• Journal of Adhesion and Interface
• /
• v.20 no.3
• /
• pp.102-109
• /
• 2019

The material constitution of multi-layered thin film coated on the PET base film was analyzed using ATR FT-IR and pyro GC/MS combination. The cross section of the film was acquired by cracking the film after dipping in liquid nitrogen and was observed using optical microscope. Total thickness of the coated film was $70{\mu}m$ and three layers were observed. Since each layers were too thin to analyze directly except the surface layer, analyzable area of each layers were exposed by using a proper solvent and were investigated using ATR FT-IR and pyro GC/MS. Results shows that three layers were commonly consisted of urethane-acrylate copolymers. Also, inorganic and/or metal inclusions detected by XPS and SEM-EDAX were exhibited by nano size $SiO_2$ particles in layer(1) and aluminum flakes in layer(2).

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 2010.04a
• /
• pp.475-476
• /
• 2010

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 2009.10a
• /
• pp.303-304
• /
• 2009

• Applied Science and Convergence Technology
• /
• v.24 no.4
• /
• pp.90-95
• /
• 2015

The adsorption behavior of tris (dimethylamino)-cyclopentadienyl-zirconium (Cp-Zr) precursor using an in-situ attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FT-IR) was studied. In attempt to improve the detection intensity of an adsorbed precursor, nanoparticles were uniformly distributed on the Ge ATR crystal surface employing the spray method. The absorption characteristics studies were carried out over the Ge crystal temperature in the range of $30{\sim}50^{\circ}C$. Upon increasing the temperature, a reduction of absorption was observed. Based on the peak intensities of ATR-FT-IR spectroscopy, higher-$ZrO_2$ absorption efficiency occurs when the nano-particles are utilized compared to pure Ge crystal.

• Korean Journal of Agricultural Science
• /
• v.50 no.4
• /
• pp.675-696
• /
• 2023

Terpenoids, also referred to as terpenes, are a large family of naturally occurring chemical compounds present in the essential oils extracted from medicinal plants. In this study, a nondestructive methodology was created by combining ATR-FT-IR (attenuated total reflectance-Fourier transform infrared), and Raman spectroscopy for the terpenoids assessment in medicinal plants essential oils from ten different geographical locations. Partial least squares regression (PLSR) and support vector regression (SVR) were used as machine learning methodologies. However, a deep learning based model called as one-dimensional convolutional neural network (1D CNN) were also developed for models comparison. With a correlation coefficient (R²) of 0.999 and a lowest RMSEP (root mean squared error of prediction) of 0.006% for the prediction datasets, the SVR model created for FT-IR spectral data outperformed both the PLSR and 1 D CNN models. On the other hand, for the classification of essential oils derived from plants collected from various geographical regions, the created SVM (support vector machine) classification model for Raman spectroscopic data obtained an overall classification accuracy of 0.997% which was superior than the FT-IR (0.986%) data. Based on the results we propose that FT-IR spectroscopy, when coupled with the SVR model, has a significant potential for the non-destructive identification of terpenoids in essential oils compared with destructive chemical analysis methods.

• Analytical Science and Technology
• /
• v.26 no.4
• /
• pp.245-255
• /
• 2013

Identification of paint on victim's clothing and a vehicle are valuable for forensic examination when investigating hit-and-run accidents. Automotive paints on clothes are used to prove a victim caused by traffic accident and to identify a suspected vehicle. The comparison of transferred paints between victim's vehicle and suspected vehicle can be an important evidence in reconstructing the accident situation and in discovering the truth. The paints such as white, yellow, red, blue, or black are hard to examine particle shape under a stereomicroscope because of it is not included aluminum, pearl, and mica flakes in the pigments. The aim of this study under forensic aspect is to compare pigment among basecoat layers of solid paints by identifying inorganic elemental compositions and binder resins of pigments using by micro-FT-IR and micro-XRF spectrometer. The pigment samples were analyzed by using two methods of FT-IR: Reflectance and ATR method. Two methods of FT-IR were useful in discriminating binder resins of pigments by comparing characteristic peaks and patterns of spectra. Also, XRF spectrometer could identify the elemental compositions in inorganic pigments of trace paints which are difficult to compare the identification by FT-IR.

• Proceedings of the Korean Vacuum Society Conference
• /
• 2016.02a
• /
• pp.113-113
• /
• 2016

반도체 산업이 발전하고 기술이 향상됨에 따라 미세화되고 복잡한 구조의 소자가 개발되고 있으며, 2차원 소재 등 다양하고 새로운 소재들이 발견 및 연구되고 있다. 새로운 소재 또는 기술을 이용한 고품질 소자를 개발하기 위해서는 우수한 특성(높은 순도, 우수한 분해 및 반응 특성)을 지닌 증착소재의 개발 및 평가가 선행되어야 한다. 기존의 증착소재의 기본 물성을 측정하는 방법인 단순 기상 Fourier transform infrared spectroscopy(FT-IR) 분석법은 실제 공정에서의 증착경향을 대변하기 어렵다는 단점이 있다. 이러한 단점을 보완하기 위해 개조된 attenuated total reflection (ATR) 액세서리를 이용하여 실제 공정에서의 증착경향을 대변하고자 하였다. 본 연구에서는 반도체 증착소재의 분해 및 표면 흡착 특성을 분석하기 위해 ATR-FTIR 분석법을 이용하여 수행하였으며, 분산안정도에 따른 nanoparticle을 ATR의 크리스탈 표면에 분포시켜 hexamethyldisilazane(HMDS) source의 흡착 효율을 향상시키는 연구를 수행하였다. Nanoparticle의 분산안정도를 높이기 위하여 suspension 상태에서 pH, sonication, 분산제를 이용하였으며, nanoparticle을 ATR crystal 표면에 분포하여 분석한 결과, 분산안정도에 따라 HMDS의 흡착효율이 달라짐을 확인하였다.

• Journal of Adhesion and Interface
• /
• v.13 no.1
• /
• pp.31-37
• /
• 2012

In this study, we investigated the curing properties of UV-LED curable color coating. Specially, the effects of UV-LED wavelength (365, 395, and 405 nm), inert gas, the concentration of photosensitizer, and dual curing on the curing behavior of UV-LED coating systems were studied. The photopolymerization behaviors and the unreacted acrylate groups at Film-air (FA) interface and Film-substrate (FS) interface were investigated by photo differential scanning calorimetry (Photo-DSC) and Fourier-transform infrared spectroscopy with attenuated total reflection (FT-IR/ATR), respectively. Photo-DSC results showed that the heat flow and the ultimate conversion for coating system cured by 405 nm UV-LED were higher than the corresponding values for coating systems cured by 395 and 365 nm UV-LED. FT-IR/ATR results showed that the UV-LED curing systems improved interior and through curing of the coating film, but significantly are affected by oxygen inhibition at FA-interface. The inert environment such as nitrogen purging and the dual curing improved the surface and interior curing of the coating films.

• Rubber Technology
• /
• v.8 no.1
• /
• pp.40-47
• /
• 2007

• Journal of Conservation Science
• /
• v.33 no.5
• /
• pp.391-398
• /
• 2017

This study was conducted to investigate lichen as a typical biomass damage on the surfaces of flagpole-supporting stones in the Beopjusa temple. The lichens present on the flagpole-supporting stones were limited to five species. Two dominant lichen species were identified: Aspicilia sp. and Pertusaria flavicans. One foliose species and one fruticose species, which are rarely observed on crustose lichens, were identified as Xanthoparmelia conspersa and Ramalina sekika, respectively. The lichen inhabiting the black algae layer was confirmed as Leprocaulon textum. ATR-FTIR was performed to analyze the secondary metabolites synthesized by the lichens. By comparing the FTIR spectra of Xanthoparmelia conspersa and Ramalina sekika, the synthesized organic acids were confirmed to differ from each other. Furthermore, the spectral changes and characteristics due to functional groups in the molecules were confirmed.