Anomalous nano-barrier effects of ultrathin molybdenum disulfide nanosheets for improving the flame retardance of polymer nanocomposites

2015 ◽  
Vol 3 (27) ◽  
pp. 14307-14317 ◽  
Author(s):  
Dong Wang ◽  
Lei Song ◽  
Keqing Zhou ◽  
Xiaojuan Yu ◽  
Yuan Hu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Molybdenum Disulfide ◽  
Polymer Nanocomposites ◽  
Physical And Mechanical Properties ◽  
Flame Retardance ◽  
Barrier Effects ◽  
The Past ◽  
Molybdenum Disulfide Nanosheets

Polymer/graphene-analogous nanosheet composites have great potential for improving their physical and mechanical properties during the past few years.

scholarly journals Fifty years of progress in ice engineering

1987 ◽  
Vol 33 (S1) ◽  
pp. 78-85 ◽  
Author(s):  
Lorne W. Gold
Keyword(s):  
Mechanical Properties ◽  
Bearing Capacity ◽  
Thermal State ◽  
Physical And Mechanical Properties ◽  
Ice Formation ◽  
The Past ◽  
Atmospheric Icing ◽  
Ice Forces

AbstractThe literature reporting scientific and engineering investigations on ice has grown rapidly in the past 50 years, and increased by a factor of at least ten in the past 20 years. A review is presented of advances in engineering for ice problems during this period, including ice formation in rivers, lakes, and oceans; ice forces on structures; bearing capacity of ice covers; and atmospheric icing. The difficulties faced by engineers due to the unique physical and mechanical properties of ice and its normal thermal state are emphasized.

Characterization of the Mechanical Properties of Monolayer Molybdenum Disulfide Nanosheets Using First Principles

2013 ◽  
Vol 4 (3) ◽  
Author(s):  
R. Ansari ◽  
S. Malakpour ◽  
M. Faghihnasiri ◽  
S. Ajori
Keyword(s):  
Mechanical Properties ◽  
Molybdenum Disulfide ◽  
Poisson’S Ratio ◽  
Density Functional ◽  
Hexagonal Boron Nitride ◽  
Axial Strain ◽  
Poisson's Ratio ◽  
Generalized Gradient ◽  
Shear Moduli ◽  
Molybdenum Disulfide Nanosheets

Recently, synthesized inorganic two-dimensional monolayer nanostructures are very promising to be applied in electronic devices. This article explores the mechanical properties of a monolayer molybdenum disulfide (MoS2) including Young's bulk and shear moduli and Poisson's ratio by applying density functional theory (DFT) calculation based on the generalized gradient approximation (GGA). The results demonstrate that the elastic properties of MoS2 nanosheets are less than those of graphene and hexagonal boron-nitride (h-BN) nanosheets. However, their Poisson's ratio is found to be higher than that of graphene and h-BN nanosheet. It is also observed that due to the special structure of MoS2, the thickness of nanosheet changes when the axial strain is applied.

Characterization of Polyaniline Nanocomposite Using AC Electrochemical Impedance Spectroscopy

2006 ◽  
Author(s):  
Jianxun Hu ◽  
Dongyan Wang
Keyword(s):  
Mechanical Properties ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Polymer Nanocomposites ◽  
Electrochemical Impedance ◽  
Physical And Mechanical Properties ◽  
Octahedral Plane ◽  
Synthetic Mica ◽  
Polyaniline Nanocomposite

Silicate minerals have been found to improve physical and mechanical properties of polymers significantly through clay/polymer nanocomposites. This class of materials uses smectite-type clays, such as hectorite, montmorillonite, magadiite, and synthetic mica, as fillers to enhance the properties of polymers. One of the most important properties of smectite-type clays is their layered structure, in which each layer is constructed from tetrahedrally coordinated Si atoms fused into an edge-shared octahedral plane of either Al(OH)3 or Mg(OH)2. The layers exhibit excellent mechanical properties parallel to the layer direction due to the nature of the bonding between these atoms. It has been found that Young’s modulus in the layer direction is 50 to 400 times higher than that of a typical polymer [1–5]. The layers have a high aspect ratio and each one is approximately 1 nm thick, while the diameter may vary from 30 nm to several microns or larger. Hundreds or thousands of these layers are stacked together with weak van der Waals forces to form a clay particle. With such a configuration, it is possible to tailor clays into various different structures in polymer [1,6,7].

Developments in Lightweight Aluminum Alloys for Automotive Applications: 2001-2005

2006 ◽  
Keyword(s):  
Mechanical Properties ◽  
Fuel Efficiency ◽  
Physical And Mechanical Properties ◽  
Safety Performance ◽  
Automotive Application ◽  
Vehicle Safety ◽  
Automotive Applications ◽  
Lightweight Materials ◽  
The Past ◽  
Development Evaluation

The use of lightweight materials in automotive application has greatly increased in the past two decades. A need to meet customer demands for vehicle safety, performance and fuel efficiency has accelerated the development, evaluation and employment of new lightweight materials and processes. The 50 SAE Technical papers contained in this publication document the processes, guidelines, and physical and mechanical properties that can be applied to the selection and design of lightweight components for automotive applications. The book starts off with an introduction section containing two 1920 papers that examine the use of aluminum in automobiles.

A Review of Rubber Oxidation

2005 ◽  
Vol 78 (2) ◽  
pp. 355-390 ◽  
Author(s):  
Gui-Yang Li ◽  
J. L. Koenig
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Spatial Distribution ◽  
Oxidative Degradation ◽  
Physical And Mechanical Properties ◽  
Oxidation Products ◽  
Unique Combination ◽  
The Past ◽  
Diffusion Limited ◽  
Rubber Compounds

Abstract The aging of rubber caused by oxidative degradation leads to the deterioration in the physical and mechanical properties of vulcanized rubbers. In an effort to improve the oxidative stability of rubbers and elastomers, considerable amount of work has been carried out over the past 50 years (especially in the most recent 5 years) in order to understand degradation modes and effects in rubber due to the action of oxygen and ozone in the air. Different mechanisms have been proposed to interpret the experimental data relative to the oxidation of rubber. The diffusion limited theory has been widely used in the literature and verified by many experiments. Various instrumental techniques have been utilized to characterize the oxidation and degradation and their mechanisms in rubber compounds. Recently, FTIR imaging has demonstrated a unique combination of spectral and spatial resolution which allows not only the identification of the oxidation products but also their spatial distribution from the oxygen penetrating surfaces. This critical review will cover the major developments in our understanding of the oxidation of rubbers.

Lightweight Artificial Aggregate Based on Fly Ash for New Rehabilitation Materials

2013 ◽  
Vol 688 ◽  
pp. 146-151 ◽  
Author(s):  
Pavel Sokol ◽  
Rostislav Drochytka ◽  
Vit Cerný ◽  
Ester Helanová
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Power Plants ◽  
Raw Materials ◽  
Physical And Mechanical Properties ◽  
Social Pressure ◽  
High Quality ◽  
Lightweight Materials ◽  
The Past ◽  
Rehabilitation Work

During rehabilitation work are often strict requirements on the use of high quality lightweight materials, including aggregate. Due the constantly increasing social pressure on the optimal use of secondary raw materials is therefore most appropriate to exploit the potential of fly ash as mineral residue from the combustion of ground coal in power plants. Especially filter fly ash has proven to be an adequate substitute for traditional materials in the past. This article deals with the evaluation of physical and mechanical properties of cold-consolidated pellets based on conventional and fluidized fly ash with various cement addition.

scholarly journals MODEL ANALYSIS OF ELASTIC PROPERTIES OF COATING

2014 ◽  
Author(s):  
Sergiy Timofeyev
Keyword(s):  
Mechanical Properties ◽  
Molybdenum Disulfide ◽  
Composite Coating ◽  
Elastic Properties ◽  
Friction Surface ◽  
Deformation Theory ◽  
Physical And Mechanical Properties ◽  
Adequate Model ◽  
Elastoplastic Properties ◽  
Friction Surfaces

The article describes a method of solving the problem of designing the friction surfaces withcomposite coatings. Despite the fact that many scientists have investigated the effect of coatings on theproperties of the items during the exploitation, however, has not yet been carried out a detailed study ofelastoplastic properties of the coating to the copper-containing material with different concentrations ofultrafine additions of copper, nickel, molybdenum disulfide. Elastoplastic properties of such materials isusually described by the relations of the deformation theory of plasticity.It is proved that the modeling of physical and mechanical properties, and varying the coatingcomposition can achieve a favorable combination of properties of the surface and the substrate. Proposed ofdesigning friction surface with composite coating, development an adequate model of the interaction ofsurfaces, which makes it possible to judge which components need to enter into the coating to obtain thedesired properties.

A Review of Rubber Oxidation

2005 ◽  
Vol 78 (3) ◽  
pp. 355-390 ◽  
Author(s):  
Gui-Yang Li ◽  
J. L. Koenig
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Spatial Distribution ◽  
Oxidative Degradation ◽  
Physical And Mechanical Properties ◽  
Oxidation Products ◽  
Unique Combination ◽  
The Past ◽  
Diffusion Limited ◽  
Rubber Compounds

Abstract The aging of rubber caused by oxidative degradation leads to the deterioration in the physical and mechanical properties of vulcanized rubbers. In an effort to improve the oxidative stability of rubbers and elastomers, considerable amount of work has been carried out over the past 50 years (especially in the most recent 5 years) in order to understand degradation modes and effects in rubber due to the action of oxygen and ozone in the air. Different mechanisms have been proposed to interpret the experimental data relative to the oxidation of rubber. The diffusion limited theory has been widely used in the literature and verified by many experiments. Various instrumental techniques have been utilized to characterize the oxidation and degradation and their mechanisms in rubber compounds. Recently, FTIR imaging has demonstrated a unique combination of spectral and spatial resolution which allows not only the identification of the oxidation products but also their spatial distribution from the oxygen penetrating surfaces. This critical review will cover the major developments in our understanding of the oxidation of rubbers.

scholarly journals Determination and Review of Physical and Mechanical Properties of Raw and Treated Coconut Fibers for Their Recycling in Construction Materials

Fibers ◽  
2020 ◽  
Vol 8 (6) ◽  
pp. 37
Author(s):  
Huyen Bui ◽  
Nassim Sebaibi ◽  
Mohamed Boutouil ◽  
Daniel Levacher
Keyword(s):  
Mechanical Properties ◽  
Laboratory Tests ◽  
Natural Fibers ◽  
Construction Materials ◽  
Physical And Mechanical Properties ◽  
Coconut Fiber ◽  
Vegetable Fibers ◽  
Durability Properties ◽  
The Past ◽  
Coconut Fibers

In order to reduce the dependency on conventional materials and negative environmental impacts, one of the main responsibilities of the construction field is to find new eco-friendly resources to replace the traditional materials partially. Natural fibers were known as potential candidates for the reinforcement of structures in civil engineering by virtue of their advantages. Among the different kinds of vegetable fibers, coconut fiber has been exploited in a limited way over the past few years. This paper aims at evaluating the different properties of local coconut fibers (Vietnam). Several laboratory tests provide geometrical, physical, mechanical properties and durability properties that are compared with literature results obtained from similar natural fibers. The local coconut fibers tested demonstrated properties suitable for reinforced mortars. With adequate control of their preparation, they could be reused in the manufacture of mortars in the construction.

scholarly journals Physical and mechanical properties of polymer nanocomposites of penton - carbon nanotubes system

2020 ◽  
Vol 0 (57) ◽  
pp. 47-53
Author(s):  
М. І. Шут ◽  
М. О. Рокицький ◽  
Г. В. Рокицька ◽  
А. М. Шут ◽  
В. І. Баштовий ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Polymer Nanocomposites ◽  
Physical And Mechanical Properties
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