Optical extinction characteristics of three biofuel producing microalgae determined by an improved transmission method

Li, Xingcan; Zhao, Junming; Zhang, Lin

doi:10.1016/j.partic.2016.08.004

Cited by 10 publications

(7 citation statements)

References 29 publications

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“…Mie theory can be used to theoretically calculate the asymmetry factor of PA12 by inputting the refractive index of the material, 31 the surrounding medium of water, 32 and the particle size. In addition, previous studies have shown that independent scattering occurs at small particle volume fractions fv <0.006 12 . For all particle number concentrations considered in this study, the particle volume fraction is <0.006.…”

Section: Experimental Methodssupporting

confidence: 53%

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Thermal radiative properties of polyamide-12 from 0.2 to 1.1 μm

et al. 2023

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Microplastics are an emerging marine pollutant, and their negative impacts on the photosynthetic efficiency of marine photoautotrophs are gradually endangering marine ecosystems and biota. To analyze and solve the impact of microplastic particles on light propagation in the ocean, the investigation of radiative properties of microplastic particles is essential. The extinction and absorption coefficients of polyamide-12 (PA12) with different particle concentrations are experimentally measured using transmission and integration methods in the spectral range of 200 to 1100 nm. The extinction and absorption cross sections are obtained from the measured extinction and absorption coefficients. The measured PA12 absorption peaks, located at 692, 728, 764, 835, and 940 nm, correspond to the vibrational absorption of methylene groups (-CH 2 ) and amide groups (CO-NH). The scattering albedo of PA12 is mostly above 0.7 in the visible spectral, indicating that PA12 is a scattering dominated medium. The measured radiative properties of PA12 provide optical parameters for determining the radiative transfer containing microplastics.

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Section: Experimental Methodssupporting

confidence: 53%

“…9 A systematic overview of the radiative property measurement of particles has been conducted by Liu's group. [10][11][12][13] However, there is a lack of studies on the radiative properties of other microplastics.…”

Section: Introductionmentioning

confidence: 99%

Thermal radiative properties of polyamide-12 from 0.2 to 1.1 μm

et al. 2023

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“…Before the measurement, the microalgae suspensions was well mixed to ensure uniform distribution of the cells. The distance between detector and cuvette was 200 mm and the diameter of the detector was 2 mm, which was demonstrated to give enough accurate result for the extinction coefficient in our previous study [24,33]. Based on the measured normal-normal transmittance, the spectral extinction coefficient   was calculated from [1] , ,,…”

Section: Measurement Methods Of the Radiation Characteristicsmentioning

confidence: 99%

“…The radiative properties of microalgae are basic parameters for obtaining light field in PBRs. Radiative properties of many microalgae species at the VIS-NIR spectral range has already been experimentally determined [20][21][22][23][24]. Until recently, most reported radiative properties of microalgae were measured at the stationary growth phase, partly due to the difficulty in on-line measurement.…”

Section: Introductionmentioning

confidence: 99%

Temporal scaling of the growth dependent optical properties of microalgae

Zhao

Liu

2018

Journal of Quantitative Spectroscopy and Radiative Transfer

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The radiative properties of microalgae are basic parameters for analyzing light field distribution in photobioreactors (PBRs). With the growth of microalgae cell, their radiative properties will vary with growth time due to accumulation of pigment and lipid, cell division and metabolism. In this work, we report both experimental and theoretical evidence of temporal scaling behavior of the growth dependent radiative properties of microalgae cell suspensions. A new concept, the temporal scaling function (TSF), defined as the ratio of absorption or scattering cross-sections at growth phase to that at stationary phase, is introduced to characterize the temporal scaling. The temporal evolution and temporal scaling characteristics of the absoroption and scattering cross-sections of three example microalgae species, Chlorella vulgaris, Chlorella pyrenoidosa, and Chlorella protothecoides, were experimentally studied at spectral range 380 to 850 nm. It is shown that the TSFs of the absorption and scattering cross-sections for different microalgae species are approximately constant at different wavelength, which confirms theoretical predictions very well. With the aid of the temporal scaling relation, the radiative properties of microalgae at any growth time can be calculated based on those measured at stationary phase. The findings of this work will help the understanding of time dependent radiative properties of microalgae and facilitate their applications in light field analysis in PBRs design.

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“…In recent years, microalgae has gained attention as the most promising alternative source for energy production [1,2]. This is due to its higher growing rates than other crops (e.g.…”

Section: Introductionmentioning

confidence: 99%

Cell disruption and lipid extraction from microalgae Amphiprora sp. using acid hydrolysis-solvent extraction route

González-Delgado¹,

Martinez²,

Peralta-Ruiz³

2017

ces

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Growing global energy demand requires the development of novel alternatives for sustainable energy production and microalgae are being widely studied as an attractive source of biofuels and bioproducts. To obtain oil from microalgae biomass, pre-treatment methods are important for the product quality and production cost. In this work, lipids from microalgae Amphiprora sp. were obtained 842 Ángel Darío González-Delgado et al. using acid hydrolysis-solvent extraction route. The effect of hydrolysis and solvent extraction times on lipid extraction efficiency were evaluated in order to determine the most suitable conditions for performing both stages. In addition, morphological response of biomass after acid hydrolysis and liquid extraction was studied, as well as lipid and metabolites characterizations. The highest lipid efficiency (38.74%) was reached at 120 minutes of hydrolysis time and 16 hours of lipid extraction. The cell disruption was confirmed through the presence of remnants of cellular wall and cytoplasmic constituents and changes in colour of microalgae corresponded to alterations in cellular membrane caused by solvent extraction. The low percentage of saturated fatty acids (20.9 %) indicated that Amphiprora sp. is less suitable for biodiesel production in comparison with other genus widely studied for lipid extraction.

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Optical extinction characteristics of three biofuel producing microalgae determined by an improved transmission method

Cited by 10 publications

References 29 publications

Thermal radiative properties of polyamide-12 from 0.2 to 1.1 μm

Thermal radiative properties of polyamide-12 from 0.2 to 1.1 μm

Temporal scaling of the growth dependent optical properties of microalgae

Cell disruption and lipid extraction from microalgae Amphiprora sp. using acid hydrolysis-solvent extraction route

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