2. [5 points] If a cube of 1 mm side is divided into 1 nm-sized cubes, the total

ID: 1043734 • Letter: 2

Question

2. [5 points] If a cube of 1 mm side is divided into 1 nm-sized cubes, the total surface area will increase by a factor of a. b. 2 x10 c. 6x10 d. 6x10% 8. [5 points] DLS measurements are useful in exploring a. b. c. d. particle size distributions particle aggregation phenomena micellar systems all of the above 4. [5 points] Which technique would be most suitable for redox states for iron nanoparticles? a. b. c. d. Raman spectroscopy Mossbauer spectroscopy nuclear magnetic resonance atomic force microscopv 5. [5 points] Materials with high tendency to become solvated (wet) are called a. lyophobic b. lyophilic c. colloids d. solvents 6. [5 points] Which is true for Type I photosensitization pathway a. needs initial excitation of the photosensitizing molecule b. involves transfer of excited spin-state energy from sensitizer to another molecule c. requires a donor molecule d. necessitates a long-lived triplet excited state

Explanation / Answer

The cube has 6 faces and the area of each face is given by the squre of the side of the face

So the total surface area of the cube is given by

= 6* (edge)^2

Now the surface area of 1mm cube = 6* ( 1 * 10-3 ) ^2 = 6* 10 -6 m2

and the surface area of the cube having 1nm side = 6* ( 10-9) ^2 = 6* 10-18 m2

the no of 1nm sized cube is calculated as

1mm /1nm = 10 6

the no of cubes of 1nm sized = 106) ^3 = 10^18

the total surface area of 1nm sizes cube = 10 18 * 6 * 10-18 = 6 m^2

the increasing factor is 10 6

so we can say that the increasing factor is given by the decrease in the size of the sides of the cube

2. DLS method can determine all the three that is particle size distribution , aggregation phenomina and misellar system

Dynamic Light Scattering: Measuring the Particle Size Distribution and Periodical DLS measurements of a sample can show whether the particles aggregate over time by seeing whether the hydrodynamic radius of the particle increases.

5. layophilic , those who have affinity towards medium

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2. [5 points] If a cube of 1 mm side is divided into 1 nm-sized cubes, the total

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