3D monitoring of the surface slippage effect on micro-particle sedimentation by digital holographic microscopy

Panahi, Majid; Jamali, Ramin; Rad, Vahideh Farzam; Khorasani, Mojtaba; Darudi, Ahmad; Moradi, Ali‐Reza

doi:10.1038/s41598-021-92498-0

Cited by 13 publications

(4 citation statements)

References 65 publications

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“…Among these techniques are pressure drop versus flow rate, hydrodynamic drainage forces between two surfaces (surface force apparatus [34][35][36][37] and colloid probe atomic force microscopy [38][39][40] ), shear stress measurement (typically using a rheometer) [41,42] and sedimentation of particles. [43,44] With the exception of the hydrodynamic drainage force measurements, these techniques normally require simpler experimental setups in comparison with direct methods. As a result, they have been used extensively to evaluate the slip performance of a wide range of surfaces.…”

Section: Techniques For Quantifying Fluid Slipmentioning

confidence: 99%

Pressure Drop Measurements in Microfluidic Devices: A Review on the Accurate Quantification of Interfacial Slip

Vega‐Sánchez

Neto

2021

Adv Materials Inter

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The correct theoretical definition of boundary conditions of flow underpins all fluid dynamics studies, and is particularly important in situations in which the flow is confined on the nano‐ and micro‐scale. Microfluidic devices are an excellent platform to measure boundary flow conditions, and the pressure drop versus flow rate method is particularly useful in detecting evidence of microscale interfacial slip and drag reduction. This review focuses on the pressure drop method, identifying the main experimental parameters affecting the accuracy and reproducibility of microfluidic experiments of slip, quantifying the magnitude and source of common errors, and providing practical solutions and guidelines. A summary of literature results of interfacial slip obtained with pressure drop measurements in microfluidic devices is also provided, and the slip results are directly compared to expected slip models. This review serves as an introduction for new researchers moving into the field of interfacial slip, and as reminder for established researchers of the need to create highly controlled experimental procedures in order to obtain reproducible and reliable measurements of boundary flow conditions. A direct comparison of accurate experiments with theoretical models is bound to bring about clarity about the mechanisms of slip on smooth and structured surfaces.

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Section: Techniques For Quantifying Fluid Slipmentioning

confidence: 99%

Pressure Drop Measurements in Microfluidic Devices: A Review on the Accurate Quantification of Interfacial Slip

Vega‐Sánchez

Neto

2021

Adv Materials Inter

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“…The high resolution of displacement at the nanometer scale is a challenging but significant endeavor. Digital holographic microscopy (DHM), which is not a scanning-based method [10], has a nanometer resolution [11]; therefore, it is an approach applicable to dynamic phenomena, including those in microfluidics. Commercial holographic particle characterization instruments (Spheryx, Inc., xSight, New York, NY, USA) yield the microsphere's in-plane displacement to within a nanometer and its axial position to within 5 nm [12].…”

Section: Introductionmentioning

confidence: 99%

Improving the Signal-to-Noise Ratio of Axial Displacement Measurements of Microspheres Based on Compound Digital Holography Microscopy Combined with the Reconstruction Centering Method

Zeng,

Guo,

et al. 2024

Sensors

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In 3D microsphere tracking, unlike in-plane motion that can be measured directly by a microscope, axial displacements are resolved by optical interference or a diffraction model. As a result, the axial results are affected by the environmental noise. The immunity to environmental noise increases with measurement accuracy and the signal-to-noise ratio (SNR). In compound digital holography microscopy (CDHM)-based measurements, precise identification of the tracking marker is critical to ensuring measurement precision. The reconstruction centering method (RCM) was proposed to suppress the drawbacks caused by installation errors and, at the same time, improve the correct identification of the tracking marker. The reconstructed center is considered to be the center of the microsphere, rather than the center of imaging in conventional digital holographic microscopy. This method was verified by simulation of rays tracing through microspheres and axial moving experiments. The axial displacements of silica microspheres with diameters of 5 μm and 10 μm were tested by CDHM in combination with the RCM. As a result, the SNR of the proposed method was improved by around 30%. In addition, the method was successfully applied to axial displacement measurements of overlapped microspheres with a resolution of 2 nm.

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“…DHM is a noncontact, nondestructive and nonscanning technique for quantitative phase imaging, therefore, suitable for retrieving the morphology of biological samples and surface topography of reflective ones. 42 We have already applied DHM for 3D visualisation of myelin figures and their dynamics under thermal gradients, 43 changes in their environmental humidity, 44 studying microstructural surface characterisation, 45 evaluation of intergranular corrosion of stainless steel, 46,47 microparticle sedimentation, 48 and 3D characterisation of nanocomposites. 39,49 In DHM, phase information of an object is preserved through recording the interference between a laser beam passing through the object, so-called object beam and a beam from the same laser source, so-called reference beam, on a digital sensor.…”

Section: Introductionmentioning

confidence: 99%

Digital holographic microscopy of spiropyran‐based dynamic materials

Jamali,

Rad,

Razaghi

et al. 2023

Journal of Microscopy

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Spiropyran (SP)‐based dynamic materials undergo structural changes in response to external stimuli. In this paper, we show that digital holographic microscopy (DHM) is an effective candidate for characterisation of SPs (embedded in polymer matrices) and for monitoring of their dynamical changes. The polymer matrices are polylactic acid (PLA) and poly(methyl methacrylate) (PMMA) films, which are decorated with SPs and immobilised on graphene quantum dots (GQDs). GQDs are modified by benzylamines prior to the loading of SP species because of the enhancement of hydrophobic characteristics. UV irradiation is used as the external stimulus and the dynamical changes of the samples before and after UV irradiation are measured. DHM is arranged on a novel self‐referencing setup, which substantially reduces the sensitivity of DHM to environmental vibrations. Morphometric information for characterisation of the samples is obtained by analysis of the recorded digital holograms. The experimental results demonstrate the potential of the presented technique to serve as an alternative technique for surface measurement methodologies such as atomic force microscope and stylus profiler for surface characterisation of similar materials.

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3D monitoring of the surface slippage effect on micro-particle sedimentation by digital holographic microscopy

Cited by 13 publications

References 65 publications

Pressure Drop Measurements in Microfluidic Devices: A Review on the Accurate Quantification of Interfacial Slip

Pressure Drop Measurements in Microfluidic Devices: A Review on the Accurate Quantification of Interfacial Slip

Improving the Signal-to-Noise Ratio of Axial Displacement Measurements of Microspheres Based on Compound Digital Holography Microscopy Combined with the Reconstruction Centering Method

Digital holographic microscopy of spiropyran‐based dynamic materials

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