Morphology and Structure of Biomorphous Silica Isolated from Equisetum hyemale and Equisetum telmateia

Neumann, Mike; Wagner, Sandra; Nöske, Robert; Tiersch, Brigitte; Strauch, Peter

doi:10.1515/znb-2010-0910

Cited by 10 publications

(5 citation statements)

References 3 publications

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“…The maximum rate of lignocellulosic material decomposition was observed at 320 • C (peak maximum on the DTG curve), at this temperature lignin and cellulose were most intensively decomposed. At higher temperatures (>400 • C) further slow decomposition of lignin could occur, which was inhibited at above 500 • C. The solid residue after the pyrolysis process was ~30%, with a high proportion of silica [35].…”

Section: Thermogravimetric Analysis (Tga) Of the Fillermentioning

confidence: 99%

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Horsetail (Equisetum Arvense) as a Functional Filler for Natural Rubber Biocomposites

et al. 2020

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Over the past decades, increased scientific and research activity has been observed in the development of new, innovative materials for various end uses. This is mainly due to the growing ecological, environmental, and material awareness of many industries and societies. Equisteum arvense-horsetail is a plant that has demonstrated its properties in pharmacological and clinical aspects as well as in vitro and in vivo biological activity. This article presents a new method of using horsetail as a natural, lignocellulosic filler for a natural rubber matrix. In-depth characteristics of the applied bio-additive were prepared based on several research techniques and methods such as ultraviolet-visible spectroscopy, Fourier-transform infrared spectroscopy, scanning electron microscopy with energy dispersive X-RAY spectroscopy, thermogravimetric analysis, and flame atomic absorption spectroscopy. Elastomer composites were prepared as a function of horsetail content. Then, an analysis of their main functional properties was performed, including mechanical properties and susceptibility to accelerated aging processes such as thermo-oxidative, ultraviolet radiation, and weathering. The research emphasizes the significant value of horsetail in its new role—as an active filler of elastomer biocomposites. The obtained results confirmed that horsetail is lignocellulosic material thermally stable up to 180 °C. Horsetail is an active filler to natural rubber, positively affecting mechanical strength. Due to the presence of flavonoids and phenolic acids in horsetail, it can be used as a polymer anti-aging agent.

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Section: Thermogravimetric Analysis (Tga) Of the Fillermentioning

confidence: 99%

“…At higher temperatures (>400 °C) further slow decomposition of lignin could occur, which was inhibited at above 500 °C. The solid residue after the pyrolysis process was ~30%, with a high proportion of silica [35].…”

Section: Thermogravimetric Analysis (Tga) Of the Fillermentioning

confidence: 99%

Horsetail (Equisetum Arvense) as a Functional Filler for Natural Rubber Biocomposites

et al. 2020

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“…Relative to dry mass, Equisetum genus plants may contain silica from 0.1% to 25%, carbon in up to 40%, besides other elements such as sodium, calcium, potassium, magnesium, phosphorus, iron and zinc in high percentages, all of them of industrial relevance [19,[21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

“…The solubilization processes of plant silica have many steps like burning, the addition of base (pH >10), followed by the addition of acid [16,[22][23][24]. In order to increase the purity level of the silica and other derivatives, several authors introduce steps prior to burning and/or base solubilization such as leaching with hydrochloric acid or citric acid to remove the Na, K, Mg, Ca, Fe, Zn ions, and ammonia solubilization of the persistent ions Na, Cl, P, and S [15,16,22,24,25].…”

Section: Introductionmentioning

confidence: 99%

Equisetum Hyemale - Derived Unprecedented Bioactive Composite for Hard and Soft Tissues Engineering

Silva

Diniz

Gomes

et al. 2021

Preprint

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Although Bioactive Glasses (BG) has been progressively optimized, their preparation still uses toxic reagents and calcination at high temperatures to remove organic solvents. The drawbacks related to the BG synthesis were overcome by treating the ashes from the Equisetum hyemale plant in an ethanol/water solution to develop a bioactive composite [glass/carbon (BG-Carb)]. The BG-Carb was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and its chemical composition was assessed by inductively coupled plasma – optical emission spectroscopy (ICP-OES). Brunauer-Emmett-Teller (BET) gas adsorption analysis showed a specific surface area of 121 m2 g-1. The formation of hydroxyapatite (HA) surface layer in vitro was confirmed by Fourier-transform infrared spectroscopy (FTIR)analyse before and after immersion in simulated body fluid (SBF) solution. The Rietveld refinement of the XRD patterns and selected area electron diffraction (SAED) analyses confirmed HA in the sample before the immersion in SBF solution and after immersion in SBF solution; and increase of the HA layer on the sample surface, after the immersion in SBF solution. The BG-Carb samples showed no cytotoxicity on MC3T3-E1 cells and osteo-differentiation capacity similar to the positive control. Altogether, the BG-Carb material data reveals a promising plant waste-based candidate for hard and soft tissue engineering.

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“…Living organisms utilize inorganic materials (biominerals), such as silicon and calcium, in their components. Silicon, which is ubiquitous in soil, is taken up by plants in the form of various soluble compounds, such as S i (OH) 4 .Silica bodies of Oryza 1 – 3 and Equisetaceae 4 – 6 have been studied to determine where in the plant they occur and their physiological function.…”

Section: Introductionmentioning

confidence: 99%

Strategy of optical path of daylight signal into tissues in cold-season turfgrasses using small, concave silica bodies

Yamanaka

Usami

Kakegawa

et al. 2018

Sci Rep

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Plants incorporate inorganic materials (biominerals), such as silica, into their various components. Plants belonging to the order Poales, like rice plants and turfgrasses, show comparatively high rates of silicon accumulation, mainly in the form of silica bodies. This work aims to determine the shapes and roles of these silica bodies by microscopic observation and optical simulation. We have previously found convex silica bodies on the leaves of rice plants and hot-season turfgrasses (adapted to hot-seasons). These silica bodies enabled light reflection and ensured reduction of the photonic density of states, which presumably prevented the leaves from overheating, as suggested by theoretical optical analyses. The silica bodies have been considered to have the functions of reinforcement of the plant body. The present work deals with cold-season turfgrasses, which were found to have markedly different silica bodies, cuboids with a concave top surface. They presumably acted as small windows for introducing light into the tissues, including the vascular bundles in the leaves. The area of the silica bodies was calculated to be about 5% of the total surface area of epidermis, which limits the thermal radiation of the silica bodies. We found that the light signal introduced through the silica bodies diffused in the organs even reaching the vascular bundles, the physiological functions of this phenomena remain as future problems. Light signal in this case is not related with energy which heat the plant but sensing outer circumstances to respond to them.

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Morphology and Structure of Biomorphous Silica Isolated from Equisetum hyemale and Equisetum telmateia

Cited by 10 publications

References 3 publications

Horsetail (Equisetum Arvense) as a Functional Filler for Natural Rubber Biocomposites

Horsetail (Equisetum Arvense) as a Functional Filler for Natural Rubber Biocomposites

Equisetum Hyemale - Derived Unprecedented Bioactive Composite for Hard and Soft Tissues Engineering

Strategy of optical path of daylight signal into tissues in cold-season turfgrasses using small, concave silica bodies

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