1. What material, used in ancient Damascus steel swords (Wootz steel), was recently analyzed to contain carbon nanotubes?

2. Which property dramatically increases for a material when its size is reduced from the bulk to the nanoscale?

3. The concept that molecules in an open system fluctuate in energy and number, and that the relative fluctuation is inversely proportional to the square root of the average number of molecules (σ√⟨N⟩∝1/√⟨N⟩​), is related to which hypothesis?

4. Which organic materials exhibit a phase transition as a function of temperature (thermotropic) or concentration (lyotropic) due to molecular self-assembly into ordered nanostructures?

5. Who coined the term "nanotechnology" in 1974?

6. Which type of band gap material allows for efficient photoluminescence because the electron transition from the conduction band to the valence band does not require a change in momentum?

7. What is the fundamental principle that replaces classical Newtonian mechanics when describing matter at the nanoscale?

8. Which nanomaterial, characterized by high electrical conductivity and transparency, is widely used in its thin-film form as transparent electrodes in liquid crystal displays (LCDs) and touch screens?

9. In the context of solar heating, which nanomaterial is composed of nanoporous materials designed to be a transparent and thermally isolating cover material for solar collectors?

10. Nanocrystalline materials are susceptible to rapid grain growth (coarsening) at high temperatures. What technique is used to inhibit this growth by pinning the grain boundaries with secondary particles?

11. What naturally occurring material has a complex hierarchical nanostructure of collagen fibrils reinforced with calcium phosphate crystals, giving it extraordinary rigidity, flexibility, and mechanical strength?

12. What is the term for a non-volatile data storage technology that exploits the magnetic property of the electron's spin?

13. Carbon nanotubes can be either conductive or semiconducting depending on their lattice arrangement (chirality). When rolled up diagonally (spiraling hexagons), the nanotube acts as a:

14. Nanocrystalline metals are metals and alloys with a grain size below 100 nm. Which property is typically enhanced in these materials compared to their microcrystalline counterparts?

15. Why do gold nanoparticles become highly reactive, enabling them to be used as effective catalysts, despite bulk gold being an inert metal?

16. Nanowires are typically defined as 1D nanostructures with a high aspect ratio (length to width) of 1,000 or more. They exhibit quantum confinement in which dimension(s)?

17. Which semiconducting oxide nanoparticle, when arranged in arrays on a surface, is being investigated as a piezoelectric element for miniaturized power sources due to its ability to convert mechanical motion into electricity?

18. The reduction in the melting point of a free-standing nanoparticle compared to its bulk material is primarily due to which phenomenon?

19. In the free electron gas model of metals, what energy level corresponds to the highest occupied orbital at absolute zero temperature?

20. The fundamental difference between a natural nanomaterial (e.g., DNA) and a synthetic one is primarily determined by:

21. Ferrofluids are colloidal mixtures of magnetic nanoparticles (e.g., magnetite) suspended in a carrier fluid (e.g., organic solvent or water). What type of magnetic behavior do these fluids display?

22. The reduction of a substance's molar volume in an equilibrium leads to what kind of change in its chemical potential ($\mu$) as external pressure ($P$) is increased?

23. Which carbon allotrope has a unique molecular structure consisting of 60 atoms in an icosahedral symmetry, resembling a soccer ball?

24. The simplest structure that a metal nanoparticle (e.g., gold) can adopt is a spherical shape. When observed in a colloid, what nanostructure shape gives a yellow color to the solution?

25. The electrical property where the resistance of a material changes when exposed to a magnetic field, amplified in nanostructured thin films, is known as:

26. Which of the following processes in the human body occurs primarily at the nanoscale?

27. A thin film is a nanostructure with one dimension below 100 nm, thus primarily constrained in one direction. In the literature, this is also referred to as a:

28. The minimum energy required to excite an electron from the valence band to the conduction band in a semiconductor is known as the:

29. Nanotechnology is often described as a "horizontal-enabling convergent technology" because it is an enabling platform that brings together sectors of science that were previously separated. An example of convergence is seen in:

30. Nanocrystalline ZnO and  TiO2  are being studied for applications in photocatalysis. Why do these materials only work effectively when irradiated with UV light?

31. The ability of a surface to totally repel water with a contact angle greater than 140° is known as:

32. The self-assembly of molecules into nanostructures that mimic the structure and function of the extracellular matrix (ECM) to support cell growth is the foundation of which medical field?

33. Nanomaterials composed of nanometre-sized crystallites dispersed in a matrix of different chemical composition belong to which family?

34. According to the simplest application-based classification, structures with all three dimensions constrained in the nanoscale are classified as:

35. Nanofibres, such as carbon nanotubes, are classified as which dimensional structure due to being constrained in two dimensions but free to move along the third?

37. The dramatic color change observed in gold from yellow (bulk) to ruby-red (nanoparticles) is due to which optical phenomenon?

38. Which type of nanoparticle is made of a dielectric core (e.g., silica) covered in a thin metallic (e.g., gold) shield, allowing its optical resonance to be tuned from near-UV to mid-infrared?

39. Carbon nanotubes (CNTs) are theoretically stronger than steel but are much lighter. This makes them ideal for lightweight construction in sectors like the automotive and aviation industries. Which value reflects their stiffness (Young's Modulus)?

40. Nanocomposites consisting of an organic matrix (e.g., polymer) reinforced by layered inorganic materials like montmorillonite are commonly known as:

41. Which highly porous ceramic material, often synthesized via the sol-gel method, is composed of a continuous network of particles with air trapped in nanoscale interstices, making it suitable for thermal insulation?

42. Carbon nanotubes (CNTs) are primarily composed of which type of chemical bonds, similar to graphite?

43. A block copolymer typically consists of sequences of monomers joined together. If made of hydrophilic and hydrophobic blocks, these molecules self-assemble in water to form spherical micelles, cylindrical micelles, or:

44. What are nanoparticles of Krypton, specifically clusters with a certain stable number of atoms, referred to as?

When the size of a metal nanoparticle is reduced, the energy of an electron is no longer spread out in continuous bands of energy but in discrete, quantified levels, demonstrating the conversion of a conductor into a semiconductor. This concept describes:

46. For a metal, the highest occupied energy level is the Fermi Level. Exciting an electron to the Conduction Band leaves a vacancy in the Valence Band, which behaves like a positively charged particle called a(n):

47. The inverse of the decay constant (κ¯1) for the electric potential around a charged nanoparticle in an electrolyte solution is known as the:

48. Which synthetic material is often used as a coating on textiles to confer superhydrophobic (stain and water-repellent) properties?

49. The Hall-Petch relationship states that the hardness and yield strength of crystalline materials generally increase as grain size decreases. In nanocrystalline materials (below a critical size), this trend often reverses, known as the:

50. The smallest transistor in a modern commercial processor (e.g., 45 nm node) is in the size range of: