Department of Chemistry

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Subject: search.filters.subject.Nanocomposites

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Now showing 1 - 5 of 5
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    Synthesis and Characterization of COF based Nanocomposites as Photocatalyst
    (Library Information Services COMSATS University Islamabad Lahore Campus, 2023-02-27) Talha Rafi; FA21-R06-027; Dr. Muhammad Shahid Nazir; LHR TP 8457
    Dyes are synthetic organic compounds that are abundantly used in industries. The use of these dyes is major contributors towards environmental pollution. Their hazardous nature raises great concerns in general public. Advancement in nanotechnology can efficiently help in mitigating this problem as nanoparticles can efficiently convert these harmful dyes into less harmful chemical byproducts through a process called Photocatalysis. COF has been reported as photocatalyst with less stability and efficiency. In this paper, new modification of COF-LZU-1 was reported by dopping Cu, Zn, Fe and Ag metals into COF-LZU-1 nanoparticles by simple solvothermal method. Degradation of 40ppm methylene blue and congo red dye was reported by adding 2mg of each metal modified COF-LZU-1. Cu being and excellent photocatalyst with smallest bend gap of 2.1eV, degraded Congo Red dye (95.7%) and Methylene Blue dye (80%). All these metals do not change actual structure of COF-LZU-1 but enhanced photocatalytic activity of COF-LZU-1.
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    Synthesis and Characterization of COF based Nanocomposites as Photocatalyst
    (Library Information Services COMSATS University Islamabad Lahore Campus, 2023-02-26) Talha Rafi; FA21-R06-027; Dr. Muhammad Shahid Nazir; LHR TP 8457
    Dyes are synthetic organic compounds that are abundantly used in industries. The use of these dyes is major contributors towards environmental pollution. Their hazardous nature raises great concerns in general public. Advancement in nanotechnology can efficiently help in mitigating this problem as nanoparticles can efficiently convert these harmful dyes into less harmful chemical byproducts through a process called Photocatalysis. COF has been reported as photocatalyst with less stability and efficiency. In this paper, new modification of COF-LZU-1 was reported by dopping Cu, Zn, Fe and Ag metals into COF-LZU-1 nanoparticles by simple solvothermal method. Degradation of 40ppm methylene blue and congo red dye was reported by adding 2mg of each metal modified COF-LZU-1. Cu being and excellent photocatalyst with smallest bend gap of 2.1eV, degraded Congo Red dye (95.7%) and Methylene Blue dye (80%). All these metals do not change actual structure of COF-LZU-1 but enhanced photocatalytic activity of COF-LZU-1.
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    Synthesis and Characterization of rGO-coated PMMA Beads Based TPU Nanocomposites for Gas Sensing Application
    (Library Information Services COMSATS University Islamabad Lahore Campus, 2021-02-25) FA19-R06-029; Muhammad Saqlain Iqbal; Dr. S. M. Imran Hassan; LHR TP 7323
    Nanocomposites of polymers have recently gotten a lot of interest in the materials world since they often have more advanced properties than their counterpart polymer micro-composites. A novel reduced graphene oxide (rGO)coated poly (methyl methacrylate) (PMMA) beads based thermoplastic polyurethane (TPU) nanocomposites were prepared by the melt mixing method. Graphene oxide was synthesized by following improved hummer’s method and reduce it thermally at 300 oC. The PMMA beads were coated with reduced graphene oxide by the solution mixing method and then this synthesized rGO coated PMMA beads were introduced in TPU matrix in 1, 2, 5, and 8 % wt. of TPU along with 1% carbon nanotubes (CNTs) by following melt mixing method in an internal mixer. Scanning electron microscopy (SEM) was performed to examine the dispersion of fillers in the nanocomposites. Fourier transform infrared spectroscopy (FTIR) was applied for functional groups analysis. X-ray diffraction analysis results were obtained to know about the crystal structure of the GO, rGO and rGO coated PMMA beads. Raman spectrum was obtained to know the defects after oxidation and reduction of graphite and GO, respectively. The effect of rGO coated PMMA and CNTs was observed on the conductivity properties of the synthesized polymer nanocomposites. Electrical conductivity values were obtained using four probe for these nanocomposites and the data showed that the synthesized polymer nanocomposites were conductive. Gas sensing application of these composites could be possible.
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    Improvement in the Flame-Retardant and Mechanical Properties of Thermoplastic Polyurethane Nanocomposites
    (Library Information Services COMSATS University Islamabad Lahore Campus, 2020-02-19) Sidra Faryal; SP19-R06-027; Dr. Imran Hassan; LHR TP 6539
    Recently, nanocomposites of polymers gained much attention in materials as they frequently show advanced features as compared to their complement polymer micro-composites. In this study, Thermoplastic polyurethane (TPU) is used as matrix and Antimony trioxide (primary flame retardant) and Montmorillonite organo-clay (secondary flame retardant) along with Benzoflex (plasticizer) are used as fillers. Nanocomposites of varying composition (TPU-1 to TPU-6) are prepared via melt-mixing method. Samples are compressed to form sheets of desired dimensions through compression molding hydraulic press machine. Fourier transform infrared (FTIR) was applied for functional groups analysis. Scanning electron microscopy (SEM) was performed to examine the dispersion of fillers in the Nanocomposites. Differential scanning calorimetry (DCS) was also performed for evaluation of properties such as melting temperature and glass transition temperature. Tensile test was performed through Universal testing machine (UTM) which showed that Young’s Modulus mproved from 147.348 MPa for neat sample (TPU-1) to 244.568 MPa for TPU-6. UL-94 test was executed to observe flame retardance. Sample of interest (TPU-6) achieved V-0 classification in UL-94. All these results confirmed the synergistic effect of primary and secondary flame retardants. Optimum increase in flame performance and mechanical strength was observed for TPU-6.
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    Green Synthesis of Silver Nanocomposites from Powders of Various Medicinal Plants and Study of their Antimicrobial Potential
    (Library Information Services COMSATS University Islamabad Lahore Campus, 2020-02-17) Hira Ashfaq; FA18-R06-003; Dr. Lubna Sherin; LHR TP 5960
    The application of plant waste materials in the synthesis of nanomaterials is an efficient and inexpensive method to minimize the practice of expensive chemicals. It is because of the reason that it gives rise to green approaches that abstain from the addition of toxic chemicals into the environment. The research work focuses on the synthesis of silver nanocomposites using powders of various therapeutically reported plants and the study of their potential regdaring chromium metal decontamination. For characterization, the techniques of X-ray Diffraction XRD and Fourier Transform Infrared Spectroscopy FT-IR has been used. Waste water treatment is performed for adsorptiove removal of chromium. Optimization is carried out using batch methods for various parameters like, pH, adsorbent dose and time of contact. Isothermal and kinetics study have shown that removal of chromium using silver nanocomposite was a feasible process, following langmuir adsorption model and pseudo second order reaction kinetics.