Synthesis of New Liquid Crystals Embedded Gold Nanoparticles for Photoswitching Properties

A new series of liquid crystals decorated gold nanoparticles is synthesized whose molecular architecture has azobenzenes moieties as the peripheral units connected to gold nanoparticles (Au NPs) via alkyl groups. The morphology and mesomorphic properties were investigated by field emission scanning...

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Main Authors:	Lutfor, M. R., Tapan, Kumar Biswas, Sarkar, Shaheen M., M. M., Yusoff, A. R., Yuvaraj, Sandeep, Kumar
Format:	Article
Language:	English
Published:	Elsevier Ltd 2016
Subjects:	Q Science (General)
Online Access:	http://umpir.ump.edu.my/id/eprint/14391/ http://umpir.ump.edu.my/id/eprint/14391/ http://umpir.ump.edu.my/id/eprint/14391/ http://umpir.ump.edu.my/id/eprint/14391/1/Synthesis%20of%20New%20Liquid%20Crystals%20Embedded%20Gold%20Nanoparticles%20for%20Photoswitching%20Properties.pdf

id	ump-14391
recordtype	eprints
spelling	ump-143912018-02-06T06:12:39Z http://umpir.ump.edu.my/id/eprint/14391/ Synthesis of New Liquid Crystals Embedded Gold Nanoparticles for Photoswitching Properties Lutfor, M. R. Tapan, Kumar Biswas Sarkar, Shaheen M. M. M., Yusoff A. R., Yuvaraj Sandeep, Kumar Q Science (General) A new series of liquid crystals decorated gold nanoparticles is synthesized whose molecular architecture has azobenzenes moieties as the peripheral units connected to gold nanoparticles (Au NPs) via alkyl groups. The morphology and mesomorphic properties were investigated by field emission scanning electron microscope, high-resolution transmission electron microscopy, differential scanning calorimetry and polarizing optical microscopy. The thiolated ligand molecules (3a–c) showed enantiotropic smectic A phase, whereas gold nanoparticles (5a–c) exhibit nematic and smectic A phase with monotropic nature. HR-TEM measurement showed that the functionalized Au NPs are of the average size of 2 nm and they are well dispersed without any aggregation. The trans-form of azo compounds showed a strong band in the UV region at ∼378 nm for the π-π∗ transition, and a weak band in the visible region at ∼472 nm due to the n-π∗ transition. These molecules exhibit attractive photoisomerization behaviour in which trans-cis transition takes about 15 s whereas the cis-trans transition requires about 45 min for compound 5c. The extent of reversible isomerization did not decay after 10 cycles, which proved that the photo-responsive properties of 5c were stable and repeatable. Therefore, these materials may be suitably exploited in the field of molecular switches and the optical storage devices. Elsevier Ltd 2016 Article PeerReviewed application/pdf en http://umpir.ump.edu.my/id/eprint/14391/1/Synthesis%20of%20New%20Liquid%20Crystals%20Embedded%20Gold%20Nanoparticles%20for%20Photoswitching%20Properties.pdf Lutfor, M. R. and Tapan, Kumar Biswas and Sarkar, Shaheen M. and M. M., Yusoff and A. R., Yuvaraj and Sandeep, Kumar (2016) Synthesis of New Liquid Crystals Embedded Gold Nanoparticles for Photoswitching Properties. Journal of Colloid and Interface Science, 478. pp. 384-393. ISSN 0021-9797 http://dx.doi.org/10.1016/j.jcis.2016.06.039 DOI: 10.1016/j.jcis.2016.06.039
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Pahang
building	UMP Institutional Repository
collection	Online Access
language	English
topic	Q Science (General)
spellingShingle	Q Science (General) Lutfor, M. R. Tapan, Kumar Biswas Sarkar, Shaheen M. M. M., Yusoff A. R., Yuvaraj Sandeep, Kumar Synthesis of New Liquid Crystals Embedded Gold Nanoparticles for Photoswitching Properties
description	A new series of liquid crystals decorated gold nanoparticles is synthesized whose molecular architecture has azobenzenes moieties as the peripheral units connected to gold nanoparticles (Au NPs) via alkyl groups. The morphology and mesomorphic properties were investigated by field emission scanning electron microscope, high-resolution transmission electron microscopy, differential scanning calorimetry and polarizing optical microscopy. The thiolated ligand molecules (3a–c) showed enantiotropic smectic A phase, whereas gold nanoparticles (5a–c) exhibit nematic and smectic A phase with monotropic nature. HR-TEM measurement showed that the functionalized Au NPs are of the average size of 2 nm and they are well dispersed without any aggregation. The trans-form of azo compounds showed a strong band in the UV region at ∼378 nm for the π-π∗ transition, and a weak band in the visible region at ∼472 nm due to the n-π∗ transition. These molecules exhibit attractive photoisomerization behaviour in which trans-cis transition takes about 15 s whereas the cis-trans transition requires about 45 min for compound 5c. The extent of reversible isomerization did not decay after 10 cycles, which proved that the photo-responsive properties of 5c were stable and repeatable. Therefore, these materials may be suitably exploited in the field of molecular switches and the optical storage devices.
format	Article
author	Lutfor, M. R. Tapan, Kumar Biswas Sarkar, Shaheen M. M. M., Yusoff A. R., Yuvaraj Sandeep, Kumar
author_facet	Lutfor, M. R. Tapan, Kumar Biswas Sarkar, Shaheen M. M. M., Yusoff A. R., Yuvaraj Sandeep, Kumar
author_sort	Lutfor, M. R.
title	Synthesis of New Liquid Crystals Embedded Gold Nanoparticles for Photoswitching Properties
title_short	Synthesis of New Liquid Crystals Embedded Gold Nanoparticles for Photoswitching Properties
title_full	Synthesis of New Liquid Crystals Embedded Gold Nanoparticles for Photoswitching Properties
title_fullStr	Synthesis of New Liquid Crystals Embedded Gold Nanoparticles for Photoswitching Properties
title_full_unstemmed	Synthesis of New Liquid Crystals Embedded Gold Nanoparticles for Photoswitching Properties
title_sort	synthesis of new liquid crystals embedded gold nanoparticles for photoswitching properties
publisher	Elsevier Ltd
publishDate	2016
url	http://umpir.ump.edu.my/id/eprint/14391/ http://umpir.ump.edu.my/id/eprint/14391/ http://umpir.ump.edu.my/id/eprint/14391/ http://umpir.ump.edu.my/id/eprint/14391/1/Synthesis%20of%20New%20Liquid%20Crystals%20Embedded%20Gold%20Nanoparticles%20for%20Photoswitching%20Properties.pdf
first_indexed	2023-09-18T22:18:05Z
last_indexed	2023-09-18T22:18:05Z
_version_	1777415472514334720

Synthesis of New Liquid Crystals Embedded Gold Nanoparticles for Photoswitching Properties

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