Study of Surface Characteristics of T700 Carbon Fibers and Interfacial Properties of their Reinforced Epoxy Composites

2013 ◽  
Vol 364 ◽  
pp. 706-710
Author(s):  
Ling Cong Li ◽  
Li Li Wang ◽  
Hua Hao ◽  
Hui Ling ◽  
Hong Jie Sun ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Surface Energy ◽  
Carbon Fibers ◽  
Photoelectron Spectroscopy ◽  
Interfacial Adhesion ◽  
Dynamic Contact Angle ◽  
Surface Characteristics ◽  
Interfacial Properties ◽  
Epoxy Composites ◽  
Sem Images

The purpose of this paper is to comparatively study the surface characteristics of domestic and Toray T700 carbon fibers (T700-CFs) and the interfacial properties of their reinforced epoxy composites. The surface roughness and surface energy of the fibers were characterized by scanning electron microscope (SEM) and dynamic contact angle analysis (DCAA). The surface chemistry analysis of the fibers was carried out by using X-ray photoelectron spectroscopy (XPS). The interfacial properties of the T700-CF/epoxy composites were studied by testing the interlaminar shear strength (ILSS), observing SEM images of composites profiles and calculating the interfacial adhesion factors from dynamic mechanical thermal analysis (DMTA) data. The results show that domestic T700-CFs have a better interfacial adhesion to epoxy matrix due to its higher surface roughness, chemical activity and surface energy than Toray T700-CFs.

Improving Interfacial Adhesion of Sub-Micro PA6 Composites with De-Sized Carbon Fiber

2017 ◽  
Vol 890 ◽  
pp. 44-49
Author(s):  
Mohamed H. Gabr ◽  
Kiyoshi Uzawa
Keyword(s):  
Carbon Fiber ◽  
Carbon Fibers ◽  
Photoelectron Spectroscopy ◽  
Interfacial Adhesion ◽  
Fiber Composites ◽  
Interfacial Shear ◽  
Conventional Heating ◽  
Carbon Fiber Composites ◽  
Sem Images ◽  
Acetone Treatment

In our previous study we showed the the potential of using of sub-micro Alumina/Titanium (ALTi) particles as a multifunctional reinforcement which can produce multifunctional polymer composites. This paper aims to investigate the interfacial shear properties for different contents of ALTi particles incorporated into PA6 with de-sized carbon fiber. By means of X-ray photoelectron spectroscopy (XPS), activated carbon atoms can be detected, which are defined as the carbon atoms conjunction with oxygen and nitrogen. Sizing removal can reduce the acid parameter of carbon fibers surface promoting bonding strength at the fiber/matrix interface which is a desirable property for the carbon fiber composites. XPS also, showed that epoxide group still appeared with using acetone treatment while disappeared with conventional heating at the oven for 25min ate 450oC. SEM images did not show any damage for the carbon fiber after heat treatment. Interfacial shear strength (IFSS) showed an improvement in interfacial adhesion with de-sizing carbon fiber than neat PA6.

Enhanced interfacial property of carbon fiber reinforced epoxy composite based on carbon fiber treated by supercritical water/nitrate system

2021 ◽  
pp. 002199832110154
Author(s):  
Xiaojian Cao ◽  
Jialiang Li
Keyword(s):  
Surface Roughness ◽  
Carbon Fiber ◽  
Surface Energy ◽  
Carbon Fibers ◽  
Supercritical Water ◽  
Interfacial Adhesion ◽  
Epoxy Composite ◽  
Treated Carbon ◽  
Carbon Fiber Epoxy ◽  
Nitrate System

Carbon fibers were surface treated with supercritical water/nitrate system to improve the interfacial adhesion of the carbon fiber/epoxy composite. The surface chemistry analysis showed that oxygen functional groups on the surface of the carbon fibers increased after treatment, which were mainly carbonyl and carboxyl groups. The surface microstructure observation indicated that the treatment obviously increased the surface roughness of the carbon fibers. Surface energy of the treated carbon fibers also increased. The increased functional groups, surface roughness and surface energy were beneficial to enhance the interfacial adhesion of the carbon fiber/epoxy composite. Compared with the untreated carbon fibers, the strength loss of the treated carbon fibers was less than 3% and the other mechanical properties were almost unchanged. The caclulated interfacial fracture energy and the interfacial shear strength of the treated carbon fiber/epoxy composite were enhanced by 19% and 29%, respectively, compared with the untreated carbon fiber/epoxy composite. In summary, supercritical water/nitrate treatment is a potential method for changing the inert surface of carbon fibers to improve the interfacial adhesion between carbon fibers and matrix.

Surface modification of polyimide fibers by oxygen plasma treatment and interfacial adhesion behavior of a polyimide fiber/epoxy composite

2017 ◽  
Vol 24 (4) ◽  
pp. 477-484 ◽  
Author(s):  
Xuyang Sun ◽  
Junfeng Bu ◽  
Weiwei Liu ◽  
Hongqing Niu ◽  
Shengli Qi ◽  
...  
Keyword(s):  
Free Energy ◽  
Plasma Treatment ◽  
Surface Free Energy ◽  
Photoelectron Spectroscopy ◽  
Interfacial Adhesion ◽  
Oxygen Plasma ◽  
Dynamic Contact Angle ◽  
Epoxy Composites ◽  
Oxygen Plasma Treatment ◽  
Adhesion Properties

AbstractOxygen plasma was used to enhance the surface behavior of polyimide (PI) fibers and PI fiber-reinforced epoxy composites were prepared in our present work. The effects of plasma treating times on the surface properties of PI fiber and the interfacial adhesion of PI fiber/epoxy composites were investigated. Surface chemical composition, surface morphologies and surface free energy of the fibers were characterized by X-ray photoelectron spectroscopy, scanning electron microscopy and dynamic contact angle analysis, respectively. The results suggest that some oxygen functional groups were introduced onto PI fiber surfaces, and the surface roughness of fibers was enhanced. Resultantly, the surface free energy of fibers and the interfacial adhesion of composites were improved by the oxygen plasma treatment. The interlaminar shear strength of the composites increased to 70 MPa when the fibers were treated for 10 min, which proved good interfacial adhesion properties.

A look into the interaction of metal oxide thin films with biological media: Albumin and Fibrinogen adsorption

2012 ◽  
Vol 1376 ◽  
Author(s):  
P. Silva-Bermudez ◽  
S. Muhl ◽  
M. Rivera ◽  
S. E. Rodil
Keyword(s):  
Surface Roughness ◽  
Surface Energy ◽  
Protein Adsorption ◽  
Photoelectron Spectroscopy ◽  
Ex Situ ◽  
Polar Component ◽  
Metal Oxide Thin Films ◽  
Adsorbed Protein ◽  
Major Chemical ◽  
Fibrinogen Adsorption

ABSTRACTIn the present work, the adsorption of albumin and fibrinogen on Ta, Nb, Ti and Zr oxidesthin films deposited on Si (100) wafers by magnetron sputtering was studied in order to get a better understanding of the correlation among the surface properties of these oxides and the protein adsorption phenomena on their surfaces. The surface energy, hydrophobicity, chemical composition, roughness and atomic order of the films were characterized. The films were immersedfor 45 minutes in single protein solutions; either albumin or fibrinogenand the adsorbed protein layer on the films was studied ex-situ in a dry ambient using bothX-ray photoelectron spectroscopy and atomic force microscopy.The adsorption of albumin and fibrinogen on the films modified the surface morphology and decreased the surface roughness for all the four different metal oxides. The XPS results confirmed the presence of the protein on the surface of the films and showed that the two proteins studied were adsorbed without undergoing a major chemical decomposition. A correlation between the surface roughness,the polar component of the surface energy of the films and the atomic percentage of nitrogen on the films after protein adsorption, an indirect signal of the amount of protein adsorbed, was found for albumin and fibrinogen adsorption on Ta, Nb and Ti oxides; the largest the roughness or the polar component the largest amount of adsorbed protein.

Preparation of Hydrophobic Nylon Fabric

2016 ◽  
Vol 11 (1) ◽  
pp. 155892501601100
Author(s):  
Jinmei Du ◽  
Lulu Zhang ◽  
Jing Dong ◽  
Ying Li ◽  
Changhai Xu ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Contact Angle ◽  
Surface Energy ◽  
Water Contact Angle ◽  
Sem Images ◽  
Water Contact ◽  
Carboxyl Content ◽  
Factors Affecting ◽  
Nylon Fabric ◽  
Butanetetracarboxylic Acid

Surface roughness and surface energy are two important factors affecting the hydrophobicity of nylon fabric. In this study, nylon fabric was treated for hydrophobicity with tetrabutyltitanate (TBT) and octadecylamine (OA) which were respectively responsible for increasing surface roughness and reducing surface energy. In order to enhance the hydrophobicity, In order to further enhance hydrophobicity by increasing available reactive sites, 1,2,3,4–butanetetracarboxylic acid (BTCA) was applied as a pretreatment to the nylon fabric It was found that the carboxyl content of nylon was increased by the BTCA pretreatment. SEM images showed that the TBT treatment produced small particles on nylon fabric which made surface rough. The water contact angle of nylon fabric treated with BTCA, TBT and OA was measured to be 134°, which was much greater than the water contact angle of nylon fabric treated only with OA. This indicated that the surface roughness resulting from the TBT treatment played an important role in improving hydrophobicity of the treated nylon fabric. The resistance to water penetration and the repellency of water spray of nylon fabric treated with BTCA, TBT and OA were respectively measured to be 27.64 mbar and 85 out of 100.

scholarly journals Femtosecond Laser Fabrication of Engineered Functional Surfaces based on Biodegradable Polymer and Biopolymer/Ceramic Composite Thin Films

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 378 ◽  
Author(s):  
Albena Daskalova ◽  
Irina Bliznakova ◽  
Liliya Angelova ◽  
Anton Trifonov ◽  
Heidi Declercq ◽  
...  
Keyword(s):  
Thin Films ◽  
Surface Roughness ◽  
Femtosecond Laser ◽  
Surface Functionalization ◽  
Biodegradable Polymer ◽  
Photoelectron Spectroscopy ◽  
Laser Energy ◽  
Surface Characteristics ◽  
Laser Pulses ◽  
Xrd Analysis

Surface functionalization introduced by precisely-defined surface structures depended on the surface texture and quality. Laser treatment is an advanced, non-contact technique for improving the biomaterials surface characteristics. In this study, femtosecond laser modification was applied to fabricate diverse structures on biodegradable polymer thin films and their ceramic blends. The influences of key laser processing parameters like laser energy and a number of applied laser pulses (N) over laser-treated surfaces were investigated. The modification of surface roughness was determined by atomic force microscopy (AFM). The surface roughness (Rrms) increased from approximately 0.5 to nearly 3 µm. The roughness changed with increasing laser energy and a number of applied laser pulses (N). The induced morphologies with different laser parameters were compared via Scanning electron microscopy (SEM) and confocal microscopy analysis. The chemical composition of exposed surfaces was examined by FTIR, X-ray photoelectron spectroscopy (XPS), and XRD analysis. This work illustrates the capacity of the laser microstructuring method for surface functionalization with possible applications in improvement of cellular attachment and orientation. Cells exhibited an extended shape along laser-modified surface zones compared to non-structured areas and demonstrated parallel alignment to the created structures. We examined laser-material interaction, microstructural outgrowth, and surface-treatment effect. By comparing the experimental results, it can be summarized that considerable processing quality can be obtained with femtosecond laser structuring.

Improving the interfacial properties of carbon fibers/vinyl ester composites by vinyl functionalization on the carbon fiber surface

RSC Advances ◽  
2016 ◽  
Vol 6 (35) ◽  
pp. 29428-29436 ◽  
Author(s):  
Xiuping Zhang ◽  
Liu Liu ◽  
Ming Li ◽  
Yanjie Chang ◽  
Lei Shang ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Carbon Fibers ◽  
Vinyl Ester ◽  
Interfacial Adhesion ◽  
Fiber Surface ◽  
Interfacial Properties ◽  
Resin Composites ◽  
Vinyl Ester Resin ◽  
Adhesion Properties ◽  
Carbon Fiber Surface

APMA functionalized CFs can significantly improve the interfacial adhesion properties of the carbon fiber reinforced vinyl ester resin composites.

Stepwise growth of melamine-based dendrimers onto carbon fibers and the effects on interfacial properties of epoxy composites

2017 ◽  
Vol 138 ◽  
pp. 144-150 ◽  
Author(s):  
Min Zhao ◽  
Linghui Meng ◽  
Lichun Ma ◽  
Guangshun Wu ◽  
Fei Xie ◽  
...  
Keyword(s):  
Carbon Fibers ◽  
Interfacial Properties ◽  
Epoxy Composites

scholarly journals Effect of Surface Characteristics of Different Implant Abutment Materials on the Microbial Adhesion- An Invitro Study

2021 ◽  
Author(s):  
Vimal Munot ◽  
Ramesh P Nayakar ◽  
Raghunath Patil
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Surface Energy ◽  
Test Group ◽  
Surface Characteristics ◽  
Microbial Adhesion ◽  
Implant Abutment ◽  
Group B ◽  
Pair Wise Comparison ◽  
Effect Of Surface

Introduction: In two-stage implants, micro-gap between the fixture and the abutment and the superstructure are the potential areas to cause peri-implantitis. The surface roughness and surface energy of the implant abutment materials play an important role in the microbial colonisation on their surface and can help the clinician to choose a better implant abutment material in terms of microbial affinity. Aim: To evaluate the effect of surface characteristics of different implant abutment materials on microbial adhesion. Materials and Methods: The comprehensive analytical experimental study was conducted at KAHER KLE VK Institute of Dental Sciences, Belagavi between Jan 2017- Dec 2017. Forty-five (n=45) identical disc shaped specimens were fabricated using; Zirconia (Group A), Titanium alloy (Group B) and Surgical Grade Stainless Steel (Group C). The surface roughness was assessed for all test groups by Profilometer and Scanning Electron Microscope (SEM). The Surface energy was evaluated for all the test group specimens using Goniometer. Microbial adhesion and assessment were performed using sonicating and vortexing method for all the three groups using three different bacterial strains. The Colony Forming Units for all the specimens were tabulated and subjected to statistical analysis to draw the conclusions from the resultant data.The resultant data was analysed using SPSS software (Version 20). In order to collectively compare the means of the study groups pair-wise comparison of the test group was done using paired t-test with (p<0.05), and correlation between the surface parameters and CFU counts was done using Karl Pearson’s correlation coefficient. Results: On pair-wise comparison of three Groups (A, B, and C) with respect to surface roughness, there were statistically significant differences in surface roughness Ra values between all the groups p<0.001. On pair-wise comparison of all the three Groups with respect to surface energy, there were statistically significant differences in Wetting Angle (WA) values between all the groups (p<0.001**) except between group B and A (p=0.15). Zirconia showed the least CFU counts for Pi and Aa though the differences were not statistically significant. Karl Pearson’s correlation coefficient between surface roughness and surface energy with CFU counts showed a strongly positive correlation for all microbial species and were statistically significant p<0.001**. Conclusion: There was a strongly positive correlation of surface roughness and surface energy to CFU counts. Zirconia showed a low colonisation potential against P.intermedia and A.actinomycetemcomitans than titanium alloy and surgical grade stainless steel.

Sign in / Sign up

Export Citation Format

Share Document