Dissertation > Excellent graduate degree dissertation topics show

Zn2GeO4-En Hybrid Nanoribbons and Their PMAA Based Composite Nanomaterials: Synthesis, Characterizations and Applications

Author: YuLi
Tutor: HuJunQing
School: Donghua University
Course: Polymer Chemistry and Physics
Keywords: hybrid nanomaterials Zn2GeO4-ethylenediamine hybrid nanoribbons poly-(methacrylic acid) distillation-precipitation polymerization
CLC: TB383.1
Type: Master's thesis
Year: 2012
Downloads: 47
Quote: 0
Read: Download Dissertation

Abstract


With the development of nanotechnology, multi-functional inorganic-organic hybrid materials have attracted considerable attention during past few decades, and inorganic-organic hybrid nanomaterials have been widely used in electronics, chemistry, biology, aviation, etc., because of their combination properties of inorganic, organic and nanomaterials. So it is vitally important to discover and study inorganic-organic hybrid nanomaterials that have tremendous fascinating properties.In this paper, synthesis, characterizations and applications of inorganic-organic hybrid nanoribbon (Zn2GeO4-ethylenediamine), inorganic-organic molecules-polymer hybrid nanoribbons (PMAA@Zn2Ge04-ethylenediamine), inorganic-polymers hybrid nanospheres (PMAA@SiO2, and SiO2@PMAA@SiO2) have been totally discussed. The structures and properties of these hybrid nanomaterials were characterized and studied by X-ray diffraction (XRD), Fourier translation infrared (FT-IR), thermogravimetric analysis (TGA), scanning electron microscope (SEM), transmission electron microscope (TEM), high resolution transmission electron microscope (HRTEM), X-ray photoelectron spectroscopy (XPS), ionic coupled plasma-atomic emission spectroscopy (ICP-AES). Generally, some achievements within this thesis were listed as follows:(1) Ultralong Zn2GeO4-ethylenediamine hybrid nanoribbons were synthesized by a moderate solvothermal route using ethylenediamine as medium reagent, and their ultralong, ultrathin and temperature resistance properties were confirmed by referred characterizations.(2) Zn2GeO4-ethylenediamine hybrid membranes were produced by self-assembly process with good mechanical and recyclable properties, high selectivity and adsorption capacity. In the binary mixture systems contain Pb2+/Cu2+、Pb2+/Cd2+、Pb2+/Co2+、Cu2+/Cd2+、Cu2+/Co2+、Cd2+/Co2+, and ternary mixtures such as Pb2+/Cu2+/Cd2+、Pb2+/Cu2+/Co2+、Pb2+、Cd2+/Co2+、Cu2+/Cd2+/Co2+, and in Pb2+/Cu2+/Cd2+/Co2+ mixture systems, the membranes showed high adsorption capacity to Pb2+. With the increase of the concentration of heavy metal ions, the adsorption efficiency also increased, namely, ranging from 58.7 to 71.3 and 74.6 mg g-1 with the initial concentration increasing from 2.5 to 5.0 and 10 mM under condition of 15℃within one hour. When disodium EDTA used as an eluent, the desorption efficiency of the membrane can reach as high as 94%, that’s exactly why it showed good recyclability. Mechanism of adsorption and desorption process indicate that its adsorption properties of heavy metals can be attributed to their organic ethylenediamine molecules which have chelation effect, suggesting that lots of-NH2 groups in EDA molecules within the hybrid nanoribbons have an intimate contact with metal ions. e.g., Pb2+, in solutions; however, when the membranes were eluted by the disodium EDTA solution, stronger coordination ligands in the disodium EDTA would have a stronger bonding with Pb2+, made Pb2+ easily desorb from the membranes.(3) We first successfully synthesized inorganic-organic molecules-polymer hybrid nanoribbons (PMAA@Zn2GeO4-ethylenediamine) by radical polymerization method using methacrylic acid (MAA) as monomer, azobisisobutyronitrile (AIBN) as initiator, ethylene glycol dimethacrylate (EGDMA) as crosslinking agent. This simple and easy method provides a new synthesis and research access to other similarly important functional hybrid nanomaterials.(4) SiO2 nanospheres were firstly modified by 3-(trimethoxysilyl) propylmethacrylate and then their external surfaces were coated with a layer of functional polymer PMAA by distillation-precipitation polymerization method, forming a PMAA@SiO2 nanospheres structure. Secondly, novel SiO2@PMAA@SiO2 yolk-shell structure nanoparticles were obtained by sol-gel route using PMAA@SiO2 nanospheres as precursor, and their microstructures and compositions were thoroughly characterized. These nanomaterials are expected to be used in drug delivery.

Related Dissertations

  1. Phthalocyanine polymer magnetic composites,O482.54
  2. Nanoparticles Modified via Surface RAFT Polymerization and Their Application,TB383.1
  3. Synthesis and Properties of Monodisperse Crosslinked Polystyrene Microspheres,O631.3
  4. Fabrication of Supramolecular Assemblies and Functional Materials Based on Responsive Polymers,O631
  5. The Synthesis, Properties Study and Computer Simulation of Polymers Based on N, N-diethylacrylamide,O631.3
  6. Preparation and Application of Controlled Functional Gold Nanotube Membranes,TB383.1
  7. Preparation and Characterization of Dual Sensitive Graft Copolymer,TQ317
  8. Preparation and Infrared Performance of Multi-phase Change Temperature-microcapsule,TB34
  9. Preparation, Characterization and Bioapplication of Multifunctional Organic/Inorganic Polymer Microspheres,O631.3
  10. Environment-sensitive Interpenetrating Polymer Network Hydrogels Based on Silk Sericin for Drug Controlled Delivery,TQ460.1
  11. Preparation of ITO Quai-1D Nanostructures by Sol-Gel Method Combined with Porous Anodic Aluminum Oxide Template,TB383.1
  12. Study on the Synthesis Bi3.25La0.75Ti3O12(BLT) Nanotubes and Nano Wires,TB383.1
  13. Hydrothermal Synthesis of Oxide Hollow Spheres,TB383.4
  14. Preparation and Electrocaloric Effect of BaxSr1-xTiO3 Ferroelectric Thin Films,TB383.2
  15. The Preparation and Research of Magnetically Separable TiO2 Photocatalyst Nanofibers,TB383.1
  16. Fire Retardancy Performance of Poly (Ethylene Terephthalate) Containing Melamine Cyanurate,TB383.1
  17. Investigation of Fabrication, Characterization and Property of Fuctional Titanium Dioxide Nanoporous Materials,TB383.1
  18. Investigation of Preparation and Properties of Ordered Porous TiO2,TB383.2
  19. Silica fume wet purified preparation of spherical nano-silica,TB383.1
  20. Study on Separation、 Preconcentration and Analysis of Trace Elements with Carbon Nanometer Materials,TB383.1
  21. Preparation of One-dimensional Nano TiO2 and Study on the Decolorization of Dyeing Wastewater,TB383.1
  22. Preparation, Characterization and Application of Prussian Blue Composite Nanomaterials,TB383.1

CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials
© 2012 www.DissertationTopic.Net  Mobile