Molecular Machines: Nanoscale Science & Technology

MOLECULAR MACHINES: ADVANCING NANOSCALE SCIENCE AND TECHNOLOGY

WHY IN THE NEWS ?

  • Scientific Advancement: On October 22, researchers reported in Nature the development of a corkscrew-shaped molecular machine that moves through different states depending on the direction of electric current.
  • Nobel Recognition: The development of artificial molecular machines builds on pioneering research recognised by the 2026 Nobel Prize in Chemistry, awarded to Jean-Pierre Sauvage, Fraser Stoddart and Ben Feringa.

Molecular Machines: Nanoscale Science & Technology

Molecular Machines: Meaning and Natural Examples:

  • Basic Definition: Molecular machines are systems of molecules that convert energy into controlled movement to perform specific tasks at the molecular or nanoscale level.
  • Natural Transport: The protein kinesin transports cellular materials by moving along microscopic tracks called microtubules.
  • Muscle Movement: The protein myosin interacts with actin filaments to generate force and facilitate muscle contraction.
  • Energy Conversion: These biological systems use chemical energy, often supplied by ATP, to produce mechanical movement and perform essential cellular functions.
  • Artificial Development: Since the 1980s, scientists have designed artificial molecular machines to reproduce and extend nature’s ability to generate movement at extremely small scales.

Scientific Breakthroughs, Challenges and Applications

  • Early Innovation: In 1983, French chemist Jean-Pierre Sauvage demonstrated a method for mechanically linking ring-shaped molecules, creating structures resembling interconnected mechanical components.
  • Molecular Rotation: In 1991, Fraser Stoddart and his collaborators developed molecular architectures in which a ring could move along a molecular axle.
  • Light-Driven Motors: Dutch chemist Ben Feringa led research developing molecular motors driven by light, advancing the possibility of controlled movement at the nanoscale.
  • Recent Breakthrough: The corkscrew-shaped molecular structure reported in Nature can cycle through different states according to the direction of electric current, offering new possibilities for controlling molecular motion.
  • Technical Challenges: Random thermal fluctuations, unpredictable molecular movements, and difficulties coordinating multiple molecules complicate the development of reliable molecular machines.

ABOUT NANOTECHNOLOGY AND MOLECULAR MACHINES:

●      Nanotechnology: It involves manipulating and applying materials and structures at the nanoscale, generally around 1–100 nanometres.

●      Molecular Scale: Molecular machines operate through the controlled interactions and movements of atoms and molecules, often requiring specialised experimental techniques.

●      Potential Applications: They could support targeted drug delivery, molecular-scale sensors, advanced materials, nanoscale robotics, and future electronic devices.

●      Interdisciplinary Science: Research combines chemistry, physics, biology, materials science, and nanotechnology to develop controllable molecular systems.