A Green Approach for Preparing High-Loaded Sepiolite/Polymer Biocomposites

Credico, Barbara Di; Tagliaro, Irene; Cobani, Elkid; Conzatti, Lucia; D’Arienzo, Massimiliano; Giannini, Luca; Mascotto, Simone; Scotti, Roberto; Stagnaro, Paola; Tadiello, Luciano

doi:10.3390/nano9010046

Cited by 23 publications

(17 citation statements)

References 54 publications

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“…Zeta-potential results of PS9 and G30 at different concentrations are presented in Figure 2 . Regarding ζ potential of minerals in pH 7 buffer, PS9 and G30 results were in agreement with other sepiolite and palygorskite samples previously studied [ 94 , 95 , 96 ]. In particular, the zeta potential of PS9 in aqueous pH 7 solution was more negative (higher) than that of G30.…”

Section: Resultssupporting

confidence: 90%

Wound Healing Activity of Nanoclay/Spring Water Hydrogels

et al. 2020

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Background: hydrogels prepared with natural inorganic excipients and spring waters are commonly used in medical hydrology. Design of these clay-based formulations continues to be a field scarcely addressed. Safety and wound healing properties of different fibrous nanoclay/spring water hydrogels were addressed. Methods: in vitro biocompatibility, by means of MTT assay, and wound healing properties were studied. Confocal Laser Scanning Microscopy was used to study the morphology of fibroblasts during the wound healing process. Results: all the ingredients demonstrated to be biocompatible towards fibroblasts. Particularly, the formulation of nanoclays as hydrogels improved biocompatibility with respect to powder samples at the same concentration. Spring waters and hydrogels were even able to promote in vitro fibroblasts motility and, therefore, accelerate wound healing with respect to the control. Conclusion: fibrous nanoclay/spring water hydrogels proved to be skin-biocompatible and to possess a high potential as wound healing formulations. Moreover, these results open new prospects for these ingredients to be used in new therapeutic or cosmetic formulations.

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Section: Resultssupporting

confidence: 90%

Wound Healing Activity of Nanoclay/Spring Water Hydrogels

et al. 2020

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“…Rubber is a widespread material for many applications in everyday life, the most significant being pneumatic tires for automobiles. Its mechanical properties (such as tensile strength and abrasion resistance [40]) are generally improved by the addition of reinforcing filler NPs [41], as carbon black, silica, and clays, typically employed to produce nanocomposites (NCs) for tires with improved abrasion resistance, wet grip, and rolling resistance [42][43][44][45][46][47]. NCs mechanical properties are further increased by the cross-linking of rubber chains through the vulcanization to form a three-dimensional network, which provides elasticity and tensile strength.…”

Section: Rubber Vulcanizationmentioning

confidence: 99%

Zinc-Based Curing Activators: New Trends for Reducing Zinc Content in Rubber Vulcanization Process

et al. 2019

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The efficiency of sulfur vulcanization reaction in rubber industry is generally improved thanks to the combined use of accelerators (as sulphenamides), activators (inorganic oxides), and co-activators (fatty acids). The interaction among these species is responsible for the formation of intermediate metal complexes, which are able to increase the reactivity of sulfur towards the polymer and to promote the chemical cross-links between the rubber chains. The high number of species and reactions that are involved contemporarily in the process hinders the complete understanding of its mechanism despite the long history of vulcanization. In this process, ZnO is considered to be the most efficient and major employed activator and zinc-based complexes that formed during the first steps of the reaction are recognized to play a main role in determining both the kinetic and the nature of the cross-linked products. However, the low affinity of ZnO towards the rubber entails its high consumption (3–5 parts per hundred, phr) to achieve a good distribution in the matrix, leading to a possible zinc leaching in the environment during the life cycle of rubber products (i.e., tires). Thanks to the recent recognition of ZnO ecotoxicity, especially towards the aquatic environment, these aspects gain a critical importance in view of the urgent need to reduce or possibly substitute the ZnO employed in rubber vulcanization. In this review, the reactivity of ZnO as curing activator and its role in the vulcanization mechanism are highlighted and deeply discussed. A complete overview of the recent strategies that have been proposed in the literature to improve the vulcanization efficiency by reducing the amount of zinc that is used in the process is also reported.

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“…Several clay minerals have been widely studied to improve the mechanical properties of polymeric matrices, such as montmorillonite (Rodrigues Passos Severino et al, 2019;Passer et al, 2013a;2013b;Barbalho, 2012;Bai et al, 2018), halloysite (Bertolino et al, 2020;Lisuzzo et al, 2020;Alam et al, 2020), sepiolite (Ferrari et al, 2017;Kim et al, 2020;Fernández-Barranco et al, 2020;Wang et al, 2020;Sun et al, 2020;Di Credico et al, 2019) and attapulgite (palygorskite) (da Silva et al, 2020;Tian et al, 2020;Yang et al, 2020;Elbassyoni et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

A Brief Review of the Latest Advances of Attapulgite as a Reinforcing Agent in Polymer Matrix Nanocomposites

Silva¹,

Souza²,

Morgado³

et al. 2021

American Journal of Engineering and Applied Sciences

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The development of polymeric nanocomposites using clay minerals as a Nano filler is of great interest to researchers and industry. Many clay minerals are used to modify the properties of the polymers; this strategy improves the thermal and mechanical performance and changes the surface finishing and the processing characteristics. The Attapulgite (ATP), which is a clay mineral of the hydrated magnesium silicates family, has gained prominence in recent years because it combines low cost and high performance. It has a large surface area, strong absorption capacity superior to any other natural mineral, good mechanical resistance and thermal stability. These properties make ATP an ideal candidate for reinforcing polymeric materials. Different approaches and emerging technologies have been applied to improve the thermal and mechanical properties of polymer/ATP nanocomposites which can extend the different chemical treatments used in ATP. Therefore, this review article presents the latest advances related to the use of ATP in the development of polymeric nanocomposites, showing future perspectives for new trends in ATP applications. In general, ATP modifies the mechanical properties of polymers, either in the natural or modified state. And is a good alternative for the replacement of lamellar clays such as montmorillonites with the advantage of having a lower cost and a wide world market to be explored, that which drive new trends in applications for ATP, such as flame retardant of cotton fabrics, dye adsorption, hydrogel membranes for wound dressing, sustainable packaging and fuel cell applications.

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A Green Approach for Preparing High-Loaded Sepiolite/Polymer Biocomposites

Cited by 23 publications

References 54 publications

Wound Healing Activity of Nanoclay/Spring Water Hydrogels

Wound Healing Activity of Nanoclay/Spring Water Hydrogels

Zinc-Based Curing Activators: New Trends for Reducing Zinc Content in Rubber Vulcanization Process

A Brief Review of the Latest Advances of Attapulgite as a Reinforcing Agent in Polymer Matrix Nanocomposites

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