Spectroscopic imaging studies of nanoscale polarity and mass transport phenomena in self-assembled organic nanotubes

2017 ◽  
Vol 19 (30) ◽  
pp. 20040-20048 ◽  
Author(s):  
Hao Xu ◽  
Shinobu Nagasaka ◽  
Naohiro Kameta ◽  
Mitsutoshi Masuda ◽  
Takashi Ito ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Mass Transport ◽  
Fluorescence Correlation Spectroscopy ◽  
Transport Phenomena ◽  
Spectroscopic Imaging ◽  
Correlation Spectroscopy ◽  
Imaging Studies ◽  
Fluorescence Correlation ◽  
Self Assembled ◽  
Organic Nanotubes

Two-color imaging fluorescence correlation spectroscopy reveals the local dielectric constant within self-assembled synthetic organic nanotubes.

scholarly journals Imaging fluorescence correlation spectroscopy studies of dye diffusion in self-assembled organic nanotubes

2016 ◽  
Vol 18 (25) ◽  
pp. 16766-16774 ◽  
Author(s):  
Hao Xu ◽  
Shinobu Nagasaka ◽  
Naohiro Kameta ◽  
Mitsutoshi Masuda ◽  
Takashi Ito ◽  
...  
Keyword(s):  
Fluorescence Correlation Spectroscopy ◽  
Correlation Spectroscopy ◽  
Fluorescence Correlation ◽  
Dye Diffusion ◽  
Self Assembled ◽  
Spectroscopy Studies ◽  
Organic Nanotubes

Imaging fluorescence correlation spectroscopy is used to elucidate the rate and mechanism for diffusion of charged molecules within charged, self-assembled organic nanotubes.

scholarly journals Deciphering Molecular Self-Assembly through Electron Microscopy and Fluorescence Correlation Spectroscopy

2020 ◽  
Author(s):  
Subhankar Kundu ◽  
Arkaprava Chowdhury, ◽  
Somen Nandi ◽  
Kankan Bhattacharyya ◽  
Abhijit Patra
Keyword(s):  
Electron Microscopy ◽  
Self Assembly ◽  
Fluorescence Correlation Spectroscopy ◽  
Correlation Spectroscopy ◽  
The Self ◽  
Fine Tuning ◽  
Assembly Process ◽  
Molecular Aggregates ◽  
Fluorescence Correlation ◽  
Self Assembled

Supramolecular self-assembly of small organic molecules has emerged as a powerful tool to construct well-defined micro- and nanoarchitecture through fine-tuning a range of intermolecular interactions. The size, shape, and optical properties of these nanostructures largely depend on the temperature and polarity of the medium, along with the specific self-assembled pattern of molecular building units. The engineering of supramolecular self-assembled nanostructures with morphology-dependent tunable emission is in high demand due to the promising scope in nanodevices and molecular machines. However, challenges are probing the evolution of molecular aggregates from a true solution and directing the self-assembly process in a pre-defined fashion. The structure of molecular aggregates in the solution can be predicted from fluorescence correlation spectroscopy (FCS) and dynamic light scattering (DLS) analysis. On the other hand, the morphology of the aggregates can also be visualized through electron microscopy. Nevertheless, a direct correlation between emission from molecular aggregates in the aqueous dispersion and their morphology obtained through a solid-state characterization is missing. In the present study, we decipher the sequential evolution of molecular nanofibers from solution to spherical and oblong-shaped nanoparticles through the variation of solvent polarity, adjusting the <a>hydrophobic-hydrophilic interactions</a>. The intriguing case of molecular self-assembly is elucidated employing a newly designed π-conjugated thiophene derivative (TPAn) through a combination of steady-state absorption, emission measurements, FCS, and electron microscopy. The FCS analysis and microscopy results infer that small-sized nanofibers in the dispersion are further agglomerated, resulting in a network of nanofibers upon solvent evaporation. <a>The evolution of organic nanofibers and subtle control over the self-assembly process demonstrated in the current investigation provides a general paradigm to correlate the size, shape, and emission properties of diverse fluorescent molecular aggregates in complex heterogeneous media, including a human cell. </a>

scholarly journals Deciphering Molecular Self-Assembly through Electron Microscopy and Fluorescence Correlation Spectroscopy

2020 ◽  
Author(s):  
Subhankar Kundu ◽  
Arkaprava Chowdhury, ◽  
Somen Nandi ◽  
Kankan Bhattacharyya ◽  
Abhijit Patra
Keyword(s):  
Electron Microscopy ◽  
Self Assembly ◽  
Fluorescence Correlation Spectroscopy ◽  
Correlation Spectroscopy ◽  
The Self ◽  
Fine Tuning ◽  
Assembly Process ◽  
Molecular Aggregates ◽  
Fluorescence Correlation ◽  
Self Assembled

Supramolecular self-assembly of small organic molecules has emerged as a powerful tool to construct well-defined micro- and nanoarchitecture through fine-tuning a range of intermolecular interactions. The size, shape, and optical properties of these nanostructures largely depend on the temperature and polarity of the medium, along with the specific self-assembled pattern of molecular building units. The engineering of supramolecular self-assembled nanostructures with morphology-dependent tunable emission is in high demand due to the promising scope in nanodevices and molecular machines. However, challenges are probing the evolution of molecular aggregates from a true solution and directing the self-assembly process in a pre-defined fashion. The structure of molecular aggregates in the solution can be predicted from fluorescence correlation spectroscopy (FCS) and dynamic light scattering (DLS) analysis. On the other hand, the morphology of the aggregates can also be visualized through electron microscopy. Nevertheless, a direct correlation between emission from molecular aggregates in the aqueous dispersion and their morphology obtained through a solid-state characterization is missing. In the present study, we decipher the sequential evolution of molecular nanofibers from solution to spherical and oblong-shaped nanoparticles through the variation of solvent polarity, adjusting the <a>hydrophobic-hydrophilic interactions</a>. The intriguing case of molecular self-assembly is elucidated employing a newly designed π-conjugated thiophene derivative (TPAn) through a combination of steady-state absorption, emission measurements, FCS, and electron microscopy. The FCS analysis and microscopy results infer that small-sized nanofibers in the dispersion are further agglomerated, resulting in a network of nanofibers upon solvent evaporation. <a>The evolution of organic nanofibers and subtle control over the self-assembly process demonstrated in the current investigation provides a general paradigm to correlate the size, shape, and emission properties of diverse fluorescent molecular aggregates in complex heterogeneous media, including a human cell. </a>

scholarly journals Nano-antenna enhanced two-focus fluorescence correlation spectroscopy

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Lutz Langguth ◽  
Agata Szuba ◽  
Sander A. Mann ◽  
Erik C. Garnett ◽  
Gijsje H. Koenderink ◽  
...  
Keyword(s):  
Fluorescence Correlation Spectroscopy ◽  
Correlation Spectroscopy ◽  
Fluorescence Correlation
Sign in / Sign up

Export Citation Format

Share Document