Application of Terahertz Spectroscopy to Rubber Products: Evaluation of Vulcanization and Silica Macro Dispersion

Industrial applications of terahertz (THz) technology are becoming more widespread. In particular, novel evaluation methods for essential rubber products are being developed. THz absorbance spectra of various rubber polymers and reagents enable visualization of filler dispersions and vulcanization reactions. Here, improved visualization of the vulcanization reaction in thick rubber samples is discussed. Silica macro-dispersion is also analyzed because it is a general filler in automobile tires and has been difficult to evaluate with conventional techniques.

Lipids monitoring in Scenedesmus obliquus based on Terahertz Technology

Background Microalgae are considered as a source of low pollution and renewable fuel due to their ability to synthesize an abundance of lipids. Conventional methods for lipid quantification are time consuming and chemically contaminated. Spectroscopic method combined with mathematical model can be used for qualitative and quantitative analysis of material composition.Terahertz technology provides not only timely and nondestructive testing without chemical pollution, but also information about the functional group vibration mode and structure of the measured components. Therefore,terahertz is proposed for microalgae metabolism detection. Results The aim of this study was to use Terahertz (THz) spectroscopy to observe lipid content in Scenedesmus obliquus (S. obliquus). We collected the THz spectra of S. obliquus which were cultivated under nitrogen stress and THz spectroscopy was used to analyze changes in substance components (lipids, proteins, carbohydrates and β-carotene). Partial least square was used to establish the prediction model of each stress time point. The correlation coefficient of the prediction results of the model was above 0.991, and the root mean square error was less than 0.020. It indicated that THz technology can be used to discriminate S. obliquus cells under different nitrogen stress culture times effectively. The correlation between the THz characteristic peak (9.3 THz) and the total lipid content determined by gravimetry reaches 0.96. The final results were compared with the commonly used spectroscopic methods for lipid observation (Raman spectroscopy). Conclusions The prediction accuracy of model of THz bands is relatively high. It indicated that THz technology can be used to monitor the change of material composition in microalgae under nitrogen stress. THz is more accurate than Raman in total lipid monitoring. For the research of microalgal metabolites, compared with Raman technology, there is more research space for THz technology. THz technology can provide technical supporting for the engineering culture of oil-producing microalgae under environmental control in future.

Enhanced growth of Nd3+:MgGdB5O10 laser crystals with intense multi-wavelength emission characteristics

Higher quality Nd:GMB crystals were obtained using enhanced K2Mo3O10–B2O3 flux. Intense multi-wavelength emissions reveal their potential in THz technology.

APPLICATION OF THERAHERTZ TECHNOLOGIES IN BIOPHOTONICS. Part 2: Spectroscopy and imaging of malignant neoplasms Применение терагерцовых технологий в биофотонике. Часть 2: Спектроскопия и визуализация злокачественных новообразований

The second part of the review work discusses the current state of research in the diagnosis of malignant neoplasms using terahertz (THz) spectroscopy and imaging. Particular attention is paid to potential applications of THz technology in early non-invasive, minimally invasive and intraoperative diagnostics, as well as in histological studies. The nature of the contrast observed between normal and pathological tissues in the THz range is discussed. Finally, the problems of THz technology transfer into a clinical practive are discussed. Во второй части обзорной работы обсуждается современное состояние исследований в области диагностики злокачественных новообразований с помощью терагерцовой (ТГц) спектроскопии и визуализации. Особое внимание уделяется потенциальным приложениям ТГц техники в ранней неинвазивной, малоинвазивной и интраоперационной диагностике, а также в гистологических исследованиях. Обсуждается природа контраста, наблюдаемого между тканями в нормальном состоянии и при наличии патологии в ТГц диапазоне. Наконец, рассматриваются проблемы ТГц техники, препятствующие ее внедрению в клиническую практику.