ionic polysaccharides, solubility, interactions with ... · ionic polysaccharides, solubility,...
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Ionic polysaccharides, solubility, interactions with surfactants, particle formation, and deposition Björn Lindman, Tommy Nylander, Maria Miguel and Lennart Piculell Physical Chemistry 1, Lund University, PO Box 124, 221 00 Lund, Sweden and Chemistry Department, Coimbra University, Portugal [email protected]
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Polymer + Surfactant ubiquitous in formulations
1. Complementary Cleaning + thickening, stabilisation, redeposition
2. Synergistic Thickening (general) Deposition (hair-care)
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Polymer-Surfactant interactions may be
1. Repulsive Homogeneous solution
Segregative phase separation
2. Attractive (electrostatic, hydrophobic)
Complex formation Associative phase separation
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POLYELECTROLYTE EFFECTS
• A polyelectrolyte in aqueous solution dissociates into 1 polyion and n counterions; typically n >> 1
• a large no. of particles: large ΔSmix
• thus high solubility
• If the counterions mix into a phase, the polyion has to follow (condition of electroneutrality)
• Divalent and multivalent counterions different
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Polymer solutions (as rheological modifiers)
Na Cl
Entanglements Extension
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Spherical Surfactant Micelle
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Counterion entropy
+
+
+
+
+
+
+
Counterions
+ + +
+ +
+
+ +
+ +
+
+ + +
+ + +
+ +
+ +
+
- -
- - -
- - -
- - - -
- -
- - - - -
- -
- 60-80% Counterion Binding
CSURFACE >> CBULK ΔS < 0
Unfavorable ΔG > 0 High CMC
Salt decreases CMC
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Network formation and gelation
• A gel contains at least two components, one solid-like and one liquid-like, where both are continuous throughout the gel.
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What are polyelectrolyte gels?
• Polymer network with charged groups: counterion entropy gives swelling (up to 1000 times or more)
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Counterion entropy gives repulsion between surfaces
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Polyelectrolyte adsorption ���Case I: Polymer and surface have opposite charge
Add salt
Entropic gain of counterions
Adsorption���decreases
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a
Case II: Polymer and surface have the same charge
+
+
+ - - -
+ + + - - - - - - - - - - - - - - - -
+
+ +
-
-
-
+ + + -
- -
+ + +
- -
+
+ + -
-
+ +
+
+
+ -
Add salt Adsorption increases
+ -
+
+
+ - - -
+ + +
- - - - - - - - + + +
- - - - - - - -
Entropic loss of counterions + -
+ -
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Solvent Polymer
Surface
Aqueous systems: Adsorption occurs since water interacts unfavorably with polymer (clouding polymer) or surface (hydrophobic surface)
Solvency effects
Deposition/adsorption depends on an interplay between different interactions
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In a mixed solution
Interactions between cosolutes are:
Repulsive (most common)
or
Attractive (electrostatic, hydrophobic - not hydrogen-bonding in water)
Depending on interaction
Segregation
Association, or
Miscibility
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An amphiphilic polymer: DNA Self-assembly: Double Helix
Driven by hydrophobic association not H-bonding. Opposed by electrostatic repulsion: Limits self-assembly. (Dissociation without electrolyte)
Another controversy: Cellulose
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Polymer-Surfactant Association: pearl-necklace model
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• Cooperativity
Polymer-Surfactant Interaction
• Surfactant micellization induced by polymer
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Hydrophobic association is always essential to the interaction
When do surfactants bind to polymers?
Ionic Surfactants
self-assembly induced by polymer
mixed micellization
All Surfactants Hydrophobically modified polymers
Oppositely charged polymers
Non-ionic polymers
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Experimental cmc and cac data
Cac for different polyelectrolytes and alkyltrimethylammonium bromides
For nonionic P cac much larger: lowering of cmc up to a factor of 5
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Network formation and gelation
• A gel contains at least two components, one solid-like and one liquid-like, where both are continuous throughout the gel.
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What are polyelectrolyte gels?
• Polymer network with charged groups
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polymer network polymer network + hard spheres
Separation of the different contributions to the pressure
+ hard spheres
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polymer network + hard spheres
Polymer network + hard spheres + charges
Separation of the different contributions to the pressure
+ charges
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polymer network polymer network + hard spheres
Polymer network + hard spheres + charges
Separation of the different contributions to the pressure
+ hard spheres
+ charges
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0.0
0.50
1.0
1.5
2.0
0.0001 0.001 0.01 0.1
P/! k
BT
"/2
Result
polymer network
polymer network + hard spheres Polymer network
+ hard spheres + charges
network packing fraction
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0.0
0.50
1.0
1.5
2.0
0.0001 0.001 0.01 0.1
P/! k
BT
"/2
Result
polymer network
polymer network + hard spheres Polymer network
+ hard spheres + charges
network packing fraction
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0.0
0.50
1.0
1.5
2.0
0.0001 0.001 0.01 0.1
P/! k
BT
"/2
Result
polymer network
polymer network + hard spheres Polymer network
+ hard spheres + charges
network packing fraction
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• Due to the requirement of macroscopic electro-neutrality,
counterions are confined to the network 2 contributions to the pressure
• Osmotic pressure exerted by the confined ions • Coulomb interaction (attractive and repulsive)
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• Due to the requirement of macroscopic electro-neutrality, counterions are confined to the network 2 contributions to the pressure
• Osmotic pressure exerted by the confined ions • Coulomb interaction (attractive and repulsive)
• Separation of the two contributions Confined counterions increase the pressure Coulomb interactions reduce the pressure
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Gel Swelling Experiment: How & Why
=> Potential ”responsive gels” (drug delivery, water retention…) => Info on interactions between gel & additive
water water + additive
water + more additive
• Make gel pieces of cross-linked polymer • Immerse gel pieces in series of solutions with increasing conc of additive
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Polymers Used in Gels Commercial cellulose derivatives cross-linked by divinylsulfone • HEC (hydroxyethyl cellulose) • HMHEC • cat-HEC (”JR400”) • cat-HMHEC (”LM200”)
O H Cl
C H 3
C H 3 R N +
O C H 2 O C H 2 C H 2 O H
O H O H O
O H O H O
C H 2 O ( C H 2 C H 2 O ) 2 C H 2 C H C H 2
τ 1-τ JR-400 : R=CH 3 τ =45mol% Mw ≈ 500000 LM-200 : R=C 12 H 25 τ =9mol% Mw ≈ 100000
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General Swelling Isotherm for ”Weakly Hydrophobic” Nonionic Gel
with Ionic Surfactant
5 10 15 20 25 30 35
0.1 1 10 100
V/V 0
C f,SDS 0 cac
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HEC gels swollen in alkyl sulfate solutions Sjöström & Piculell Langmuir 17(2001)3836
Gel Swelling Experiments Detect Surfactant Binding
0
50
100
150
200
0.1 1 10 100
V /
m (
ml/g
)
c (mM)
SHS STS SDS SDeS SOS
0
CMC:
=> HEC binds alkyl sulfates with > 8 carbon tails
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Cat-HEC Gels + Different Anionic Surfactants
10
100
1000
0.0001 0.001 0.01 0.1 1 10
V /
m (
ml/g
)
c (mM) 0
STS SDS SD(EO)2S CMC:
Sjöström & Piculell Colloids Surf A 183-185 (2001) 429"
• Collapse & redissolution • Two CAC:s!? • Both correlate with CMC => both reflect surfactant self-assembly
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Polysaccharide-surfactant systems. Phase separation
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SEGREGATING POLYMER/SURFACTANT MIXTURES
• In general (i.e,. in absence of electrostatic or hydrophobic attractions), effective repulsion between a polymer and a surfactant micelle is expected
• Since a surfactant micelle is effectively a polymer, repulsion should lead to a segregative phase separation, as for mixtures of dissimilar polymers
anionic + anionic nonionic + nonionic
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Nonionic polymer + nonionic surfactant Segregation
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MIXTURES OF OPPOSITELY CHARGED POLYELECTROLYTE + SURFACTANT:
ASSOCIATIVE PHASE SEPARATION
• For intrinsically hydrophilic polyions, the association is driven only by electrostatic interactions
• Close analogy to polyelectrolyte complexes
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Anionic polysaccharide + Cationic surfactant
Association
Nature of conc phase: conc soln/gel, liq crystal, solid crystal
Generic phase diagram for oppositely charged mixtures
Thalberg et al.
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Thalberg et al.
Effect of salt on polyelectrolyte + ionic surfactant
Low salt Association
Intermediate salt Miscibility
High salt Segregation
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• First increase in turbidity due to phase separation above CAC
• Then onset of redissolution at free surfactant concentration < CMC
0
0.02
0.04
0.06
0.08
0.1
0.001 0.01 0.1 1 10 100
Abso
rban
ce
SDS concentration (mM)SDS concentration (mM)
1φ
2φ
1φ
Abs
orba
nce
at
λ =
500
nm
cac cac2 1:1
Phase separation and redissolution by adding SDS to dilute solution of cat-HEC
(CH2CH2O)n-CH2CHOHCH2N+(CH3)3Cl-
O
OR'
H
H
OR'
H
H
R'O
H
OO
HO
R'O
H
HOR'
H
H
O
R
n
(CH2CH2O)n-OHR=H or R'=H or
100ppm “UCARE LR-30M”
A.V. Svensson, L. Huang, E.S. Johnson, T. Nylander, L. Piculell, Appl. Mat. & Int. 1 (2009) 2431
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Solvent Polymer
Surface
Aqueous systems: Adsorption occurs since water interacts unfavorably with polymer (clouding polymer) or surface (hydrophobic surface)
Solvency effects
Deposition/adsorption depends on an interplay between different interactions
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The poorer the solvent the better the adsorption
���Solvency depends on: ���
polymer polarity���molecular weight���
complexation ���temperature
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The influence of the solvent
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Development of modern shampoo
the best way to keep damage to a minimum is to condition regularly and thoroughly. This helps to keep the cuticle intact, lower friction and reduce static charge on the hair
shampoos are simplicity out of complexity
What is in a shampoo? Cleansing agents: surfactants: anionic, amphoteric, nonionic Conditioning agents: silicone oils, cationic polymers Functional additives: thickeners, pH controllers Preservatives: sodium benzoate, parabens, EDTA etc. Aesthetic additives: colors, perfumes, pearlescing agents Medically active ingredients: zinc pyrithione, panthenol
www.pg.com
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MIXTURES OF OPPOSITELY CHARGED POLYELECTROLYTE + SURFACTANT:
ASSOCIATIVE PHASE SEPARATION
How to eliminate/reduce phase separation?
• 1. Electrolyte
• 2. High concentration
• 3. Hydrophobic modification of polymer
• 4. Excess of one component (surfactant)
Implications for stability of formulations and deposition
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H2O
P+S- solution
P+
S-
S-
+
Polymer-surfactant applications: implications for haircare of solvency
H2O
P+S- precipitate
S-
H2O P+
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• A conventional polyelectrolyte-surfactant mixture in water is a four-component system • A full description requires a 3D phase diagram
polyelectrolyte
surfactant complex salt
simple salt
water
x
.
.
Full phase behaviour complex
K. Thalberg et al. J. Phys. Chem. 95 (1991) 6004
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OPPOSITELY CHARGED MIXTURES: TWO ALTERNATIVE REPRESENTATIONS
conventional mixing plane alternative mixing plane
Stoichiometric mixtures belong to both mixing planes
Salt conc a hidden variable
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Deposition of polyion-surfactant complexes by dilution: A one-step procedure
dilution
• Start with re-dissolved soluble complex (excess surfactant) • Dilute (rinse with water) => surfactant leaves the complex • An insoluble complex separates out => one-step depositon
Used extensively in personal care, fabric care to deposit polyion-surfactant complexes & co-deposit various
“benefit agents” (often colloidal particles)
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Phase separation, surface deposition and "redissolution" of complexes of polymer and surfactant carrying opposite charge
In situ monitoring of deposition by ellipsometry confirms phase diagram approach
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Rinsing of adsorbed polymer/SDS layers on silica
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time [sec]
adso
rbed
am
ount
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m2 ]
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1.8
0.001 0.01 0.1 1 10SDS [mM]
adso
rbed
am
ount
[m
g/m
2 ] 2ƒÓ
Reference Adsorption of JR-400/SDS complexes from pre-mixed solutions
Rinsing was started (t=1000)
Rinsing was started after adsorption of the complex from pre-mixed solution reached steady state
- Deposition on rinsing: For the complexes which were formed in post-precipitation region, the adsorbed amount jumped up on rinsing
Effect of rinsing (10mM NaCl) on adsorption
5mM SDS 10mM SDS
0.06mM SDS 0.006mM SDS
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Time [sec.]
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orbe
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ount
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m2]
Effect of salt on rinsing on adsorbed polymer/SDS layers
on hydrophobized silica
a
b
c
The complexes adsorbed from mixed polymer (100 ppm)/surfactant (5 mM) solutions and rinsing was started at t = 1000 sec
(a) adsorption was carried out in water followed by rinsing with water (b) adsorption was carried out in 10 mM NaCl followed by rinsing with water (c) adsorption was carried out in 10 mM NaCl followed by rinsing with 10 mM NaCl
Less deposition with salt
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Rinsing of adsorbed HMP+/SDS layers on silica
Method:
Polymer JR-400 (100ppm) and SDS premixed solution was injected
After adsorption reached plateau, rinsing with 10mM NaCl was started (t=1000)
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time [sec]
adso
rbed
am
ount
[mg/
m2 ]
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0.001 0.01 0.1 1 10
SDS [mM]
adso
rbed
am
ount
[mg/
m2 ] 2!
Effect of rinsing (10mM NaCl) on adsorption Reference
Adsorption of HMP/SDS complexes from pre-mixed solutions
Rinsing was started (t=1000)
Only weak additional adsorption of LM-200/SDS complexes in the post-precipitation region as opposed to JR-400/SDS complexes
Rinsing was started after adsorption of the complex from pre-mixed solution reached steady state
5mM SDS 10mM SDS
0.06mM SDS 0.006mM SDS
Lower depostion with hydrophobically modifed polymer: Higher solubility of LM-200/SDS complex. See phase diagram
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COACERVATION in
HMPE + OPPOSITELY CHARGED SURFACTANT
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PATH DEPENDENCE OF ADSORPTION
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ount
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adsorbed layer thickness, Å
1 mM NaCl
1 mM NaCl100 mM NaCl
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Time, h
100 mM NaCl100 mM NaCl1mM NaCl H
2O
adso
rbed
am
ount
!, m
g·m
-2 adsorbed layer thickness, Å
Polyelectrolyte alone, cyclic changes in salt concentration
• no relaxation of the adsorbed layer when ionic strength decreases • once polymer (40DT) adsorbs, it never deattaches the surface
+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
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CO-ADSORPTION OF DT AND SDS
Adsorption from premixed solutions. Path dependence of co-adsorption of 80DT (50 ppm) and SDS (0.1 mM) versus variation in salt concentration
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Time, h
adso
rbed
am
ount
!, m
g·m
-2adsorbed layer thickness, Å
1 mM NaCl100 mM NaCl
1 mM NaCl
rinsingI II III
after rinsing, the amount of DT left on the surface is much higher than upon direct route of adsorption, without SDS
(rinsing removes surfactant)
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adso
rbed
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ount
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-2adsorbed layer thickness, Å
100 mM NaCl
1 mM NaCl
100 mM NaClrinsing
I II III
• Highly irreversible behaviour • Possibility to tune the adsorption of
polyamphiphiles by the transient exposure to surfactants?
after rinsing, the amount of 80 DT left on the surface is much lower than upon direct route of adsorption, without SDS
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Polyelectrolyte nanocapsules through LbL (Layer-by-Layer)
deposition on vesicular templates
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Polyelectrolyte assembly on colloidal particles
Core-shell particles Hollow capsules
The versatility of LbL has allowed a broad range of material to be assembled on various substrates. The resulting multilayer properties such as composition, thickness and permeability depend on the type of species adsorbed, the number of layers and the conditions of the assembly process.
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Targets: ������
hollow capsule production by means of a different and mild protocol. production of hollow capsules with dimensions in the submicrometer scale.
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Matherials: Template and Polymers
Alginate and Chitosan
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LbL assembly on vesicles: core-shell nanoparticles
Surface charge Size and Shape
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Making hollow nanocapsules
Vesicle-to-micelle transition
Cuomo, F., Lopez, F., Miguel M.G., Lindman, B., Vesicle-templated Layer by Layer assembly for the production of nanocapsules, Langmuir 2010, vol. 26; p.10555-10560.
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Making hollow nanocapsules
size distributions before and after the addition of tX, and after the dialysis. SEM observations prove the capsule
integrity after the dialysis.
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Message
• Counterion control (higher valency different) • Electrolyte decreases counterion entropy • Balance between electrostatics and hydrophobic
interactions • Solvency effects