Effect of Oxygen Plasma Treatment on Bacterial Cellulose-Alginate Composite Sponge as a Yeast Cell Carrier for Ethanol Fermentation

A bacterial cellulose-alginate composite sponge (BCA) was developed for use as a cell carrier in ethanol fermentation. Its hydrophilicity was improved by oxygen plasma treatment. Due to the etching effect in plasma application, the external surface roughness of treated BCA was increased, resulting in a decrease of advancing water contact angle. However, oxygen plasma treatment might not be able to create sufficient hydrophilic functional groups on the internal pore surface of BCA, where the yeast cells would be immobilized during fermentation. As a result, under batch fermentation, no significant difference in ethanol production obtained from the immobilized cell systems using the treated and untreated BCAs.

Download Full-text

Surface Modification of 3D-Poly(glycerol-sebacate)/ Poly(L-lactic-acid) Porous Scaffolds by Oxygen Plasma Enhances Proliferation and Differentiation of Goat Temporomandibular Joint Disc Cells

Journal of Biomaterials and Tissue Engineering ◽

10.1166/jbt.2019.2208 ◽

2019 ◽

Vol 9 (12) ◽

pp. 1653-1661

Author(s):

Tiandong Cao ◽

Fangrui Dong ◽

Pengfei Zhang ◽

Jingying Liu ◽

Zhe Xing ◽

...

Keyword(s):

Lactic Acid ◽

Plasma Treatment ◽

Temporomandibular Joint ◽

Oxygen Plasma ◽

Collagen Type ◽

Collagen Type I ◽

Oxygen Plasma Treatment ◽

Porous Scaffolds ◽

Type I ◽

Water Contact

3D poly(glycerol-sebacate)/poly(L-lactic-acid) (PGS/PLLA) scaffolds, produced by thermally induced phase separation (TIPS) method were treated with oxygen plasma in order to reduce the hydrophobicity of the PGS/PLLA membranes. After the oxygen plasma treatment, the pore size of scaffolds became uniform as well as an increasing in the roughness of the surface. No influence on chemical characteristics such as composition and bond types of PLLA was detected after the treatment. However, the change in the ratio of the scaffold elements before and after the oxygen plasma treatment was detected. Oxygen plasma treatment reduced the average of water contact angle of the TIPS film from 103.7± 10.1 to 64.7± 12.6 at the maximum exposure time (970 s) and power (100 W). The results showed that the goat temporomandibular joint (TMJ) cells attached well to the surface of the oxygen plasma modified scaffold. Furthermore, this modification significantly enhanced cell viability, increased cell proliferation and expression of related genes (Collagen type I mRNA and Collagen type II mRNA). The results demonstrated that it is a promising modification method to promote applications of PGS/PLLA based scaffolds to the regeneration of TMJ discs.

Download Full-text

Hydrophobic modification of bacterial cellulose using oxygen plasma treatment and chemical vapor deposition

Cellulose ◽

10.1007/s10570-020-03005-z ◽

2020 ◽

Vol 27 (18) ◽

pp. 10733-10746 ◽

Cited By ~ 2

Author(s):

Salomé Leal ◽

Cecília Cristelo ◽

Sara Silvestre ◽

Elvira Fortunato ◽

Aureliana Sousa ◽

...

Keyword(s):

Chemical Vapor Deposition ◽

Plasma Treatment ◽

Bacterial Cellulose ◽

Vapor Deposition ◽

Oxygen Plasma ◽

Chemical Vapor ◽

Oxygen Plasma Treatment ◽

Hydrophobic Modification

Download Full-text

Shear Bond Strength of Ceramic Veneers to Zirconia–Calcium Silicate Cores

Coatings ◽

10.3390/coatings11111326 ◽

2021 ◽

Vol 11 (11) ◽

pp. 1326

Author(s):

Ting-Yi Chiang ◽

Chun-Chuan Yang ◽

Yi-Hsuan Chen ◽

Min Yan ◽

Shinn-Jyh Ding

Keyword(s):

Contact Angle ◽

Phase Composition ◽

Surface Morphology ◽

Bond Strength ◽

Plasma Treatment ◽

Calcium Silicate ◽

Shear Bond Strength ◽

Oxygen Plasma ◽

Oxygen Plasma Treatment ◽

Water Contact

Improving the bond strength of veneering ceramics to ZrO2-based cores remains a challenge. The purpose of this study was to evaluate the shear bond strength of different ZrO2 cores containing calcium silicate (CaSi) to veneering ceramics. Five types of ZrO2-based cores (n = 230) were divided into two groups: with or without oxygen plasma treatment. These were bound to two veneering ceramics (IPS e.max Ceram or VITA VM9). Shear bond strength of veneering ceramics to various cores was measured (n = 10), in addition to phase composition, surface morphology and contact angle of the cores. The results indicated that the plasma treatment had a significant effect on the water contact angle of the ZrO2-based cores, but had little effect on the bond strength. Regardless of plasma treatment, the highest strength value was recorded in the ZrO2 core specimen containing 20 wt % CaSi, when all cores were adhered to VITA VM 9 veneer. When using IPS e.max Ceram veneer, the shear bond strength of the plasma-treated 20 wt % CaSi-containing ZrO2 core was 16.6 ± 0.9 MPa higher than that of VITA In-Ceram YZ core control (13.4 ± 1.0 MPa) (p < 0.05). We conclude that the presence of 20 wt % CaSi in ZrO2 can improve the shear bond strength of zirconia-based cores to veneering ceramic.

Download Full-text

Surface Modification of Chitosan Membranes by Oxygen Plasma Treatment

Materials Science Forum ◽

10.4028/www.scientific.net/msf.610-613.1259 ◽

2009 ◽

Vol 610-613 ◽

pp. 1259-1262 ◽

Cited By ~ 4

Author(s):

Na Ru Zhao ◽

Ying Jun Wang ◽

Li Ren ◽

Xiao Feng Chen

Keyword(s):

Contact Angle ◽

Plasma Treatment ◽

Water Contact Angle ◽

Photoelectron Spectroscopy ◽

Oxygen Plasma ◽

Chamber Pressure ◽

Oxygen Plasma Treatment ◽

Water Contact ◽

Plasma Irradiation ◽

Chitosan Membranes

Chitosan membranes were prepared by solvent cast method. In order to increase cell adhesion of the chitosan membranes, oxygen plasma treatment was applied to improve the hydrophilicity of the surface of chitosan membranes. The surface properties were characterized by scanning electron microscopy (SEM), contact angle analyzer, X-ray photoelectron spectroscopy (XPS). The effects of exposure time, plasma generating power, and chamber pressure on water contact angle of the chitosan membranes were investigated. The water contact angle of chitosan membranes decreased from 94.1° to 49.2° after plasma treatment. Which suggested the surfaces became more hydrophilic. XPS analysis showed that the oxygen content and the ratio of O/C increased markedly after oxygen plasma treatment. Furthermore, it was found that C-H bonds were broken with oxygen plasma treatment. C-OH group had been increased after plasma irradiation.

Download Full-text

Surface modification of bacterial cellulose membrane by oxygen plasma treatment

Surface and Coatings Technology ◽

10.1016/j.surfcoat.2016.06.035 ◽

2016 ◽

Vol 306 ◽

pp. 272-278 ◽

Cited By ~ 10

Author(s):

W. Bhanthumnavin ◽

P. Wanichapichart ◽

W. Taweepreeda ◽

S. Sirijarukula ◽

B. Paosawatyanyong

Keyword(s):

Surface Modification ◽

Plasma Treatment ◽

Bacterial Cellulose ◽

Oxygen Plasma ◽

Oxygen Plasma Treatment ◽

Cellulose Membrane ◽

Bacterial Cellulose Membrane

Download Full-text

High Breakdown Voltage GaN HEMT Device Fabricated on Self-Standing GaN Substrate

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.347-350.1535 ◽

2013 ◽

Vol 347-350 ◽

pp. 1535-1539

Author(s):

Jian Jun Zhou ◽

Liang Li ◽

Hai Yan Lu ◽

Ceng Kong ◽

Yue Chan Kong ◽

...

Keyword(s):

Plasma Treatment ◽

Breakdown Voltage ◽

Oxygen Plasma ◽

Cutoff Frequency ◽

Chemical Vapor ◽

Current Gain ◽

Organic Chemical ◽

Oxygen Plasma Treatment ◽

Gan Hemt ◽

High Breakdown Voltage

In this letter, a high breakdown voltage GaN HEMT device fabricated on semi-insulating self-standing GaN substrate is presented. High quality AlGaN/GaN epilayer was grown on self-standing GaN substrate by metal organic chemical vapor deposition. A 0.8μm gate length GaN HEMT device was fabricated with oxygen plasma treatment. By using oxygen plasma treatment, gate forward working voltage is increased, and a breakdown voltage of more than 170V is demonstrated. The measured maximum drain current of the device is larger than 700 mA/mm at 4V gate bias voltage. The maximum transconductance of the device is 162 mS/mm. In addition, high frequency performance of the GaN HEMT device is also obtained. The current gain cutoff frequency and power gain cutoff frequency are 19.7 GHz and 32.8 GHz, respectively. A high fT-LG product of 15.76 GHzμm indicating that homoepitaxy technology is helpful to improve the frequency performance of the device.

Download Full-text