Dissertation > Excellent graduate degree dissertation topics show

Irradiation Property of WS2Nanotubes and Carbon Nanotubes

Author: DingKeWang
Tutor: FengYi
School: Hefei University of Technology
Course: Materials Science
Keywords: WS2nanotubes/powders Carbon nanotubes Irradiation Structural changes Radiation damage mechanism
CLC:
Type: Master's thesis
Year: 2013
Downloads: 45
Quote: 0
Read: Download Dissertation

Abstract


WS2nanomaterials have better performance than traditional WS2materials, sothey have a wide range of application areas. For example, WS2nanotubes haveexcellent lubricating properties under the vacuum environment. They are suitablefor satellite and aircraft, which require lubrication and work in space environment.Therefore, the study of WS2nanotubes irradiated by various rays and particles inspace becomes very important.This paper mainly studies the effect of gamma ray, electron beam and ion beamirradiation on WS2nanotubes/powders. Meanwhile, we add some carbon nanotubesirradiation experiments, comparing the radiation hardness of WS2nanotubes andcarbon nanotubes.The WS2nanotubes/powders, carbon nanotubes are irradiated by gamma ray.The irradiation doses are200kGy,2MGy. The study finds that the effect of gammairradiation on carbon nanotubes is very obvious. With the increase of the irradiationdose, carbon nanotubes experience the process of destruction-damage tosaturated-recovery. However, WS2nanotubes are barely affected by theγ-irradiation. The crystallinity of WS2powders becomes better after irradiation.The ability of anti-gamma irradiation of WS2nanotubes is stronger than that ofcarbon nanotubes.The WS2nanotubes/powders, carbon nanotubes are irradiated by electron beam.The results show that the WS2nanotubes are destroyed from the outer layer to theinside. The displaced atoms can leave the irradiated area by sputtering events or bydiffusive migration along the shells and the inner hollow. The smaller tubes have alower stability. The stability of the tube increases after the central hollow is closed.The asymmetric irradiation can lead to a bending of the tube and irradiation ofcrossed WS2nanotubes is shown to give rise to nanotube welding. In addition,electron irradiation causes the change of WS2nanotubes into a polycrystallinestructure. The dangling bonds on the surface increase. When the electron beamstrikes the carbon nanotube, first the center hole is closed and then shrink, thecarbon onion structure is appeared on the surface. The ability of anti-electronirradiation of WS2nanotubes is stronger than that of carbon nanotubes. Thedestruction of the electron beam on WS2powders is a sputtering event. The WS2piece is stripped layer by layer.The WS2nanotubes/powders are irradiated by ion beam. The irradiation dosesare1015,1016,1017ions/cm2. The effect of ion irradiation on WS2nanotubes is veryobvious. With the increase of the irradiation dose, the thickness of the sputteredlayer of WS2nanotubes increases. The ion irradiation can make the WS2react withthe oxygen which can be chemisorbed on the defects and dangling bonds of thenanotube to form WO3and the content of WO3increases with the increase of the irradiation dose. Similar to the electron irradiation, ion irradiation can also lead tothe fact that the unsaturated dangling bonds on the edge of the nanotube increase,which can increase the surface activity of nanotube. The surface of the WS2sheetforms a pit under the high dose irradiation due to the ion sputtering effect.

Related Dissertations

  1. Studies on the Physiology and Biochemistry Characteristics and Fresh Keeping Technology of Post-Harvest in Pleurotus Eryngii,S646
  2. Carbon Nanotubes Compound Polymer Film Modified Electrode and Its Application for Electroanalytical Chemistry,O657.1
  3. SnO 2 / CNTs composite Controllable Preparation and Gas Sensitivity Study,TB383.1
  4. Determination of Trace Sulfonamides Residues in Animal Food,S859.84
  5. Preparation and Properties of Reinforcements/ Polyacrylonitrile Composite Nanofibers,TB383.1
  6. Differential Expression Profiles of microRNA Induced by Ionizing Radiation and Its Regulating in Radiation Damage Response,R144
  7. Prepration of Manganses Dioxide and Investigation on the Performance of Supercapacitor,TM53
  8. Synthesis of Platinum-based Composite Catalysts and Their Electrocatalytic Properties for Methanol Oxidation,TM911.4
  9. The Experimental Effect of DNA Methylation Induced by Ionizing Radiation,R818
  10. Studies on Proparation and Property of TPP Retarded Epoxy/CNT Composites,TB383
  11. The Evaluation of Discoloration of Culture Relics Pigments and Silk under UV Irradiation with Molecular Spectroscopy,O657.33
  12. Preparation and Application of Three Dimensional Reinforcements with Carbon Nanotubes Grown on the Fiber Surfaces in Situ,TB383.1
  13. Study on the Preparation and Characterization for the CNT Laminated Film Based on PAN Precursors,TB383.2
  14. Preparation of Functional Multi-walled Carbon Nanotubes for Using in Electrochemical Capacitor Materials and Its Electrochemical Performance,TB383.1
  15. Studies of High Refractive Index Materials Prepared by Nano ZrO2 and TiO2 Hybrid Silicone Epoxy Resin,TB383.1
  16. The Study of the New-Nanopharmaceutical-The Dispersibility of Carbon Nanotubes as Drug Carriers,TB383.1
  17. Synthesis of Carbon Nanotubes/ Titanium Dioxide Composite Photocatalyst by Fluidized Bed Chemical Vapor Deposition (FBCVD) and Its Photocatalytic Properties,TB383.1
  18. Determination of Phenolic Compounds by High Performance Liquid Chromatography in Waters with Solid Phase Extraction on Carbon Nanotubes,O661.1
  19. Buckling Behavior of Carbon Nanotubes under Simple and Combined Loading,TB383.1
  20. Research on Multi-functional Magnetic Membrane Based on Bacterial Cellulose,TB383.2
  21. Voltammetric Monitoring Degradation of EDTA Based on Carbon Nanomaterials Modified Electrode,TB383.1

CLC: >
© 2012 www.DissertationTopic.Net  Mobile