Angular correlation in linear copolymers from the compositional dependence of their dipole moments. VI. Time dependent correlations in poly(4‐chlorostyrene, 4‐methylstyrene) copolymers

1979 ◽  
Vol 70 (11) ◽  
pp. 4952-4958 ◽  
Author(s):  
Richard N. Work
Keyword(s):  
Angular Correlation ◽  
Dipole Moments ◽  
Time Dependent ◽  
Compositional Dependence

Effect of ( n, γ ) recoil on the γ-γ angular correlation in polycrystalline Hf (IV) benzoyl-phenyl-hydroxylamine complex

1969 ◽  
Vol 311 (1504) ◽  
pp. 191-195 ◽  
Keyword(s):  
Thermal Neutron ◽  
Angular Correlation ◽  
Neutron Capture ◽  
Chemical Species ◽  
Time Dependent ◽  
Thermal Neutron Capture ◽  
After Effects

The time-dependent anisotropy of the differential 133-482 keV γ-γ angular correlation in synthetic, 3 and 24 h pile irradiated ( BPHA ) 4 Hf indicates the occurrence of considerable thermal neutron capture after-effects and suggest the formation of at least three chemical species in the irradiated complex.

scholarly journals Substituent Effects on the Solubility and Electronic Properties of the Cyanine Dye Cy5: Density Functional and Time-Dependent Density Functional Theory Calculations

Molecules ◽  
2021 ◽  
Vol 26 (3) ◽  
pp. 524
Author(s):  
Austin Biaggne ◽  
William B. Knowlton ◽  
Bernard Yurke ◽  
Jeunghoon Lee ◽  
Lan Li
Keyword(s):  
Density Functional Theory ◽  
Dipole Moment ◽  
Density Functional ◽  
Dipole Moments ◽  
Time Dependent ◽  
Cyanine Dye ◽  
Transition Dipole ◽  
Functional Theory ◽  
Solvation Energies ◽  
Transition Dipole Moments

The aggregation ability and exciton dynamics of dyes are largely affected by properties of the dye monomers. To facilitate aggregation and improve excitonic function, dyes can be engineered with substituents to exhibit optimal key properties, such as hydrophobicity, static dipole moment differences, and transition dipole moments. To determine how electron donating (D) and electron withdrawing (W) substituents impact the solvation, static dipole moments, and transition dipole moments of the pentamethine indocyanine dye Cy5, density functional theory (DFT) and time-dependent (TD-) DFT calculations were performed. The inclusion of substituents had large effects on the solvation energy of Cy5, with pairs of withdrawing substituents (W-W pairs) exhibiting the most negative solvation energies, suggesting dyes with W-W pairs are more soluble than others. With respect to pristine Cy5, the transition dipole moment was relatively unaffected upon substitution while numerous W-W pairs and pairs of donating and withdrawing substituents (D-W pairs) enhanced the static dipole difference. The increase in static dipole difference was correlated with an increase in the magnitude of the sum of the Hammett constants of the substituents on the dye. The results of this study provide insight into how specific substituents affect Cy5 monomers and which pairs can be used to engineer dyes with desired properties.

Time-dependent perturbed angular correlation study of181Ta in Mg

1979 ◽  
Vol 7 (1) ◽  
pp. 425-427 ◽  
Author(s):  
S. N. A. Jaaffrey ◽  
B. L. Chawat ◽  
S. S. Sharma ◽  
J. Varma
Keyword(s):  
Angular Correlation ◽  
Perturbed Angular Correlation ◽  
Correlation Study ◽  
Time Dependent

scholarly journals Superior improvement in dynamic response of liquid crystal lens using organic and inorganic nanocomposite

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Che Ju Hsu ◽  
Bhupendra Pratap Singh ◽  
Pravinraj Selvaraj ◽  
Mareena Antony ◽  
Rajiv Manohar ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Liquid Crystal ◽  
Synergistic Effect ◽  
Electric Fields ◽  
Dipole Moments ◽  
Time Dependent ◽  
Titanium Dioxide Nanoparticle ◽  
Phase Profile ◽  
Rutile Titanium Dioxide ◽  
Liquid Crystal Lens

AbstractIn this study, the response time of a 4 mm-aperture hole-patterned liquid crystal (HLC) lens has been significantly improved with doping of N-benzyl-2-methyl-4-nitroaniline (BNA) and rutile titanium dioxide nanoparticle (TiO2 NP) nanocomposite. The proposed HLC lens provides the focus and defocus times that are 8.5× and 14× faster than the pristine HLC lens, respectively. Meanwhile, the focus and defocus times of the proposed HLC lens reach the order of millisecond. Result shows that the synergistic effect of BNA and TiO2 NP induces a 78% decrement in the viscosity of pristine LC mixture that significantly shortens the focus and defocus times of HLC lens. The remarkable decrement in viscosity is mainly attributed to spontaneous polarization electric fields from the permanent dipole moments of the additives. Besides, the strengthened electric field surrounding TiO2 NP assists in decreasing the focus time of HLC lens. The focus and defocus times of HLC lens are related to the wavefront (or phase profile) bending speed. The time-dependent phase profiles of the HLC lenses with various viscosities are calculated. This result shows the decrease in wavefront bending time is not simply proportional to viscosity decrement. Furthermore, the proposed HLC lens emerges a larger tunable focus capability within smaller voltage interval than the pristine HLC lens.

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