Madina Shamsuyeva

• Dr.
• Head of Department at Leibniz Universität Hannover

Carbon with depleted d¹³C (down to − 25.6‰ VPDB) found in > 3.7 billion year old metamorphic sediments from the Isua Supracrustal Belt, Southwestern Greenland, has been proposed to represent the oldest remains of life on Earth. Graphitic inclusions within garnet porphyroblasts from this locality have been shown to associate with elements consistent...

Over the past few decades, the topic of recycling has become increasingly prominent in the field of sustainable materials and circular economy. One significant challenge is the physical separation of different types of plastics to obtain recyclates of one plastic type as pure as possible with comparable quality and properties to those of virgin mat...

Chemical chain extenders (CEs) can be used to restore the properties of recycled low-molecular-weight polyethylene tereph-thalate (PET). The aim of this work is to investigate the influence of the type and concentration of the CEs Joncryl and pyromellitic dianhydride (PMDA) on the viscosity and other rheological properties with a unique combination...

After cochlear implant (CI) insertion, there is a possibility of postoperative inflammation, which may involve proinflammatory markers such as interleukin-6. Detecting this inflammation promptly is crucial for administering anti-inflammatory drugs, if required. One potential method for detecting inflammation is using molecular imprinted polymers (M...

The sample mass during biomass pyrolysis in an thermogravimetric reactor is shown to influence the pyrolysis mechanism and properties of the resultant non-graphitizing carbon. There is an inflection mass scale beyond which this effect is minimal.

The increase in mineral and ash-rich waste biomass (MWB) generation in emerging economies poses critical environmental problems and bottlenecks the solid waste and wastewater treatment systems. Transforming these MWB such as sewage sludge from wastewater treatment (SSW) to biochar can be a sustainable method for their disposal and resource recovery...

The shells of walnuts (WS) are major refuse in the global fruits and nuts trade. This, otherwise discarded, lignin-rich material can be carbonized to biochar—a value-added product with environmental applications such as carbon sequestration, soil amelioration, and pollutant adsorption. These applications are dictated by structural and chemical char...

In various countries, polyethylene terephthalate (PET) represents one of the plastics with a very high recycling rate. Since currently there is no analytical method enabling direct distinction between recycled PET (rPET) and virgin PET (vPET), there are various attempts to differentiate these materials indirectly. One of these approaches claims tha...

The overall aim of this study is to evaluate application-oriented potential of biocomposites made of surface-modified flax fibers for use in engineering thermoplastics. The scope of the study includes analysis of the effect of a partially bio-based epoxy-coating, a silane treatment and a combined epoxy-coating / silane treatment of the flax fibers...

The purpose of this study is to review existing recycling technologies, standards and market situation for plastics recycling. The principal results show that mechanical recycling is the most well-developed recycling approach regarding technology transfer to industry. This approach enables development of plastic recyclates of various quality grades...

The purpose of this study is to review existing recycling technologies, standards and market situation for plastics recycling. The principal results show that mechanical recycling is the most well-developed recycling approach regarding technology transfer to industry. This ap-proach enables development of plastic recyclates of various quality grade...

The aim of this feasibility study is to develop application-oriented natural fiber-reinforced biocomposites with improved mechanical and durability performance. The biocomposites were manufactured via a film-stacking process of epoxy-coated flax textiles and polyamide 6 (PA6). The fabricated biocomposites were subjected to thermo-oxidative ageing f...

This feasibility study investigates the mechanical properties of novel hybrid biocomposites for lightweight applications, which include high content of components based on renewable feedstock and at the same time show high mechanical performance. In contrast to established synthetic hybrid composites containing different types of synthetic fibers i...

In the scope of this study woven flax fibers are coated with aqueous polyethyleneimine (PEI) solution, in order to improve the bending properties of the produced flax fiber-reinforced epoxy composite. The textiles are coated with the different concentrations of PEI solution and integrated into the biobased epoxy using hand impregnation with subsequ...

Auf der einen Seite wächst in der Kunststoffbranche an verschiedenen Stellen das Interesse an hochwertigen Rezyklaten, auf der anderen Seite klagen die Rezyklat-Anbieter über einen Mangel an Abnehmern. Ein wesentlicher Grund dafür ist das Fehlen verlässlicher und umfassender Qualitätsstandards für Rezyklate. Wenn es keine Vorgaben zur eindeutigen R...

Numerous research studies are carried out in order to investigate various properties and implement the potential of hybrid carbon/flax composites for technical applications. This review aims to present a summary of materials and manufacturing techniques, which are currently used for the fabrication of the carbon/flax composites, and describe the re...

An effective integration of natural fibers into engineering thermoplastics requires sufficient thermal stability of natural fibers during processing, since melting temperature of engineering thermoplastics lies above 200 °C. The aim of the work was to protect natural fibers from the heat of the molten thermoplastic via coating with a modified epoxy...

This feasibility study investigates the flexural properties of biocomposites containing woven flax textiles (plain, twill, satin) and woven twill patterned hybrid textiles containing flax-/glass or flax-/carbon mixture for lightweight applications. Synthetic fibers are integrated as weft and flax fibers are integrated as warp yarns using a double-r...

The aim of this work was to create a biocomposite material with controllable electrical resistance for lightweight engineering made from regenerated cellulose-based fibers and a partially biobased epoxy resin. In this feasibility study viscose fabrics were coated with polypyrrole (PPy) by in situ polymerization of pyrrole (Py) and iron(III)-chlorid...

Natural fiber-reinforced polymer composites have already been successfully established in various lightweight applications subjected to moderate mechanical stress, e.g. automotive interior. Recently, the development of biobased hybrid composites containing both, natural and high-performance fibers, gained the attention of research institutions and...

In this study flax fabrics were treated with polyethylene imine (PEI) and afterwards, in combination with carbon fabrics, integrated into epoxy resin via vacuum infusion process. The influence of the 2 stacking sequences of the fabrics and 2 PEI concentrations were evaluated with regard to the mass fractions of the composite components and mechanic...