Dukhin
Andrei Dukhin, Goldens Bridge, NY US
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20110012627 | Method for determining porosity with high frequency conductivity measurement - Propagation of ultrasound through a porous body saturated with liquid generates electric response. | 01-20-2011 |
Andrei Dukhin, Bedford Hills, NY US
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20110283800 | Method for determining porosity, pore size and zeta potential of porous bodies - Propagation of ultrasound through a porous body saturated with liquid generates electric response. This electro-acoustic effect is called “seismoelectric current”, whereas reverse version, when electric field is driving force, is “electroseismic current”. It is possible to measure seismoelectric current with existing electro-acoustic devices, which had been designed for characterizing liquid dispersions. Such versatility allows calibration of said devise using dispersion and then applying it for characterizing porous body. In general, magnitude of seismoelectric current depends on porosity, pore size, zeta potential of pore surfaces and elastic properties of matrix. It is possible to adjust conductivity of liquid for simplifying these dependences. For instance, liquid with high ionic strength causes double layers become thin comparing to the pore size, which eliminates dependence of said currents on pore size. We suggest using such case for characterizing porosity. Magnitude of the said currents is proportional to zeta potential. This parameter can be calculated when porosity is known. In contrary, saturation of porous body with low conducting liquid leads to complete overlap of double layers, which can be used for characterizing pore size. Phase of the said currents can be used for determining iso-electric point because it rotates 180 degrees when liquid composition varies through this point. | 11-24-2011 |
Andrei S. Dukhin, Goldens Bridge, NY US
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20130269442 | Method for Determining Pore Size and Pore Size Distribution of Porous Material Using Phase of Electro-Acoustic Signal - A method of determining pore size of a porous material. The method includes saturating the porous material with a conducting liquid. Measuring, with an electro-acoustic device, a phase of the seismo-electric or electro-seismic signal at a single frequency or multiple frequencies. Calculating an average pore size from the measured phase of the seismo-electric or electro-seismic signal at single frequency using a theory that takes into account the hydrodynamic relaxation of the conducting liquid inside of the pores of the porous material. Calculating pore size distribution from the similar measurement conducted at multiple frequencies using the same theory. | 10-17-2013 |
20150051864 | Device and Method for Determining Particle Size Distribution On-line Using Acoustic Spectroscopy Through a Pipe - A device for determining particle size distribution on-line for concentrated dispersions or emulsions. The device includes an electronic block for generating electric pulses of specified frequencies on MHz scale and measuring magnitude and phase thereof. An acoustic sensor has an ultrasound transmitter to convert the electric pulses into ultrasound pulses of a same frequency and an ultrasound receiver to convert the ultrasound pulses back into electric pulses. The transmitter and the receiver each have a respective face. A stepping motor is connected to a movable piston, which carries one of the ultrasound transmitter or the ultrasound receiver thereon. A pipe with a flexible wall to conduct the dispersion or emulsion past the acoustic sensor. The pipe is disposed between the transmitter and the receiver, and the pipe has an exterior surface. The face of the transmitter and the face of the receiver are affixed to the exterior surface of the pipe. | 02-19-2015 |
Stanislav Dukhin, Goldens Bridge, NY US
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20090293719 | FRACTAL STRUCTURED NANOAGGLOMERATES AS FILTER MEDIA - Systems and methods for achieving filtration are provided that utilize agglomerates or granules of nanoparticles. The agglomerates or granules of nanoparticles may be used as and/or incorporated into a HEPA filtration system to remove solid or liquid submicron-sized particles, e.g., MPPS, in an efficient and efficacious manner. The filtration systems and methods are provided that utilize agglomerates or granules in a size range of about 100-500 microns. The agglomerates or granules of nanoparticles exhibit a hierarchical fractal structure. In the case of agglomerates of nanoparticles, porosities of 0.9 or greater are generally employed, and for granules of nanoparticles, porosities that are smaller than 0.9 may be employed. Filter media formed from the agglomerates or granules may be formed from materials such as carbon black and fumed silica, and may be employed in baffled or non-baffled filtration apparatus. | 12-03-2009 |
Stanislav S. Dukhin, Goldens Bridge, NY US
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20100078046 | Apparatus and method for cleaning passageways such as endoscope channels using flow of liquid and gas - Apparatus and methods are disclosed for cleaning interiors of passageways in endoscopes or other luminal medical devices by flow of liquid and gas therethrough. The liquid flow may include rivulets, droplets or other liquid entities which move on the internal surfaces of the passageways, and may include a three-phase contact interface between liquid and dry solid and gas. | 04-01-2010 |
20100078047 | Method and composition for cleaning tubular systems employing moving three-phase contact lines - A method, composition and apparatus for cleaning an internal surface of a narrow diameter channel. The method includes: | 04-01-2010 |
20110300202 | Medical item for long term durg release - Polymeric articles capable of releasing drugs at therapeutic levels over extended periods of time, and methods for producing the extended release articles. | 12-08-2011 |
20120234357 | METHOD FOR COMPOSITION FOR CLEANING TUBULAR SYSTEMS EMPLOYING MOVING THREE-PHASE LINES - A method for cleaning an internal surface of a narrow diameter channel includes steps of flowing a liquid cleaning medium and a gas through the narrow diameter channel under a flow regime that creates surface flow entities in contact with and sliding along the internal surface of the narrow diameter channel, said surface flow entities having three-phase contact lines and associated menisci, said surface flow entities detaching contaminants with which they come in contact from the internal surface of the narrow diameter internal surface of the narrow diameter channel; and rinsing the internal surface of the narrow diameter channel to remove residual liquid cleaning medium and detached contaminants from the channel. | 09-20-2012 |
20120285488 | Apparatus and method for cleaning passageways such as endoscope channels using flow of liquid and gas - Apparatus and methods are disclosed for cleaning interiors of passageways in endoscopes or other luminal medical devices by flow of liquid and gas therethrough. The liquid flow may include rivulets, droplets or other liquid entities which move on the internal surfaces of the passageways, and may include a three-phase contact interface between liquid and dry solid and gas. | 11-15-2012 |