What are the ranges and basis of auxeticity in the phases of cellulose microfibrils?

2017 ◽  
Author(s):  
Akwasi Asamoah
Keyword(s):  
Bacterial Cellulose ◽  
Raman Spectra ◽  
Laser Power ◽  
Microfibrillated Cellulose ◽  
Glass Slide ◽  
Flax Fibre ◽  
Cellulose Microfibrils

<p>One sample of 1D bundle of cellulose microfibrils in the form of lignified flax fibre (0.10526 mm x 10 mm), and one 2D networks of cellulose microfibrils in the form of tunicate cellulose (0.07 mm x 5 mm x 10 mm), bacterial cellulose (0.135 mm x 5 mm x 10 mm) and microfibrillated cellulose (0.08 mm x 5 mm x 10 mm) were put on a glass slide parallel to the principal spectrometer axis. Raman spectra were measured all round in-plane under both half (in 5° steps) polarisation from 0° to 360° in extended mode between 100 cm<sup>-1</sup> and 1150 cm<sup>-1</sup> in 3 accumulations at 10s exposure and 100% laser power. The cursor was placed at the peak of the 1095 cm<sup>-1</sup> band, and intensity read.</p>

What are the ranges and basis of auxeticity in the phases of cellulose microfibrils?

2017 ◽  
Author(s):  
Akwasi Asamoah
Keyword(s):  
Bacterial Cellulose ◽  
Raman Spectra ◽  
Laser Power ◽  
Microfibrillated Cellulose ◽  
Glass Slide ◽  
Flax Fibre ◽  
Cellulose Microfibrils

<p>One sample of 1D bundle of cellulose microfibrils in the form of lignified flax fibre (0.10526 mm x 10 mm), and one 2D networks of cellulose microfibrils in the form of tunicate cellulose (0.07 mm x 5 mm x 10 mm), bacterial cellulose (0.135 mm x 5 mm x 10 mm) and microfibrillated cellulose (0.08 mm x 5 mm x 10 mm) were put on a glass slide parallel to the principal spectrometer axis. Raman spectra were measured all round in-plane under both half (in 5° steps) polarisation from 0° to 360° in extended mode between 100 cm<sup>-1</sup> and 1150 cm<sup>-1</sup> in 3 accumulations at 10s exposure and 100% laser power. The cursor was placed at the peak of the 1095 cm<sup>-1</sup> band, and intensity read.</p>

scholarly journals Laser power influence on Raman spectra of multilayer graphene, multilayer graphene oxide and reduced multilayer graphene oxide

2018 ◽  
Vol 1143 ◽  
pp. 012020 ◽  
Author(s):  
H Ferreira ◽  
G Poma ◽  
D R Acosta ◽  
J Barzola-Quiquia ◽  
M Quintana ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Raman Spectra ◽  
Laser Power ◽  
Multilayer Graphene

Bacterial Cellulose Reinforced Flax Fibre Composites: Effect of Nanocellulose Loading on Composite Properties

2015 ◽  
Vol 825-826 ◽  
pp. 1063-1067
Author(s):  
Marta Fortea-Verdejo ◽  
Elias Bumbaris ◽  
Koon Yang Lee ◽  
Alexander Bismarck
Keyword(s):  
Tensile Strength ◽  
Bacterial Cellulose ◽  
Flax Fibre ◽  
The Other ◽  
Cellulose Content ◽  
Polypropylene Composites ◽  
Flax Fibres ◽  
Paper Making ◽  
Fibre Composites ◽  
Composite Properties

Loose hierarchical flax fibres/polypropylene composites were manufactured in a simple way based on a paper-making process in order to include nanocellulose and allow the hornification of the nanofibres in a controlled manner. The effect of flax fibre content on the flax/polypropylene composites and the influence of nanocellulose on the properties of these composites are discussed. By increasing the flax content a slight decrease of the tensile strength and an increase of the Young´s modulus were observed. On the other hand, no significant effect was noticed when increasing the bacterial cellulose content in the composites.

scholarly journals Bacterial Cellulose Based Biocomposite from Guava Fruit Reinforced with Bamboo Microfibrillated Cellulose Through Impregnation Method

2019 ◽  
Vol 35 (3) ◽  
pp. 1029-1036
Author(s):  
S. Silviana ◽  
Siti Susanti
Keyword(s):  
Thermal Stability ◽  
Tensile Strength ◽  
Bacterial Cellulose ◽  
Microfibrillated Cellulose ◽  
Impregnation Method ◽  
Optimal Conditions ◽  
Good Thermal Stability ◽  
Guava Fruit ◽  
Mechanical Tensile ◽  
Tga Analysis

Commercial plastics synthesized from fossil oil can significantly affect the environment due to its non-biodegradable property. It is an attempt to minimize the use of the plastics substituted with biodegradable plastics such as biocomposite. Biocomposite matrix can be synthesized from cellulose. A potential cellulose source can be obtained from bacterial cellulose. The bacterial cellulose observed in this study was extracted from guava. Bamboo microfibrillated cellulose was used as reinforcement agent. The objectives of this paper are to obtain optimum condition of bacterial cellulose from guava reinforced with microfibrillated cellulose of bamboo and to identify the characteristics of the biocomposite product such as its mechanical (tensile strength), morphological (SEM), thermal (DSC and TGA) and structural properties (FTIR and TGA). The results show that optimal conditions of the modified biocomposite was achieved at 5%-w/v of bamboo microfibrillated cellulose with tensile strength of 59.81±4.81 MPa. Furthermore, the biocomposite had good thermal stability. It was confirmed by TGA analysis with glass transition temperature of 150°C higher than that of guava bacterial cellulose without the reinforcement of bamboo microfibrillated cellulose, i.e at 110°C.

scholarly journals The elimination of the influence of laser power instability on registration accuracy of Raman spectra of biopolymers

1990 ◽  
Vol 6 (4) ◽  
pp. 105-107 ◽  
Author(s):  
D. N. Govorun ◽  
I. V. Kondratyuk ◽  
Ya. R. Mishchuk ◽  
N. V. Zheltovsky
Keyword(s):  
Raman Spectra ◽  
Laser Power ◽  
Registration Accuracy ◽  
Power Instability

Biocomposite of bacterial cellulose based from yam bean (Pachyrhizus erosus L. Urban) reinforced by bamboo microfibrillated cellulose through in situ method

2020 ◽  
Author(s):  
Silviana Silviana ◽  
Ernisa Ismirani Khusna ◽  
Giver Adriel Hagnos Susanto ◽  
Gelbert Jethro Sanyoto ◽  
H. Hadiyanto
Keyword(s):  
Bacterial Cellulose ◽  
Microfibrillated Cellulose ◽  
In Situ Method ◽  
Pachyrhizus Erosus

scholarly journals Composite Gels Containing Whey Protein Fibrils and Bacterial Cellulose Microfibrils

2019 ◽  
Vol 84 (5) ◽  
pp. 1094-1103 ◽  
Author(s):  
Jinfeng Peng ◽  
Vincenzo Calabrese ◽  
Julia Geurtz ◽  
Krassimir P. Velikov ◽  
Paul Venema ◽  
...  
Keyword(s):  
Bacterial Cellulose ◽  
Whey Protein ◽  
Cellulose Microfibrils ◽  
Composite Gels ◽  
Protein Fibrils

Temperature and laser-power dependent Raman spectra of MoS2/RGO hybrid and few-layered MoS2

2020 ◽  
pp. 412693
Author(s):  
Pengfei Shen ◽  
Xigui Yang ◽  
Mingrun Du ◽  
Huafang Zhang
Keyword(s):  
Raman Spectra ◽  
Laser Power ◽  
Layered Mos2

The structure of spherulites of bacterial cellulose from Acetobacter xylinum

1974 ◽  
Vol 20 (4) ◽  
pp. 509-512 ◽  
Author(s):  
L. C. Sowden ◽  
J. Ross Colvin
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Bacterial Cellulose ◽  
Acetobacter Xylinum ◽  
Cellulose Microfibrils ◽  
Polarizing Microscopy ◽  
Scanning Electron

Evidence from phase and polarizing microscopy as well as scanning electron microscopy indicates that the cellulose microfibrils in the spherulites of bacterial cellulose are oriented tangentially, not radially. Also, the orientation may be limited to only a fraction of the thickness of the pellicle. It is suggested that the tangential deposition may be caused by a gradient of concentration of a weakly soluble inhibitor of cellulose formation about a center.

Deformation of Cotton and Bacterial Cellulose Microfibrils

1975 ◽  
Vol 45 (7) ◽  
pp. 568-572 ◽  
Author(s):  
F.J. Kolpak ◽  
J. Blackwell
Keyword(s):  
Bacterial Cellulose ◽  
Cellulose Microfibrils
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