Structural and Optical Properties of Nanofibers Prepared with Electrospinning by Using PMMA Integrated with Curcuminoids
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ISSN 1229-9197 (print version) ISSN 1875-0052 (electronic version)
Structural and Optical Properties of Nanofibers Prepared with Electrospinning by Using PMMA Integrated with Curcuminoids to Produce White LED M. Al Shafouri1, Naser M. Ahmed1*, Z. Hassan2, and M. A. Almessiere3 1
School of Physics, University Science Malaysia, USM Penang 11800, Malaysia Institute of Nano Optoelectronics Research and Technology (INOR), University Science Malaysia, USM Penang 11800, Malaysia 3 Department of Biophysics, Institute for Research & Medical Consultations (IRMC), Imam Abdulrahman Bin Faisal University, Dammam 31441, Saudi Arabia (Received August 24, 2019; Revised December 14, 2019; Accepted December 19, 2019)
2
Abstract: Curcuminoids, a polyphenol from turmeric (Curcuma longa L.) have well-known diverse medical benefits. However, the nature of emitted light from curcuminoids and their poor stability limit their illumination applications but can be further improved using nanofibers and nanoparticles of curcuminoids. In this study, poly(methyl methacrylate) (PMMA) integrated curcuminoid nanofibers (PICNFs) were prepared through electrospinning and characterised. PMMA was mixed with C. longa L. powder to obtain impurity-free curcuminoid solution. Solutions with altering volumes (1, 2, 3, 4 and 5 ml) were spun to grow desired PICNFs. The structural, morphological and optical properties of the as-synthesised PICNFs (with and without annealing) were evaluated as a function of various PMMA concentrations (5, 10 and 15 wt%) to determine the feasibility of improving down-conversion white light emission. The chromatic traits of the proposed PICNFs were analysed under different light-emitting diode LED pumping wavelengths (365, 390 and 445 nm). The chromaticity coordinates (CIE), correlated colour temperature (CCT) and colour rendering index (CRI) of the obtained PICNFs were measured. The FTIR spectra of as-grown PICNFs displayed various characteristic IR bands, which were assigned to the vibrations of different functional groups in the structures. The FESEM images of pre- and post-annealed samples revealed the formation of nanofibers (diameter ranging from 250 nm to 300 nm) and nanoparticles (diameter ranging from 9 nm to 18 nm). The optimum values of CIE, CRI and CCT for the studied PICNFs were (0.3092, 0.315), 76.3 and 6,856 K, respectively. Keywords: Electrospinning, Curcuminoids, Down-conversion, White light, Nanofiber
flexible processing methods and are thus suitable for sundry applications [6]. Prospective polymers include poly(methyl methacrylate) (PMMA), poly(vinyl chloride) and silicon and hydroxy acrylates. Polymers are soluble in different types of solvents, such as water, dimethylformamide (DMF), methylethyl ketone, tetrahydrofuran and ethyl acetate [8,9]. The characteristics of each polymer differ from one another and have therefore varied possible applications. For instance, polybutene is used for coating films, and cellulose acetate butyrate is utilised for irrigation pipes [10]. Other materials can be mixed with p
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