scholarly journals POSS Nanofiller-Induced Enhancement of the Thermomechanical Properties in a Fluoroelastomer Terpolymer

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1358 ◽  
Author(s):  
Daphné Berthier ◽  
Marie-Pierre Deffarges ◽  
Nicolas Berton ◽  
Mathieu Venin ◽  
Florian Lacroix ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Thermal Stability ◽  
Critical Role ◽  
Thermomechanical Properties ◽  
Polyhedral Oligomeric Silsesquioxanes ◽  
Microscopy Imaging ◽  
Composite Thin Films ◽  
Covalent Grafting ◽  
Dispersion State

The present study reports on the use of three types of polyhedral oligomeric silsesquioxanes (POSS) nanoparticles with various organic substituents as fillers in a fluoroelastomer (FKM). A series of/POSS elastomer composite thin films is prepared. Microstructural SEM/TEM (scanning electron microscopy/transmission electron microscopy) imaging reveals a dispersion state allowing the presence of micron-sized domains. The influence of POSS content is studied in order to optimize thermal stability and mechanical properties of the composite thin films. Both POSS-A (with an acryloyl functional group and seven isobutyl substituents) and POSS-P (with eight phenyl substituents) lead to higher thermal stability and modulus of the composites, with respect to the unfilled FKM terpolymer matrix. covalent grafting of POSS-A onto the FKM network is found to play a critical role. Enhanced storage modulus in the rubbery plateau region (+210% at 200 °C for 20 phr) suggests that POSS-A is particularly suitable for high temperature applications.

Multifunctional nano-engineered and bio-mimicking smart superhydrophobic reticulated ABS/fumed silica composite thin films with heat-sinking applications

RSC Advances ◽  
2016 ◽  
Vol 6 (107) ◽  
pp. 105180-105191 ◽  
Author(s):  
Prakash M. Gore ◽  
Susan Zachariah ◽  
Prashant Gupta ◽  
Balasubramanian K.
Keyword(s):  
Thin Films ◽  
Thermal Stability ◽  
Fumed Silica ◽  
High Thermal Stability ◽  
Composite Thin Films ◽  
Silica Composite ◽  
Engineered Surfaces ◽  
Self Cleaning ◽  
Heat Sinking

There are increasing requirements for engineered surfaces with distinct properties such as superhydrophobicity, self-cleaning, high thermal stability, and anti-corrosion.

A New Approach to the Synthesis of Carbon Nanotube-Polyhedral Oligomeric Silsesquioxane (POSS) Nanohybrids

2015 ◽  
Author(s):  
Seyed Morteza Sabet ◽  
Hassan Mahfuz ◽  
Andrew C. Terentis ◽  
Javad Hashemi
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Stability ◽  
Polyhedral Oligomeric Silsesquioxanes ◽  
Amide Bonds ◽  
Covalent Grafting ◽  
Multi Walled Carbon Nanotubes ◽  
Functionalization Of Carbon Nanotubes ◽  
Oligomeric Silsesquioxane ◽  
Walled Carbon Nanotubes

To date, the functionalization of carbon nanotubes (CNTs) with Polyhedral Oligomeric Silsesquioxanes (POSS) has become one of the most intensively explored methods to produce CNT-based nanostructure composite materials. In this study, a simple and effective synthesizing method has been reported to prepare a nanohybrid material consisting of multi-walled carbon nanotubes (MWCNT) and aminopropylisobutyl-POSS. The approach is based on covalent bonding between CNTs and POSS molecules. Characterization of the as-received materials as well as the POSS-treated CNTs has been performed. Raman and Fourier transform infrared spectroscopic analyses verify the covalent grafting of POSS onto CNT walls through the formation of amide bonds. TEM studies reveal the attachment of relatively high amount of POSS to the CNT walls in POSS-treated product. TGA observations suggest that the presence of relatively high amount of POSS in MWCNT-POSS product is responsible for the thermal stability of CNTs at temperature range of RT–200 °C. The resulting nanohybrids with improved functionality and thermal stability would be good candidates as reinforcing materials for compatible polymer matrices.

Electrical and Optical Properties of Gold-strontium Titanate Nano-composite Thin Films

2008 ◽  
Vol 1129 ◽  
Author(s):  
S Ganti ◽  
Y Dhopade ◽  
R K Gupta ◽  
K Ghosh ◽  
P K Kahol
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Strontium Titanate ◽  
Nano Particles ◽  
Nano Composite ◽  
Composite Thin Films ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Transmission Electron

AbstractThin films based on nano-composites have attracted considerable attention for their possible applications in devices and sensors. These nano-composite thin films are formed by embedding metal or semiconductor nano-particles in a host material and they exhibit interesting electrical transport properties. Using pulsed laser deposition technique, we have prepared nano-composite thin films of gold-strontium titanate on quartz substrate. Gold and strontium titanate were used as targets for pulsed laser deposition. Thin films having different compositions were grown. The effect of different composition on their electrical and optical properties has been studied in details. The structural characterizations of the films were done by x-ray diffraction, transmission electron microscopy, scanning electron microscopy, and atomic force microscopy. Transmission electron microscopy as well as atomic force microscopy shows the presence of gold nano-particles in these films. X-ray diffraction and energy dispersive x-ray spectroscopy shows the existence of strontium titanate and gold. Current-voltage characteristics and temperature dependent resistivity measurements were made to characterize electrical properties of these films. Electrical properties can be manipulated from metal to insulator through semiconductor by varying the composition. In addition, it is observed that the absorption of visible light increases with increase in gold percentage. This indicates that these nano-composites could also use as active materials for many electronic as well as optical sensors.

Direct Observation by Transmission Electron Microscopy of the Early Stages of Growth of Superconducting Thin Films

1989 ◽  
Vol 169 ◽  
Author(s):  
M. Grant Norton ◽  
Lisa A. Tietz ◽  
Scott R. Summerfelt ◽  
C. Barry Carter
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Transmission Electron Microscopy ◽  
Substrate Surface ◽  
Critical Role ◽  
Specimen Preparation ◽  
Superconducting Thin Films ◽  
Ion Milling ◽  
Early Stages ◽  
Transmission Electron

AbstractThe fabrication of high quality thin films often depends on the early stages of the growth process during which epitaxy is established. The substrate surface structure generally plays a critical role at this stage. Many observations of the high‐Tc superconductor film‐substrate interface structure and chemistry have been made by transmission electron microscopy (TEM) of cross‐section samples. Ion‐milling induced damage, however, can be severe in these specimens. In the present study, the early stages of the growth of high Tc superconducting thin films of YBa2Cu3O7δ have been studied by TEM using a technique which requires no post‐deposition specimen preparation.

Thermal Stability of Atomic Layer Deposited Zr:Al Mixed Oxide Thin Films: An in Situ Transmission Electron Microscopy Study

2005 ◽  
Vol 20 (7) ◽  
pp. 1741-1750
Author(s):  
L.C. Nistor ◽  
O. Richard ◽  
C. Zhao ◽  
H. Bender ◽  
G. Van Tendeloo
Keyword(s):  
Thin Film ◽  
Electron Microscopy ◽  
Thin Films ◽  
Thermal Stability ◽  
Transmission Electron Microscopy ◽  
Atomic Layer ◽  
Silicon Surfaces ◽  
Transmission Electron ◽  
Thermal Stability Of

The thermal stability of amorphous Zr:Al mixed oxide films of different composition, produced on (001) silicon wafers by the atomic layer deposition method is studied by transmission electron microscopy during in situ heating experiments. The temperatures at which phase separation and crystallization occur are composition dependent. The crystallization of thick films (55–70 nm), deposited on HF-treated silicon surfaces covered with a 15 cycles Al2O3 layer, results in the formation of cubic ZrO2 and cubic γ–Al2O3. In very thin films (5 nm), deposited on silicon surfaces covered with a 0.5 nm SiO2 thin film, the formation of tetragonal zirconium disilicide (ZrSi2) is observed in the microscope vacuum, at temperatures above 900 °C. This effect depends on the thickness of the as deposited thin film.

scholarly journals High Reliability and Fast-Speed Phase-Change Memory Based on Sb70Se30/SiO2 Multilayer Thin Films

2018 ◽  
Vol 2018 ◽  
pp. 1-6
Author(s):  
Dan Zhang ◽  
Yifeng Hu ◽  
Haipeng You ◽  
Xiaoqin Zhu ◽  
Yuemei Sun ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermal Stability ◽  
Phase Change ◽  
Crystallization Temperature ◽  
High Reliability ◽  
Rf Magnetron Sputtering ◽  
Multilayer Thin Films ◽  
Multilayer Composite ◽  
Data Retention ◽  
Composite Thin Films

Sb70Se30/SiO2 multilayer thin films were applied to improve the thermal stability by RF magnetron sputtering on SiO2/Si (100) substrates. The characteristics of Sb70Se30/SiO2 multilayer thin films were investigated in terms of crystallization temperature, ten years of data retention, and energy bandgap. It is observed that the crystallization temperature, 10-year data retention, and resistance of Sb70Se30/SiO2 multilayer composite thin films exhibited a higher value, suggesting that Sb70Se30/SiO2 multilayer composite thin films have superior thermal stability. The AFM measurement suggests that the SbSe (1 nm)/SiO (9 nm) multilayer thin films possess a smaller surface roughness (RMS = 0.23 nm). Besides, it was found that the phase-change time of SbSe (1 nm)/SiO (9 nm) multilayer thin films was shorter than that of GST in the process of crystallization and amorphization.

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