Papers by Keyword: FTIR

Abstract: This study investigates the functional groups of 3D printing material filaments made from biocomposites using polymers and natural fibers, analyzed through FTIR spectroscopy. The process of making 3D printing filament uses the extrusion method with a single extrusion machine. The integration of natural fibers into polymer matrices provides a sustainable alternative for 3D printing materials, improving mechanical properties while reducing environmental impact. FTIR analysis revealed significant interactions between polymer and fiber components, identifying key functional groups such as hydroxyl and carbonyl that are critical for performance. Functional groups such as hydroxyl (-OH) and carbonyl (C=O) significantly influence the quality of biocomposites through their impact on the material's mechanical, thermal, and interfacial properties. These findings provide insight into the structure-property relationship of these materials, demonstrating their potential for sustainable 3D printing applications.

Abstract: Mineral oil-based lubricants have increased concerns regarding environmental damage, creating an increasing trend of promoting biolubricants based on either vegetable oil or animal oil. The presented work used Apricot kernel oil (Prunus armeniaca) as a base oil to synthesize biolubricant through a chemical process named Transesterification. The presented work has two parts: Tribological analysis of blends of Biolubricant and 15W40 oil on a High Temperature Tribometer with Ball-on-Disc configuration under different Temperature conditions; and performance analysis of prepared biolubricant in the field of Journal Bearing. Also, the Fourier Transform Infrared (FTIR) Spectroscopy was conducted to determine the organic components present in the prepared biolubricant. The performance of biolubricant is compared with the commercially available 15W40 oil. From the experimental results of tribometer, it is found that an optimal blend of both the lubricants provides better tribological performance compared to individual content of the blend. Also, from the results of Journal bearing test rig, it is observed that the maximum pressure and load carrying capacity of prepared biolubricant increases with the increase in journal speed.

Abstract: This study reports the impact of two distinct capping agents on the structural and optical properties of CdZnS nanoparticles (NPs) using an aqueous colloidal synthesis technique. The samples were characterized using SEM, UV-Visible, Photoluminescence (PL) spectroscopy and X-ray diffraction (XRD). In all of the synthesized samples, SEM exhibits a granular texture with uniform distribution of particles. The capping agent helps in crystallite size reduction and hexagonal structure. The variation in the band gap is caused by quantum confinement depicted in PL spectra. The PL analysis also reveals the excitation-dependent blue emission for all the synthesized samples, with the capping agent-processed samples exhibiting a less pronounced blue shift in the emission peak. The IV characteristics measured via four probe shows the semiconducting nature of the synthesized nanoparticles.

Abstract: Asphalt pavement performance is based on several parameters and properties of the materials’ element. surface free energy that the modifier and the asphalt binder both displays. The resistance of the modified asphalt binder to stresses and moisture damage is largely determined by the bond energies. Asphalt binder qualities may be altered by either technical or natural processes, which subsequently impact on the chemical and mechanical characteristics. In addition, a correlated investigation revealed that surface free energy values may be used to assess the compatibility of a binder in relation to moisture-induced damage. Data demonstrates that the incorporation of soft clay into the asphalt binder resulted in a favorable coating and bonding capacity, as compared to the control asphalt binder. moisture-induced damage in HMA is a combined effect of loss of cohesion of asphalt binder and loss of adhesion between asphalt binder and aggregate. It was indicated that the modified binders of BPSC ratios would delay and weaken the oxidation reaction asphalt binder which can enhance the aging process. Based on absorbance peaks of carbonyl and sulfoxide bonds, the addition of BPSC would delay the aging process of asphalt binder.

Abstract: This study aimed to classify the various forms of microplastics pollution present in the road dust and soil of Jambi City. We characterized the microplastics using FTIR, SEM-EDS, and binocular microscopy. The microplastics characterization under a microscope yielded forms such as fibers, fragments, and films. Polyethylene (PE), polyvinyl chloride (PVC), and polystyrene (PS) are the most common types of polymers, according to FTIR analysis. SEM-EDS analysis of microplastics elements showed that chlorine, silicon, carbon, aluminium, sodium, and calcium were the most abundant. The majority of the microplastics (MP) had an average maximum diameter of less than 200 µm. The results of the research indicate that polymeric materials from road dust wear off and travel through stormwater, eventually ending up in open waters and larger ecological niches, and are a major source of microplastics pollution.

Abstract: Geopolymers offer a sustainable alternative to reduce reliance on Portland cement in construction. This study examines coal fly ash and rice husk ash as potential substitutes in geopolymer formulations. Microstructural tests, including chemical composition analysis (SNI 2049-3-2022), Density (SNI 1964-2008), FTIR, and SEM-EDS, were conducted to evaluate their properties. Chemical analysis showed that coal fly ash contains 90.55% silica (SiO₂) and less than 10% calcium oxide (CaO), categorizing it as Class F fly ash, while rice husk ash has 50.86% SiO₂ and 38.41% CaO, both comparable to cement. FTIR confirmed hydroxyl group presence through O-H stretching, while SEM-EDS revealed elements like silicon, aluminum, calcium, and metallic oxides, consistent with their surface morphology. The results demonstrate that coal fly ash and rice husk ash meet the pozzolanic element requirements necessary for geopolymer formation. Their chemical composition, supported by FTIR and SEM-EDS findings, highlights their potential as alternative cement substitutes in sustainable construction.

Abstract: Syzygium cumini is a plant belonging to the Myrtaceae family and is widely used in medicine and food. However, its application in the engineering field is still very minimal, particularly as an anti-corrosion material. There are also limited studies on the quantitative screening of phytochemical and bioactivity of S. cumini. Therefore, this study aims to analyze the chemical compounds of S. cumini fruit as a corrosion inhibitor as well as determine total tannin (TTC) and flavonoid (TFC) content. The extraction process was carried out with a soxhlet extractor using 96% ethanol solvent. Characterization was then conducted using FTIR (Fourier Transfer Infrared) test and total antioxidant test with a UV-Vis spectrophotometer. Spectrum analysis showed the presence of Hydroxyl (O-H), Alkane (C-H), Carbonyl (C=O), Aromatic Ether (C-O), and Amine (C-N) functional groups. The results also revealed that TTC was 26.83% higher, while TFC was 2.11%. In addition, S. cumini fruit was reported to contain high functional groups and antioxidant compounds, which were useful as active molecular inhibitor ingredients.

Abstract: Dye-sensitized solar cell (DSSC) is a well-known solar cell device because it can convert electrical energy from solar energy. In addition, DSSC has many benefits to offer humankind such as low cost in production, flexibility and eco-friendliness. However, the efficiency provided for DSSC operation is still low compared to the efficiency offered by semiconductor materials. Thus, four different solvents are used to extract natural dye from mangosteen pericarp in order to increase the efficiency in DSSC: pure ethanol, ethanol containing 20 % distilled water, ethanol containing 1 % hydrochloric acid (HCl) and ethanol containing 1 % acetic acid. Other than that, the dyes are examined to observe the optical properties by using Fourier transform infrared spectroscopy (FTIR) and ultraviolet-visible spectroscopy (UV-Vis). FTIR analysis resulted in the functional group presence in the dyes while UV-Vis shows that absorption activity exists in the mangosteen pericarp dyes. In addition, the efficiency of mangosteen pericarp dyes with pure ethanol, ethanol containing 20 % distilled water, ethanol containing 1 % hydrochloric acid (HCl) and ethanol containing 1 % acetic acid are calculated which are 0.080 x 10^-3 %, 0.554 x 10^-3 %, 0.126 x 10^-3 % and 0.102 x 10^-3 % respectively.

Abstract: The synthesis of Cd_0.5Zn_0.5S/PVP and Cr_x: Cd_0.5-xZn_0.5S/PVP(x = 0.02, 0.04, 0.06, 0.08) nanoparticles were carried out using a chemical co-precipitation reaction using homogeneous solutions of cadmium, zinc and chromium salts. The impact of Cr doping on the morphological, structural, and optical characteristics of nanoparticles was investigated in this study. Energy dispersive analysis of X-rays (EDAX), scanning electron microscopy (SEM), X-ray diffraction (XRD), and Diffuse Reflectance spectroscopy (DRS) have been utilized to examine the structural, optical, and morphological properties of elements. EDAX analysis verified the existence of chromium (Cr) within the cadmium zinc sulphide (CdZnS) crystal structure. The XRD analysis revealed that the Cr doped CdZnS nanoparticles exhibited crystallization in the zincblende structure, with a predominant orientation along the (1 1 1) plane. The nanoparticles have an average size ranging from 3 to 6 nm. The particle size determined from the SEM images corresponded with the findings from the XRD analysis. The DRS revealed that the increase in Cr concentration caused a shift of the absorption edge towards lower wavelengths. The bandgap energy estimates ranged from 3.85 to 4.05 eV. The blueshift is caused by the quantum confinement phenomenon.

Abstract: DL-valinium maleate [DLVM] compound was grown as single crystals at room temperature by gradual evaporation from an aqueous solution. The classical nucleation theory was examined to maximize the growth conditions for producing high-quality crystals, Nucleation kinetics studies reveal that the crystal has been grown at room temperature 313 K for which predicted critical supersaturation is 6.19. The grown compound DLVM crystallized in a triclinic system with a centrosymmetric space group P1, according to single crystal and powder X-ray diffraction experiments. The lattice parameters were calculated as a= 6.17 Å, b= 9.68 Å, c= 10.59 Å, α= 105.75°, β = 105.67º and γ = 104.69° with unit cell volume 548.2 ų. The presence of functional groups in the grown compound has been identified by using Fourier Transform Infrared [FTIR] experiments. NMR studies were used to examine the structural features of DLVM compounds. Since the grown material belongs to the centrosymmetric space group, the material has been found to exhibit third-order NLO property. The Z-scan technique was used to analyse the third-order nonlinear behaviour of the grown crystal. The technique was very useful in evaluating the nonlinear refractive index n₂, absorption co-efficient β, and nonlinear optical susceptibility χ⁽³⁾ of the grown material. Hence, the grown crystal finds useful applications in optoelectronics. The antibacterial activity of the title compound was also studied by using the Agar disc diffusion method against the standard bacteria Klebsiella pneumonia, Staphylococcus aureus and Enterococcus faecalis. The results of the antibacterial activity experiment show that the synthesized DLVM crystal will be a good option for the creation of antibiotic medicines that will combat the tested bacterial strains.