Statistical Analysis in Homopolymeric Surfaces

Therézio, Eralci M.; Vega, Maria Letícia; Faria, Roberto Mendonça; Marletta, Alexandre

doi:10.5772/36461

Cited by 3 publications

(3 citation statements)

References 26 publications

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“…We used, in the present investigation, UV-Vis absorption, photoluminescence and ellipsometry emission. As a result, we assign the use of an alternative optical characterization to probe the organic semiconductors obtained via electrochemical techniques [20,23].…”

Section: Introductionmentioning

confidence: 99%

“…Since the physical-chemistry properties and investigation of organic active layers, such as P3ATs thin solid ilms, can elucidate the development of new optoelectronic devices [16][17][18]. Interface efects cause signiicant quenching of excited carriers and it is commonly investigated by conventional spectroscopic techniques [15,19], such as ultraviolet-visible absorption (UV-Vis), photoluminescence (PL), photoluminescence excitation (PLE), vibrational spectroscopy (FT-IR and RAMAN) [8,12,20,21] and the morphological technique of atomic force microscopy (AFM) [22][23][24]. In the case of energy transfer processes of excited carriers, the analysis of polarization of emited light can be directly correlated with polymeric chain position parallel to the direction of the transition dipole moment [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical Deposition of P3AT Films Used as a Probe of Optical Properties in Polymeric System

Sá¹,

Basílio²,

Santana³

et al. 2017

Modern Technologies for Creating the Thin-Film Systems and Coatings

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Poly(3-alkylthiophene) (P3ATs) have been extensively used in photovoltaic devices such as a p-type organic Semiconductors. However, several electronic properties of P3ATs present energy transfer inter-and intra-chains that have direct consequences on the performance of optoelectronic devices. Traditionally electrochemical techniques, such as cyclic voltammetry, chronoamperometry and chronocoulometry, have been applied to process polymer thin ilms and unconventional spectroscopy techniques are used to characterize the electronic properties. In the present work, we used an innovative technique called ellipsometry emission to investigate the optical properties of P3AT ilms. We propose a new approach to study the electrochemical synthesize and unintentional doping processes of polymeric systems. We showed a strong correlation between the electrochemical synthesis and the optical properties controlling the ilm growth conditions for P3ATs. The results obtained in the present study can be potentially utilized for applications in organic devices, mainly in photovoltaic cells when the ilm deposition and the optical properties control are relevant.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrochemical Deposition of P3AT Films Used as a Probe of Optical Properties in Polymeric System

Sá¹,

Basílio²,

Santana³

et al. 2017

Modern Technologies for Creating the Thin-Film Systems and Coatings

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“…[12] Scattering techniques have also been used for analyzing the surface roughness. [13] Eraldo Riberiro and Mubarak Shah [14] has mentioned the use of texture analysis to characterize nanoscale materials as one of the possible avenues for future research in nanoscale imaging. Q-Lin et al [15] and Yadav et al [16] have made attempts to use a multifractal analysis [17,18] to measure the surface morphology of thin films from the multifractal spectra of the thin film.…”

Section: Introductionmentioning

confidence: 99%

Uniformity analysis in nanocrystalline silver thin films using fuzzy inference system

John

Nair

Gopchandran

et al. 2014

Surf. Interface Anal.

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An automatic and efficient technique to analyze the uniformity of nanoscale images using wavelets, feature similarity index measure (FSIM) and fuzzy inference system is reported. It has been successfully tested on scanning electron micrographs of nanocrystalline silver thin films. Thin films are prepared using on-axis and off-axis pulse laser deposition (PLD) technique. It is found that the film prepared using on-axis PLD is more uniformly distributed and has smoother texture compared with that of the off-axis technique. In order to analyze the images quantitatively, they are transformed to the wavelet domain to extract the localized frequency variations and a uniformity measure is derived using a fuzzy inference system for quantitatively analyzing the uniformity of each image. The surface plot of the FSIM values of the image is found to be an efficient tool for nanoscientists to evaluate the smoothness of the thin film surfaces. This study is expected to help the nanoscientists to understand these nanostructures in detail.

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Pulsatile Discharge from Polymeric Scaffolds: A Novel Method for Modulated Drug Release

Campana

Marletta

Piovesan

et al. 2019

Bulletin of the Chemical Society of Japan

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Controlled drug release holds promise to revolutionize medicine, particularly if short-term and long-term release can be combined in a single system. We present here a new pulsatile release system, in which the pulses were achieved using 3D scaffolds of poly(l-lactic acid), PLLA. From a morphological characterization of the scaffold’s surfaces, before and after releasing experiments at distinct pHs, we infer that release is governed by electrostatic interactions and the fractal geometry of the scaffolds. Furthermore, the scaffold can present short-term (within hours) or long-term (several days long) releasing profiles by varying the pH, which opens the way for unprecedented drug release control.

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Statistical Analysis in Homopolymeric Surfaces

Cited by 3 publications

References 26 publications

Electrochemical Deposition of P3AT Films Used as a Probe of Optical Properties in Polymeric System

Electrochemical Deposition of P3AT Films Used as a Probe of Optical Properties in Polymeric System

Uniformity analysis in nanocrystalline silver thin films using fuzzy inference system

Pulsatile Discharge from Polymeric Scaffolds: A Novel Method for Modulated Drug Release

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