Low-temperature plasma treatment of polylactic acid and PLA/HA composite material

Laput, O.A.; Васенина, И.В.; Salvadori, M. C.; Savkin, K. P.; Zuza, D.A.; Курзина, И. А.

doi:10.1007/s10853-019-03693-4

Cited by 49 publications

(28 citation statements)

References 34 publications

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“…Regarding the surface chemistry, despite being a non-significant difference (p > 0.05), the modification in the O/C ratio of the PLA surface before and after the plasma treatment suggests the prevalence of the oxidation mechanism over the destructive one [32]. It is important to take into account that both mechanisms may take place simultaneously and the predominance of one of them depends on the treatment time, as demonstrated by Izdebska-Podsiadly et al [43] The prevalence of the oxidation route during the plasma treatment in the present study is also supported by the results from the mechanical characterization, as a non-significant difference (p > 0.05) was detected when the plasma treated samples and the non-treated ones were compared (Figure 2).…”

Section: Discussionmentioning

confidence: 82%

“…However, this golden standard depends on the operating conditions that are used. Two mechanisms have been reported about the chemical reactions during the plasma treatment of polylactic acid: an oxidative one and a destructive one [32]. The interaction of oxygen and free radicals could lead to the formation of hydroxyl and peroxide groups, while the mechanism of destruction of plasma-treated PLA generates free radicals, accompanied with the formation of volatile gases.…”

Section: Mechanical Characterizationmentioning

confidence: 99%

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Evaluation of Aloe Vera Coated Polylactic Acid Scaffolds for Bone Tissue Engineering

et al. 2020

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3D-printed polylactic acid (PLA) scaffolds have been demonstrated as being a promising tool for the development of tissue-engineered replacements of bone. However, this material lacks a suitable surface chemistry to efficiently interact with extracellular proteins and, consequently, to integrate into the surrounding tissue when implanted in vivo. In this study, aloe vera coatings have been proposed as a strategy to improve the bioaffinity of this type of structures. Aloe vera coatings were applied at three different values of pH (3, 4 and 5), after treating the surface of the PLA scaffolds with oxygen plasma. The surface modification of the material has been assessed through X-ray photoelectron spectroscopy (XPS) analysis and water contact angle measurements. In addition, the evaluation of the enzymatic degradation of the structures showed that the pH of the aloe vera extracts used as coating influences the degradation rate of the PLA-based scaffolds. Finally, the cell metabolic activity of an in vitro culture of human fetal osteoblastic cells on the samples revealed an improvement of this parameter on aloe vera coated samples, especially for those treated at pH 3. Hence, these structures showed potential for being applied for bone tissue regeneration.

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Section: Discussionmentioning

confidence: 82%

Section: Mechanical Characterizationmentioning

confidence: 99%

Evaluation of Aloe Vera Coated Polylactic Acid Scaffolds for Bone Tissue Engineering

et al. 2020

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“…Apart from the incorporation of specific functional groups, the plasma treatment can alter the surface roughness and increase its free surface energy leading to a material with better interaction with cells. The characterization of the modifications introduced to PLA polymers after atmospheric pressure, low‐temperature argon plasma treatment is properly described in the work by Laput et al [ 78 ] Air plasma has been applied on PLGA surfaces as well, with the purpose of controlling the scaffold dimensional shrinkage and improving scaffold–tissue integration. The authors proposed that plasma treatment enabled the generation of carboxyl groups on the surface of the PLGA scaffolds responsible for inhibiting shrinkage of the biomaterial.…”

Section: Biomaterialsmentioning

confidence: 99%

Recent Advances in Synthetic and Natural Biomaterials‐Based Therapy for Bone Defects

Echazú

Perna

Olivetti

et al. 2022

Macromolecular Bioscience

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Synthetic and natural biomaterials are a promising alternative for the treatment of critical-sized bone defects. Several parameters such as their porosity, surface, and mechanical properties are extensively pointed out as key points to recapitulate the bone microenvironment. Many biomaterials with this pursuit are employed to provide a matrix, which can supply the specific environment and architecture for an adequate bone growth. Nevertheless, some queries remain unanswered. This review discusses the recent advances achieved by some synthetic and natural biomaterials to mimic the native structure of bone and the manufacturing technology applied to obtain biomaterial candidates. The focus of this review is placed in the recent advances in the development of biomaterial-based therapy for bone defects in different types of bone. In this context, this review gives an overview of the potentialities of synthetic and natural biomaterials: polyurethanes, polyesters, hyaluronic acid, collagen, titanium, and silica as successful candidates for the treatment of bone defects.

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“…[32][33][34] Oxygen-containing functional groups such as hydroxyl, carbonyl, and carboxyl have been introduced to the composite surface. [35] Such functionalization can be used for the direct attachment of receptors or catalysts [36] In light of the above prior-art, this article describes the application of nonthermal, low pressure, oxygen plasma operating at a lower frequency for the surface treatment of PCE. Since the etching rate of the polymers is higher than the graphite, [22] this surface treatment results in improvisation of the bulk electrical conductivity, due to the efficient removal of passivating polymer layers from the electrode surface.…”

Section: Introductionmentioning

confidence: 99%

“…[ 32–34 ] Oxygen‐containing functional groups such as hydroxyl, carbonyl, and carboxyl have been introduced to the composite surface. [ 35 ] Such functionalization can be used for the direct attachment of receptors or catalysts [ 36 ]…”

Section: Introductionmentioning

confidence: 99%

Surface tailored graphite–polymer composite electrodes through cold plasma for electrochemical applications

Luhar

Rane

Srivastava

2022

Plasma Processes & Polymers

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Composite electrodes are gradually gaining interest due to their versatile applications. plastic chip electrode (PCE) comprising of graphite and Poly(methyl methacrylate) (PMMA) is one such composite that can be fabricated by simple solution‐phase mixing followed by solvent evaporation. In this study, we report more than two times enhancement in the bulk conductance of PCE by removing the passivating superficial polymer layer above the filler, through the treatment of cold plasma. Comparative characterization of the pre‐ and posttreated electrode has been performed by scanning electron microscopy (SEM), spreading resistance imaging (SRI), contact angle, and current–voltage characteristics as well as electrochemical impedance spectroscopy (EIS). Improved electroactivity of PCE has been demonstrated through cyclic voltammetry (CV).

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Low-temperature plasma treatment of polylactic acid and PLA/HA composite material

Cited by 49 publications

References 34 publications

Evaluation of Aloe Vera Coated Polylactic Acid Scaffolds for Bone Tissue Engineering

Evaluation of Aloe Vera Coated Polylactic Acid Scaffolds for Bone Tissue Engineering

Recent Advances in Synthetic and Natural Biomaterials‐Based Therapy for Bone Defects

Surface tailored graphite–polymer composite electrodes through cold plasma for electrochemical applications

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