Continuous Wavelet Transform, a powerful alternative to Derivative Spectrophotometry in analysis of binary and ternary mixtures: A comparative study

Elzanfaly, Eman S.; Hassan, Said A.; Salem, Maissa Y.; El‐Zeany, Badr A.

doi:10.1016/j.saa.2015.06.100

Cited by 18 publications

(8 citation statements)

References 57 publications

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“…The dynamics of droplet formation in a second fluid inside microchannels have important applications in drug delivery (Richter et al, 1997), food industries (Cal, 2005), mixing in microfluidic multiphase systems (Losey et al, 2002), and a wide range of applications in biology and chemistry. Monodisperse droplets can be generated via different methods in microfluidic devices, including cross-junction devices Brazilian Journal of Chemical Engineering (Yasuno et al, 2004;Sugiura et al, 2004;Elzanfaly et al, 2015) , T-junctions (Cheng et al, 2016;Liu et al, 2015;Sbragaglia et al, 2016;Thorsen et al, 2001;Nisisako et al, 2002;Xu et al, 2006;Garstecki et al, 2006;Van der Graaf et al, 2006;Christopher et al, 2008;Azarmanesh and Farhadi, 2015;Malekzadeh and Roohi, 2015), flow-focusing devices (Anna et al, 2003;Cubaud et al, 2005;Garstecki et al, 2005;Fu et al, 2009) and co-flowing devices (Umbanhowar et al, 2000;Hua et al, 2007;Alizadeh et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Different Stages of Liquid Film Growth in a Microchannel: Two-Phase Lattice Boltzmann Study

Nazari

Sani

Kayhani

et al. 2018

Braz. J. Chem. Eng.

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A free energy model is used to describe the droplet formation and break-up process in a T-junction bio-microchannel. Droplets are created as a result of interaction of two immiscible liquids. Different stages for the droplet formation process are analyzed which are: a) growing in the x and y directions, b) growing in the x direction and c) detachment process. The effects of capillary number and flow rate ratio on the droplet formation stages are also studied. The influences of Capillary number, flow rate ratio, viscosity ratio and geometrical parameters on droplet break up, droplet size and detachment time are systematically studied. By increasing the flow rate ratio; the duration of droplet formation and the length of the x-growth stage are decreased for small capillary numbers. For larger capillary numbers; the droplet penetrates toward the downstream; therefore, the length of the x-growth stage is increased. The start of detachment process in the microchannel is also reported, which is related to narrowing of the neck of the liquid film. The results show that the detachment time is increased by decreasing the Capillary number. For Ca>0.02, the detachment time is independent of the flow rate ratios. Moreover; the effects of viscosity ratios on detachment time are not significant in comparison to the effects of capillary number. For Ca<0.04, the size of the droplet is independent of the viscosity ratio, but after the critical Capillary number (i.e., Ca=0.04), the size of the droplet is varied by the viscosity ratio. The time between two consecutive drops is also decreased by increasing the Capillary number. Moreover, this time is decreased by increasing the flow rate ratio until Ca=0.04. After this Capillary number, the flow rate ratios have no significant effect on the time between two consecutive droplets. An exhaustive validation study is performed including (a) the Laplace equation in the stationary droplet; (b) a contact angle test; (c) Taylor deformation test in shear flow and (d) comparison of the droplet length as a function of flow rate ratio between the present work and other studies.

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Section: Introductionmentioning

confidence: 99%

Different Stages of Liquid Film Growth in a Microchannel: Two-Phase Lattice Boltzmann Study

Nazari

Sani

Kayhani

et al. 2018

Braz. J. Chem. Eng.

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“…To maximize the separation of the peaks in a second derivative spectrum, the original spectra should be recorded at high resolution and using appropriate parameters [155]. Other methods used to calculate the derivative spectra include numerical differentiation [156] and continuous wavelet transform [157]. The latter has been proven to be efficient in the analysis of overlapping spectra and is advantageous for providing higher SNR and flexibility in searching for absorption peaks.…”

Section: Detection Methods: Derivative Spectroscopymentioning

confidence: 99%

Mid-Infrared Tunable Laser-Based Broadband Fingerprint Absorption Spectroscopy for Trace Gas Sensing: A Review

Zhang

et al. 2019

Applied Sciences

130

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The vast majority of gaseous chemical substances exhibit fundamental rovibrational absorption bands in the mid-infrared spectral region (2.5–25 μm), and the absorption of light by these fundamental bands provides a nearly universal means for their detection. A main feature of optical techniques is the non-intrusive in situ detection of trace gases. We reviewed primarily mid-infrared tunable laser-based broadband absorption spectroscopy for trace gas detection, focusing on 2008–2018. The scope of this paper is to discuss recent developments of system configuration, tunable lasers, detectors, broadband spectroscopic techniques, and their applications for sensitive, selective, and quantitative trace gas detection.

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“…Recently, the combined use of CWT and zero-crossing technique with a mathematical model for the resolution of multi-component overlapping signals has been formulated by Dinc and Baleanu 35,36 . Continuous Wavelet Transform (CWT) combined either with a zero-crossing technique 37,38 or ratio spectra 39 was used for simultaneous determination of chemical species in binary and ternary mixtures. For quantitation of multicomponent mixtures using CWT, calibration of each analyte in the mixture can be performed by modelling CWT-signal against concentration at zerocrosses of the other component.…”

Section: Continuous Wavelet Transformation (Cwt)mentioning

confidence: 99%

Efficient processing of Single and Multiple Spectral Variables for Resolution and Quantitation of Paracetamol, Chlorzoxazone and Diclofenac

Hegazy

Elshahed

Toubar

et al. 2018

Journal of Advanced Pharmacy Research

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Objectives: The main aim of this study is to apply smart, simple, rapid and accurate methods for simultaneous determination of Paracetamol (PAR), Chlorzoxazone (CXZ) and Diclofenac potassium (DIC), in their bulk powder and tablet dosage form. Methods: Potent processing methods were used which were based on the application of continuous wavelet transform (CWT) and Savitsky-Golay derivatization (SAVGOL) as univariate spectrophotometric methods, partial least squares (PLS) and synergy interval partial least squares (siPLS) as multivariate methods. Results: PAR, CXZ and DIC were determined in the concentration ranges of 2-30, 2-50 and 2-30 μg mL-1 , respectively. The regressing and validation parameters of the proposed methods revealed the efficiency of the methods. The results obtained for the analysis of those drugs by the proposed methods were statistically compared to those obtained by applying a reported high performance liquid chromatographic method. Statistical comparison was done, and no significant difference was found between the proposed methods and the reported one. Conclusion: Successful determination of ternary mixture containing PAR, CXZ and DIC was achieved with no need for tedious sample separation or pre-treatment derivatization which is considered a great benefit in quality control laboratories.

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Continuous Wavelet Transform, a powerful alternative to Derivative Spectrophotometry in analysis of binary and ternary mixtures: A comparative study

Cited by 18 publications

References 57 publications

Different Stages of Liquid Film Growth in a Microchannel: Two-Phase Lattice Boltzmann Study

Different Stages of Liquid Film Growth in a Microchannel: Two-Phase Lattice Boltzmann Study

Mid-Infrared Tunable Laser-Based Broadband Fingerprint Absorption Spectroscopy for Trace Gas Sensing: A Review

Efficient processing of Single and Multiple Spectral Variables for Resolution and Quantitation of Paracetamol, Chlorzoxazone and Diclofenac

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