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Subject: Science and Technology

  • Quantum Clocks and the Cost of Timekeeping

    Why in the News?

    A new study in Physical Review Letters finds that in quantum clocks the main cost of timekeeping comes from measurement rather than the clockwork itself, reshaping ideas in quantum metrology.

    What are Quantum Clocks?

    • Concept: Quantum clocks are timekeeping devices based on microscopic quantum systems whose transitions – atomic jumps, tunnelling events, or energy-level shifts – act as clock ticks.
    • Quantum Nature: Unlike classical clocks, their evolution is probabilistic, allowing temporary backward ticks due to quantum fluctuations while still needing a mechanism to mark irreversible flow of time.
    • Irreversibility Requirement: A functional clock must create a permanent record distinguishing past from future, despite underlying reversible quantum dynamics.
    • Role of Measurement: Their precision depends on both internal quantum transitions and the classical measurement system used to read them, since measurement converts quantum events into usable time signals.
    • Double Quantum Dot Model: In setups using double quantum dots (DQDs), a single electron tunnels between two nanoscale sites; each tunnelling event forms a discrete tick.
    • Quantum Dot Basis: Quantum dots – recognised by the 2023 Nobel Prize in Chemistry – can confine single electrons precisely, enabling well-resolved quantum transitions.
    • Entropy and Precision: The clock’s internal entropy rises with precision; at equilibrium (equal forward and backward ticks), entropy is zero and the system loses its ability to mark time.

    Recent Findings and Implications:

    • New Demonstration (2025): A Physical Review Letters study built a working quantum clock using a double quantum dot and separately measured entropy from the clockwork and from the measurement process.
    • Key Result: The entropy generated by measurement (via DC sensing and RF reflectometry) was nine orders of magnitude higher than the entropy needed for the electron-tunnelling clock itself.
    • Zero-Entropy Clockwork Still Works: Even when the quantum system produced no entropy, continuous measurement still created an irreversible classical record, allowing timekeeping.
    • Core Insight: The arrow of time in quantum clocks arises mainly from the classical measurement interface, not from the quantum dynamics.
    • 2023 Theoretical Link: Supports earlier findings that quantum measurement is inherently invasive and energy-costly, and that increasing measurement frequency does not always improve accuracy.

    Implications:

    • Thermodynamic Cost: Extracting information from any quantum system has an energy and entropy cost, affecting quantum sensing, quantum metrology, and clock design.
    • Application Outlook: Ultra-precise atomic clocks may be improved by lower-entropy measurement systems, leading to more efficient next-generation timekeeping.
    • Quantum Technologies: Insights are crucial for scalable quantum computers, where reading qubits must be precise yet thermodynamically minimal.
    • Conceptual Implication: Suggests that the microscopic arrow of time emerges from creating readable, irreversible records, rather than solely from quantum evolution itself.
    [UPSC 2022] Which one of the following is the context in which the term “qubit” is mentioned?

    Options: (a) Cloud Services (b) Quantum Computing* (c) Visible Light Communication Technologies (d) Wireless Communication Technologies

     

  • Study on Lithium-Rich Red Giant Stars and Helium Abundance

    Why in the News?

    A recent study conducted by Indian Institute of Astrophysics (IIA) has discovered a link between Lithium-rich red giant stars and their enhanced helium abundance.

    What are Red Giant Stars?

    • Overview: Evolved stars that have exhausted core hydrogen, causing the core to contract and the outer layers to expand into a large, cool, reddish envelope.
    • Formation Process: Core contraction increases temperature while the outer shell expands and cools, triggering hydrogen shell burning.
    • Temperature and Luminosity: Surface temperature drops to 2,000–5,000 K, but luminosity rises sharply due to vastly increased radius.
    • Internal Fusion: Helium fusion begins in the core, producing heavier elements like carbon and oxygen.
    • Evolutionary Stage: Represents the late life cycle of medium-mass stars; the Sun will enter this phase in about 5 billion years.
    • End Stage: Outer layers are shed into a planetary nebula, leaving a white dwarf remnant that cools over time.

    Key Findings of the Study:

    • New Discovery: IIA established the first spectroscopic link between helium enhancement and lithium enrichment in red giant stars.
    • Data Source: Based on Himalayan Chandra Telescope observations and archival global spectroscopic datasets.
    • Sample Profile: 20 cool giants studied- 18 red giants and 2 supergiants.
    • Helium-Enriched Stars: Six stars showed high helium-to-hydrogen ratios (He/H > 0.1).
    • Distribution: Five were red giants and one a supergiant, showing a trend toward helium enhancement in lithium-rich giants.
    • Scientific Insight: Offers direct evidence of deep internal mixing and nucleosynthesis shaping surface chemical composition.

    What is the correlation between Lithium and Helium?

    • Coupled Enrichment: All helium-enhanced giants were lithium-rich, suggesting a shared internal mixing mechanism.
    • Asymmetry: Not all lithium-rich giants showed helium enhancement, implying lithium can rise without parallel helium increase.
    • Internal Mixing Role: Deep convection likely dredges up newly formed helium and lithium from the interior to the photosphere.
    • Photospheric Evidence: Confirms mixing-driven changes detectable on the stellar surface during the red giant stage.

    Significance of the Findings:

    • First Measurement: Provides the first direct spectroscopic photospheric helium estimates for normal and lithium-rich red giants.
    • Astrophysical Value: Refines understanding of mixing, nucleosynthesis, and energy transport inside red giant branch (RGB) stars.
    • Galactic Evolution: Improves models of how stars contribute heavier elements to the interstellar medium.
    • Methodological Advance: Strengthens indirect helium-measurement techniques for cool stars where helium lines are not visible.
    • Evolutionary Insight: Shows helium enrichment is integral to changes in luminosity, temperature evolution, and mass-loss pathways.
    [UPSC 2023] Consider the following pairs:

    Objects in space: Description

    1. Cepheids : Giant clouds of dust and gas in space

    2. Nebulae : Stars which brighten and dim periodically

    3. Pulsars : Neutron stars that are formed when massive stars run out of fuel and collapse

    How many of the above pairs are correctly matched?

    Options: (a) Only one* (b) Only two (c) All three (d) None

     

  • NASA’s ESCAPADE Mission to Mars

    Why in the News?

    NASA launched the ESCAPADE mission aboard the New Glenn rocket developed by Blue Origin.

    About ESCAPADE Mission:

    • Mission Overview: ESCAPADE is a NASA Mars mission consisting of two identical orbiters (Blue and Gold) designed to study how the solar wind interacts with the Martian atmosphere and magnetosphere.
    • Launch: Launched aboard Blue Origin’s New Glenn rocket, marking a major step for commercial heavy-lift launches.
    • Programme: Part of NASA’s SIMPLEx programme, which focuses on low-cost, small planetary missions using compact spacecraft.
    • Science Goal: To understand how Mars lost its ancient thick atmosphere by measuring plasma, magnetic fields, and ion escape processes driven by the solar wind.
    • Trajectory: Uses an innovative path via the Earth–Sun L2 point, loitering for nearly a year before heading to Mars due to an imperfect launch-window alignment; arrival expected in 2027.

    Key Features of ESCAPADE:

    • Twin–Spacecraft Design: Two orbiters operate together to take simultaneous measurements, allowing scientists to separate time-varying vs space-varying phenomena around Mars.
    • Hybrid Magnetosphere Focus: Mars lacks a global magnetic field but has patchy crustal magnetisation; ESCAPADE will map how these regions interact with solar-wind plasma and how ions escape into space.
    • Low-Cost Architecture: Built on Rocket Lab’s Photon spacecraft bus, making ESCAPADE a model for frequent, affordable interplanetary missions (~200–500 kg class).
    • Advanced Instruments:
      1. EMAG (magnetometer) to measure magnetic fields.
      2. EESA (electrostatic analyzer) to analyse ions and electrons.
      3. ELP (Langmuir probe) to study plasma density and temperature.
    • Innovative Mission Timeline:
      • One year at Earth–Sun L2.
      • Transfer to Mars in 2027.
      • Science operations begin after Mars-orbit insertion.
    • Science Operations:
      • String-of-pearls formation: both orbiters on the same orbit, separated by minutes.
      • Divergent orbits: spacecraft split to sample different regions of Mars’s space environment.
    • Commercial Enabling: Demonstrates the role of commercial heavy rockets like New Glenn in future deep-space missions.
    [UPSC 2018] What is the purpose of the US Space Agency’s Themis Mission, which was recently in the news?

    Options: (a) To study the possibility of life on Mars

    (b) To study the satellites of Saturn

    (c) To study the colorful display of high latitude skies*

    (d) To build a space laboratory to study stellar explosions

     

  • Holding up GLASS to India: securing stewardship to tackle AMR

    INTRODUCTION

    AMR in India is now labelled a “serious and escalating threat”, with the latest WHO GLASS report (2025) confirming extraordinarily high resistance levels across commonly used antibiotics. Nearly one in five severe infections in India mirrored or exceeded South and East Asian trends, and one in six confirmed infections was resistant. India’s high infectious disease burden, misuse of antibiotics, weak surveillance, and gaps in healthcare infrastructure continue to aggravate the problem. The article highlights incomplete data, insufficient funding, fragmented stewardship, and the urgent need for rational antibiotic use, surveillance strengthening, and affordable new-generation antibiotics.

    WHY IN THE NEWS? 

    India features prominently in the WHO’s October 2025 GLASS report, which confirms that the country now records some of the highest antibiotic resistance rates globally, particularly for gram-negative pathogens. For the first time, GLASS shows significant data gaps, reflected in India uploading surveillance results from only tertiary hospitals, leaving rural and peripheral areas undocumented. The report highlights a sharp contrast with global progress, exposing India’s limited surveillance expansion, weak stewardship, and slow adoption of newer effective antibiotics, despite AMR being among the country’s gravest public-health threats.

    Understanding the Scale of AMR in India

    1. High Resistance Rates: India shows disproportionately high resistance to commonly used antibiotics, especially in infections caused by E. coli, Klebsiella pneumoniae, Staphylococcus aureus, and pathogens causing sepsis in ICUs.
    2. Escalating Threat Category: WHO labels AMR in India as a “serious and escalating threat,” placing India among the highest global burden countries.
    3. Gram-Negative Pathogens: Severe risks emanate from resistance trends in gram-negative bacteria which limit treatment options in hospitals.
    4. Community-Hospital Gap: Surveillance primarily reflects tertiary hospital data, leaving a large rural and primary-care void, producing incomplete national estimates.

    Why Current Surveillance is Insufficient

    1. Incomplete Data Representation: GLASS data reflects only a segment of India’s population; peripheral, rural, and primary-care levels remain unrepresented, leading to erroneous conclusions.
    2. Fragmented Networks: Laboratories under NCDC’s AMR and AMRRSN networks provide data, but coverage is inadequate for a country of India’s scale.
    3. Operational Challenges: Shortage of trained microbiologists, inconsistent reporting, and infrastructure deficits weaken surveillance reliability.
    4. Underestimation of Burden: Without wider surveillance, actual AMR spread across different geographies or demographic groups remains unknown.

    Kerala’s State-Led Model of AMR Management

    1. State Action Plan Success: Kerala’s progress stems from early adoption of the State Action Plan aligned with India’s National Action Plan (NAP-AMR).
    2. Whole-of-System Approach: Kerala integrates veterinary, human health, and environmental data, demonstrating One Health operationalisation.
    3. Institutional Leadership: Dedicated stewardship committees and infection-control protocols ensure sustained monitoring and policy continuity.

    Antibiotic Stewardship and Public Awareness Challenges

    1. Unregulated Antibiotic Use: Easy over-the-counter access, self-medication, and incomplete courses contribute to rising resistance.
    2. Hospital Overuse: Lack of stewardship committees and infection-control practices deepen resistance in ICUs and emergency departments.
    3. Limited Community Awareness: Behavioural change campaigns remain inadequate, leading to misconceptions about antibiotic effectiveness.
    4. Inappropriate Prescriptions: Physicians often prescribe broad-spectrum antibiotics without culture sensitivity results due to delays or lack of labs.

    Innovation, R&D Pipelines and the Crisis of New Antibiotics

    1. Weak Domestic Innovation: Only 2 of the 32 antibiotics under global development meet WHO innovation criteria.
    2. Positive Trend: India’s CDSCO approved two new antibiotic candidates recently, while six others received global approval.
    3. Global Gap: Out of 97 candidates in preclinical pipelines (2022), few target WHO’s priority pathogens.
    4. High Barriers: Costly R&D, limited incentives, and delayed regulatory approvals weaken India’s innovation environment.

    Global and National Funding Gaps

    1. Insufficient Domestic Funding: India’s AMR response suffers from limited financial allocations, affecting surveillance expansion and lab capacity building.
    2. Gaps in Multilateral Support: Despite WHO’s Global AMR Challenge, LMICs like India lack sustained funding for new antibiotics and diagnostics.
    3. Need for Collaborative Platforms: Strengthened partnerships with bodies like the AMR Industry Alliance and CARB-X can accelerate innovation pipelines.

    Why Solutions Must Prioritise Stewardship, Surveillance, and Affordability

    1. Urgency of Behaviour Change: Stewardship requires both medical and community engagement to reduce irresponsible antibiotic use.
    2. Strengthening Peripheral Health Systems: Decentralised surveillance networks are essential to capture India’s actual AMR burden.
    3. Making New Antibiotics Accessible: India must prioritise affordability and availability given rising MDR (multi-drug resistant) infections in LMICs.
    4. Integrating One Health: Coordinated animal-human-environmental monitoring is indispensable for durable AMR containment.

    CONCLUSION

    India stands at a critical juncture where AMR has outpaced existing stewardship, surveillance, and innovation capabilities. The GLASS 2025 report acts as a mirror reflecting the country’s systemic gaps, from incomplete data and misuse of antibiotics to insufficient funding and slow R&D advancement. A robust national response must integrate strong stewardship, affordable innovation, decentralised surveillance, and a One Health framework to prevent AMR from becoming an unmanageable public-health catastrophe.

    PYQ Relevance

    [UPSC 2014] Can overuse and free availability of antibiotics without Doctor’s prescription be contributors to the emergence of drug-resistant diseases in India? What are the available mechanisms for monitoring and control? Critically discuss the various issues involved.

    Linkage: Because AMR is a recurring public-health crisis with direct links to governance, regulation, and science-tech, making it a favourite UPSC theme. The article shows rampant antibiotic misuse and OTC access driving India’s high resistance rates. This exactly reflects the PYQ’s focus on irrational use, weak monitoring, and stewardship gaps.

  • Why Hepatitis A deserves a place in India’s Universal Immunisation Programme (UIP)?

    Why in the News?

    Health authorities are debating whether Hepatitis A vaccine should have higher priority for inclusion in Universal Immunisation Programme (UIP) compared to Typhoid Conjugate Vaccine (TCV).

    About Hepatitis A:

    • Overview: Viral infection caused by Hepatitis A Virus (HAV), spreading through contaminated food, water, or close contact with an infected person.
    • Nature of Disease: Leads to acute liver inflammation with fever, jaundice, nausea, abdominal pain, and fatigue.
    • Treatment: No antiviral therapy; illness is self-limiting and recovery occurs within six months with supportive care.
    • Vaccine: Highly effective (90 to 95 percent), long-lasting immunity for 15 to 20 years or lifelong; prevents symptomatic infection.
    • Current Trend: Improved sanitation lowers childhood exposure, but adult susceptibility is rising, increasing disease severity.

    What is Universal Immunisation Programme (UIP)?

    • Launch and Evolution: Started in 1985; later integrated with Child Survival and Safe Motherhood Programme (1992) and National Rural Health Mission (2005).
    • Coverage: Provides free vaccines against 12 diseases–  9 nationally (Diphtheria, Pertussis, Tetanus, Polio, Measles, Rubella, Tuberculosis, Hepatitis B, Hib) and 3 in selected states (Rotavirus, Pneumococcal Pneumonia, Japanese Encephalitis).
    • Achievements: Played a central role in polio eradication, reducing measles deaths, and improving child survival indicators.

    Why Hepatitis A deserves priority?

    • Greater Adult Severity: Shift from childhood to adult infections results in higher rates of acute liver failure.
    • Recent Outbreaks: Reported surges in Kerala, Maharashtra, Delhi, and Uttar Pradesh signal a widening public-health risk.
    • Falling Immunity: Seroprevalence has declined from around 90 percent to under 60 percent in many cities, leaving millions unprotected.
    • Indigenous Vaccine: Biovac-A (Biological E Ltd.) is safe, affordable, and effective, with single-dose protection simplifying rollout.
    • No Resistance Concerns: Viral disease with no antibiotic use eliminates resistance challenges.
    • Cost Advantage: More economical and operationally easier than multi-dose vaccines like typhoid conjugate vaccine.
    • Policy Relevance: Inclusion in the national programme could curb outbreaks and reduce adult liver-failure cases.

    Back2Basics: Hepatitis

    • What is it: Liver inflammation from viruses, alcohol, toxins, drugs, autoimmune disorders, or metabolic issues.
    • Viral Types:
      • A – Fecal-oral; acute; vaccine available.
      • B – Blood/body fluids; chronic risk; vaccine available.
      • C – Blood-to-blood; often chronic; no vaccine; treatable with antivirals.
      • D – Discussed above.
      • E – Fecal-oral; usually acute.
    • Chronic B, C, D: Major drivers of cirrhosis and liver cancer.
    • Prevention: Vaccination (A, B), safe injections, screened blood, safe sex, good hygiene.

     

    [UPSC 2019] Which one of the following statements is not correct?

    (a) Hepatitis B virus is transmitted much like HIV.

    (b) Hepatitis B, unlike Hepatitis C, does not have a vaccine. *

    (c) Globally, the number of people infected with Hepatitis B and C viruses are several times more than those infected with HIV.

    (d) Some of those infected with Hepatitis B and C viruses do not show the symptoms for many years.

     

  • ‘DRISHTI’ System for AI Freight Wagon Safety

    Why in the News?

    Indian Railways is deploying an AI system called DRISHTI (AI-Based Freight Wagon Locking Monitoring System) to spot unlocked or tampered freight wagon doors in motion, developed with IIT Guwahati to improve freight safety.

    About the DRISHTI System:

    • Overview: It is an Artificial Intelligence system developed by the Northeast Frontier Railway with IIT Guwahati TIDF to monitor wagon door-locking integrity.
    • Primary Objective: Detects unlocked, tampered, or improperly sealed wagon doors automatically during train movement to improve freight security.
    • Technology Framework: Uses AI-enabled cameras, computer vision, and machine-learning algorithms to analyse door-locking mechanisms in real time.
    • Operational Value: Ensures cargo safety without halting trains, addressing pilferage, tampering, and human-error-based sealing failures.
    • Current Status: Undergoing successful trials for nearly ten months on selected freight rakes, with high anomaly-detection accuracy.

    Key Features:

    • Real-Time Monitoring: Continuously tracks door position and locking condition using AI-powered imaging units.
    • Anomaly Detection: Flags tampering, loose locks, or improper sealing; sends immediate alerts to control rooms.
    • Non-Intrusive Operation: Functions during full-speed train movement, avoiding delays or stoppages.
    • Automated Alerts: Provides instant notifications for rapid operator response and incident verification.
    • Reduced Manual Checks: Minimises reliance on manual sealing inspections, improving safety and resource efficiency.
    • Data Integration: Compatible with freight-management platforms for audit trails, analytics, and tracking transparency.
    • Scalable Architecture: Designed for phased expansion across national freight routes after successful field validation.
    • Indigenous Innovation: Fully developed in India, supporting the Atmanirbhar Bharat goal in transport and logistics technology.
    • Safety and Efficiency Gains: Enhances wagon security, reduces theft, supports predictive maintenance, and improves overall freight reliability.
    [UPSC 2025] Consider the following statements:

    I. Indian Railways have prepared a National Rail Plan (NRP) to create a future-ready railway system by 2028.

    II. ‘Kavach’ is an Automatic Train Protection system developed in collaboration with Germany.

    III. ‘Kavach’ system consists of RFID tags fitted on track in station section.

    Which of the statements given above are not correct?

    (a) I and II only * (b) II and III only (c) I and III only (d) I, II and III

     

  • Ricin: the new Bio-Weapon

    Why in the News?

    Recent investigations after the Delhi Bomb Blast revealed a plot to use ricin, a deadly biological toxin, for large-scale terror attacks.

    About Ricin:

    • Origin: Ricin is a highly toxic protein derived from the mash left after processing castor beans (Ricinus communis) for castor oil.
    • Discovery: First isolated in 1888 by German scientist Peter Hermann Stillmark, who documented its lethal, cell-destroying properties.
    • Mechanism of Action: Ricin enters human cells and blocks protein synthesis, causing rapid cell death, tissue damage, and multi-organ failure. Even a few micrograms can be fatal.
    • Routes of Exposure: Can cause poisoning through inhalation, ingestion, or injection, each producing sudden symptoms like respiratory collapse, gastrointestinal bleeding, seizures, and circulatory failure.
    • Treatment: No antidote exists; medical management involves supportive care such as oxygen therapy, IV fluids, activated charcoal (if ingested early), and mechanical ventilation.
    • Weaponisation Risk: Due to easy availability from an agricultural by-product and high lethality, ricin is classified globally as a potential bioterrorism agent.

    Legal Classification and Security Implications:

    • International Status: Listed under Schedule 1 of the Chemical Weapons Convention (CWC) and controlled under the Biological Weapons Convention (BWC).
    • Indian Legal Framework: Criminalised under the Chemical Weapons Convention Act, 2000, and the Unlawful Activities (Prevention) Act (UAPA), with offences being non-bailable.
    • Penalties: Violations involving ricin can result in life imprisonment under Indian law.
    • WMD Classification: Covered under the Weapons of Mass Destruction and Delivery Systems Act, 2005, placing it within the legal category of weapons of mass destruction.
    • Dual-Use Concern: Castor is an industrial crop, making ricin a dual-use substance requiring strict monitoring of castor by-products.

  • What is the Rare Earth Hypothesis?

    Why in the News?

    This newscard is an excerpt from the original article published in The Hindu.

    What is the Rare Earth Hypothesis?

    • About: Proposed by Peter Ward (palaeontologist) and Donald Brownlee (astronomer) in 2000, it suggests that simple life (like microbes) may be common, but complex life (like plants and animals) is extremely rare in the universe.
    • Core Idea: Earth supports advanced life because of a unique mix of conditions such as a stable orbit, a protective magnetic field, active plate tectonics, and giant planets like Jupiter that shield it from asteroids.
    • Meaning: The Earth is not an ordinary planet; it is a special case where everything aligned perfectly to allow complex life to evolve.

    How does it differ from other Theories?

    • Drake Equation / Mediocrity Principle: Say that life should be common since there are billions of stars; the Rare Earth Hypothesis says complex life is rare even if basic life is not.
    • Fermi Paradox: Asks “Where is everybody?” The Rare Earth answer is that complex intelligent life is rare, so we don’t see others.
    • Copernican Principle: Claims Earth is ordinary; the Rare Earth Hypothesis argues Earth is extraordinary and rare in its conditions.

    Evidence supporting the Hypothesis:

    • Exoplanet Studies (Kepler Mission): Thousands of Earth-sized planets found, but few have stable climates or protective atmospheres like Earth.
    • M-dwarf Planets: Many orbit small stars and lose their atmospheres due to strong radiation.
    • No Alien Signals: Breakthrough Listen and other searches found no technosignatures from intelligent civilizations.
    • Earth’s Uniqueness: Plate tectonics and a carbon cycle help Earth keep a stable climate for billions of years; such conditions have not yet been found elsewhere.

    Scientific Outlook and Future Research:

    • Current View: Microbial life might exist on many planets, but stable, complex ecosystems like Earth’s are probably rare.
    • Ongoing Studies:
      • James Webb Space Telescope (JWST) searches for gases like oxygen, methane, and water on distant planets.
      • Planetary models test if other worlds have tectonics or internal heat for climate balance.
      • Technosignature surveys continue for traces of intelligent life.
    • Future Missions: Extremely Large Telescope (ELT) and Habitable Worlds Observatory (HWO) will study exoplanet atmospheres more closely.
    • Significance: The Rare Earth Hypothesis remains plausible but unproven, showing that life may be widespread, but Earth-like complexity could be one of the universe’s rarest achievements.
    [UPSC 2018] Which of the following phenomena might have influenced the evolution of organisms?

    1. Continental drift

    2. Glacial cycles

    Select the correct answer using the code given below.

    Options: (a) 1 only (b) 2 only (c) Both 1 and 2* (d) Neither 1 nor 2

     

  • [pib] India’s First MWh-Scale Vanadium Redox Flow Battery at NTPC NETRA 

    Why in the News?

    The Union Ministry of Power has inaugurated India’s largest and first MWh-scale Vanadium Redox Flow Battery (VRFB) of 3 MWh capacity at NETRA, NTPC’s R&D Centre in Greater Noida.

    About the Vanadium Redox Flow Battery (VRFB):

    • Overview: A rechargeable flow battery that stores energy in liquid electrolytes containing vanadium ions in different oxidation states.
    • Core Principle: Uses the same element vanadium for both electrolytes, preventing cross-contamination and extending operational life.
    • Working Mechanism: Energy is stored through oxidation and reduction reactions of vanadium ions, where electrons are exchanged between two electrolyte tanks.
    • Cell Design: Electrolytes circulate through a cell stack separated by an ion-selective membrane that enables ion movement while stopping mixing.
    • Scalability: Energy capacity depends on electrolyte volume, while power output depends on cell stack size, allowing flexible scaling.
    • Application Focus: Ideal for stationary, grid-scale energy storage, renewable energy integration, and backup power systems.

    Benefits over Conventional Batteries:

    • Independent Scalability: Energy and power can be scaled separately, perfect for large utility storage and renewable grids.
    • Extended Lifespan: Can endure thousands of cycles since vanadium electrolytes don’t degrade or mix.
    • Full Discharge Safety: Can be fully discharged (100%) without damaging capacity, unlike lithium-ion batteries.
    • High Safety Level: Uses non-flammable, water-based electrolytes, eliminating risk of fire or explosion.
    • Eco-Friendly: Recyclable and non-toxic electrolytes reduce environmental impact and support circular use.
    • Long-Duration Storage: Provides 6–10+ hours of continuous energy, ideal for stabilizing solar and wind supply.
    • Low Maintenance: Fewer mechanical parts and no thermal runaway risk ensure long-term durability.
    • Fast Response: Reacts quickly to grid fluctuations, improving power quality and reliability.

    Limitations:

    • High Initial Cost: Requires expensive vanadium electrolyte and specialized components, leading to higher upfront installation costs than lithium-ion systems.
    • Low Energy Density: Stores less energy per unit volume, making it unsuitable for mobile or space-constrained applications like electric vehicles.
    • Complex Infrastructure: Needs large storage tanks, pumps, and control systems, which increase operational complexity and land requirements.
    [UPSC 2025] In the context of electric vehicle batteries, consider the following elements:

    I. Cobalt II. Graphite III. Lithium IV. Nickel

    How many of the above usually make up battery cathodes?

    (a) Only one (b) Only two (c) Only three* (d) All the four

     

  • Altermagnetism emerges as a new class of Magnetic Order

    Why in the News?

    Scientists discovered a new type of magnetism called altermagnetism, confirmed in 2024, which combines features of ferromagnetism and antiferromagnetism.

    What is Altermagnetism?

    • Overview: A new form of magnetism discovered in 2019 and proven experimentally in 2024; combines traits of ferromagnetism and antiferromagnetism.
    • Mechanism: Atoms have opposite (antiparallel) spins like in antiferromagnets, but their alignment follows mirror or rotational symmetry, not simple alternation.
    • Magnetic Effect: Although it has no external magnetic field, the electrons show different energy levels for spin-up and spin-down states.
    • Discovery: First observed in manganese telluride (MnTe) through photoemission and X-ray imaging techniques.
    • Scientific Relevance: Introduces a magnetically neutral but electronically active material class useful for next-generation electronics.

    Distinctive Properties:

    • Zero External Magnetism: Produces no external field but shows strong internal spin asymmetry.
    • Spin-Polarised Currents: Can carry magnetic-like electric currents without stray fields.
    • Ultrafast Response: Works at terahertz (THz) frequencies, about 1000× faster than conventional magnetic devices.
    • Stable Performance: Maintains stable magnetic order even under changing conditions.
    • Crystal-Based Symmetry: Magnetism arises from atomic structure, not external alignment.

    How does it differ from other Magnetisms?

    • Ferromagnetism: All spins align in the same direction, creating a strong external magnetic field.
    • Antiferromagnetism: Spins align in opposite directions, fully cancelling magnetism with equal spin energy.
    • Altermagnetism: Spins align oppositely but mirror-linked, giving energy difference between spins, no net field, yet internal magnetic effects.

    Applications:

    • Spintronics: Enables compact, energy-efficient data storage and logic devices.
    • Quantum Computing: Provides magnetically quiet materials for stable qubit performance.
    • High-Speed Electronics: Supports ultrafast processors operating at terahertz levels.
    • Advanced Sensors: Useful for precise, low-noise magnetic detection.