Transparent bacterial cellulose nanocomposites used as substrate for organic light-emitting diodes

Legnani, Cristiano; Barud, Hernane S.; Caiut, José Maurício A.; Calil, Vanessa L.; Maciel, Indhira O.; Quirino, Welber G.; Ribeiro, Sidney J. L.; Cremona, Marco

doi:10.1007/s10854-019-00979-w

Cited by 23 publications

(35 citation statements)

References 32 publications

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“…[118] Legnani et al fabricated a multifunctional material based on bacterial cellulose and an organic-inorganic sol, composed of boehmite NPs and epoxy modified siloxane with an optical transmission of 88% as eco-friendly biocompatible substrate for flexible electronic applications. [119] Furthermore, haze can also influence the properties in OLEDs and can be beneficially used. A porous and transparent film made of cellulose acetate butyrate was fabricated as diffuser layer on the glass substrate for green phosphorescent microcavity OLEDs.…”

Section: Organic Light Emitting Diodesmentioning

confidence: 99%

Cellulose for Light Manipulation: Methods, Applications, and Prospects

Reimer

Zollfrank

2021

Advanced Energy Materials

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The colors of plants and animals can be achieved by different interactions of light with matter. [10][11][12][13][14][15][16][17] Animals or plants use the biological system colors as warning, for camouflage, or for signaling. Coloration can be generated by the selective absorption of light from the visible range of the spectrum by using pigments (pigmentary colors), which are absorbing subsets of the visible spectrum and transmitting and reflecting the other parts of the visible light. Therefore, the tissue occurs in the color of the wavelength of the reflected radiation. This is used for example by flowers of plants as a signal, because they have to stand out against the background of the vegetation in order to attract pollinating insects. Therefore, they appear in bright colors by reflecting certain wavelengths of visible light, which are then perceivable for the pollinating insects as well as for humans. [10][11][12][13] However, light-matter interaction with respect to absorption is of general importance, but will not be further discussed in this review. On the other hand, coloration can be created by coherent or incoherent scattering of light on highly structured and unstructured tissues (structural colors) in the range of the wavelength of incident light. Here, different wavelengths of light are selectively reflected from a structure and the remaining wavelengths can then be transmitted or absorbed. [10][11][12][13][14][15] These biological photonic sub-micrometer structures yield a distinct coloration through the creation of a refractive index contrast between the used materials. This is an interesting fact, because natural systems cannot be built on high-refractive index inorganic materials, which are commonly used in contemporary technology. Instead, nature makes use of biopolymers such as keratin, chitin, collagen, and cellulose. However, all of these biopolymers exhibit a refractive index around ≈1.5. In order to be able to create bright structural colors, a high refractive index contrast is required. Therefore, nature is using air voids to create the necessary refractive index contrast (Δn ≈ 0.5). Alternatively, nature can also use melanin with a refractive index of about 2 and keratin in mixed composites or by using anhydrous guanine with a refractive index of 1.83, whose crystal arrangements are responsible for the metallic luster of many fish. [15,16] Pigmentary color as well as structural color can also occur in combination (combined colors). All of these aspects can also be separated in iridescent or noniridescent colors. [10,15] Birds, like the Panama Amazon parrot (Amazona ochrocephala panamensis) or the kingfisher (Alcedo atthis) are using different combinations of pigments and sub-micrometer structured components.Cellulose is one of the most abundant biopolymers on earth. It is a sustainable and renewable raw material with many beneficial properties. Due to its availability, nontoxicity, environmental friendliness, biocompatibility, and biodegradability, cellulose is one of the world's most ...

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Section: Organic Light Emitting Diodesmentioning

confidence: 99%

Cellulose for Light Manipulation: Methods, Applications, and Prospects

Reimer

Zollfrank

2021

Advanced Energy Materials

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“…In a recent study, Legnani et al [121] produced multifunctional membranes based on BC and an organic-inorganic sol, composed of boehmite (Boe) nanoparticles and epoxy modified siloxane (GTPS), to be used as substrates in organic…”

Section: Brazilmentioning

confidence: 99%

Commercial and potential applications of bacterial cellulose in Brazil: ten years review

et al. 2020

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“…Nanocellulose fibers can form strong transparent films and porous dense aerogels, which offer attention to new areas such as biomedical and electronics. 10 Recently, bionanocomposites have been used in several applications such as biomedical (bone tissue regeneration, artificial blood vessels, and dura mater reconstruction), 11–14 electronic devices (display device, e-papers, flexible light-emitting diode, and head phone diaphragm), 15–17 packaging, 9,10 paper strength enhancement, 11 and coating and structure. 12–14…”

Section: Introductionmentioning

confidence: 99%

Variations in the mechanical properties of bionanocomposites by water absorption

Rana

Gupta

2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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The present study aims to investigate the water absorption property and its effect on the mechanical properties (i.e. tensile, flexural, and impact) of bionanocomposites. The epoxy-based bionanocomposites were prepared by reinforcing the epoxy with 1, 2, 3, 4, and 5 wt% of nanocellulose using in situ polymerization method. The maximum water uptake by bionanocomposites was measured; however, the water absorption behavior was not found in accordance with Fickian’s diffusion model. In the present study, very low water absorption in the range of 0.17–0.34% was offered by bionanocomposites. The results obtained from the present experimental study suggested that there were a maximum degradation of 14.96% in tensile strength, 26.44% in flexural strength, and 55.66% in impact strength for bionanocomposites reinforced with 5 wt% of nanocellulose by water uptake.

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Transparent bacterial cellulose nanocomposites used as substrate for organic light-emitting diodes

Cited by 23 publications

References 32 publications

Cellulose for Light Manipulation: Methods, Applications, and Prospects

Cellulose for Light Manipulation: Methods, Applications, and Prospects

Commercial and potential applications of bacterial cellulose in Brazil: ten years review

Variations in the mechanical properties of bionanocomposites by water absorption

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