A new approach of recognition of ellipsoidal micro- and nanoparticles on AFM images and determination of their sizes

Akhmadeev, A A; Салахов, М. Х.

doi:10.1088/0957-0233/27/10/105402

Cited by 9 publications

(6 citation statements)

References 39 publications

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“…The dielectrophoretic force and the Stokes force applied to the particles were obtained by solving the electric field and the flow field, respectively. The governing equations for F DEP are given in Equations ( 2)- (6). At the same time, the single-shell model was used for spore particles, and the governing equation was given by Equation (8).…”

Section: Numerical Simulation Methods and Boundary Conditionsmentioning

confidence: 99%

“…It is assumed that the speed of fluid flow is stable and the speed of microparticles is relatively small. Particles in a pressure drive flow experience a hydrodynamic drag force expressed as, st 6 ( )…”

Section: Theory and Working Principlementioning

confidence: 99%

“…At present, the detection methods of fungal spores mainly include image processing [6,7] , weighing method [8] , and polymerase chain reaction (PCR) [9,10] . However, due to the presence of a large amount of impurity, the above methods are limited in the detection of fungal spores.…”

Section: Introduction mentioning

confidence: 99%

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Separation-enrichment method for airborne disease spores based on microfluidic chip

Zhang

Yang

et al. 2021

International Journal of Agricultural and Biological Engineering

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Airborne diseases are likely to cause crop yield reduction, which has aroused widespread concern. In this study, a two-stage separation-enrichment structure microfluidic chip with a compound field for separation and enrichment of the greenhouse crops airborne disease spores directly from gas flow was developed. The chip is mainly composed of three parts: arc structure pretreatment channel, semicircular electrode structure and collection tank. COMSOL 5.1 software was used to simulate the designed microfluidic chip. 30 µm particles were used to represent P. xanthii spores, 25 µm particles were used to represent P. cubensis spores, and 16 µm particles were used to represent B. cinerea spores. The simulation results showed that the separation and enrichment efficiency of 16 μm particles, 25 μm particles, and 30 μm particles was 88%, 91%, and 94%, respectively. The experimental verification results were observed under a microscope. The results showed that the separation and enrichment efficiency of B. cinereal spores, P. cubensis spores and P. xanthii spores was 75.7%, 83.8% and 89.4%, respectively. As a result, the designed microfluidic chip can be used to separate and enrich the spores of airborne diseases of greenhouse crops, which can provide a basis for the research of real-time monitoring technology for greenhouse airborne diseases.

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Section: Numerical Simulation Methods and Boundary Conditionsmentioning

confidence: 99%

Section: Theory and Working Principlementioning

confidence: 99%

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Separation-enrichment method for airborne disease spores based on microfluidic chip

Zhang

Yang

et al. 2021

International Journal of Agricultural and Biological Engineering

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“…Static light scattering method, a non-contact, non-invasive method, requires a transparent medium (Fei, 2012). In recent years, atomic force microscopy and other new technologies have been applied to determine particle size and size distribution (Akhmadeev and Kh Salakhov, 2016), but they have not been widely applied due to high costs. Ultrasound is the preferred alternative in the industry because of its advantages ease-of-use, low cost and robust-to-media characteristics (Wu et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Application of artificial bee colony algorithm for particle size distribution measurement of suspended sediment based on focused ultrasonic sensor

Yeming

Yidan

Xie

et al. 2021

Transactions of the Institute of Measurement and Control

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A new focused ultrasonic sensor is proposed, based on which the measurement system for particle size distribution measurement of suspended sediment is established. Compared with the traditional ultrasonic sensors, the one used in this paper is equipped with piezoelectric transducer (PZT) on an arc-shaped shell, to concentrate ultrasonic beams on one measurement point. The sensor is used to measure the particle size distribution of suspended sediment. The experiments were carried out on water-sediment mixtures with different particle size distribution. Due to multiple parameters and non-linearity of the ultrasonic attenuation model, the artificial bee colony (ABC) inversion algorithm is used to estimate particle size distribution, thus improving measurement accuracy. The particle sizes obtained by sieving method are seen as reference values. The results indicate that whether the suspended particles are subject to a unimodal distribution, uniform distribution or random distribution, the particle size distribution obtained by ABC inversion algorithm is consistent with the result obtained by the sieve method. The results demonstrate that the method has good utility and accuracy within the low concentration range.

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“…This corresponds to the diameter of a sphere with the same projected surface as the studied nano-object. However, from this imaged NP surface area, other measurands such as minimum and maximum Feret diameters can be defined as well [5].…”

Section: Introductionmentioning

confidence: 99%

Development of a new hybrid approach combining AFM and SEM for the nanoparticle dimensional metrology

Crouzier¹,

Delvallée²,

Ducourtieux³

et al. 2019

Beilstein J. Nanotechnol.

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At this time, there is no instrument capable of measuring a nano-object along the three spatial dimensions with a controlled uncertainty. The combination of several instruments is thus necessary to metrologically characterize the dimensional properties of a nano-object. This paper proposes a new approach of hybrid metrology taking advantage of the complementary nature of atomic force microscopy (AFM) and scanning electron microscopy (SEM) techniques for measuring the main characteristic parameters of nanoparticle (NP) dimensions in 3D. The NP area equivalent, the minimal and the maximal Feret diameters are determined by SEM and the NP height is measured by AFM. In this context, a kind of new NP repositioning system consisting of a lithographed silicon substrate has been specifically developed. This device makes it possible to combine AFM and SEM size measurements performed exactly on the same set of NPs. In order to establish the proof-of-concept of this approach and assess the performance of both instruments, measurements were carried out on several samples of spherical silica NP populations ranging from 5 to 110 nm. The spherical nature of silica NPs imposes naturally the equality between their height and their lateral diameters. However, discrepancies between AFM and SEM measurements have been observed, showing significant deviation from sphericity as a function of the nanoparticle size.

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A new approach of recognition of ellipsoidal micro- and nanoparticles on AFM images and determination of their sizes

Cited by 9 publications

References 39 publications

Separation-enrichment method for airborne disease spores based on microfluidic chip

Separation-enrichment method for airborne disease spores based on microfluidic chip

Application of artificial bee colony algorithm for particle size distribution measurement of suspended sediment based on focused ultrasonic sensor

Development of a new hybrid approach combining AFM and SEM for the nanoparticle dimensional metrology

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