Bacterial cellulose–silica organic–inorganic hybrids

Barud, Hernane S.; Assunção, Rosana Maria Nascimento de; Martines, Marco Antônio Utrera; Dexpert‐Ghys, Jeannette; Marques, Rodrigo Fernando Costa; Messaddeq, Younès; Ribeiro, Sidney J. L.

doi:10.1007/s10971-007-1669-9

Cited by 121 publications

(71 citation statements)

References 19 publications

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“…29 Similarly, curves (iii) and (iv) for the BC-silica samples show a first stage of superficial water evaporation from the membrane between 80 and 100 C followed by two stages of BC decomposition. It is observed that the thermal stability of the BC membranes around 300 C is increased with addition of the silica NPs, which improve the stability of RL emission, minimizing thermal damage due to high pumping fluences.…”

Section: Resultsmentioning

confidence: 83%

“…Spherical silica NPs are observed attached to the network formed by BC microfibrils. 29 From the SEM images, we deduced that the membranes play the role of a tridimensional network to support the silica NPs. Additionally, no changes in the morphology or microstructure of BC membranes are observed after the synthesis.…”

Section: Resultsmentioning

confidence: 97%

“…These spectral changes may be due to hydrogen bonds formation between hydroxyls groups from bacterial cellulose and the silica nanoparticles. 29 For the samples containing Ag NPs, another characterization procedure was employed. Fig.…”

Section: Resultsmentioning

confidence: 99%

“…29. Silica NPs were chosen as scatterers because the photodegradation of the laser-dye molecules is smaller than it is observed using TiO 2 NPs when excitation lasers operating in the green range are used.…”

Section: Methodsmentioning

confidence: 99%

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Random laser action from flexible biocellulose-based device

Santos

Dominguez

Schiavon

et al. 2014

Journal of Applied Physics

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A flexible organic random laser based on poly(9,9-dioctylfluorene) deposited on a surface corrugated polyphthalate-carbonate substrate Appl. Phys. Lett. 98, 253304 (2011) We demonstrate random lasing action in flexible bacterial cellulose (BC) membrane containing a laser-dye and either dielectric or metallic nanoparticles (NPs). The novel random laser system consists of BC nanofibers attached with Rhodamine 6G molecules and having incorporated either silica or silver NPs. The laser action was obtained by excitation of the samples with a 6 ns pulsed laser at 532 nm. Minimum laser threshold of %0.7 mJ/pulse was measured for the samples with silica NPs, whereas a laser threshold of 2.5 mJ/pulse for a system based on silver NPs was obtained. In both cases a linewidth narrowing from %50 to %4 nm was observed. Potential applications in biophotonics and life sciences are discussed for this proof-of-concept device. V C 2014 AIP Publishing LLC. [http://dx

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Section: Resultsmentioning

confidence: 83%

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Random laser action from flexible biocellulose-based device

Santos

Dominguez

Schiavon

et al. 2014

Journal of Applied Physics

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“…The mixture continued to be stirred for 15 min. The reaction was allowed to proceed for 24 h. The resulting product was washed repeatedly with deionized water to obtain BC/SiO2 composites by freeze drying (Zheng et al 2007;Barud et al 2008;Cai and Kim 2010;Zeng et al 2011).…”

Section: Preparation Of Bc/sio2 Hybrid Materialsmentioning

confidence: 99%

Bacterial Cellulose and Silica Hybrid Reinforcements in Poly-(vinylidene fluoride) Composite Membranes

Zhao¹,

Yu²

2014

BioResources

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Poly-(vinylidene fluoride) (PVDF), which has a low surface energy, is a common material used for ultrafiltration (UF) membranes. Bacterial cellulose (BC) contains a large number of hydroxyl groups, which has a strong water holding capacity. It can improve the hydrophilicity of PVDF. By means of in-situ composite preparation, with the introduction of tetraethoxysilane (TEOS) as silicon source from the outside of BC and polymerizing, hybrid reinforcing material comprised of BC and silica (BC/SiO2) was achieved which were catalyzed by different acids. After that, by means of a phase separation method with PVDF, composite membranes (PVDF/BC/SiO2) were prepared. Visible spectrophotometry, thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) were used to investigate the characteristic of BC/SiO2 hybrids. The structure and properties of composite membranes were also investigated. After catalysis by acid, SiO2 particles uniformly adhered to the surface of BC fibers, which resulted in small pores being formed preferentially in the interface of PVDF composite membranes, while reducing the finger-like pores. At the same time the retention of the composite membranes were improved. So both the properties and structure were improved due to the presence of certain BC/SiO2 hybrid reinforcements.

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