Carla Dalmolin | Universidade do Estado de Santa Catarina (original) (raw)

Papers by Carla Dalmolin

Research paper thumbnail of The Effects of Graphene Oxide and Iron Oxide (II) Co-addition on Properties of a Polypropylene/high-density Polyethylene Blend

Materials research, 2024

This study investigated the impact of adding graphene oxide (GO) and iron oxide (II) (Fe 3 O 4) n... more This study investigated the impact of adding graphene oxide (GO) and iron oxide (II) (Fe 3 O 4) nanoparticles individually and in combination on the morphology, thermo-mechanical, and dielectric properties of a Polypropylene/High-Density Polyethylene (PP/HDPE) blend. By adding these nanoparticles separately or as a mixture, we can determine if both mechanisms have a synergistic effect and how they impact the dielectric constant values of their nanocomposites. The nanoparticle mixture was prepared in both an alkaline and a neutral medium. The mixture in the alkaline medium contained lower quantities of iron nanoparticles than in the neutral medium, and they were localized on the surface of GO. The nanocomposites showed significant differences in dynamic-mechanical and dielectric properties. The system with Fe 3 O 4 exhibited a higher storage modulus, while the system with GO had a higher dielectric constant. However, no synergistic effect was observed in the nanoparticle mixtures.

Research paper thumbnail of Photocatalytic and Structure Evaluation of G-C3n4/Carbon Microspheres and Melam/Dimelem Intermediates Under White Led and Uva-Vis Irradiation

Research paper thumbnail of Physicochemical interactions between polyaniline and graphene oxide: the reasons for the stability of their chemical structure and thermal properties

Materials Today Chemistry, 2021

Research paper thumbnail of Preparação e caracterização de eletrodos de polímeros condutores sobre carbono vítreo reticulado (RVC) para a aplicação em baterias secundárias

Universidade Federal de São Carlos, Mar 22, 2006

Research paper thumbnail of Effect of carbon nanotube location and dispersed phase on the dielectric properties of polypropylene/high‐density polyethylene/carbon nanotube nanodielectrics

Journal of Applied Polymer Science

Research paper thumbnail of Polyaniline in the Environmental Scenario: An Approach on Heterogeneous Photocatalysis

Polyaniline is a conducting polymer that has recently been studied regarding its potential in the... more Polyaniline is a conducting polymer that has recently been studied regarding its potential in the removal of contaminants by heterogeneous photocatalysis. Since it is a polymer with a high absorption capacity of photons in the visible region, it promotes the photosensitization of catalysts that are typically inactive in solar systems. The increasing number of publications applying photocatalysis and composite catalysts based on polyaniline highlights the importance of this subject. This review systematizes the most important and specific contributions of composite catalysts formed by polyaniline. The main mechanisms proposed for photosensitization, which show the synergism between the phases of the composite, are summarized. Moreover, the relevance of morphology and conductivity of the composite catalyst, operating parameters (eg. pH, and light source contaminant) are some of the aspects discussed, revealing how these differ from traditional catalysts. Future prospects for the conti...

Research paper thumbnail of The influence of the industrial processing on the degradation of poly(hidroxybutyrate) - PHB

Materials Research, 2013

PHB was characterized after different industrial processes by Differential Scanning Calorimetry (... more PHB was characterized after different industrial processes by Differential Scanning Calorimetry (DSC), Fourier Transform Infrared Spectroscopy (FTIR), Melt Flow Index (MFI), Complex Dielectric Relaxation (CDR) and Size Exclusion Chromatography (SEC). Some properties of PHB were investigated before and after processing, in order to understand how temperature and other extrusion or injection conditions affect the polymer degradation. All the processed samples showed an increasing in the melt flow index, a decreasing of the dynamic crystallization temperature, and a reduction in the molar mass, suggesting some degradation. The molar mass reduction after processing, predicted when only thermal degradation is considered, was calculated in function of the kinetic parameters, such as constant thermal degradation and residence time during the industrial processing. It was found that the real molar mass reduction was higher than the theoretical value, indicating an important contribution of the shearing of polymeric chains during processing in the PHB degradation.

Research paper thumbnail of Development of Carbon Electrodes for the Measurment of Skin

Carbon electrodes show the advantage in comparison to metal electrodes that they are chemically i... more Carbon electrodes show the advantage in comparison to metal electrodes that they are chemically inert and have a low impedance. Therefore, the aim of this work was to develop two impedance probes whose electrodes were based on carbon and to test their usability for the measurement of skin impedance. Knowing the passive electrical properties of skin is of importance e.g. for dosimetry purposes. The electrode material for one probe was graphite mixed into paraffin wax and for the other electrode carbon fibers that were glued together with silicone. The electrodes were formed concentric with an inner electrode and an outer ring electrode. Broadband frequency sweeps from 1 Hz to 1 MHz were conducted on the palm of the left hand of the author in a dry and a wet state. The impedance of dry skin at low frequencies lay above 100 kΩ, the high frequency value lay at a few hundred Ohms. One dominant dispersion could be observed. On wet skin a low frequency impedance in between 10 kΩ and 100 kΩ...

Research paper thumbnail of Synthesis of Polyaniline Under Electrolytic Plasma on Carbon Fiber Fabric

Macromolecular Symposia, 2020

Research paper thumbnail of A Polianilina No Cenário Ambiental: Uma Aborgagem Sobre Fotocatálise Heterogênea

Polyaniline is a conducting polymer that has recently been studied regarding its potential in the... more Polyaniline is a conducting polymer that has recently been studied regarding its potential in the removal of contaminants by heterogeneous photocatalysis. Since it is a polymer with a high absorption capacity of photons in the visible region, it promotes the photosensitization of catalysts that are typically inactive in solar systems. The increasing number of publications applying photocatalysis and composite catalysts based on polyaniline highlights the importance of this subject. This review systematizes the most important and specific contributions of composite catalysts formed by polyaniline. The main mechanisms proposed for photosensitization, which show the synergism between the phases of the composite, are summarized. Moreover, the relevance of morphology and conductivity of the composite catalyst, operating parameters (eg. pH, and light source contaminant) are some of the aspects discussed, revealing how these differ from traditional catalysts. Future prospects for the continuation and improvement of this issue mainly involve a greater variety of contaminant removal tests and understanding of relations between the structure of the material and its photocatalytic property.

Research paper thumbnail of Influence of crystallinity and chain interactions on the electrical properties of polyamides/carbon nanotubes nanocomposites

Journal of Applied Polymer Science

Research paper thumbnail of N2 -H2 plasma functionalization of carbon fiber fabric for polyaniline grafting

Plasma Processes and Polymers

Research paper thumbnail of The combined effect of plasticizers and graphene on properties of poly(lactic acid)

Journal of Applied Polymer Science

Research paper thumbnail of Active screen plasma system applied to polymer surface modification: poly(lactic acid) surface activation before polyaniline graft polymerization in aqueous medium

Journal of Polymer Engineering

An active screen plasma system (ASPS) was used for the surface activation of poly(lactic acid) (P... more An active screen plasma system (ASPS) was used for the surface activation of poly(lactic acid) (PLA) as a pretreatment before the oxidative graft polymerization of polyaniline (PANI). In ASPS, the plasma glow discharge occurs outside the grid, and the samples to be treated are placed inside the cage where they are subjected to a floating potential (about −12 V). An increase in hydrophilicity was observed for all samples after Ar plasma treatment. In addition, a decrease in thermal stability and changes in crystallization behavior were observed for PLA samples treated for a longer time. After PANI graft polymerization, smoothing of the surface topography was noticed in samples treated for short time periods. Such a change in the topography, in addition to surface activation, provides better conditions for subsequent PANI grafting.

Research paper thumbnail of Role of π‐π interactions and chain flexibility in dispersion and dynamic‐mechanical properties of nanocomposites with multiple wall carbon nanotubes

Journal of Applied Polymer Science

Research paper thumbnail of Avaliação da Capacidade de Adsorção de BTEX por Nanoestrutura Adsorvente Confeccionada com Argila Esmectita de Origem Brasileira

Revista Processos Químicos

Visando oferecer uma alternativa ao tratamento de efl uentes com complexos orgânicos solúveis, co... more Visando oferecer uma alternativa ao tratamento de efl uentes com complexos orgânicos solúveis, conhecidos como BTEX, foi desenvolvida uma nanoestrutura adsorvente seletiva de complexos orgânicos com argila de capacidade de troca catiônica de origem brasileira a partir de técnicas de processamento de substâncias minerais. As nanoestruturas foram preparadas com a argila esmectitas vermelha (ArVe) ativada com carbonato de sódio e cloreto de hexadecil trimetilamônia. Foi observado que a variação na concentração de BETX em solução é proporcional à concentração da ArVe organofílica e que as isotemas de adsorção são aderentes aos modelos de Langmuir e Freundlich, com exceção do benzeno, que apresentou dispersão entre o modelo e os dados experimentais. Os tempos de residência para a saturação da ArVe organofílica e a velocidade inicial de adsorção para cada solvente foram obtidos através dos dados calculados para a cinética de pseudo 2ª ordem e pelas isotermas de adsorção. Os resultados ind...

Research paper thumbnail of Plasticizer effect and electronic diffusive behavior of polyaniline-modified clay in polystyrene nanocomposites

Research paper thumbnail of Electrical and thermal properties of PLA/CNT composite films

Matéria (Rio de Janeiro)

Conducting polymers presents many potential applications such as biosensors and biofuelcells. How... more Conducting polymers presents many potential applications such as biosensors and biofuelcells. However, to be used in those devices, a thin film must be deposited onto a conducting and biocompatible substrate. In this work, carbon nanotubes (CNT) were mixed in a poly (lactic acid)-PLA-matrix with different compositions (from 0.25 to 5.0 %) in order to form conducting composites suitable to the deposition of a conducting polymer. Thermal properties of PLA/CNT composites were evaluated by Thermogravimetry (TG) and Differenctial Scanning Calorimetry (DSC), and the electrical properties were evaluated by 2-probe method and by Electrochemical Impedance Spectroscopy (EIS). Thermal analysis showed and influence of CNT quantities on PLA crystallization, which also showed an influence on conductivity of the tested materials. Besides, the conductivity of PLA/NTC 1% film showed similar values of the conducting polymer (Pani) itself.

Research paper thumbnail of Sinergia entre a Indústria e Programas de Pós-graduação no Brasil: Um Caso de Sucesso na Temática de Gestão e Tecnologias Ambientais

Revista Virtual De Quimica, Nov 12, 2013

Research paper thumbnail of Eletrodos De CVR/Polímero Condutor Para a Construção De Uma Bateria Toda Polimérica

RVC/Conducting Polymer Electrodes for the design of an all-polymeric battery system The general p... more RVC/Conducting Polymer Electrodes for the design of an all-polymeric battery system The general purpose of this work is the optimization of the conducting polymer deposition on RVC and the use of these electrodes in an all-polymeric ion-lithium battery, which means an anode and a cathode made of conducting polymers. The high surface area of these materials influenced positively on the electrochemical behavior of the electrodes, leading to high-specific capacity electrodes when compared to similar bidimensional electrodes. Charge-discharge tests for batteries using RVC/polymer electrodes as the cathodic material showed similar or even higher specific capacities than the ones found in the literature. It is believed that the substrate's high surface area is the responsible for these findings, since it facilitates the redox reactions in the polymers. Introdução O interesse em produzir uma bateria toda polimérica é principalmente devido à baixa densidade dos polímeros e ao baixo impa...

Research paper thumbnail of The Effects of Graphene Oxide and Iron Oxide (II) Co-addition on Properties of a Polypropylene/high-density Polyethylene Blend

Materials research, 2024

This study investigated the impact of adding graphene oxide (GO) and iron oxide (II) (Fe 3 O 4) n... more This study investigated the impact of adding graphene oxide (GO) and iron oxide (II) (Fe 3 O 4) nanoparticles individually and in combination on the morphology, thermo-mechanical, and dielectric properties of a Polypropylene/High-Density Polyethylene (PP/HDPE) blend. By adding these nanoparticles separately or as a mixture, we can determine if both mechanisms have a synergistic effect and how they impact the dielectric constant values of their nanocomposites. The nanoparticle mixture was prepared in both an alkaline and a neutral medium. The mixture in the alkaline medium contained lower quantities of iron nanoparticles than in the neutral medium, and they were localized on the surface of GO. The nanocomposites showed significant differences in dynamic-mechanical and dielectric properties. The system with Fe 3 O 4 exhibited a higher storage modulus, while the system with GO had a higher dielectric constant. However, no synergistic effect was observed in the nanoparticle mixtures.

Research paper thumbnail of Photocatalytic and Structure Evaluation of G-C3n4/Carbon Microspheres and Melam/Dimelem Intermediates Under White Led and Uva-Vis Irradiation

Research paper thumbnail of Physicochemical interactions between polyaniline and graphene oxide: the reasons for the stability of their chemical structure and thermal properties

Materials Today Chemistry, 2021

Research paper thumbnail of Preparação e caracterização de eletrodos de polímeros condutores sobre carbono vítreo reticulado (RVC) para a aplicação em baterias secundárias

Universidade Federal de São Carlos, Mar 22, 2006

Research paper thumbnail of Effect of carbon nanotube location and dispersed phase on the dielectric properties of polypropylene/high‐density polyethylene/carbon nanotube nanodielectrics

Journal of Applied Polymer Science

Research paper thumbnail of Polyaniline in the Environmental Scenario: An Approach on Heterogeneous Photocatalysis

Polyaniline is a conducting polymer that has recently been studied regarding its potential in the... more Polyaniline is a conducting polymer that has recently been studied regarding its potential in the removal of contaminants by heterogeneous photocatalysis. Since it is a polymer with a high absorption capacity of photons in the visible region, it promotes the photosensitization of catalysts that are typically inactive in solar systems. The increasing number of publications applying photocatalysis and composite catalysts based on polyaniline highlights the importance of this subject. This review systematizes the most important and specific contributions of composite catalysts formed by polyaniline. The main mechanisms proposed for photosensitization, which show the synergism between the phases of the composite, are summarized. Moreover, the relevance of morphology and conductivity of the composite catalyst, operating parameters (eg. pH, and light source contaminant) are some of the aspects discussed, revealing how these differ from traditional catalysts. Future prospects for the conti...

Research paper thumbnail of The influence of the industrial processing on the degradation of poly(hidroxybutyrate) - PHB

Materials Research, 2013

PHB was characterized after different industrial processes by Differential Scanning Calorimetry (... more PHB was characterized after different industrial processes by Differential Scanning Calorimetry (DSC), Fourier Transform Infrared Spectroscopy (FTIR), Melt Flow Index (MFI), Complex Dielectric Relaxation (CDR) and Size Exclusion Chromatography (SEC). Some properties of PHB were investigated before and after processing, in order to understand how temperature and other extrusion or injection conditions affect the polymer degradation. All the processed samples showed an increasing in the melt flow index, a decreasing of the dynamic crystallization temperature, and a reduction in the molar mass, suggesting some degradation. The molar mass reduction after processing, predicted when only thermal degradation is considered, was calculated in function of the kinetic parameters, such as constant thermal degradation and residence time during the industrial processing. It was found that the real molar mass reduction was higher than the theoretical value, indicating an important contribution of the shearing of polymeric chains during processing in the PHB degradation.

Research paper thumbnail of Development of Carbon Electrodes for the Measurment of Skin

Carbon electrodes show the advantage in comparison to metal electrodes that they are chemically i... more Carbon electrodes show the advantage in comparison to metal electrodes that they are chemically inert and have a low impedance. Therefore, the aim of this work was to develop two impedance probes whose electrodes were based on carbon and to test their usability for the measurement of skin impedance. Knowing the passive electrical properties of skin is of importance e.g. for dosimetry purposes. The electrode material for one probe was graphite mixed into paraffin wax and for the other electrode carbon fibers that were glued together with silicone. The electrodes were formed concentric with an inner electrode and an outer ring electrode. Broadband frequency sweeps from 1 Hz to 1 MHz were conducted on the palm of the left hand of the author in a dry and a wet state. The impedance of dry skin at low frequencies lay above 100 kΩ, the high frequency value lay at a few hundred Ohms. One dominant dispersion could be observed. On wet skin a low frequency impedance in between 10 kΩ and 100 kΩ...

Research paper thumbnail of Synthesis of Polyaniline Under Electrolytic Plasma on Carbon Fiber Fabric

Macromolecular Symposia, 2020

Research paper thumbnail of A Polianilina No Cenário Ambiental: Uma Aborgagem Sobre Fotocatálise Heterogênea

Polyaniline is a conducting polymer that has recently been studied regarding its potential in the... more Polyaniline is a conducting polymer that has recently been studied regarding its potential in the removal of contaminants by heterogeneous photocatalysis. Since it is a polymer with a high absorption capacity of photons in the visible region, it promotes the photosensitization of catalysts that are typically inactive in solar systems. The increasing number of publications applying photocatalysis and composite catalysts based on polyaniline highlights the importance of this subject. This review systematizes the most important and specific contributions of composite catalysts formed by polyaniline. The main mechanisms proposed for photosensitization, which show the synergism between the phases of the composite, are summarized. Moreover, the relevance of morphology and conductivity of the composite catalyst, operating parameters (eg. pH, and light source contaminant) are some of the aspects discussed, revealing how these differ from traditional catalysts. Future prospects for the continuation and improvement of this issue mainly involve a greater variety of contaminant removal tests and understanding of relations between the structure of the material and its photocatalytic property.

Research paper thumbnail of Influence of crystallinity and chain interactions on the electrical properties of polyamides/carbon nanotubes nanocomposites

Journal of Applied Polymer Science

Research paper thumbnail of N2 -H2 plasma functionalization of carbon fiber fabric for polyaniline grafting

Plasma Processes and Polymers

Research paper thumbnail of The combined effect of plasticizers and graphene on properties of poly(lactic acid)

Journal of Applied Polymer Science

Research paper thumbnail of Active screen plasma system applied to polymer surface modification: poly(lactic acid) surface activation before polyaniline graft polymerization in aqueous medium

Journal of Polymer Engineering

An active screen plasma system (ASPS) was used for the surface activation of poly(lactic acid) (P... more An active screen plasma system (ASPS) was used for the surface activation of poly(lactic acid) (PLA) as a pretreatment before the oxidative graft polymerization of polyaniline (PANI). In ASPS, the plasma glow discharge occurs outside the grid, and the samples to be treated are placed inside the cage where they are subjected to a floating potential (about −12 V). An increase in hydrophilicity was observed for all samples after Ar plasma treatment. In addition, a decrease in thermal stability and changes in crystallization behavior were observed for PLA samples treated for a longer time. After PANI graft polymerization, smoothing of the surface topography was noticed in samples treated for short time periods. Such a change in the topography, in addition to surface activation, provides better conditions for subsequent PANI grafting.

Research paper thumbnail of Role of π‐π interactions and chain flexibility in dispersion and dynamic‐mechanical properties of nanocomposites with multiple wall carbon nanotubes

Journal of Applied Polymer Science

Research paper thumbnail of Avaliação da Capacidade de Adsorção de BTEX por Nanoestrutura Adsorvente Confeccionada com Argila Esmectita de Origem Brasileira

Revista Processos Químicos

Visando oferecer uma alternativa ao tratamento de efl uentes com complexos orgânicos solúveis, co... more Visando oferecer uma alternativa ao tratamento de efl uentes com complexos orgânicos solúveis, conhecidos como BTEX, foi desenvolvida uma nanoestrutura adsorvente seletiva de complexos orgânicos com argila de capacidade de troca catiônica de origem brasileira a partir de técnicas de processamento de substâncias minerais. As nanoestruturas foram preparadas com a argila esmectitas vermelha (ArVe) ativada com carbonato de sódio e cloreto de hexadecil trimetilamônia. Foi observado que a variação na concentração de BETX em solução é proporcional à concentração da ArVe organofílica e que as isotemas de adsorção são aderentes aos modelos de Langmuir e Freundlich, com exceção do benzeno, que apresentou dispersão entre o modelo e os dados experimentais. Os tempos de residência para a saturação da ArVe organofílica e a velocidade inicial de adsorção para cada solvente foram obtidos através dos dados calculados para a cinética de pseudo 2ª ordem e pelas isotermas de adsorção. Os resultados ind...

Research paper thumbnail of Plasticizer effect and electronic diffusive behavior of polyaniline-modified clay in polystyrene nanocomposites

Research paper thumbnail of Electrical and thermal properties of PLA/CNT composite films

Matéria (Rio de Janeiro)

Conducting polymers presents many potential applications such as biosensors and biofuelcells. How... more Conducting polymers presents many potential applications such as biosensors and biofuelcells. However, to be used in those devices, a thin film must be deposited onto a conducting and biocompatible substrate. In this work, carbon nanotubes (CNT) were mixed in a poly (lactic acid)-PLA-matrix with different compositions (from 0.25 to 5.0 %) in order to form conducting composites suitable to the deposition of a conducting polymer. Thermal properties of PLA/CNT composites were evaluated by Thermogravimetry (TG) and Differenctial Scanning Calorimetry (DSC), and the electrical properties were evaluated by 2-probe method and by Electrochemical Impedance Spectroscopy (EIS). Thermal analysis showed and influence of CNT quantities on PLA crystallization, which also showed an influence on conductivity of the tested materials. Besides, the conductivity of PLA/NTC 1% film showed similar values of the conducting polymer (Pani) itself.

Research paper thumbnail of Sinergia entre a Indústria e Programas de Pós-graduação no Brasil: Um Caso de Sucesso na Temática de Gestão e Tecnologias Ambientais

Revista Virtual De Quimica, Nov 12, 2013

Research paper thumbnail of Eletrodos De CVR/Polímero Condutor Para a Construção De Uma Bateria Toda Polimérica

RVC/Conducting Polymer Electrodes for the design of an all-polymeric battery system The general p... more RVC/Conducting Polymer Electrodes for the design of an all-polymeric battery system The general purpose of this work is the optimization of the conducting polymer deposition on RVC and the use of these electrodes in an all-polymeric ion-lithium battery, which means an anode and a cathode made of conducting polymers. The high surface area of these materials influenced positively on the electrochemical behavior of the electrodes, leading to high-specific capacity electrodes when compared to similar bidimensional electrodes. Charge-discharge tests for batteries using RVC/polymer electrodes as the cathodic material showed similar or even higher specific capacities than the ones found in the literature. It is believed that the substrate's high surface area is the responsible for these findings, since it facilitates the redox reactions in the polymers. Introdução O interesse em produzir uma bateria toda polimérica é principalmente devido à baixa densidade dos polímeros e ao baixo impa...