Biogenic Composite Filaments Based on Polylactide and Diatomaceous Earth for 3D Printing

Dobrosielska, Marta; Przekop, Robert E.; Sztorch, Bogna; Brząkalski, Dariusz; Zgłobicka, Izabela; Łępicka, Magdalena; Dobosz, Romuald; Kurzydłowski, Krzysztof J.

doi:10.3390/ma13204632

Cited by 22 publications

(22 citation statements)

References 24 publications

(23 reference statements)

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“…According to our previous research, for the species of diatoms used for this study, the particles smaller than 6 µm can be attributed to broken frustules (pieces thereof), while particles larger than approx. 40 µm are mostly agglomerates or colonies of frustules, as well as some single specimens of a bigger size [ 22 ]. It was observed that fraction 3 obtained by sedimentation of diatomaceous earth shows much narrower distribution of particle size, ranging from approx.…”

Section: Resultsmentioning

confidence: 99%

“…We also observed an additional band at a wavelength of 797 cm −1 , which is caused by symmetric bending vibrations of Si–O–Si bonds [ 27 ]. The band at 1646 cm −1 is due to bending vibrations of H–O–H bonds of bound molecular water [ 22 ]. We additionally observed bands at a wavelength of 1015 cm −1 , which could be attributed to the asymmetric stretching of Si–O–Si bond, while the 661 cm −1 belong to symmetric stretching [ 28 ].…”

Section: Resultsmentioning

confidence: 99%

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A New Method of Diatomaceous Earth Fractionation—A Bio-Raw Material Source for Epoxy-Based Composites

et al. 2021

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The authors of this paper use an original method of diatomaceous earth fractionation, which allows for obtaining a filler with a specific particle size distribution. The method makes it possible to separate small, disintegrated and broken diatom frustules from those which maintained their original form in diatomaceous earth. The study covers a range of tests conducted to prove that such a separated diatomic fraction (3–30 µm) shows features different from the base diatomite (from 1 to above 40 µm) used as an epoxy resin filler. We have examined the mechanical properties of a series of diatomite/resin composites, considering the weight fraction of diatoms and the parameters of the composite production process. The studied composites of Epidian 601 epoxy resin cross-linked with amine-based curing agent Z-1 contained 0 to 70% vol. of diatoms or diatomaceous earth. Samples were produced by being casted into silicone molds in vacuum degassing conditions and, alternatively, without degassing. The results have shown that the size and morphology of the filler based on diatomaceous earth affects mechanical and rheological properties of systems based on epoxy resin. Elongation at rupture and flexural stress at rupture were both raised by up to 35%, and impact strength by up to 25%.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

A New Method of Diatomaceous Earth Fractionation—A Bio-Raw Material Source for Epoxy-Based Composites

et al. 2021

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Section: Particle Size Measurements By Dynamic Light Scattering (mentioning

confidence: 99%

A New Method of Diatomaceous Earth Fractionation - A Bio-Raw Material Source for Epoxy-Based Composites

Dobrosielska¹,

Dobrucka²,

Gloc³

et al. 2021

Preprint

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The authors of this paper use an original method of diatomaceous earth fractionation, which allows for obtaining a filler with a specific particle size distribution. The method makes it possible to separate small, disintegrated and broken diatom frustules from those which maintained their original form in diatomaceous earth. The study covers a range of tests conducted to prove that such a separated diatomic fraction shows features different from the base diatomite used as an epoxy resin filler. We have examined mechanical properties of a series of diatomite/resin composites considering the weight fraction of diatoms and the parameters of the composite production process. The studied composites of Epidian 601 epoxy resin cross-linked with amine-based curing agent Z-1 contained 0 to 70% vol. of diatoms or diatomaceous earth. Samples were produced by casting into silicone moulds in vacuum degassing conditions and, alternatively, without degassing. The results have shown that the size and morphology of the filler based on diatomaceous earth affects mechanical and rheological properties of systems based on epoxy resin.

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“…Currently, two other groups of fixing materials are available for resorbable osteosynthesis in mandibular condylar fractures: polymers and metal alloys. Because of the promising chemical properties [ 20 ], a series of polylactide fixing materials [ 21 , 22 ] dedicated for that purpose (pins, screws, and meshes) have been developed in the last two decades. Their physical properties require some compromise in bone fragment fixation.…”

Section: Introductionmentioning

confidence: 99%

Change in Pull-Out Force during Resorption of Magnesium Compression Screws for Osteosynthesis of Mandibular Condylar Fractures

Kozakiewicz

2021

Materials

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Background: Magnesium has been used as degradable fixation material for osteosynthesis, but it seems that mechanical strength is still a current issue in these fixations. The aim of this study was to evaluate the axial pull-out force of compression headless screws made of magnesium alloy during their resorption. Methods: The tests included screws made for osteosynthesis of the mandible head: 2.2 mm diameter magnesium alloy MgYREZr (42 screws) and 2.5 mm diameter polylactic-co-glycolic acid (PLGA) (42 pieces, control). The screws were resorbed in Sørensen’s buffer for 2, 4, 8, 12, and 16 weeks, and force was measured as the screw was pulled out from the polyurethane block. Results: The force needed to pull the screw out was significantly higher for MgYREZr screws than for PLGA ones (p < 0.01). Within eight weeks, the pull-out force for MgYREZr significantly decreased to one third of its initial value (p < 0.01). The dynamics of this decrease were greater than those of the pull-out force for PLGA screws (p < 0.05). After these eight weeks, the values for metal and polymer screws equalized. It seems that the described reduction of force requires taking into account when using magnesium screws. This will provide more stable resorbable metallic osteosynthesis.

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Biogenic Composite Filaments Based on Polylactide and Diatomaceous Earth for 3D Printing

Cited by 22 publications

References 24 publications

A New Method of Diatomaceous Earth Fractionation—A Bio-Raw Material Source for Epoxy-Based Composites

A New Method of Diatomaceous Earth Fractionation—A Bio-Raw Material Source for Epoxy-Based Composites

A New Method of Diatomaceous Earth Fractionation - A Bio-Raw Material Source for Epoxy-Based Composites

Change in Pull-Out Force during Resorption of Magnesium Compression Screws for Osteosynthesis of Mandibular Condylar Fractures

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