enabling chemical and structural characterization of foamed polymers.
COBISS.SI-ID: 26612263
In last two decades, rapid development in the field of terahertz (THz) technology has opened new possibilities for creating innovative imaging and sensing systems. Although the applications of THz technology in different sectors constantly increase, the construction industry lags behind them. The aim of this article is to review the current applications of THz spectroscopy in research and industry related to construction and building materials, along with the key drawbacks of technology and recommendations for future use. It was demonstrated that THz spectroscopy and imaging have promising potential and provide many opportunities for applications in construction and building materials characterization.
COBISS.SI-ID: 28098599
The structural and thermodynamic phase behavior of the thermotropic liquid crystal dodecylcyanobiphenyl (12CB) confined in controlled-pore glasses (CPGs) has been studied by means of high-resolution calorimetry and small-angle X-ray scattering. Non-treated CPG matrices have been used with a characteristic pore size R ranging from nanometre to micrometre scale. Even in the case of the strongest confinement the isotropic-to-smectic-A (I-SmA) transition was pronounced. The observed behavior is explained using scaling and dimensional analysis within the Landau-Ginzburg-de Gennes mesoscopic approach. This paper is partially related to the project, because these type of liquid crystalline samples represent a useful model system for testing the THz imaging techniques.
COBISS.SI-ID: 25534759
This contribution presented examples of measurement results with THz system and potential industrial applications
COBISS.SI-ID: 25817127