scholarly journals Enhanced Refractive Index Sensing Performance Using Hydrothermally Prepared Tricomposite Nanoflower Structure of Ta2O5:Si:Graphite

2021 ◽  
Author(s):  
Farhan Ahmad ◽  
Shafaque Rahman ◽  
Rana Tabassum ◽  
Aurangzeb Khurram Hafiz
Keyword(s):  
Refractive Index ◽  
Absorption Spectra ◽  
Limit Of Detection ◽  
Refractive Indices ◽  
Refractive Index Measurement ◽  
Refractive Index Sensing ◽  
Peak Absorption ◽  
Ftir Characterization ◽  
Index Measurement ◽  
Structure Solution

Abstract We describe a tricomposite nanoflower structure based method to measure the trace amount of refractive index in aqueous solutions. It utilizes tantalum (v) oxide, silicon and graphite to fabricate the tricomposite nanostructures. The tricomposite nanoflower structures were prepared using hydrothermal method where the concentration of (x) of Si in Ta2O5 was varied while the concentration of graphite was kept constant. The concentration of Si in Ta2O5 was measured by Maxwell-Garnett model using volume filling factor 'f' (0≤f≤1) of Si in Ta2O5. The fabricated Ta2O5:Si:Graphite tricomposite nanoflower structures were characterized by SEM, XRD, UV-Vis, PL, FTIR characterization techniques. Then aqueous solution of varying refractive indices were prepared in the range 1.33-1.39 in the already prepared tricomposite nanoflower structure solution. The refractive index measurement were probed by measuring absorption spectra corresponding to each tricomposite nanoflower structures. The performance of the sensor was explored in terms of shift in peak absorption spectra, sensitivity and moreover the limit of detection. The sensor shows sensitivity and limit of detection of (156-260) nm/RIU and 5.14x10-3 RIU respectively. A linear declining of sensitivity was observed within the refractive index range. The sensor possesses a distinguished feature of using tricomposite nanoflower structure which is an efficient method for refractive index measurement.

scholarly journals Spectrally Resolved White Light Interferometry for NaCl Aqueous Solutions Refractive Index Measurement

2021 ◽  
Vol 9 ◽  
Author(s):  
Igor G. Likhachev ◽  
Vladimir I. Pustovoy ◽  
Boris A. Usievich
Keyword(s):  
Refractive Index ◽  
Refractive Indices ◽  
White Light Interferometry ◽  
Salt Solutions ◽  
Refractive Index Measurement ◽  
Low Concentrations ◽  
Index Measurement ◽  
Different Types ◽  
Spectral Detection ◽  
Spectrally Resolved

In this work, a technique for comparing refractive indices for solutions of low concentrations has been developed. The method of direct spectral detection developed by the authors has been using. The solutions of low and ultra-low NaCl concentrations were compared with each other, as well as with the respective water controls. The solutions were prepared using the method of serial dilution with different types of mixing at each step: conventional stirring or intensive shaking. Measurements were made for water solutions of NaCl subjected to 6–12 and 30 hundredfold dilution, as well as for water controls, i.e. water subjected to the same technological procedure as the tested salt solutions.

The Physical Nature of the Lipid Globules in the Living Neurones of Helix aspersa as indicated by Measurements of Refractive Index

1957 ◽  
Vol s3-98 (43) ◽  
pp. 341-348
Author(s):  
K.F. A. ROSS ◽  
J.T. Y. CHOU
Keyword(s):  
Refractive Index ◽  
Physical Nature ◽  
Helix Aspersa ◽  
Refractive Indices ◽  
Refractive Index Measurement ◽  
Cytoplasmic Inclusions ◽  
Additional Information ◽  
Physico Chemical ◽  
Index Measurement ◽  
Made In

The lipid globules in the neurones of Helix aspersa have been found by Chou in 1957 to be of three distinct kinds that differ from each other in chemical composition. In the present investigation, the refractive indices of these three kinds of globule were measured by the technique for measuring the refractive indices of cytoplasmic inclusions in living cells developed by Ross in 1954, which is here described in detail. It was found that the refractive indices of the globules containing mixed lipids and proteins and those that probably contained triglycerides alone, all had relatively high efractive indices of about 1.47-1.50. These values are comparable with the known refractive indices of many pure lipids. The refractive indices of the globules containing phospholipid were much lower, being about 1.41-1.42, which is lower than that of any pure lipid. This indicates that these globules probably also contain appreciable amounts of water associated with the phospholipid molecules, as was suggested by Schmidt in 1939. The results also show that refractive index measurement made in conjunction with histochemical investigations may, in some cases, provide useful additional information about the physico-chemical nature of cell constituents.

scholarly journals Development of a Temperature-Controlled Optical Planar Waveguide Sensor with Lossy Mode Resonance for Refractive Index Measurement

Photonics ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 199
Author(s):  
Yu-Cheng Lin ◽  
Liang-Yü Chen
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Temperature Control ◽  
Planar Waveguide ◽  
Metallic Oxide ◽  
Refractive Index Measurement ◽  
Index Measurement ◽  
Temperature Controlled ◽  
Optical Planar Waveguide ◽  
Active Temperature

The generation of lossy mode resonances (LMR) with a metallic oxide film deposited on an optical fiber has attracted the attention of many applications. However, an LMR-based optical fiber sensor is frangible, and therefore it does not allow control of the temperature and is not suited to mass production. This paper aims to develop a temperature-controlled lossy mode resonance (TC-LMR) sensor on an optical planar waveguide with an active temperature control function in which an ITO film is not only used as the LMR resonance but also to provide the heating function to achieve the benefits of compact size and active temperature control. A simple flat model about the heat transfer mechanism is proposed to determine the heating time constant for the applied voltages. The TC-LMR sensor is evaluated experimentally for refractive index measurement using a glycerol solution. The heating temperature functions relative to the controlled voltages for water and glycerol are obtained to verify the performance of the TC-LMR sensor. The TC-LMR sensor is a valuable sensing device that can be used in clinical testing and point of care for programming heating with precise temperature control.

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