A series of first-, second-, and third-generation dendronic triazolo-pyridazinones were synthesized in good yields via the Cu I -catalyzed azide-alkyne cycloaddition reactions of 4,6-diphenyl-2-(prop-2-yn-1-yl)pyridazin-3(2H)-one, possessing a terminal alkyne functional group with aromatic mono-and diazides with long alkyl and chiral glycol side-chain substituents. The chemical structures of the new compounds were characterized using different spectroscopic methods. The morphology of the dendrons was examined using the scanning electron microscope (SEM) analysis, which revealed the formation of highly ordered nanofiber and nanorod aggregations, directed by π-stacking interactions and van der Waals forces. Graphical abstractKeywords Dendron · Azide-alkyne cycloaddition · Self-assembly · Pyridazin-3(2H)-one · Nanofiber · Nanorod

The new nanocrystalline composition was synthesized using NiSO 4 and MoO 3 and PPDA (p-phenylenediamine) via the hydrothermal method. The structure, morphology and photoluminescence property of nanocrystal were studied using X-ray diffraction (XRD), Fourier transform infra red (FT-IR) spectroscopy, scanning electron microscopy (SEM), photoluminescence (PL) spectra, thermogravimetric analysis (TGA-DTA) and energy-dispersive X-ray spectroscopy (EDX). The effect of factors such as type and concentration of initial materials, pH values, temperature and reaction duration on the structure and morphology of nanocrystals was investigated in the preparation of composition. The results show that the pH of the initial solution affects the size of the prepared nanocrystals; the size of the crystals is increased and the morphology of the nanostructures is changed with the increment in pH value. According to the obtained results, neutral or low alkaline conditions of pH are more favorable for the formation of the nanocrystals. The obtained nanocrystal shows an intense PL emission at room temperature with a maximum peak at 461 nm and excitation at the wavelength of 300 nm. TGA and DTA analysis display a total weight loss of 13.42%.

The thin film industry has been introduced with an invention of lead-based perovskite solar cells which eventually has gained a huge attention throughout the years. As the concern arises, this lead-based perovskite solar cells contributed towards both the environmental and human health issues due to the high level of toxicity. This then carve the paths into the research in finding suitable alternative for lead-free perovskite where tin and germanium are proposed as possible substitute, but the long-term durability and stability of both perovskites are still a challenge to be improved and maintained. In this study, tin and germanium-based solutions are fabricated individually with mixed cations of FA-MA; FAxMA1–xSnI3 and FAxMA1–xGeI3 in variations (1⩽ x ⩽0). The UV-Vis spectroscopy was analyzed in 400-1100nm range to measure the light intensity absorption of full encapsulated fabricated perovskite solar cells after 30 days of exposure to surrounding conditions and recorded highest peak of absorption at the wavelength of 400 nm and 550 nm for tin based and germanium-based perovskite respectively.

Amusing students by dropping a magnet through a metal pipe is a common activity in many classrooms. Students will be excited to see the slow movement of the magnet through the pipe due to the eddy current and its damping force. This activity can be performed to enhance their knowledge about the properties of magnet and metal pipes if we are able to get data from this experiment. This case study prepared by performing the magnet fall activity by incorporating ExpEYES17 data logger and extracted the information such as the magnetic flux, terminal velocity of the magnet in the pipe, dragging coefficient and conductivity of the metal pipe.

<p><span lang="EN-IN">The root extract of the locally available <em>Curcuma Aromatica Salisb. </em>was used with the ZnO precursors to study the effect of the <em>Curcuma Aromatica Salisb. </em> extract on the growth and optical absorption behaviour of the ZnO nanoparticles. ZnO nanoparticles were synthesized in various concentrations of<em> Curcuma Aromatica Salisb. </em>root extract. X-ray diffraction studies show that the prepared samples consist of nanocrystallites of having sizes in the range between 17 nm to 26 nm. The optical absorption studies reveal that the eco-dying on ZnO nanoparticles using <em>Curcuma Aromatica Salisb.</em> root extract has enhanced the optical absorption behaviour of ZnO to the visible region of the spectrum.</span></p>