Advanced micromorphology study of microbial films grown on Kefir loaded with Açaí extract

Matos, Robert Saraiva; Ramos, Glenda Quaresma; Filho, Henrique Duarte da Fonseca; Ţălu, Ştefan

doi:10.1016/j.micron.2020.102912

Cited by 32 publications

(21 citation statements)

References 47 publications

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“…For the film surface, it is assumed that there is fluid entering the upper band of the surface, and the channels composed of similar points can assist fluid to the lower band. Penetration into the inner layer through such a process is the phenomenon of percolation [65,66]. Fractal lacunarity quantifies the distribution of gaps in space as a function of scale [67].…”

Section: Surface Growth and Factorsmentioning

confidence: 99%

Fractal Analysis on Surface Topography of Thin Films: A Review

et al. 2022

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The topographies of various surfaces have been studied in many fields due to the significant influence that surfaces have on the practical performance of a given sample. A comprehensive evaluation requires the assistance of fractal analysis, which is of significant importance for modern science and technology. Due to the deep insights of fractal theory, fractal analysis on surface topographies has been widely applied and recommended. In this paper, the remarkable uprising in recent decades of fractal analysis on the surfaces of thin films, an essential domain of surface engineering, is reviewed. By summarizing the methods used to calculate fractal dimension and the deposition techniques of thin films, the results and trends of fractal analysis are associated with the microstructure, deposition parameters, etc. and this contributes profoundly to exploring the mechanism of film growth under different conditions. Choosing appropriate methods of surface characterization and calculation methods to study diverse surfaces is the main challenge of current research on thin film surface topography by using fractal theory. Prospective developing trends are proposed based on the data extraction and statistics of the published literature in this field.

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Section: Surface Growth and Factorsmentioning

confidence: 99%

Fractal Analysis on Surface Topography of Thin Films: A Review

et al. 2022

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“…The fractal succolarity (FS) measures the degree of fluid penetration of a surface that can be estimated by the box-counting algorithm. In the present work, we have calculated FS using eq , where P 0 ( n ) is the number of boxes/line, P r ( k ) is the abscissa of the pressure centroid related to each box that occupies the image, and P 0 ( k ) is the number of occupied boxes/line. , Similar to Melo and Conci, we use boxes of 1 pixel × 1 pixel covering the image. The fluid inlet direction is considered from top to bottom, where the centroid pressure is positioned at the central point of the boxes: …”

Section: Computational Details: Advanced Fractal Parametersmentioning

confidence: 99%

Effect of Fe Doping on the Surface Morphology and Supercapacitor Properties of Sr(OH)₂ Thin Films: A Fractal Approach

Yadav

Priya

et al. 2021

J. Phys. Chem. C

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Fractal concepts have been employed to explore the morphological evolution of Sr(OH) 2 thin films prepared by the successive ionic layer adsorption and reaction (SILAR) method on stainless steel (SS) substrate. The surface morphology of each sample was captured using atomic force microscopy (AFM). Interface width, lateral correlation length, and roughness exponent were computed. Our study reveals that as doping is increased, the roughness exponent decreases and the fractal dimension increases. In all cases, the value of the roughness exponent was found to be greater than 0.5, indicating that the height fluctuations at neighboring pixels are correlated positively and exhibit persistent behavior and memory effect. Advanced fractal parameters such as lacunarity coefficient (σ), Hurst coefficient (HC), fractal succolarity (FS), and surface entropy (SE) are also calculated. Our study reveals that the surface entropy does not show any significant change, indicating a globally uniform surface. Furthermore, the local surface slope is found to play a crucial role in the performance of supercapacitive electrodes. Fractal analysis indicates that electrodes with larger fractal dimension are better for supercapacitor applications. These observations are corroborated with the 0.5 atom % Fe/Sr(OH) 2 doped sample. This sample exhibits both the highest fractal dimension and a specific capacity of 776 C g −1 at a scan rate of 5 mV s −1 . The materials with higher fractal dimension could thus be a strong candidate for the fabrication of highly efficient supercapacitors.

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“…The development of controlled release systems requires a systematic understanding of the particles’ surface. The atomic force microscopy (AFM) technique has been extensively applied to evaluate complex surfaces [ 20 , 21 , 22 , 23 ], providing information on morphological [ 24 , 25 , 26 , 27 ] and fractal [ 28 , 29 , 30 ] parameters, as well as a power spectrum density (PSD) [ 31 , 32 , 33 , 34 ]. These parameters allow the proposition of specific applications associated with the release mechanism of encapsulated compounds [ 35 ].…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Nanoscale Morphological Surface Analysis of Polymeric Particles Containing Allium sativum Essential Oil

et al. 2022

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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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Advanced micromorphology study of microbial films grown on Kefir loaded with Açaí extract

Cited by 32 publications

References 47 publications

Fractal Analysis on Surface Topography of Thin Films: A Review

Fractal Analysis on Surface Topography of Thin Films: A Review

Effect of Fe Doping on the Surface Morphology and Supercapacitor Properties of Sr(OH)₂ Thin Films: A Fractal Approach

Three-Dimensional Nanoscale Morphological Surface Analysis of Polymeric Particles Containing Allium sativum Essential Oil

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Advanced micromorphology study of microbial films grown on Kefir loaded with Açaí extract

Cited by 32 publications

References 47 publications

Fractal Analysis on Surface Topography of Thin Films: A Review

Fractal Analysis on Surface Topography of Thin Films: A Review

Effect of Fe Doping on the Surface Morphology and Supercapacitor Properties of Sr(OH)2 Thin Films: A Fractal Approach

Three-Dimensional Nanoscale Morphological Surface Analysis of Polymeric Particles Containing Allium sativum Essential Oil

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Effect of Fe Doping on the Surface Morphology and Supercapacitor Properties of Sr(OH)₂ Thin Films: A Fractal Approach