week 8 - guest Flashcards
1
Q
advantages: BIOCERAMICS
A
- wear resistance
- corrosion resistance
- easy/ cheap manufacture
2
Q
disadvantages: BIOCERAMICS
A
- brittle
- difficult/ costly manufacture
3
Q
applications: BIOCERAMICS
A
- bone and dental replacements
- drug delivery
- cancer treatment
4
Q
generations: BIOCERAMICS
A
- bioinert
- accepted, no interation - bioactive OR resorbable
- interaction - bioactive AND resorbable
- supporting full self-healing
5
Q
examples: BIOCERAMICS
A
Al2O3
- most widely used for technical ceramic applications
- cups/ heads in hip/knee implant
- -> high fracture toughness/ wear R/ corrosion R
- controlled drug delivery
- -> high SA, easy functionalisation
CaP-based
- similar to bonetooth mineral HA
- -> form stable interface, simulates and guide cell growth
6
Q
Piezoelectricity
A
Transformation of mechanical stress to electric potential
7
Q
Direct piezoeffect
A
mechanical stress to electric potential
8
Q
Indirect piezoeffect
A
electrical field into mechanical strain
9
Q
Piezoelectric graph
A
- graph image
- cofficient/ tensor (slope) = d
- components determines by crystal symmetry
10
Q
ex-vivo applications PIEZO
A
- motion/ vibration sensors
- energy harvesting
- buzzers
- ultrasound devices
11
Q
in vivo applications PIEZO
A
- sensing and monitoring
- energy harvesting
- temporary muscle function
- vibration damping
- cell stimulation and guidance
12
Q
cell stimulation and guidance applications
A
in vivo culturing
- medical treatment of degenerative diseases
in vivo cell stimulation
- auditory nerves - cochlear implants
- guided cell growth - scaffolds, implants
13
Q
Piezoelectric materials factors
A
- sufficient stimulus
- chemical stability
- mechanical compatibility
- microstructural compatibility
14
Q
- Sufficient stimulus
A
WHAT
15
Q
- Chemical stability
A
- no controlled solubility
- swelling/ loss of mechanical integrity
- changes to surface chemistry
