Graphene quantum dot doped viscoelastic lyotropic liquid crystal nanocolloids for antibacterial applications

Graphene quantum dots (GQDs) are prepared and characterized via X-ray diffraction (XRD), UV-Visible spectroscopy, atomic force microscopy (AFM), transmission electron microscopy (TEM) and photoluminescence (PL). GQDs are doped (5 mg and 10 mg) in the lyotropic liquid crystalline (LLC) lamellar and h...

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Bibliographic Details
Published in:Soft matter 2023-08, Vol.19 (34), p.6589-663
Main Authors: Singh, Prayas, Farheen, Sachdev, Surbhi, Manori, Samta, Bhardwaj, Sumit, Chitme, Havagiray, Sharma, Ashish, Raina, Kuldeep Kumar, Shukla, Ravi K
Format: Article
Language:English
Subjects:
Antibacterial activity
Antimicrobial activity
Atomic force microscopy
Cosmetics
Electrons
Graphene
Hexagonal phase
Lamellar structure
Light microscopy
Liquid crystals
Microscopy
Optical microscopy
Photoluminescence
Photons
Quantum dots
Rheological properties
Shear thinning (liquids)
Spectroscopy
Transmission electron microscopy
Viscoelasticity
X-ray diffraction
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Summary:Graphene quantum dots (GQDs) are prepared and characterized via X-ray diffraction (XRD), UV-Visible spectroscopy, atomic force microscopy (AFM), transmission electron microscopy (TEM) and photoluminescence (PL). GQDs are doped (5 mg and 10 mg) in the lyotropic liquid crystalline (LLC) lamellar and hexagonal phases to prepare GQD/LLC nanocolloids. Polarizing optical microscopy and X-ray diffraction measurement reveals that GQDs do not affect the lamellar and hexagonal LLC structures and may organize on their interface. Pure LLC phases and nanocolloids are studied for steady and dynamic rheological behavior. LLC phases and GQD/LLC nanocolloids possess shear thinning and frequency dependent liquid viscoelastic behavior. A complex moduli study of LLCs and GQD/LLC nanocolloids is carried out which indicates the gel to viscous transition in LLCs and GQD/LLC nanocolloids as a function of frequency. LLC phases and GQD/LLC nanocolloids are tested for antibacterial activity against Listeria ivanovii. The effect of surfactant concentration, LLC phase geometry and GQD concentration has been studied and discussed. A probable mechanism for the strong antimicrobial activity of LLCs and GQD/LLC nanocolloids is presented considering intermolecular interactions. The viscoelastic behavior and strong antibacterial activity (inhibition zone 49.2 mm) of LLCs and GQD/LLC nanocolloids make them valuable candidates for lubrication, cleaning, cosmetics and pharmaceutical applications. Antibacterial study (a) control, negative control and GQDs (b) 10:90 wt% pure (S1) 5 mg (S2) and 10 mg (S3) GQDs/LLC nanocolloids (c) 30:70 wt% pure (S4), 5 mg (S5) and 10 mg (S6) GQDs/LLC nanocolloids and (d, e & f) Inhabitation image analysis.
ISSN:1744-683X
1744-6848
DOI:10.1039/d3sm00686g