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Singh P, Farheen, Sachdev S, Manori S, Bhardwaj S, Chitme H, Sharma A, Raina KK, Shukla RK. Graphene quantum dot doped viscoelastic lyotropic liquid crystal nanocolloids for antibacterial applications. SOFT MATTER 2023; 19:6589-6603. [PMID: 37605525 DOI: 10.1039/d3sm00686g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/23/2023]
Abstract
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.
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Affiliation(s)
- Prayas Singh
- Advanced Functional Smart Materials Laboratory, School of Physical Sciences, Department of Physics, DIT University, Dehradun, Uttarakhand, 248009, India.
| | - Farheen
- School of Medical and Allied Sciences, K. R. Mangalam University, Gurugram, Haryana, 122103, India
| | - Surbhi Sachdev
- Advanced Functional Smart Materials Laboratory, School of Physical Sciences, Department of Physics, DIT University, Dehradun, Uttarakhand, 248009, India.
| | - Samta Manori
- Advanced Functional Smart Materials Laboratory, School of Physical Sciences, Department of Physics, DIT University, Dehradun, Uttarakhand, 248009, India.
| | - Sumit Bhardwaj
- Department of Physics, Chandigarh University, Chandigarh, 140413, India
| | - Havagiray Chitme
- School of Pharmaceutical & Populations Health Informatics, Department of Pharmacy, DIT University, Dehradun, Uttarakhand, 248009, India
| | - Ashish Sharma
- Advanced Functional Smart Materials Laboratory, School of Physical Sciences, Department of Physics, DIT University, Dehradun, Uttarakhand, 248009, India.
| | | | - Ravi K Shukla
- Advanced Functional Smart Materials Laboratory, School of Physical Sciences, Department of Physics, DIT University, Dehradun, Uttarakhand, 248009, India.
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