scholarly journals Anisotropic Surface Modification of Metal Oxide Nanoparticles

2014 ◽  
Vol 22 (0) ◽  
pp. 39-46
Author(s):  
Seiichi TAKAMI
Keyword(s):  
Surface Modification ◽  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Anisotropic Surface

The Development of Hemp Fibre Nonwovens

2015 ◽  
Vol 1117 ◽  
pp. 227-230
Author(s):  
Uljana Iljina ◽  
Ilze Baltina ◽  
Stephen Russell
Keyword(s):  
Surface Modification ◽  
Electrical Properties ◽  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Research Work ◽  
Oxide Nanoparticles ◽  
Hemp Fibre ◽  
Hemp Fibres

Hemp fibre nonwovens are developed in the research work with a goal to the materials surface modification applying metal and metal oxide nanoparticles. It is planned to investigate the electrical properties of nonwovens to determine their ability to serve as radiation insulation. Fibres cut into 5 cm long, some of them passed through Laroche Cadette equipment twice that opens the fibres and part manually combed before making nonwovens. Carded webs formed from prepared fibres by parallel-laid carding method. The fibres opened by using Laroche Cadette equipment formed web only by mixing hemp fibres with 15% Tencel fibres. Clean hemp fibres webs created from manually combed fibres. Hemp fibres nonwovens created by using hydroentanglement method.

Surface Modification Using Cubic Silsesquioxane Ligands. Facile Synthesis of Water-Soluble Metal Oxide Nanoparticles

2006 ◽  
Vol 18 (4) ◽  
pp. 956-959 ◽  
Author(s):  
Benjamin L. Frankamp ◽  
Nicholas O. Fischer ◽  
Rui Hong ◽  
Sudhanshu Srivastava ◽  
Vincent M. Rotello
Keyword(s):  
Surface Modification ◽  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Water Soluble ◽  
Oxide Nanoparticles ◽  
Facile Synthesis

High performance polymer/BaTiO3 nanocomposites based on surface-modified metal oxide nanoparticles using functional phosphonic acids for electronic applications

2008 ◽  
Vol 1113 ◽  
Author(s):  
Philseok Kim ◽  
Natalie M. Doss ◽  
John P. Tillotson ◽  
Xiao-Hong Zhang ◽  
Simon C. Jones ◽  
...  
Keyword(s):  
Thin Films ◽  
Surface Modification ◽  
Metal Oxide ◽  
Phosphonic Acid ◽  
Volume Fraction ◽  
Metal Oxide Nanoparticles ◽  
Dielectric Strength ◽  
Oxide Nanoparticles ◽  
High Quality ◽  
Nanocomposite Thin Films

ABSTRACTPolymer/ceramic nanocomposites provide a means of combining the high permittivities (εr) of metal oxide nanoparticles with the solution-processability and high dielectric strength of polymeric hosts. Simple mixing of nanoparticles and polymers generally results in poor quality nanocomposites due to the agglomeration of nanoparticles and poor miscibility of nanoparticles with host materials. We have shown that surface modification of metal oxide nanoparticles with phosphonic acid-based ligands affords robust surface modification and improves the processiblity and the quality of the resulting nanocomposites. We report on the use of phosphonic-acid modified barium titanate (BaTiO3, BT) nanoparticles in dielectric nanocomposites and their applications to high-energy-density capacitors and solution-processable high permittivity gate insulators in organic field-effect transistors (OFETs). Surface modification of BT nanoparticles enabled the formation of high quality nanocomposite thin films with ferroelectric polymer hosts such as poly(vinylidene fluoride-co-hexafluoropropylene), P(VDF-HFP), with large volume fractions (up to 50 vol. %), which are potentially useful materials for electrical energy storage. Similarly, the use of phosphonic acid-modified BT nanoparticles in cross-linked poly(4-vinylphenol) (PVP) allowed to form gate insulators for OFETs. High quality nanocomposite thin films at high nanoparticle volume fractions (up to 37 vol. %) with a large capacitance density (∼50 nF/cm2) and a low leakage current (10−8 A/cm2) were obtained. Pentacene-based p-type OFETs using these nanocomposites showed a large on/off current ratio (Ion/off 104 ∼ 106). We will also present the results from a recent experimental and theoretical study where the BT nanoparticle volume fraction was systematically varied in P(VDF-HFP) host, εr = 11, to find the optimum permittivity and dielectric strength, which provided a guideline for the optimization of the volume fraction for achieving maximum energy density.

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