Characterization of Hindered Amine Light Stabilizers in Polymer Matrix Using Terahertz Time-Domain Spectroscopy

2012 ◽  
Vol 213 (14) ◽  
pp. 1441-1447 ◽  
Author(s):  
Ling-Hai Xie ◽  
Hao Dai ◽  
Biao-Bing Jin ◽  
Yuan Han ◽  
Qiang Tai ◽  
...  
Keyword(s):  
Polymer Matrix ◽  
Time Domain ◽  
Terahertz Time Domain Spectroscopy ◽  
Time Domain Spectroscopy ◽  
Hindered Amine Light Stabilizers

Terahertz time-domain spectroscopy characterization of nitrocellulose in transmission and reflection configurations

Optik ◽  
2020 ◽  
Vol 224 ◽  
pp. 165711
Author(s):  
Noureddine Maamar ◽  
Mohamed Lazoul ◽  
Feriel Yasmine Latreche ◽  
Djalal Trache ◽  
Jean-Louis Coutaz
Keyword(s):  
Time Domain ◽  
Terahertz Time Domain Spectroscopy ◽  
Time Domain Spectroscopy ◽  
Transmission And Reflection

scholarly journals Characterization of Wheat Varieties Using Terahertz Time-Domain Spectroscopy

Sensors ◽  
2015 ◽  
Vol 15 (6) ◽  
pp. 12560-12572 ◽  
Author(s):  
Hongyi Ge ◽  
Yuying Jiang ◽  
Feiyu Lian ◽  
Yuan Zhang ◽  
Shanhong Xia
Keyword(s):  
Time Domain ◽  
Terahertz Time Domain Spectroscopy ◽  
Wheat Varieties ◽  
Time Domain Spectroscopy

scholarly journals Terahertz Time-Domain Spectroscopy of Graphene Nanoflakes Embedded in Polymer Matrix

2019 ◽  
Vol 9 (3) ◽  
pp. 391 ◽  
Author(s):  
Anton Koroliov ◽  
Genyu Chen ◽  
Kenneth M. Goodfellow ◽  
A. Nick Vamivakas ◽  
Zygmunt Staniszewski ◽  
...  
Keyword(s):  
Polymer Matrix ◽  
Time Domain ◽  
Thz Radiation ◽  
Complex Conductivity ◽  
Frequency Range ◽  
Terahertz Time Domain Spectroscopy ◽  
Time Domain Spectroscopy ◽  
Graphene Nanocomposites ◽  
Graphene Nanoflakes ◽  
Exfoliated Graphene

The terahertz time-domain spectroscopy (THz-TDS) technique has been used to obtain transmission THz-radiation spectra of polymer nanocomposites containing a controlled amount of exfoliated graphene. Graphene nanocomposites (1 wt%) that were used in this work were based on poly(ethylene terephthalate-ethylene dilinoleate) (PET-DLA) matrix and were prepared via a kilo-scale (suitable for research and development, and prototyping) in-situ polymerization. This was followed by compression molding into 0.3-mm-thick and 0.9-mm-thick foils. Transmission electron microscopy (TEM) and Raman studies were used to confirm that the graphene nanoflakes dispersed in a polymer matrix consisted of a few-layer graphene. The THz-radiation transients were generated and detected using a low-temperature–grown GaAs photoconductive emitter and detector, both excited by 100-fs-wide, 800-nm-wavelength optical pulses, generated at a 76-MHz repetition rate by a Ti:Sapphire laser. Time-domain signals transmitted through the nitrogen, neat polymer reference, and 1-wt% graphene-polymer nanocomposite samples were recorded and subsequently converted into the spectral domain by means of a fast Fourier transformation. The spectral range of our spectrometer was up to 4 THz, and measurements were taken at room temperature in a dry nitrogen environment. We collected a family of spectra and, based on Fresnel equations, performed a numerical analysis, that allowed us to extract the THz-frequency-range refractive index and absorption coefficient and their dependences on the sample composition and graphene content. Using the Clausius-Mossotti relation, we also managed to estimate the graphene effective dielectric constant to be equal to ~7 ± 2. Finally, we extracted from our experimental data complex conductivity spectra of graphene nanocomposites and successfully fitted them to the Drude-Smith model, demonstrating that our graphene nanoflakes were isolated in their polymer matrix and exhibited highly localized electron backscattering with a femtosecond relaxation time. Our results shed new light on how the incorporation of exfoliated graphene nanoflakes modifies polymer electrical properties in the THz-frequency range. Importantly, they demonstrate that the complex conductivity analysis is a very efficient, macroscopic and non-destructive (contrary to TEM) tool for the characterization of the dispersion of a graphene nanofiller within a copolyester matrix.

Characterization of subwavelength plastic fiber utilizing terahertz time-domain spectroscopy

2009 ◽  
Author(s):  
Borwen You ◽  
Tze-An Liu ◽  
Jin-Long Peng ◽  
Ci-Ling Pan ◽  
Ja-Yu Lu
Keyword(s):  
Time Domain ◽  
Terahertz Time Domain Spectroscopy ◽  
Time Domain Spectroscopy

scholarly journals Characterization of Inclusions in Evolution of Sodium Sulfate Using Terahertz Time-domain Spectroscopy

2017 ◽  
Vol 33 (9) ◽  
pp. 1077-1080
Author(s):  
Rima BAO ◽  
Zhikui WU ◽  
Hao LI ◽  
Fang WANG ◽  
Xinyang MIAO ◽  
...  
Keyword(s):  
Time Domain ◽  
Sodium Sulfate ◽  
Terahertz Time Domain Spectroscopy ◽  
Time Domain Spectroscopy
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