Journal articles on the topic 'Nano modified composite'
To see the other types of publications on this topic, follow the link: Nano modified composite.
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 journal articles for your research on the topic 'Nano modified composite.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.
1
Li, Zhenxia, Tengteng Guo, Yukun Chen, Qi Liu, and Yuanzhao Chen. "The properties of nano-CaCO3/nano-ZnO/SBR composite-modified asphalt." Nanotechnology Reviews 10, no. 1 (January 1, 2021): 1253–65. http://dx.doi.org/10.1515/ntrev-2021-0082.
Full textAbstract:
Abstract To solve the problem of the pavement being aged due to the influence of temperature, light and other environmental factors are brought in service. Nano-CaCO3 surface was activated by 6% KH-550, and nano-ZnO surface was activated by 6% aluminate. Nano-CaCO3/nano-ZnO/SBR composite-modified asphalt was prepared. The optimum proportion of composite-modified asphalt was determined by orthogonal test. The influence of modifiers on asphalt pavement performance was comprehensively studied. The microstructure of composite-modified asphalt was characterized by scanning electron microscopy and infrared spectroscopy. The mechanism of composite-modified asphalt was analyzed. The results show that the optimum combination of composite-modified asphalt is 4% nano-CaCO3 + 5% nano-ZnO + 4% SBR, the aging performance of the composite-modified asphalt is reduced by 6.9%, and the viscosity is increased by 14.6–23.1%. The complex shear modulus is increased by 24.1% at 82°C, the stiffness modulus is decreased, on average, by 21.1%. and the creep curve slope is increased by 9% on average. In the meantime, during the preparation process of composite-modified asphalt, it mainly occurred due to chemical reaction with surface-modified nanomaterials and physical change with SBR polymer materials.
2
Zheng, Li Yun, Zhi Min Liu, and Ya Jun Zhao. "Preparation and Properties of Nano-Hydroxyapatite Modified Nylon Composites." Advanced Materials Research 87-88 (December 2009): 228–32. http://dx.doi.org/10.4028/www.scientific.net/amr.87-88.228.
Full textAbstract:
To enhance the mechanical property and the bioactivity of composites, nano-hydroxyapatite (n-HA) modified monomer casting nylon-6 (n-HA/N) composites were prepared by in situ polymerization. During the synthesis of n-HA/N composite, the n-HA and caprolactam were mixed, melt and placed in the field of ultrasonic radiation. The differences between composite with ultrasonic and without ultrasonic were investigated. The tensile strength and the viscosity average molecular weight of the nylon matrix were measured. The results show that the molecular weight of the nylon matrix decreased firstly and it had the lowest value when the content of nano-hydroxyapatite was 1.6 wt.%. After that the molecular weight increased and then it began to decrease when it reached the highest value. But the tensile strength of the n-HA/N composite were improved. The ultrasonic dispersion made the n-HA more evenly dispersed in the nylon and increased the mechanical properties of the n-HA/N composites significantly. The bioactivity and moisture absorption of n-HA/N composites in simulated body fluid (SBF) were examined and compared to pure nylon. What's more, Fourier transform infrared spectrometer was used to characterize the structure of the materials formed on the surface of the composite. The results showed that moisture absorption of the n-HA/N composites was lower than that of the pure nylon. After composites impregnated 16 days in SBF, a layer of carbon hydroxyapatite (CHA) with weak crystalline was formed on the surface of sample. This phenomenon showed that the n-HA/N composites have good bioactivity.
3
Nie, Hua Wei, Yuan Kang Zhou, Yang Cao, and Guo Qing Li. "Research of Nanometer TiO2/PF Composites and the Properties of Semi-Metallic Friction Material." Advanced Materials Research 631-632 (January 2013): 239–45. http://dx.doi.org/10.4028/www.scientific.net/amr.631-632.239.
Full textAbstract:
A type of phenolic resin (PF) was prepared by using TiO2 nanoparticles modified with KH-550 as composite filler and modifier, and then the composite modified PF were used as adhesive to prepare semi-metallic friction materials samples. TG analysis of the prepared nano-TiO2 /PF composites was conducted on SETARAM-TG2DSC92216 thermal analyzer that was made in France, and the friction and wear property comparison tests of the samples were carried out on XD-MSM fixed speed friction-wear machine. The results show that the heat resistance of phenolic resin after being compositely modified by TiO2 nanoparticles can be improved, carbon residue rate increases10% at 600°C；the friction coefficient of the corresponding sample slightly increases；the wear rate clearly decreases at high temperature, and wear rate decreases 10% at 350°C.
4
Tao, He, Hongming Liu, Xiangbing Xie, Tao Sun, Ruipeng Dong, and Xiaolu Lu. "Preparation and Properties of Nano-ZnO Combined with Biomass Heavy Oil Composite-Modified Asphalt." Advances in Materials Science and Engineering 2022 (December 23, 2022): 1–9. http://dx.doi.org/10.1155/2022/5179787.
Full textAbstract:
Biomass heavy oil is employed to partially substitute the petroleum-based asphalt due to its renewability, environmentally friendly, and cost-effective advantages. However, its usage weakens the high-temperature performance of petroleum asphalt. Therefore, nano-ZnO was employed as a modifier to make composite-modified asphalt to improve the high-temperature performance in this paper. It was prepared in two steps: first, bio-asphalt was prepared by adding biomass heavy oil based on a certain content of matrix asphalt and then adding nano-ZnO with the particle size of 20 nm. The modification methods of bio-asphalt and composite-modified asphalt were analyzed by Fourier infrared (FTIR) and X-ray diffraction (XRD) experiments. Three major indexes test, dynamic shear rheological test, Brookfield rotational viscosity test (RV), and thermogravimetric analysis (TG-DSC) are used to analyze the high-temperature performance of bio-asphalt and composite-modified asphalt. The results show that biomass heavy oil and nano-ZnO are used to physically and chemically modify asphalt and the modification effect of bio-asphalt is the best when the biomass heavy oil content is about 9%. The high-temperature performance of composite heavy oil-modified asphalt is improved significantly. The performance indexes of Bio-6% and 1% nano-ZnO composite-modified asphalt are better than bio-asphalt. However, the high-temperature performance of Bio-12% and 3% nano-ZnO composite-modified asphalt is the best.
5
Wu, Chao, Yanfeng Gao, Xidong Liang, Stanislaw M. Gubanski, Qian Wang, Weining Bao, and Shaohua Li. "Manifestation of Interactions of Nano-Silica in Silicone Rubber Investigated by Low-Frequency Dielectric Spectroscopy and Mechanical Tests." Polymers 11, no. 4 (April 19, 2019): 717. http://dx.doi.org/10.3390/polym11040717.
Full textAbstract:
Silicone rubber composites filled with nano-silica are currently widely used as high voltage insulating materials in power transmission and substation systems. We present a systematic study on the dielectric and mechanical performance of silicone rubber filled with surface modified and unmodified fumed nano-silica. The results indicate that the different interfaces between the silicone rubber and the two types of nano-silica introduce changes in their dielectric response when electrically stressed by a sinusoidal excitation in the frequency range of 10−4–1 Hz. The responses of pure silicone rubber and the composite filled with modified silica can be characterized by a paralleled combination of Maxwell-Wagner-Sillars interface polarization and DC conduction. In contrast, the silicone rubber composite with the unmodified nano-silica exhibits a quasi-DC (Q-DC) transport process. The mechanical properties of the composites (represented by their stress-strain characteristics) reveal an improvement in the mechanical strength with increasing filler content. Moreover, the strain level of the composite with a modified filler is improved.
6
Cheng, Zhi Qiang, Gui Hua Pang, Hong Yan Wang, Jun Feng Li, and Xue Zhong Zhao. "Fabrication and Characterization of Poly L-Lactic Acid/Modified Nano-Hydroxyapatite Composite Fibrous Scaffold." Advanced Materials Research 535-537 (June 2012): 1095–99. http://dx.doi.org/10.4028/www.scientific.net/amr.535-537.1095.
Full textAbstract:
Nano-hydroxyapatite were modified with biocompatible polyethylene glycol (PEG) by surface coating, so modified nano-hydroxyapatite particles (modified nano-HA) were prepared. A homogeneous solution was obtained by dispersing the modified nano-HA into poly l-lactic acid (PLLA) solution. Composite fibrous scaffold was fabricated via electrostatic spinning method with the homogeneous solution. The composite fibrous scaffold was characterized by SEM, TEM and XRD techniques. The characterization results showed that the surface morphology of the composite fibrous scaffold was smooth, modified nano-HA was dispersed in PLLA homogeneously, the hydrophilicity of composite fibrous scaffold were increased obviously. Adipose-derived stem cells (ADSCs) proliferating in the fibrous scaffold were investigated by using laser scanning confocal microscope observation.
7
Mahendrarajah, Ghowsalya, Everson Kandare, and Akbar A. Khatibi. "Enhancing the Fracture Toughness Properties by Introducing Anchored Nano-Architectures at the Metal–FRP Composite Interface." Journal of Composites Science 3, no. 1 (February 13, 2019): 17. http://dx.doi.org/10.3390/jcs3010017.
Full textAbstract:
This paper presents a novel technique for improving aluminium–glass/epoxy composite interfacial bonding through the generation of metallic nano-architectures on the metal surface. Silver nanowires (AgNWs) deposited via solution casting at varying concentrations and annealed at different temperatures in an air atmosphere improved the aluminium-glass/epoxy composite fracture toughness as measured via mode I experiments. For AgNW concentrations of 1 and 3 g/m2 deposited via a single-stage process and annealed at 375 °C, the initiation fracture toughness of the aluminium-glass/epoxy composite improved by 86% and 157%, respectively, relative to the baseline composite without AgNWs. The corresponding steady-state fracture toughness of these nano-modified fibre metal laminates (FMLs) were at least seven times greater than the baseline composite. The FML variant in which AgNWs were deposited at a concentration of 3 g/m2 through a two-stage process followed by annealing at 375 °C and 300 °C, respectively after each deposition, achieved the highest steady-state fracture toughness of all nano-modified composites—a fracture toughness value that was 13 times greater than the baseline composite. Intrinsic and extrinsic toughening mechanisms dictated by the morphology of the silver nano-architectures were found to be responsible for the improved initiation and steady-state fracture toughness in nano-modified FMLs.
8
Rong, Zhidan, Mingyu Zhao, and Yali Wang. "Effects of Modified Nano-SiO2 Particles on Properties of High-Performance Cement-Based Composites." Materials 13, no. 3 (February 1, 2020): 646. http://dx.doi.org/10.3390/ma13030646.
Full textAbstract:
In this research, silane coupling agent was used to modify the surface of nano-SiO2, particles and the effects of modified nano-SiO2 particles on the mechanical properties of high-performance cement-based composites and its mechanism were systematically studied. The results indicated that the optimum modification parameters were a coupling agent content of 10%, reaction temperature of 65 °C, and reaction time of 8 h. Compared with the unmodified nano-SiO2, the modified nano-SiO2 promoted and accelerated the hydration process of cement. The pozzolanic effect, filling effect, and nucleation effect of modified nano-SiO2 made the microstructure of the composite more compact, and thus improved static mechanical properties of cement-based composites.
9
Jabbar, Fayq Hsan, and Wisam A. Latif. "A Comparative Analysis of Various Types of Modified Bentonite Clays Added to Poly Methyl Butadiene for Nanocomposite Preparation." NeuroQuantology 19, no. 1 (February 18, 2021): 67–71. http://dx.doi.org/10.14704/nq.2021.19.1.nq21010.
Full textAbstract:
New Nano-composite of biopolymers was prepared for this analysis. The natural bentonite clay group forms Na- Bentonite (Na- BTT), K- Bentonite (K- BTt), and Ca- Bentonite (Ca-Btt) has been modified by the addition of synthesized fatty amide (FACO), namely Corn oil (CO). To achieve the modification the clay particles was mixed thoroughly in an aqueous (FACO) solution which increases the separation of the clay layer from 1.25 to 2.75 nm of BTT, 1.17 to 1.34 nm of BTt and 1.14 to 1.31nm of Btt due to the action exchange capacity of Na- BTT which is much greater than the low cation exchange capacity of K- BTt and Ca-Btt, respectively. The improved Na- BTT was then used in the preparation of poly methyl butadiene (PMB) Nano-composite. The modifiers interaction in the clay layer is described by X-ray diffraction (XRD). A conventional approach was used to synthesize the Nano-composite, in which the modified clay (FACO- BTT) was melt mixed with PMB. To classify the Nano-composite XRD, Transmission Electron Microscopy (TEM) and Thermogravimetric have been used. The results of XRD and TEM confirmed Nano-composite growth. In contrast to pure PMB, PMB modified BTT Nano-composite showed higher thermal stability. The use of FACO as a vegetable oil derivative to modify clay would minimize reliance on petroleum based surfactants. Moreover, such Nano-composites are considered environmentally friendly in addition to being renewable resources.
10
Tang, Xin De, Xiang Li Kong, Fang Huang, and Jun Li. "Performance Evaluation of Nano-Montmorillonite/SBS Modified Asphalt Paving Mixtures." Materials Science Forum 688 (June 2011): 191–94. http://dx.doi.org/10.4028/www.scientific.net/msf.688.191.
Full textAbstract:
To provide the valuable references for pavement materials applied in various climatic zones, a series of asphalts paving mixtures including common asphalt mixture, SBS modified asphalt mixture and nano-montmorillonite (NMMT)/SBS composite modified asphalt mixture were designed. Marshall tests were carried out to evaluate the effect of different modifiers on the property of these asphalt paving mixtures. Compared with the other two mixtures, NMMT/SBS composite modified asphalt shows fine mechanical performance and moisture susceptibility. These results indicate that NMMT/SBS as a composite modifier can result in excellent properties for asphalt paving mixture.
11
Tang, Xin De, Xiang Li Kong, Zhong Guo He, and Jun Li. "Nano-Montmorillonite/SBS Composite Modified Asphalt: Preparation and Aging Property." Materials Science Forum 688 (June 2011): 175–79. http://dx.doi.org/10.4028/www.scientific.net/msf.688.175.
Full textAbstract:
Nano-montmorillonite (Nano-MMT)/SBS composite modified asphalts were prepared by melt blending, the aging property of which was detected by rolling thin film oven test (RTFOT) method. The microstructure of Nano-MMT/SBS modified asphalts was characterized by X-ray diffraction (XRD). The results demonstrated that nano-composite structures formed by the intercalation effect of SBS and asphalt into the MMT lamellae, which led to improvement in terms of toughness, strength, and thermal stability. In comparison with SBS modified asphalt, Nano-MMT impact on the properties of the modified asphalt appeared as a decreasing penetration, an increasing softening point, and a decreasing ductility. The anti-deformation ability under high temperature of Nano-MMT/SBS modified asphalt improved significantly. The softening point of the Nano-MMT/SBS modified asphalt decreased after aging, in contrast with that of the base asphalt, which could be attributed to the different rheological properties between the Nano-MMT/SBS modified asphalt and the base asphalt. Compared with that of SBS modified asphalt, the anti-aging property of Nano-MMT/SBS modified asphalt improved dramatically. This indicated that the lamellar structure of montomorillonite in modified asphalt could prevent oxygen from diffusing and permeating in matrix and the thermo-oxidative aging of base asphalt and SBS weakens.
12
Li, Gui Juan, Hai Xi Luo, Wei Xia, Xue Feng Xu, and Yu Zhang. "Preparation and Properties of Nano Coir Cellulose Whiskers Enhanced CS/PVA Composite Film." Materials Science Forum 999 (June 2020): 145–54. http://dx.doi.org/10.4028/www.scientific.net/msf.999.145.
Full textAbstract:
Nano coir cellulose whiskersare materials abstracted from mesocarp of coconut shell which was modified by using KH570 as a coupling agent and modified nano coir cellulose whiskers need to be dispersed in chitosan/polyvinyl alcohol (CS/PVA) mixture solution. Because of regular structure and high crystallinity, nano coir cellulose whiskers could be applied in medical materials.In this paper, the results obtained with solution casting method by characterizing and analyzing structure, thermal properties, crystallization behavior and morphology of nano coir cellulose whiskers enhanced CS/PVA composite filmby FTIR, DSC, TG, XRD and SEM test. Different content of modified nano coir whiskers and CS/PVA composite film were preparedand themechanical properties of the composite film were also conducted. The results show that the tensile strength and Young's modulus of the CS/PVA composite film with modified nano coir whiskers are significantly improved, and Elongation break increases at first and then decreases, which indicates nano coir cellulose whiskers are good materials for medical purpose.
13
Wang, Wentao, Lisheng Zhou, Yang Li, Peng Li, Guohui Chen, and Shishan Yang. "Study on the Ablation Properties of Nano-graphite Modified EPDM Insulators." Journal of Physics: Conference Series 2133, no. 1 (November 1, 2021): 012019. http://dx.doi.org/10.1088/1742-6596/2133/1/012019.
Full textAbstract:
Abstract To improve the anti-ablative property of EPDM-based composites, nano-graphite powder as anti-ablation filler was introduced to optimize the EPDM insulation material formulas. Characterization of anti-ablation performance showed that the composite at the nano-graphite content of 10phr exhibited the best anti-ablation and mechanical performances, such as: a linear ablation rate of 0.062 mm/s, a mass ablation rate of 0.048 g/s, tensile strength of 5.69 MPa and Elongation at break of 391.2%. The nano-graphite was proven to be an effective material which is beneficial to improve the anti-ablation of the EPDM composites.
14
Ahmaruzzaman, M., and D. K. Sharma. "Nano Composite from Coal Modified Novolac Resin." Polymer-Plastics Technology and Engineering 46, no. 8 (August 6, 2007): 811–14. http://dx.doi.org/10.1080/03602550701277956.
Full text
15
Liu, Hechen, Yu Sun, Yunfei Yu, Mingjia Zhang, Le Li, and Long Ma. "Effect of Nano-SiO2 Modification on Mechanical and Insulation Properties of Basalt Fiber Reinforced Composites." Polymers 14, no. 16 (August 17, 2022): 3353. http://dx.doi.org/10.3390/polym14163353.
Full textAbstract:
Basalt fiber (BF) has high mechanical strength, good insulation performance and low cost. It is suitable to be used as reinforcement material in the manufacture of electrical equipment. However, the large surface inertia of basalt fiber makes it difficult to combine with the matrix material, which seriously limits its service life and application scenarios. In addition, the serious vacancy in the research of insulation properties also limits its production and application in the electrical field. Therefore, in order to solve the problem of difficult bonding between basalt fiber and resin matrix and make up for the research blank of basalt fiber composites in insulation performance, this paper provides a basalt fiber modification method—SiO2 coating, and tests the insulation and mechanical properties of the modified composite. We used nano-SiO2 coating solution to modify basalt fiber, and manufactured BF/resin composite (BFRP) by hand lay-up and hot-pressing technology, and experimentally analyzed the influence of nano-SiO2 content on the mechanical and insulation properties of the modified composite. Fourier transform infrared spectrum and scanning electron microscope analysis showed that nano-SiO2 was successfully coated on basalt fibers. Through the microdroplet debonding test, it was found that the IFSS of fiber/resin was improved by 35.15%, 72.97 and 18.9%, respectively, after the modification of the coating solution with SiO2 concentration of 0.5%, 1% and 1.5%, showing better interface properties; the single fiber tensile test found that the tensile strength of the modified fiber increased slightly. Among all composites, 1 wt% SiO2 coating modified composites showed the best comprehensive properties. The surface flashover voltage and breakdown field strength reached 13.12 kV and 33 kV/mm, respectively, which were 34.6% and 83% higher than unmodified composite. The dielectric loss is reduced to 1.43%, which is 33.8% lower than the dielectric loss (2.16%) of the untreated composite, showing better insulation ability; the tensile strength, bending strength and interlaminar shear strength were increased to 618.22 MPa, 834.74 MPa and 16.29 MPa, respectively, which were increased by 53%, 42.4% and 59.7%, compared with untreated composites. DMA and glass transition temperature showed that the modified composite had better heat resistance. TGA experiments showed that the resin content of the modified composite increased, and the internal structure of the composite became denser.
16
Xie, Xiangbing, Tao Hui, Yaofei Luo, Han Li, Guanghui Li, and Zhenyu Wang. "Research on the Properties of Low Temperature and Anti-UV of Asphalt with Nano-ZnO/Nano-TiO2/Copolymer SBS Composite Modified in High-Altitude Areas." Advances in Materials Science and Engineering 2020 (April 30, 2020): 1–15. http://dx.doi.org/10.1155/2020/9078731.
Full textAbstract:
Strong ultraviolet light and low-temperature are the typical environmental characteristics in high-altitude areas. The performance of SBS-modified asphalt in the above environmental characteristics needs further study. To improve the resistance ultraviolet (UV) ageing and low-temperature performance of copolymer- (SBS-) modified asphalt, an SBS-modified asphalt containing nano-ZnO and nano-TiO2 is proposed. In this paper, nano-ZnO, nano-TiO2, and SBS were used as modifiers with the silane coupling agent (KH-560) as the nanomaterial surface modification. The orthogonal test table was used to analyse the effects of the three modifiers on the physical properties of modified asphalt at different dosages. On this basis, the physical properties, low-temperature properties, and ageing indices (carbonyl index and sulfoxide index) were studied for base asphalt, SBS-modified asphalt, nano-ZnO/SBS-modified asphalt, and nano-ZnO/nano-TiO2/SBS composite-modified asphalt before and after photoaging. The content changes of characteristic elements (Zn and Ti) in the nano-ZnO/nano-TiO2/SBS composite-modified asphalt before and after ageing were studied by scanning electron microscopy with energy dispersive spectroscopy (SEM/EDS), and the UV ageing mechanism was revealed. The results indicate that two nanoparticles show the best compatibility with asphalt after surface modification and can improve the binding ability between SBS and base asphalt. The orthogonal test analysis shows that nano-ZnO has a highly significant effect on the low- and high-temperature performance of the nano-ZnO/nano-TiO2/SBS composite-modified asphalt, and nano-TiO2 has a significant effect on the high-temperature performance. Three optimal composite-modified systems for base asphalt including 4% nano-ZnO/1.5% nano-TiO2/3.2% SBS were proposed and had the best antiaging ability. Compared with the sulfoxide index, the carbonyl index changed most obviously before and after ageing. Additionally, the results reveal that nano-TiO2 has a good absorption effect at a wavelength of 365 nm (ultraviolet light), while nano-ZnO is liable to photolysis, and its activity decreases at this wavelength.
17
Chen, Hao, Lin Li, Wei Zhao, Xiao-Rui Zhang, and Ling Weng. "Corona Resistance Mechanism of Nano-Modified Polyimide." Polymers 14, no. 24 (December 14, 2022): 5469. http://dx.doi.org/10.3390/polym14245469.
Full textAbstract:
In this paper, the effect of field strength on the corona-resistant lifespan of a composite film and the effect of doping on the dielectric properties of the composite film were studied. The method for predicting corona-resistant lifespan under working electric field strength is discussed. Scanning electron microscopy (SEM) was used to characterize the morphology and the structure of the composite film near the breakdown point after corona formation. Fourier transform infrared spectroscopy (FT-IR) was used to characterize the imidiated film, and a conductivity current test was used to calculate the electrical aging threshold of the film. The results showed that the introduction of nano-SiO2 particles could greatly improve the corona-resistant lifespan of the material. At 155 °C, when the applied external electric field strength was extrapolated to 20 kV/mm, the corona-resistant lifespan of the PI/nano-SiO2 three-layer composite film with 10 wt% nano-particle doping was 7472.61 h.
18
Li, Shuai, Wenyuan Xu, Fengfa Zhang, He Wu, and Qixin Ge. "Effect of Graphene Oxide on Aging Properties of Polyurethane-SBS Modified Asphalt and Asphalt Mixture." Polymers 14, no. 17 (August 26, 2022): 3496. http://dx.doi.org/10.3390/polym14173496.
Full textAbstract:
In order to clarify the effect of the new nano-material graphene oxide on the performance of Polyurethane-SBS modified asphalt and asphalt mixture under the effect of thermal aging, the cracking process of semicircular bending test (SCB) specimens was monitored in situ based on computer vision image processing technology (OpenCV), and the modified asphalt and the cracking characteristics of the modified asphalt and mixture were further analyzed by the tests of semicircular three-point bending and aggregate contact angle measurement. The test results showed that the thermal aging effect severely damaged the composite structure formed by the cross-linking effect of Polyurethane and SBS modifier in asphalt, which intensified the degradation of Polyurethane and SBS modifier and led to great changes in the rheological properties of asphalt after aging. However, the incorporation of the new nanomaterial Graphene oxide can slow down the degradation of Polyurethane and SBS modifiers and the change of asphalt cross-linked composite structure, making the anti-cracking and anti-aging properties of Graphene oxide-Polyurethane-SBS modified asphalt mixes better than those of Polyurethane-SBS modified asphalt mixes. Therefore, the new nano-material graphene oxide added to Polyurethane-SBS modified asphalt is meaningful and feasible. Graphene oxide-polyurethane-sbs composite modified asphalt, as a new nano-material modified asphalt, is stronger against the ultraviolet and light asphalt that is prone to aging. With regards to improving the application of road projects, the results are very promising.
19
Rudresh, M., B. H. Maruthi, H. P. Nagaswarupa, and B. S. Surendra. "Mechanical Assisted Modification of Halloysite Nano Clay: Characterization and Its Effect on Mechanical Properties of Halloysite-Epoxy Nano Composites." Asian Journal of Engineering and Applied Technology 8, no. 1 (February 5, 2019): 32–37. http://dx.doi.org/10.51983/ajeat-2019.8.1.1063.
Full textAbstract:
Modificationof Halloysite nano clay has been done using 3-aminopropyltriethoxysilane in the presence of distilled water as solvent media. Untreated and modified nano clay was characterized by Powder X-ray diffractometer (PXRD), Scanning Electron Microscope (SEM), Fourier Transform Infrared Spectroscopy (FT-IR). Functionalization of Halloysite nano clay is also strongly affected the morphological parameters and enabling the application in epoxy nano composite. However, the influence of modified clay concentration on the mechanical properties of epoxy/nanoclay composites, with different concentrations (2%, 3%, 4% and 5%) of nano clay in the epoxy resin was investigated. Experimental results showed that the mechanical properties of epoxy were improved upto 4 wt% of HNP’s, evidently because of the loading of modified clay. The tensile strength, tensile Modulus, flexural strength, flexural modulusand fracture toughness of the nanocomposites increased by 13%, 17%, 9%, 14%and 27% respectivelythis demonstrated that the composites were strengthened.
20
Yamamoto, Tetsuya, Yuya Takahashi, and Naoya Toyoda. "Dispersion of Nano-materials in Polymer Composite Materials." MATEC Web of Conferences 333 (2021): 11003. http://dx.doi.org/10.1051/matecconf/202133311003.
Full textAbstract:
Polymer composites materials are the subject of extensive studies because of their novel properties compared with their constituent materials. Dispersion stability of sub-micron sized particles in the medium is important from the point of colloidal views. In the present study, dispersion of nano-materials in the matrix polymer is one of the most important problems to enhance their mechanical properties. We tackled this problem to carry out surface modification of the nano-materials, such as carbon nano tubes (CNTs), using amphiphilic polymers, polyNvinylacetamide (PNVA), synthesized thorough radical polymerization. Hydrogen bond worked between PNVA onto the modified nano-materials and hydrophilic matrix, such as polyvinyl alcohol (PVA), to enhance surface adhesions and dispersions of the nano-materials in the matrix. As a result, the mechanical properties of their composites materials were strengthened. When CNTs were used in PVA, the transparency of the composite was also increased due to improvement of their dispersions. In addition, if the CNTs formed the networks in the composites, the highly conductive and transparent polymer composite films were fabricated.
21
Yamamoto, Tetsuya, Yuya Takahashi, and Naoya Toyoda. "Dispersion of Nano-materials in Polymer Composite Materials." MATEC Web of Conferences 333 (2021): 11003. http://dx.doi.org/10.1051/matecconf/202133311003.
Full textAbstract:
Polymer composites materials are the subject of extensive studies because of their novel properties compared with their constituent materials. Dispersion stability of sub-micron sized particles in the medium is important from the point of colloidal views. In the present study, dispersion of nano-materials in the matrix polymer is one of the most important problems to enhance their mechanical properties. We tackled this problem to carry out surface modification of the nano-materials, such as carbon nano tubes (CNTs), using amphiphilic polymers, polyNvinylacetamide (PNVA), synthesized thorough radical polymerization. Hydrogen bond worked between PNVA onto the modified nano-materials and hydrophilic matrix, such as polyvinyl alcohol (PVA), to enhance surface adhesions and dispersions of the nano-materials in the matrix. As a result, the mechanical properties of their composites materials were strengthened. When CNTs were used in PVA, the transparency of the composite was also increased due to improvement of their dispersions. In addition, if the CNTs formed the networks in the composites, the highly conductive and transparent polymer composite films were fabricated.
22
Lushinga, Nonde, Zejiao Dong, and Liping Cao. "Evaluating the High-Temperature Properties and Reaction Mechanism of Terminal Blend Rubber/Nano Silica Composite Modified Asphalt Using Activated Rubber." Nanomaterials 12, no. 24 (December 9, 2022): 4388. http://dx.doi.org/10.3390/nano12244388.
Full textAbstract:
Terminal blend (TB) rubberized asphalt is a popular technology in the production of rubberized asphalt. However, it always presents challenges regarding the inadequate high-temperature rutting performance of the binders. Additionally, crumb rubber (CR), a modifier of asphalt is a cross-linked material which presents poor compatibility between CR particles and bitumen. Incorporating nanomaterials and pretreating CR particles are two possible solutions to address this drawback. But the performance improvement and modification mechanism of the composite TB binders is not clearly understood. Therefore, the purpose of this research was to evaluate the high-temperature properties and reaction mechanism of the TB rubber/nano silica composite modified asphalt using microwave activated rubber. To achieve the research purpose, bitumen penetration grade 80–100 was first modified with 8% CR particles at elevated temperature to produce TB rubberized asphalt followed by the addition of 0.5, 1.5 and 3.0% weight percentage of nano silica to produce TB rubber/nano silica composite modified asphalt. Short and long-term aging tests were performed on samples by thin film oven test (TFOT) and pressure aging vessel (PAV) prior to chemical and rheological tests. The results of the study shows that nano silica has a great influence on the high temperature rutting resistance, storage stability and anti-aging properties of TB rubberized asphalt. Nano silica promoted good interaction and compatibility between CR particles and bitumen and improved the overall rheological properties of the binders. XRD test results revealed that the TB rubberized/nano silica composite modified asphalt samples were amorphous materials and did not have a crystalline structure. The reaction mechanism between rubber and asphalt was found to be physical, whereas nano silica interacted chemically with TB rubberized asphalt. In light of these findings, this research concluded that nano silica evidently improves the high-temperature rutting properties of TB rubberized asphalt, which deserves further exploration and application.
23
Du, Bin, Feng Chen, Rubai Luo, Shisheng Zhou, and Zhengneng Wu. "Synthesis and Characterization of Nano-TiO2/SiO2-Acrylic Composite Resin." Advances in Materials Science and Engineering 2019 (January 3, 2019): 1–7. http://dx.doi.org/10.1155/2019/6318623.
Full textAbstract:
Waterborne acrylic resin is widely used as a binder of waterborne printing ink because of its excellent comprehensive properties. However, its further developments and applications are hindered by its poor UV resistance and water resistance. Therefore, an approach to prepare acrylic resin with excellent UV resistance and water resistance is described in this present study. The nano-TiO2/SiO2 composite particles were first modified with a silane coupling agent (KH-570) and a titanate coupling agent (NDZ-101) and then embedded into acrylic resin via a blending method. Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and thermogravimetry analysis (TGA) were applied to investigate the structure and morphology of the modified nano-TiO2/SiO2 composite particles. The effects of the modified nano-TiO2/SiO2 composite particles on the UV and water resistance of the acrylic resin were investigated by UV spectroscopy and water resistance analysis. The weight loss of modified nano-TiO2/SiO2 was about 20% when heated to 600°C, which indicated that the nano-TiO2/SiO2 composite particles were modified by the coupling agents successfully. The UV-Vis spectra of acrylic resin showed that the UV resistance was improved upon the addition of nano-TiO2/SiO2. The water absorption of the nano-TiO2/SiO2-acrylic resin was less than 5%, indicating that the water resistance of the material was improved.
24
Mo, Zunli, Bin Pu, Shujuan Meng, Chun Zhang, Tingting Xie, and Caidi Jiang. "Synthesis and Characterization of Modified Epoxy Resin/Modified Nano-SiO2 Composite." Advanced Composites Letters 22, no. 2 (March 2013): 096369351302200. http://dx.doi.org/10.1177/096369351302200201.
Full textAbstract:
Modified epoxy resin/modified nano-SiO2 composite was prepared employing urethane acrylate to modify epoxy resin E-44 and silane coupling agent for the modification of SiO2 nanoparticles. The obtained materials were characterized by Fourier Transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), mechanical strength test and hardness test. The composite displayed a significantly increased mechanical properties and great application prospects in dental materials.
25
Horszczaruk, Elżbieta, Paweł Łukowski, and Cyprian Seul. "Influence of Dispersing Method on the Quality of Nano-Admixtures Homogenization in Cement Matrix." Materials 13, no. 21 (October 30, 2020): 4865. http://dx.doi.org/10.3390/ma13214865.
Full textAbstract:
In recent years, a nano-modification of the cement composites allowed to develop a number of new materials. The use of even small amount of nano-admixture makes possible not only to improve the physico-mechanical properties of the cement materials, but also to obtain the composite with high usability, optimised for the given application. The basic problem of nano-modification of the cement composites remains the effectiveness of dispersing the nanomaterials inside the cement matrix. This paper deals with the effect of the type and size of the nanoparticles on the tendency to their agglomeration in the cement matrix. The main techniques and methods of dispersing the nanomaterials are presented. It has been demonstrated, on the basis of the results of testing of three nanomodifiers of 0D type (nano-SiO2, nano-Fe3O4 and nano-Pb3O4), how the structure and properties of the nanomaterial affect the behaviour of the particles when dissolving in the mixing water and applying a superplasticiser. The nanoparticles had similar size of about 100 nm but different physico-chemical properties. The methods of dispersing covered the use of high-speed mechanical stirring and ultrasonication. The influence of the method of nano-modifier dispersing on the mechanical performance of the cement composite has been presented on the basis of the results of testing the cement mortars modified with 3% admixture of nano-SiO2.
26
Chen, Yu Fei, Yi Yue Xiao, Shi Xia Li, and Xu Zhang. "Study on Properties of Epoxy Resins Modified by Nano-Silica." Applied Mechanics and Materials 71-78 (July 2011): 1005–8. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.1005.
Full textAbstract:
Organic precursor of EP/PU was prepared by epoxy resin which was polyurethane toughened, and then modified epoxy resin adhesive was synthesized using nano-silica as modifier. Microstructure of composite materials was observed by scanning electron microscopy (SEM), the results showed that the inorganic phase had good compatibility in polymer matrix, and polyurethane in epoxy resin have formed the "island structure". The mechanical properties, thermal stability and dielectric loss, dielectric constant of composites were investigated. The results indicated that doping of appropriate amount of nano-silica could improve mechanical property, shear strength and impact strength of 2wt% SiO2/EP-PU were increased 173% and 106.67%, than that of pre-doping of composite, respectively. Thermal decomposition temperature (Td) was increased, Tdof 2wt%SiO2/EP-PU was increased 8.1°C than that of pre-doped of material. Dielectric constant (ε) was as follows: was decreased with the increase of frequency, but increased with the increase of inorganic component, dielectric loss (tanδ) was increased with the increase of frequency and inorganic doping.
27
Muntenita, Cristian, Adrian Circiumaru, Vasile Bria, Cezar Ionut Bichescu, and Iulia Graur. "Functional Surfaces Modified with Gelatin and TIO2 Nanoparticles." Materiale Plastice 55, no. 3 (September 30, 2018): 258–62. http://dx.doi.org/10.37358/mp.18.3.5009.
Full textAbstract:
The paper presents the obtaining of zinc and zinc composite coatings using electrochemical TiO2 nanoparticles as well as the determination of the influence of gelatin used as an additive on electrically co-deposited layers. The obtained coatings were studied at the electronic scanning microscope (SEM) for microstructure observation. A distinction was made between the pure zinc electro-deposed layer and the influence of nano-TiO2 on the morphology of zinc nanocomposite layers Zn/nano-TiO2, as well as the determination of the degree of inclusion of nano particles of TiO2 into the zinc matrix. It was confirmed that with the introduction of nano-TiO2, both the roughness of the electro-deposed layer and the micro hardness of the electro-deposed layer significantly increased compared to the micro hardness of the pure zinc electro-deposed layers confirming the existence and beneficial effects of nano-TiO2 in electro-co-deposed nano-composite layers.
28
Krueson, Nidchakarn, H. Manuspiya, Pitak Laoratanakul, and H. Ishida. "Dielectric Properties Enhancement in Polybenzoxazine Composite at Multi-Frequency Range." Advanced Materials Research 55-57 (August 2008): 105–8. http://dx.doi.org/10.4028/www.scientific.net/amr.55-57.105.
Full textAbstract:
This research proposed a novel nano barium strontium titanate (BST) powder- polybenzoxazine composite as a new dielectric material. In this work, the dielectric properties of a surface-treated BST powder-polybenzoxazine composite were studied. The surface of the BST powders were modified by using three different chemicals: 3-aminopropyl-trimethoxysilane, benzoxazine monomer and phthalocyanine. The distribution of the BST powders in the polybenzoxazine matrix was observed by SEM. The dielectric constants of the composites with a function of frequency (1 kHz–10 MHz) were investigated. It was found that the composites with modified BST powders showed good distribution in the polybenzoxazine matrix, and the dielectric constants were also much enhanced than those with untreated BST powders. In comparisons among the three modification methods, the composite with the silane coupling modified BST powder showed significantly in dielectric constant improvement while the composite with the benzoxazine and phthalocyanine modified BST powders displayed lower dielectric loss due to the modified powder dispersed well in the polybenzoxazine matrix.
29
Wang, Xue Jun, Tao Lou, Xiu Ting Lang, and Guo Jun Song. "Fabrication of Nano-Fibrous Poly(L-Lactic Acid) Scaffold Enhanced by Silane Modified Chitosan Fibers." Applied Mechanics and Materials 152-154 (January 2012): 609–12. http://dx.doi.org/10.4028/www.scientific.net/amm.152-154.609.
Full textAbstract:
In this study, A PLLA/silane modified chitosan fiber composite scaffold was sucessfully prepared using thermal induced phase separation method. The PLLA was chemically coupled with chitosan fiber surface using γ-methacryloxypropyl-trimethoxysilane.The composite scaffold had a nano-fibrous PLLA matrix (fiber size 200-750 nm), an interconnective pores ((1-6 μm), high porosity (>90%). Introduced surface modified chitosan fibers into PLLA matrix, it significantly enhanced the nano-fibrous scaffold. The new nano composite scaffold is potentially a very promising scaffold for tissue engineering.
30
Abdrakhmanova, L. A., A. G. Khantimirov, R. K. Nizamov, and V. G. Khozin. "WOOD-POLYMER NANO-MODIFIED POLYVINYLCHLORIDE COMPOSITE BUILDING MATERIALS." Vestnik MGSU, no. 4 (April 2018): 426–34. http://dx.doi.org/10.22227/1997-0935.2018.4.426-434.
Full text
31
Wang, Shuli, Jiankang Zhu, Yongchao Rao, Beibei Li, Shuhua Zhao, Haoran Bai, and Jiawei Cui. "Polydopamine Modified Graphene Oxide-TiO2 Nanofiller for Reinforcing Physical Properties and Anticorrosion Performance of Waterborne Epoxy Coatings." Applied Sciences 9, no. 18 (September 9, 2019): 3760. http://dx.doi.org/10.3390/app9183760.
Full textAbstract:
Nano-polydopamine-graphene oxide-TiO2 (nano-PDA@GO-TiO2) composites were prepared by dopamine modified graphene oxide (GO) and loaded nano-TiO2 on the surface of GO. The structure and morphology of nano-PDA@GO-TiO2 composites were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Raman, X-ray photoelectron spectroscopy (XPS), Scanning electron microscope (SEM), and Transmission electron microscope (TEM) Results demonstrate that the introduction of dopamine to functionalize the GO could self-polymerize polydopamine (PDA) on the surfaces of the GO and endow abundant chemical groups reduce the GO. The interaction between the GO and nano-TiO2 particles could prevent graphene nanosheets from restacking and nano-TiO2 particles from agglomeration. Nano-PDA@GO-TiO2 composite material was used as the nano-filler, and nano-PDA@GO-TiO2 composites waterborne epoxy resin coatings (PGT/WEP) were prepared by dispersing a different content of nano-PDA@GO-TiO2 composites into waterborne epoxy resin with the help of ultrasonic dispersion and mechanical agitation. The physical properties of PGT/WEP coatings, such as hardness, impact resistance, and adhesion, were tested and the electrochemical performance was evaluated. The results show that dispersing 2% nano-PDA@GO-TiO2 composites in waterborne epoxy resin could significantly improve the physical properties and corrosion resistance of waterborne epoxy resin coating when compared with pure waterborne epoxy coating.
32
Luo, Ming Liang, Jia Lin Liu, Hong Jian Liu, and Zi Long Jia. "Electrokinetic Phenomena of Sulfonated-Polyethersulfone Ultrafiltration Membrane Modified by TiO2 Nanoparticles." Advanced Materials Research 152-153 (October 2010): 639–42. http://dx.doi.org/10.4028/www.scientific.net/amr.152-153.639.
Full textAbstract:
The sulfonated-polyethersulfone (SPES)/nano-TiO2 composite ultrafiltration (UF) membranes were prepared by phase inversion method with nano-TiO2 as additive. The TiO2 self-assembly on the SPES membrane was confirmed by FT-IR and the isoelectric point’s analysis (IEPs). The electrokinetic phenomena of composite membrane in the different single electrolyte solution were investigated by the streaming potential method. The results showed that the IEP of the SPES-UF membrane modified by nano-TiO2 shifts from 3.5 to 2.9, and the composite membrane shows a stronger electronegativity, which indicates the antifouling performance improvement of the SPES-UF membrane modified by nano-TiO2. The valences of the cations and anions have an important influence on the streaming potential of the composite UF membrane.
33
Wei, Fengjun, Bingli Pan, and Juan Lopez. "The tribological properties study of carbon fabric/ epoxy composites reinforced by nano-TiO2 and MWNTs." Open Physics 16, no. 1 (December 31, 2018): 1127–38. http://dx.doi.org/10.1515/phys-2018-0133.
Full textAbstract:
Abstract A kind of carbon fabric/epoxy composite was successfully prepared with carbon fiber fabric as reinforced phase and epoxy resin as binder phase, then the nano-TiO2 and a hybrid system of TiO2/MWNTs was added into the carbon fabric/ epoxy composite matrix respectively to prepare a kind of nano-composite. The friction and wear properties of CF/EP composites under different load conditions have been studied in this article, during the study the effects of filler types and contents on the tribological properties were researched, at last the worn surfaces were investigated and the abrasion mechanism was discussed. The results showed that: whether filling the nano-TiO2 alone or mixing the TiO2/MWNTs, it was able to achieve a good effect on decreasing friction and reducing wear, and the optimum addition ratio of the nano-TiO2 particles was 3.0% , meanwhile 3.0% of nano-TiO2 and 0.4% of MWNTs could cooperate with each other in their dimension, and could show a synergistic effect on modifying the tribological properties of CF/EP composites, the coefficient of friction of the modified composites decreased by 20% and the wear life increased by more than 140% compared with that of pristine composite materials, in the process of friction and wear, the wear form of the composites materials varied from brittle rupture to abrasive wear gradually.
34
Xie, Zhimin, Junjie Fei, and Meihua Huang. "Differential Pulse Anodic Stripping Voltammetric Determination of Cadmium(II) at a Glassy Carbon Electrode Modified with a Nano-TiO2/Chitosan Composite Film." Australian Journal of Chemistry 61, no. 12 (2008): 1000. http://dx.doi.org/10.1071/ch08353.
Full textAbstract:
A simple and effective chemically modified electrode for the determination of cadmium(ii) was developed. The chemically modified electrode was prepared by modifying nano-TiO2/chitosan (nano-TiO2/CS) composite film onto a glassy carbon (GC) electrode. Compared with a bare GC electrode and a CS film-modified GC electrode, the nano-TiO2/CS composite film-coated GC electrode significantly improved the sensitivity of determining CdII. The effects of experimental parameters such as modifier composition in the GC electrode, pH of supporting electrolyte, accumulation potential and time were studied for analytical application. Under the optimized working conditions, the peak currents were linear with concentration over the range from 1.0 × 10–9 to 1.0 × 10–6 mol L–1 for CdII. The limit of detection is 2.0 × 10–10 mol L–1 CdII for 180-s accumulation. The application for the assay of trace levels of CdII in real water samples indicates that it is an economical and potent method.
35
Chang, Huey Ling, and Chih Ming Chen. "The Thermal Properties of Modified Nano-Silica with Diluent/Epoxy Composites." Advanced Materials Research 677 (March 2013): 49–54. http://dx.doi.org/10.4028/www.scientific.net/amr.677.49.
Full textAbstract:
In this paper, we present the function of the processing conditions (the amount of filler or diluent in epoxy resin, whether post-curing or not) in thermal properties of the modified silica/epoxy nano-composite materials based on thermal gravimetric analysis (TGA).The results is showed that after post-processing for the nanocomposite materials have a better thermal properties, and adding 3.2wt.% epoxy diluent can be taken a convenience operation, but has a negative effect on thermal properties. Nano-composite materials of diluent 3.2 wt.% plus nano-silica powder 2 wt.% will reach pyrolysis temperature 278.66°C. This reinforcement reaches the highest level observed of the decomposition temperatures of 2wt.% silica filler with no diluent cases nano-composite materials, after post-processing the decomposition temperatures could be enhanced to pyrolysis temperature 308.69 °C.
36
LARI BAGHAL, S. M., M. HEYDARZADEH SOHI, and A. AMADEH. "ANALYSIS OF MECHANICAL PROPERTIES AND MICROSTRUCTURE OF NANO-STRUCTURED NI-CO/SIC COMPOSITE PREPARED BY ELECTRODEPOSITION." International Journal of Modern Physics: Conference Series 05 (January 2012): 615–21. http://dx.doi.org/10.1142/s2010194512002541.
Full textAbstract:
Ni - Co / SiC nano-composites were prepared by electrodeposition in modified watts bath. The average size of SiC particles was 50 nm. In this study the effect of nano-particle incorporation, Co 2+ and saccharin concentration in electroplating bath on morphology and mechanical properties of Ni - Co / SiC nano-composites were investigated. The electrodeposits were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), Vickers micro-hardness and tensile tests. The results indicate that an increase in Co 2+ and saccharin concentration in electrolyte lead to a decrease in size of SiC agglomerates and grain size refining of matrix and improvement in mechanical properties. The hardness, tensile and yield strengths of the nano-composite material with nano-structure matrixes were higher than those for microcrystalline ones.
37
Chen, He, Shuai Zhang, Xin Cai, and Mingzhu Pan. "Effects of APP/SiO2polyelectrolyte composites on wood-plastic composite." MATEC Web of Conferences 275 (2019): 01004. http://dx.doi.org/10.1051/matecconf/201927501004.
Full textAbstract:
This paper was aimed to evaluate process of APP/SiO2, which used Nano-crystalline cellulose (NCC) modified ammonium polyphosphate (APP) as anionic polyelectrolyte (a-APP), and cationic polyethyleneimine (PEI) modified Nano–SiO2as cationic polyelectrolyte (c-SiO2). The flame retardant system was built due to the reaction of a-APP and c-SiO2. Polyelectrolyte composite of a-APP/c-SiO2were then assembled on the surface of wood powder and HDPE composites. The effect of polyelectrolytes on wood-plastic composites (WPC) were investigated and the results showed that the flame-retardant property of WPC treated by polyelectrolyte was the best. The average heat release rate was 152.8kW/m2, the peak heat release rate was 352.2kW/m2, the total heat release was 108.5kW/m2, the limit oxygen index reached the maximum was 27.5%, compared with the WPC treated by APP, the elongation at break increased by 60.4%. After anionic and cationic polyelectrolyte treatment, making anionized a-APP and cationized c-SiO2due to the charge interaction, in the WPC combustion process to form a dense, uniform WPC carbon layer, thereby reducing the heat transfer to the material inside, and increasing the flame retardancy of WPC composites.
38
Rajanish, M., N. V. Nanjundaradhya, Ramesh S. Sharma, and H. K. Shivananda. "Alumina Nanoparticles Enhance the Directional Tensile Properties of Glass/Epoxy Composite." Advanced Composites Letters 25, no. 1 (January 2016): 096369351602500. http://dx.doi.org/10.1177/096369351602500103.
Full textAbstract:
In this paper, diglycidyl ether of bisphenol A (DGEBA) / triethylene tetramine (TETA) system is used as the starting epoxy matrix and alumina nanoparticles at various concentrations (0.2wt%, 0.4wt%, 0.6wt%, 0.8wt% and 1.0wt%) are employed to modify the epoxy matrix. The UD (unidirectional) glass fibres are used along with the unmodified and modified epoxy resins for fabricating the composite laminates by hand layup process followed by vacuum bagging. The tensile properties of the composite such as tensile strength and tensile modulus are investigated along the longitudinal, transverse direction and also at 45° orientation of fibres using a universal testing machine. From the results, it is found that tensile modulus of the composites was influenced much by the addition nano-fillers while the tensile strength was found to be less altered. Also, the present study showed that nano-modified composites exhibit significantly improved tensile properties along the transverse direction while the properties along the longitudinal direction were not affected much by the nano-fillers due to the dominating effect of the fibres. The maximum enhancement of tensile modulus and tensile strength was found to be 8.85% and 3.72% in the composite having 0.6wt% of alumina nanoparticles in the transverse direction. Further addition of nanoparticles decreased the properties, which were explained with the concept of agglomerations formed by the nanoparticles in the matrix which weakens the mechanical properties. The graphs are employed to explain the results. Hence, to obtain a best possible design, the properties of the fibre reinforced nano-composite laminate at different angles are to be considered as continuous variables in a design process.
39
Gong, Yafeng, Haipeng Bi, Zhenhong Tian, and Guojin Tan. "Pavement Performance Investigation of Nano-TiO2/CaCO3 and Basalt Fiber Composite Modified Asphalt Mixture under Freeze‒Thaw Cycles." Applied Sciences 8, no. 12 (December 12, 2018): 2581. http://dx.doi.org/10.3390/app8122581.
Full textAbstract:
The objective of this research is to evaluate the pavement performance degradation of nano-TiO2/CaCO3 and basalt fiber composite modified asphalt mixtures under freeze‒thaw cycles. The freeze‒thaw resistance of composite modified asphalt mixture was studied by measuring the mesoscopic void volume, stability, indirect tensile stiffness modulus, splitting strength, uniaxial compression static, and dynamic creep rate. The equal-pitch gray prediction model GM (1, 3) was also established to predict the pavement performance of the asphalt mixture. It was concluded that the high- and low-temperature performance and water stability of nano-TiO2/CaCO3 and basalt fiber composite modified asphalt mixture were better than those of an ordinary asphalt mixture before and after freeze‒thaw cycles. The test results of uniaxial compressive static and dynamic creep after freeze‒thaw cycles showed that the high-temperature stability of the nano-TiO2/CaCO3 and basalt fiber composite modified asphalt mixture after freeze‒thaw was obviously improved compared with an ordinary asphalt mixture.
40
Vidya, S., K. C. Mathai, P. P. Rejith, Sam Solomon, and J. K. Thomas. "SmBa2NbO6Nanopowders, an Effective Percolation Network Medium for YBCO Superconductors." Advances in Materials Science and Engineering 2013 (2013): 1–7. http://dx.doi.org/10.1155/2013/578434.
Full textAbstract:
The percolation behavior of superconductor-insulator composite, YBa2Cu3O7–δ, and nano SmBa2NbO2synthesized by modified combustion technique was studied. Particle size of nano SmBa2NBO6was determined using transmission electron microscopy. The chemical nonreactivity of nano SmBa2NbO6with YBCO is evident from the X-Ray diffraction study which makes it a suitable nanoceramic substrate material for high temperature superconducting films. A systematic increase in the sintered density, approaching the optimum value of the insulating nanophase is clearly observed, as the vol.% of YBCO in the composite decreases. SEM micrograph showed uniform distribution of nanopowder among the large clusters of YBCO. The obtained percolation threshold is~26 vol% of YBCO in the composite. All the composites below the threshold value showedTC(0)~92 K even though the room resistivity increases with increase in vol.% of nano SmBa2NbO6. The values of critical exponents obtained matches well with the theoretically expected ones for an ideal superconductor-insulator system.
41
Bao, Yan, Ma Jianzhong, and E. Tao. "Preparation of Poly (Methacrylic Acid-Ethanolamine Modified Maleic Anhydride)/Montmorillonite Nano-Composite Using Initiator-Montmorillonite Hybrid." Advanced Composites Letters 22, no. 1 (January 2013): 096369351302200. http://dx.doi.org/10.1177/096369351302200101.
Full textAbstract:
2,2′-Azobis (2-methylpropionamidine) dihydrochloride-montmorillonite (AIBA-MMT) hybrid was prepared by cationic exchange between the Na+ ion in the MMT galleries and the quaternary ammonium of the azo-initiator. Then the methacrylic acid-ethanolamine modified maleic anhydride copolymer/montmorillonite [P(MAA-EMA)/MMT] nano-composite was prepared via in-situ polymerization method using above AIBA-MMT hybrid. The structures of AIBA-MMT hybrid and P(MAA-EMA)/MMT nano-composite were characterized with X-ray diffraction (XRD), thermogravimetric analysis (TGA) and transmission electron microscopy (TEM). The interlayer d-spacing of AIBA-MMT was 1.50 nm. The amount of the initiator intercalated into the clay galleries was 0.508g/gMMT. The P(MAA-EMA)/MMT nano-composite was categorized as exfoliated and intercalated one. The application results of P(MAA-EMA)/MMT nano-composite for leather tanning indicated that nano-composite can improve the wet-heat resistance temperature of collagen and facilitate the absorption of chromate.
42
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.
Full textAbstract:
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.
43
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.
Full textAbstract:
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.
44
Han, Nian Feng, De Jie Zhou, and Xin De Tang. "Effect of Nano Calcium Carbonate and Montmorillonite on Properties of Styrene–Butadiene–Styrene Copolymer Modified Asphalt." Applied Mechanics and Materials 99-100 (September 2011): 1035–38. http://dx.doi.org/10.4028/www.scientific.net/amm.99-100.1035.
Full textAbstract:
Composite modified asphalts with nano calcium carbonate (nano CaCO3)/ SBS and nano montmorillonite (nano MMT)/SBS were prepared respectively by melt blending. Rolling thin film oven test (RTFOT) was carried out to study the aging properties. The results demonstrate that CaCO3/SBS and MMT/SBS homogeneously disperse in the base asphalt, which lead to an improvement in terms of toughness, strength, and thermal stability. Effects of the nano CaCO3 and nano MMT on the properties of SBS modified asphalt appear as a decreasing penetration, an increasing softening point, and a decreasing ductility. The anti-aging property of the nano MMT/SBS modified asphalt was better than that of the CaCO3/SBS modified asphalt and SBS modified asphalt.
45
Goodarz, Mostafa, Hajir Bahrami, Mojtaba Sadighi, and Saeed Saber-Samandari. "Quasi-static indentation response of aramid fiber/epoxy composites containing nylon 66 electrospun nano-interlayers." Journal of Industrial Textiles 47, no. 5 (November 25, 2016): 960–77. http://dx.doi.org/10.1177/1528083716679158.
Full textAbstract:
In the last decade, polymer nanofibers have found promising application for improving through-thickness properties of structural composite laminates through interleaving. The main advantage of inserting nanofibers in conventional composites is making the matrix between the layers tougher. In this article, the benefits of using electrospun fibrous nano-interleaves in enhancing the quasi-static indentation response of aramid/epoxy laminated composites was investigated and the effect of variables of produced nano-interleaves including interleaf thickness (17.5, 35, and 70 µm) and stacking configuration (one-side, central, and two-side interleaving) on behavior of the nano-modified composites was investigated. The results indicate that force, displacement, absorbed energy, and stiffness of these composites are significantly affected by the presence of nano-interleaves. The optimum values were observed in the composites with 35 µm thickness of nano-interleave where three first parameters were higher than their reference values, but the stiffness value had opposite trend of other parameters. On the other hand, it can be seen that only asymmetrical (back-side indentation) stacking configuration lead to improving the composite properties. The visual inspection of the indentation damaged specimens reveals that thickness and stacking configuration of interleaves controls the size of damage.
46
Liu, Xiao Qi, Xue Chen Duan, Ming Hui Shen, and Jie Nan Chen. "Application of Attapulgite Clay Mineral Modified by Flame Retarder in Green Building Materials." Advanced Materials Research 298 (July 2011): 226–42. http://dx.doi.org/10.4028/www.scientific.net/amr.298.226.
Full textAbstract:
In this thesis, the composite of aluminum hydroxide on the surface of natural one-dimensional nano minerals and the nanocrystallization of inorganic flame retarder (aluminium hydroxide) are achieved by hydrothermal method. The obtained nano-composite flame retarder is applied in the preparation of straw based panel to improve its flame retardant performance. After ultrasonic dispersion and complex purification with the addition of EDTA, the crude attapulgite clay minerals is put in acid solution of PH 2 or 3, where the surface of the complex is modified with the addition of cetyl trimethyl ammonium bromide (CTAB).Then add into it aluminum hydroxide of different amounts, to start the hydrothermal composite reaction and get aluminum hydroxide/ nano-attapulgite composite flame retarder. After the characterization by SEM the best hydrothermal reaction conditions for preparing aluminum hydroxide/attapulgite are obtained. The prepared nano composite flame retarder, the PF adhesive and straw shavings are mixed in different proportions and made into straw based panel by hot pressing. Then the study on the flame retardant performance and the mechanical properties of the straw based panel is carried out.
47
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.
Full textAbstract:
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.
48
Bao, Xu Xu, Yuan Li, Akira Teramoto, and Koji Abe. "Carboxymethyl Chitosan/Hydroxyapatite Composite Scaffold for Bone Regeneration." Advanced Materials Research 123-125 (August 2010): 299–302. http://dx.doi.org/10.4028/www.scientific.net/amr.123-125.299.
Full textAbstract:
Natural bone is a composite mainly made from nano/micro-structure of hydroxyapatite and collagen fibers. For bone regeneration by tissue engineering, it is important to synthesize nano-composites with good biocompatibility, high bioactivity and great bonding property as potentially useful scaffold. In this study, we fabricated chitosan nano-nonwoven scaffold via electrospinning and modified chitosan scaffolds by carboxymethylation (CM). Moreover scaffolds were macerated in SBF (simulated body fluid) to form hydroxyapatite on its surface. Surface morphologies (SEM) showed that nano/micro particles formed on the surface of the carboxymethyl chitosan fibrous scaffold. Results of FT-IR and XRD confirmed that the nano/micro particles were hydroxyapatite crystalline. Moreover by employed mice osteoblast (MC3T3-E1) cell for adhesion, proliferation and differentiation assays, and the hydroxyapatite particles appeared to have a great effect on the late stages of osteoblast behavior (alkaline phosphatase ).
49
Li, Ya Na, Kyong Ho Cha, and Qing Hui He. "Preparation and Properties Research of Modified Nano-ZnO/HDPE Composite Films." Advanced Materials Research 174 (December 2010): 450–53. http://dx.doi.org/10.4028/www.scientific.net/amr.174.450.
Full textAbstract:
Nanocomposite films of ZnO/HDPE were prepared via melt blending and hot compression molding process. The morphology, DSC, mechanical and barrier properties of the films were investigated. The results showed that a better dispersion of modified nanoparticles at content of 0.5wt% in HDPE matrix occurred and the improvement of the HDPE films in tensile strength and tear strength was achieved by incorporating modified-ZnO nanoparticles up to 0.5wt% in contrast with the original nano-ZnO/HDPE composite films. It was also found that the addition of modified nano-ZnO to neat HDPE caused to increase crystallinity and enhance the barrier property of nano-ZnO/HDPE composite films against water vapor and oxygen.
50
Wang, Xiao Hui, Li Min Dong, Ren Li Wang, and Han Fei Lu. "Study on Synthesis of In Situ Composite of Nano-SiO2 and Vinyl Acetate-Acrylate Emulsion." Applied Mechanics and Materials 584-586 (July 2014): 1695–99. http://dx.doi.org/10.4028/www.scientific.net/amm.584-586.1695.
Full textAbstract:
Commercially available nanosilica was modified with silane coupling agent A-151, and then emulsion was synthesized with modified SiO2, vinyl acetate, methyl methacrylate and butyl acrylate by polymerization reaction. Effects the amount of emulsifier, initiator and organic nano-SiO2, etc factors on the performance of emulsion polymerization and latex film were investigated. The best test results of composite emulsion of SiO2and vinyl acetate-acrylate were obtained by theoretical research and experimental operation: modified nano-SiO2content of 3%, emulsifier the content of OP of 3%, potassium persulfate content of the initiator of 0.5%. By infrared spectroscopy, surface of the SiO2had been changed, which showed the performance of situ composite of modified nano-SiO2 and vinyl acetate-acrylate emulsion had been significantly improved.