• Analytical Science and Technology
• /
• v.13 no.5
• /
• pp.549-557
• /
• 2000

FRIR-ATR spectrometry has been used to monitor the aqueous reactions of compounds without distinct chromophores in ultraviolet and visible regions. For example, hydrolysis reactions of ${\alpha}$-cyclodextrin and ${\gamma}$-cyclodextrin in acidic aqueous solution were studied. FTIR-ATR method has been used for the monitoring of cyclodextrin hydrolysis in 1.0 M. 0.5 M, and 0.1 M HCl solutions, respectively. We also found that the hydrolysis of ${\alpha}$-cyclodextrin produced glucose, but the hydrolysis of ${\gamma}$-cyclodextrin proceeded further to give more fragmented products than glucose.

• Journal of the Mineralogical Society of Korea
• /
• v.21 no.2
• /
• pp.117-127
• /
• 2008

The characteristics of phosphate adsorption-desorption on kaolinite was studied by batch adsorption experiments and detailed adsorbed state of phosphate on kaolinite surface was investigated using ATR-FTIR (Attenuated Total Reflectance-Fourier Transform Infrared) spectroscopy. The phosphorous contents were measured using UV-VIS-IR spectrophotometer with 820 nm wavelength. The adsorbed P was generally increased with increasing pH value in the range of pH 4 to pH 9, however it is not distinct. Moreover the adsorbed P was significantly changed with different initial phosphate concentration. The adsorption isotherms were well fitted with the Langmuir equation, Temkin equation, and Freundlich equation in descending order. The maximum Langmuir adsorption capacity of kaolinite KGa-2 is 232.5 ($204.1{\sim}256.5$) mg/kg and has very higher value than that of kaolinite KGa-1b. Most of adsorbed phosphate on kaolinite were not easily desorbed to aqueous solution, but might fixed on kaolinite surface. However it needs further research about the exact desorption experiment. It was impossible to recognize phosphorous adsorption bands on kaolinite in ATR-FTIR spectrum from kaolinite bands themselves, because the absorption peaks of phosphorous have very similar positions with those of kaolinite, and the intensities of the former were very weak in comparison with those of the latter.

• 보존과학연구
• /
• s.35
• /
• pp.87-98
• /
• 2014

Fourier transform infrared spectroscopy(FTIR-ATR) was applied to chemical analysis for conservation status of 10 human bone remains from Joseon Dynasty. The result of crystallinity index (CI) is $4.25{\pm}0.78$, carbonate to carbonate ratio (C/C) is $0.91{\pm}0.04$ and cabonate content (C/P) is $0.19{\pm}0.06$. The higher histological index (HI) confirmed CI and C/P value was increased and C/C value was reduced. While C/C or C/P values analysis is possible. While DNA analysis can be extracted from the bone, C/C values are lower or C/P values are higher was found to the analysis is possible. Chemical assessment of FTIR and histological index consequence is expected to be applicable as a basis for comprehensive understanding of the conservation status excavated bones.

• Proceedings of the Korean Fiber Society Conference
• /
• 2003.04a
• /
• pp.339-340
• /
• 2003

섬유 고분자 물질의 물리적 성질은 물질의 화학적 구조뿐만 아니라 분자의 배향과 결정화도와 같은 내부 구조에 의해 크게 영향을 받는다. 적외선 분광법은 특정 segment의 배향과 conformation, 결정화도와 같은 내부 구조의 변화를 선택적으로 관찰할 수 있는 장점으로 인하여 섬유 고분자 물질의 연구에 널리 사용되고 있다. 특히 적외선 분광법의 한 방법인 ATR (Attenuated Total Reflection) 방법은 투과에 의한 방법으로는 관찰이 불가능한 fiber, fabric, coating, thick film과 같은 형태의 시료를 관찰 할 수 있는 특성이 있으며 무엇보다 가장 큰 장점은 시료의 Machine Direction (MD), Transverse Direction(TD), Normal Direction (ND)의 세 방향으로 필름의 3차원적 배향 분석이 가능하다는 점이다.$^{1)}$ (중략)

• Proceedings of the Korean Vacuum Society Conference
• /
• 2015.08a
• /
• pp.100.2-100.2
• /
• 2015

반도체 산업이 성장하고 기술이 향상됨에 따라 소자의 소형화가 이루어지고 있다. 공정법으로는 atomic layer deposition (ALD), chemical vapor deposition (CVD) 등이 있다. 이러한 공정을 이용하여 수십 nm까지 미세화가 진행되고 있으며, 복잡한 구조의 박막을 실현하기 위해 전구체의 개발이 활발히 진행되고 있다. 전구체의 특성을 비실시간으로 분석하는 방법으로는 질량 분석법, 가스크로마토그래피, 적외선 분광법 등이 있다. 전구체의 특성을 실시간으로 분석하기 위해 Fourier transform infrared spectroscopy (FTIR)내에 attenuated total reflectance (ATR)를 거치시켰다. 본 연구는 구조를 개선한 ATR-FTIR을 이용하여 Tris-(dimethylamino) Zirconium (CpZr) 전구체의 흡착 거동을 분석하였다. ATR용 crystal은 Ge crystal을 사용했으며, 온도를 각각 30, 40, $50^{\circ}C$에서 CpZr 전구체의 흡착특성을 연구했다. 흡착성을 증가시키기 위해 Ge crystal 표면에 $ZrO_2$나노입자를 분포시켜 흡착특성을 비교 분석하였다. 또한 CpZr 전구체가 흡착된 Ge crystal 표면에 오존가스를 주입시킨 후 변화를 관찰하였다. Ge crystal표면에 나노입자를 분포시켜 CpZr 전구체를 흡착한 결과 나노입자를 분포시키지 않았을 때 보다 흡착강도가 높게 나타났다. 또한 CpZr 전구체가 흡착된 Ge crystal 표면에 오존가스를 주입한 결과 C-H 결합이 분해됨을 확인했다.

• Proceedings of the Optical Society of Korea Conference
• /
• 2000.08a
• /
• pp.122-123
• /
• 2000

혈중 성분, 또는 생체 시료와 빛의 상호작용에 관한 연구는 비침습적 정량분석, 또는 생체 조직의 상태 분석의 가능성을 의미하므로 많은 분야에서 연구가 진행되고 있다. 최근에는 원적외선 검출소자가 급속히 개발됨에 따라 원적외선(8~15$mu extrm{m}$)영역에서의 생체 시료 및 성분들의 정량적인 분석과 영상에 관한 연구가 큰 주목을 받고 있다. 그중 혈중 Glucose 성분의 정량분석에 관한 연구는 여러가지 분광법-특히 NIR 영역에서 흡수, 투과, ATR, NMR 등-으로 활발히 연구되고 있으며$^{1)}$ , 최근에는 FIR 영역에서 혈중 성분들이 특정한 흡수 봉우리를 가지고 있음이 확인되어 이 영역에서의 분광법과 정량 분석에 대한 관심이 고조되고 있다. 본 연구에서는 혈중 성분들의 원적외선 영역에서 빛과의 상호작용인 흡수 spectrum을 측정하여 정량분석에 대한 가능성을 확인하였다. 생체를 이루는 가장 기본인 물에 대한 흡수 spectrum의 연구를 먼저 수행하였고, 혈중 성분중 Glucose, Hb, Albumin 등의 수용액을 농도별로 흡수 spectrum측정을 하였다. (중략)

• Journal of Adhesion and Interface
• /
• v.11 no.4
• /
• pp.162-167
• /
• 2010

In the present work, the effect of electron beam irradiation on the chemical and thermal characteristics of cellulose-based jute fibers was explored by means of chemical analysis, electron spin resonance analysis, ATR-FTIR spectroscopy, thermogravimetric analysis and thermomechanical analysis. Jute fiber bundles were uniformly irradiated in the range of 2~100 kGy by a continuous method using a conveyor cartin an electron beam tunnel. Electron beam treatment, which is a physical approach to change the surfaces, more or less changed the chemical composition of jute fibers. It was also found that the radicals on the jute fibers can be increasingly formed with increasing electron beam intensity. However, the electron beam irradiation did not change significantly the chemical functional groups existing on the jute fiber surfaces. The electron beam irradiation influenced the thermal stability and thermal shrinkage/expansion behavior and the behavior depended on the electron beam intensity.

• Elastomers and Composites
• /
• v.47 no.3
• /
• pp.210-215
• /
• 2012

Whitening phenomena of the EPDM composites with different inorganic filler compositions which were aged at $90^{\circ}C$ for 7 days in air and tap water atmospheres, respectively, were investigated. The aged samples in tap water containing stearic acid exhibited severe whitening phenomena, while all the samples aged in air did not show any whitening. Depending on the filler compositions, there was no big difference in the whitening phenomena. The whitening materials were analyzed using gas chromatography/mass spectrometry (GC/MS), image analysis, energy-dispersive X-ray spectroscopy (EDX), and attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR). The whitening materials were identified to be salts of stearic acid. The salts of stearic acid were formed by reaction of metal cation in tap water and stearic acid in the sample.

• Journal of Korean Society of Environmental Engineers
• /
• v.39 no.7
• /
• pp.426-439
• /
• 2017

This review summarizes advantage and limitation in infrared spectroscopy and computational chemistry to understand rhizospheric interaction among organic acids, oxyanions and metal oxides. Since organic acids and metal oxides determine dynamics of oxyanions in the soil environment, knowledge of fundamental mechanisms is a prerequisite for understanding the interactions at soil-water interface. Attenuated total reflectance-fourier transform infrared spectroscopy (ATR-FTIR) is a powerful tool to measure the interfacial reactions. However, the ATR-FTIR measurements are abstruse, because the optical characteristics for measurements are variable depending on the experimental setup. In addition, spectral overlapping is a primary obstacle to the analysis of the interfacial reaction; thus, it is essential to detect and to deconvolute bands for signal interpretation. In this review, we expained the fundamental principle for spectrum processing, and four band identification methods, such as derivative spectroscopy, two-dimension correlation spectroscopy, multivariate curve resolution, and computational chemistry with example of aqueous phosphate speciation. As a result, spectrum processing and computational chemistry improved interpretation and spectral deconvolution of overlapped spectra in relatively simple systems, but it was still unsatisfactory for the problems in more complexed system like nature. Nevertheless, we believed that our challenge would contribute practically to develop adequate analytical procedure, signal processing and protocols that could help to improve interpretation and to understand the interfacial interactions of oxyanions in natural systems.

• Korean Chemical Engineering Research
• /
• v.43 no.2
• /
• pp.299-304
• /
• 2005

There have been many efforts to use anionic hydrogels as oral protein delivery carriers due to their pH-responsive swelling behavior. The dynamic swelling behavior of poly(methacrylic acid-co-methacryloxyethyl glucoside) [P(MAA-co-MEG)] hydrogels was investigated to determine the mechanism of water transport through these anionic hydrogels. The exponential relation $M_t/M_{\infty}=kt^n$ was used to calculate the exponent, n, describing the Fickian or non-Fickian behavior of swelling polymer networks. The mechanism of water transport through these gels was significantly affected by the pH of the swelling medium. The mechanism of water transport became more relaxation-controlled in the swelling medium of pH 7.0 that was higher than the $pK_a$ of the gels. Experimental results of time-dependent swelling behavior of the gels were analyzed with several mathematical models. Using ATR-FTIR spectroscopy, the effect of ionization of the carboxylic acid groups in the polymer networks on the water transport mechanism was investigated.