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Journal articles on the topic 'Glass Nano-composites'

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Author: Grafiati
Published: 7 September 2023

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1

Odermatt, Reto, Matej Par, Dirk Mohn, Daniel B. Wiedemeier, Thomas Attin, and Tobias T. Tauböck. "Bioactivity and Physico-Chemical Properties of Dental Composites Functionalized with Nano- vs. Micro-Sized Bioactive Glass." Journal of Clinical Medicine 9, no. 3 (March 12, 2020): 772. http://dx.doi.org/10.3390/jcm9030772.

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Bioactive resin composites can contribute to the prevention of secondary caries, which is one of the main reasons for failure of contemporary dental restorations. This study investigated the effect of particle size of bioactive glass 45S5 on chemical and physical composite properties. Four experimental composites were prepared by admixing the following fillers into a commercial flowable composite: (1) 15 wt% of micro-sized bioactive glass, (2) 15 wt% of nano-sized bioactive glass, (3) a combination of micro- (7.5 wt%) and nano-sized (7.5 wt%) bioactive glass, and (4) 15 wt% of micro-sized inert barium glass. Hydroxyapatite precipitation and pH rise in phosphate-buffered saline were evaluated during 28 days. Degree of conversion and Knoop microhardness were measured 24 h after specimen preparation and after 28 days of phosphate-buffered saline immersion. Data were analyzed using non-parametric statistics (Kruskal–Wallis and Wilcoxon tests) at an overall level of significance of 5%. Downsizing the bioactive glass particles from micro- to nano-size considerably improved their capability to increase pH. The effect of nano-sized bioactive glass on degree of conversion and Knoop microhardness was similar to that of micro-sized bioactive glass. Composites containing nano-sized bioactive glass formed a more uniform hydroxyapatite layer after phosphate-buffered saline immersion than composites containing exclusively micro-sized particles. Partial replacement of nano- by micro-sized bioactive glass in the hybrid composite did not impair its reactivity, degree of conversion (p > 0.05), and Knoop microhardness (p > 0.05). It is concluded that downsizing bioactive glass particles to nano-size improves the alkalizing potential of experimental composites with no negative effects on their fundamental properties.
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2

Rudresh B M, Ravikumar B N, Madhu D, and Lingesh B V. "Synergistic Effect of Micro and Nano Fillers on Mechanical and Thermal Behavior of Glass-Basalt Hybrid Nano Composites." International Journal of Surface Engineering and Interdisciplinary Materials Science 7, no. 1 (January 2019): 20–36. http://dx.doi.org/10.4018/ijseims.2019010102.

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This article deals with the combined effect of micro and nano fillers on mechanical, thermal and morphological behavior of glass-basalt hybrid composites (GB). Three material systems were selected for the study: glass-basalt fiber reinforced 80 wt. % PA66 – 20 wt. % PTFE blend (GB), GB/Micro fillers (MoS2, SiC, Al2O3) (GBM) and GBM/nano fillers (TiO2) (GBN). It has been revealed from the experimentation that the effect of micro fillers deteriorated the mechanical behavior of micro composites (GBM). But the combined effect of micro and nano fillers slightly impaired the mechanical behavior of nano composites. The synergistic effect of micro and nano fillers constrained the loss of strength of nano composites. But the impact strength of nano composites has been improved due to hybrid fillers effect. The hybrid effect of fillers significantly improved the thermal stability of nano composites. Further, it is observed from the morphology that the fractured surfaces were characterized by fiber pull out and fiber overlapping, severe deformation and agglomeration of nano particles.
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3

Desai, Rahul K., Laxmi Tomar, and B. S. Chakrabarty. "Comparative Study of PAA/Alumina Composites with PAA/Alumina Nano Composites and Thermal Analysis of PAA/Alumina Nano Composites with Doping of Metals." Solid State Phenomena 209 (November 2013): 121–24. http://dx.doi.org/10.4028/www.scientific.net/ssp.209.121.

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The purpose of this work is to provide a comparative study of polyacrylic acid alumina (PAA/Al2O3) bulk composites with PAA/Al2O3 nano composites. This work also provides a study in the variation of glass transition temperature due to the doping of metal. Alumina nano particles were prepared using hydrothermal method. This sample was doped with Cu. Polyacrylic acid alumina nano composites were prepared using two different methods. The alumina samples were added to acrylic acid. In the first method the mixtures of acrylic acid and alumina samples were heated in oven. In the second method the same mixtures were irradiated with microwaves. The samples prepared were allowed to cool down and dried. Also the alumina bulk particles were also dispersed in acrylic acid and the similar procedure was carried out. The effect of preparation methods on the glass transition temperature of PAA/Al2O3 and PAA/Al2O3 nano composites have been studied. The glass transition temperatures Tg were determined using DSC analysis.
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4

D, Kumar, Kiran Shahapurkar, C. Venkatesh, Muruganandhan R, Vineet Tirth, Chandru Manivannan, Ibrahim M. Alarifi, Manzoore Elahi M. Soudagar, and Ahmed S. El-Shafay. "Influence of Graphene Nano Fillers and Carbon Nano Tubes on the Mechanical and Thermal Properties of Hollow Glass Microsphere Epoxy Composites." Processes 10, no. 1 (December 27, 2021): 40. http://dx.doi.org/10.3390/pr10010040.

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The present work aimed to analyze the roll of carbon nano tubes and graphene nano fillers on the mechanical and thermal characteristics of hollow glass microsphere reinforced epoxy composites. Composites with varying content of hollow glass microballoons (2, 4, 6, 8, and 10 wt %) reinforced in epoxy matrix were fabricated. Additionally, two more types of composites, one with graphene nano fillers and the other with carbon nano tube at a constant 0.5 wt %, were fabricated with varying weight percentages of hollow glass microballoons (2, 4, 6, 8, and 10%). The composites were fabricated using an open mold casting process. Composites were tested for thermal and mechanical properties. The tensile and flexural moduli were found to rise as the HGM concentration increased. Graphene-filled HGM/epoxy composites revealed the highest modulus compared with HGM/epoxy and HGM/CNT/epoxy composites. The impact strength of all composite types decreased as the HGM content increased. Neat epoxy specimens revealed low response as compared with all the composites tested. Further, the thermal conductivity of HGM/epoxy composites was lower as compared with other compositions and neat epoxy. Scanning electron microscopy was used to analyze the surface morphological behavior of the composites subjected to flexural test. It was found that HGM/G/E composites with 10% of HGM and 0.5% of graphene by weight in epoxy matrix were the optimum.
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5

Wang, Yong Kun, Li Chen, and Zhi Wei Xu. "Effect of Various Nanoparticles on Friction and Wear Properties of Glass Fiber Reinforced Epoxy Composites." Advanced Materials Research 150-151 (October 2010): 1106–9. http://dx.doi.org/10.4028/www.scientific.net/amr.150-151.1106.

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The glass fiber (GF) reinforced epoxy (EP) composites filled by nano-Al2O3, nano-TiO2, nano-SiO2 and multi-walled carbon nanotubes (MWCNTs) were prepared. The friction and wear behavior of composites under dry condition were evaluated with block-on-ring friction and wear tester. The morphologies of the worn surfaces of the composites were analyzed by scanning electric microscopy (SEM). The results show that 0.5 wt% MWCNTs and nano-TiO2 can significantly lower the friction coefficient and specific wear rate of composites, respectively, while 0.5 wt% nano-SiO2 and nano-Al2O3 can slightly lower the friction coefficient and specific wear rate of the composites.
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6

Calin, Mariana, Jürgen Eckert, and Ludwig Schultz. "High-strength Cu–Ti-rich bulk metallic glasses and nano-composites." International Journal of Materials Research 94, no. 5 (May 1, 2003): 615–20. http://dx.doi.org/10.1515/ijmr-2003-0107.

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Abstract Cu47Ti34Zr11Ni8, Cu47Ti33Zr11Ni8Fe1 and Cu47Ti33Zr11Ni8Si1 bulk glassy alloys were prepared by injection copper mold casting. Mechanical properties, glass-forming ability, thermal stability and microstructural characteristics of as-cast rods were investigated. Calorimetric studies indicate a beneficial role of small Si or Fe addition on the thermal stability of Cu–Ti – Zr –Ni bulk glassy alloys. Compression tests reveal fracture strengths of 2040 to 2190 MPa, Young’s moduli of 100 to 109 GPa and elastic strains up to 2.4 %. The Si-containing glassy alloy exhibits a plastic elongation of 2.2%. The significant increase in plasticity observed for the Si-containing alloy is due to a special bimodal composite structure consisting of nano-scaled Cu crystals homogeneously dispersed in the bulk metallic glass matrix. The increase of the global plasticity can be explained by the formation of multiple shear bands that make the glassy alloy resistant to crack propagation.
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7

YARLAGADDAA, Jyothhi, and Ramakrishna MALKAPURAM. "Influence of carbon nanotubes/ graphene nanoparticles on the mechanical and morphological properties of glass woven fabric epoxy composites." INCAS BULLETIN 12, no. 4 (December 4, 2020): 209–18. http://dx.doi.org/10.13111/2066-8201.2020.12.4.19.

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An epoxy matrix reinforced with multi-walled carbon nanotubes (MWCNTs) and graphene nano particles (GNPs) is used to fabricate woven glass fabric epoxy composites using Hand Layup and compression moulding technique. Three types of composites are fabricated using 7-mill plain weave glass fabric, +45o/-45o, 0o-90o multi axial glass woven fabrics as reinforcements and epoxy as matrix. Mechanical characterization is performed on the fabricated composites.0o-90o GWFE composites are fabricated with 0.5 wt%, 1.5 wt% MWCNTs, and 0.5 wt%, 1.5 wt% graphene nano particles (GNPs).The results from mechanical and morphological characterization revealed that specimens containing 0.5 wt%, 1.5 wt% MWCNTs, and 0.5wt %, 1.5 wt% graphene nanoparticles (GNPs) are altered when compared to the glass woven fabric epoxy composites without nanoparticles. Glass woven fabric epoxy (GWFE) composites with 1.5 wt% of MWCNT possess the highest hardness of 90.33 which is 6.27% greater when compared to other composites. The tensile strength of composite specimens containing 1.5 wt% graphene nanoparticles (GNPs) increased by 14.5% over glass woven fabric epoxy (GWFE) composites. The mode of fiber failure in tensile fractured surfaces of GWFE composites is apprised through SEM images.
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8

Korkmaz, Y., S. Gurgan, E. Firat, and D. Nathanson. "Shear Bond Strength of Three Different Nano-Restorative Materials to Dentin." Operative Dentistry 35, no. 1 (January 1, 2010): 50–57. http://dx.doi.org/10.2341/09-051-l.

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Clinical Relevance Nano glass ionomer exhibited significantly lower shear bond strength compared to nano-composites. The self-etch adhesive showed higher shear bond strength than etch&rinse adhesive for both nanofill and flowable nanofill composites.
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9

Yang, Jinshui, Chunqi Wang, Jingcheng Zeng, and Dazhi Jiang. "Effects of nano-SiO2 on mechanical and hygric behaviors of glass fiber reinforced epoxy composites." Science and Engineering of Composite Materials 25, no. 2 (March 28, 2018): 253–59. http://dx.doi.org/10.1515/secm-2014-0470.

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AbstractThe unmodified and nano-SiO2modified glass fiber reinforced polymer (GFRP) composites were prepared by the hot-compression molding process to investigate the effects of nano-SiO2on the mechanical and hygric properties of the GFRP composites. The results indicate that the nano-SiO2modification results in an increase of 9.7% and 7.9% in the tensile and flexural strength of the GFRP composites, and a decrease of 10.6% in the interlaminar shear strength (ILSS). The maximum swelling of the unmodified GFRP is 2.6 times as that of the nano-SiO2modified GFRP. The normalized-ILSS decrease of the nano-SiO2modified GFRP is only 12% after 138 days aging, while that of the GFRP reaches 31%. After 95-days hygric-aging, the decrease of the normalized flexural strength is 15.3% for the GFRP, while the normalized flexural strength of the nano-SiO2modified GFRP still maintains an increase of 5.0%. It is concluded that the nano-SiO2particle could improve the mechanical and hygric properties of the GFRP composites.
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10

Alavi, Fatemeh, and Ali Ashrafi. "Mechanical Properties of Glass–Fiber Polyester Reinforced Composites Filled with Nanometer Al2O3 Particles." Advanced Materials Research 586 (November 2012): 199–205. http://dx.doi.org/10.4028/www.scientific.net/amr.586.199.

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In this research the effects of the nano-particle additions and two different fabric architectures of knitted E-glass fibers on the mechanical properties of polyester fiberglass composites were investigated. The particles selected was 50 nanometer in size Al2O3 particles. E-glass fibers were knitted using two different molds by two different arrangements. Specimens were machined and mechanical tests were conducted as per the accepted test standard. Tension, impact and fracture properties were measured and their associated failure modes were compared with each other. Fracture behavior of specimens with and without nano-particle addition in unidirectional tensile test was studied using Scanning Electron Microscopy (SEM). Results obtained showed that tensile strength of the composite is significantly dependent on nano-particle addition and E-glass fiber architecture. Addition of 0.2 weight percent nano-particles enhances the tensile properties of polyester fiberglass composites. It was found that fracture behavior of composite depends strongly on nano-particle addition.
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11

Kakisawa, Hideki, Kazumi Minagawa, Susumu Takamori, and Yoshiaki Osawa. "Fabrication of Nano-Laminar Glass/Metal Composites by Sintering Glass Flakes." Materials Science Forum 539-543 (March 2007): 883–88. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.883.

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Fabrication of nano-laminar ceramic composite by a simple sintering technique was examined. Glass flakes with a thickness of 0.7μm coated with silver were used as model materials, and were consolidated by pulsed current sintering with a uniaxial press of 7.1MPa or 30MPa. By sintering the flakes at 943K, we obtained a fairly dense composite where the flakes were aligned by uniaxial press. The silver coating remained on the flakes through the sintering, and an interface layer between the flakes was formed. The sample’s indentation test demonstrated its high resistance to crack propagation through the transverse direction of the lamellar; this result was attributed to crack deflection at the interface and the accumulation of microfractures around the indentation mark.
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12

Abodunrin, O. W., and S. S. Oluyamo. "Structural Stability of Nano-Crystalline Aluminum-Glass Composites." IOSR Journal of Applied Physics 09, no. 01 (February 2017): 96–99. http://dx.doi.org/10.9790/4861-0901019699.

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13

Jang, Byung Koog, and Hideaki Matsubara. "Electrical Resistance Behavior during Tensile Loading of Al2 O3 Fiber-Nano RuO2-Glass Composites." Key Engineering Materials 317-318 (August 2006): 309–12. http://dx.doi.org/10.4028/www.scientific.net/kem.317-318.309.

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The conductive composites in which nano RuO2 particles are dispersed throughout a glass matrix have been successfully fabricated by sintering at 850°C. The sensing properties of conductive composites were investigated in real time during tensile testing by measuring the electrical resistance. It is shown that the excellent sensing ability based on electrical resistance changes in the low strain range was due to deformation of conduction paths between nano RuO2 particles by brittle fracture of the glass matrix. The change of electrical resistance depends strongly on the volume percent of Al2O3 fiber reinforcement.
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14

Fathy, A., A. Shaker, M. Abdel Hamid, and AA Megahed. "The effects of nano-silica/nano-alumina on fatigue behavior of glass fiber-reinforced epoxy composites." Journal of Composite Materials 51, no. 12 (July 28, 2016): 1667–79. http://dx.doi.org/10.1177/0021998316661870.

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This paper presents an experimental and statistical study of the fatigue behavior of unidirectional glass fiber-reinforced epoxy composite rods manufactured using pultrusion technique and modified with nanoparticles of alumina (Al2O3) and silica (SiO2) at four different weight fractions (0.5, 1.0, 2.0 and 3.0 wt.%). Tensile test was performed to investigate the influence of nanoparticles. Addition of alumina nanoparticles up to 3 wt.% increases the tensile strength by 54.76% over the pure glass fiber-reinforced epoxy specimen. For silica nanoparticles, there is an increase in the tensile strength of 31.29% for the content of 0.5 wt.% over the pure glass fiber-reinforced epoxy specimen. As the silica nanoparticles’ content increases over 0.5 wt.%, there is a decrease in the tensile strength. Rotating bending fatigue tests have been conducted at five different stress levels. Fatigue life of glass fiber-reinforced epoxy composite rods modified with alumina nanoparticles increases as the content of the nanoparticles increases. The effect of adding silica nanoparticles on the fatigue life of glass fiber-reinforced epoxy composite rods is relatively insignificant with a small improvement in the content of 0.5 wt.% silica above the pure glass fiber-reinforced epoxy specimens. Two-parameter Weibull distribution function was used to statistically analyze the fatigue life data.
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15

Shinoda, Yasuaki, Ichiro Shiota, Yuichi Ishida, Toshio Ogasawara, and Rikio Yokota. "Characterization of Fullerene / TriA-PI Composites." Advances in Science and Technology 51 (October 2006): 75–80. http://dx.doi.org/10.4028/www.scientific.net/ast.51.75.

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TriA-PI is a newly developed phenylethnyl terminated polyimide. It exhibits excellent mechanical properties and processability with high glass transition temperature (Tg>300°C). Nano-size particles of fullerene were dispersed throughout a thermosetting polyimide Triple API (TriA-PI) to elevate the glass transition temperature. The increase of the glass transition temperature of the composites with the fullerene was confirmed by dynamic mechanical analysis (DMA).
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16

Calin, M., J. Das, K. B. Kim, S. Pauly, N. Mattern, and Jürgen Eckert. "Enhanced Work Hardening of Cu-Based Bulk Metallic Glass Composites by In Situ Formed Nano-Scale Heterogeneities." Materials Science Forum 633-634 (November 2009): 665–73. http://dx.doi.org/10.4028/www.scientific.net/msf.633-634.665.

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The work hardening ability under room temperature compression of ductile Cu47.5Zr47.5Al5 and Cu47Ti33Zr11Ni8Si1 bulk metallic glass-forming alloys has been studied and compared. Both alloys exhibit high fracture strength, distinct work hardening and large plastic strain. Systematic investigations on the microstructural evolution reveal the occurrence of nano-scale heterogeneities, of both structural and chemical nature, which enables multiplication, branching, and restriction of the shear bands, thus controlling the plastic instability of metallic glasses. Phase separation in the liquid state leading to chemical inhomogeneities has been revealed for as-cast Cu47.5Zr47.5Al5 samples. In the case of Cu47Ti33Zr11Ni8Si1, a composite-type microstructure with in-situ formed nano-scale precipitates embedded in a glassy matrix is responsible for the distinct work hardening recorded on the stress-strain curves. The present results support the important role of nano-scale heterogeneities for promoting efficient work hardening in Cu-based metallic glass composites.
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17

Li, Qu, Heng Wu, Si Yuan Xie, Jiao Sun, Xing Hai Liu, and Hou Bin Li. "The Research of Poly Propylene Carbonate /Nano-SiO2 Composites." Advanced Materials Research 904 (March 2014): 74–77. http://dx.doi.org/10.4028/www.scientific.net/amr.904.74.

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Biodegradable poly (propylene carbonate) (PPC) composite with a slight improvement in the thermal stability and tensile strength was successfully prepared by incorporating a low content of nano-SiO2. Tensile tests demonstrate the better mechanical properties of the composites prepared in this study. The obtained composites increases sharply from 1.57Mpa to 12.04Mpa by incorporating 5wt% nano-SiO2. Furthermore, the composites show approximately 8°C higher glass transition temperature (Tg) than that of neat PPC.The Tdmax of composite with 5wt% of nano-SiO2 was about 40°C higher than that of neat PPC.
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18

Aydoğuş, Osman, and Mehmet Turan Demirci. "Nano-hybridization effects of nano-silica and nano-graphene platelet on mechanical properties of E-glass/epoxy nanocomposites." Journal of Composite Materials 56, no. 5 (January 3, 2022): 779–96. http://dx.doi.org/10.1177/00219983211065211.

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This study reveals the nano-hybridization effects of nano-graphene platelets (NGPs) and nano-silica (SiO2 nanoparticle), having different structural geometries on the mechanical properties, nano and micro-scale failure behaviors, and nanoscale fracture mechanisms of E-glass/epoxy composites. Tensile, three-point bending, and Charpy impact experiments were applied to determine the mechanical behaviors of 0.5 wt.% NGPs, 4 wt.% nano-silica and 0.5 wt.% NGPs + 4 wt.% nano-silica nanohybrid filled E-glass/epoxy and neat E-glass/epoxy composite samples. Failure of composite samples was examined by microscopy and SEM analysis. FTIR analyses were conducted to interpret the chemical and physical interactions between the nanoparticles and epoxy resin. Nano-hybridization exhibited the highest tensile strength and three-point flexural force for the composite samples. However, the NGPs filled nanocomposites also exhibited the best static tensile toughness and impact energy absorption. The experimental data showed that it was statistically significant as a result of the one-way ANOVA analysis. Remarkably, nano-hybridization of nano-silica and NGPs showed different fracture mechanisms at the nano and micro-scales.
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19

Mustapha, Rohani, Siti Noor Hidayah Mustapha, M. J. Suriani, C. M. Ruzaidi, and M. Awang. "Water Absorption Behaviour of Epoxy/Acrylated Epoxidized Palm Oil (AEPO) Reinforced Hybrid Kenaf/Glass Fiber Montmorillonite (HMT) Composites." Journal of Physics: Conference Series 2080, no. 1 (November 1, 2021): 012013. http://dx.doi.org/10.1088/1742-6596/2080/1/012013.

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Abstract The use of fiber-reinforced vegetable oil - polymer composites has increased in various technical fields. However, the long-term operating performance of these materials is still not well understood, limiting the development of these composites. In this study, the water absorption performance of hybrid composites, which consist of kenaf fiber and glass fiber as reinforcement, epoxy resin and acrylated epoxidized palm oil (AEPO) as a matrix, and montmorillonite (MMT) nano clays as a filler was evaluated with the function of different fibers layering order. The hand lay-up method is used to produce the composites with the variable number of kenaf fibers and glass fibers layer sequences. The water absorption kinetics of epoxy/AEPO reinforced hybrid kenaf/glass fiber-filled MMT composites are described in this paper. It has been observed that the water absorption rate of the composites depends on the fiber layering sequences. The alternative sequence of Glass-Kenaf-Kenaf-Glass and Kenaf-Glass-Kenaf-Glass composites layers exhibited the lowest moisture absorption rates of 7.61% and 7.63%, respectively.
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20

Rajhi, Ali A. "Mechanical Characterization of Hybrid Nano-Filled Glass/Epoxy Composites." Polymers 14, no. 22 (November 11, 2022): 4852. http://dx.doi.org/10.3390/polym14224852.

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Fiber-reinforced polymer (FRP) composite materials are very versatile in use because of their high specific stiffness and high specific strength characteristics. The main limitation of this material is its brittle nature (mainly due to the low stiffness and low fracture toughness of resin) that leads to reduced properties that are matrix dominated, including impact strength, compressive strength, in-plane shear, fracture toughness, and interlaminar strength. One method of overcoming these limitations is using nanoparticles as fillers in an FRP composite. Thereby, this present paper is focused on studying the effect of nanofillers added to glass/epoxy composite materials on mechanical behavior. Multiwall carbon nanotubes (MWCNTs), nano-silica (NS), and nano-iron oxide (NFe) are the nanofillers selected, as they can react with the resin system in the present-case epoxy to contribute a significant improvement to the polymer cross-linking web. Glass/epoxy composites are made with four layers of unidirectional E-glass fiber modified by nanoparticles with four different weight percentages (0.1%, 0.2%, 0.5%, and 1.0%). For reference, a sample without nanoparticles was made. The mechanical characterizations of these samples were completed under tensile, compressive, flexural, and impact loading. To understand the failure mechanism, an SEM analysis was also completed on the fractured surface.
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21

Deng, Shi Qiang, P. Rosso, Lin Ye, and Klaus Friedrich. "Interlaminar Fracture of CF/EP Composites Modified with Nano-Silica." Solid State Phenomena 121-123 (March 2007): 1403–6. http://dx.doi.org/10.4028/www.scientific.net/ssp.121-123.1403.

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Fracture toughness and other mechanical properties of epoxies modified with nano-slica particles were measured to elaborate effects of nano-additives on fracture behaviour of the modified epoxies. Interlaminar fracture behaviours of the nano-silica modified CF/EP composites were subsequently investigated by conducting Mode-I and Mode-II interlaminar fracture toughness tests as well as transverse tension tests. It was found that the fracture toughness of the nano-silica modified epoxies and the interlaminar fracture toughness of nano-silica modified CF/EP composites have been increased significantly (>50%), while the strength and modulus of the materials remain unchanged or slightly higher. In particular, the nano-silica modified epoxies showed only very little reduction in the glass transition temperature (Tg).
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22

Seethakaran, Pradeep Kumar, Gopalakrishnan Prabhakaran, and Paulraj Jawahar. "Mechanical and Tribological Behaviour of Hybrid Multi Fibre Reinforced Nylon 6-6 Nanocomposites." Materiale Plastice 58, no. 3 (October 5, 2021): 137–47. http://dx.doi.org/10.37358/mp.21.3.5512.

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The investigation on the effect of adding silane modified chopped E-glass fibre and Aluminium metal wire-mesh into nano silica toughened nylon 6-6 thermoplastic composites on mechanical, drop load impact, fatigue and tribological behaviour is studied in this paper. The primary aim of this research work is to develop a hybrid Nylon 6-6 nanocomposites having high stiffness, toughness and wear resistance. The chopped glass fibre and Al wire-mesh was surface treated with the help of 3-Aminopropyletrimethoxylane (silane) and acid etching. The tensile results revealed that additions of glass fibre and Al mesh into nano - silica toughened nylon 6-6 composite gives improved tensile and flexural strength. Similarly, the Izod impact strength of Al-mesh reinforced nano silica (1vol.%) toughened nylon 6-6 gives superior energy absorption up to 6 Joules/cm. The drop load impact penetration of composite N3 (59% - Nylon 66, 20% - E-glass fibre, 20% - Al wire mesh and 1 % - nano silica) shows very limited penetration than other composites. Highest fatigue life of 16391 cycles was observed for the composite designated N3, which contains 1 vol.% of nano silica, whereas the composite containing 2 vol.% of nano silica gives very lower specific wear rate and Co-efficient of friction. The developed composite which has better modulus, stiffness, wear resistance and fatigue life could be possibly used in automobile power transmission gears, domestic equipment and farm related machineries.
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23

Seethakaran, Pradeep Kumar, Gopalakrishnan Prabhakaran, and Paulraj Jawahar. "Mechanical and Tribological Behaviour of Hybrid Multi Fibre Reinforced Nylon 6-6 Nanocomposites." Materiale Plastice 58, no. 3 (October 5, 2021): 137–47. http://dx.doi.org/10.37358/mp.21.3.5512.

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The investigation on the effect of adding silane modified chopped E-glass fibre and Aluminium metal wire-mesh into nano silica toughened nylon 6-6 thermoplastic composites on mechanical, drop load impact, fatigue and tribological behaviour is studied in this paper. The primary aim of this research work is to develop a hybrid Nylon 6-6 nanocomposites having high stiffness, toughness and wear resistance. The chopped glass fibre and Al wire-mesh was surface treated with the help of 3-Aminopropyletrimethoxylane (silane) and acid etching. The tensile results revealed that additions of glass fibre and Al mesh into nano - silica toughened nylon 6-6 composite gives improved tensile and flexural strength. Similarly, the Izod impact strength of Al-mesh reinforced nano silica (1vol.%) toughened nylon 6-6 gives superior energy absorption up to 6 Joules/cm. The drop load impact penetration of composite N3 (59% - Nylon 66, 20% - E-glass fibre, 20% - Al wire mesh and 1 % - nano silica) shows very limited penetration than other composites. Highest fatigue life of 16391 cycles was observed for the composite designated N3, which contains 1 vol.% of nano silica, whereas the composite containing 2 vol.% of nano silica gives very lower specific wear rate and Co-efficient of friction. The developed composite which has better modulus, stiffness, wear resistance and fatigue life could be possibly used in automobile power transmission gears, domestic equipment and farm related machineries.
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24

Quadflieg, Till, Vijay K. Srivastava, Thomas Gries, and Shantanu Bhatt. "Mechanical Performance of Hybrid Graphene Nanoplates, Fly-Ash, Cement, Silica, and Sand Particles Filled Cross-Ply Carbon Fibre Woven Fabric Reinforced Epoxy Polymer Composites Beam and Column." Journal of Materials Science Research 12, no. 1 (April 10, 2023): 22. http://dx.doi.org/10.5539/jmsr.v12n1p22.

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The main goal of this study is to reduce the brittleness of a fibre-reinforced cement base structure when exposed to the effects of graphene nanoplates, fly ash, silica, sand, and cement fillers to better understand the effect of hybrid nano/micro particle fillers on the mechanical performance of cross-ply carbon fibre reinforced epoxy resin composites. A three-point bending test through the width was used to measure flexural strength. The impact tests Izod at low impact velocity and Charpy through the thickness were used to determine the dynamic fracture strengths of pre-cracked and non-cracked composite samples. Also, the compressive test method was used to measure the compressive strength of hybrid particles and short glass fibre-reinforced epoxy resin composite square and circular columns. The results show compressive strength and flexural strength. Izod impact energy, Charpy impact energy, and dynamic fracture toughness of hybrid nano/microparticle-filled fibre composites have higher values than virgin fibre composites due to the influence of graphene nanoparticles and perfect interface bonding between two dissimilar molecules of nano and microparticles, which improve the fracture toughness and absorb impact energy. Overall, the results indicate that molecules of nano/microparticle-filled carbon fibre and glass fibre-reinforced epoxy resin composites can be used in aggressive environments because of the improved mechanical properties in comparison to the virgin fibre composites. In addition, SEM micrographs clearly indicate that nano- and microparticles are resistant crack propagation and deboned of matrix fibres.
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Guo, Wei, Jiahao Yao, Eric A. Jägle, Pyuck-Pa Choi, Michael Herbig, Jochen M. Schneider, and Dierk Raabe. "Deformation induced alloying in crystalline – metallic glass nano-composites." Materials Science and Engineering: A 628 (March 2015): 269–80. http://dx.doi.org/10.1016/j.msea.2015.01.062.

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Peng, Guirong, Qingshan Li, Yanling Yang, and Haifeng Wang. "Degradation of nano ZnO-glass fiber-unsaturated polyester composites." Journal of Applied Polymer Science 114, no. 4 (November 15, 2009): 2128–33. http://dx.doi.org/10.1002/app.29988.

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Deng, Fei, Toshio Ogasawara, and Nobuo Takada. "Experimental Characterization of Poly (Ether Ether Ketone)/Multi-Wall Carbon Nanotube Composites." Key Engineering Materials 334-335 (March 2007): 721–24. http://dx.doi.org/10.4028/www.scientific.net/kem.334-335.721.

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In this study, poly (ether ether ketone) /carbon nanotubes (CNTs) nano composites were fabricated by using multi-walled carbon nanotubes (MWNTs) as the filler. Tensile properties of nano composites at before and after glass transmission temperature were studied. At room temperature, the addition of 15 wt% MWNTs increased the tensile modulus (0.10.3% strain) by 89% and the yield stress by 19%. At after glass transmission temperature (200) , they increased by 163% and 42%, respectively. The experimental results showed that the reinforcement of CNTs are more effective for high temperature than room temperature. DMA results showed an increase in storage modulus with increasing MWNTs loading fraction at both below and above the glass transition temperature Tg (around 145oC). Scanning electron microscope and transmission electron microscope images showed that the MWNTs were well dispersed in the matrix and orientated one direction.
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Prasad, M. M., N. Manikandan, and S. M. Sutharsan. "Investigation on mechanical properties of reinforced glass fibre/epoxy with hybrid nano composites." Digest Journal of Nanomaterials and Biostructures 16, no. 2 (2021): 455–69. http://dx.doi.org/10.15251/djnb.2021.162.455.

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In this study the experimental investigation of mechanical behaviour of Multi-Walled Carbon nanotubes (MWCNTs) and Aluminium Oxide (Al2O3) reinforced with EGlass/Epoxy nanocomposites at 0.5%, 1.5% and 2.0% of weight rated with 225 GSM, 300 GSM and 450 GSM glass fibres were studied. Test specimens were prepared at the standardof ASTM D638 for tensile specimen ASTM D256 for impact specimen. Testspecimens were prepared at the ratio of MWCNTs: Al2O3 is 1:4. 1.5 wt. % of MultiWalled CNTs filledE-Glass/Epoxy nanocomposites showed improved mechanical properties than glass fiber reinforced epoxy composites.450 GSM reinforced glass fiber epoxy composites containing 1.5wt. % of MWCNTs improved 36.27 % of higher tensile value and 28.57 % of impact value than the glass fibre reinforced epoxy composites. 225 and 300 GSM reinforced glass fibre epoxy composites with 1.5 wt. % of MWCNTs composites also has improved tensile and impact value than glass fibre reinforced epoxy composites. But, overall 450 GSM reinforced fibre nanocomposites showed enhanced mechanical properties than the other GSM reinforced nanocomposites. This proves MultiWalled Carbon Nanotubes is a successful reinforcement for E-Glass/Epoxy matrix and it improves its properties and performance.
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Liang, Sen, Xiao Zhang, Haibo Li, Min Luo, and Mangmang Gao. "Preparation of SiO2 nanocomposites with aligned distributing glass fibre using freeze-drying process." Processing and Application of Ceramics 11, no. 3 (2017): 201–5. http://dx.doi.org/10.2298/pac1703201l.

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The glass fibre reinforced nano-SiO2 composites (with up to 40 wt.% of glass fibres) as insulating materials were fabricated firstly by preparing aligned glass fibres under the ice formation followed by pressing and annealing. Scanning electron microscopy analyses confirmed the presence of parallel distribution of glass fibres in certain direction. The low-temperature nitrogen adsorption and mercury intrusion measurements showed that the composites have mesoporous structure with the mean pore size less than 20 nm. Further, it was found that the compressive strength and thermal conductivity of composite were 15.1MPa and 0.0585W/(m?K), respectively.
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Yang, Bing, Yu Fen Yang, and Guo Sheng Gai. "Preparation of SiO2/Cenoshpere Composites and Super-Hydrophobic Surface." Advanced Materials Research 826 (November 2013): 215–22. http://dx.doi.org/10.4028/www.scientific.net/amr.826.215.

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Nano SiO2/ cenoshpere composites were prepared to obtain the core-shell structure by chemical precipitation and heterogeneous nucleation. This kind of composites can be further used to fabricate super-hydrophobic surface. In this study, industrial fly ash cenoshpere and water glass solution were used as raw materials. The aim was to coat a layer of Nano SiO2 on the surface of cenosphere. By tests of SEM, XRD, FTIR, XPS, the mechanism of coating process was discussed. Treat the composites with KH-570, and then use this kind of particles to prepare super-hydrophobic surface.
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RAVICHANDRAN, SUBRAMANIAN, E. VENGATESAN, and A. RAMAKRISHNAN. "Stress - Strain Analysis and Deformation Behavior of Fiber Reinforced Styrene - Ethylene - Butylene - Styrene Polymer Hybrid Nano Composites." Material Science Research India 16, no. 1 (April 5, 2019): 62–69. http://dx.doi.org/10.13005/msri/160109.

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Composite materials are replacing traditional materials, because of their superior physical and mechanical properties. The main objective of the present work is to perform stress-strain analysis on Styrene-Ethylene-Butylene-Styrene (SEBS)-epoxy resin composites under reinforcement of fibres and dispersion of CuO, ZnO, MgO, SiO and TiO2nano metal oxides. Combination of glass fibre with particle reinforcement (GFRPs) applications has increased in recent days. In this study, glass fibre reinforced epoxy composites with different nano metal oxides are developed by compression moulding method and their mechanical properties such as breaking load, elastic limit, plastic range and fracture point are evaluated. The results indicate that the incorporation of nanophase material with glass fibre can improve the properties of composites.
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Karthick, L., R. Rathinam, Sd Abdul Kalam, Ganesh Babu Loganathan, R. S. Sabeenian, S. K. Joshi, L. Ramesh, H. Mohammed Ali, and Wubishet Degife Mammo. "Influence of Nano-/Microfiller Addition on Mechanical and Morphological Performance of Kenaf/Glass Fibre-Reinforced Hybrid Composites." Journal of Nanomaterials 2022 (September 5, 2022): 1–10. http://dx.doi.org/10.1155/2022/9778224.

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Natural-based composite’s progress as carriers has revealed many benefits in biomedicine, notably in the construction field, synthetic biology, and genetic engineering. Compared to analogous composites without nanoparticles, incorporating nanoparticles into polymeric materials improved architectural performance, physiological connections, and ecological features. The major goal of the current investigation is to determine the impact of nano-/micro-TiO2 on the mechanical characteristics of kenaf/glass/epoxy hybrids. The samples have been created using a hand layup method and a variety of filler loading and stacking sequences. The addition of nano-/microfiller significantly improved the mechanical performance of the epoxy/hybrid composite material. It was discovered that nanofiller-added composite materials fared better when composites were compared to and without microfilter-added composites. SEM was used to investigate the microstructure of the interfaces to ensure a good understanding of interfacial adherence between the reinforcement and their matrix. Compared to pure epoxy resin, the 15 wt% of microfiller additions of glass-kenaf-kenaf-glass type composites exhibit a 39.48% improvement in tensile and a 42.88% improvement in flexural. Similarly, 5 wt% nanofiller addition reveals a 44.214% improvement in tensile and a 50.50% improvement in flexural.
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Vance, Marc, Nathaniel C. Lawson, Manpreet Rupal, Preston Beck, and John O. Burgess. "Color and Gloss of Nano-Filled Resin-Modified Glass Ionomers and Resin Composites." Journal of Esthetic and Restorative Dentistry 27, no. 5 (December 1, 2014): 293–99. http://dx.doi.org/10.1111/jerd.12118.

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34

Anand, G., R. Dhinakaran, R. Elansezhian, and N. Alagumurthi. "Investigation on the Mechanical Properties of Newly Formulated Hybrid Polymer Composite." Applied Mechanics and Materials 852 (September 2016): 49–54. http://dx.doi.org/10.4028/www.scientific.net/amm.852.49.

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In this paper, synthesis characterization and testing of hybrid polymer composite reinforced with electroless coated glass fiber is reported. The poly vinyl ester based composite is prepared with Electroless nickel phosphorus (Ni-P) coated glass fiber as the reinforcement. The glass fiber is coated with Ni-P by electroless plating method. The electroless Ni-P coating increases coating uniformity which in turn significantly improves properties such as hardness, strength and wear resistance of the glass fiber. Nano additives (0.5 wt.%) such as iron oxide, titanium oxide, copper oxide, aluminum oxide and zinc oxide are added into the matrix as fillers. The influence of different Nano fillers and its effect on the mechanical properties are examined. The result showed that after adding different nano particles, TiO2 exhibited better properties when compared to composites with other nano additives. The experimental results showed that after Ni-P coating on the glass fiber, the ultimate tensile strength and compressive strength improved by 18% and 10% respectively and TiO2 added PMC with 63%, 25% and 5% respectively.
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UZAY, Çağrı, and Muhammed Safa KAMER. "Silan Kaplı SiO2 Nanopartiküllerin Cam FRP Kompozitlerin Sertlik Değerlerine Etkisi." Bitlis Eren Üniversitesi Fen Bilimleri Dergisi 11, no. 3 (September 30, 2022): 751–58. http://dx.doi.org/10.17798/bitlisfen.1076888.

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In this study, silane-coated SiO2 nanoparticles (as-received) were used as secondary reinforcement for glass fiber-reinforced polymer (FRP) composites, and the microhardness values of the developed composites were investigated. The nanoparticles were dispersed within the polymer epoxy at 1.5 wt.% and 3 wt.% ratios, respectively. Two different types of silane coating were used that were KH550 and KH570. The mixture of the epoxy resin and nanoparticles were subjected to ultrasonic homogenization to achieve a fine dispersibility of the SiO2 nanoparticles. Then the matrix was prepared with a suitable hardener at a weight ratio of 100:25. The strengthened polymer matrix was reinforced by woven glass fiber fabrics (primary reinforcing element). The vacuum bag method was applied to produce silane-coated nano SiO2 filled glass FRP composites. A digital microhardness testing device was used to determine the Vickers hardness values. While the pure glass/epoxy composite has resulted in a hardness of 20.69 HV, the maximum hardness value was recorded as 36.56 HV and it was obtained with 3 wt.% KH550-SiO2 filled glass/epoxy. The incorporation of silane-coated SiO2 nanoparticles has provided dramatic enhancements, approximately from 28% to 77%. The microscopic examination was also conducted via an optical microscope and the images were found helpful to explain the test results. Therefore, the findings of this study have shown that silane-coated nano SiO2 filler can be used as secondary reinforcement where high hardness and better wear resistance are desired for glass/epoxy composite applications.
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Mohan, K., and T. Rajmohan. "Mechanical behaviour of sisal – glass fiber reinforced hybrid Nano composites." IOP Conference Series: Materials Science and Engineering 390 (July 30, 2018): 012090. http://dx.doi.org/10.1088/1757-899x/390/1/012090.

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Duan, X. L., D. R. Yuan, F. P. Yu, and L. H. Wang. "Transparent cobalt doped MgO–Ga2O3–SiO2 nano-glass-ceramic composites." Applied Physics Letters 89, no. 18 (October 30, 2006): 183119. http://dx.doi.org/10.1063/1.2378401.

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38

Bafandeh, Mohammad Reza, Raziyeh Gharahkhani, and Mohammad Hossein Fathi. "Characterization of fabricated cobalt-based alloy/nano bioactive glass composites." Materials Science and Engineering: C 69 (December 2016): 692–99. http://dx.doi.org/10.1016/j.msec.2016.07.053.

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39

Garcia, Cristobal, Irina Trendafilova, Andrea Zucchelli, and Justin Contreras. "The effect of nylon nanofibers on the dynamic behaviour and the delamination resistance of GFRP composites." MATEC Web of Conferences 148 (2018): 14001. http://dx.doi.org/10.1051/matecconf/201814814001.

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Vibrations are responsible for a considerable number of accidents in aircrafts, bridges and other civil engineering structures. Therefore, there is a need to reduce the vibrations on structures made of composite materials. Delamination is a particularly dangerous failure mode for composite materials because delaminated composites can lose up to 60% of their strength and stiffness and still remain unchanged. One of the methods to suppress vibrations and preventing delamination is to incorporate nanofibers into the composite laminates. The aim of the present work is to investigate how nylon nanofibers affect the dynamic behaviour and delamination resistance of glass fibre reinforced polymer (GFRP) composites. Experiments and numerical simulations using finite element modelling (FEM) analysis are used to estimate the natural frequencies, the damping ratio and inter-laminar strength in GFRP composites with and without nylon nanofibers. It is found that the natural frequencies of the nylon nano-modified composites do not change significantly as compared to the traditional composites. However, nano-modified composites demonstrated a considerable increase in damping ratio and inter-laminar shear strength due to the incorporation of nylon nanofibers. This work contributes to the knowledge about the mechanical and dynamic properties of glass fibre reinforced polymer (GFRP) composites with nylon nanofibers.
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40

Srinivasan, V., R. Karthikeyan, N. Mohamad Raffi, and G. Ganesan. "Wear Characterisitcs of Nano-Particle Filled GFRP Composites." Advanced Composites Letters 19, no. 1 (January 2010): 096369351001900. http://dx.doi.org/10.1177/096369351001900101.

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In the recent years, the growth of glass fibre reinforced plastic (GFRP) is significantly higher than that of steel. In this study, the GFRP filled with 1 & 2% volume fraction of nano Alumina (Al2O3) particles were tested for their tribological behaviour. The wear maps were utilized to study the influence of control parameters like sliding velocity and normal force over the responses like coefficient of friction, contact temperature and wear rate. The micrographs of the worn out specimen showed the dominance of a particular wear mechanism in each sliding conditions.
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41

Seshanandan, G., D. Ravindran, and T. Sornakumar. "Effect of Nano Aluminum Oxide Fillers on the Properties of FRP Polymer Matrix Composites." Applied Mechanics and Materials 787 (August 2015): 612–16. http://dx.doi.org/10.4028/www.scientific.net/amm.787.612.

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Fiber reinforced plastics are composite materials made of polymer matrix reinforced with fibers. Fiber reinforced plastics find increased applications in automotive, marine, aerospace and construction industries. The objective of the present work is to study the effect of nano aluminum oxide fillers on the properties of glass fiber reinforced plastics. The glass fiber reinforced plastic specimens were manufactured with glass fiber chopped strand mat, polyester resin and nano aluminum oxide fillers by the hand layup technique. The nano aluminum oxide fillers are incorporated in different weight ratios in the fiber reinforced plastics and the mechanical properties were evaluated.
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42

Liu, Yuanjin, Lixiao Yao, Yue Bu, and Qing Sun. "Synergistical Performance Modification of Epoxy Resin by Nanofillers and Carboxyl-Terminated Liquid Nitrile–Butadiene Rubber." Materials 14, no. 16 (August 16, 2021): 4601. http://dx.doi.org/10.3390/ma14164601.

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Epoxy composite materials are widely used in power equipment. As the voltage level increases, the requirement of material properties, including electrical, thermal, and mechanical, has also increased. Introducing thermally conductive nanofiller to the epoxy/liquid rubber composites system is an effective approach to improve heat performance, but the effects of thermally conductive nanofillers on relaxation characteristics remain unclarified. In this paper, nano-alumina (nano-Al2O3) and nano-boron nitride (nano-BN) have been employed to modify the epoxy/carboxyl-terminated liquid nitrile–butadiene rubber (epoxy/CTBN) composites system. The thermal conductivity and glass transition temperature of different formula systems have been measured. The effect of the nanofillers on the relaxation behaviors of the resin matrix has been investigated. Results show that the different kinds of nanofillers will introduce different relaxation processes into the matrix and increase the conductivity at the same time. This study can provide a theoretical basis for the synergistic improvement of multiple properties of epoxy resin composites.
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43

Khanna, Sanjeev K., P. Ranganathan, S. B. Yedla, R. M. Winter, and K. Paruchuri. "Investigation of Nanomechanical Properties of the Interphase in a Glass Fiber Reinforced Polyester Composite Using Nanoindentation." Journal of Engineering Materials and Technology 125, no. 2 (April 1, 2003): 90–96. http://dx.doi.org/10.1115/1.1543966.

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Glass fiber reinforced polymer composites are widely used as structural materials. These two-component materials can be tailored to suit a large variety of applications. A better understanding of the properties of the fiber-matrix “interphase” can facilitate optimum design of the composite structure. The interphase is a microscopic region around the fiber and hence nano-scale investigation using nano-indentation techniques is appropriate to determine mechanical property variations within this region. In this study the atomic force microscope adapted with a commercial nanoindenter has been used to determine the variation of the elastic modulus across the interphase for different silane coated glass fiber reinforced polyester matrix composites. A comparative study of the elastic modulus variation in the various interphases is reported. The results are discussed in the light of the current limitations of the instrumentation and analysis.
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44

Frounchi, M., R. P. Burford, and R. P. Chaplin. "Silica nano-composites of Allyl Diglycol Carbonate Resin." Engineering Plastics 2, no. 2 (January 1994): 147823919400200. http://dx.doi.org/10.1177/147823919400200201.

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Composites of poly allyldiglycolcarbonate (ADC) and nano-sized silica particles were investigated in search of an alternative method to improve the fracture toughness of ADC resin. Transmission electron microscope studies revealed relatively uniform dispersion of silica particles in the resin. Dynamic mechanical analysis measurements indicated that an increase in the glass transition temperature of ADC resin was also accompanied by a higher flexure modulus. A small but significant increase in the fracture toughness of the composites was also observed. The fracture surfaces studied by scanning electron microscopy did not reveal silica particles even at very high magnification and appeared to be featureless smooth surfaces.
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45

Frounchi, M., R. P. Burford, and R. P. Chaplin. "Silica nano-composites of Allyl Diglycol Carbonate Resin." Polymers and Polymer Composites 2, no. 2 (February 1994): 77–82. http://dx.doi.org/10.1177/096739119400200201.

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Composites of poly allyldiglycolcarbonate (ADC) and nano-sized silica particles were investigated in search of an alternative method to improve the fracture toughness of ADC resin. Transmission electron microscope studies revealed relatively uniform dispersion of silica particles in the resin. Dynamic mechanical analysis measurements indicated that an increase in the glass transition temperature of ADC resin was also accompanied by a higher flexure modulus. A small but significant increase in the fracture toughness of the composites was also observed. The fracture surfaces studied by scanning electron microscopy did not reveal silica particles even at very high magnification and appeared to be featureless smooth surfaces.
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46

Sudha, L. K., Roy Sukumar, and K. Uma Rao. "Capacitance and Glass Transition Temperature of Nano Structured Alumina Polycarbonate Composites." Applied Mechanics and Materials 446-447 (November 2013): 73–78. http://dx.doi.org/10.4028/www.scientific.net/amm.446-447.73.

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This paper describes how glass transition temperature (Tg) and capacitance (Cp) of a nanomodified composite polymer changes as compared to that of its base polymer. Because of its versatile applications, polycarbonate materials (grade PC1100 and PC1220 respectively), which are commercially available, were chosen as the base polymer in this study and nanostructured alumina material was used as filler for fabricating the desired composites by varying the filler weight in the composite materials. The Tg of the composites has been evaluated by differential scanning calorimetry (DSC) technique and Cp of the composites are derived from AC conductivity measurements of the composites. Results show that the Tg decreases as a function of filler load in the composite material whereas capacitance of the composites increase with the filler load in the composites. A filler concentration equal to or greater than 5 wt% in the said composites, the Tg of the composites reduces upto 15°C, whereas Cp shoots up in the pico-farad range with the same level of filler load, as compare to base polymers.
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Gu, Ji You, Lan Zhang, and Xian Kai Jiang. "Influence of Acid-Treated Carbon Nano-Tubes on the Microstructure and Properties of Carbon Nano-Tubes Polyurethane Composites." Advanced Materials Research 146-147 (October 2010): 805–9. http://dx.doi.org/10.4028/www.scientific.net/amr.146-147.805.

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The investigations including the acid treatment to multi-walled carbon nano-tubes (MWNTs) and the synthesis of MWNTs/polyurethane composites via in situ polymerization were done. X-ray Photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and dynamic mechanical analysis (DMA) were utilized for evaluating the effects of acid-treated MWNTs on the properties and microstructure of the composites. The results indicated that carboxyl groups could be successfully introduced onto the surface of MWNTs by acid treatment. The dynamic storage modulus and glass transition temperature of composites increased with the existence of MWNTs. The improvement of polyurethane by acid-treated MWNTs performed better compared to raw MWNTs.
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48

Shiju, Jessy, Fakhreia Al-Sagheer, and Zahoor Ahmad. "Thermal Mechanical Properties of Graphene Nano-Composites with Kevlar-Nomex Copolymer: A Comparison of the Physical and Chemical Interactions." Polymers 12, no. 11 (November 19, 2020): 2740. http://dx.doi.org/10.3390/polym12112740.

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This paper reports the preparation of Kevlar-Nomex copolymer nano-composites with exfoliated pristine and functionalized graphene sheets (Grs). The graphene oxide (GrO) platelets were amidized by the reaction of amine-terminated aramid (Ar) with the functional groups present on the GrO surface to prepare the nano-composites films with different loadings of GrO. Chemical changes involved during the oxidation and subsequent amidation were monitored by Raman, FTIR and XP spectroscopic analyses. Morphology of the composite films was studied by atomic force and scanning electron microscopies. Viscoelastic properties of the hybrid films were studied for their glass transition temperature (Tg) and storage modulus by dynamical mechanical thermal analysis (DMTA). A higher shift in glass transition temperature was obtained by chemically binding the aramid copolymer chains on the functionalized Gr sheets. The increase in tensile strength and modulus at various loadings of GrO are compared with the composites using pristine Gr. The effect of interfacial interactions between the matrix chains and the reinforcement on the properties of these hybrids have been explained.
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Solairajan, A. Saravanapandi, S. Alexraj, P. Vijaya Rajan, and Godwin Jose. "Modelling and Analysis of Wear Prediction in Machining of Nano Based GFRP Composites Using RSM." International Journal of Engineering Research in Africa 20 (October 2015): 3–11. http://dx.doi.org/10.4028/www.scientific.net/jera.20.3.

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Glass fiber reinforced composite material was fabricated using E-glass fiber with unsaturated polyester resin. In Glass Fiber Reinforced Plastic (GFRP) composites, the matrix of polymer is reinforced with glass fibers. The surface quality and dimensional precision significantly affect the parts during their suitable life, particularly in cases where the components come in contact with other elements or materials. In the current study, GFRP is machined with two cases i.e. with and without Nano combinations in lathe. These machining studies were carried out on lathe using three different cutting tools: namely Carbide (K-20), Cubic Boron Nitrate (CBN) and Polycrystalline Diamond (PCD). The cutting parameters considered were cutting speed, feed, and depth of cut. Surface Finish is the most important parameter measured by main spindle and compares the value with another. A second order mathematical model in terms of cutting parameters was developed using RSM. The results specify the developed model is suitable for prediction of surface roughness in machining of GFRP composites.
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Bohinc, Klemen, Erna Tintor, Davor Kovačević, Rajko Vidrih, Anamarija Zore, Anže Abram, Željka Kojić, Marija Obradović, Valentina Veselinović, and Olivera Dolić. "Bacterial Adhesion on Glass–Ionomer Cements and Micro/Nano Hybrid Composite Dental Surfaces." Coatings 11, no. 2 (February 16, 2021): 235. http://dx.doi.org/10.3390/coatings11020235.

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Dental restorations need to reproduce the aspect of the natural teeth of the patient, and must be non-toxic, biocompatible, and have good mechanical properties so that they can last for longer. The aim of this study was to determine the extent of bacterial adhesion of Streptococcus mutans on four different dental material surfaces, i.e., two glass–ionomer cements (Fuji conventional and Fuji hybrid) and two ceramic composites (Micro hybrid composite and Nano hybrid composite). To understand the bacterial adhesion on these four different dental materials, various surface properties were measured: roughness, contact angle, CIE color parameters and zeta potential. We found that the greatest adhesion extent was obtained for the Nano hybrid composite surface. The pronounced adhesion is the interplay between the relatively high roughness and hydrophilicity of the Nano hybrid composite surface. Color changes upon immersing ceramic composites in red wine and black tea proved that both beverages adhered to them. Black tea adhered more intensively than wine, and showed a higher inhibitory effect on the growth of Streptococcus mutans and Staphylococcus aureus.
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