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Nanochemistry - 3

Covers self-assembly principles, bottom-up nanomanufacturing approaches, colloidal crystal formation, and nanocrystal preparation methods in nanochemistry

15 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Which of the following approaches of preparing nano-structured materials make(s) use of techniques of colloidal chemistry to pattern materials?

  1. Top-down approach
  2. Bottom-up approach
  3. Both (1) and (2)
  4. Neither (1) nor (2)
Question 2 Multiple Choice (Single Answer)

In which type of self assembly is the free energy of the system reduced?

  1. Static
  2. Dynamic
  3. Sub-static
  4. Neither in static nor in dynamic
Question 3 Multiple Choice (Single Answer)

Which of the following approaches is/are used for the manufacturing of nano-structured molecules?

  1. Top-down approach
  2. Bottom-up approach
  3. Self assembly
  4. All of the above
Question 4 Multiple Choice (Single Answer)

Which of the following nanocrystals can be prepared by recrystallisation of pie conjugated compounds in H2O?

  1. Metal nanocrystals
  2. Condensed ring type nanocrystals
  3. Polydiacetylene type nanocrystals
  4. Natural nanocrystals
Question 5 Multiple Choice (Single Answer)

Which among the following options is incorrect regarding Self Assembly?

  1. Assembly of molecules is directed through covalent bonds
  2. Self assembly process is spontaneous
  3. Self assembled systems are thermodynamically more stable than isolated systems
  4. Due to spontaneous nature, nanostructure is built itself
Question 6 Multiple Choice (Single Answer)

Which of the following is not an example of Molecular Self assembly?

  1. Formation of molecular crystals and colloids
  2. Formation of lipid bilayer and phase separated polymers
  3. Self assembly of lipid bilayer membrane in cells of living systems
  4. Folding of peptide chains into proteins
Question 7 Multiple Choice (Single Answer)

Who developed the philosophical roots of supramolecular chemistry?

  1. J.D. Vander Waals
  2. Herman Emil Fischer
  3. Latimer
  4. Rodebush
Question 8 Multiple Choice (Single Answer)

For a liquid surface:

  1. Surface stress = specific surface energy
  2. Surface stress > Specific surface energy
  3. Surface stress < specific surface energy
  4. There is no relation between surface stress and surface energy
Question 9 Multiple Choice (Single Answer)

Which of the following methods can be used to prepare colloidal crystals?

  1. Stokes Sedimentation
  2. Electrophoresis
  3. Evaporation induced self assembly
  4. All of the above
Question 10 Multiple Choice (Single Answer)

Which of the following statements are true regarding self assembly

  1. Self assembly is spontaneous but not reversible
  2. Self assembly is reversible but not spontaneous
  3. Self assembly is both spontaneous and reversible
  4. Self assembly is neither spontaneous nor reversible
Question 11 Multiple Choice (Single Answer)

Which of the following is a not an advantage of bottom-up approach of nanomanufacture?

  1. It can assemble onto curved and other nanoplanar surfaces
  2. It can be massively parallelized
  3. It can produce structures with features down to a few nm
  4. The process is well known theoretically
Question 12 Multiple Choice (Single Answer)

In self assembled monolayer if the precursors are of general formula XL then which of the following is NOT true?

  1. Addition of XL to the metal surface results in a closely packed array of XL
  2. X is a ligand capable of binding to a substratum
  3. Currently two main type of L are thiol and mercaptan
  4. X can be functionalized at the end opposite from L
Question 13 Multiple Choice (Single Answer)

Which of the following is not true regarding mesoscale self assembly?

  1. It refers to self assembly carried out with objects having size less than 10 nm
  2. It is used in fabricating artificial crystals and three dimensional structures
  3. It employs selective patterning of the faces of the object into hydrophilic and hydrophobic sets
  4. The capillary interaction between individual units is responsible for mesoscale self assembly.
Question 14 Multiple Choice (Single Answer)

Which of the following is not a reason for wide usage of Alkane thiols as ligands?

  1. Solubility is greater
  2. Speed of reaction is fast
  3. Compatibility with organic functional groups
  4. Spontaneous adsorption on the surface
Question 15 Multiple Choice (Single Answer)

Which of the following does not come under bottom-up approach of nanomanufacturing?

  1. Growth
  2. Self assembly
  3. Molecular manufacturing
  4. Semiconductor processing
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