Preparation, thermal characterization, and DFT study of the bacterial cellulose

Salvi, Denise Toledo Bonemer De; Barud, Hernane da Silva; Treu-Filho, Oswaldo; Pawlicka, Agnieszka; Mattos, R. I.; Raphael, Ellen; Ribeiro, Sidney José Lima

doi:10.1007/s10973-014-3969-y

Cited by 16 publications

(8 citation statements)

References 26 publications

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“…Biosynthesis of BC and EPE/BC Biocomposites. BC culture medium was prepared according to a method described previously by De Salvi et al 38 The control culture medium was similar to HS medium and contains D-glucose, yeast extract, magnesium sulfate heptahydrate (MgSO 4 •7H 2 O), potassium phosphate monobasic (KH 2 PO 4 ), ethanol, and purified water. Analytical grade chemicals were used as received.…”

Section: Methodsmentioning

confidence: 99%

Nano- and Macroscale Structural and Mechanical Properties of in Situ Synthesized Bacterial Cellulose/PEO-b-PPO-b-PEO Biocomposites

Tercjak

Gutierrez

Barud

et al. 2015

ACS Appl. Mater. Interfaces

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Highly transparent biocomposite based on bacterial cellulose (BC) mat modified with poly(ethylene oxide-b-propylene oxide-b-ethylene oxide) block copolymer (EPE) were fabricated in situ during biosynthesis of bacterial cellulose in a static culture from Gluconacetobacter xylinum. The effect of the addition to the culture medium of water-soluble EPE block copolymer on structure, morphology, crystallinity, and final properties of the novel biocomposites was investigated at nano- and macroscale. High compatibility between components was confirmed by ATR-FTIR indicating hydrogen bond formation between the OH group of BC and the PEO block of EPE block copolymer. Structural properties of EPE/BC biocomposites showed a strong effect of EPE block copolymer on the morphology of the BC mats. Thus, the increase of the EPE block copolymer content lead to the generation of spherulites of PEO block, clearly visualized using AFM and MO technique, changing crystallinity of the final EPE/BC biocomposites investigated by XRD. Generally, EPE/BC biocomposites maintain thermal stability and mechanical properties of the BC mat being 1 wt % EPE/BC biocomposite material with the best properties. Biosynthesis of EPE/BC composites open new strategy to the utilization of water-soluble block copolymers in the preparation of BC mat based biocomposites with tunable properties.

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Section: Methodsmentioning

confidence: 99%

Nano- and Macroscale Structural and Mechanical Properties of in Situ Synthesized Bacterial Cellulose/PEO-b-PPO-b-PEO Biocomposites

Tercjak

Gutierrez

Barud

et al. 2015

ACS Appl. Mater. Interfaces

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“…While the 380 cm −1 band is shifted with the lowest rate, followed by the 1095 cm −1 band and with almost the same rate the band at 1411 and 459 cm −1 . Based on the density functional theory (DFT) band assignments the 380 cm −1 is assigned to OH-vibrations ( 200 , 201 ), while the band at 1425 cm −1 involves OH but also CH wagging ( 60 , 200 ), as illustrated in Figure 11C . Thus the lower shift of the 380 cm −1 band might reflect a loosening of the hydrogen network at some places, which also slightly affects the load on the main axis reflected by the 1095 cm −1 band ( Figure 11B-C ).…”

Section: In-situ Studies: Probing Plant Cell Wall Changesmentioning

confidence: 99%

New insights into plant cell walls by vibrational microspectroscopy

Gierlinger

2017

Applied Spectroscopy Reviews

111

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Vibrational spectroscopy provides non-destructively the molecular fingerprint of plant cells in the native state. In combination with microscopy, the chemical composition can be followed in context with the microstructure, and due to the non-destructive application, in-situ studies of changes during, e.g., degradation or mechanical load are possible. The two complementary vibrational microspectroscopic approaches, Fourier-Transform Infrared (FT-IR) Microspectroscopy and Confocal Raman spectroscopy, are based on different physical principles and the resulting different drawbacks and advantages in plant applications are reviewed. Examples for FT-IR and Raman microscopy applications on plant cell walls, including imaging as well as in-situ studies, are shown to have high potential to get a deeper understanding of structure–function relationships as well as biological processes and technical treatments. Both probe numerous different molecular vibrations of all components at once and thus result in spectra with many overlapping bands, a challenge for assignment and interpretation. With the help of multivariate unmixing methods (e.g., vertex components analysis), the most pure components can be revealed and their distribution mapped, even tiny layers and structures (250 nm). Instrumental as well as data analysis progresses make both microspectroscopic methods more and more promising tools in plant cell wall research.

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“…BC culture medium was prepared according to the method previously reported by us (De Salvi et al, 2014;Tercjak et al, 2015). 45 mL of culture medium and 5 mL of the inoculum was cultivated during 3 days in static conditions at 28 • C in a 250 mL Erlenmeyer flask in an air circulating oven.…”

Section: Biosynthesis Of Bacterial Cellulosementioning

confidence: 99%

Switchable photoluminescence liquid crystal coated bacterial cellulose films with conductive response

Tercjak

Gutierrez

Barud

et al. 2016

Carbohydrate Polymers

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Three different low molecular weight nematic liquid crystals (LCs) were used to impregnate bacterial cellulose (BC) film. This simple fabrication pathway allows to obtain highly transparent BC based films. The coating of BC film with different liquid crystals changed transmittance spectra in ultraviolet-visible region and allows to design UVC and UVB shielding materials. Atomic force microscopy results confirmed that liquid crystals coated BC films maintain highly interconnected three-dimensional network characteristic of BC film and simultaneously, transversal cross-section scanning electron microscopy images indicated penetration of liquid crystals through the three-dimensional network of BC nanofibers. Investigated BC films maintain nematic liquid crystal properties being switchable photoluminiscence as a function of temperature during repeatable heating/cooling cycles. Conductive response of the liquid crystal coated BC films was proved by tunneling atomic force microscopy measurement. Moreover, liquid crystal coated BC films maintain thermal stability and mechanical properties of the BC film. Designed thermoresponsive materials possessed interesting optical and conductive properties opening a novel simple pathway of fabrication liquid crystal coated BC films with tuneable properties.

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Preparation, thermal characterization, and DFT study of the bacterial cellulose

Cited by 16 publications

References 26 publications

Nano- and Macroscale Structural and Mechanical Properties of in Situ Synthesized Bacterial Cellulose/PEO-b-PPO-b-PEO Biocomposites

Nano- and Macroscale Structural and Mechanical Properties of in Situ Synthesized Bacterial Cellulose/PEO-b-PPO-b-PEO Biocomposites

New insights into plant cell walls by vibrational microspectroscopy

Switchable photoluminescence liquid crystal coated bacterial cellulose films with conductive response

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