Mica Flakes Research Articles

Effect of mica content on pore pressure and stress-strain response of micaceous sand using energy dissipation and different failure mechanisms

ABSTRACT Mica particles are platy, flexible and resilient in nature having numerous intact mica flakes foliated over each other with low stiffness. Presence of mica among sand particles creates complex geometric arrangements due to bridging, ordering or pore filling phenomena; which make micaceous sand highly compressible with low shear strength. When flaky mica particles are augmented among spherical sand particles, the governing shear behaviour mechanisms substantially varies due to redistribution of contact forces among sand-sand matrix, sand-mica matrix and mica-mica matrix formation of micaceous sand. The current experimental study investigated the effect of mica content on pore pressure and stress-strain behaviour of micaceous sand due to varying sand-mica microstructural evolutions. The variation in shear strength parameters were studied under different failure criteria: peak deviatoric stress and peak effective stress ratio. The deviations in mechanical behaviour of micaceous sand at varying mica content were further examined through cumulative dissipated strain energy mechanisms to understand the inter-particle contact-force transfer mechanisms for varying sand and mica matrix.

Microbially induced sedimentary structures (MISSs) from the Lower Triassic Kockatea Formation, northern Perth Basin, Western Australia: Palaeoenvironmental implications

Like microbialites, microbially induced sedimentary structures (MISSs) are commonly observed in siliciclastic and mixed carbonate siliciclastic settings in the Lower Triassic, and are represented by several morphological types including wrinkle structures. However, their origin and their role in the Early Triassic ecosystem recovery is currently a hot topic of debate. Herein we report and describe abundant wrinkle structures from the Smithian Kockatea Shale Formation of Northampton area in the Perth Basin, Western Australia, on the basis of detailed field observations as well as petrographic and SEM examinations of rock thin sections. The surficial morphologies of wrinkles are characterized by closely spaced crests and ridges on the upper bedding surfaces, together with other forms such as pitted bulges and reticulated ridges. Detailed petrologic analysis revealed that the Smithian wrinkle structures from the northern Perth Basin possess a distinct vertical profile: (1) cross-stratified/lamianted sandstone, (2) alternating laminated layers and sandstone, (3) laminated layers, and (4) wrinkled layers, in an ascending order. The wrinkled layers are overlain by thin shale. Laminated layers beneath wrinkled surfaces comprise densely packed, pronounced, wavy laminae. Mica flakes in laminations show a preferred alignment parallel to bedding under SEM imaging, suggesting the binding and trapping of the former presence of a microbial matground. These evidences support that the Early Triassic wrinkle structures from the Smithian Kockatea Formation are biogenic in origin. Close association of both trace and body fossils with the wrinkle structure-bearing layers is interpreted to indicate the presence of a matground ecosystem in which some small gastropods and various trace-making animals lived, possibly taking the habitat as a refuge. The global temporal and spatial occurrences of Early Triassic MISS were tabulated and analyzed, revealing a wide range of palaeoenvironmental distributions and the seemingly selected association between metazoans and certain MISS. As to why only some MISSs have been found together with metazoans remains as an open question. It will require further investigation especially with regard to the specific type of microbes that had built the microbial matground ecosystems and their interplay with the hosted metazoans in the aftermath of the end-Permian mass extinction.

Effect of Successive Impact Loading on Compactability, Microstructure, and Compressibility Behavior of Micaceous Sand

Micaceous soils are generally known for their high compressibility, low compactability, and low shear strength behavior. Mica particles are flaky, flexible, and resilient nature with low stiffness and hardness due to numerous foliated intact mica flakes, which allows them to undergo deformation upon loading and rebound upon unloading. However, the weak mica particles among strong sand particles are highly susceptible to crushing, which affects the performance of geotechnical structures. The current research is focused on the effect of successive impact loading on crushability, compactability, compressibility, and microstructure of micaceous sand containing 30% mica. Significant increase in MDD, fine content, and compression index of micaceous sand was observed with the increase in successive cycles of impact loading. The reduction in resilient nature of micaceous soil due to crushing of intact mica particles along with the reduced bridging and ordering combination of sand-mica particles could be responsible for altered compactability behavior of micaceous sand. The increased percentage of fines due to crushing of mica particles caused the reduction in stiffness leading to higher compressibility of micaceous soil.

Thermoset stator bar insulation systems

Generator stator bar insulation systems have experienced a steady evolution since the beginning of central power plants in the early 1900s. Initially (1900-1915), natural products were used, e.g., shellac, mica flake, paper. These materials apparently worked well on small, low-duty units, but were inadequate beyond perhaps 10 or 15 MW. As units grew in size problems developed, and during the period 1915-1950, asphalt-mica was the common system. These systems used mica, with paper or cloth carrier, and vacuum-pressure impregnation with carefully selected asphalt compounds. These systems initially performed well, with minor problems associated with puffing and asphalt bleeding if operated at too high a copper temperature, above roughly 95°C. But as generator size increased, the “tape migration” issue became so destructive that use of asphalt-mica systems was discontinued in the 1950s for generators rated higher than about 25 MW [1].

Preparation of Nanosized Gd2O3:Eu3+ Red Phosphor Coated on Mica Flake and Its Luminescent Property

Preparation of Nanosized Gd2O3:Eu3+ Red Phosphor Coated on Mica Flake and Its Luminescent Property

Hydrocarbons in phlogopite from Kasenyi kamafugitic rocks (SW Uganda): cross-correlated AFM, confocal microscopy and Raman imaging

This study presents a cross-correlated surface and near surface investigation of two phlogopite polytypes from Kasenyi kamafugitic rocks (SW Uganda) by means of advanced Atomic Force Microscopy (AFM), confocal microscopy and Raman micro-spectroscopy. AFM revealed comparable nanomorphology and electrostatic surface potential for the two mica polytypes. A widespread presence of nano-protrusions located on the mica flake surface was also observed, with an aspect ratio (maximum height/maximum width) from 0.01 to 0.09. Confocal microscopy showed these features to range from few nm to several μm in dimension, and shapes from perfectly circular to ellipsoidic and strongly elongated. Raman spectra collected across the bubbles showed an intense and convolute absorption in the range 3000–2800 cm−1, associated with weaker bands at 1655, 1438 and 1297 cm−1, indicating the presence of fluid inclusions consisting of aliphatic hydrocarbons, alkanes and cycloalkanes, with minor amounts of oxygenated compounds, such as carboxylic acids. High-resolution Raman images provided evidence that these hydrocarbons are confined within the bubbles. This work represents the first direct evidence that phlogopite, a common rock-forming mineral, may be a possible reservoir for hydrocarbons.

Improvement of mechanical and dielectrical properties of ethylene propylene diene monomer (EPDM)/barium titanate (BaTiO 3 ) by layered mica and graphite flakes

Abstract In this study, ethylene propylene diene monomer (EPDM)/barium titanate (BaTiO3)/mica (or graphite) composites with different volume fraction of mica (or graphite) were prepared by two-roll milling process. Thermal conductivity, crosslink density, cure, rheological, mechanical and dielectrical properties of composites were investigated. The results of rheological properties indicated that the 15 vol% mica made the complex viscosity of EPDM/BaTiO3 compound to become non-sensitive to varying shear. In terms of mechanical properties, only 5 vol% graphite flakes remarkably improved the tensile strength of EPDM/BaTiO3 (70/30) from 7.47 MPa to 13.20 MPa (76% increase). By comparison, the 20 vol% mica just increased the tensile strength of EPDM/BaTiO3 (70/30) to 12.10 MPa. In addition, 20 vol% graphite flakes boosted the thermal conductivity and dielectric constant of EPDM/BaTiO3 (70/30) from 0.323 W m−1 K−1 and 7.1 at 40 MHz to 2.421 W m−1 K−1 (749% increase) and 70 at 40 MHz (almost 1000% increase), respectively. The excellent electric and thermal performance was attributed to the mobile π electrons in graphite flakes.

The reclamation of mica flakes from tailing disposal using gravity separators and flotation

A sample from the small-sized tailing pile of an Iranian mica processing plant was subjected to a series of mica recovery experiments. Mineralogical and microscopic investigations indicated that the dominant mica mineral was phlogopite which was accompanied by plagioclase feldspars. Before beneficiation studies, the particle size distribution of the representative sample was obtained, and the specifications of each size fraction were investigated in detail. It was observed that the largest portion of mica (31%) is accumulated in the size range of 0.3 to 2.0 mm. Afterward, gravity concentration and flotation experiments were carried out. Results proved that shaking table could produce a mica concentrate with grade of 74%. Also, according to the flotation tests, it seemed the best size fraction was -150+75, and after that, -100+150. Flotation in combination with attrition scrubbing produced a concentrate with 92% mica content and 70% recovery. Finally, with respect to the results of all implemented experiments, a processing flow sheet was proposed for mica reclamation from the mentioned waste disposal.

Properties of rigid polyvinyl chloride foam composites reinforced with different shape fillers

In this study, the effect of reinforcements’ shape and type on the mechanical, thermal, and morphological properties of polyvinyl chloride (PVC) foam composites is investigated. For this purpose, three different fillers, longitudinal structure glass fiber, flaky structure mica, and spherical structure fly ash, were selected to prepare PVC foam composites with 0–20 wt% loading. The tensile strength in both 10 wt% reinforced mica and glass fiber composites improved slightly, while it decreased with the addition of 10 wt% fly ash. Flexural strength reached its maximum in mica and fly ash-filled composites at 10 wt% loading. Meanwhile, flexural strength exhibited higher saturation levels of longitudinal glass fibers due to their penetration within the foam cells. Charpy impact strength measurements showed a decreasing trend with increasing the filler content; however, the rate of reduction was the lowest in PVC/glass fiber foam composites. The effect of filler type and geometry on thermal and dynamic mechanical properties of PVC foam composites was studied using thermogravimetric analyzer and dynamic mechanical analysis, respectively. First decomposition temperature of PVC composites dropped slightly with the addition of fillers, where glass fiber-reinforced foam composites exhibited the lowest rate of reduction. The second decomposition step of PVC foam composites shifted toward higher temperatures with increasing the filler content. Fly ash was found to be more effective in improving the second decomposition temperature. The dynamic modulus of mica and glass fiber-reinforced composites showed an increasing trend below and above glass transition temperature, up to 10 wt% loading, while the storage modulus in fly ash-reinforced composites increased with increasing the filler content at a constant rate. Morphological studies revealed that mica flakes with a paralleled structure within cell walls and glass fibers with a penetrated structure within the cell bubbles exhibited higher agglomeration compared to fly ash composites.

Source areas of the Grybów sub-basin: micropaleontological, mineralogical and geochemical provenance analysis (Outer Western Carpathians, Poland)

Abstract The Grybów Unit occurring in the Ropa tectonic window was the subject of micropaleontological and geochemical investigation. Studies, based on calcareous nannofossils, proved that the level of reworked microfossil is not higher than 22 % and it varies between two sections. Quantitative analyses of the reworked assemblages confirmed the domination of Cretaceous and Middle Eocene species. The Sub-Grybów Beds, Grybów Marl Formation and Krosno Beds were assigned to the Late Oligocene and represent the terminal flysch facies. Detrital material accumulated in the Oligocene sediments originated from the Marmarosh Massif, which is the eastern prolongation of the Fore-Magura Ridge. The microscopically obtained petrological features agree with the chemical composition of the samples. Mica flakes, rounded grains of glauconite, heavy mineral assemblage, including abraded grains of zircon, rutile and tourmaline as well as charred pieces of plant tissues are reworked components. Enrichment in zircon and rutile is confirmed geochemically by positive correlation between Zr and SiO2. Zr addition is illustrated on 10×Al2O3–Zr–200×TiO2 and Zr/Sc vs. Th/Sc diagrams. Interpretation of the A–CN–K diagram and variety of CIA and CPA values indicate that the source rocks were intensely weathered granite-type rocks.

Saqqar: A 34 km diameter impact structure in Saudi Arabia

AbstractHere we present the first proof of an impact origin for the Saqqar circular structure in northwestern Saudi Arabia (Neville et al. ), with an apparent diameter of 34 km, centered at 29°35′N, 38°42′E. The structure is formed in Cambrian–Devonian siliciclastics and is unconformably overlain by undeformed Cretaceous and Paleogene sediments. The age of impact is not well constrained and lies somewhere between 410 and 70 Ma. The subsurface structure is constrained by 2‐D reflection seismic profiles and six drilled wells. First‐order structural features are a central uplift that rises approximately 2 km above regional datums, surrounded by a ring syncline. The crater rim is defined by circumferential normal faults. The central uplift and ring syncline correspond to a Bouguer gravity high and an annular ring‐like low, respectively. The wells were drilled within the central uplift, the deepest among them exceed 2 km depth. Sandstone core samples from these wells show abundant indicators of a shock metamorphic overprint. Planar deformation features (PDFs) were measured with orientations along (0001), {103}, and less frequently along {101} and {104}. Planar fractures (PFs) predominantly occur along (0001) and {101}, and are locally associated with feather features (FFs). In addition, some shocked feldspar grains and strongly deformed mica flakes were found. The recorded shock pressure ranges between 5 and 15 GPa. The preserved level of shock and the absence of an allochthonous crater fill suggest that Saqqar was eroded by 1–2 km between the Devonian and Maastrichtian. The documentation of unequivocal shock features proves the formation of the Saqqar structure by a hypervelocity impact event.

3.46 Ga Apex chert ‘microfossils’ reinterpreted as mineral artefacts produced during phyllosilicate exfoliation

Filamentous microstructures from the 3.46billionyear (Ga)-old Apex chert of Western Australia have been interpreted as remnants of Earth's oldest cellular life, but their purported biological nature has been robustly questioned on numerous occasions. Despite recent claims to the contrary, the controversy surrounding these famous microstructures remains unresolved.Here we interrogate new material from the original ‘microfossil site’ using high spatial resolution electron microscopy to decode the detailed morphology and chemistry of the Apex filaments. Light microscopy shows that our newly discovered filaments are identical to the previously described ‘microfossil’ holotypes and paratypes. Scanning and transmission electron microscopy data show that the filaments comprise chains of potassium- and barium-rich phyllosilicates, interleaved with carbon, minor quartz and iron oxides. Morphological features previously cited as evidence for cell compartments and dividing cells are shown to be carbon-coated stacks of phyllosilicate crystals. Three-dimensional filament reconstructions reveal non-rounded cross sections and examples of branching incompatible with a filamentous prokaryotic origin for these structures.When examined at the nano-scale, the Apex filaments exhibit no biological morphology nor bear any resemblance to younger bona fide carbonaceous microfossils. Instead, available evidence indicates that the microstructures formed during fluid-flow events that facilitated the hydration, heating and exfoliation of potassium mica flakes, plus the redistribution and adsorption of barium, iron and carbon within an active hydrothermal system.

Effects of M2+ (M = Ca, Sr, and Ba) Addition on Crystallization and Microstructure of SiO2-MgO-Al2O3-B2O3-K2O-F Glass

In understanding the effect of K+ substitution by M2+ (M = Ca, Sr, and Ba) on crystallization and microstructural properties of boroaluminosilicate glass system, the SiO2-MgO-Al2O3-B2O3-MgF2-K2O-Li2O-AlPO4 glasses were prepared by single-step melt-quenching at 1500°C. Density of base glass (2.64 g·cm−3) is found to be decreased in presence of CaO and SrO. Tg is increased by 5–10°C and Td decreased by 13–20°C on addition of M2+. The variation of Tg, Td and decrease of thermal expansion (CTE) from 7.55 to 6.67–6.97 (×10−6/K, at 50–500°C) in substituting K+ by M2+ are attributed to the higher field-strength of Ca2+, Sr2+, and Ba2+. Opaque mica glass-ceramics were derived from the transparent boroaluminosilicate glasses by controlled heat treatment at 1050°C (duration = 4 h); and the predominant crystalline phase was identified as fluorophlogopite (KMg3AlSi3O10F2) by XRD and FTIR study. Glass-ceramic microstructure reveals that the platelike mica flake crystals predominate in presence of K2O and CaO but restructured to smaller droplet like spherical shaped mica on addition of SrO and BaO. Wide range of CTE values (9.54–13.38 × 10−6/K at 50–800°C) are obtained for such glass-ceramics. Having higher CTE value after crystallization, the CaO containing SiO2-MgO-Al2O3-B2O3-MgF2-K2O-Li2O-AlPO4 glass can be useful as SOFC sealing material.

Effect of E-glass Fibers and Phlogopite Mica on the Mechanical Properties and Dimensional Stability of Rigid PVC Foams

In this work, short E-glass fibers and mica were used to enhance the dimensional stability and mechanical properties of extruded rigid polyvinyl chloride foams. Experimental results show that the dimensional stability increased by 50%, and heat resistance of the polyvinyl chloride foam improved as the amount of reinforcing solids increased in the composites. The storage modulus, tensile, and flexural strengths of the composites improved by 220, 82, and 46%, respectively. Scanning electron microscope micrographs show good interaction between glass fibers and foam cells and a good dispersion and orientation of the mica flakes along the cell walls of the polyvinyl chloride foam.

Solar Reflective Pigment of TiO<sub>2</sub> Nanoparticle Coated on Mica and Thermal Property of its Isolation-Heat Paint

TiO2 coated mica (TiO2/Mica) as solar reflective pigment was prepared under hydrothermal treatment. Dispersed TiO2 nanosol, having an average particle size of about 25-30nm, was coated on mica flake by the difference between the surface charge of the particles at pH 2 and then calcined at 850°C to stabilize the coated layer on mica. The CIE color coordinate and total solar reflectance (TSR) properties of these pigments were investigated in relation to thickness variation of TiO2 layer coated on mica having various lateral sizes. Dense and uniform TiO2 layers were tightly coated on the surfaces on mica substrates. Isolation-heat paints were prepared with 20wt% pigments fully dispersed in acryl-urethane resin and several additives to coat the film uniformly. Thermal property of these films, recorded by an isolation-heat measuring system, was observed for the relationship of TSR value according to the thickness of TiO2 layer and mica’s lateral size, compared to TiO2 itself.

Complex hydrothermal alteration and illite K–Ar ages in Upper Visean molasse sediments and magmatic rocks of the Variscan Badenweiler-Lenzkirch suture zone, Black Forest, Germany

Post-collisional Upper Visean molasse sediments and magmatic rocks of the Badenweiler-Lenzkirch Zone reveal by microscopy of thin sections different degrees of hydrothermal illitization of feldspar and mica particles, and XRD, IR and XRF data of the <2 µm fractions show illitic material as the dominant clay mineral consisting of a mixture of 1M and 2M1 polytypes. Moreover, small amounts of illite/smectite mixed-layer minerals of R1-ordering are proved in the granites. In the separates, two illite mixing lines with different Fe + Mg contents are verified between authigenic illite from feldspar alteration and detrital illite in the molasse sediments, as well as between authigenic illite from feldspar alteration and altered mica flakes in the granites. Fe-rich detrital chlorite is present within the molasse sediments, while mixtures of high aluminous Fe-poor dioctahedral/di-trioctahedral chlorite with randomly interstratified chlorite/smectite mixed-layer minerals are formed from feldspar alteration in the granites. Illite K–Ar dating of the <2 and <0.63 µm fractions yields hydrothermal illitization of feldspar and partial resetting of the K–Ar system of detrital illite and mica flakes in the molasse sediments at ≥200 °C during Upper Permian to Middle Triassic times, while the granites in the eastern part of the study area were not altered contemporaneously. In contrast, hydrothermal activity at ≤200 °C during Upper Jurassic to Lower Cretaceous times occurred in the granites, whereas these temperatures were too low for resetting the older ‘Permo–Triassic’ illite K–Ar ages in the molasse rocks. Within both K–Ar age clusters, the data are seen to decrease with grain size and portion of illite 2M1 polytype. The alteration phenomena indicate multiple hydrothermal episodes in the study area, and they match those from the Central and Western European crust as fluid supply was controlled geodynamically by episodic break up of Pangea.

Mechanical Properties and Dimensional Stability of Rigid PVC Foam Composites Filled with High Aspect Ratio Phlogopite Mica

High aspect ratio Phlogopite mica was used to enhance the dimensional stability and mechanical properties of extruded rigid Polyvinyl Chloride (PVC) foam. Mica was added to rigid PVC compound at different concentrations (0 - 20 wt%) and processed using a single screw profile extruder. PVC foam-Mica composites were characterized for their dimensional stability, and structural, thermal, and mechanical properties. Experimental results showed that the dimensional stability increased by 44% and heat resistance of the samples improved as the amount of mica increased in the composites. The storage modulus and tensile strength of the composites were also enhanced with the addition of mica. However, increasing the concentration of mica had no significant effect on the impact and flexural properties of the composites. SEM micrographs show good dispersion and orientation of the mica flakes along the cell walls of the PVC foam. Overall, the platy structure and physical properties of mica seemed to have played an important role in providing good interfacial bonding with the cell membranes of the foam, thus enhancing the dimensional stability of the PVC- Mica foam composites.

A Petrographic Study of the Three Forks Formation (Upper Devonian), Williston Basin, North Dakota: Based on Thin Section Analysis, XRD and SEM

Deeply buried below 8,000 ft, the Three Forks Formation in North Dakota displays a variety of interesting diagenetic characteristics including dolomitization and hematite precipitation. Samples from three lithofacies are analyzed by thin section and SEM petrography and combined bulk and clay XRD analyses. Key aspects controlling the porosity and permeability of this formation are revealed by focusing on the detail mineralogy, rock type and diagenetic mineral distribution, and overall reservoir quality. Results prove that the Three Forks mineralogy is dominated by dolomite, along with substantial hematite, monocrystalline quartz, and mica flakes with trace feldspar, calcite, and pyrite. Clays mainly consist of illite together with minor chlorite and kaolinite and are associated with the scattered clasts. The reservoir quality is controlled by intercrystalline, rare microvuggy, and microporosity types that result from diagenetic and depositional events. Three stages of the dolomitization process are identified and discussed. Our hypothesis is that dolomitization commenced soon after deposition and was pervasive as no original carbonate texture is detectable.

Effects of nucleating agents on crystallization and microstructure of fluorophlogopite mica-containing glass–ceramics

The alteration of crystallization behavior, microstructure, and thermal properties of fluorophlogopite mica-containing glass–ceramics by nucleating agent is systematically studied. TiO2, TiO2 + ZrO2, and ZrO2 have been doped as the nucleating agents in the SiO2–MgO–Al2O3–B2O3–K2O–MgF2 (BMAPS) glass system and prepared by the melt-quench technique. The glass without nucleating agent is also prepared to ascertain the influence of nucleating agent. Addition of nucleating agents effectively increases the softening as well as glass transition temperatures. From the DSC study, it is found that the fluorophlogopite mica crystallization exotherm exhibited in the temperature range 800–850 °C and the activation energy varies in the range 167–182 kJ/mol. The opaque mica glass–ceramics are derived from these BMAPS glasses by a controlled heat treatment process and heat treatment at 1050 °C is found to be optimum. The mica crystals were identified as fluorophlogopite for all the four BMAPS glasses by X-ray powder diffraction (XRD) and subsequently confirmed by FTIR spectroscopy. Excellent matching with fluorophlogopite crystal was obtained in Zirconia-containing glass–ceramic as perceived from the XRD and FTIR studies. The microstructure of interlocked card-like mica flake crystals is found to form as seen from scanning electron microscopy, and such microstructure is obtained when ZrO2 has been used as nucleating agent. Glass–ceramic without nucleating agent possesses Vickers hardness value 4.58 Gpa and it is increased with addition of the nucleating agent (5.67–6.56 GPa), ZrO2-containing glass–ceramic possess lower hardness (5.67 GPa) and better machinability. Therefore, ZrO2 is the most efficient nucleating agent to generate fluorophlogopite mica in these glass–ceramics useable for SOFC applications.

법과학적 관점에서 FT-IR과 XRF를 이용한 단색 페인트의 안료 비교

교통사고로 인해 피해자 의류 또는 사고관련 차량에 부착된 페인트는 법과학적으로 중요한 증거물이다. 의류에 부착된 페인트는 용의차량을 추적하고 교통사고의 피해자임을 입증할 수 있는 단서가 되며, 피해차량과 용의차량에 상호 전이되어 부착된 페인트는 페인트의 동일성 비교로써 사고의 진실을 밝히고 사고 상황을 재구성하는데 중요한 역할을 한다. 부착된 페인트는 보통 미량의 시료이고 특히 단색인 흰색, 노란색, 적색, 청색, 검정색인 경우 페인트 동일성 비교는 입체현미경으로 색상과 안료에 함유된 알루미늄, 펄, 마이카 등의 입자 형상에 대한 상호 비교가 곤란하므로 이에 대한 분석법이 요구되었다. 따라서 본 연구의 목적은 단색의 차량 페인트에서 색상을 구현하는 basecoat 층에 대해 micro-FT-IR과 micro-XRF를 이용하여 안료의 바인더 수지와 무기안료의 구성원소를 확인하여 법과학적 측면에서 페인트 동일성 비교를 하고자 하였다. FT-IR 분석은 시료를 전처리 없이 Reflectance와 ATR 2가지 방법을 병용했으며 Reflectance 스펙트럼은 <TEX>$4000{\sim}2000cm^{-1}$</TEX> 영역에서 aromatics과 aliphatic, acrylonitrile 등의 피크 정보를 얻었고 ATR 스펙트럼은 <TEX>$2000{\sim}650cm^{-1}$</TEX> 영역에서 carbonyl, isocyanate, carbamate 등의 피크 및 피크의 패턴 비교로 안료의 바인더 수지를 비교하는데 이용하였다. 또한 XRF 분광법은 미량 페인트의 무기안료에 함유된 구성원소를 확인하여 적외선 흡수스펙트럼으로 동일성 비교가 곤란한 시료에 대해 판별 가능하게 하였다. 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.