Nanoindentation hardness, Young’s modulus, and creep behavior of organic–inorganic silica-based sol-gel thin films on copper

2008 ◽  
Vol 23 (9) ◽  
pp. 2357-2365 ◽  
Author(s):  
Bruno A. Latella ◽  
Bee K. Gan ◽  
Christophe J. Barbé ◽  
David J. Cassidy
Keyword(s):  
Young’S Modulus ◽  
Creep Behavior ◽  
Young's Modulus ◽  
Sol Gel ◽  
Film Structure ◽  
Creep Properties ◽  
Organically Modified ◽  
Mechanical Models ◽  
Nanoindentation Hardness ◽  
Gel Processing

In this study, the mechanical properties and creep behavior of hybrid sol-gel silica-based coatings on copper substrates were investigated. Sol-gel processing was used to synthesize the organically modified silanes using mixtures of tetraethoxysilane and vinyltrimethoxysilane or glycidoxypropyltrimethoxysilane precursors. The mechanical and creep properties of the coatings were assessed using nanoindentation. The link between film structure and creep behavior from nanoindentation experiments was examined, and simple mechanical models were used to extract Young’s modulus and viscosity from fits to creep data. It is shown that the creep response of the coatings was influenced dramatically by the chain length and amount of organic substituent.

Indentation Creep and Adhesion of Hybrid Sol-Gel Coatings

2008 ◽  
Vol 41-42 ◽  
pp. 305-311 ◽  
Author(s):  
Bruno A. Latella
Keyword(s):  
Creep Behaviour ◽  
Sol Gel ◽  
Film Structure ◽  
Indentation Creep ◽  
Creep Properties ◽  
Creep Response ◽  
Microtensile Testing ◽  
Organically Modified

In this study the creep behaviour and adhesion characteristics of hybrid sol-gel silica-based coatings on copper substrates was examined. Sol-gel technology was used to synthesize the organically modified silanes using mixtures of tetraethoxysilane and glycidoxypropyltrimethoxysilane precursors. The creep properties and adhesion behaviour of the coatings were assessed using nanoindentation and microtensile testing, respectively. The link between film structure and creep behaviour was explored. It is shown that the creep response of the coatings is influenced dramatically by the introduction and quantity of the organic substituent.

Improvement in Mechanical Property of SiO2 Films Prepared by Sol-Gel

2013 ◽  
Vol 744 ◽  
pp. 269-272 ◽  
Author(s):  
Pei Tao Guo
Keyword(s):  
Mechanical Property ◽  
Thermal Treatment ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Sol Gel ◽  
Dimethyl Formamide ◽  
Good Mechanical Property ◽  
Chemical Additives ◽  
Sol Gel Process ◽  
Silica Sols

Silica films prepared by the base catalyzed sol–gel process show poor mechanical property. In this study, silica anti-reflective films with good mechanical property have been prepared by the catalyzed sol–gel process with dimethyl formamide added as drying control chemical additives. The silica sol was first dip deposited onto substrate to form films on both sides of the substrate and then subjected to thermal treatment. After thermal treatment, the film was achieved due to the formation of porous structure in the resultant film as a result of decomposing tetraethylorthosilicate and dimethyl formamide. Nano-indenter measurement shows that the Young’s modulus and hardness of base catalyzed films are 10-20GPa and 0.25-0.55GPa, respectively. But the films added with dimethyl formamide are much better than those films derived from base-catalyzed silica sols, the Young’s modulus and hardness are 32-39GPa and 1.22-1.47GPa, respectively. The good mechanical properties make such films potential in both military and civil applications.

scholarly journals Mechanical Characterisation of Polybutadiene-Cellulose Diacetate Composites

1995 ◽  
Vol 4 (3) ◽  
pp. 096369359500400
Author(s):  
G. Hernández ◽  
R. Rodríguez ◽  
A. Maciel ◽  
M.V. García-Garduño ◽  
V.M. Castaño
Keyword(s):  
Young’S Modulus ◽  
Mechanical Testing ◽  
Young's Modulus ◽  
Interfacial Bonding ◽  
Cellulose Diacetate ◽  
Chemically Modified ◽  
Mechanical Characterisation ◽  
Mechanical Models

Mechanical testing the behaviour of polybutadiene-cellulose diacetate (functionallized) was performed. The cellulose diacetate was chemically modified to improve the interfacial bonding between the components. The results indicate that the Young's modulus is increased substantially as the content of the functionallized component is increased. Finally, a comparison to theoretical mechanical models is shown.

Comparison of the Models to Predict the Effective Young's Modulus of Hybrid Composites Reinforced with Multi-Shape Inclusions

2013 ◽  
Vol 290 ◽  
pp. 15-20
Author(s):  
Dong Mei Luo ◽  
Hong Yang ◽  
Qiu Yan Chen ◽  
Ying Long Zhou
Keyword(s):  
Aspect Ratio ◽  
Young’S Modulus ◽  
Hybrid Composites ◽  
Young's Modulus ◽  
Controlling Factors ◽  
Isotropic Matrix ◽  
Mechanical Models ◽  
Multi Phase

In this paper, two kinds of micro-mechanical models are utilized to predict the effective Young's modulus for hybrid composites including fiber-like, spherical and needle inclusions in an isotropic matrix. The two models of Multi-Phase Mori-Tanaka Model (MP model) and Multi-Step Mori-Tanaka Model (MS model) are proposed by the authors in a series of interrelated research. The results show that the shape and the Young’s modulus of inclusion, aspect ratio of fiber-like inclusion are the controlling factors to influence the Young's modulus, and MP model is more rational to predict the effective Young’s modulus of hybrid composites reinforced with multi-shape inclusions.

Equivalent Young's modulus and thickness of graphene sheets for the continuum mechanical models

2014 ◽  
Vol 104 (22) ◽  
pp. 223101 ◽  
Author(s):  
Jin-Xing Shi ◽  
Toshiaki Natsuki ◽  
Xiao-Wen Lei ◽  
Qing-Qing Ni
Keyword(s):  
Young’S Modulus ◽  
Young's Modulus ◽  
Graphene Sheets ◽  
Mechanical Models ◽  
The Continuum

scholarly journals Mechanical, Structural and Biological Properties of Chitosan/Hydroxyapatite/Silica Composites for Bone Tissue Engineering

Molecules ◽  
2021 ◽  
Vol 26 (7) ◽  
pp. 1976
Author(s):  
Robert Adamski ◽  
Dorota Siuta
Keyword(s):  
Tissue Engineering ◽  
Compressive Strength ◽  
Young’S Modulus ◽  
Hybrid Composites ◽  
Young's Modulus ◽  
Sol Gel ◽  
Biological Properties ◽  
Yield Strain ◽  
Developed Surface ◽  
Bioactive Composites

The aim of this work was to fabricate novel bioactive composites based on chitosan and non-organic silica, reinforced with calcium β-glycerophosphate (Ca-GP), sodium β-glycerophosphate pentahydrate (Na-GP), and hydroxyapatite powder (HAp) in a range of concentrations using the sol–gel method. The effect of HAp, Na-GP, and Ca-GP contents on the mechanical properties, i.e., Young’s modulus, compressive strength, and yield strain, of hybrid composites was analyzed. The microstructure of the materials obtained was visualized by SEM. Moreover, the molecular interactions according to FTIR analysis and biocompatibility of composites obtained were examined. The CS/Si/HAp/Ca-GP developed from all composites analyzed was characterized by the well-developed surface of pores of two sizes: large ones of 100 μm and many smaller pores below 10 µm, the behavior of which positively influenced cell proliferation and growth, as well as compressive strength in a range of 0.3 to 10 MPa, Young’s modulus from 5.2 to 100 MPa, and volumetric shrinkage below 60%. This proved to be a promising composite for applications in tissue engineering, e.g., filling small bone defects.

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