Chemical and optical characterization of Psammodictyon panduriforme (Gregory) Mann comb nov (Bacillariophyta) frustules

Diatoms represent, in terms of species number, one of the largest groups of microalgae that have the ability to synthesize phenomenal mineral composites characterized by complex hierarchical structures. Their shells, called frustules, create intricately ornamented structures, reminiscent of the most sophisticated, natural mosaics. Ordinated pore systems perforate siliceous walls of the frustules with diameters ranging from nano to micro-scale, forming openwork three-dimensional silica structures. The use of these features is one of the main challenges in developing new technological solutions. In this study we assess the ability of selected diatom species (Pseudostaurosira trainorii) for metabolic insertion of soluble titanium from the culture medium into the structure of amorphous silica cell walls by its cultivation in laboratory conditions. The study is aimed at obtaining new and strengthening the already existing optical properties of diatomaceous biosilica. The physicochemical properties of the obtained materials have been studied using a series of instrumental methods.

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“…[ 115 ]. The last band, occurring at 443 cm −1 , is related to the Si-OH bending vibrations in the siloxane groups [ 105 , 111 , 113 , 116 ].…”

Section: Resultsmentioning

confidence: 99%

Metabolically Doping of 3D Diatomaceous Biosilica with Titanium

et al. 2022

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“…However, under pulse laser excitation, a single narrow emission peak was observed near 475 nm. This result was interpreted as the consequence of a putative quantum confinement effect due to the mesoporous silica and the quasi-regular pores in frustules structure (Camargo et al, 2016).…”

Section: Photoluminescencementioning

confidence: 93%

“…Recently, frustules from the pennate diatom Psammodictyon panduriforme were investigated under 325 nm laser excitation. Frustules showed two emission peaks at 417 and 534 nm that were considered as radiative luminescence generated by oxygenvacancy defects in the structure (Camargo et al, 2016). However, under pulse laser excitation, a single narrow emission peak was observed near 475 nm.…”

Section: Photoluminescencementioning

confidence: 99%

Optical Properties of Nanostructured Silica Structures From Marine Organisms

et al. 2018

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Light is important for the growth, behavior, and development of both phototrophic and autotrophic organisms. A large diversity of organisms used silica-based materials as internal and external structures. Nano-scaled well-organized silica biomaterials are characterized by a low refractive index and an extremely low absorption coefficient in the visible range, which make them interesting for optical studies. Recent studies on silica materials from glass sponges and diatoms, have pointed out very interesting optical properties, such as light waveguiding, diffraction, focusing, and photoluminescence. Light guiding and focusing have been shown to be coupled properties found in spicule of glass sponge or shells of diatoms. Moreover, most of these interesting studies have used purified biomaterials and the properties have addressed in non-aquatic environments, first in order to enhance the index contrast in the structure and second to enhance the spectral distribution. Although there is many evidences that silica biomaterials can present interesting optical properties that might be used for industrial purposes, it is important to emphases that the results were obtained from a few numbers of species. Due to the key roles of light for a large number of marine organisms, the development of experiments with living organisms along with field studies are require to better improve our understanding of the physiological and structural roles played by silica structures.

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“…Furthermore, TEM was utilized to investigate the micro‐ and nanoscale structures of diatom frustules P. trainorii and the porous structure and elemental composition of the frustules [43]. In addition, TEM was used to examine the surface morphology, microstructure, and crystal structures of the diatom Psammodictyon panduriforme [47]. Moreover, TEM was utilized to investigate the influence of varied Au‐NP loadings on to biosilica of Thalassiosira pseudonana [48].…”

Section: Characterization Of Biosilicamentioning

confidence: 99%

Diatom biosilica: Source, physical‐chemical characterization, modification, and application

Saoud

Sprynskyy

Pashaei

et al. 2022

J of Separation Science

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Growing research interest in the use of diatomaceous biosilica results from its unique properties such as chemical inertness, biocompatibility, high mechanical and thermal stability, low thermal conductivity, and homogeneous porous structure with a large specific surface. Unlike the production of synthetic silica materials with a micro‐ or nanoscale structure in an expensive conventional manufacturing process, diatomaceous biosilica can be produced in huge quantities without significant expenditure of energy and materials. This fact makes it an unlimited, easily accessible, natural, inexpensive, and renewable material. Moreover, the production of biosilica is extremely environmental friendly, as there is essentially no toxic waste and the process does not require more energy compared to the production of synthetic silica‐based materials. For all these reasons, diatoms are an intriguing alternative to synthetic materials in developing cheap biomaterials used in a different branches of industry. In this review, the state‐of‐art of biosilica materials, their characteristics approaches, and possible ways of application have been reported.

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Chemical and optical characterization of Psammodictyon panduriforme (Gregory) Mann comb nov (Bacillariophyta) frustules

Cited by 10 publications

References 21 publications

Metabolically Doping of 3D Diatomaceous Biosilica with Titanium

Metabolically Doping of 3D Diatomaceous Biosilica with Titanium

Optical Properties of Nanostructured Silica Structures From Marine Organisms

Diatom biosilica: Source, physical‐chemical characterization, modification, and application

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