[{"content":" Footnotes to a Mind # A growing archive of scientific and technical insights—curated from my weblog and beyond. This space is dedicated to ideas worth exploring, questions worth asking, and discoveries worth sharing. Whether you\u0026rsquo;re here to browse, learn, or dive deep, I hope these entries spark your curiosity and expand your perspective.\n","externalUrl":null,"permalink":"/resources/knowledge-base/","section":"Resources","summary":"A curated archive of scientific and technical insights, bringing together ideas worth exploring, questions worth asking, and discoveries worth sharing.","title":"Knowledge Base","type":"resources"},{"content":" Wearable biosensors incorporating nanocomposites: advancements, applications, and future directions # Wearable sensors have emerged as transformative tools, enabling real-time monitoring of human health and activities. Within this field, miniaturized and flexible devices have attracted significant attention due to their compact size, ease of use, and non-invasive operation. These sensors function by detecting biological activities and converting bio-signals such as electrophysiological, mechanical, and biochemical information into quantifiable data. Such data can be obtained through various sensing approaches, including the detection of electrolytes, ions, and gases. In many cases, wearable sensors are fabricated by integrating the sensing element into a polymer matrix, with nanomaterials playing a particularly important role in enhancing performance. Health monitoring remains the primary application area for these devices. Emerging technologies, including AI-assisted sensing and cloudbased data processing, are expected to drive future advancements, while also introducing challenges related to data privacy. Looking ahead, key areas of development for nanomaterial-based wearable sensors include non-contact monitoring, textile-integrated devices, and improvements in security and regulatory frameworks.\nSource\n","externalUrl":null,"permalink":"/resources/projects/wearable-biosensors/","section":"Resources","summary":"This review explores how nanocomposites enhance flexible and miniaturized wearable biosensors for real-time monitoring of electrophysiological, mechanical, and biochemical signals. It also examines emerging directions such as AI-assisted sensing, cloud-based data processing, non-contact monitoring, textile-integrated devices, and the associated challenges of privacy, security, and regulation.","title":"Wearable biosensors incorporating nanocomposites: advancements, applications, and future directions","type":"resources"},{"content":"Hyperfine interaction is a quantum mechanical phenomenon that arises from the interplay between the magnetic moment of an atomic nucleus and the magnetic field generated by surrounding electrons. Though subtle in magnitude, this interaction plays a pivotal role in fields such as spectroscopy, atomic physics, and quantum information science.\nLet’s break it down:\nHyperfine interaction 1. Definition # Hyperfine interaction refers to the coupling between the nuclear magnetic moment and the magnetic field produced by electrons in an atom or molecule.\n2. Origin # It stems from the interaction between the nuclear spin (I) and the total angular momentum of the electrons (J), leading to a fine-tuned energy landscape.\n3. Energy Level Effects # This interaction causes small shifts and splittings in atomic and molecular energy levels—typically much smaller than those caused by fine structure effects.\n4. Spectroscopic Significance # Hyperfine structure is detectable in high-resolution spectroscopy. It leads to the splitting of spectral lines into multiple components, revealing deeper insights into atomic and molecular behavior. 5. Key Applications # Atomic clocks: The hyperfine transition in cesium-133 defines the SI unit of time—the second. NMR spectroscopy: Used to probe molecular environments. EPR spectroscopy: Explores unpaired electron systems. Mössbauer spectroscopy: Investigates nuclear transitions in solids. 6. Quantum Information Science # Hyperfine interactions are essential in certain quantum computing platforms, such as nitrogen-vacancy (NV) centers in diamond, where they enable precise control of quantum states.\n7. Mathematical Framework # The hyperfine Hamiltonian is commonly expressed as:\n\\( H = A.I.J \\)\nWhere:\n\\(A\\) is the hyperfine coupling constant \\(I\\) is the nuclear spin operator \\(J\\) is the total electronic angular momentum operator 8. Factors Influencing Strength # Magnitude of the nuclear magnetic moment Electron density near the nucleus Orbital angular momentum of the electrons 9. Types of Hyperfine Interaction # Fermi Contact Interaction: Occurs when s-orbital electrons have a non-zero probability of being at the nucleus. Magnetic Dipolar Interaction: Arises from the interaction between the nuclear magnetic moment and the magnetic field of electrons in non-s orbitals. Why It Matters # Understanding hyperfine interactions is essential for interpreting high-resolution spectra and designing advanced quantum devices. It offers a window into the electronic structure of atoms and molecules, and reveals the subtle magnetic environment surrounding nuclei—especially in solid-state systems.\nSource\n","externalUrl":null,"permalink":"/resources/knowledge-base/hyperfine-interaction/","section":"Resources","summary":"Hyperfine interaction is a quantum mechanical phenomenon that arises from the interplay between the magnetic moment of an atomic nucleus and the magnetic field generated by surrounding electrons.","title":"What is Hyperfine Interaction?","type":"resources"},{"content":" Poly(amidoamine) modified cellulose acetate ultrafiltration membrane # A controlled membrane fouling was requested to subject as ultrafiltration in the textile industries to treat its wastewater and reject dyes. For this purpose cellulose acetate polymer which widely used is taken and modified with second generation of poly(amidoamine) dendrimer. This polymer will enhance the hydrophilicity of polymer and in the precipitating process, based on Loeb-Sourirajan method of preparing membrane , the mass transfer happens quiet slower and macro-voids appear after drowning the cast polymer solution in the precipitation bath. Moreover, generation of surface charges on the membrane surface help to prevent dyes to absorb to the membrane structure and decrease the internal fouling.\nSource\n","externalUrl":null,"permalink":"/resources/projects/pamam-ca/","section":"Resources","summary":"This study investigates cellulose acetate ultrafiltration membranes modified with second-generation poly(amidoamine) dendrimers to improve hydrophilicity and reduce membrane fouling. The modified membranes are designed to limit dye adsorption and improve their performance in textile wastewater treatment.","title":"Poly(amidoamine) modified cellulose acetate ultrafiltration membrane","type":"resources"},{"content":" Mechanical properties of electrospun fibers with different degrees of alignment # There are many methods for fabricating nanofibers; electrospinning is one of the appropriate and easy method for producing nanofibers. Electrospinning process produce non-woven web that has special properties like large specific surface and small pore size. These properties cause that they have many applications in different fields including protective textiles, medical scaffolding, medical engineering and separating materials like filtration and membrane process. However low mechanical properties of this nanostructure web limited them for some applications. There are various ways to increase mechanical strength. In this study collector drum used with controllable speed to evaluate the effect of fiber alignment on the nanofiber web strength. Various samples were manufactured by changing rotational speed of collector. Fiber alignment and their strength were measured. In this study polyvinyl acetate (PVAc) and polyacrylonitrile (PAN) with different physical properties were electrospun at concentration of 12 wt.%. The results of the tensile test and scanning electron microscope indicate that the alignment and tensile strength were increased with increasing rotational speed of the collector. In PAN samples that have higher glass transition temperature, the increasing of tensile strength is more than the polyvinyl acetate. By increasing collector rotational speed from 0 to 3200 rpm, the strength of web has increased up to 172% that shows fibers are aligned and furthermore polymer chains are oriented.\nSource\n","externalUrl":null,"permalink":"/resources/projects/aligned-electrospun/","section":"Resources","summary":"This study investigates the relationship between fiber alignment and tensile strength in electrospun PVAc and PAN nanofiber webs. Increasing collector speed improved fiber alignment and significantly increased web strength, with PAN showing a greater improvement.","title":"Mechanical properties of electrospun fibers with different degrees of alignment","type":"resources"},{"content":" Tracking the phase behavior of light hydrolyzed and oxidized cellulose acetate membrane # Asymmetric cellulose acetate (CA) membrane are widely produced by phase inversion method. By a change in the molecular structure of CA polymer; it will act differently while quenching medium drowned in non-solvent bath. A light hydrolysis also oxidation and combination of those subjected to CA powder to claim morphological behavior on the prepared membrane. An FT-IR spectra affirmed deacetylation of CA polymer. Produced membranes are pictured by SEM cross-sectional images to show high porosity after chemical process. Also membranes are prepared to treat Dye/Water solution. Within this section by an ultrafiltration process at 3bar un-like raw CA membrane, chemically modified ones have much more permeation flux (up to 100 L/m2.h) but dye rejection was decreased as a coincident.\nSource\n","externalUrl":null,"permalink":"/resources/projects/phase-behavior/","section":"Resources","summary":"This study examines the effects of light hydrolysis, oxidation, and their combination on the morphology and performance of asymmetric cellulose acetate membranes. Chemical modification increased membrane porosity and permeation flux, reaching up to 100 L/m²·h at 3 bar, but resulted in lower dye rejection.","title":"Tracking the phase behavior of light hydrolyzed and oxidized cellulose acetate membrane","type":"resources"},{"content":" Who am I? # The Journey So Far # I\u0026rsquo;m deeply fascinated by the intersection of science, technology, and human curiosity. My interests span across theoretical concepts, practical applications, and everything in between—from physics and programming to exploring how ideas evolve and shape our world. This website is a reflection of my journey: a place to share projects, insights, and the occasional deep dive into topics that challenge and inspire me.\nA Mind for Science, A Heart for Ideas # Work experience\n2023 - 2026 Company: Zarif Mosavar Job Title: Researcher\n2021 - 2023 Company: GNK Job Title: Researcher\nEducation\n2015 - 2017 University: M.Sc at Amirkabir University of Technology - Tehran Polytechnic Textile Engineering\n2011 - 2015 University: B.Sc at Isfahan University of Technology Textile Engineering\nGet in touch at behrouz@javanmardi.org.\nPowered by Hugo \u0026amp; Blowfish\n","externalUrl":null,"permalink":"/about/","section":"Home Page","summary":"I’m interested in engineering, programming, research and science","title":"About","type":"page"},{"content":" To contact me email me at any time Fell free to follow me on LinkedIn Fell free to follow my projects at at ResearchGate Follow me on YouTube Follow and star me on GitHub To contact me email me at any time. Fell free to follow me on LinkedIn. Fell free to follow my projects at at ResearchGate. Follow me on YouTube. Follow and star me on GitHub. ","externalUrl":null,"permalink":"/contact/","section":"Home Page","summary":"ّIn this page you’ll find out different ways to contact me.","title":"Contacts","type":"page"},{"content":" Scientific Background # Dive into my scientific journey. Got a favorite topic? I\u0026rsquo;d love to hear about it.\n","externalUrl":null,"permalink":"/resources/projects/","section":"Resources","summary":"","title":"Articles \u0026 Projects","type":"resources"},{"content":"","externalUrl":null,"permalink":"/authors/","section":"Authors","summary":"","title":"Authors","type":"authors"},{"content":"","externalUrl":null,"permalink":"/categories/","section":"Categories","summary":"","title":"Categories","type":"categories"},{"content":" Projects # Explore a curated selection of my work—from technical experiments to creative endeavors. Each project reflects my passion for problem-solving, innovation, and continuous learning.\nBackground # Get to know the journey behind the name. This page offers a glimpse into my academic path, professional experiences, and the values that shape my approach to work and life.\nWeblog # A space for deep dives into science and technology that spark my curiosity. From thought-provoking concepts to hands-on experiments, this is where I share insights, discoveries, and ideas that keep my mind buzzing.\n","externalUrl":null,"permalink":"/","section":"Home Page","summary":"","title":"Home Page","type":"page"},{"content":"","externalUrl":null,"permalink":"/resources/","section":"Resources","summary":"","title":"Resources","type":"resources"},{"content":"","externalUrl":null,"permalink":"/series/","section":"Series","summary":"","title":"Series","type":"series"},{"content":"","externalUrl":null,"permalink":"/tags/","section":"Tags","summary":"","title":"Tags","type":"tags"}]