Deck A

Question 1

Self-Assembly

Answer 1

the spontaneous formation of organized structures from many discrete components that interact with one another directly and/or indirectly through their environment

Question 2

5 types of self-assembly (number line)

Answer 2

atom, molecular, colloidal, biological interfacial

Question 3

Dendrimers

Answer 3

highly branched with a central core, branches and exterior surfacee with functional surface groups

Question 4

LBL

Answer 4

layer by layer stacking of polymers

Question 5

Amphiphilic molecules

Answer 5

have an affinity for two different types of environments.

Question 6

PEG vs. PEO

Answer 6

The number of monomer subunits ‘O’ has more

Question 7

HLB

Answer 7

hydrophilic-lipophilic balance only nonionic surfactants 20*(M_h/M) moleculcar mass of hyrophillic/total

Question 8

Surfactant

Answer 8

surface active agent

Question 9

5 general types of surfactants

Answer 9

Cationic, Anionic, Nonionic, Zwitterionic, Gemini

Question 10

Cationic uses

Answer 10

textile, cosmetics, libricating, corrosion inhibitor, pesticide, ore floatation

Question 11

Anionic uses

Answer 11

soaps, detergents, toothpaste, hand wash, bath gels, shampoo

Question 12

Zwitterionic uses

Answer 12

fabric softeners, bacteriacides

Question 13

Block copolymer advantages

Answer 13

greater flexibility for controlling micellar structure and functionality through choices of polymer composition, architecture, molecular weight and monomer chemistry

Question 14

Most common block copolymer

Answer 14

PEG and PEO (Pluronic)

Question 15

Forces acting on self-assembly (3)

Answer 15

Attractive driving, Repulsive opposition, Directional/Functional

Question 16

Force Balance Equation

Answer 16

f_p|U_AP+U_RP|

Question 17

Type 1 Self-Assembly

Answer 17

Only primary attractive and repulsive forces.

Formation of micelles, vesicles or microemulsions

Question 18

Type 2 Self-Assembly…Type 3

Answer 18

Primary and Secondary attractive and repulsive forces…and tertiary and above forces

Question 19

Type 4 Self-Assembly

Answer 19

External forces involved and includes all other types

Question 20

External forces involved in self-assembly

Answer 20

magnetic, electric, capillary, gravity, substrate interactions flow stress

Question 21

Force Balances

Answer 21

U_total ~= 0 and U_ext=0 – thermodynamically driven
U_total < 0 and U_ext=0 – kinetically driven
U_total > 0 and U_ext=0 – not possible

Question 22

Thermodynamics vs. Kinetics

Force Balance

Answer 22

Thermodynamics requires a greater activation energy but also has greater Gibbs free energy.