National Institute of Lasers & Optronics
Recent publications
High-performance nanoscale supercapacitor (SC) electrode materials of polyaniline (PANI) and polyaniline cadmium oxide (PANI-CdO) composites are fabricated using In-situ chemical polymerization route. The structural parameters, crystallite size, and lattice strain of the prepared samples are estimated by X-ray diffraction analysis. The CdO stretching peak in PANI-CdO nanocomposite's FTIR spectra confirms the interaction of CdO with PANI. SEM analysis exposing a random dispersion of CdO nanoparticles in PANI matrix and showing the cluster of indefinitely shaped fibrous flaky architectures. The cyclic voltammetry (CV) results show a higher specific capacitance of 866 F g⁻¹ for PANI-5%CdO composite as compared to Pure PANI 222 F g⁻¹ and Pristine CdO 35.2 F g⁻¹ at 5 mV s⁻¹ scan rate. Galvanostatic charge-discharge (GCD) results also show a higher specific capacitance value of 906.8 F g⁻¹ for PANI-5%CdO composite at 9.26 A g⁻¹ current density revealing a maximum energy density and power density of 9.04 Wh kg⁻¹ and 1510 W kg⁻¹ respectively. The frequency response behavior of PANI-CdO nanocomposites (EIS spectra) reveals (Warburg) diffusive resistance of the electrolyte into the interior of the electrode and ion diffusion into the electrode surface. The higher capacitance and lower ESR (equivalent series resistance) value of PANI-CdO nanocomposite refer to the formation of a more ordered structure and rapid ion diffusion that can develop enhanced surface-dependent electrochemical properties and recommend this material to be a promising potential candidate for practical supercapacitor electrode preparation.
In this research work, we have prepared nanocomposites of copper sulfide (CuS) nanoparticles (NPs) with titanium dioxide (TiO2) nanoflakes, with varying contents of CuS, via combined chemical precipitation and sol-gel methods. The effects of CuS concentration on the structural, morphological and electrochemical properties of TiO2/CuS nanocomposites for hybrid asymmetric Faradaic supercapacitors was studied for the first time. Electrochemical studies were carried out by using CV, CD, and EIS measurements in a three/two-electrode setups for both capacitive and practical aspects. When serving as an electrode material for the supercapacitors in three-electrode measurements, all the samples demonstrated a capacitive nature with a Faradaic charge storage mechanism due to the prominent redox peaks originating from their CV and voltage plateau in the CD profile. The optimized electrode ST-3 revealed the highest energy storage performance (capacitance: 853 F g−1) with low charge transfer and solution resistance compared with other electrodes (CuS: 440 F g−1, TiO2: 326 F g−1, ST-1: 535 F g−1, ST-5: 672 F g−1) at 1 Ag−1 with the superior rate capability. The ST-3//AC//KOH ASC displayed a high capacitance of 226.5 F g−1 and 80.2 F g−1 at the discharge current was prolonged from 1 to 5 A g−1 after an optimized voltage of 1.8 V in a two-electrode setup. Interestingly, an outstanding energy density of 68.4 W h kg−1 was achieved at a high-power density of 8150 W kg−1 at a discharge current of 1 and 5 A g−1, with the descent durability of 87 % at a high discharge current of 6 A g−1 when recycled for a large number of 25,000 cycles. These outstanding features highlight an appealing, low-cost, simple, and green route to synthesize other transition metal sulfides for the next-generation electronic devices.
Owing to the potential health threats due to sustained exposure from the radioactivity born radon and thoron gases and their applications, especially radon as earthquake precursor, the complex dynamic relationship between either of the radioactive gas with meteorological parameters has become the focus of research area. Several studies have reported that meteorological factors greatly influence the radon and thoron radioactive gases. In present study we investigated the scaling behavior of cross-correlations between simultaneously observed Radon and Thoron time series with temperature, pressure, and humidity time series. Data for radon, thoron and other meteorological parameters were obtained using RTM 1688-2 active detector from March 2017 to April 2018, with the total number of data points in each time series greater then fifteen thousands. Data obtained was investigated by Multi-fractal Detrended Cross-correlation Analysis (MFDXA) method through detrended covariance function. The computed cross-correlations were also investigated for multifractal or monofractal nature as well as for the degree of multifractality. Results of the study show that all correlations exhibit long range power law behavior. A nonlinear variation of scaling exponent vs ‘q’ (order of fluctuation) shows multifractal nature of cross-correlations with > 0.5 for all correlations. Which means that all correlations are persistently positive correlated. The degree of multifractality was estimated by the width of singularity spectrum . The results show that for each of the correlations width of singularity spectrum is nonzero confirming the multifractal nature of computed correlations. Finally, for Radon/Thoron correlation with temperature and humidity the width of singularity spectrum i.e., > 0.5 shows high multifractality when compared with Radon/Thoron vs pressure correlation with < 0.5 showing low multifractality.
In the current study, the application of fluorescence spectroscopy along with the advanced statistical technique and confocal microscopy was investigated for the early detection of stripe rust infection in wheat grown under field conditions. The indigenously developed Fluorosensor fitted with LED, emitting monochromatic light was used that covered comparatively larger leaf area for recording fluorescence data thus presenting more reliable current status of the leaf. The examined leaf samples covered the entire range of stripe rust disease infection from no visible symptoms to the complete disease prevalence. The molecular changes were also assessed in the leaves as the disease progresses. The emission spectra mainly produce two fluorescence emission classes, namely the blue-green fluorescence (400–600 nm range) and chlorophyll fluorescence (650–800 nm range). The chlorophyll fluorescence region showed lower chlorophyll bands both at 685 and 735 nm in the asymptomatic (early diseased) and symptomatic (diseased) leaf samples than the healthy ones as a result of partial deactivation of PSII reaction centers. The 735 nm chlorophyll fluorescence band was either slight or completely absent in the leaf samples with lower to higher disease incidence and thus differentiate between the healthy and the infected leaf samples. The Hydroxycinnamic acids (caffeic and sinapic acids) showed decreasing trend, whereas the ferulic acid increased with the rise in disease infection. Peak broadening/shifting has been observed in case of ferulic acid and carotenes/carotenoids, with the increase in the disease intensity. While using the LEDs (365 nm), the peak broadening and the decline in the chlorophyll fluorescence bands could be used for the early prediction of stripe rust disease in wheat crop. The PLSR statistical techniques discriminated well between the healthy and the diseased samples, thus showed promise in early disease detection. Confocal microscopy confirmed the early prevalence of stripe rust disease infection in a susceptible variety at a stage when the disease is not detectable visually. It is inferred that fluorescence emission spectroscopy along with the chemometrics aided in the effective and timely diagnosis of plant diseases and the detected signatures provide the basis for remote sensing.Graphical abstract
Hexanary high-entropy oxides (HEOs) were synthesized through the mechanochemical sol-gel method for electrocatalytic water oxidation reaction (WOR). As-synthesized catalysts were subjected to characterization, including X-ray diffraction (XRD), Fourier transforms infrared (FTIR) analysis, and scanning electron microscopy (SEM). All the oxide systems exhibited sharp diffraction peaks in XRD patterns indicating the defined crystal structure. Strong absorption between 400–700 cm−1 in FTIR indicated the formation of metal-oxide bonds in all HEO systems. WOR was investigated via cyclic voltammetry using HEOs as electrode platforms, 1M KOH as the basic medium, and 1M methanol (CH3OH) as the facilitator. Voltammetric profiles for both equiatomic (EHEOs) and non-equiatomic (NEHEOs) were investigated, and NEHEOs exhibited the maximum current output for WOR. Moreover, methanol addition improved the current profiles, thus leading to the electrode utility in direct methanol fuel cells as a sequential increase in methanol concentration from 1M to 2M enhanced the OER current density from 61.4 to 94.3 mA cm−2 using NEHEO. The NEHEOs comprising a greater percentage of Al, ([Al0.35(Mg, Fe, Cu, Ni, Co)0.65]3O4) displayed high WOR catalytic performance with the maximum diffusion coefficient, D° (10.90 cm2 s−1) and heterogeneous rate constant, k° (7.98 cm s−1) values. These primary findings from the EC processes for WOR provide the foundation for their applications in high-energy devices. Conclusively, HEOs are proven as novel and efficient catalytic platforms for electrochemical water oxidation.
Ferrite materials have found applications in numerous areas, chiefly for hyperthermia in cancer therapy, targeted drug delivery and photodegradation. In this work, magnesium ferrite nanoparticles (MgFNPs) were formulated using polyethylene glycol (PEG) as a capping agent to tailor the properties and heighten the biocompatibility for suitable biomedical applications. The characterization results clearly showed the effect of PEG tailoring the properties of the formulated MgFNPs. A crystallite size with a value between 16 and 91 nm was determined from the X-ray diffraction (XRD) analysis. The scanning electron microscopy (SEM) analysis showed particles of spherical shape for all the samples and the particle size was enhanced as the concentration of PEG increased. The vibrating sample magnetometer (VSM) showed a ferromagnetic nature for the samples with reduced saturation magnetization as the concentration of PEG was increased. The PEG concentration heightened the properties of the sample and can be highly optimized for suitable biomed-ical applications. ARTICLE HISTORY
The key to energy conversion and storage for supercapacitors is the development of easy-to-prepare electrode materials with high capacity performance. We have synthesized a series of nanocomposites based on copper oxide (CuO) and titanium dioxide (TiO2), symbolized as CuO/TiO2 with varying wt% Firstly, the current research uses a low-cost wet chemical method for high-performance asymmetric supercapacitor (ASC) ratios of CuO. Nanocomposites formation and morphological evaluations were confirmed via a series of characterization techniques, e.g., SEM, XRD, Raman, and XPS certified the highly crystalline nature and purity of the samples. The electrochemical properties were tested using the conventional three and two-electrode system that exhibited an excellent energy storage performance even at a low current of 1 A g⁻¹. The TiO2-30 % CuO electrode had a greater specific capacitance of 553 F g⁻¹ than pure CuO (226 F g⁻¹) and TiO2 (115 F g⁻¹) at the constant discharge current density of 1 A g⁻¹. Moreover, an ASC was assembled by utilizing a TiO2-30 % CuO electrode and activated carbon (AC) as positive and negative electrodes respectively. The TiO2-30 % CuO//AC ASC delivered a high energy density of 34 Wh kg⁻¹ at 800 W kg⁻¹ and retained 18 Wh kg⁻¹ when the specific power increased to 4800 W kg⁻¹ at 1 A g⁻¹. Our ASC exhibited excellent stability of 96 % retention after 10,000 cycles with superb rate capability at a wide voltage frame of 1.6 V. According to density functional theory calculations, CuO/TiO2 improved the material's electrical conductivity and electrochemical performance. The data suggested that the CuO/TiO2 nanocomposites, with optimum concentration of CuO, could be used as a good supercapacitor electrode material in the future.
A simple hydrothermal technique was applied to synthesize ZnO@ZnS nanocomposite for hybrid supercapacitors (SCs). As an electrode for SCs, ZnO@ZnS revealed good reversibility, a capacitance of 440.6 F/g, and low charge transfer resistance in an aqueous solution. A hybrid SC was further developed, which delivers a high energy density of 31 Wh kg−1, a power density of 4520 W kg−1, and supreme stability of 94.7 % till 5500 repeated charge–discharge cycles. These exciting findings demonstrate that ZnO-based functional materials might be an excellent option for high-performance hybrid SCs.
The aim of this research is to study the principal degradation mechanisms in Polydimethylsiloxane (PDMS) gaskets exposed in research reactor environment. For this purpose, locally available PDMS gaskets samples were purchased and labelled as G-1, G-2 and G-3. Characterization of samples was done by employing various analytical techniques such as X-ray Diffraction spectroscopy (XRD), Fourier Transform Infrared spectroscopy (FTIR), Thermo-gravimetric analysis–Differential Scanning Calorimetry (TGA–DSC), mechanical testing, Optical/Scanning Electron Microscopy/Energy-dispersive spectroscopy (SEM/EDX) analyses and chloroform immersion test. The results revealed that G-1 sample showed better thermal, mechanical and chemical properties due to homogenized blend of silica particles with PDMS polymeric structure. The qualified gasket sample (G-1) was fixed in stainless steel flanges and irradiated (neutrons, gamma) in pool of Pakistan Atomic Research Reactor (PARR-1). On monthly basis inspection, it was observed that G-1 sample deteriorated in numerous pieces after receiving an accumulated dose of ~ 16.5 KGy during 5.5 years. The irradiated sample was characterized and results revealed that PDMS chains degraded by yielding free radicals (H. and CH3.) and silicon-based cyclic compounds (C6H18O3Si3) as by-products. Furthermore, dispersed silica particles leached out and left behind pores in main matrix which also weaken the polymeric chain structure. The propagation of crack branches along the weak regions of polymeric matrix was also observed in SEM analysis. From this investigation, it was inferred that scissioning mechanism was dominant over crosslinking in PDMS gasket during their degradation in research reactor environment.
Droplet-based microfluidic reactors are promising platforms for the synthesis of nanoparticles having several potential applications. This study reports the synthesis of long-term stable silver nanoparticles (AgNPs) using a segmented flow polymethyl methacrylate (PMMA)-based microfluidic platform for the first time. The polymeric stabilizers, polyvinyl alcohol (PVA) and polyvinylpyrrolidone (PVP), were used to stabilize the AgNPs suspensions over a long period of time at room temperature. These particles were characterized using ultraviolet–visible (UV–Vis) spectroscopy, field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray (EDX) and X-ray diffraction (XRD) analysis. The stability analysis of colloidal suspensions of AgNPs was accessed using UV–Vis spectroscopy for a period of 6 months. PVA was found to be comparatively the more effective stabilizer for AgNPs. The average size distribution of AgNPs stabilized with PVA was found to be 16.8 ± 1.8 nm using scanning electron microscopy. These suspensions were then stored for a period of 36 months and observed to remain stable with an increase in the size up to 41.7 ± 7 nm. PVA-stabilized AgNPs were assessed against 4T1 breast cancer cells and were observed to hinder the growth of breast cancer cells at a very low dose of 20 µg/mL with 87% (p = 0.0042) efficacy. These AgNPs showed significant antibacterial activity against Neisseria gonorrhoeae, Staphylococcus aureus and Micrococci luteus. The maximum zone of inhibition obtained was 18 mm against Staphylococcus aureus at a very low concentration of 20 µg/mL. These outcomes indicate that the proposed microfluidic reactor provides a robust approach for the preparation of highly stable AgNPs in combination with PVA as stabilizer which has also shown great potential in antibacterial and anticancer treatments.
The water contamination is a major concern. To address this challenge, facile remediation methods are required. In this connection, outstanding properties and chemical composition of nanomaterials can play an important role. In this study, bismuth molybdenum oxide (Bi4MoO9) nanoparticles were synthesized by a simple hydrothermal method to explore their properties as a photocatalyst and electrocatalyst. The prepared nanoparticles were characterized with zeta sizer, scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and fourier transform infrared spectroscopy. The photocatalytic degradation has been studied against industrial dyes i.e., crystal violet (CV) and methyl orange (MO). The result indicated that Bi4MoO9 nanoparticles showed agglomerated morphology with −15 mV surface potential. Nanoparticles carried photo-degradation up to 93.8% and 72% for CV and MO dyes, respectively. In addition to that, chemical oxygen demand (COD) was reduced up to 65% for crystal violet and 53.57% for MO dyes. In addition, electrocatalysis of nanoparticles was studied using cyclic voltammetry. The sensitivity of electrochemical assay for binding ascorbic acid by Bi4MoO9 nanoparticles was achieved as low as 0.02 mM (S/N = 3). The results of the current research provide a new insight to synthesize nanomaterials with interesting chemical composition and to explore the photocatalytic and electrocatalytic properties for multiple applications in environmental and biomedical fields.
Metal Organic framework (MOFs) a diverse class of complex organic metal assemblages has been attracting a great interest due to its easy tunability and modified characteristics during the past few years. These nanoscale-to-microscale-sized structures have been employed in different applicative fields due to their striking functional chemistry. Barium MOF synthesis is based on barium metal ions tri-linked organically to form a cubic structure and features photolumincity. Ba-MOF was synthesized by hydrothermal method and structural and optical analysis was performed using X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS), Raman Spectroscopy and Zeta Potential. The presence of cubic structure and organic carbon and oxygen linkages was indicated by XRD peaks. EDS directs the presence of barium as well as carbon and oxygen (organic linkers). Raman analysis paid for witnessing the evidence of the synthesis of MOF structure by validating the peak location. The photoluminescence spectrum was applied to measure the bandwidth to study the photoluminescence characteristics. The PL spectrum presented a wide bandwidth of 107.4 nm indicating Ba-MOF to be an efficient photoluminescent nanocomposite for photoluminescence-based applications. Zeta potential value of [Formula: see text] mV characterized anionic behavior and high stability of fabricated Ba-MOF.
The advancement of electrode-active materials opens up new possibilities for future energy storage systems. Compositing is a possible technique for making high-performance supercapacitors that can enhance the disadvantages of one electrode material over another. This paper reports a novel nanocomposite based on CuSe-TiO 2 for supercapacitors, thoroughly characterized for its morphological, structural, and spectroscopic techniques to ensure an in-depth understanding of the electrode material. The phase purity and crystal structure were confirmed from XRD, which shows the pure phase of the samples, while the SEM/TEM reflects the nanoflakes/ vertical sheets morphology of CuSe and TiO 2 in the composite. The oxidation states and surface chemistry were confirmed from the XPS spectrum, confirming Cu, Se, Ti, and O in the composite and supporting the XRD results. The electrochemical performance of CuSe-TiO 2 and CuSe are examined in detail, exhibiting a capacitance of (370 F g − 1 /225 at 1.5 A g − 1) with extraordinary rate performance in 1 M Na 2 SO 4 aqueous solution. Furthermore, an all-solid-state asymmetric supercapacitor is produced to show 70 F g − 1 , at 31.5 Wh kg − 1 and 4500 W kg − 1 energy, and power density coupled with robust cycling stability of 10,000 cycles. More importantly, the single asymmetric supercapacitor device had enough energy to light up a LED for 50 s, showing its practical applicability.
One-dimensional, elemental doped CdO nanofibers have emerged as marvelous fibrous materials for translation into energy harvesting devices technology, however very little is reported about these materials. This study describes the fabrication and characterization of Nix/(CdO)1-x doped nanofibers, with foremost emphasis on the dielectric properties for a range of Ni concentrations (0 ≤ x ≤ 15 wt%), produced by a dc-driven electrospinning technique. X-ray diffraction, energy dispersive spectroscopy, and fourier-transform infra-red spectroscopyprovide a strong signature on the crystalline cubic phase and formation of contamination free CdO nanofibers. Ni doping leads to altering the electrical, optical, and morphological characteristics of the nanofibers. The grain size and average diameter of the fibers were varied from 22 to 11 nm and 70–120 nm respectively while the spectral emission of the photon energies spanned over 1.7–1.2 eV. The impedance, dielectric properties, and conductivity were strongly affected by Ni doping with the smallest charge transfer resistance and the highest charge separation obtained for x = 15% Ni. A comprehensive analysis of metal doped Nix/(CdO)1-x electrospun nanofibers with tuneable characteristics will offer innovative strategies and opportunities for possible sustainable energy production, and creative solutions to biomedical, healthcare, sensor devices, and environmental problems.
ZnO is an appealing electrode material for improved supercapacitors due to its high capacitance, low cost, environmental friendliness, and strong electrochemical reversibility. We present the synthesis of a newly designed ZnO covered with ZnS and paired with CdS to produce a ternary heterostructure. The morphological research indicated that ZnO has an urchin-like form coated with ZnS and CdS nanoparticles on the surface with no undesired by-product residues, which enhances the surface functionalities. First, we combined ZnO and ZnS to make a binary nanocomposite that outperformed its bulk equivalent ZnO by 322 mAh g⁻¹ at 175 mAh g⁻¹ during the charge-discharge process when a low current flow of 1 A g⁻¹ was used. Following that, due to the synergistic effect of multiple components, a new class of ternary ZnO-ZnS-CdS heterostructure was developed, effectively improving the electrochemical properties, e.g., a capacity of 434 mAh g⁻¹, and charged transfer kinetics (over pristine ZnO, and ZnO-ZnS electrodes). Following that, ASC was evaluated further, revealing that it has the exceptional energy-storage performance of 36 Wh kg⁻¹, 5422 W kg⁻¹ after adding an optimal voltage (1.8 V) with large numbers of cycling that retain only ∼91% at a higher current response. Last but not least, compositing is a vital strategy to boost the overall capacitive performance of the nanomaterials.
Mixed Matrix Membranes (MMMs) with hybrid organic-inorganic characteristics offer a strong alternative to traditional polymer-based membranes to reduce the trade-off between gas permeability and selectivity. This work incorporated lanthanum-Metal Organic Frameworks in the Matrimid to fabricate MMMs. To understand the effects of nano-filler on membranes’ morphology, porosity, thermal stability, and chemical composition, MMMs were fabricated with three different loadings of nano-filler, i.e., 10, 20 and 30 wt%. The selectivity and permeability of CH4, CO2, and N2 gases through MMMs were investigated at 10 bar pressure and temperatures ranging from 25 to 55 °C. All MMMs exhibited enhanced CO2 permeation with increased nano-filler loading because the porous nano-filler provided additional channels and fractional free volume in the polymer matrix. 30 wt% loaded membrane showed a 183% increase in permeability of CO2 than neat membrane. With increasing nano-filler loading, the selectivity of MMMs increased from 34.1 to 48.45 for CO2/N2 and from 36.2 to 54.67 for CO2/CH4, confirming the absence of membrane defects, improved filler/polymer interface, and excellent dispersion of nano-filler in the polymer matrix. The results proved that these membranes could be further used for gas separation industrial applications.
The purpose of this research is to investigate the multi-area economic emission dispatch problem (MEEDP) in the presence of renewable energy resources (RES) to improve the energy sustainability and climatic benefits. MEEDP is a multi-objective problem in smart grids, with the purpose of minimizing the operating costs and emissions of thermal units. RES have made a substantial contribution to greenhouse gases emission control and environmental sustainability. The integration of RES into conventional grids which is becoming increasingly prevalent, spread the research scope of MEEDP and need to be re-examined. This work considers two renewable sources (wind and solar) along with thermal plants subjected to significant number of previously uncombined system level limitations such as power capacity limit, prohibited zones, transmission network losses, dynamic ramp limits, tie-line limits and multiple fueling options. The operating cost is computed as summation of predictive and stochastic components. The predictive part is calculated by utilization of cumulative distribution function for each wind and solar system. A swarm intelligence-based crow search optimization algorithm (CSOA) is modeled to handle the complex constrained MEEDP with adjusted predictive part of RES. Six benchmark test systems with multi-dimensional constraints have been chosen to validate the adaptability and efficacy of the presented approach. Regardless of the complexity of the problem, the proposed approach provides the best feasible solution with a finer convergence rate. Finally, the simulation results depict that the integration of the corresponding system constraints gives legitimacy to the system and delivers reliable output.
The present study portrays the synthesis of ZnO/MnO2-based nanocomposite with different weight percentages of MnO2 (10% and 40%, signifies as ZM-1 and ZM-4), and their morphological-dependent electrochemical performance has been demonstrated. The morphological study was explored using SEM analysis which showed that the ZnO and MnO2 reflected the nanorods/nanowires morphology. During the electrochemical study, the optimized ZM-4 nanostructures demonstrated a specific capacitance of (304/155.0) Fg⁻¹ at 1/3 Ag⁻¹, which is significantly higher than pure ZnO (160.6 Fg⁻¹), and MnO2(206.5 Fg⁻¹. Furthermore, the capacitance of the built hybrid supercapacitor reached 105.0 F g⁻¹ after the expansion of the voltage window to 1.6 V with decent cycling durability. More importantly, a 26 Wh kg⁻¹ energy density at 4790 Wkg⁻¹ power density was obtained, manifesting that ZnO/MnO2 is a highly appealing potential material for energy storage and conversion.
A nondestructive, noncontact approach for the estimation of elastic parameters of fully clamped thin sheet is presented in current work. Frequency response of pulsed laser impulse excited clamped thin plate is used for the estimation of elastic parameters. Elastic parameters like Young’s modulus, shear modulus and Poisson ratio of fully clamped thin square soda lime glass plate are determined by pulsed laser impulse excitation of vibrations. Initially, frequency response is recorded by measuring vibrations using quadrature Michelson interferometer. Then, finite element method (FEM) based simulations are performed in ANSYS Workbench for the identification of mode shapes for transverse modes of vibrations. Experimentally measured natural frequencies are compared with the modes of vibrations from FEM for the determination of elastic parameters. Soda lime glass fixed in an Aluminum holder. The obtained values of parameters are in agreement with analytical calculations within 3% and Young’s modulus measured by three point bending method within 1.5%. Effect of holder on the modes of vibrations of glass is found to be less than 2%. Both simulations and experimental results are matched iteratively and extra bending and twisting modes of holder are identified. Best fitted elastic parameters for results are further verified using other methods. Due to the noncontact nature of the pulsed laser excitation and laser-based measurements, current technique can easily be applied for the measurement of Young’s modulus at in-situ harsh environments even at elevated temperatures.
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35 members
Abida Raza
  • NILOP Nanomedicines Research Laboratories (NNRL)
Zahid Ali
  • Materials
Hina Ali
  • Biophotonics
Manzoor Ikram
  • Optronics
Mushtaq Ahmed
  • Laser Spectroscopy, Laser Cooling, atomic Clock, Biophotonics, THz Spectroscopy, Semiconductor