scholarly journals Preparation of Electrosprayed, Microporous Particle Filled Layers

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1352 ◽  
Author(s):  
Mohanapriya Venkataraman ◽  
Kai Yang ◽  
Xiaoman Xiong ◽  
Jiri Militky ◽  
Dana Kremenakova ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Electrical Properties ◽  
Polymer Solution ◽  
Shape Control ◽  
Hydrophobic Properties ◽  
Degree Of Ionization ◽  
Model Particle ◽  
Carbon Particles ◽  
Work Samples

Polytetrafluoroethylene (PTFE) is a synthetic fluoropolymer known for its excellent hydrophobic properties. In this work, samples from PTFE dispersions with different combinations of water and carbon microparticles were prepared using an electrospraying method. The morphologies and sizes of carbon particles were investigated and the properties of layers including roughness, hydrophobicity and electrical resistivity were investigated. The non-conductive carbon microparticles were selected as a model particle to check the compatibility and electrospraying ability, and it had no effect on the hydrophobic and electrical properties. Carbon microparticles in polymer solution increased the degree of ionization and was found to be beneficial for the shape control of materials. The results showed that PTFE dispersion with the composition of water and carbon microparticles produced fine sphere particles and the layer fabricated with increased roughness. It was also found that the electrical resistivity and hydrophobicity of all the layers comparatively increased. The fabricated microporous layers can be used in various applications like interlining layer in multilayer textile sandwiches.

scholarly journals Geoelectric method applied in correlation between physical characteristics and electrical properties of the soil

2017 ◽  
Vol 2 (2) ◽  
pp. 37 ◽  
Author(s):  
Antonio Marcelino Silva Filho ◽  
Carlos Leandro Borges Silva ◽  
Marco Antonio Assfalk Oliveira ◽  
Thyago Gumeratto Pires ◽  
Aylton José Alves ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Soil Moisture ◽  
Electrical Properties ◽  
Moisture Content ◽  
Soil Compaction ◽  
Clay Content ◽  
Physical Characteristics ◽  
Soil Dynamics ◽  
Different Types ◽  
The Relationship

This paper presents the study of the relationship between electrical properties and physical characteristics of the soil. Measures of apparent electrical resistivity of the soil were made for different types of soil, varying moisture content gradually while maintaining a constant compaction, and then varying the compaction and relating it to a constant humidity. Development of a correlation surface is proposed in order to identify granulometry of the soil from moisture and compaction measurements. For the study of spatial variability, two areas were chosen to allow the change of moisture content and compaction in order to verify the measurement capacity of apparent electrical resistivity of the soil as methodology to identify change in soil dynamics. Results obtained show correlations among apparent electrical resistivity of the soil, moisture, soil compaction and clay content.

Structural and Electrical Properties of Tin and Carbon Co-Implanted Silicon

1990 ◽  
Vol 201 ◽  
Author(s):  
P. Mei ◽  
M. T. Schmidt ◽  
P. W. Li ◽  
E. S. Yang ◽  
B. J. Wilkens
Keyword(s):  
Electrical Properties ◽  
Secondary Ion Mass Spectrometry ◽  
Alloy System ◽  
Group Iv ◽  
Carbon Ions ◽  
Depth Profiles ◽  
Structural And Electrical Properties ◽  
Group Iv Semiconductor ◽  
Work Samples ◽  
Secondary Ion

AbstractThe alloy system Six(SnyC1-y)1-x was investigated. In this work, samples were prepared by co-implantation of tin and carbon ions into silicon wafers with dosage range 1015 − 1016cm−2, followed by rapid thermal annealing. Rutherford backscattering channeling, Auger sputter profiling, and secondary ion mass spectrometry were employed to study the crystallinity, chemical composition and depth profiles. A near perfect crystallinity for 0.5% at. of tin and carbon was achieved. To study the electrical properties in the implanted materials, diode I-V measurements were performed. The data show near ideal p-n junctions in the co-implanted region. This work demonstrates promising features of group IV semiconductor synthesis by ion implantation.

Electrical Properties of Some Divalent Transition Cupferrone Complexes

1976 ◽  
Vol 31 (6) ◽  
pp. 675-676 ◽  
Author(s):  
H. F. Aly ◽  
F. M. Abdel-Kerim ◽  
H. H. Afifi
Keyword(s):  
Electrical Resistivity ◽  
Electrical Properties ◽  
Temperature Dependence ◽  
Uv Absorption ◽  
Cu And Zn

From the temperature dependence of the electrical resistivity of the divalent Mn, Co, Ni, Cu and Zn cupferrone complexes it is concluded that these compounds behave as semiconductors. It is also found that the charge transfere (CT) energy as calculated from the UV absorption CT bands is always larger than that drived from the electrical resistivity

Electrical Properties of Sb-Doped BaPbO3 Ceramics

2008 ◽  
Vol 368-372 ◽  
pp. 653-655
Author(s):  
Xin Wang ◽  
Yu Dong Lu ◽  
Zhi Qiang Zhuang
Keyword(s):  
Electrical Resistivity ◽  
Electrical Properties ◽  
Curie Temperature ◽  
Grain Boundaries ◽  
Solid Solubility ◽  
Defect Structure ◽  
Sol Gel ◽  
Charge Carriers ◽  
Donor Concentration ◽  
Main Factor

Sb-doped BaPbO3 ceramics were prepared by sol-gel method. The influence of Pb/Ba ratio and Sb concentration on the electrical properties of BaPb1+x-ySbyO3 (x=0.0, 0.1, 0.2 and 0≤y≤0.2) compositions were investigated. Holes and Pb vacancies were the major defects in lightly donor-doped BaPbO3, where the increase of donor concentration resulted in decrease of charge carriers (holes), leading to resistivity increasing. In the highly donor-doped conditions, the microstructure or solid solubility substituted defect structure as the main factor affecting the variety of resistivity. The lowest electrical resistivity of Sb-doped BaPbO3 was 2.69 × 10-4 /·cm when the Sb concentration y=0.12~0.13. Excess of Pb causes the born of barium vacancies. And, the observed PTCR behavior of BaPb1.2O3 involves the Barium vacancies in grain boundaries. 0.5 mol% Sb-doped BaPbO3 showed the best PTCR behavior and its Curie temperature was about 850°C.

Annealing Effects on Ta Doped SnO2 Films

2012 ◽  
Vol 1454 ◽  
pp. 245-251
Author(s):  
Junjun Jia ◽  
Yu Muto ◽  
Nobuto Oka ◽  
Yuzo Shigesato
Keyword(s):  
Electrical Resistivity ◽  
Electrical Properties ◽  
Beneficial Effect ◽  
Hall Mobility ◽  
Carrier Density ◽  
Annealing Temperature ◽  
Annealing Effect ◽  
Scattering Mechanism ◽  
Glass Substrates ◽  
Annealing Effects

ABSTRACTTa doped SnO2 (TTO) films prepared on quartz glass substrates at 200 °C were annealed in the air to investigate the annealing effect on the structural, the optical, and the electrical properties. It is shown that the annealing for TTO films resulted in beneficial effect on the electrical resistivity by improving the carrier density and Hall mobility. The lowest resistivity was 1.4 × 10-3Ω cm obtained at 400 °C annealing temperature. The scattering mechanism in TTO films was discussed from the optical and electrical perspectives. The variation in Hall mobility with increasing the annealing temperature may be attributed to the scattering from the ionized and neutral impurities in TTO films.

Experimental Research on the Conductive Property of MWCNT Nanopaper

2015 ◽  
Vol 727-728 ◽  
pp. 137-140
Author(s):  
A Ying Zhang
Keyword(s):  
Electrical Conductivity ◽  
Electrical Resistivity ◽  
Carbon Nanotube ◽  
Electrical Properties ◽  
The Self ◽  
Vacuum Deposition ◽  
Temperature Dependent ◽  
Polycarbonate Membrane ◽  
Multi Walled Carbon Nanotube ◽  
Conductive Property

This paper presents a systematic study of the nano-sized structure and temperature dependent electrical properties. A method of synthesizing the self-assembled multi-walled carbon nanotube (MWCNT) nanopaper on hydrophilic polycarbonate membrane was explored. The process is based on the very well-defined dispersion of nanotube and controlled pressure vacuum deposition procedure. The experiment results show that the ratio changes of MWCNT in the nanopaper could lead to the changes in the electrical conductivity efficiency of the nanopaper. Furthermore, the electrical resistivity of MWCNT nanopaper decreased as temperature increase.

Characterizing high-pressure compressed C60 whiskers and C60 powder

2003 ◽  
Vol 18 (1) ◽  
pp. 166-172 ◽  
Author(s):  
Kun'ichi Miyazawa ◽  
Minoru Akaishi ◽  
Yusuke Kuwasaki ◽  
Tadatomo Suga
Keyword(s):  
High Pressure ◽  
Electrical Resistivity ◽  
Electrical Properties ◽  
Vickers Hardness ◽  
High Density ◽  
X Ray Diffraction ◽  
X Ray ◽  
Density Of Dislocations ◽  
Mechanical And Electrical Properties

Structural, mechanical, and electrical properties were examined for C60 whiskers, high-pressure sintered C60 whiskers, and C60 powder. A high density of dislocations was observed in the C60 whiskers, and the C60 whiskers with diameters of a few hundred nanometers were found to be flexible. Although both the specimens sintered under the same condition showed similar surface x-ray diffraction profiles with a strong accumulation of [110]tr orientation, the sintered C60 whiskers showed a higher micro-Vickers hardness and an electrical resistivity four orders of magnitude lower than that of the sintered C60 powder.

Pitfalls in near-surface geophysical interpretation: Challenging paradigms and misconceptions

2018 ◽  
Vol 6 (4) ◽  
pp. SL1-SL9 ◽  
Author(s):  
David C. Nobes ◽  
Estella Atekwana
Keyword(s):  
Electrical Resistivity ◽  
Electrical Properties ◽  
Ground Penetrating Radar ◽  
Nonaqueous Phase Liquids ◽  
Potential Fields ◽  
Near Surface ◽  
Geophysical Interpretation ◽  
Occam’S Inversion ◽  
Ground Penetrating

Too often, ideas become so well-established that they take on the roles of paradigms, and challenging those paradigms can be difficult, even if they are flawed. Similarly, misconceptions can take root and become firmly entrenched and again are difficult to dislodge. Both of these situations are fundamentally unscientific. Science makes progress when established theories are shown to be incorrect or at least incomplete. To do that, we have to let the data that we collect tell their stories. We should not impose models upon the data, but rather allow the data to yield those models that best represent those features that are absolutely necessary to fit the data, an approach often called “Occam’s inversion.” We also should not impose nonphysical and unscientific limits on our interpretation models. We evaluate several examples from our own experiences: the electrical properties of faults, nonuniqueness in potential fields, the influence of nonaqueous phase liquids and water on ground-penetrating radar and electrical resistivity, and the geophysical response of seafloor mineralization. In each case, a reviewer or another scientist questioned the conclusions using unscientific or incorrect arguments or assumptions. We must let the data speak.

Calcium Modulates Interactions between Bacteria and Hydroxyapatite

2006 ◽  
Vol 85 (12) ◽  
pp. 1124-1128 ◽  
Author(s):  
S.C. Venegas ◽  
J.M. Palacios ◽  
M.C. Apella ◽  
P.J. Morando ◽  
M.A. Blesa
Keyword(s):  
Electrical Properties ◽  
Aqueous Medium ◽  
Surface Properties ◽  
Streptococcus Mutans ◽  
Electrophoretic Mobility ◽  
Bacterial Adhesion ◽  
Bacterial Strain ◽  
Lactobacillus Casei ◽  
Solid Surfaces ◽  
Hydrophobic Properties

Bacterial adhesion onto hydroxyapatite is known to depend on the surface properties of both the biomaterial and the bacterial strain, but less is known about the influence of the composition of the aqueous medium. Here, the adhesion of Streptococcus mutans and 3 different Lactobacilli on powdered hydroxyapatite was shown to change with Ca2+ concentration. The effect depends on the surface properties of each strain. Adhesion of Lactobacillus fermentum and salivarius (and of Streptococcus mutans at low Ca2+) was enhanced with increasing Ca2+ concentration. Lactobacillus casei was efficiently removed by adhesion on hydroxyapatite, even without Ca2+ addition, and the effect of this ion was only marginal. The results are interpreted in terms of Ca2+-mediated adhesion, and relative to the hydrophobic properties of each strain and the electrical properties of the bacterial and solid surfaces (electrophoretic mobility).

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