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N. S. Pshchelko
N. S. Pshchelko
Saint Petersburg State Mining Institute (Technical University)
Saint Petersburg State Mining Institute (Technical University)
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Articles

Geo-nanomaterials
  • Date submitted
    2016-10-05
  • Date published
    2016-02-01

Analysis of charge space distribution influence on electric adhesion forces

Modeling ideas of physical and chemical processes when using an anodic bonding for materials connection are developed. The kinetics of a charge accumulation in an electrode region in a dielectric is considered. The thickness of a charge layer, electric fields strength and value of the ponderomotive pressure providing connection of materials are calculated. It is shown that the necessary ponderomotive pressure resulting in a dielectric-to-conductor seal is normally about ten megapascal and the time required is about ten minutes. The appearance of great pulling electric fields at anodic bonding process with a conductor surface to dielectric turns out to be possible due to the interlayer polarization developing in dielectric under the action of electric voltage. This results in a negative charge accumulation in a layer of small thickness beside anode. Thus applied electric voltage is distributed not through the whole thickness of a dielectric, but in fact is applied to a narrow area of the three-dimensional charge be-side anode. Arising strong electric fields force the connected materials to unite. The physical and mathematical models for force characteristics of non-uniform electric field are developed. Dependences of parameters of anodic bonding junction on time are considered. The expressions allowing to choose well-founded time of formation of anodic bonding junction are obtained, intensity of electrostatic fields and forces in dynamics is calculated. Research of a charge intermittence influence on electrostatic field strength has shown a considerable differences on small distances to the charged surface between carried out and traditional ways of calculation.

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N. S. Pshchelko (2016) Analysis of charge space distribution influence on electric adhesion forces. Journal of Mining Institute. Vol 218. p. 296.
Humanities and fundamental researches
  • Date submitted
    2016-10-28
  • Date published
    2013-07-01

Use of electric fields for the control of metal-dielectric structures

In this work a device for measurement at a constant voltage of the basic electric characteristics of high-resistance dielectric materials and products from them – their electric capacitance and resistance – is developed. The principle of work of the device is based on use of transients in connected in sereies elements having electric capacity and resistance. In the electric circuit of the device the mosfet with high entrance resistance is used. Possibilities of practical use of the device for measurement of surface electret potential, for rejection of potentially unreliable condensers, for diagnostics of corrosion of metal under a pro-tective dielectric covering are considered, etc.

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N. S. Pshchelko, A. S. Poll', D. O. Repetukh (2013) Use of electric fields for the control of metal-dielectric structures. Journal of Mining Institute. Vol 206. p. 236.
Nanotechnologies and information technologies
  • Date submitted
    2016-11-22
  • Date published
    2012-02-01

The software for the control of capacitance structures parameters on the basis of electrostatic field power action use

The software for the procedure of definition of parameters of a cap of condenser structure with mobile facings on  the basis of use of power action  of an electrostatic field is considered. The offered technique allows on one operation of removal volt – capacitance characteristics to define the whole complex of the major parameters of a cap – size of a working air gap, a membrane deflection, electret surface potential and a membrane tension. The expressions for  capacity of a cap as a function of specified parameters are obtained. The software is developed for the technique use, allowing to define required parameters of a cap and to estimate their error. The procedure considered in the present work is a not destroying   monitoring.

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T. R. Akchurin, N. S. Pshchelko, V. V. Buevich (2012) The software for the control of capacitance structures parameters on the basis of electrostatic field power action use. Journal of Mining Institute. Vol 196. p. 289.
Nanotechnologies and information technologies
  • Date submitted
    2016-11-22
  • Date published
    2012-02-01

Diagnostics of potentially dangerous defects in dielectric materials

The paper presents a number of experimental techniques for detecting in amorphous tantalum oxide films structural defects, which accelerate film destruction processes in a strong electric field and thus are potentially dangerous under prolonged thermoelectric stresses applied to capacitor structures.  It is shown that the anomalous frequency dependence of dielectric losses and increase of the leakage current over time can identify potentially unreliable capacitors.

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E. K. Grigor'ev, N. S. Pshchelko (2012) Diagnostics of potentially dangerous defects in dielectric materials. Journal of Mining Institute. Vol 196. p. 311.
Nanotechnologies and information technologies
  • Date submitted
    2016-11-22
  • Date published
    2012-02-01

Use of power action of electric field for temporary and permanent connection of materials

Physical processes that lead to the emergence of large forces of attraction between bodies, joined by anodic bonding technology result from the large electric fields strengths at the contact interface. Nondestructive method of monitoring the strength of obtained conductor-to ionic dielectric anodic bonding seals is based on the relationship between the dependence of current versus time flowing in the formation of seals and the strength of  the  resulting seals. Theoretically justified a new technological method for nondestructive testing of  high-quality anodic bonding seals. The results obtained are confirmed experimentally.

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N. S. Pshchelko, A. S. Poll', D. O. Repetukh (2012) Use of power action of electric field for temporary and permanent connection of materials. Journal of Mining Institute. Vol 196. p. 356.
Nanotechnologies and information technologies
  • Date submitted
    2016-11-22
  • Date published
    2012-02-01

Discrete distributin of the electric charge influence on power characteristics of electric field in anodic bonding technologies

The physical and mathematical model allowing to estimate force and power characteristics  of non-uniform electric field in electroadhesive technologies is developed. The new processing method for making of qualitative conductive covering films on dielectric substrates with electrostatic field use is theoretically proved. The obtained results prove to be true experimentally.

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N. S. Pshchelko, N. P. Sidorova, D. A. Chigirev (2012) Discrete distributin of the electric charge influence on power characteristics of electric field in anodic bonding technologies. Journal of Mining Institute. Vol 196. p. 361.
Professionally oriented rhetoric: theory – practice – methodology of teaching (round table materials)
  • Date submitted
    2016-11-30
  • Date published
    2011-05-01

Influence of discretely distributed charge оn electric adhesion

The appearance of great pulling electric fields at anodic bonding process with a conductor surface to dielectric turns out to be possible due to the interlayer polarization developing in dielectric under the action of electric voltage. This results in a negative charge accumulation in a layer of small thickness beside anode. Thus applied electric voltage is distributed not through the whole thickness of a dielectric, but in fact is applied to a narrow area of the three-dimensional charge beside anode. Arising strong electric fields force the connected materials to unite. The physical and mathematical models for force characteristics of non-uniform electric field are developed. Research of a charge intermittence influence on intensity of an electrostatic field has shown a considerable differences on small distances to the charged surface between carried out and traditional ways of calculation. 

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N. S. Pshchelko (2011) Influence of discretely distributed charge оn electric adhesion. Journal of Mining Institute. Vol 193. p. 326.
Basic research in natural sciences
  • Date submitted
    2016-12-08
  • Date published
    2011-01-01

Non-destructive strength testing of anodic bonding conductor-to ionic dielectric seals

Physical processes that lead to the emergence of large forces of attraction between bodies, joined by anodic bonding technology result from the large electric fields strengths at the ontact interface. Nondestructive method of monitoring the strength of obtained conductor-to ionic di- electric anodic bonding seals is based on the relationship between the dependence of  current versus time flowing in the formation of seals and the strength of the resulting seals.  Theoreti cally justified a new technological method for manufacturing of  high-quality  anodic  bonding seals. The results obtained are confirmed experimentally.

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N. S. Pshchelko (2011) Non-destructive strength testing of anodic bonding conductor-to ionic dielectric seals. Journal of Mining Institute. Vol 189. p. 264.
Basic research in natural sciences
  • Date submitted
    2016-12-08
  • Date published
    2011-01-01

Electrical methods for nondestructive quality control of capacitors metal-oxide structures

The paper presents a number of experimental techniques for detecting in amorphous tantalum oxide films structural defects, which accelerate film destruction  processes in a strong electric field and  thus are potentially dangerous under prolonged thermoelectric stresses applied to capacitor structures. It is shown that the anomalous frequency dependence of dielectric losses and increase of the leakage current over time can identify potentially unreliable capacitors.

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N. S. Pshchelko, S. D. Khanin (2011) Electrical methods for nondestructive quality control of capacitors metal-oxide structures. Journal of Mining Institute. Vol 189. p. 268.
Applied and fundamental research in physics and mathematics
  • Date submitted
    2016-12-15
  • Date published
    2010-03-01

Procedure for determination of parameters of a condesing structures with a movable capacitor plates

Procedure for definition of parameters of a condenser structure cap is considered. The procedure allows by means of one operation – volt – capacitance characteristic measuring – to define the whole complex of the major parameters of a cap – size of a working air gap, a membrane deflection, surface electret potential and a membrane tension. The expressions for capacitance of a condenser structure cap as a function of specified parameters are obtained. Analytical expression for capacitance of a cap depending on the specified parameters and measuring of its volt-capacitance characteristic allow to define these parameters by solving corresponding system of equations. The procedure considered in the present work is a not-destroying quality monitoring method.

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N. S. Pshchelko (2010) Procedure for determination of parameters of a condesing structures with a movable capacitor plates. Journal of Mining Institute. Vol 187. p. 117.
Applied and fundamental research in physics and mathematics
  • Date submitted
    2016-12-15
  • Date published
    2010-03-01

Use of mosfet for the control of dielectric characteristics

In this work a device for measurement on a constant voltage of the basic electric characteristics of high-resistance dielectric materials and products from – their electric capacitance and resistance – is developed. The principle of work of the device is based on use of transients in connected in sereies elements having electric capacity and resistance. In the electric circuit of the device the MOSFET with high entrance resistance is used. The device on the basis of the MOSFET for measurement of surface potential of dielectrics is considered also. Use of this device is especially effective at measurement of electret surface potential. Results of research of electrets on a basis of silicon dioxide are discussed.

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N. S. Pshchelko, A. S. Mustafaev (2010) Use of mosfet for the control of dielectric characteristics. Journal of Mining Institute. Vol 187. p. 125.
Applied and fundamental research in physics and mathematics
  • Date submitted
    2016-12-15
  • Date published
    2010-03-01

Anodic bonding method for adhesion enhancement of conducting films to dielectric substrates

The appearance of great pulling electric fields at anodic bonding process with a conductor surface to ionic dielectric turns out to be possible due to the interlayer polarization developing in dielectric under the action of electric voltage. This results in a negative charge accumulation in a layer of small thickness beside anode. Thus applied electric voltage is distributed not through the whole thickness of a dielectric, but in fact is applied to a narrow area of the three-dimensional charge beside anode. Arising strong electric fields force the connected materials to unite. In the present work it is shown that use of the discussed technology allows to increase considerably adhesion of conducting films to dielectric substrates both in the process of their deposition and after it.

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A. G. Syrkov, N. S. Pshchelko (2010) Anodic bonding method for adhesion enhancement of conducting films to dielectric substrates. Journal of Mining Institute. Vol 187. p. 137.
Humanities and fundamental researches
  • Date submitted
    2016-12-20
  • Date published
    2010-02-01

Using of electric field for manufacturing and nondestructive testing of a capacitor sensors and actuators

Some designs of capacitor sensors and actuators which work is based on electric field use are considered. It is shown that these designs are rather cheap in manufacturing, but thus possess good technical characteristics. The theoretical substantiation of possibility of electrostatic forces use for balancing of a pressure difference in the corresponding measuring device is adduced. Procedure for definition of parameters of a condenser structure cap is considered. The procedure allows by means of one operation – volt-capacitance characteristic measuring – to define the whole complex of the major parameters of a cap-size of a working air gap, a membrane deflection, surface electret potential and a membrane tension. Analytical expression for capacitance of a cap depending on the specified parameters and measuring of its volt-capacitance characteristic allow to define these parameters by solving corresponding system of equations. The procedure considered in the present work is a method of a not-destroying control.

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N. S. Pshchelko, V. V. Buevich (2010) Using of electric field for manufacturing and nondestructive testing of a capacitor sensors and actuators. Journal of Mining Institute. Vol 186. p. 253.
Metallurgy and concentration
  • Date submitted
    2018-05-14
  • Date published
    2018-04-25

Use of nano-dimensional hydrophobic coatings for obtaining electrets based on silicon dioxide

The article considers the physical-technological foundations of formation of the silicon dioxide (SiO 2 ) based electret for use in devices of MEMS technology. Studies have shown that the best electret properties are in SiO 2 obtained in «wet» oxygen medium as compared to samples obtained by other oxidation methods. This is probably due to the large number of Si-OH groups on the surface of the oxide in the «wet» SiO 2 , which increases the effectiveness of the hydrophobic coatings during the modification of the SiO 2 surface. It has been found that other methods of obtaining oxide, for example, electrochemical or plasmachemical, do not make it possible to obtain SiO 2 with good electret properties. The decrease of the charge injected into an electret can occur due to the presence of volume or surface conductivity, as well as the screening of this charge by opposite charges from the medium, leading to significant decrease of electret surface potential at high ambient humidity. To increase the stability of the electret effect, it is necessary to perform water-repellency treatment of SiO 2 surface by applying thin (nanosized) water-repellent coatings. Experimental results on the stability of the electret surface potential are presented for usage of various water repellents. The most promising water repellents are high-temperature photoresist FPT-1-40 and polyimide nanolayer compositions – Langmuir-Blodgett films.

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N. S. Pshchelko (2018) Use of nano-dimensional hydrophobic coatings for obtaining electrets based on silicon dioxide. Journal of Mining Institute. Vol 230. p. 146. DOI: 10.25515/pmi.2018.2.146