This presentation slide is prepared by myself. Information is collected from books, google and other relevant sources. All right reserved my author. Thanks.
Mattingly "AI & Prompt Design: The Basics of Prompt Design"
Cellulose presentation
1. Gazi A Rahman Nahid
Student ID: 120537
4th year, 1st term
Forestry and Wood Technology Discipline
Khulna University
2. Cellulose
Some Terminology
Formation of cellulose
Structure of cellulose
Properties of cellulose
Use of cellulose
Gazi A Rahman Nahid (120537),FWT, KU
3. 𝜷,1-4, D-Anhydro-glucopyranose units
Liner homopolymer of Glucose
Polysaccharide
Molecular formula (C6H10O5 )n.
Carbohydrate, composed of
Carbon, Oxygen and Hydrogen
Discovered in 1838 by a
French chemist.
“Anselm Payen”
Gazi A Rahman Nahid (120537),FWT, KU
4. Naturally occurring, most abundant organic substance
ever
Main structural component of the cell wall
Reinforcing material in wood
Most promising carbon sequestering device
The purest form is cotton fiber (about 98%)
Gazi A Rahman Nahid (120537),FWT, KU
5. Glucose
Simple Monosaccharide
Pyranosic structure
Hexose ( 6 carbon), also aldose( -CHO)
Molecular formula is C6H12O6
Gazi A Rahman Nahid (120537),FWT, KU
7. Gazi A Rahman Nahid (120537),FWT, KU
Pyranose
Any cyclic isomer, has a five carbons and one oxygen in a ring
of six atoms
Cellobiose
Cellobiose consists of two glucose molecules linked by a
β(1→4) bond
8.
Gazi A Rahman Nahid (120537),FWT, KU
6
1
23
4 1
23
4
5 5
H2
O
O
H2
O
O
O O
1,4 D Glycopyranosic bond
𝜷,1-4, D-Anhydroglucopyranose units linked by (1,4)-glycosidic bonds
Cellulose synthase enzyme
9. Molecular Structure
Crystal Structure
Fibrillar Structure
Capillary Structure
Gazi A Rahman Nahid (120537),FWT, KU
10. Unbranched chained polymer
High molecular composition
DP is 8000-10000
Distance between C-C and C-O is 1.9 to 2.1 A°
(1A° = 10 -10 m)
Gazi A Rahman Nahid (120537),FWT, KU
11. Molecules can crystallize into different polymorphic
forms.
Only first four are of textile interest.
Length of cellulose crystal is 10.3 A°
Gazi A Rahman Nahid (120537),FWT, KU
12. Individual cellulose molecules are linked together to
form an elementary fibril.
Dimensions: about 4nm wide, 3 nm thick and 10nm
long.
Gazi A Rahman Nahid (120537),FWT, KU
13. Capillary pores are opened up on exposure of solvent.
Diameter ranges from 20nm to 10 micron.
Surface area approximately 200sq.cm per gram for cotton
fibre.
Gazi A Rahman Nahid (120537),FWT, KU
15. Crystalline region: Intra and Inter molecular bonding is so
strong. Do not absorb much moisture
Amorphous region: Bonding is week. Absorb too much
moisture
Gazi A Rahman Nahid (120537),FWT, KU
16. Appearance : Whitish in color
Density : 1.5 g/cm3
Melting point : 260–270 °C; 500–518 °F;
533–543 K to decompose
Std enthalpy of formation : −963 KJ/mol
Std enthalpy of combustion : −2828 KJ/mol
Solubility in water : None
Moisture absorption : 8-14% moisture, very slowly
Reacts with strong base
Gazi A Rahman Nahid (120537),FWT, KU
17. Cotton: composed of 87 -90% cellulose with the cotton fibers
containing polymer chains
Pharmaceuticals: Medicines are derived from plants cellulose,
cellulose acetate etc.
Cellophane: Can be obtained when a viscous cellulose reacts with
acid (sulfuric acid)
Bomb: Cellulose trinitrate is used as a propellant for bullets due the
fact that nitrate –OH group can be explosive
Energy Drinks: Glucuronolacton, vitamins, and carbohydrates
Industrial Sugar, biofuel production, using oil production,
ester production
Gazi A Rahman Nahid (120537),FWT, KU