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Zapata-Peñasco I, Avelino-Jiménez I, Mendoza-Pérez J, Vázquez Guevara M, Gutiérrez-Ladrón de Guevara M, Valadez- Martínez M, Hernández-Maya L, Garibay-Febles V, Fregoso-Aguilar T, Fonseca-Campos J. Environmental stressor assessment of hydrocarbonoclastic bacteria biofilms from a marine oil spill. BIOTECHNOLOGY REPORTS (AMSTERDAM, NETHERLANDS) 2024; 42:e00834. [PMID: 38948351 PMCID: PMC11211098 DOI: 10.1016/j.btre.2024.e00834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Revised: 03/04/2024] [Accepted: 03/07/2024] [Indexed: 07/02/2024]
Abstract
The environmental and economic impact of an oil spill can be significant. Biotechnologies applied during a marine oil spill involve bioaugmentation with immobilised or encapsulated indigenous hydrocarbonoclastic species selected under laboratory conditions to improve degradation rates. The environmental factors that act as stressors and impact the effectiveness of hydrocarbon removal are one of the challenges associated with these applications. Understanding how native microbes react to environmental stresses is necessary for effective bioaugmentation. Herein, Micrococcus luteus and M. yunnanensis isolated from a marine oil spill mooring system showed hydrocarbonoclastic activity on Maya crude oil in a short time by means of total petroleum hydrocarbons (TPH) at 144 h: M. luteus up to 98.79 % and M. yunnanensis 97.77 % removal. The assessment of Micrococcus biofilms at different temperature (30 °C and 50 °C), pH (5, 6, 7, 8, 9), salinity (30, 50, 60, 70, 80 g/L), and crude oil concentration (1, 5, 15, 25, 35 %) showed different response to the stressors depending on the strain. According to response surface analysis, the main effect was temperature > salinity > hydrocarbon concentration. The hydrocarbonoclastic biofilm architecture was characterised using scanning electron microscopy (SEM) and atomic force microscopy (AFM). Subtle but significant differences were observed: pili in M. luteus by SEM and the topographical differences measured by AFM Power Spectral Density (PSD) analysis, roughness was higher in M. luteus than in M. yunnanensis. In all three domains of life, the Universal Stress Protein (Usp) is crucial for stress adaptation. Herein, the uspA gene expression was analysed in Micrococcus biofilm under environmental stressors. The uspA expression increased up to 2.5-fold in M. luteus biofilms at 30 °C, and 1.3-fold at 50 °C. The highest uspA expression was recorded in M. yunnanensis biofilms at 50 °C with 2.5 and 3-fold with salinities of 50, 60, and 80 g/L at hydrocarbon concentrations of 15, 25, and 35 %. M. yunnanensis biofilms showed greater resilience than M. luteus biofilms when exposed to harsh environmental stressors. M. yunnanensis biofilms were thicker than M. luteus biofilms. Both biofilm responses to environmental stressors through uspA gene expression were consistent with the behaviours observed in the response surface analyses. The uspA gene is a suitable biomarker for assessing environmental stressors of potential microorganisms for bioremediation of marine oil spills and for biosensing the ecophysiological status of native microbiota in a marine petroleum environment.
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Affiliation(s)
- I. Zapata-Peñasco
- Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas Norte 152, Gustavo A. Madero, Ciudad de México, 07730, Mexico
| | - I.A. Avelino-Jiménez
- Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas Norte 152, Gustavo A. Madero, Ciudad de México, 07730, Mexico
| | - J. Mendoza-Pérez
- Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Av. Wilfrido Massieu 399, Nueva Industrial Vallejo, Gustavo A. Madero, 07738, Mexico
| | - M. Vázquez Guevara
- Facultad de Química, Universidad de Guanajuato, Noria Alta, Guanajuato, 36050, Mexico
| | - M. Gutiérrez-Ladrón de Guevara
- Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Av. Wilfrido Massieu 399, Nueva Industrial Vallejo, Gustavo A. Madero, 07738, Mexico
| | - M. Valadez- Martínez
- Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas Norte 152, Gustavo A. Madero, Ciudad de México, 07730, Mexico
| | - L. Hernández-Maya
- Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas Norte 152, Gustavo A. Madero, Ciudad de México, 07730, Mexico
| | - V. Garibay-Febles
- Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas Norte 152, Gustavo A. Madero, Ciudad de México, 07730, Mexico
| | - T. Fregoso-Aguilar
- Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Av. Wilfrido Massieu 399, Nueva Industrial Vallejo, Gustavo A. Madero, 07738, Mexico
| | - J. Fonseca-Campos
- Unidad Profesional Interdisciplinaria en Ingeniería y Tecnologías Avanzadas, Instituto Politécnico Nacional, Av Instituto Politécnico Nacional, Gustavo A. Madero, 07340, Mexico
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Matos RS, Pinto EP, Pires MA, Ramos GQ, Ţălu Ş, Lima LS, da Fonseca Filho HD. Evaluating the roughness dynamics of kefir biofilms grown on Amazon cupuaçu juice: a monofractal and multifractal approach. Microscopy (Oxf) 2024; 73:55-65. [PMID: 37540558 DOI: 10.1093/jmicro/dfad040] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Revised: 05/22/2023] [Accepted: 07/17/2023] [Indexed: 08/05/2023] Open
Abstract
We conducted a comprehensive analysis of the surface microtexture of kefir biofilms grown on Theobroma grandiflorum Shum (cupuaçu) juice using atomic force microscopy. Our goal was to investigate the unique monofractal and multifractal spatial patterns of these biofilms to complement the existing limited literature. The biofilms were prepared dispersing four different concentrations of kefir grains in cupuaçu juice. Our morphological analysis showed that the surface of the obtained biofilms is essentially formed by the presence of cupuaçu fibers and microorganisms like lactobacilli and yeast. The topographic height-based parameter analysis reveals that there is a dependence between surface roughness and the concentration of kefir grains used. The strongly anisotropic well-centralized topographical height distribution of the biofilms also exhibited a quasi-symmetrical and platykurtic pattern. The biofilms exhibit comparable levels of spatial complexity, surface percolation and surface homogeneity, which can be attributed to their similar topographic uniformity. This aspect was further supported by the presence of similar multifractality in the biofilms, suggesting that despite their varying topographic roughness, their vertical growth dynamics follow a similar pattern. Our findings demonstrate that the surface roughness of kefir biofilms cultivated on cupuaçu juice is influenced by the concentration of kefir grains in the precursor solution. However, this dependence follows a consistent pattern across different concentrations. Graphical Abstract.
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Affiliation(s)
- Robert S Matos
- Amazonian Materials Group, Department of Physics, Federal University of Amapá-UNIFAP, Rod. Juscelino Kubitscheck, km 02 - Jardim Marco Zero, Macapá, Amapá 68.903-419, Brazil
| | - Erveton P Pinto
- Amazonian Materials Group, Department of Physics, Federal University of Amapá-UNIFAP, Rod. Juscelino Kubitscheck, km 02 - Jardim Marco Zero, Macapá, Amapá 68.903-419, Brazil
| | - Marcelo A Pires
- Department of Physiscs, Federal University of Alagoas-UFAL, Rodovia AL 145, Km 3, 3849 - Cidade Universitária, Delmiro Gouveia, Alagoas 57.480-000, Brazil
| | - Glenda Q Ramos
- Centro Multiusuário para Análise de Fenômenos Biomédicos da Universidade do Estado do Amazonas, Universidade do Estado do Amazonas-UEA, Av. Carvalho Leal, 1777 - Cachoeirinha, Amazonas 69.065-001, Brazil
| | - Ştefan Ţălu
- Technical University of Cluj-Napoca, The Directorate of Research, Development and Innovation Management (DMCDI), Constantin Daicoviciu St., no. 15, Cluj-Napoca, Cluj County 400020, Romania
| | - Lucas S Lima
- Laboratory of Corrosion and Nanotechnology (LCNT), Federal University of Sergipe-UFS, Cidade Universitária Prof. "José Aloísio de Campos" Av. Marechal Rondom, S/N - Jardim Rosa Elze, São Cristovão, Sergipe 49.100-000, Brazil
| | - Henrique D da Fonseca Filho
- Laboratory of Synthesis of Nanomaterials and Nanoscopy, Department of Physics, Federal University of Amazonas-UFAM, Av. General Rodrigo Octavio Jordão Ramos, 1200 - Coroado I, Manaus, Amazonas 69.067-005, Brazil
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Li L, Zhang W, Wang J, Ruan X, Li L, Xie M. Multiscale characterization and contact performance analysis of machining surfaces. Sci Rep 2023; 13:9710. [PMID: 37322105 DOI: 10.1038/s41598-023-36907-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Accepted: 06/12/2023] [Indexed: 06/17/2023] Open
Abstract
Accurately characterizing the surface topography of parts is crucial to improve the surface measurement accuracy and analyze the surface contact performance. A method is proposed to separate the morphological characteristics of the actual machined surface based on the layer-by-layer error reconstruction method and the signal-to-noise ratio method during the wavelet transform process, so as to evaluate the contact performance of the different joint surfaces. First, the actual machined surface morphological features are separated by using the wavelet transform method, the layer-by-layer error reconstruction method, and the signal-to-noise ratio method. Second, the reconstructed three-dimensional surface contact model is established by the reverse modeling engineering method. Third, the finite element method is used to analyze the impact of processing methods and surface roughness on contact surface parameters. The result demonstrates that the simplified and efficient three-dimensional reconstructed surface is achieved based on the real machining surface in contrast to other existing approaches. The surface roughness has a more significant influence on contact performance. The contact deformation increases with the increase of surface roughness, while the curves of average contact stress, contact stiffness, and contact area have the opposite trend.
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Affiliation(s)
- Ling Li
- School of Mechanical and Electrical Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, Shaanxi, China
| | - Wang Zhang
- School of Mechanical and Electrical Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, Shaanxi, China
| | - Jingjing Wang
- School of Mechanical and Electrical Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, Shaanxi, China
| | - Xiaoguang Ruan
- School of Mechanical and Electrical Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, Shaanxi, China.
| | - Lixia Li
- School of Mechanical and Electrical Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, Shaanxi, China
| | - Miaoxia Xie
- School of Mechanical and Electrical Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, Shaanxi, China
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Dejam L, Sabbaghzadeh J, Ghaderi A, Solaymani S, Matos RS, Țălu Ș, da Fonseca Filho HD, Sari AH, Kiani H, Shayegan AHS, Doudaran MA. Advanced nano-texture, optical bandgap, and Urbach energy analysis of NiO/Si heterojunctions. Sci Rep 2023; 13:6518. [PMID: 37085689 PMCID: PMC10121669 DOI: 10.1038/s41598-023-33713-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2022] [Accepted: 04/18/2023] [Indexed: 04/23/2023] Open
Abstract
Due to the large number of industrial applications of transparent conductive oxides (TCOs), this study focuses on one of the most important metal oxides. The RF-magnetron sputtering method was used to fabricate NiO thin films on both quartz and silicon substrates at room temperature under flow of Argon and Oxygen. The sputtered samples were annealed in N2 atmosphere at 400, 500, and 600 °C for 2 hours. Using the AFM micrographs and WSXM 4.0 software, the basic surface parameters, including root mean square roughness, average roughness, kurtosis, skewness, etc., were computed. Advanced surface parameters were obtained by the Shannon entropy through a developed algorithm, and the power spectral density and fractal succolarity were extracted by related methods. Optical properties were studied using a transmittance spectrum to achieve the optical bandgap, absorption coefficient, Urbach energy, and other optical parameters. Photoluminescence properties also showed interesting results in accordance with optical properties. Finally, electrical characterizations and I-V measurements of the NiO/Si heterojunction device demonstrated that it can be used as a good diode device.
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Affiliation(s)
- Laya Dejam
- Quantum Technologies Research Center (QTRC), Science and Research Branch, Islamic Azad University, Tehran, Iran
- Physics Department, West Tehran Branch, Islamic Azad University, Tehran, Iran
| | - Jamshid Sabbaghzadeh
- Quantum Technologies Research Center (QTRC), Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Atefeh Ghaderi
- Quantum Technologies Research Center (QTRC), Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Shahram Solaymani
- Quantum Technologies Research Center (QTRC), Science and Research Branch, Islamic Azad University, Tehran, Iran.
| | - Robert S Matos
- Amazonian Materials Group, Physics Department, Federal University of Amapá-UNIFAP, Macapá, Amapá, Brazil
| | - Ștefan Țălu
- The Directorate of Research, Development and Innovation Management (DMCDI), Technical University of Cluj-Napoca, Cluj-Napoca, Cluj County, Romania
| | - Henrique D da Fonseca Filho
- Laboratory of Synthesis of Nanomaterials and Nanoscopy, Physics Department, Federal University of Amazonas-UFAM, Manaus, Amazonas, Brazil
| | - Amir Hossein Sari
- Quantum Technologies Research Center (QTRC), Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Hanieh Kiani
- Physics Department, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Amir Hossein Salehi Shayegan
- Quantum Technologies Research Center (QTRC), Science and Research Branch, Islamic Azad University, Tehran, Iran
- Mathematics Department, Faculty of Basic Science, Khatam-Ol-Anbia (PBU) University, Tehran, Iran
| | - Mahdi Astani Doudaran
- Quantum Technologies Research Center (QTRC), Science and Research Branch, Islamic Azad University, Tehran, Iran
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de Moraes Segundo JDDP, de Moraes MOS, Brito WR, Matos RS, Salerno M, Barcelay YR, Segala K, da Fonseca Filho HD, d’Ávila MA. Molecularly Imprinted Membrane Produced by Electrospinning for β-Caryophyllene Extraction. MATERIALS (BASEL, SWITZERLAND) 2022; 15:7275. [PMID: 36295339 PMCID: PMC9610809 DOI: 10.3390/ma15207275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 10/12/2022] [Accepted: 10/14/2022] [Indexed: 06/16/2023]
Abstract
Molecularly imprinted membrane of β-caryophyllene (MIM-βCP) was fabricated incorporating β-caryophyllene molecularly imprinted polymer nanoparticles (βCP-NP) into polycaprolactone (PCL) fibers via electrospinning. The βCP-NP were synthesized by precipitation polymerization using the βCP as a template molecule and acrylic acid as a functional monomer in the proportion of 1:4 mol, respectively. Atomic force microscopy images and X-ray diffraction confirmed the nanoparticles' incorporation into MIM-βCP. MIM-βCP functionalization was evaluated by gas chromatography. The binding capacity was 1.80 ± 0.05 μmol/cm2, and the selectivity test was performed with a mixing solution of βCP and caryophyllene oxide, as an analog compound, that extracted 77% of the βCP in 5 min. The electrospun MIM-βCP can be used to detect and extract the βCP, applications in the molecular sieve, and biosensor production and may also contribute as an initial methodology to enhance versatile applications in the future, such as in the treatment of skin diseases, filters for extraction, and detection of βCP to prevent counterfeiting of commercial products, and smart clothing with insect-repellent properties.
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Affiliation(s)
| | - Maria Oneide Silva de Moraes
- Department of Chemistry, Federal University of Amazonas, Manaus 69067-005, Brazil
- Thematic Laboratory of Microscopy and Nanotechnology, National Institute of Amazonian Research, Manaus 69067-001, Brazil
| | - Walter Ricardo Brito
- Department of Chemistry, Federal University of Amazonas, Manaus 69067-005, Brazil
| | - Robert S. Matos
- Postgraduate Program in Materials Science and Engineering, Federal University of Sergipe-UFS, São Cristóvão 49100-000, Brazil
| | - Marco Salerno
- Institute for Globally Distributed Open Research and Education (IGDORE), Institute for Materials Science, Max Bergmann Center of Biomaterials, Technische Universität Dresden, 01069 Dresden, Germany
| | - Yonny Romaguera Barcelay
- Department of Chemistry, Federal University of Amazonas, Manaus 69067-005, Brazil
- BioMark@UC/CEB–LABBELS, Faculty of Sciences and Technology, University of Coimbra, 3004-531 Coimbra, Portugal
| | - Karen Segala
- Department of Chemistry, Federal University of Amazonas, Manaus 69067-005, Brazil
| | - Henrique Duarte da Fonseca Filho
- Laboratory of Synthesis of Nanomaterials and Nanoscopy, Physics Department, Federal University of Amazonas-UFAM, Manaus 69067-005, Brazil
| | - Marcos Akira d’Ávila
- Department of Manufacturing and Materials Engineering, University of Campinas, Campinas 13083-860, Brazil
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do Amaral Amâncio M, Romaguera-Barcelay Y, Matos RS, Pires MA, Gandarilla AMD, do Nascimento MVB, Nobre FX, Ţălu Ş, da Fonseca Filho HD, Brito WR. Effect of the Deposition Time on the Structural, 3D Vertical Growth, and Electrical Conductivity Properties of Electrodeposited Anatase-Rutile Nanostructured Thin Films. MICROMACHINES 2022; 13:1361. [PMID: 36014283 PMCID: PMC9412731 DOI: 10.3390/mi13081361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Revised: 08/15/2022] [Accepted: 08/17/2022] [Indexed: 06/15/2023]
Abstract
TiO2 time-dependent electrodeposited thin films were synthesized using an electrophoretic apparatus. The XRD analysis revealed that the films could exhibit a crystalline structure composed of ~81% anatase and ~6% rutile after 10 s of deposition, with crystallite size of 15 nm. AFM 3D maps showed that the surfaces obtained between 2 and 10 s of deposition exhibit strong topographical irregularities with long-range and short-range correlations being observed in different surface regions, a trend also observed by the Minkowski functionals. The height-based ISO, as well as specific surface microtexture parameters, showed an overall decrease from 2 to 10 s of deposition, showing a subtle decrease in the vertical growth of the films. The surfaces were also mapped to have low spatial dominant frequencies, which is associated with the similar roughness profile of the films, despite the overall difference in vertical growth observed. The electrical conductivity measurements showed that despite the decrease in topographical roughness, the films acquired a thickness capable of making them increasingly insulating from 2 to 10 s of deposition. Thus, our results prove that the deposition time used during the electrophoretic experiment consistently affects the films' structure, morphology, and electrical conductivity.
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Affiliation(s)
| | | | - Robert Saraiva Matos
- Graduate Program in Materials Science and Engineering, Federal University of Sergipe-UFS, São Cristóvão 49100-000, SE, Brazil
| | | | | | | | - Francisco Xavier Nobre
- Federal Institute of Education, Science and Technology of Amazonas, Coari 69460-000, AM, Brazil
| | - Ştefan Ţălu
- Directorate of Research, Development and Innovation Management (DMCDI), Technical University of Cluj-Napoca, 15 Constantin Daicoviciu St., 400020 Cluj-Napoca, Romania
| | - Henrique Duarte da Fonseca Filho
- Laboratory of Nanomaterials Synthesis and Nanoscopy, Department of Physics, Federal University of Amazonas, Manaus 69067-005, AM, Brazil
| | - Walter Ricardo Brito
- Department of Chemistry, Federal University of Amazonas-UFAM, Manaus 69067-005, AM, Brazil
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Rocha ALF, de Aguiar Nunes RZ, Matos RS, da Fonseca Filho HD, de Araújo Bezerra J, Lima AR, Guimarães FEG, Pamplona AMSR, Majolo C, de Souza MG, Campelo PH, Ţălu Ş, Bagnato VS, Inada NM, Sanches EA. Alternative Controlling Agent of Theobroma grandiflorum Pests: Nanoscale Surface and Fractal Analysis of Gelatin/PCL Loaded Particles Containing Lippia origanoides Essential Oil. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:2712. [PMID: 35957144 PMCID: PMC9370742 DOI: 10.3390/nano12152712] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/16/2022] [Revised: 08/05/2022] [Accepted: 08/05/2022] [Indexed: 06/15/2023]
Abstract
A new systematic structural study was performed using the Atomic Force Microscopy (AFM) reporting statistical parameters of polymeric particles based on gelatin and poly-ε-caprolactone (PCL) containing essential oil from Lippia origanoides. The developed biocides are efficient alternative controlling agents of Conotrachelus humeropictus and Moniliophtora perniciosa, the main pests of Theobroma grandiflorum. Our results showed that the particles morphology can be successfully controlled by advanced stereometric parameters, pointing to an appropriate concentration of encapsulated essential oil according to the particle surface characteristics. For this reason, the absolute concentration of 1000 µg·mL-1 (P1000 system) was encapsulated, resulting in the most suitable surface microtexture, allowing a faster and more efficient essential oil release. Loaded particles presented zeta potential around (-54.3 ± 2.3) mV at pH = 8, and particle size distribution ranging from 113 to 442 nm. The hydrodynamic diameter of 90% of the particle population was found to be up to (405 ± 31) nm in the P1000 system. The essential oil release was evaluated up to 80 h, with maximum release concentrations of 63% and 95% for P500 and P1000, respectively. The best fit for the release profiles was obtained using the Korsmeyer-Peppas mathematical model. Loaded particles resulted in 100% mortality of C. humeropictus up to 48 h. The antifungal tests against M. perniciosa resulted in a minimum inhibitory concentration of 250 µg·mL-1, and the P1000 system produced growth inhibition up to 7 days. The developed system has potential as alternative controlling agent, due to its physical stability, particle surface microtexture, as well as pronounced bioactivity of the encapsulated essential oil.
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Affiliation(s)
- Ana Luisa Farias Rocha
- Laboratory of Nanostructured Polymers (NANOPOL), Federal University of Amazonas (UFAM), Manaus 69067-005, AM, Brazil
- Graduate Program in Materials Science and Engineering (PPGCEM), Federal University of Amazonas (UFAM), Manaus 69067-005, AM, Brazil
| | - Ronald Zico de Aguiar Nunes
- Laboratory of Nanostructured Polymers (NANOPOL), Federal University of Amazonas (UFAM), Manaus 69067-005, AM, Brazil
| | - Robert Saraiva Matos
- Amazonian Materials Group, Federal University of Amapá (UNIFAP), Macapá 68903-419, AP, Brazil
| | - Henrique Duarte da Fonseca Filho
- Graduate Program in Materials Science and Engineering (PPGCEM), Federal University of Amazonas (UFAM), Manaus 69067-005, AM, Brazil
- Laboratory of Nanomaterials Synthesis and Nanoscopy (LSNN), Federal University of Amazonas (UFAM), Manaus 69067-005, AM, Brazil
| | - Jaqueline de Araújo Bezerra
- Analytical Center, Federal Institute of Education, Science and Technology of Amazonas (IFAM), Manaus 69020-120, AM, Brazil
| | - Alessandra Ramos Lima
- São Carlos Institute of Physics (IFSC), University of São Paulo (USP), São Carlos 13563-120, SP, Brazil
| | | | | | - Cláudia Majolo
- EMBRAPA Western Amazon, Manaus AM-010 Km 29, Manaus 69010-970, AM, Brazil
| | | | - Pedro Henrique Campelo
- Department of Food Technology, Federal University of Viçosa (UFV), Viçosa 36570-900, MG, Brazil
| | - Ştefan Ţălu
- The Directorate of Research, Development and Innovation Management (DMCDI), Technical University of Cluj-Napoca, 15 Constantin Daicoviciu St., 400020 Cluj-Napoca, Cluj County, Romania
| | - Vanderlei Salvador Bagnato
- São Carlos Institute of Physics (IFSC), University of São Paulo (USP), São Carlos 13563-120, SP, Brazil
- Hagler Institute for Advanced Studies, Texas A&M University, College Station, TX 77843, USA
| | - Natalia Mayumi Inada
- São Carlos Institute of Physics (IFSC), University of São Paulo (USP), São Carlos 13563-120, SP, Brazil
| | - Edgar Aparecido Sanches
- Laboratory of Nanostructured Polymers (NANOPOL), Federal University of Amazonas (UFAM), Manaus 69067-005, AM, Brazil
- Graduate Program in Materials Science and Engineering (PPGCEM), Federal University of Amazonas (UFAM), Manaus 69067-005, AM, Brazil
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Abstract
The development and efficient production of effective bioplastics is a hot topic, required to face up to the issue of the difficult disposal of plastics derived from oil. Among the different natural sources of bioplastics, starch is one of the most promising. However, for most applications, the proper mastering of the surface properties of bioplastic is necessary. We report about the surface modification of extruded corn starch films by means of cold plasma based on helium (He) and hexamethyldisiloxane (HMDSO). The differently treated surfaces were functionally characterized in wettability and water absorption. The nanoscale morphology was assessed by scanning electron microscopy and atomic force microscopy. The obtained images were analyzed by advanced figures describing both texture and amplitude parameters, including fractal behavior. The combined treatment (He/HMDSO) resulted in more homogeneous films with smaller, better-distributed grains compared to the case wherein He was not used. Despite the different morphologies observed, starch coated by HMDSO alone and by He/HMDSO presented similar hydrophobic character, with contact angles higher than 110°. Plasma treatment with HMDSO and He/HMDSO resulted in a significant reduction of absorbed water content without reduction of water vapor permeability. The nanotexture of the films did not present statistically significant differences, in terms of spatial complexities, dominant spatial frequencies, homogeneous void distribution, and surface percolation.
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Advanced microstructure, morphology and CO gas sensor properties of Cu/Ni bilayers at nanoscale. Sci Rep 2022; 12:12002. [PMID: 35835814 PMCID: PMC9283587 DOI: 10.1038/s41598-022-16347-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Accepted: 07/08/2022] [Indexed: 11/16/2022] Open
Abstract
In this study, we investigated the morphology of synthesized Cu/Ni nanoparticles in trace of carbon sources by the co-deposition process of RF sputtering and RF-PECVD methods and localized surface plasmon resonance of CO gas sensing of Cu/Ni nanoparticles. The surface morphology was studied by analyzing 3D micrographs of atomic force microscopy using image processing techniques and fractal/multifractal analyses. The MountainsMap® Premium software with the two-way ANOVA (Variance analysis) and least-significant differences tests were used for statistical analysis. The surface nano-patterns have a local and global particular distribution. Experimental and simulated Rutherford backscattering spectra confirm the quality of nanoparticles. Then, prepared samples were exposed to CO gas flue to study their gas sensor application using the localized surface plasmon resonance method. Increasing the Ni layer over Cu one shows an interesting result in both morphology and gas sensing sides. Advanced stereometric analyses for the surface topography of thin films in conjunction with Rutherford backscattering spectrometry and Spectroscopic analysis make a unique study in the field.
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de Oliveira LM, Matos RS, Ţălu Ş, Rocha ALF, de Aguiar Nunes RZ, Bezerra JDA, Campelo Felix PH, Inada NM, Sanches EA, da Fonseca Filho HD. Three-Dimensional Nanoscale Morphological Surface Analysis of Polymeric Particles Containing Allium sativum Essential Oil. MATERIALS 2022; 15:ma15072635. [PMID: 35407970 PMCID: PMC9000302 DOI: 10.3390/ma15072635] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Revised: 03/22/2022] [Accepted: 03/31/2022] [Indexed: 02/07/2023]
Abstract
Biodegradable particles were developed using poly-ε-caprolactone and gelatin carriers containing different concentrations of Allium sativum essential oil (EO) (360 µg/mL, 420 µg/mL, and 460 µg/mL). Atomic force microscopy was useful to evaluate the particles' surface based on morphological parameters. The particles' size varied from 150 nm to 300 nm. The diameter was related to the increase of the particles' height as a function of the EO concentration, influencing the roughness of the surface core values (from 20 to 30 nm) and surface irregularity. The spatial parameters Str (texture aspect ratio) and Std (texture direction) revealed low spatial frequency components. The hybrid parameters Sdq (root mean square gradient) and Sdr (interfacial area ratio) also increased as a function of the EO concentration, revealing fewer flat particles. On the other hand, the functional parameters (inverse areal material ratio and peak extreme height) suggested differences in surface irregularities. Higher concentrations of EO resulted in greater microtexture asperity on the particles' surface, as well as sharper peaks. The nanoscale morphological surface analysis allowed the determination of the most appropriate concentration of encapsulated EO, influencing statistical surface parameters.
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Affiliation(s)
- Larissa Medeiros de Oliveira
- Laboratory of Nanostructured Polymers (NANOPOL—@nanopol_ufam), Department of Physics, Federal University of Amazonas (UFAM), Manaus 69067-005, AM, Brazil; (L.M.d.O.); (A.L.F.R.); (R.Z.d.A.N.); (E.A.S.)
| | - Robert Saraiva Matos
- Amazonian Materials Group, Department of Physics, Federal University of Amapá (UNIFAP), Macapá 68903-419, AP, Brazil;
- Graduate Program in Materials Science and Engineering, Department of Materials Science and Engineering, Federal University of Sergipe (UFS), São Cristóvão 49100-000, SE, Brazil
| | - Ştefan Ţălu
- The Directorate of Research, Development and Innovation Management (DMCDI), Technical University of Cluj-Napoca, 15 Constantin Daicoviciu St., 400020 Cluj-Napoca, Romania
- Correspondence: or (Ş.Ţ.); (H.D.d.F.F.)
| | - Ana Luisa Farias Rocha
- Laboratory of Nanostructured Polymers (NANOPOL—@nanopol_ufam), Department of Physics, Federal University of Amazonas (UFAM), Manaus 69067-005, AM, Brazil; (L.M.d.O.); (A.L.F.R.); (R.Z.d.A.N.); (E.A.S.)
| | - Ronald Zico de Aguiar Nunes
- Laboratory of Nanostructured Polymers (NANOPOL—@nanopol_ufam), Department of Physics, Federal University of Amazonas (UFAM), Manaus 69067-005, AM, Brazil; (L.M.d.O.); (A.L.F.R.); (R.Z.d.A.N.); (E.A.S.)
| | - Jaqueline de Araújo Bezerra
- Federal Institute of Education, Science and Technology of Amazonas (IFAM), IFAM Analytical Center, Manaus Centro Campus, Manaus 69067-005, AM, Brazil;
| | | | - Natália Mayumi Inada
- São Carlos Institute of Physics (IFSC), University of São Paulo (USP), São Carlos 13566-590, SP, Brazil;
| | - Edgar Aparecido Sanches
- Laboratory of Nanostructured Polymers (NANOPOL—@nanopol_ufam), Department of Physics, Federal University of Amazonas (UFAM), Manaus 69067-005, AM, Brazil; (L.M.d.O.); (A.L.F.R.); (R.Z.d.A.N.); (E.A.S.)
| | - Henrique Duarte da Fonseca Filho
- Laboratory of Synthesis of Nanomaterials and Nanoscopy (LSNN), Department of Physics, Federal University of Amazonas (UFAM), Manaus 69067-005, AM, Brazil
- Correspondence: or (Ş.Ţ.); (H.D.d.F.F.)
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Matos RS, da Fonseca Filho HD, Das A, Kumar S, Chawla V, Ţălu Ş. Stereometric analysis of Ti 1- x Al x N thin films deposited by direct current/radio frequency magnetron sputtering. Microsc Res Tech 2022; 85:296-307. [PMID: 34390538 DOI: 10.1002/jemt.23905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Revised: 07/30/2021] [Accepted: 07/31/2021] [Indexed: 02/05/2023]
Abstract
A study of image analysis of Ti1-x Alx N films deposited on corning glass substrates by a direct current (DC)/radio frequency (RF) magnetron sputtering system was performed. Atomic force microscopy (AFM) data were studied to understand how the impact of the concentration of Al content influences the 3D surface morphology as well as the surface texture parameters. The results showed that the superficial morphology was modified by the increase of Al content in the Ti1-x Alx N films, as well as the surface microtexture. It has also been observed that the Ti1-x Alx N film surface with the highest aluminum (Al) doping concentration presented a similar surface morphology to pristine titanium nitride (TiN) thin films. The Abbott-Firestone curves for all films exhibited an S-like shape suggesting topographic uniformity and Gaussian distribution of heights. An increase in surface uniformity is observed with Al concentration. The characterization of the surface morphology of Ti1-x Alx N films by the evaluation of surface statistical parameters suggests that the surface topography can be adjusted by suitable doping of aluminum and offers a deeper understanding of the applicability of these films.
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Affiliation(s)
- Robert Saraiva Matos
- Postgraduate Program in Materials Science and Engineering, Federal University of Sergipe-UFS, São Cristóvão, Sergipe, Brazil
- Amazonian Materials Group, Physics Department, Federal University of Amapá-UNIFAP, Macapá, Amapá, Brazil
| | - Henrique Duarte da Fonseca Filho
- Laboratory of Synthesis of Nanomaterials and Nanoscopy, Physics Department, Federal University of Amazonas-UFAM, Manaus, Amazonas, Brazil
| | - Abhijeet Das
- Department of Physics, Centre of Advance Research, Rajiv Gandhi University, Doimukh, Arunachal Pradesh, India
| | - Sanjeev Kumar
- Department of Physics, Centre of Advance Research, Rajiv Gandhi University, Doimukh, Arunachal Pradesh, India
| | - Vipin Chawla
- Institute Instrumentation Centre, Indian Institute of Roorkee, Roorkee, Uttarakhand, India
| | - Ştefan Ţălu
- The Directorate of Research, Development and Innovation Management (DMCDI), Technical University of Cluj-Napoca, Cluj-Napoca, Cluj County, Romania
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da Fonseca Filho HD, Pires MP, de Souza PL, Matos RS, Prioli R. Investigation of the morphological and fractal behavior at nanoscale of patterning lines by scratching in an atomic force microscope. Microsc Res Tech 2021; 85:1046-1055. [PMID: 34723417 DOI: 10.1002/jemt.23974] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 08/05/2021] [Accepted: 10/22/2021] [Indexed: 11/06/2022]
Abstract
In this work, the topographical effect of the scratching trajectory and the feed direction on the formation of lithographed lines on the (001) InP surface was investigated using an atomic force microscope (AFM) tip-based nanomachining approach. Nanoscratching tests were carried out using the sharp face of a diamond AFM tip in contact mode. From the topographic maps obtained by AFM, several morphological and fractal parameters were obtained and analyzed. Surface morphology presented a surface smoothing for surfaces with scratches produced in [011] and [001] directions. The height parameters confirmed this behavior because scratches in [001] direction exhibited lower roughness. Moreover, this scratch direction promoted the height distribution most symmetrical and platykurtic. The other morphological parameters revealed that this direction provided a more irregular surface (smaller Smc and Sxp ), peak distribution, denser and pointed, smaller portion of material in the core, less deep furrows, higher spatial frequency components, and high isotropy. Fractal parameters revealed that FRE90 has the highest spatial complexity, it is dominated by higher spatial frequencies, and has the lowest surface percolation. Furthermore, all samples exhibited high topographic uniformity.
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Affiliation(s)
| | | | - Patrícia Lustoza de Souza
- Laboratório de Semicondutores, Centro de Estudos em Telecomunicações, Pontifícia Universidade Católica do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Robert Saraiva Matos
- Physics Department, Amazonian Materials Group, Laboratory of Materials, Federal University of Amapá-UNIFAP, Macapá, Brazil
| | - Rodrigo Prioli
- Departamento de Física, Pontifícia Universidade Católica do Rio de Janeiro, Rio de Janeiro, Brazil
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da Conceição WS, Ţălu Ş, Matos RS, Ramos GQ, Zayas FG, da Fonseca Filho HD. Stereometric characterization of Dinizia excelsa Ducke wood from Amazon rainforest using atomic force microscopy. Microsc Res Tech 2021; 84:1431-1441. [PMID: 33470508 DOI: 10.1002/jemt.23699] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Revised: 12/29/2020] [Accepted: 01/02/2021] [Indexed: 02/05/2023]
Abstract
Dinizia excelsa Ducke under three different cut conditions were carefully analyzed. The morphology and stereometry of different wood cutting surfaces (longitudinal radial, longitudinal tangential, and transversal) were studied by SEM and AFM. The results obtained in this study suggest that both the height parameters and the advanced stereometric parameters of the surfaces did not reveal a significant difference, indicating that the spatial patterns do not change according to the type of cut. In this way, the surface microtexture does not vary depending on the cut type. Similarly, the Hurst's coefficients did not show any significant difference in the spectrum of the PSD fractal region. On the other hand, Minkowski functionals presented a morphological difference between the samples. These results showed that the microtexture of the wood surface does not change as a function of the type of cut submitted to the same polishing process.
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Affiliation(s)
- Willian Silva da Conceição
- Laboratory of Synthesis of Nanomaterials and Nanoscopy, Physics Department, Federal University of Amazonas-UFAM, Manaus, Amazonas, Brazil
| | - Ştefan Ţălu
- The Directorate of Research, Development and Innovation Management (DMCDI), Technical University of Cluj-Napoca, Cluj-Napoca, Cluj county, Romania
| | - Robert Saraiva Matos
- Postgraduate Program in Materials Science and Engineering, Federal University of Sergipe-UFS, São Cristóvão, Sergipe, Brazil
- Amazonian Materials Group, Physics Department, Federal University of Amapá-UNIFAP, Macapá, Amapá, Brazil
| | - Glenda Quaresma Ramos
- Postgraduate Program in Tropical Medicine, Fundação de Medicina Tropical, State University of Amazonas, Manaus, Amazonas, Brazil
| | - Fidel Guereiro Zayas
- Laboratory of Synthesis of Nanomaterials and Nanoscopy, Physics Department, Federal University of Amazonas-UFAM, Manaus, Amazonas, Brazil
| | - Henrique Duarte da Fonseca Filho
- Laboratory of Synthesis of Nanomaterials and Nanoscopy, Physics Department, Federal University of Amazonas-UFAM, Manaus, Amazonas, Brazil
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Correlating Structure and Morphology of Andiroba Leaf (Carapa guianensis Aubl.) by Microscopy and Fractal Theory Analyses. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11135848] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The Amazon rainforest is considered a megadiverse biome, where several species of its rich flora are still unknown. The anatomy of their leaves usually identifies species. In this paper, we present a complete characterization of the leaf surface of Amazon Carapa guianensis Aubl. (Andiroba), using microscopy and fractal theory to be considered a possible tool for investigating different leaves spatial patterns, especially in species with similar leaf architecture. The SEM results revealed the cellular structures and other non-cellular structures that make up the leaf architecture, both for the abaxial and adaxial sides. The cells responsible for the plant photosynthesis process were observed in the internal structure of the leaf. The wettability analysis showed that the abaxial side is more hydrophobic, while the adaxial side is more hydrophilic. AFM images exposed the relevant details of the microstructure of the leaf abaxial side, such as stomata, pores, furrows, contour, particles, and rough profiles generated by topographic irregularities. The statistical parameters revealed that the scale size influences the topographic roughness, surface asymmetry, and shape of the height distribution, also observed by advanced parameters obtained according to the standard of the international organization for standardization (ISO). The fractal and advanced fractal parameters confirmed changes in spatial patterns as a function of scale size. The largest area exhibited greater spatial complexity, low dominant spatial frequencies, more excellent surface percolation, intermediate topographic homogeneity, and high uniformity of spatial patterns.
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da Costa ÍC, Matos RS, de Azevedo SG, Costa CAR, Sanches EA, da Fonseca Filho HD. Microscopy-based infrared spectroscopy as a tool to evaluate the influence of essential oil on the surface of loaded bilayered-nanoparticles. NANOTECHNOLOGY 2021; 32:345703. [PMID: 34081026 DOI: 10.1088/1361-6528/ac027e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Accepted: 05/18/2021] [Indexed: 06/12/2023]
Abstract
Increasing interest in nanoparticles of technological application has been improving their fabrication processes. The encapsulation of essential oils as bioactive compounds has proved to be an excellent alternative to the use of less environment friendly compounds. However, the difficulty of identifying their constitution and interaction with carrier agents have aroused scientific interest and a problem to overcome. Bilayer-based nanoparticles were developed using gelatin and poly-ε-caprolactone (PCL) aiming the encapsulation ofPiper nigrumessential oil. based on atomic force microscopy images and dynamic light scattering analysis, the size of the unloaded and loaded nanoparticles was found around (194 ± 40) and (296 ± 54) nm, respectively. The spatial patterns revealed that the surface of nanoparticles presented different surface roughness, similar shapes and height distribution asymmetry, lower dominant spatial frequencies, and different spatial complexity. Traditional infrared spectroscopy allowed the identification of the nanoparticle outermost layer formed by the gelatin carrier, but microscopy-based infrared spectroscopy revealed a band at 1742 cm-1related to the carbonyl stretching mode of PCL, as well as a band at 1557 cm-1due to the amide II group from gelatin. The combination of microscopy and spectroscopy techniques proved to be an efficient alternative to quickly identify differences in chemical composition by evaluating different functional groups in bilayer PLC/gelatin nanoparticles of technological application.
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Affiliation(s)
- Ítalo Carvalho da Costa
- Programa de Pós-graduação em Ciência e Engenharia de Materiais (PPGCEM), Universidade Federal do Amazonas (UFAM), Manaus, Amazonas, Brasil
- Laboratório de Síntese de Nanomateriais e Nanoscopia (LSNN), Universidade Federal do Amazonas (UFAM), Manaus, Amazonas, Brasil
| | - Robert Saraiva Matos
- Universidade Federal do Amapá (UNIFAP), Amazonian Materials Group, Departamento de Física, Macapá, Amapá, Brasil
| | - Sidney Gomes de Azevedo
- Laboratório de Polímeros Nanoestruturados (NANOPOL - @nanopol_ufam), Universidade Federal do Amazonas (UFAM), Manaus, Amazonas, Brasil
| | - Carlos Alberto Rodrigues Costa
- Laboratório Nacional de Nanotecnologia (LNNano), Centro Brasileiro de Pesquisa em Energia e Materiais (CNPEM), Campinas, São Paulo, Brasil
| | - Edgar Aparecido Sanches
- Programa de Pós-graduação em Ciência e Engenharia de Materiais (PPGCEM), Universidade Federal do Amazonas (UFAM), Manaus, Amazonas, Brasil
- Universidade Federal do Amapá (UNIFAP), Amazonian Materials Group, Departamento de Física, Macapá, Amapá, Brasil
| | - Henrique Duarte da Fonseca Filho
- Programa de Pós-graduação em Ciência e Engenharia de Materiais (PPGCEM), Universidade Federal do Amazonas (UFAM), Manaus, Amazonas, Brasil
- Laboratório de Síntese de Nanomateriais e Nanoscopia (LSNN), Universidade Federal do Amazonas (UFAM), Manaus, Amazonas, Brasil
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Investigation of Stereometric and Fractal Patterns of Spin-Coated LuMnO3 Thin Films. ADVANCES IN MATERIALS SCIENCE AND ENGINEERING 2021. [DOI: 10.1155/2021/9912247] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
In this paper, we have performed qualitative and quantitative analysis of LuMnO3 thin films surfaces, deposited by spin coating over Pt(111)/TiO2/SiO2/Si substrates, to evaluate their spatial patterns as a function of the film’s sintering temperature. Atomic force microscopy was employed to obtain topographic maps that were extensively analyzed via image processing techniques and mathematical tools. 3D (three-dimensional) topographical images revealed that films sintered at 650°C and 750°C presented the formation of smoother surfaces, while the film sintered at 850°C displayed a rougher surface with a root mean square roughness of ∼2.5 nm. On the other direction, the height distribution of the surface for all films has similar asymmetries and shape, although the film sintered using the highest temperature showed the lower density of rough peaks and a sharper peak shape. The advanced fractal parameters revealed that the film sintered at 850°C is dominated by low spatial frequencies, showing less spatial complexity, higher microtexture homogeneity, and uniform height distribution. These results suggest that the combination of stereometric and fractal parameters can be especially useful for identification of unique topographic spatial patterns in LuMnO3 thin films, helping in their implementation in technological applications, such as photovoltaic solar cells and information magnetic date storage and spintronic devices.
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Fractal-Stereometric Correlation of Nanoscale Spatial Patterns of GdMnO3 Thin Films Deposited by Spin Coating. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11093886] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Multiferroic systems are of great interest for technological applications. To improve the fabrication of thin films, stereometric and fractal analysis of surface morphology have been extensively performed to understand the influence of physical parameters on the quality of spatial patterns. In this work, GaMnO3 was synthesized and thin films were deposited on Pt(111)/TiO2/SiO2/Si substrates using a spin coating apparatus to study the correlation between their stereometric and fractal parameters. All films were studied by X-ray diffraction (XRD), where the structure and microstructure of the film sintered at 850 °C was investigated by Rietveld refinement. Topographic maps of the films were obtained using an atomic force microscope (AFM) in tapping mode. The results show that the film sintered at 850 °C exhibited a clear formation of a GdMnO3 orthorhombic structure with crystallite size of ~14 nm and a microstrain higher than other values reported in the literature. Its surface morphology presented a rougher topography, which was confirmed by the height parameters. Topographic differences due to different asymmetries and shapes of the height distributions between the films were observed. Specific stereometric parameters also showed differences in the morphology and microtexture of the films. Qualitative rendering obtained by commercial image processing software revealed substantial differences between the microtextures of the films. Fractal and advanced fractal parameters showed that the film sintered at 850 °C had greater spatial complexity, which was due to their higher topographic roughness, lower surface percolation and greater topographic uniformity, being dominated by low dominant special frequencies. Our combination of stereometric and fractal measurements can be useful to improve the fabrication process by optimizing spatial patterns as a function of the sintering temperature of the film.
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Amâncio MA, Pinto EP, Matos RS, Nobre FX, Brito WR, da Fonseca Filho HD. Nanoscale morphology and fractal analysis of TiO
2
coatings on ITO substrate by electrodeposition. J Microsc 2021; 282:162-174. [DOI: 10.1111/jmi.12990] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Revised: 11/22/2020] [Accepted: 11/25/2020] [Indexed: 12/14/2022]
Affiliation(s)
| | | | - Robert Saraiva Matos
- Department of Physics Federal University of Amapá Macapá Amapá Brazil
- Department of Materials Science and Engineering Federal University of Sergipe São Cristóvão Sergipe Brazil
| | - Francisco Xavier Nobre
- Department of Chemistry Federal University of Amazonas Manaus Amazonas Brazil
- Instituto Federal de Educação Ciência e Tecnologia do Amazonas Coari Amazonas Brazil
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Ramos GQ, da Costa ÍC, Maia da Costa MEH, Pinto EP, Matos RS, da Fonseca Filho HD. Stereometric analysis of Amazon rainforest Anacardium occidentale L. leaves. PLANTA 2021; 253:6. [PMID: 33387077 DOI: 10.1007/s00425-020-03529-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Accepted: 12/06/2020] [Indexed: 06/12/2023]
Abstract
AFM, profilometry and SEM measurements on both sides of the Anacardium occidentale L. leaf reveal that ultrastructure presented some singularities due to their different morphologies and roughness. The advanced stereometry and power spectrum density of both sides of the Anacardium occidentale L. leaf were carefully studied. We use three different microscopy techniques such as scanning electron microscopy, profilometry, and atomic force microscopy for a complete description of the leaf surface morphology. The morphology of the adaxial and abaxial sides revealed a surface composed of striated cuticles and stomata cells, respectively. The height parameters obtained by profilometry revealed that the abaxial side was rougher. However, both sides presented similar Gaussian height distribution and asymmetry. The advanced stereometric parameters obtained by the topographic maps of AFM revealed that the two sides have some singularities due to their different morphologies and roughness, but with similar microtextures. However, average PSD spectra showed that adaxial and abaxial sides are dominated by relatively low and high spatial frequencies, showing that the microtextures, unlike what was shown in stereometric parameters, are different. These results revealed that leaves surface morphology under different aspects and scales and the quantitative parameters confirmed the different spatial patterns displayed, which can be of great interest for the study of the biological behavior of plants from their leaves.
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Affiliation(s)
- Glenda Q Ramos
- Postgraduate Program in Tropical Medicine, Fundação de Medicina Tropical, State University of Amazonas, Manaus, AM, Brazil
| | - Ítalo C da Costa
- Laboratory of Synthesis of Nanomaterials and Nanoscopy, Physics Department, Federal University of Amazonas-UFAM, Manaus, Amazonas, Brazil
| | | | - Erveton P Pinto
- Amazonian Materials Group, Physics Department, Federal University of Amapá-UNIFAP, Macapá, Amapá, Brazil
| | - Robert S Matos
- Amazonian Materials Group, Physics Department, Federal University of Amapá-UNIFAP, Macapá, Amapá, Brazil
- Federal University of Sergipe-UFS, Postgraduate Program in Materials Science and Engineering, São Cristóvão, Sergipe, Brazil
| | - Henrique D da Fonseca Filho
- Laboratory of Synthesis of Nanomaterials and Nanoscopy, Physics Department, Federal University of Amazonas-UFAM, Manaus, Amazonas, Brazil.
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Matos RS, Pinheiro BS, Souza IS, Paes de Castro RR, Ramos GQ, Pinto EP, Silva RS, da Fonseca Filho HD. 3D micromorphology evaluation of kefir microbial films loaded with extract of Amazon rainforest fruit Cupuaçu. Micron 2020; 142:102996. [PMID: 33360436 DOI: 10.1016/j.micron.2020.102996] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Revised: 11/27/2020] [Accepted: 12/07/2020] [Indexed: 02/07/2023]
Abstract
We performed qualitative and quantitative analysis of surfaces of kefir biofilms loaded with Amazon rainforest fruit extract. Scanning electron microscopy and atomic force microscopy were used to evaluate the micromorphology of the biofilms. The films surface displayed a lower density of microorganisms (∼ 0.061 microorganisms/μm2) for the lowest concentration of fruit extract, however, a greater density (∼0.220 microorganisms/μm2) was observed for the higher concentration. Height stereometric parameters revealed that the biofilms with the highest concentration presented the highest roughness. However, almost all the stereometric parameters related to texture showed no significant difference. Furthermore, the Hurst coefficients of the average power spectrum density were similar for all biofilms. Fractal parameters confirmed that higher concentrations of fruit extract induced a superior topographic irregularity. However, fractal lacunarity does not show any significant difference confirming the similarity of the microtextures. Moreover, fractal succolarity and surface entropy exhibited values that suggested ideal percolation and strong topographic uniformity, respectively, indicating that these films can uniformly adhere to other surfaces. Our results confirm that the stereometric and fractal parameters can be relevant for the surface characterization of microbial films, which can be of great importance to the biomedical field.
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Affiliation(s)
- Robert S Matos
- Federal University of Sergipe-UFS, Postgraduate Program in Materials Science and Engineering, São Cristóvão, Sergipe, Brazil; Federal University of Amapá-UNIFAP, Amazonian Materials Group, Physics Department, Macapá, Amapá, Brazil
| | - Bianca S Pinheiro
- Federal University of Sergipe-UFS, Postgraduate Program in Materials Science and Engineering, São Cristóvão, Sergipe, Brazil
| | - Izabella S Souza
- Federal University of Amapá-UNIFAP, Amazonian Materials Group, Physics Department, Macapá, Amapá, Brazil
| | - Ruy R Paes de Castro
- Federal University of Amazonas-UFAM, Laboratory of Synthesis of Nanomaterials and Nanoscopy, Physics Department, Manaus, Amazonas, Brazil
| | - Glenda Q Ramos
- Postgraduate Program in Tropical Medicine, Fundação de Medicina Tropical, State University of Amazonas, 69040-000, Manaus, AM, Brazil
| | - Erveton P Pinto
- Federal University of Amapá-UNIFAP, Amazonian Materials Group, Physics Department, Macapá, Amapá, Brazil
| | - Romualdo S Silva
- Federal University of Sergipe-UFS, Postgraduate Program in Physics, São Cristóvão, Sergipe, Brazil
| | - Henrique D da Fonseca Filho
- Federal University of Amazonas-UFAM, Laboratory of Synthesis of Nanomaterials and Nanoscopy, Physics Department, Manaus, Amazonas, Brazil.
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Ţălu Ş, Matos RS, Pinto EP, Rezaee S, Mardani M. Stereometric and fractal analysis of sputtered Ag-Cu thin films. SURFACES AND INTERFACES 2020. [DOI: 10.1016/j.surfin.2020.100650] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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22
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Ito RM, de Souza CC, Gandarilla AMD, de Oliveira LM, Brito WR, Sanches EA, Matos RS, da Fonseca Filho HD. Micromorphology and microtexture evaluation of poly(o-ethoxyaniline) films using atomic force microscopy and fractal analysis. JOURNAL OF POLYMER RESEARCH 2020. [DOI: 10.1007/s10965-020-02262-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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