Size, Shape, and Wavelength Effect on Photothermal Heat Elevation of Gold Nanoparticles: Absorption Coefficient Experimental Measurement

2020 ◽  
Vol 37 (12) ◽  
pp. 2000255
Author(s):  
Amadou Thierno Diallo ◽  
Malika Tlemçani ◽  
Memona Khan ◽  
Jolanda Spadavecchia ◽  
Nadia Djaker
Keyword(s):  
Gold Nanoparticles ◽  
Absorption Coefficient ◽  
Experimental Measurement

THEORETICAL MODEL FOR THE CALCULATION OF OPTICAL PROPERTIES OF GOLD NANOPARTICLES

2010 ◽  
Vol 19 (03) ◽  
pp. 427-436
Author(s):  
A. MENDOZA-GARCÍA ◽  
A. ROMERO-DEPABLOS ◽  
M. A. ORTEGA ◽  
J. L. PAZ ◽  
L. ECHEVARRÍA
Keyword(s):  
Gold Nanoparticles ◽  
Refractive Index ◽  
Optical Properties ◽  
Theoretical Model ◽  
Absorption Coefficient ◽  
Molecular System ◽  
Two Dimensional ◽  
Box Models ◽  
Solvent Environment ◽  
Absorption And Dispersion

We have developed an analytical method to describe the optical properties of nanoparticles, whose results are in agreement with the observed experimental behavior according to the size of the nanoparticle under analysis. Our considerations to describe plasmonic absorption and dispersion are based on the combination of the two-level molecular system and the two-dimensional quantum box models. Employing the optical stochastic Bloch equations, we have determined the system's coherence, from which we have calculated expressions for the absorption coefficient and refractive index. The innovation of this methodology is that it allows us to take into account the solvent environment, which induce quantum effects not considered by classical treatments.

scholarly journals Experimental Measurement of Weak Band Intensities

1994 ◽  
Vol 146 ◽  
pp. 366-375
Author(s):  
Kevin K. Lehmann ◽  
Daniele Romanini
Keyword(s):  
Absorption Coefficient ◽  
Ab Initio ◽  
Oscillator Strength ◽  
Experimental Measurement ◽  
Laboratory Data ◽  
Stellar Atmospheres ◽  
Theoretical Treatment ◽  
Weak Band ◽  
Triatomic Molecules ◽  
Experimental Challenge

In modeling the opacity of astronomical objects, such as stellar atmospheres, the most important transitions are those with absorbance =αL∼ 1, whereαis the absorption coefficient of the atmosphere and L is the pathlength that light travels in leaving the atmosphere. Transitions with much smaller absorbance are not important, while those with much larger absorbance are effectively opaque. The relevant absorption lengthsLare typically orders of magnitude larger than can be realized in the laboratory, and thus obtaining the needed laboratory data is a significant experimental challenge. This volume contains several examples of the power of modernab initiomethods to predict spectra of simple triatomic molecules, such as H2O, but it is still necessary to at least calibrate the predictions against laboratory bands of similar oscillator strength. The theoretical treatment of molecules with four or more atoms lags far behind the theoretical treatment of triatomics and present experimental capabilities.

Is there a “universal” MAC equation?

1990 ◽  
Vol 48 (2) ◽  
pp. 228-229
Author(s):  
Robert E. Ogilvie
Keyword(s):  
Absorption Coefficient ◽  
Atomic Absorption ◽  
Atomic Number ◽  
X Ray ◽  
Time Period ◽  
Image Position

The search for an empirical absorption equation begins with the work of Siegbahn (1) in 1914. At that time Siegbahn showed that the value of (μ/ρ) for a given element could be expressed as a function of the wavelength (λ) of the x-ray photon by the following equationwhere C is a constant for a given material, which will have sudden jumps in value at critial absorption limits. Siegbahn found that n varied from 2.66 to 2.71 for various solids, and from 2.66 to 2.94 for various gases.Bragg and Pierce (2) , at this same time period, showed that their results on materials ranging from Al(13) to Au(79) could be represented by the followingwhere μa is the atomic absorption coefficient, Z the atomic number. Today equation (2) is known as the “Bragg-Pierce” Law. The exponent of 5/2(n) was questioned by many investigators, and that n should be closer to 3. The work of Wingardh (3) showed that the exponent of Z should be much lower, p = 2.95, however, this is much lower than that found by most investigators.

EpCam-specific Gold Nanoparticles for Detection, Live-imaging and Rapid Enrichment of Adult Human Liver Progenitor Cells

2013 ◽  
Vol 51 (01) ◽  
Author(s):  
N Fekete-Drimusz ◽  
J de la Roche ◽  
F Vondran ◽  
CL Sajti ◽  
MP Manns ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Progenitor Cells ◽  
Human Liver ◽  
Live Imaging ◽  
Adult Human
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