Structural Characterization of Silica Particles Extracted from Grass<i>Stenotaphrum secundatum</i>: Biotransformation via Annelids

Espíndola-Gonzalez, A.; Fuentes‐Ramírez, Rosalba; Martínez-Hernández, Ana Laura; Castaño, V. M.; Velasco‐Santos, Carlos

doi:10.1155/2014/956945

Cited by 11 publications

(5 citation statements)

References 28 publications

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“…Silica, in its amorphous form, is found in a variety of organisms ranging from algae (diatoms) to plants and sponges, where it has functions that range from structural material, light harvesting, stress tolerance and others 1 – 3 . Biogenic silica displays morphological complexity 4 unmatched by current synthetic silica production techniques, it is deposited in the form of 30 to 100 nm particles 5 , 6 . Silica particles in nature are produced at ambient conditions, in an aqueous environment, aided by long chain polyamines (LCPA) 7 , 8 .…”

Section: Introductionmentioning

confidence: 99%

Chain length of bioinspired polyamines affects size and condensation of monodisperse silica particles

et al. 2021

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Polyamines play a major role in biosilicification reactions in diatoms and sponges. While the effects of polyamines on silicic acid oligomerization and precipitation are well known, the impact of polyamines chain length on silica particle growth is unclear. We studied the effects of polyamine chain length on silica particle growth and condensation in a known, simple, and salt-free biphasic reaction system; with tetraethyl orthosilicate as organic phase and polyamine dissolved in the aqueous phase. The particles at various growth stages were characterized by Cryo- Transmission Electron Microscopy, Scanning Electron Microscopy, Thermogravimetric Analysis, Zeta Potential, and solid-state NMR analysis. Polyamines were found co-localized within silica particles and the particle diameter increased with an increase in polyamine chain length, whereas silica condensation showed the opposite trend. Particle growth is proposed to progress via a coacervate intermediate while the final particles have a core shell structure with an amine-rich core and silica-rich shell. The results presented in this paper would of interest for researchers working in the field of bioinspired materials.

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Section: Introductionmentioning

confidence: 99%

Chain length of bioinspired polyamines affects size and condensation of monodisperse silica particles

et al. 2021

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“…Teresa and Dickon (2007) [29] demonstrated conversion of an inexpensive Luk Bamboo into biomorphic composites containing high-purity cristobalite-SiO 2 and β-silicon carbide (SiC) nanowires at different temperatures. Silica had been successfully extracted from Stenotaphrum secundatum (St. Augustine) grass using a process known as annelid-based biotransformation [30]. Athinarayanan et al (2020) uses Sorghum biocolor leaves as silicon precursor for the preparation of nanosilica by sequential processes [31].…”

Section: Introductionmentioning

confidence: 99%

Isolation and Characterization of Fibrillar Nanosilica of Floral Origin: Cortaderia selloana Flowers as the Silica Source

Shadiya

Dominic

Nandakumar³

et al. 2021

Silicon

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Herein we report a novel green chemical route by exploiting the vast and abundant flowers of Cortaderia selloana, known as 'pampass grass' for the isolation of nano silica fibers. To attain high-purity silica from these floras, leaching in hydrochloric acid of three varied normalities and running water treatment was conducted followed by air combustion. Highly pure, uniformly distributed fibrous (60-70 nm diameter) nanosilica was obtained when the acid concentration was 0.1 N, as optimized from Scanning electron microscopy and energy-dispersive X-ray spectroscopy studies. Brunauer-Emmett-Teller surface area analysis summarized that the isolated silica is of specific surface area of 126 m 2 /g. The actual morphology of isolated silica was rich in nano fibrillar channel network as revealed from HR-TEM analysis. This cost effective eco-benign pathway opens a new vista for utilization of bio-precursors as nanosilica source.

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“…Many processes can be used for preparing silica nano particles, including microwave hydrothermal processes [19], sol-gel processes [20], and combustion synthesis [21]. Most methods used to produce silica on a large scale involve the use of very high temperature processes (in proximity of 1300ºC), which are not only energyintensive but also may be hazardous to the environment due to large volumes of CO 2 gas production [22]. In general, it can be stated that a vast majority of methods that produce silica are energy-and time-intensive, produce low-purity silica, and are inefficient, thus requiring low energy consumption, low CO 2 generation, and a sustainable method of silica production -which cannot be overemphasized.…”

Section: Introductionmentioning

confidence: 99%

Synthesizing Nano Silica Nanoparticles from Barley Grain Waste: Effect of Temperature on Mechanical Properties

Akhayere¹,

Kavaz²,

Vaseashta³

2019

Pol. J. Environ. Stud.

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In this investigation we report the synthesis of nano silica (NS) nanoparticles from barley grass waste-an environmental burden-using varying temperatures during preparation. The temperatures used during the investigation were 400, 500, 600, and 700ºC, and we studied its effects on the mechanical properties of the NS nanoparticles for use in environmentally friendly applications. Furthermore, the NS nanoparticles resulting from high temperature synthesis were characterized using various characterization methodologies such as X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) analysis, Brunauer-Emmett-Teller (BET), Fourier transform infrared (FTIR) and X-ray fluorescence (XRF) spectrometry analysis. The result of the various characterizations revealed the presence of elemental Si, C, and O in the synthesized nanoparticles. Using XRF, we observed that higher amounts of SiO 2 particles from NS were obtained at 600ºC and 700ºC, also resulting in higher strength in the mechanical properties. Furthermore, using the Brunauer-Emmett-Teller (BET) methodology, we were able to measure the surface area corresponding to 150 m 2 /g. Additional methodologies were used, such as differential scanning calorimetric (DSC), thermo gravimetric analysis (TGA), SEM, and tensile analysis. The results of this study showed improved and stable mechanical properties with the increase in temperature during synthesis.

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Structural Characterization of Silica Particles Extracted from GrassStenotaphrum secundatum: Biotransformation via Annelids

Cited by 11 publications

References 28 publications

Chain length of bioinspired polyamines affects size and condensation of monodisperse silica particles

Chain length of bioinspired polyamines affects size and condensation of monodisperse silica particles

Isolation and Characterization of Fibrillar Nanosilica of Floral Origin: Cortaderia selloana Flowers as the Silica Source

Synthesizing Nano Silica Nanoparticles from Barley Grain Waste: Effect of Temperature on Mechanical Properties

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