Infrared Spectroscopy - Materials Science, Engineering and Technology

doi:10.5772/2055

Cited by 97 publications

(14 citation statements)

References 49 publications

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“…This allowed for quantitative analysis of the unreacted components left within the matrix system after curing. An excess of unreacted epoxy groups is shown by the downward peak at 4530 cm -1 [34] in Figure 12 for samples where R < 1.0 .…”

Section: Effect Of Amine:epoxy Ratio On Ifssmentioning

confidence: 99%

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The influence of hardener-to-epoxy ratio on the interfacial strength in glass fibre reinforced epoxy composites

Minty

Yang

Thomason

2018

Composites Part A: Applied Science and Manufacturing

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This work seeks to develop a better understanding of the influence that the chemistry of an epoxy thermoset system has on the stress-transfer capability of the fibre-matrix interface. We discuss the correlation between the interfacial shear strength (IFSS) and the properties of the matrix such as glass transition temperature (T g), storage modulus and linear coefficient of thermal expansion (LCTE). The results indicate that each is strongly dependent on the hardener-to-epoxy ratio and it was found that changes in IFSS can be related to changes in the thermomechanical properties of the matrix. From the results presented it is hypothesized that residual radial compressive stresses at the interface are influenced by the chemistry of the matrix system due to the changes in the properties of the matrix. The combination of these residual stresses with static friction may lead to a potential variation of the interfacial stresstransfer capability in glass-fibre reinforced epoxy composites.

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Section: Effect Of Amine:epoxy Ratio On Ifssmentioning

confidence: 99%

“…Fourier transform infrared spectroscopy (FT-IR) is a widely recognized technique used to obtain the infrared spectrum of emission or absorption of a material [32][33][34][35][36]. These spectra allow for the molecular structure of the material to be studied.…”

Section: Fourier Transform Infrared Spectroscopymentioning

confidence: 99%

The influence of hardener-to-epoxy ratio on the interfacial strength in glass fibre reinforced epoxy composites

Minty

Yang

Thomason

2018

Composites Part A: Applied Science and Manufacturing

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“…Certainly, the band at 1198 cm -1 , assigned to the stretching vibration of Si-O-Et bond of GPTMS, is still present after the grafting process. Likewise, bands at 4527 and 906 cm -1 , attributed to epoxy ring, are observed in grafted clay [36,37]. Considering that the epoxy groups should not undergo modification during the grafting process, its band, at 906 cm -1 , can be used as a reference to estimate the condensation degree of GPTMS during the process using the following equation:…”

Section: Grafting Of Clay Nanoparticlesmentioning

confidence: 99%

Epoxy-silica/clay nanocomposite for silver-based antibacterial thin coatings: Synthesis and structural characterization

Mejía

Yohai

Pedetta

et al. 2017

Journal of Colloid and Interface Science

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Development of new functional coatings in the field of health care, as antibacterial applications, deals with a straight control of the diffusive properties that rules the releasing of the active component. In this work, the development of a silver-rich nanocomposite thin coating, loaded with organically modified clay nanoparticles, is presented. The synthesis process included an environment-friendly silanization process of clay nanoparticles (Laponite® S482) with (3-glycidoxypropyl)trimethoxysilane (GPTMS) and the further hydrolytic condensation with tetraethoxysilane (TEOS). Silanization process and the obtained coatings were analysed by Fourier transformed infrared spectroscopy, UV-visible spectroscopy, X-ray diffraction, thermogravimetric curves and scanning electron microscopy. The silanization process of clay nanoparticles with the organically reactive alkyl alkoxysilane, allowed to stabilize and exfoliate the clay nanosheets within a hybrid organic-inorganic sol-gel material. Ring opening of grafted epoxy groups carried to an increasing of the basal spacing, of intercalated clay nanosheets, from 1.3 to 1.8nm. Moreover, incorporation of organically modified clay nanosheets introduced a significant stabilization on the development of silver nanoparticles inside the structure of the nanocomposite coating, retaining the silver inside the coating material and restricting the growing of silver nanoparticles on the surface of the coating. Antibacterial behaviour, against E. coli cultures, performed through agar diffusion tests, provided promising results that allow assuming that the studied nanocomposite coating serves as a reservoir of ionic silver, permitting the antibacterial effect.

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“…The Lambert-Beer law has enabled determination of the relative mass fraction in the centrifuged solution in relation to the noncentrifuged solution with the known nanotube mass. For optimal sonication and centrifugation times, the Lambert-Beer absorbance ratio [19,20] equalled 0.7 irrespective of the type of carbon forms (FC) and the 0.1 % -30 % range of the analyzed FC concentration. For instance, this means that for instance for each initial weight unit of nanotubes (MWNTs) seven parts remained in the solution, whereas three parts were deposited on the sidewalls of the container used to perform centrifugation.…”

Section: Methodsmentioning

confidence: 99%

Effect of Carbon Forms on Properties of Ag-C Composites Contact Materials

Pietrzak

Frydman

Wójcik-Grzybek

et al. 2018

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This paper presents the manufacturing method of silver based composite materials containing 3 % vol. carbon forms (nanotubes and graphene). The most significant challenge was to obtain good dispersion of carbon in the metallic matrix. The applying of suitable dispersants allows to get uniform distribution of carbon reinforcement. Triton X-100 and ultrasonic support were used in the powder mixing process. Ag-nanotubes and Ag-graphene contact tips were made using Spark Plasma Sintering process (SPS). The results of research into both physical and electrical properties of these composites are presented. It has been demonstrated that the form of introduced carbon exerts influence on the electrical characteristics of contacts, and particularly on arc erosion. Performed electrical test indicated that Ag-nanotubes contacts showed higher resistance to arc erosion than Ag-graphene contacts. It can be explained by the better dispersion to individual carbon nanotubes their lower than for graphene edge defects density and due to this higher thermal and electrical conductivity.

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Infrared Spectroscopy - Materials Science, Engineering and Technology

Cited by 97 publications

References 49 publications

The influence of hardener-to-epoxy ratio on the interfacial strength in glass fibre reinforced epoxy composites

The influence of hardener-to-epoxy ratio on the interfacial strength in glass fibre reinforced epoxy composites

Epoxy-silica/clay nanocomposite for silver-based antibacterial thin coatings: Synthesis and structural characterization

Effect of Carbon Forms on Properties of Ag-C Composites Contact Materials

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