scholarly journals SPECTROSCOPIC STUDY OF THE PROCESS OF HYPOCHROMIC EFFECT IN SOL T IN SOLUTIONS OF N UTIONS OF NATURAL D TURAL DYES AND VI YES AND VITAMIN B2 AMIN B2

2020 ◽  
Vol 4 (3) ◽  
pp. 21-27
Author(s):  
Salikh Khusenovich Astanov ◽  
◽  
Siddiq Kakhkharovich Kakhkharov ◽  
Keyword(s):  
Spectroscopic Study ◽  
Binary Mixtures ◽  
Self Assembly ◽  
Spectroscopic Method ◽  
Dipole Interaction ◽  
Absorption Capacity ◽  
Vitamin B2 ◽  
Intense Absorption ◽  
Hypochromic Effect

The process of self-assembly of riboflavin molecules in aqueous and binary mixtures of solvents was investigated by the spectroscopic method. It was shown that during the assembly of vitamin B2 molecules, dipole-dipole interaction occurs, as a result of which resonant splitting of excited electronic levels of riboflavin molecules occurs. And the observable hypo chromic effect is due to a decrease in the intense absorption capacity of the aggregated riboflavin molecules themselves.

Self-assembly and patterns in binary mixtures of SI block copolymer and PPO

1991 ◽  
Vol 24 (20) ◽  
pp. 5704-5712 ◽  
Author(s):  
Takeji Hashimoto ◽  
Kohtaro Kimishima ◽  
Hirokazu Hasegawa
Keyword(s):  
Block Copolymer ◽  
Binary Mixtures ◽  
Self Assembly

Quantitative Analysis of Binary Mixtures. I. General Method

1981 ◽  
Vol 35 (4) ◽  
pp. 421-428 ◽  
Author(s):  
Hugh E. Diem ◽  
Samuel Krimm
Keyword(s):  
Quantitative Analysis ◽  
Binary Mixtures ◽  
Spectroscopic Method ◽  
Scaling Factors ◽  
External Calibration ◽  
Original Mixture ◽  
Analytical Results ◽  
Fractionation Procedure ◽  
General Method

A general spectroscopic method for the analysis of binary mixtures which does not require external calibration has been developed. Spectra of the original mixture and of the mixture following some fractionation procedure are obtained. The method is based on the scaling factors required to null the components, one at a time, in successive absorbance subtractions of the two spectra. The accuracy is improved by a factor of approximately ten more than that of an earlier method. The effect of errors in the scaling factors on the analytical results is considered.

Towards understanding the NTB phase: a combined experimental, computational and spectroscopic study

RSC Advances ◽  
2016 ◽  
Vol 6 (6) ◽  
pp. 5000-5007 ◽  
Author(s):  
Trpimir Ivšić ◽  
Marijana Vinković ◽  
Ute Baumeister ◽  
Ana Mikleušević ◽  
Andreja Lesac
Keyword(s):  
Spectroscopic Study ◽  
Hierarchical Model ◽  
Self Assembly ◽  
Parallel Orientation

Combined studies support the hierarchical model for the NTB phase that involves formation of embryonic self-assembly of the propeller-shaped dimeric molecules with syn-parallel orientation in the isotropic melt.

SPECTROSCOPY OF A NON-L TROSCOPY OF A NON-LUMINESCEN UMINESCENT ASSOCI T ASSOCIATE OF INDIGO CARMINE IN SOLUTIONS

2021 ◽  
Vol 5 (2) ◽  
pp. 3-15
Author(s):  
Solikh Khusenovich Astanov ◽  
◽  
Mirzohid Islomovich Daminov ◽  
Guzal Karimovana Kasimova ◽  
Rustam Khalilovich Shamsiev ◽  
...  
Keyword(s):  
Binary Mixtures ◽  
Dipole Moments ◽  
Indigo Carmine ◽  
Electron Transition ◽  
Dipole Interaction ◽  
Interaction Force ◽  
Spectroscopic Studies ◽  
Absorption Bands ◽  
Food Dye ◽  
Strong Dipole

Introduction. The food dye Indigo Carmine (E-132) was subjected to spectroscopic studies. It is shown that conditions for their participation in Association processes are created in aqueous and binary mixtures of solvents. The absorption bands against the background of the hypochromic effect in their electronic spectra are determined. Experimentally and by quantum chemical calculations, it is established that the dipole moments of the Indigo Carmine dye in the excited state increase up to 40 % and they contribute to the appearance of a strong dipole-dipole interaction, which results in the unification of Monomeric molecules into an associate. The interaction force (van der Waals) leads to resonant splitting of electronic States and changes in the probability of electron transition from the main excited levels of dye molecules. Research methods. The choice of binary mixtures of solvents was due to the fact that in one of the components of the solvents the dyes under study dissolved well, in the other they practically did not dissolve

One-step synthesis and self-assembly of a luminescent sponge-like network of gold nanoparticles with high absorption capacity

2017 ◽  
Vol 5 (28) ◽  
pp. 6917-6922 ◽  
Author(s):  
Jiayi Zhu ◽  
Qian Lu ◽  
Chiyun Chen ◽  
Jianqiang Hu ◽  
Jinbin Liu
Keyword(s):  
Heavy Metal ◽  
Gold Nanoparticles ◽  
Self Assembly ◽  
Metal Ion ◽  
High Capacity ◽  
Absorption Capacity ◽  
Ion Absorption ◽  
One Step ◽  
Metal Ion Absorption ◽  
High Absorption

One-step strategy to fabricate a luminescent sponge-like network of AuNPs with a high capacity for heavy metal ion absorption.

scholarly journals Structural transition in alcohol-water binary mixtures: A spectroscopic study

2008 ◽  
Vol 120 (2) ◽  
pp. 275-287 ◽  
Author(s):  
Tuhin Pradhan ◽  
Piue Ghoshal ◽  
Ranjit Biswas
Keyword(s):  
Spectroscopic Study ◽  
Binary Mixtures ◽  
Structural Transition ◽  
Alcohol Water

scholarly journals Self-assembly of smallest magnetic particles

2015 ◽  
Vol 112 (47) ◽  
pp. 14484-14489 ◽  
Author(s):  
Sara Mehdizadeh Taheri ◽  
Maria Michaelis ◽  
Thomas Friedrich ◽  
Beate Förster ◽  
Markus Drechsler ◽  
...  
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Data Storage ◽  
Self Assembly ◽  
Magnetic Particles ◽  
Dipole Interaction ◽  
The Self ◽  
Magnetic Structures ◽  
Medical Technologies ◽  
1D Chains

The assembly of tiny magnetic particles in external magnetic fields is important for many applications ranging from data storage to medical technologies. The development of ever smaller magnetic structures is restricted by a size limit, where the particles are just barely magnetic. For such particles we report the discovery of a kind of solution assembly hitherto unobserved, to our knowledge. The fact that the assembly occurs in solution is very relevant for applications, where magnetic nanoparticles are either solution-processed or are used in liquid biological environments. Induced by an external magnetic field, nanocubes spontaneously assemble into 1D chains, 2D monolayer sheets, and large 3D cuboids with almost perfect internal ordering. The self-assembly of the nanocubes can be elucidated considering the dipole–dipole interaction of small superparamagnetic particles. Complex 3D geometrical arrangements of the nanodipoles are obtained under the assumption that the orientation of magnetization is freely adjustable within the superlattice and tends to minimize the binding energy. On that basis the magnetic moment of the cuboids can be explained.

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