Special solutions for magnetic separation problems using force and energy conditions for ferro-particles capture

Sandulyak, A. A.; Sandulyak, A. V.; Belgacem, Fethi Bin Muhammad; Kiselev, D. O.

doi:10.1016/j.jmmm.2015.10.108

Cited by 15 publications

(4 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Faraday's ponderomotive method is preferable in a case of statement of the problem about determining a sample' s magnetic susceptibility χ with a small volume V. Herewith it could be both solid and disperse sample (for example, powder sample of ferro-or ferromagnetic particles, which are disperse phase of many technological mediums, including those which are affected by magnetophoresis and magnetic control [1][2][3][4][5][6]). A magnetic (ponderomotive) force F, acting on study "microsample", becomes basic measurement value when magnetic loop of Faraday balance of field with intensity H (induction B = μ 0 H) and nonuniformity gradH (gradB) is creating between pole pieces.…”

Section: Introductionmentioning

confidence: 99%

Option of the Optical-mechanical Positioning of the Sensor and Sample in the Magnetometer. Determination of Magnetic Susceptibility of Powders and particles

Sandulyak¹,

Kiselev²,

Polismakova³

2018

ITM Web Conf.

Self Cite

View full text Add to dashboard Cite

In Faraday's magnetometer it is recommended to apply remotely the located poles hemispheres. In this case (and similar cases) there is a need for expeditious and exact positioning of the measuring sensor (Hall) and the studied samplefor obtaining the most authentic characteristics of induction and its gradient, identification and use of a zone of stability. This problem is solved by the corresponding opticalmechanical system of positioning. It consists of the laser modules promoting aim positioning, the Web camera promoting final positioning. On the received concentration dependences of magnetic susceptibility of powder samples existence of limited line sections is confirmed that gives the chance to define susceptibility of particles. The critical relation to use for the similar purposes of samples (disperse) in the form of colloids and suspensions expresses.

show abstract

Section: Introductionmentioning

confidence: 99%

Option of the Optical-mechanical Positioning of the Sensor and Sample in the Magnetometer. Determination of Magnetic Susceptibility of Powders and particles

Sandulyak¹,

Kiselev²,

Polismakova³

2018

ITM Web Conf.

Self Cite

View full text Add to dashboard Cite

show abstract

“…We are talking about the advancing applied scientific research in magnetophoresis and magnetic control of highly dispersed ferro-or ferrimagnetic particles (ferrofractions of many technological, natural and industry-specific media) [1][2][3][4][5][6], where one of the key issues is to obtain the data on the particles magnetic susceptibility. So, by the yielded (almost direct) results of the susceptibility of the sample represented by a conglomerate of the particles experimentally separated from some medium and necessary to realise the Faraday method, we can quite definitely estimate the susceptibility of single particles by dividing these data by the values of their packaging bulk density (under condition of their sufficient mutual separation).…”

Section: Introductionmentioning

confidence: 99%

The working zone in the interpolar area of the Faraday balance: an approach to testing the magnetic force factor stability criterion

et al. 2017

View full text Add to dashboard Cite

Abstract. Due to rapid development of the scientific and applied research in magnetic control and magnetophoresis of ferro-and ferromagnetic disperse fraction of various technological, natural and industry-specific media, the Faraday method is again in high demand as it is mainly aimed at defining magnetic susceptibility of solid and heterogeneous samples of small volumes. Based on the appearing (and then measured) ponderomotive force impacting the sample, the method allows accurate determining of single particles magnetic susceptibility by using the data of the sample represented by a conglomerate of the particles of such a fraction. In addition, it is mentioned that to date there is still a great gap in the methodology of the Faraday method as there are no exact recommendations on choosing both the form of the polar pieces of the Faraday balance and the positioning of the sample (the location of the working zone) in the interpolar area. Owing to these drawbacks, the well-known and long-time used Faraday method cannot be considered substantiated to a satisfactory degree. Thus, in our point of view, the treatment of the results obtained earlier with the help of the method should be cautious. In our work, we experimentally defined and substantiated an approach to identifying a working (local) zone, viz. the zone with stable values of the magnetic force factor -the product of the field intensity and induction by its gradient. The approach features the relative phenomenological analysis and is exemplified by polar pieces of non-traditional spherical form. It has been demonstrated that in order to state the fact of mere existence of this zone (and its location) in the interpolar area, the coordinate (usually nonlinear one) characteristic of intensity or induction, which is obligatorily obtained in an experiment, should have an inflexion, which guarantees a functionally extreme view of the following coordinate characteristics both of the gradient and that of the force factor. We also established the coordinates and the length of the working zone in a specific interpolar area.

show abstract

“…При этом в случае изучения ферро-или ферримагнитного образца получаемые данные измерений могут быть использованы, в частности, для нахождения магнитной восприимчивости собственно материала образца, отдельных частиц дисперсного образца-порошка. Последнее же особенно востребовано, например, для решения широкого круга задач магнитофореза и магнитоконтроля [1][2][3][4], когда для получения необходимых сведений о магнитных свойствах отдельных частиц и их материала достаточно использовать выделяемую из той или иной среды пробу малого объема в виде дисперсного образца.…”

Section: Introductionunclassified

Подход К Координации Малообъемного Образца При Реализации Пондеромоторного Метода Определения Его Магнитной Восприимчивости

Сандуляк¹,

Сандуляк²,

Polismakova³

et al. 2017

Российский технологический журнал

View full text Add to dashboard Cite

В настоящей работе рассматривается малоизученный вопрос идентификации рабочей зоны (зоны для координации исследуемых образцов малых объемов) в весах Фарадея по определению магнитной восприимчивости образцов пондеромоторным методом на основании специально получаемой координатной характеристики индукции поля между полюсными наконечниками указанных весов. Показано, что такая идентификация может быть вполне результативной в том случае, когда данная характеристика, обычно нелинейная и не поддающаяся желаемой, даже частичной, линейной аппроксимации, имеет перегиб. Тогда появляется возможность объективной линейной аппроксимации определенного участка этой характеристики, т.е. констатации стабильных значений градиента индукции в соответствии с принятым условием позиционирования образца. Становится также возможной иллюстрация экстремального вида характеристики градиента индукции; в окрестности экстремума значения градиента относительно стабильны. Ключевые слова: весы Фарадея, магнитная восприимчивость, зона размещения образца, характеристики напряженности (индукции), экстремум градиента.

show abstract

Special solutions for magnetic separation problems using force and energy conditions for ferro-particles capture

Cited by 15 publications

References 20 publications

Option of the Optical-mechanical Positioning of the Sensor and Sample in the Magnetometer. Determination of Magnetic Susceptibility of Powders and particles

Option of the Optical-mechanical Positioning of the Sensor and Sample in the Magnetometer. Determination of Magnetic Susceptibility of Powders and particles

The working zone in the interpolar area of the Faraday balance: an approach to testing the magnetic force factor stability criterion

Подход К Координации Малообъемного Образца При Реализации Пондеромоторного Метода Определения Его Магнитной Восприимчивости

Contact Info

Product

Resources

About