scholarly journals Fiber-Laser-Based Sensor for Measuring Refractive Index and Solute Concentration of Aqueous Solutions

2008 ◽  
Author(s):  
Héctor Arellano-Sotelo ◽  
Yuri O. Barmenkov ◽  
Alexander V. Kir’yanov ◽  
Cristiano M. B. Cordeiro ◽  
Christiano J. S. de Matos
Keyword(s):  
Refractive Index ◽  
Aqueous Solutions ◽  
Fiber Laser ◽  
Solute Concentration

Motions of water molecules in dilute aqueous solutions of tertiary butyl alcohol; a neutron scattering study of hydrophobic hydration

1970 ◽  
Vol 319 (1537) ◽  
pp. 189-208 ◽  
Keyword(s):  
Aqueous Solutions ◽  
Water Structure ◽  
Hydrophobic Hydration ◽  
Step Length ◽  
Solute Concentration ◽  
Butyl Alcohol ◽  
Tertiary Butyl ◽  
Self Diffusion ◽  
Dilute Aqueous Solutions ◽  
Neutron Scattering Study

Cold neutron inelastic scattering experiments have been performed on dilute aqueous solutions of (CD 3 ) 3 COH and of solutions of (CH 3 ) 3 COH in D 2 O at 21 °C. From the broadening of the quasi-elastic peak and independently determined self-diffusion coefficients ( D ), diffusive lifetimes ( c ) of H 2 O molecules have been calculated as functions of solute concentration. The product Dc is insensitive to concentration, giving a mean diffusion step length of 0.14 nm. The inelastic portion of the spectrum, reflecting lattice-like hydrogen bonding modes indicates that the solute enhances the water ‘structure’ but that such structure bears no resemblance to ice.

Development of an Optical Fiber Sensor with a D-shaped Fiber Bragg Grating Integrated in a Loop-mirror Optical Fiber Laser as a High Sensitivity Refractometer

2021 ◽  
Vol 32 ◽  
Author(s):  
Binh Pham Thanh ◽  
Thuy Van Nguyen ◽  
Van Hoi Pham ◽  
Huy Bui ◽  
Thi Hong Cam Hoang ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Fiber Laser ◽  
Fiber Bragg Grating ◽  
Limit Of Detection ◽  
Optical Fiber Sensor ◽  
High Sensitivity ◽  
Optical Signal ◽  
Bragg Grating ◽  
Loop Mirror

In this paper, we report a new type of refractometer based on a D-shaped fiber Bragg grating (FBG) integrated in a loop-mirror optical fiber laser. This proposed sensor is used in wavelength interrogation method, in which the D-shaped FBG is applied as a refractive index (RI) sensing probe and a mirror to select mode of laser. The D-shaped FBG is prepared by the removal of a portion of the fiber cladding covering the FBG by means of side-polishing technique. The D-shaped FBG sensing probe integrated in a loop-mirror optical fiber laser with saturated pump technique, the characteristics of sensing signals have been improved to obtain stable intensity, narrower bandwidth and higher optical signal-to-noise ratio compare to normal reflection configuration. The limit of detection (LOD) of this sensor can be achieved to 2.95 x 10-4 RIU in the refractive index (RI) range of 1.42-1.44. Accordingly, we believe that the proposed refractometer has a huge potential for applications in biochemical-sensing technique.

scholarly journals Refractive Index Fiber Laser Sensor by Using Tunable Filter Based on No-Core Fiber

2016 ◽  
Vol 8 (5) ◽  
pp. 1-8 ◽  
Author(s):  
Junfa Zhao ◽  
Juan Wang ◽  
Cheng Zhang ◽  
Cuijuan Guo ◽  
Hua Bai ◽  
...  
Keyword(s):  
Refractive Index ◽  
Fiber Laser ◽  
Tunable Filter ◽  
Laser Sensor ◽  
Core Fiber

A simple model for the refractive index of sodium iodide aqueous solutions

2000 ◽  
Vol 28 (3) ◽  
pp. 282-283 ◽  
Author(s):  
T. L. Narrow ◽  
M. Yoda ◽  
S. I. Abdel-Khalik
Keyword(s):  
Refractive Index ◽  
Simple Model ◽  
Aqueous Solutions ◽  
Sodium Iodide

scholarly journals Ice–Brine Dendritic Aggregate formed on Freezing of Aqueous Solutions

1967 ◽  
Vol 6 (47) ◽  
pp. 663-679 ◽  
Author(s):  
P. K. Rohatgi ◽  
C. M. Adams
Keyword(s):  
Aqueous Solutions ◽  
Solute Concentration ◽  
Dendrite Spacing ◽  
Freezing Rate ◽  
Square Root ◽  
Sodium Potassium ◽  
Binary Solutions ◽  
Chill Surface ◽  
Unidirectional Freezing ◽  
Solute Diffusivity

Dendritic aggregates of ice and brine formed upon freezing of aqueous solutions have been studied. Chlorides of sodium, potassium, lithium and hydrogen were used as solutes; structures produced on freezing of binary, ternary and quaternary solutions were examined. Effects of freezing rate, solute concentration, solute diffusivity, mixing of solutions and magnetic fields are reported. The spacing between ice platelets or dendrites was found experimentally to be proportional to the square root of the freezing time when the freezing rate was constant from beginning to end of solidification. During unidirectional freezing from a constant temperature chill, the solution at each location is subjected to a spectrum of freezing rates; dendrite spacing increases linearly with distance from the chill surface and it is inversely proportional to the square root of the maximum freezing rate. In binary solutions dendrite spacing increases linearly with solute concentration; above a critical solute concentration ice platelets develop side branches. Application of an external magnetic field has an effect similar to increasing concentration. At a given solute concentration, spacing between ice dendrites increases linearly with solute diffusivity. In ternary and quaternary solutions dendrite spacing is a function of the concentrations and diffusivities of each of the constituent solutes.

scholarly journals Removal of Nickel(II) from Aqueous Solutions by Adsorption with Modified ZSM- 5 Zeolites

2009 ◽  
Vol 6 (3) ◽  
pp. 729-736 ◽  
Author(s):  
P. Panneerselvam ◽  
V. Sathya Selva Bala ◽  
N. Thinakaran ◽  
P. Baskaralingam ◽  
M. Palanichamy ◽  
...  
Keyword(s):  
Phosphoric Acid ◽  
Aqueous Solutions ◽  
Solute Concentration ◽  
Y Zeolite ◽  
Nickel Ion ◽  
Freundlich Model ◽  
Modified Zeolite ◽  
Equilibrium Modeling ◽  
Different Temperatures ◽  
Modeling Data

The sorptive removal of nickel ion from aqueous solutions using modified ZSM-5 zeolites was investigated. Experiments were carried out as a function of solute concentration and different temperatures. Mesoporous material of ZSM-5 zeolite was modified with phosphoric acid by wet method. The modified zeolite was converted to Na+form using aqueous NaHCO3solution. The Na+form of modified zeolite, represented as PNa2--ZSM-5 was characterized by XRD, BET, SEM and AAS techniques. It was then tested for ion exchange with aqueous Ni(SO4) solution. The Ni2+content of the solution was analyzed by AAS. Phosphoric acid modified PNa2--ZSM-5 zeolite shows higher adsorption capacity than the parent Na-Y zeolite. Equilibrium modeling data were fit to linear Langmuir model then the Freundlich model. These parameter confirmed that sorption of Ni2+is feasible spontaneous and endothermic.

Sign in / Sign up

Export Citation Format

Share Document