Rheological Properties of PAN/DMF Spinning Solutions and Physical Properties of Conducting Carbon Nanofibers Prepared by Electrospinning and Carbonization

2016 ◽  
Vol 53 (5) ◽  
pp. 310-316
Author(s):  
Dong Wook Chae ◽  
Oh Joo Kwon ◽  
Eun Jeoung Lee ◽  
Byoung Chul Kim
Keyword(s):  
Physical Properties ◽  
Rheological Properties ◽  
Carbon Nanofibers

scholarly journals Improvement of Rheological Properties of Soil Structure Based on Lignite Dispersion

2019 ◽  
Vol 8 (11) ◽  
pp. 3700-3704
Keyword(s):  
Physical Properties ◽  
Rheological Properties ◽  
Relative Position ◽  
Time Variation ◽  
Soil Structure ◽  
Constant Strain Rate ◽  
Rheological Parameters ◽  
Stress And Strain ◽  
Relaxation Processes ◽  
Properties Of Soil

This article examines the change in stress and strain media, in particular natural leonardite (brown coal), prepared for grinding and during grinding, due to the restructuring of the material, i.e. changes in the relative position and deformation of the elements of the structure, including at the level of macromolecules that are inert to the deformation and relaxation processes, provide important for the technology to use improved rheological properties of the soil structure based on dispersion of leonardite, information about the physical properties of the material and its structure. The time variation of the stress in an inert-viscous-elastic medium with a constant strain rate depending on the values of the rheological parameters, it is possible to occur by three laws: aperiodic (steady), critical and oscillatory damp

scholarly journals Influence of plasma on the physical properties of ointments with quercetin

2017 ◽  
Vol 67 (4) ◽  
pp. 569-578
Author(s):  
Beata Szulc-Musioł ◽  
Barbara Dolińska ◽  
Justyna Kołodziejska ◽  
Florian Ryszka
Keyword(s):  
Shear Stress ◽  
Physical Properties ◽  
Rheological Properties ◽  
Rheological Parameters ◽  
Organoleptic Properties ◽  
Independent Variables ◽  
Newtonian Systems ◽  
Two Independent Variables

Abstract Effects of two independent variables - the content of quercetin (0 or 1 or 1.5 or 5 %) and the content of plasma (0 or 2 or 4 or 6 %) - on the organoleptic properties and rheological parameters of model formulations prepared on an amphiphilic base were estimated. The consistency of all ointments was uniform, and the content of quercetin and plasma lay within the predefined range. Tested ointments are non-Newtonian systems. The content of quercetin and plasma was found to have a significant effect on the rheological properties of the ointments. An increase in the content of plasma in ointments was accompanied by a significant increase in their hardness, viscosity and shear stress and a reduction of their spreadability. The best rheological properties were shown by formulation F-3, containing 1.5 % of quercetin and 2 % of plasma.

Effects of dispersion techniques of carbon nanofibers on the thermo-physical properties of epoxy nanocomposites

2008 ◽  
Vol 68 (13) ◽  
pp. 2722-2730 ◽  
Author(s):  
S.G. Prolongo ◽  
M. Burón ◽  
M.R. Gude ◽  
R. Chaos-Morán ◽  
M. Campo ◽  
...  
Keyword(s):  
Physical Properties ◽  
Carbon Nanofibers ◽  
Epoxy Nanocomposites ◽  
Thermo Physical Properties

Effect of Layered Double Hydroxides with Different Particle Size on Properties of Bitumen

2018 ◽  
Vol 913 ◽  
pp. 1062-1069
Author(s):  
Min Wu ◽  
Lian Li ◽  
Bian Yang He ◽  
Jian Ying Yu
Keyword(s):  
Particle Size ◽  
Physical Properties ◽  
Rheological Properties ◽  
Layered Double Hydroxides ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Uv Aging ◽  
Aging Resistance ◽  
Microscopic Morphology ◽  
Double Hydroxides

The crystal structure, microscopic morphology, particle size distribution and UV shielding properties of layered double hydroxides (LDHs) with different particle size were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), laser particle size analysis and ultraviolet and visible (UV-vis) spectrophotometer. The effects of LDHs with different particle size on the physical, rheological properties and UV aging resistance of bitumen were investigated by conventional physical properties and dynamic rheological characteristics. The results indicated that the particle size of LDHs had a little effect on the physical properties, and it had some influence on rheological properties of bitumen, but its influence on the UV aging resistance of bitumen was different significantly. When UV aging time was 9d, the viscosity aging indexes of bitumen modified by LDHs with different particle size (80nm, 115nm and 180nm) decreased by 48.2%, 58.1% and 63.8% compared with the pristine bitumen, respectively. LDHs with the particle size of 180 nm showed better improvement than other two kinds of LDHs on UV aging resistance of bitumen.

Preparation and Properties of a Novel Thermosetting Resin Based on 4,4'-Bismaleimidodiphenyl Methane and Allyl COPNA Resin

2012 ◽  
Vol 430-432 ◽  
pp. 24-27
Author(s):  
Lei Xiong ◽  
Qi Lang Lin
Keyword(s):  
Mechanical Properties ◽  
Dielectric Properties ◽  
Physical Properties ◽  
Rheological Properties ◽  
Thermosetting Resin ◽  
Resin System ◽  
Thermal Behaviors ◽  
Chemical Structures ◽  
Copna Resin ◽  
Thermo Stability

A bismaleimide (BMI) resin system based on allyl condensed polynuclear aromatic resin and 4,4'-bismaleimidodiphenyl methane was prepared in this paper. The chemical structures and rheological properties of the resin prepolymer were characterized by FTIR and viscometer, respectively. DSC was used to study the curing reaction of the resin prepolymer, and TG-DTG was employed to study the thermal behaviors of the cured resin. Moreover, physical properties of the BMI resin, including mechanical and dielectric properties, were studied. The results showed that the BMI resin had good thermo-stability, good mechanical properties and excellent dielectric properties. Introduction

A review of catalytically grown carbon nanofibers

1993 ◽  
Vol 8 (12) ◽  
pp. 3233-3250 ◽  
Author(s):  
N.M. Rodriguez
Keyword(s):  
Physical Properties ◽  
Carbon Nanofibers ◽  
Large Scale ◽  
Catalytic Decomposition ◽  
Metal Particles ◽  
Key Factors ◽  
Carbon Filaments ◽  
Careful Manipulation ◽  
Small Metal Particles ◽  
Made In

Carbon nanofibers (sometimes known as carbon filaments) can be produced in a relative large scale by the catalytic decomposition of certain hydrocarbons on small metal particles. The diameter of the nanofibers is governed by that of the catalyst particles responsible for their growth. By careful manipulation of various parameters it is possible to generate carbon nanofibers in assorted conformations and at the same time also control the degree of their crystalline order. This paper is a review of the recent advances made in the development of these nanostructures, with emphasis both on the fundamental aspects surrounding the growth of the material and a discussion of the key factors which enable one to control their chemical and physical properties. Attention is also given to some of the possible applications of the nanostructures which center around the unique blend of properties exhibited by the material.

scholarly journals LAYER CHARGE AND CHARGE DISTRIBUTION OF SMECTITES: A PARAMETER WHICH CONTROLS IMPORTANT PHYSICAL PROPERTIES OF BENTONITES

2007 ◽  
Vol 40 (2) ◽  
pp. 690
Author(s):  
G. E. Christidis
Keyword(s):  
Physical Properties ◽  
Rheological Properties ◽  
Charge Distribution ◽  
Classification Scheme ◽  
Lower Layer ◽  
Structural Formula ◽  
New Method ◽  
Layer Charge ◽  
Formula Method

The new method of Christidis and E beri (2003), which determines the layer charge and charge distribution of dioctahedral smectites in bentonites is presented and is compared to the existing methods for determination of layer charge and charge distribution, namely the structural formula method and the alkylammonium method. The new method is based on the comparison ofXRD traces of K-saturated, ethyleneglycol solvated smectites with simulated XRD-traces calculated for three-component interlayering. Applications of the method include modeling of the evolution of smectite layers towards illite during diagenesis, and study of the influence of layer charge and charge distribution of smectites on important physical properties of bentonites such as rheological properties (viscosity, gel strength, yield point and thixotropy) and swelling. Smectites with layer charge between -0.425 and-0.47 to - 0.48 equivalents phfu affect rheological properties in a different way compared to smectites with higher or lower layer charge than this layer charge interval. Based on these observations a new classification scheme for smectites has been proposed according to their layer charge. In this classification scheme the term smectites with intermediate layer charge has been introduced.

scholarly journals PENGARUH PENAMBAHAN GARAM NaCl PADA LUMPUR PEMBORAN BERBAGAI TEMPERATUR

PETRO ◽  
2018 ◽  
Vol 5 (2) ◽  
Author(s):  
Widia Yanti ◽  
Abdul Hamid ◽  
Ibnu Badar Bajri
Keyword(s):  
Physical Properties ◽  
Rheological Properties ◽  
Fresh Water ◽  
Solid Content ◽  
Drilling Mud ◽  
Electrical Stability ◽  
Mud Cake ◽  
Salt Addition ◽  
Oil Water ◽  
Water Ratio

<p>The unidealized of physical and rheological mud can occured when drilling on rock layers with high salt concentrations. It is therefore necessary to add an additive to balance the effect of the salt. The aims of this study is to see the effect of salt addition on various temperature drilling mud.</p><p>This research will use two types of mud with different oil-water ratio. The drilling mud will be divided into four compositions, ie LA, LB, LC, and LD. LA and LC compositions have an oil-water ratio of 80% oil and 20% fresh water. While LB and LD compositions have oil-water ratio of 75% oil and 25% fresh water. Then the study was conducted at various temperatures, ie 80 °F, 130 °F, 180 °F, 230 °F, 280 °F, and 330 °F. After observing of the physical properties and rheology of drilling mud, it was found that the effect of adding salt NaCl can improve the physical and rheological properties of mud such as density, viscosity, gel strengh, mud cake, and solid content. Conversely, the effect of adding NaCl salt may reduce the nature of electrical stability. While the increasing of the temperature can reduce the physical and rheological properties of mud and on the contrary the loss of water and mud cake will increase.</p>

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