Taylor Cone–jet Mode in the Fabrication of Electrosprayed Microspheres

Vu, Viet Linh Nguyen

doi:10.15625/2525-2518/55/1b/12112

Cited by 4 publications

(4 citation statements)

References 7 publications

(7 reference statements)

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“…This observation is in agreement with the previous report [ 35 ]. Obtained homogeneous microsphere sizes and morphology, as well as uniform size, are necessary for many applications [ 14 , 36 ].…”

Section: Resultsmentioning

confidence: 99%

“…In this work, applied voltage and needle gauge were chosen as variable process parameters, while others were kept constant (as presented in Table 1 ). Several electrospray modes can be obtained during the electrospraying process based on the applied voltage (e.g., dripping, rapid dripping, unstable cone-jet, Taylor cone-jet, multi-jet and irregular unstable mode) [ 16 ], from which the most desirable is single Taylor cone-jet mode owing to its stability, reproducibility and production of small and monodisperse microspheres [ 36 , 37 ]. Stable Taylor cone-jet mode was formed at the voltages of 23 and 14 kV for CHT85-based and CHT95-based complex solutions, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Electrosprayed Chitosan–Copper Complex Microspheres with Uniform Size

2021

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Chitosan-based nano- and microspheres have shown great potential in a broad range of applications, including drug delivery, bone tissue engineering, wastewater treatments, etc. The preparation of uniformly sized spheres with controlled morphology and microstructure is still a challenge. This work investigates the influence of cupric ions (Cu2+) on the size, shape, morphology and stability of electrosprayed chitosan–copper (CHT–Cu2+) complex microspheres, using chitosans with different degrees of deacetylation. The dynamic viscosity of CHT–Cu2+ solutions was measured by Höppler viscometer, while attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) was used for the identification of dried microspheres. The size, shape and morphology of microspheres were analyzed by light microscope and scanning electron microscopy (SEM), while stability of dried microspheres was evaluated in different buffer solutions. The volume ratio of wet and dry microspheres was assessed based on the estimated diameter of microspheres. The higher concentration of Cu2+ ions resulted in a decrease in viscosity of CHT–Cu2+ solutions and volume ratio of prepared microspheres. Changes in the intensities and wave numbers of absorption bands of amino and hydroxyl groups, amide I and amide II suggested that the nitrogen and oxygen atoms in chitosan are coordinating the cupric ions. Micrographs obtained by light microscope and SEM showed that all prepared samples are spherical. The increase of cupric ions concentration changed the topography of microspheres and decreased their size. These results indicated the successful electrospraying of CHT–Cu2+ microspheres with uniform size and good stability in aqueous medium.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Electrosprayed Chitosan–Copper Complex Microspheres with Uniform Size

2021

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“…In this paper, 86 140 EHD spraying patterns data points are collected from 22 literature references − which cover working fluids that are widely used and reasonable wide ranges of the operating conditions. The detailed information can be found in the Supporting Information Table S1.…”

Section: Experimental Datamentioning

confidence: 99%

Machine Learning Assisted Spraying Pattern Recognition for Electrohydrodynamic Atomization System

Dong

Cheng

Yan

2022

Ind. Eng. Chem. Res.

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In this work, two machine learning (ML) models for recognizing electrohydrodynamic (EHD) spraying patterns are developed to guide the process operation to achieve stable cone-jet mode directly. To this end, the EHD spraying patterns are first divided into three categories, namely, dripping, stable cone-jet, and unstable cone-jet. A database consisting of 86 140 EHD spraying patterns data are used to build the recognition models. The artificial neural network (ANN) and support vector machine (SVM) models are trained through the collected data to give excellent performance in prediction of EHD spraying patterns. With the testing set data, the accuracy of the EHD spraying patterns recognition is 99.611% for the ANN model, and the result is 99.867% for the SVM model. The performance of these two models are further evaluated by comparing the recognition rates of the EHD spraying patterns with experimental data from 22 literature references, and the results show that the SVM model gives a better performance. Lastly, the SVM model is employed to predict the full picture of EHD spraying patterns. Four pattern maps are drawn with the assistance of the SVM model to reveal the effect of volumetric flow rate (Q), tip-to-collector distance (L), polymer concentration (C), nozzle inner diameter (D in), and applied voltage (V).

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“…When a high voltage is applied to the needle tip, the electric field will affect the surface tension of the solution droplet. Due to the influence of the electric charge on the needle tip on the solution, the solution is polarized and attracted towards the collector [23]. On the way from the tip of the needle to the collector, the solution undergoes thinning and evaporation of fibers or fibers that form and collect on the collector surface [21].…”

Section: Electrospinningmentioning

confidence: 99%

Fabrication of PVA/Carbon-Based Nanofibers Using Electrospinning

Yudoyono¹,

Anggoro²,

Ningsih³

et al. 2021

Nanofibers - Synthesis, Properties and Applications

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Nanofibers are widely used in various fields, including water filtration. In the development of nanofibers as water filtration, a mixture of carbon in a polymer solution is often used. Nanofibers can be made by several methods such as multicomponent fiber spinning techniques, melt blowing, electrospinning. Electrospinning is currently a simple development method but can produce nanofibers with a small fiber diameter, it is easy to develop and many parameters can be controlled. Parameters that affect the results of the nanofibers that are formed include flow rate or syringe pump flow rate and high voltage dc high voltage. Various types of nanofibers can be produced from various types of polymers, both natural polymers and synthetic polymers. Generally, because they have properties and characteristics such as high surface area, small pore size, and the possibility to be developed in various applications. Therefore, this chapter discusses the electrospinning of carbon nanofibers using PVA polymer.

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Taylor Cone–jet Mode in the Fabrication of Electrosprayed Microspheres

Cited by 4 publications

References 7 publications

Electrosprayed Chitosan–Copper Complex Microspheres with Uniform Size

Electrosprayed Chitosan–Copper Complex Microspheres with Uniform Size

Machine Learning Assisted Spraying Pattern Recognition for Electrohydrodynamic Atomization System

Fabrication of PVA/Carbon-Based Nanofibers Using Electrospinning

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