Investigation of Mn2+-Doped Stearic-Acid Through XRD, Raman, and FT-IR, and Thermal Studies Rodrigo M. Rocha, Marinaldo V. de Souza Junior, Luiz F. L. Silva, Paulo T. C. Freire, Gardênia S. Pinheiro, et al. Quantum Beam Science, 2025 In this research, we investigated the influence of Mn2+ ions on the packing in stearic acid (SA) crystals through the use of Raman spectroscopy, X-ray diffraction (XRD), and Fourier transform infrared (FT-IR) spectroscopy. The crystals investigated were obtained utilizing the slow evaporation methodology in a hexane solution under varying manganese (Mn) concentrations sourced from MnSO4 5H2O (0.5, 1.0, 1.5, 2.0, 4.0, and 6.0%). XRD studies indicated that all SA crystals were grown in the Bm form (monoclinic), favoring the gauche conformation in molecular packing. Additionally, crystalline lattice modifications were observed through Raman spectral changes in the low-vibrational energy region. Variations in the intensities and Raman shifts in two lattice vibrational modes, centered at approximately 59 and 70 cm−1, revealed that two types of hydrogen bonds are distinctly affected within the crystalline lattice. Furthermore, the unit cell parameters (a, b, c, and β) were determined via Rietveld refinement, and their behavior was analyzed as a function of Mn concentration. The results indicated that Mn2+ ions exert a strain and deformation effect on the unit cell. Lastly, differential scanning calorimetry (DSC) was employed to evaluate the thermal stability of the Bm form of SA crystals.
Influence of pH on the properties of tungsten trioxide synthesized by the hydrothermal method DC Costa, CDA Lima, MEHM Costa, CL Lima, IAL dos Santos, ... Solid State Sciences, 108352 , 2026 2026
In situ Investigation of Structural Stability and Reversible Conformational Changes in Gd2 (WO4) 3 at High Temperatures J dos Santos Silva, AW Miranda, IAL dos Santos, EC Serra, JVB Moura, ... Journal of Molecular Structure, 145948 , 2026 2026
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Surface Sensitivity of Mesoporous Carbon-Supported Iron Catalysts in the Fischer–Tropsch Synthesis: An In Situ XPS Site Evolution at Distinct Reaction Conditions JPS Nascimento, AC Oliveira, FAN Fernandes, GS Pinheiro, JP Holgado, ... Energy & Fuels 39 (33), 15634-15647 , 2025 2025 Citations: 2
Effects of defective nanostructured alumina supports on the syngas production by tri-reforming of methane GM Bertoldo, AC Oliveira, GD Saraiva, GS Pinheiro, R Lang, EM Assaf, ... Catalysis Today 454, 115280 , 2025 2025 Citations: 1
Preparation and Application of Sodium–Lanthanum Molybdate for the Photocatalytic Degradation of Coomassie Brilliant Blue G-250 Dye CDA Lima, JA Borges, IAL Santos, AA Hidalgo, JA Osajima, AS Almeida, ... ACS omega 10 (16), 16006-16014 , 2025 2025 Citations: 2
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Investigation of Mn 2+ -Doped Stearic-Acid Through XRD, Raman, and FT-IR, and Thermal Studies RM Rocha, MV de Souza Junior, LFL Silva, PTC Freire, GS Pinheiro, ... Quantum Beam Science 9 (1), 8 , 2025 2025 Citations: 3
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Investigation of the Deactivation Behavior of MeMo/La 2 O 3 -Al 2 O 3 - and MeMo/Nb 2 O 5 Supported Catalysts (Me = Pt, Ni, and Co) in Tri-Reforming of Methane JP Nascimento, RCF Bezerra, EM Assaf, AF Lucredio, RS Araujo, ... Energy & Fuels 37 (5), 3836-3853 , 2023 2023 Citations: 10
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Effect of Fe (III) on L-asparagine monohydrate investigated under low-and high-temperature conditions EJ Gomes, JA Lima Jr, PTC Freire, GS Pinheiro, FF de Sousa, ... Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 241, 118643 , 2020 2020 Citations: 8
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MOST CITED SCHOLAR PUBLICATIONS
Biaxial Strain Transfer in Supported Graphene C Bousige, F Balima, D Machon, GS Pinheiro, A Torres Dias, J Nicolle, ... Nano Letters , 2017 2017 Citations: 68
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Phonon properties of β-Ag2MoO4: Raman spectroscopy and ab initio calculations JVB Moura, JG da Silva Filho, PTC Freire, C Luz-Lima, GS Pinheiro, ... Vibrational Spectroscopy 86, 97-102 , 2016 2016 Citations: 41
High-pressure Raman spectra of L-isoleucine crystals AS Sabino, GP De Sousa, C Luz-Lima, PTC Freire, FEA Melo, ... Solid state communications 149 (37-38), 1553-1556 , 2009 2009 Citations: 41
Understanding the effect of solvent polarity on the polymorphism of octadecanoic acid through spectroscopic techniques and DFT calculations LFL Silva, W Paschoal, GS Pinheiro, JG da Silva Filho, PTC Freire, ... CrystEngComm 21 (2), 297-309 , 2019 2019 Citations: 39
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Temperature-induced isostructural phase transition on NaCe (MoO4) 2 system: A Raman scattering study JVB Moura, C Luz-Lima, GS Pinheiro, PTC Freire Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 208, 229-235 , 2019 2019 Citations: 32
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Temperature-dependent Raman spectroscopy studies of phase transformations in the K2WO4 and the MgMoO4 crystals C Luz-Lima, JC Batista, PTC Freire, GP De Sousa, FEP Dos Santos, ... Vibrational Spectroscopy 65, 58-65 , 2013 2013 Citations: 32
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Low-temperature phase transformation studies in the stearic acid: C form FF De Sousa, PTC Freire, AS De Menezes, GS Pinheiro, LP Cardoso, ... Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 148, 280-288 , 2015 2015 Citations: 26
Strain and piezo-doping mismatch between graphene layers A Forestier, F Balima, C Bousige, GS Pinheiro, R Fulcrand, M Kalbáč, ... The Journal of Physical Chemistry C 124 (20), 11193-11199 , 2020 2020 Citations: 24
Low-Temperature Raman Spectra of l -Histidine Crystals GP De Sousa, PTC Freire, JM Filho, FEA Melo, CL Lima Brazilian Journal of Physics 43 (3), 137-144 , 2013 2013 Citations: 24
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Low‐temperature Raman spectra of racemate DL ‐Alanine crystals JA Lima Jr, PTC Freire, FEA Melo, JM Filho, GP De Sousa, RJC Lima, ... Journal of Raman Spectroscopy 41 (7), 808-813 , 2010 2010 Citations: 23
