Publications by authors named "Cristina Schreiner"

The European Green Deal's goals are anticipated to be fulfilled in large part thanks to the New Circular Economy Action Plan. It is believed that recycling materials will have a significant positive impact on the environment, particularly in terms of reducing greenhouse gas emissions and the impacts this will have on preventing climate change. Due to the complexity of the issue and its significant practical ramifications, the activity of Waste Electrical and Electronic Equipment (WEEE) collection networks is a subject of interest for researchers and managers, in accordance with the principles that recent laws have addressed in a large number of industrialized countries.

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The European methodology for plastics, as a feature of the EU's circular economy activity plan, ought to support the decrease in plastic waste. The improvement of recycled plastics' economics and quality is one important part of this action plan. Additionally, achieving the requirement that all plastic packaging sold in the EU by 2030 be recyclable or reusable is an important objective.

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The purpose of this work was to obtain an elastic composite material from polymer powders (polyurethane and polypropylene) with the addition of BaTiO until 35% with tailored dielectric and piezoelectric features. The filament extruded from the composite material was very elastic but had good features to be used for 3D printing applications. It was technically demonstrated that the 3D thermal deposition of composite filament with 35% BaTiO was a convenient process for achieving tailored architectures to be used as devices with functionality as piezoelectric sensors.

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Article Synopsis
  • This paper discusses the development of five new polymer composite materials that incorporate ferrite nano-powder through mechanical mixing and hot pressing methods.
  • The ferrite powders were synthesized using a cost-effective co-precipitation technique, and the resulting composites were thoroughly characterized for their physical, thermal, and electromagnetic properties.
  • The research aims to create flexible, lightweight materials suitable for the electrical and automotive industries, showing effective protection against electromagnetic interference across various frequencies, with promising thermal stability and enhanced lifespan.
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Dielectric properties for nanocomposites with metallic fillers inside a polymer matrix were determined using CST STUDIO SUITE-Electromagnetic field simulation software followed by the free-space Nicolson-Ross-Weir procedure. The structure is randomly generated to simulate the intrinsic non-uniformity of real nanomaterials. Cubic insertions were equated to corresponding spherical particles in order to provide either the same volume index or the same exterior surface index.

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Composite materials are materials with anisotropic properties that are created by combining several different components in a way that allows the best qualities of each component to be used. In this paper, raw materials were used to obtain composite materials of the type TPU/PP/BaTiO powder. The thermogravimetric analysis, dynamic differential calorimetry, and scanning electron microscopy were carried out.

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Article Synopsis
  • New research reveals important insights into how ampicillin degrades when exposed to UV light, measured using techniques like photoluminescence (PL), Raman scattering, and FTIR spectroscopy.
  • The presence of excipients and an alkaline environment enhances the photodegradation process, indicating changes in the compound's structure and the formation of new chemical entities.
  • Key indicators of these changes include a new infrared band at 3450 cm, variations in UV-VIS spectra, and shifts in Raman line intensities, leading to a proposed chemical mechanism for the degradation process.
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All-solid-state sensors with polyvinyl chloride (PVC)-based membranes using off-the-shelf N-hydroxysuccinimide (NHS) and succinimide (Succ) ionophores were prepared using DOP (dioctyl phthalate) and NPOE (ortho-nitrophenyloctyl ether) as plasticizers. Good responses were obtained when NHS was used. The potentiometric response of the proposed electrode is independent of pH over the range 2-6.

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