Effect of surface roughness on the optical properties of multilayer polymer films

Larena, A.; Millán, Felipe; Pérez, Gloria; Pinto, Gabriel

doi:10.1016/s0169-4332(01)01044-3

Cited by 109 publications

(50 citation statements)

References 8 publications

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“…The film thickness corresponding to five cycles of electropolymerization, is 98.9 « 9.5 nm (n = 6), while the surface roughness is 35.3 nm; the film thickness corresponding to one cycle of electropolymerization is 21.6 nm and a surface roughness is 19.8 nm. Researchers have reported that changes in surface roughness of polymer films alters the optical transmission characteristics of the polymer films, 25 and in our case, changes in film thickness and roughness occur as conditions for electropolymerization are varied. The polymer film does not necessarily grow in regular layers as the polymer forms on the electrode surface.…”

Section: Poly-edot-dtdpp Films On Ito and Afm Measurementsmentioning

confidence: 52%

Cyclic Voltammetric, Chronocoulometric, and Spectroelectrochemical Studies of Electropolymerized Films Based on (3,4-Ethylenedioxythiophene)-Substituted 3,6-Dithiophen-2-yl-2,5-dihydropyrrole[3,4-c]pyrrole-1,4-dione

et al. 2015

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A new compound with the core luminescent dye unit diketopyrrolopyrrole (DPP), namely 3,6-dithiophen-2-yl-2,5-dihydropyrrole [3,4-c]pyrrole-1,4-dione (DTDPP), attached to 3,4-ethylenedioxythiophene (EDOT) was synthesized. From this monomer, polymer films were prepared on glassy carbon and indium tin oxide surfaces using cyclic voltammetry. The films were characterized using cyclic voltammetry, chronocoulometry, and atomic force microscopy. The electropolymerization of the monomer exhibits reversible electrochemistry that transitions to quasireversible electrochemistry. During electropolymerization, the overpotential for the reduction process exceeds the overpotential for the oxidation process and cyclic voltammetric characterization of the films demonstrates that oxidation is more favored than reduction. Spectroelectrochemical measurements confirm that the polymer films demonstrate electrochromic behavior that correlates to the electrochemical observations during characterization of the films.

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Section: Poly-edot-dtdpp Films On Ito and Afm Measurementsmentioning

confidence: 52%

Cyclic Voltammetric, Chronocoulometric, and Spectroelectrochemical Studies of Electropolymerized Films Based on (3,4-Ethylenedioxythiophene)-Substituted 3,6-Dithiophen-2-yl-2,5-dihydropyrrole[3,4-c]pyrrole-1,4-dione

et al. 2015

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“…12,13 NIR spectroscopy is based on diffuse reflectance, so the surface roughness affects the detected signal. 14 Additionally, scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) analysis have been used in pharmaceutics to identify different elements in dosage forms and excipients. 15,16 The amount of magnesium stearate has been previously studied with EDX analysis of the surface of powder particles.…”

Section: Introductionmentioning

confidence: 99%

Monitoring tablet surface roughness during the film coating process

et al. 2006

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The purpose of this study was to evaluate the change of surface roughness and the development of the film during the film coating process using laser profilometer roughness measurements, SEM imaging, and energy dispersive X-ray (EDX) analysis. Surface roughness and texture changes developing during the process of film coating tablets were studied by noncontact laser profilometry and scanning electron microscopy (SEM). An EDX analysis was used to monitor the magnesium stearate and titanium dioxide of the tablets. The tablet cores were film coated with aqueous hydroxypropyl methylcellulose, and the film coating was performed using an instrumented pilot-scale side-vented drum coater. The SEM images of the film-coated tablets showed that within the first 30 minutes, the surface of the tablet cores was completely covered with a thin film. The magnesium signal that was monitored by SEM-EDX disappeared after~15 to 30 minutes, indicating that the tablet surface was homogeneously covered with film coating. The surface roughness started to increase from the beginning of the coating process, and the increase in the roughness broke off after 30 minutes of spraying. The results clearly showed that the surface roughness of the tablets increased until the film coating covered the whole surface area of the tablets, corresponding to a coating time period of 15 to 30 minutes (from the beginning of the spraying phase). Thereafter, the film only became thicker. The methods used in this study were applicable in the visualization of the changes caused by the film coating on the tablet surfaces.

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“…As it is commonly known [28,29], differences in the structure have also an influence on the optical properties, especially Research Article the gloss. The measured gloss value, as indicated in Fig.…”

Section: Characterization Of the Coating Propertiesmentioning

confidence: 99%

Enhancement of the Mechanical Properties of Nanoparticulate Thin Coatings via Surface Modification and Cross‐Linking Additive

et al. 2017

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The application of modified Al 2 O 3 nanoparticles for thin coatings is investigated to improve especially the mechanical characteristics by cross-linking the particles using an additive, together with the formulation parameters as well as the crosslinking kinetics. In general, the experiments demonstrate that the mechanical properties, like hardness and scratch resistance, can be enhanced via particle surface modification in combination with a cross-linking additive. Specifically, the optimal additive concentration was determined in order to obtain coatings with improved mechanical and constant optical properties. These results were related to the structure formation and cross-linking behavior. Mechanisms were identified for this series of experiments to explain how the particles bond with each other and how the coating structure is formed by using different additive ratios.

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Effect of surface roughness on the optical properties of multilayer polymer films

Cited by 109 publications

References 8 publications

Cyclic Voltammetric, Chronocoulometric, and Spectroelectrochemical Studies of Electropolymerized Films Based on (3,4-Ethylenedioxythiophene)-Substituted 3,6-Dithiophen-2-yl-2,5-dihydropyrrole[3,4-c]pyrrole-1,4-dione

Cyclic Voltammetric, Chronocoulometric, and Spectroelectrochemical Studies of Electropolymerized Films Based on (3,4-Ethylenedioxythiophene)-Substituted 3,6-Dithiophen-2-yl-2,5-dihydropyrrole[3,4-c]pyrrole-1,4-dione

Monitoring tablet surface roughness during the film coating process

Enhancement of the Mechanical Properties of Nanoparticulate Thin Coatings via Surface Modification and Cross‐Linking Additive

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