A Green Metal–Organic Framework-Cyclodextrin MOF: A Novel Multifunctional Material Based Triboelectric Nanogenerator for Highly Efficient Mechanical Energy Harvesting

The naturally available cyclodextrin has opened up a wide range of research avenues because of its superior characteristics such as being non-toxic, biocompatible, and edible. The cyclodextrin is the green multifunctional material that can add to the triboelectric series and extend its self-powered applications. The ultrasonic synthesized cyclodextrin metal–organic framework (CD-MOF) designed using sodium as a metal ion and cyclodextrin as a ligand for the triboelectric nanogenerator is reported. The various detailed characterizations of the CD-MOFs give an insight into the properties of the synthesized material. The Kelvin probe force microscopy suggests three types of CD-MOFs, exhibiting a positive potential. As per the surface potential, the output of the various CD-MOF based TENG is varied as alpha CD MOF/Teflon > gamma CD-MOF/Teflon > beta CD-MOF/Teflon. The alpha CD MOF/Teflon TENG produces an electrical output of 152 V, 1.2 μA, and 14.3 nC, respectively. The fabricated device output is utilized for powering numerous low-power electronics through a capacitor and bridge rectifier circuit. The multiunit Z-shaped TENG device is attached to various surfaces such as the shoe heel and the backside of the school bag, and the corresponding energy harvesting response is demonstrated.     

Experimental investigation on effects of dielectric mediums in near-dry electric discharge machining

Journal of Mechanical Science and Technology - A dielectric fluid plays a significant role on the machining efficiency of Electric discharge machining (EDM). Two phase (liquid-air) dielectric...     

Analysis for preliminary design of a class of torsionally coupled buildings with horizontal setbacks

Simplified method of analysis of a special class of torsionally coupled buildings with horizontal setbacks is developed that can be executed with a plane frame analysis by means of a personal computer. Since most buildings may not exactly satisfy all the classification criteria, it is shown that an averaging technique may be used in such cases up to a certain limit. Perturbation analysis is carried out in determining such a limit, and numerical examples are presented to validate this. As a whole, the proposed simplified analysis may be used as a convenient and offhand tool at the preliminary stage of design.     

Combined effects of milling and calcination methods on the characteristics of nanocrystalline barium titanate

Barium titanate (BT) nanoparticles were synthesized by high-energy planetary milling technique. Wet milling and dry milling effects were compared. The milled powders were calcined at 1000 °C by microwave and conventional heating methodologies. The calcined powders were characterized by XRD, VP-SEM, EDX, BET, TGA and laser Raman spectroscopy techniques. Dry milled and microwave calcined BT showed the highest extent of tetragonality value of 1.021. VP-SEM micrograph confirmed the tetragonal morphology of microwave calcined BT(s) with an average grain size of 81 nm. Raman Spectra corroborated well with the XRD results. Wet milled and microwave calcined powders showed relatively higher residual hydroxyl ion contamination than that of the dry milled powders. Dry milled and microwave calcined powders showed superior room temperature dielectric constant value with relatively lower dielectric loss tangent value which are very much essential for the fabrication of multi layered ceramic capacitors.