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Microbalanza de cristal de cuarzo con medidas de disipación (QCM-D), aplicaciones en investigación y desarrollo de nuevos tipos de sensores

Resumen

Tipo:
Oferta Tecnológica
Referencia:
TOUA20141118001
Publicado:
10/12/2014
Caducidad:
10/12/2015
Resumen:
Un científico ucraniano ha desarrollado un modelo matemático de un resonador de cristal de cuarzo (QCR) para un nuevo método y técnica de microbalanza de cristal de cuarzo destinada a la investigación y desarrollo de nuevos tipos de sensores. Con este método es posible determinar las propiedades del material, como masa, elasticidad, viscosidad, etc. Se buscan socios con el fin de desarrollar, fabricar y utilizar equipos de medida basados en microbalanzas. Los acuerdos a alcanzar incluyen cooperación técnica o licencia.

Details

Tittle:
Method of quartz crystal microbalance with dissipation measurements (QCM-D), its application in research and the development of new types of sensors.
Summary:
Ukrainian scientist have developed a mathematical model of the quartz crystal resonator (QCR) that allows new method and technique of quartz crystal microbalance, intended for research and development of new types of sensors.
The method allows determining the material properties such as mass, elasticity, viscosity, and others. We are looking for the partners who develop, produce and use measuring equipment on the basis of microweighing. Possible sale of the license, technological support.
Description:
Quartz crystal microbalance method for determining the mass of the samples and the mass changes by external influences of various kinds. The mass of the sample should be in the range of 10 nanograms to 10 micrograms. The method allows to determine the physical parameters of the micro-objects and their changes, it is impossible to determine by any other means. This method also allows to define the thickness of the films on the surface of quartz crystal resonator in the range from 1 to 1000 nanometers.
However, when using the quartz crystal microbalance, the objects under study are not always rigidly attached to the surface of the quartz crystal resonator. In these cases, the well-known Sauerbrey equation, which is used for the calculation of the mass of the samples, do not provide a reliable data, as the proportional relationship between the frequency of quartz crystal resonator and the mass of the sample on its surface is broken.
The proposed method of investigation and methods of mathematical processing of the experimental data are intended to improve the method of quartz crystal microbalance.
The method is based on a new mathematical model quartz crystal resonator. The model includes a general equation of oscillations of solids and the individual parameters of the quartz crystal resonator. * Equation Sauerbrey is derived as a special case of the proposed mathematical model.
The proposed mathematical model allows to investigate cases where the sample:
1. Is an elastic body capable fluctuates relative to the surface of QCR. In this technique, besides weighting it allows to determine the elastic characteristics of the sample. For example, the experimental data containing the change in frequency and the quality factor of the quartz crystal resonator by melting bismuth, on its surface, calculated the coefficient of elasticity of liquid droplets of bismuth;
2. Is not rigidly attached to the quartz crystal resonator, and can move on its surface. In this case, the weighting method allows also to determine the degree of adhesion or the index of friction between the sample and the surface;
3. Located in a liquid medium or is itself a liquid. In this case, the technique allows to determine the viscosity of the liquid;
4. Exposed to external influences, such as magnetic or temperature fields or chemicals. In this case, the technique allows to calculate the weight of the mass of the samples and the weight of the mass change of the sample as a result of said external influence, and the characteristics of this action.
These calculations are performed by substituting the experimental data in the corresponding formulas of the mathematical model.
The method is implemented on the existing or slightly modernized laboratory equipment in the form of additional software for each of the application tasks.
In the proposed method, the parameters of quartz crystal resonator are selected in such a way as to ensure maximum reliability and information content of research results.
Mathematical model allows to explain the change in the frequency of quartz crystal resonator caused by external influences, and in those cases where the weight of the sample does not change, for example, under the influence of a magnetic field on a sample containing a ferromagnet. At that, mathematical model allows to predict the change in the parameters of the resonator during the change of the external impact.

The possibility of creating various types of sensors is based on it. For example, sensors that are utilized as a sensing elements of biological objects. The proposed method allows the identification of objects' structural changes, caused by outside factors. The time required for such identification does not exceed 1 millisecond.
Advantages and Innovations:
The present method allows for determination of the mass and the mass change of the sample in various kinds of external influences, for example, by chemical reaction, in those cases where the technique used at present, does not allow to obtain reliable information. These are cases where the sample:
1. Is not rigidly attached to the quartz crystal resonator, and can move on its surface. In this case, the weighting method allows also to determine the degree of adhesion or the index of friction between the sample and the surface;
2. Is an elastic body capable fluctuates relative to the surface of QCR. In this technique, besides weighting it allows to determine the elastic characteristics of the sample. For example, the experimental data containing the change in frequency and the quality factor of the quartz crystal resonator by melting bismuth, on its surface, calculated the coefficient of elasticity of liquid droplets of bismuth;
3. Located in a liquid medium or is itself a liquid. In this case, the technique allows to determine the viscosity of the liquid;
4. Exposed to external influences, such as magnetic or temperature fields or chemicals. In this case, the technique allows to calculate the weight of the mass of the samples and the weight of the mass change of the sample as a result of said external influence, and the characteristics of this action.
The above advantages of the method and techniques allow to apply them in the development of new types of sensors. For example, sensors utilizing sensing elements as biological objects. Also, the development of small-sized speed viscometer in which the measurement time is less than 1 second.
Stage of Development:
Prototype available for demonstration
IPs:
Secret Know-how
CommeR Statunts Regarding IPR Status:
Possibility to get an international patent.

Partner sought

Type and Role of Partner Sought:
-Industry. SMEs that develop and produce piezo-quartz equipment for scientific research.
-Requires technical cooperation for testing and adaptation to new applications.
-Funding of a joint project for the modification of manufactured equipment, project management.
-Research organizations (university, academy), which uses the method of quartz crystal microbalance.
-Funding of a joint research project, project management.

Client

Type and Size of Client:
Inventor
Already Engaged in Trans-National Cooperation:
No
Languages Spoken:
English

Keywords

Technology Keywords:
05005 Micro y nanotecnología
09001009 Tecnología de sensores relacionada con la realización de medidas