Iranian Nanotechnology SocietyInternational Journal of Nanoscience and Nanotechnology1735-700421320250930Magnetohydrodynamic Flow and Heat Transfer Enhancement with Al2O3-Cu Hybrid Ionanofluids over an Exponentially Stretching/Shrinking Permeable Sheet with Heat Generation and Slip Effects12313673862210.22034/ijnn.2025.2066935.2685ENAbantiDattaDepartment of Mechanical Engineering, Institute of Engineering and Management, School of University of Engineering and Management (UEM), Kolkata, Saltlake Sector V, Kolkata – 700 091, India0000-0001-9023-967XArkaBanerjeeDepartment of Mechanical Engineering, Dr. B. C. Roy Engineering College, Durgapur- 713206, India0000-0001-9329-4033SayantanMukherjeeDepartment of Mechanical Engineering, Gandhi Academy of Technology and Engineering, Brahmapur, Odisha,761008, India0000-0003-4896-0329Journal Article20250725Efficient heat transfer fluids are pivotal for high-performance thermal management systems. Although Conventional nanofluids exhibit improved thermal properties, their practical applications are often hindered by agglomeration and flow instability. To overcome these challenges, this study investigates a hybrid ionanofluid, comprising Al2O3 and Cu nanoparticles dispersed in a water–[C2mim] [CH3SO3] ionic liquid mixture under magnetohydrodynamic (MHD) boundary-layer (BL) flow conditions. The study focuses on analyzing how magnetic field strength, heat generation, suction, velocity and thermal slip influence the flow and heat transfer characteristics over an exponentially stretching or shrinking permeable surface. The governing partial differential equations are transformed via similarity variables and solved numerically using MATLAB’s bvp4c solver. A linear stability analysis is further performed to distinguish the physically realizable solution branch in cases of dual solutions. The results demonstrate that the hybrid ionanofluid substantially enhances both skin friction and heat transfer rates compared to conventional hybrid nanofluids, due to the combined effects of ionic liquid properties and nanoparticle synergy. Quantitatively, increasing Cu fraction (from 0.001 to 0.01) raises the local Nusselt number by ~1.7% and skin-friction coefficient by ~2.7%, while delaying bifurcation onset by ~5.4% and lowering suction threshold by ~2.3%. The findings highlight the superior heat transfer capability of hybrid ionanofluids and establish their potential as next-generation working fluids in advanced thermal systems.https://www.ijnnonline.net/article_738622_e889dec6c5649940a6c8f1d0a1adc063.pdfIranian Nanotechnology SocietyInternational Journal of Nanoscience and Nanotechnology1735-700421320250930Solvothermal Synthesis and Characterization of CsPbI3, CsSnI3 and CsPb1-xSnxI3 Perovskite Nanocrystals13714873862810.22034/ijnn.2026.2068417.2695ENHari GaneshaYDepartment of Studies in Physics, Mangalore University, Mangalagangothri – 574 199, India0009-0005-6548-5381Ramaraja VarmaVMicrotron Centre, Department of Studies in Physics, Mangalore University, Mangalagangothri – 574 199, India0000-0002-4946-5787Gopalakrishna NaikKDepartment of Studies in Physics, Mangalore University, Mangalagangothri – 574 199, India0000-0002-9212-4320Journal Article20250811The solvothermal method synthesized CsPbI3, CsSnI3, and CsPb1-xSnxI3 perovskite nanoparticles. The powder X-ray diffraction (XRD) patterns of the synthesized CsPbI3 and CsSnI3 were found to be -CsPbI3 and black -CsSnI3 perovskite phases, respectively. The nanoparticles synthesized from equal molar masses of Pb and Sn indicate the formation of -CsPbI3, black -CsPbI3, and black -CsSnI3 perovskite phases instead of the formation of the intended quaternary CsPb0.5Sn0.5I3 solid solution. The field emission scanning electron microscopy (FESEM) images show the formation of nanorods for CsPbI3, nanorods and nanoplatelets for CsSnI3, and nanorods/nanowires and nanoplatelets for the intended CsPb0.5Sn0.5I3 nanostructures. The Fourier transform infrared (FTIR) spectra of the synthesized samples show the presence of the oleic acid surfactant in the synthesized nanostructures. The estimated band gaps of the synthesized -CsPbI3 and B--CsSnI3 nanostructures from the UV-visible optical absorption measurements were found to be slightly higher than the reported bulk band gap values of these materials, which may be due to the quantum confinement effect. The exciton-related absorptions were observed both in -CsPbI3 and B--CsSnI3 nanostructures. The band gaps of both -CsPbI3 and B--CsSnI3 nanostructures were found to show a blue shift with aging of the nanostructures, which may be due to the predominance of the band-to-band absorption over the excitonic absorption with aging of the nanostructures. The synthesized nanostructures appear to exhibit long-term structural stability, as confirmed by the observation of stable XRD patterns and UV-visible optical absorption spectra of the synthesized samples, which were maintained for four to six months after synthesishttps://www.ijnnonline.net/article_738628_e880dcdb1759697230b8ade78c5a4980.pdfIranian Nanotechnology SocietyInternational Journal of Nanoscience and Nanotechnology1735-700421320250930Novel Method for Synthesis of Janus MXene Nanosheets by Masking Starch14915673869910.22034/ijnn.2026.2066281.2683ENFatemehHelmiTransport Phenomena & Nanotech. Lab (TPNT), School of Chemical Engineering, College of Engineering, University of TehranMahdiehYavariTransport Phenomena & Nanotech. Lab (TPNT), School of Chemical Engineering, College of Engineering, University of Tehran0000-0001-5507-4881EsmailYaghoubi-AzbariTransport Phenomena & Nanotech. Lab (TPNT), School of Chemical Engineering, College of Engineering, University of TehranMahdiAkbariTransport Phenomena & Nanotech. Lab (TPNT), School of Chemical Engineering, College of Engineering, University of TehranMojtabaShariaty-NiassarTransport Phenomena & Nanotech. Lab (TPNT), School of Chemical Engineering, College of Engineering, University of Tehran0000-0002-4477-8397Journal Article20250719MXene represents a highly promising class of two-dimensional materials characterized by its layered structure; however, the interlayer van der Waals forces result in aggregation of these NPs and limit their application . To address this challenge and enhancing their stability and applicability, strategies such as composite formation and surface modification are utilized. Notably, the transformation of MXenes into Janus structures has emerged as an effective strategy for improving functionality. Janus MXene nanosheets were synthesized via the Pickering emulsion method. In this method, one side of the MXene was masked with tapioca starch microspheres. Afterward, MXene was functionalized with dodecylamine (DDA), a hydrophobic agent. Subsequently, through thermal cycling (heat and sonication), the starch template was removed from the MXene surface. Then, Janus MXene nanosheets with an asymmetric structure are achieved. This study introduces a novel and cost-effective method for synthesizing hydrophilic/hydrophobic Janus MXene nanosheets. FTIR, Raman, XRD, and FESEM analyses collectively confirm the amphiphilic behavior and the two-dimensional structure of the synthesized Janus MXene nanosheets. This synthesis method is suitable and economical for Janus MXene production.https://www.ijnnonline.net/article_738699_a69b664638d3e418ca43b687678c723b.pdfIranian Nanotechnology SocietyInternational Journal of Nanoscience and Nanotechnology1735-700421320250930Enhancement of Physicochemical, Thermal and Antibacterial Properties of Chitosan/PVA Films by Eggshell-Derived CaO Nanoparticles15716773878010.22034/ijnn.2026.2067682.2688ENMariaLinsha P.LDepartment of Chemistry, St. Teresa’s College (Autonomous), ErnakulamMariyamThomasDepartment of Physics, St. Teresa’s College (Autonomous), ErnakulamJaya T.VarkeyDepartment of Chemistry, St. Teresa’s College (Autonomous), ErnakulamJournal Article20250804Calcium oxide (CaO) nanoparticles were prepared using domestic eggshell waste through thermal calcination and added to chitosan/polyvinyl alcohol (CS/PVA) composite films to improve their physicochemical and antibacterial properties. CS, CS/PVA, and CS/PVA/CaO formulations were synthesized and evaluated using viscosity measurements, FTIR, XRD, SEM, and antibacterial activity against Escherichia coli. FTIR and XRD indicated the presence of crystalline CaO with traces of residual carbonate, while SEM analysis indicated dramatic morphological improvements, especially enhanced porosity and surface roughness upon CaO addition. Viscosity determinations indicated concentration-dependent growth, with CS/PVA and CS/PVA/CaO solutions having lower viscosities than neat chitosan, suggesting enhanced chain mobility and processability. TGA analysis proved enhanced thermal stability in the CS/PVA/CaO films against CS and CS/PVA films, proving the reinforcing effect of CaO nanoparticles in the polymer matrix. Antibacterial analysis proved that the CS/PVA sample had the largest inhibition zone compared to CS and CS/PVA/CaO, indicating a synergistic effect between CS and PVA, while the introduction of CaO reduced antibacterial activity slightly, likely because of nanoparticle aggregation. In all, this paper points to a green process to transform biowaste into functional nanomaterials and secures a structure–property–function relationship in CS-based antimicrobial films, opening doors to the possibility of their application in biomedical, environmental and packaging fields.https://www.ijnnonline.net/article_738780_ed8c6fb8124478d40598c97821a27d92.pdfIranian Nanotechnology SocietyInternational Journal of Nanoscience and Nanotechnology1735-700421320250930CNTFET-Based Analog and Digital Circuits: Design, Simulation and Comparative Analysis16917473882110.22034/ijnn.2026.2065387.2677ENRobertoMaraniInstitute of Intelligent Industrial Technologies and Systems for Advanced
Manufacturing (STIIMA), National Research Council of Italy.Anna GinaPerriDepartment of Electrical and Information Engineering
Polytechnic University of Bari
Via E. Orabona, 4, 70125 Bari, Italy0000-0003-4949-987XJournal Article20250709In this paper we propose a procedure that allows a comparative analysis of A/D circuits in CNTFET and MOS technology.<br>For the first technology we use a CNTFET model, already proposed by us and briefly recalled, while for the second one we use the BSIM4 model of the Advanced Design System (ADS) library.<br>As example of analog circuit, we consider the design of a basic current mirror, for which parameters of merit, such as relative error in reference current replication and small-signal output resistance, are evaluated in order to show the differences between the two considered technologies. <br>As example of digital circuits, we consider a NAND gate at different supply voltages and frequencies, for both technologies. All simulations are performed using the software Advanced Design System (ADS) which is compatible with the Verilog A programming language.https://www.ijnnonline.net/article_738821_3894367c545ad7ec89afeeb2c102bb95.pdfIranian Nanotechnology SocietyInternational Journal of Nanoscience and Nanotechnology1735-700421320250930Fabrication and Characterization of Doped and Coupled Graphitic Carbon Nitride-Based Nanostructures with Enhanced Optical and Electronic Properties17517973882210.22034/ijnn.2025.2055216.2640ENZahraSoleimaniDepartment of Nanotechnology, Graduate University of Advanced Technology, Kerman, IranFaribaFathiradDepartment of Nanotechnology, Graduate University of Advanced Technology, Kerman, IranMansourehBehzadiDepartment of Mining Engineering, High Education Complex of Zarand, Shahid Bahonar University of Kerman, Kerman, IranJournal Article20250310In this study, graphitic carbon nitride (g-C₃N₄) nanosheets were successfully synthesized and systematically modified through nitrogen and sulfur doping, as well as heterojunction coupling with bismuth vanadate (BiVO₄) and manganese-doped BiVO₄ (Mn-BiVO₄), to enhance their physicochemical and optoelectronic properties. A series of nanocomposites—including g-C₃N₄/BiVO₄, S-g-C₃N₄/BiVO₄, N-g-C₃N₄/BiVO₄, S-g-C₃N₄/Mn-BiVO₄, and N-g-C₃N₄/Mn-BiVO₄—were fabricated via controlled hydrothermal and coupling strategies. Comprehensive structural and morphological characterizations were performed using field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD). The effects of doping and heterojunction formation on the optical band gap and light absorption capability were assessed using UV-Vis diffuse reflectance spectroscopy (DRS). The results confirmed that both elemental doping and heterostructure formation induced favorable modifications in the crystal structure and band alignment, thereby enhancing visible-light absorption and reducing the energy band gap. These findings demonstrate the potential of the designed nanostructures as efficient photocatalytic platforms for sustainable energy and environmental applications.https://www.ijnnonline.net/article_738822_1dd1a1ae3821685dce26de99a73f0a66.pdf