A5043864779- Hydrogels: synthesis, properties, applications
- Advanced Polymer Synthesis and Characterization
- Surfactants and Colloidal Systems
- Advanced Materials and Mechanics
- Polymer composites and self-healing
- Advanced Sensor and Energy Harvesting Materials
- Polymer Nanocomposites and Properties
- Silk-based biomaterials and applications
- Photopolymerization techniques and applications
- Liquid Crystal Research Advancements
- biodegradable polymer synthesis and properties
- Electrostatics and Colloid Interactions
- Surface Modification and Superhydrophobicity
- Mesoporous Materials and Catalysis
- Conducting polymers and applications
- Advanced Theoretical and Applied Studies in Material Sciences and Geometry
- Aerogels and thermal insulation
- Electrospun Nanofibers in Biomedical Applications
- Polymer Nanocomposite Synthesis and Irradiation
- Synthesis and properties of polymers
- Advanced Physical and Chemical Molecular Interactions
- Polymer Surface Interaction Studies
- Bone Tissue Engineering Materials
- DNA and Nucleic Acid Chemistry
- Photochemistry and Electron Transfer Studies
Istanbul Technical University
2016-2025
Hacettepe University
2022
TÜBİTAK Marmara Research Center
1992-2021
Orient-Institut Istanbul
2018
Helmholtz-Zentrum Berlin für Materialien und Energie
2016
Marmara University
2008
Clausthal University of Technology
2004-2007
Kocaeli Üniversitesi
1996-2007
University of Colorado Boulder
2005-2006
University of Colorado Health
2006
Large hydrophobic monomers stearyl methacrylate (C18) and dococyl acrylate (C22) could be copolymerized with the hydrophilic monomer acrylamide in a micellar solution of sodium dodecyl sulfate (SDS). This was achieved by addition salt (NaCl) into reaction solution. Salt leads to growth and, hence, solubilization hydrophobes within SDS micelles. The hydrogels thus obtained without chemical cross-linker exhibit unique properties due strong interactions. They can only dissolved solutions...
The free-radical polymerization of acrylamide in aqueous clay dispersions and the structure resulting polymer−clay nanocomposite hydrogels have been investigated by rheometry using oscillatory deformation tests. Laponite was used as particles hydrogel preparation. reactions were carried out with without presence chemical cross-linker N,N'-methylenebis(acrylamide) (BAAm). In absence BAAm, increasing concentration from 0.2 to 7% results 3 orders magnitude increase elastic modulus G' hydrogels....
Ecological disasters resulting from oil spills have created a great need to find more efficient materials for spill cleanup. This research highlights the use of novel macroporous polymeric material based on butyl rubber (BR) as sorbent in an The sorption capacity BR crude and petroleum products is 15−23 g g−1 compared value 10−16 obtained using nonwoven polypropylene (PP), widely used commercial sorbent. reusable after simple squeezing its continuous 7.6 each cycle, about 3 times PP sorbents...
A promising strategy to design synthetic hydrogels with the ability self-heal is substitute covalently cross-linked polymer chains by supramolecular ones. Although generally exhibit rapid self-healing without need for any stimulus, they suffer from low mechanical strength which prevents them stress-bearing applications. Here, we describe a novel way production of shape memory behavior high tensile (0.7–1.7 MPa) and stretch at break (800–900%). Hydrophobically modified poly(acrylic acid)...
Polyacrylamide hydrogels formed via hydrophobic interactions between stearyl groups in aqueous micellar solution of sodium dodecyl sulfate (SDS) present two faces depending on which state they are. The gels containing SDS micelles exhibit, addition to the fast mode, a slow relaxation mode dynamic light scattering (DLS) and time-dependent elastic moduli, indicating temporary nature associations having lifetimes order seconds milliseconds. where had been removed after their preparation behave...
Additive manufacturing of smart materials that can be dynamically programmed with external stimuli is known as 4D printing. Among the printable materials, hydrogels are most extensively studied in various biomedical areas because their hierarchical structure, similarity to native human tissues, and supreme bioactivity. However, conventional suffer from poor mechanical properties, slow actuation speed, instability actuated shape. Herein, we present 4D-printed based on poly(acrylic acid)...
Silk fibroin cryogels with remarkable properties were obtained from frozen solutions (4.2-12.6%) at subzero temperatures between -5 and -22 °C. This was achieved by the addition of ethylene glycol diglycidyl ether (EGDE) into cryogelation system. EGDE triggers conformational transition random coil to β-sheet structure hence gelation. One unique features is their elasticity that allows them resist complete compression without any crack development, during which water inside cryogel removed....
We present here a synthetic strategy for the preparation of melt-processable shape-memory hydrogels with self-healing ability. The supramolecular hydrogel water content 60–80 wt % consists poly(acrylic acid) chains containing 20–50 mol crystallizable n-octadecyl acrylate (C18A) segments together surfactant micelles. key our approach to render is absence chemical cross-links and presence At temperatures above melting temperature Tm crystalline domains alkyl side chains, liquefies due micelles...
Understanding the nanoscale structure and dynamics of supramolecular hydrogels is essential for exploiting their self-healing mechanisms. We describe here nanostructural evolution mechanism formed from in situ generated hydrophobically modified hydrophilic polymers wormlike sodium dodecyl sulfate (SDS) micelles. observe a conformational transition SDS micelles upon addition hydrophobic as well monomers. Several hundred nanometer long completely disappear after monomer addition, favor...
Poly(2-acrylamido-2-methyl-1-propanesulfonic acid) (PAMPS) hydrogels are attractive materials for various application areas due to their pH-independent large swelling capacities. However, covalently cross-linked network structure leads a brittle behavior even at low strains. We present here the first time highly stretchable superabsorbent PAMPS formed via H-bonds entirely that stable in water. UV polymerization of AMPS aqueous solutions 23 ± 2 °C without chemical cross-linker produces with...
Acrylamide and N,N′-methylenebis (acrylamide) (AAm–Bis) copolymerization has been in-vestigated in water at a monomer concentration of 1.8 w/v%. Conversion pendant vinyl groups was measured as function the reaction time up to onset macrogelation. Experimental results indicate that 80% are consumed by cyclization reactions. When kept constant 1.8%, critical conversion gel point shows minimum 7.5 mol % Bits. The equilibrium degree swelling polyacrylamide (PAAm) gels is independent their...
A novel way for the production of shape memory hydrogels containing crystalline domains is described. Hydrogels were prepared by micellar copolymerization acrylic acid with hydrophobic comonomer n-octadecyl acrylate (C18) in an aqueous NaCl solution sodium dodecyl sulfate (SDS). The presence causes SDS micelles to grow and thus enables solubilization large amounts (16% w/v) C18 solution. DSC measurements show that swollen hydrogels, possessing 61–84% water, melt crystallize a change...