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Σχήµα 2. Σχηµατική αναπαράσταση της αυτο-οργάνωσης σε δενδριµερή πολυφαινυλενίων µε πολυ(ε-καρβοβενζοξυ-Lλυσίνη) (PZLL). Στο σχήµα αριστερά το πολυπεπτίδιο έχει σχετικά µικρό βαθµό πολυµερισµού (n
Viscoelastic Response of Micelles with Chemically Cross-linked Cores Pamvouxoglou A. 1,2* , Van Ruymbeke E. 2 , Petekidis G. 1,2 , Vlassopoulos D. 1,2 , Mountrichas G. 3 and Pispas S. 3 1 University of Crete, Department of Materials Science & Technology, Heraklion, Crete, Hellas 2 Foundation for Research & Technology, Institute of Electronic Structure & Laser, Heraklion, Crete, Hellas 3 Theoritical & Physical Chemistry Institute, National Hellenic Research Foundation, Athens, Hellas *pamvou@iesl.forth.gr The past decades, a lot of progress has been made in the understanding of the viscoelastic behaviour of concentrated polymer solutions and colloidal suspensions. Besides these two classes of materials, there exist intermediate situations which combine the existence of topological constraints and long-range interactions, leading to a different behaviour. Block copolymer micelles are a popular representative. Understanding the consequences of the interplay between polymer-like and colloid-like behaviour on the dynamic properties is of the great importance for the design of materials with desired properties. In the last few years there has been a lot of effort in characterizing suspensions of star-like micelles with a responsive fixed core which is chemically cross-linked. The reason is that solvent quality or temperature plays an important role in the dynamics and rheology of such soft colloids. By changing the quality of the solvent we can have in situ variation of the core size through an appropriate choice of the solvent and/or temperature [1]. Responsive cores alter the static and dynamic properties of the colloidal suspensions in a controlled way. In this work we investigated micelles with a fixed core (via crosslinking) which exhibits the above mentioned responsiveness while the system remains stable. A highly asymmetric PS – PI block copolymer micelle consisting of polyisoprene (9% PI) cross-linked core and polystyrene (91% PS) hairs (shell) was used as model responsive soft colloids, where the core swelling can be tuned by changing solvent quality [1]. Dynamic and static light scattering measurements were used to study the dynamics of the micelles and the size. The study was carried out in dioctyl – phthalate (DOP) which is theta for polystyrene at 22 o C [2] and for polyisoprene at 25 o C [3]. The effect of DOP solvent in our system was to swell the micelle up to 170 nm at 80 o C when at 20 o C is almost 95 nm. Our primary goal was to investigate the concentration and temperature dependence of the linear viscoelastic properties. Specifically we investigated the dependence of the relative on the effective volume fraction in good solvent and compared it with linear and star polymers. Below 10% wt our system exhibited a liquid-like (Newtonian) behavior and as the concentration increased (20% wt) it became viscoelastic (see figure 1). Evidence of core deswelling is found in the nonmonotonic dependence of the relative viscosity with the effective volume fraction. The response of these micelles with long hairy corona was dominated by their polymeric nature (see figure 2). The dependence of the relative viscosity on φ eff was different depending on whether it was tuned by increasing the temperature or by increasing the mass concentration, suggesting that the micelles have different effective interactions in the two cases. G' ( ) , G" ( ) (Pa) 10 3 10 2 10 1 10 0 Concentration 20 % wt 2.65 % wt 10 -1 η 0 /η s T 3 PMMA in Decalin (640 nm) T 10 5 Star 32/80 2 Star 64/07 Star 128/07 10 4 Star 128/80 linear polymer Eintein's equation 10 3 1 % wt 2,65 % wt 5.08 % wt 10 2 10.2 % wt 20 % wt 10 1 T 1 10 -2 10 -2 10 -1 10 0 10 1 10 2 ϖ (rad/s) 10 0 10 -1 10 0 10 1 φ eff =c/c* Figure 1: Dynamic frequency sweep tests at 2 different concentrations (2.65% and 20% wt) at 20 o C for PS-PI. All strains are in the linear regime. Figure 2: Relative viscosity with the effective volume fraction for spheres, stars, linear polymers and star-like micelles. Our experimental data from PS-PI are with red color. T 1 , T 2 , and T 3 are the temperatures 20 o , 35 o and 50 o C respectively. 149
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XXIII ΠΑΝΕΛΛΗΝΙΟ ΣΥΝΕ
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Κοιτώντας τα πρακτ
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ΕΠΙΤΡΟΠΕΣ Οργανωτι
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ΠΡΟΓΡΑΜΜΑ ΣΥΝΕΔΡΙΟ
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21. Οργανικά τρανζίσ
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15:30 15:45 16:00 16:15 16:30 16:45
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41. Modeling and quantitative phase
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Ανοιχτή Συνεδρία «
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«NανοΥλικά και Νανο
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New materials and MOS device concep
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Reliability Characteristics of Rare
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Ο λόγος των ταχυτήτ
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Thus the mean R In-In is expected t
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FIG 1. Schematic representation of
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με 0.80 eV στη διεπιφά
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Εντοπισµός Φορέων
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Παρασκευή και Xαρακ
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Electrical Spin Injection from Fe i
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Electrical Spin Injection of Spin-P
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References [1] CH Lee, J. Meteer, V
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Σχήμα 1: Φωτογραφία
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SEM Image Layout Simulation Εικ
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Μελέτη Ατελειών Σε
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Facet-Stress-Driven Ordering in SiG
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νανοκρυσταλλίτης (a
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Σχήµα 1. Εικόνες περ
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Σχήµα 1. Εικόνες περ
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Οι δομές που αναπτύ
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Raman Intensity (10 -50 cm 3 ) 1,2
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Μελέτη της Επίδρασ
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Annealing Induced Dissociation of N
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`Εναπόθεση με Παλμι
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Μελέτη της Χημείας
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Ανάπτυξη Νέων Μεσο
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Application of Thermal Quadrupoles
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Στοχαστική προσομο
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Νανοτραχύτητα κατά
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Ευαισθησία και Δια
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Optical Properties of CuIn 1-x Ga x
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ανοπτημένο με λέιζ
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Στο σχήμα 3 φαίνοντ
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Id (mA) -0,3 -0,2 -0,1 Vg=0 Vg=-1 V
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Strained-Si Si 1-x Ge x graded Si 1
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Fig. 1. Laser mask movement during
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forwarded to the back interface dur
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Σχήμα 2: Εκθετική εξ
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V th (V) G m,max /G m,max0 (%) I d
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C/ C ox 1,0 0,8 0,6 0,4 0,2 0,0 -4
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και Ta 2 O 5 , των οποίω
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κατασκευή της. Η πα
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ΔP (mW) 12 10 8 6 4 2 0 0 500 1000
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υπολογίσουμε θεωρη
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Σχήμα 2 Σύστημα ηλε
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Μελέτη των Μηχανισ
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Ανάπτυξη και Μελέτ
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Structure and Magnetic Properties o
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Δομή και Μαγνητικέ
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Μετρήσεις Ειδικής
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Further, almost all of the observed
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Page 123 and 124: ΜΕΛΕΤΗ ΤΟΥ ΦΑΙΝΟΜΕ
Page 125 and 126: Νέοι Εξαφερίτες Ba µ
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Page 129 and 130: Magnetic Phase Transition in Synthe
Page 131 and 132: Συσχέτιση πλαστική
Page 133 and 134: Μετασχηματισμοί φά
Page 135 and 136: Μελέτη της Επίδρασ
Page 137 and 138: Resonant Spin Transfer Torque in Do
Page 139 and 140: 3 η Προφορική Συνεδ
Page 141 and 142: technology, and e-beam lithography.
Page 143 and 144: ecause it reduces the calculation o
Page 145 and 146: Υπολογισμός Υψηλής
Page 147 and 148: The thermodynamic average is obtain
Page 149 and 150: ΑΠΟΤΕΛΕΣΜΑΤΑ Στην
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Page 153 and 154: Combining Magnetism and Ferroelectr
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Page 157 and 158: Our scheme is illustrated in Fig. 1
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Page 167 and 168: P P P P P power P copolymers P and
Page 169: Αυτο-οργάνωση και Μ
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Page 175 and 176: Light - induced Reversible Hydrophi
Page 177 and 178: Οι παραπάνω τρεις κ
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Page 185 and 186: Structure and Dynamics of Branched
Page 187 and 188: ∆οµή και ∆υναµική
Page 189 and 190: Επίδραση της Τοπολ
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Page 193 and 194: Figure 3. Generation 4 PAMAM-H 2 O
Page 195 and 196: Από όλα τα παραπάνω
Page 197 and 198: Το PHEGMA είναι άμορφο
Page 199 and 200: PS HAuCl 4 P2VP Ion loading PSP2VP
Page 201 and 202: The nonlinear optical response of A
Page 203 and 204: νανοσωµατίδια. Όπω
Page 205 and 206: Bioactive Glass/Nanodiamonds system
Page 207 and 208: Energy Loss Rates of Hot Electrons
Page 209 and 210: Σύνθεση και Χαρακτ
Page 211 and 212: μπορεί να ερμηνευτ
Page 213 and 214: Nανοσυνθέτα Εποξει
Page 215 and 216: [1] S. Iijima, Nature 354, 56 (1991
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1.0 Reflectance 1.1 1.0 0.9 0.8 0.7
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στο συντελεστή διέ
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¿ÔÖØÑÒØÓÐØÖÐÒÒÖÒ¸
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Συναπόθεση Cr - Ni σε
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Investigation of the Structural, Mo
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Modification of Perlite Cementitiou
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Templated Sol-Gel Synthesis Of TiO
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Παρασκευή Υμενίων
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Preparation of YSZ Solid Electrolyt
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Σύνθεση, Ανισοτροπ
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Μελέτη ανθρώπινων
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Local Coordination of Zn and Fe in
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Επίδραση της Προσθ
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Αλκαλική Σύνθεση κ
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Μηχανικές Iδιότητε
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The Influence of Thermal Aging on t
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Modeling and quantitative phase ana
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Συμβολή στη Συντήρ
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Κρυσταλλική Συµπερ
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Σύνθεση Στερεών ∆ι
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Fabrication and Characterization of
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∆ιερεύνηση δυνατό
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Συγκριτική αξιολόγ
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6 η Προφορική Συνεδ
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Ηλεκτρομαγνητική Α
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Φασματοσκοπική Μελ
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Thermal and Electrical Properties o
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Structure, Mechanical, and Optoelec
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Designing Nanoporous Materials for
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This program was developed to serve
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Νέα Αυτό-οργανούμε
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A Physical Model to Interpret the E
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FIR study of Ag x (As 33 S 33 Se 33
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Mελέτη Μεικτών Γυαλ
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The Structural Role of Fe and Zn in
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ΕΥΡΕΤΗΡΙΟ ΣΥΓΓΡΑΦΕ
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Κομπίτσας Μ…………
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ΕΥΡΕΤΗΡΙΟ ΣΥΓΓΡΑΦΕ
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W Watson I.M………………4 Weg
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xxiii ÏÎ±Î½ÎµÎ»Î»Î·Î½Î¹Î¿ ÏÏ Î½ÎµÎ´ÏÎ¹Î¿ ÏÏ ÏÎ¹ÎºÎ·Ï ÏÏÎµÏÎµÎ±Ï ÎºÎ±ÏÎ±ÏÏÎ±ÏÎ·Ï & ÎµÏÎ¹ÏÏÎ·Î¼Î·Ï ...

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xxiii ÏÎ±Î½ÎµÎ»Î»Î·Î½Î¹Î¿ ÏÏÎ½ÎµÎ´ÏÎ¹Î¿ ÏÏÏÎ¹ÎºÎ·Ï ÏÏÎµÏÎµÎ±Ï ÎºÎ±ÏÎ±ÏÏÎ±ÏÎ·Ï & ÎµÏÎ¹ÏÏÎ·Î¼Î·Ï ...