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Marek W. Urban - One of the best experts on this subject based on the ideXlab platform.
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stimuli responsive Polymer nano science shape anisotropy responsiveness applications
Progress in Polymer Science, 2017Co-Authors: Marek W. UrbanAbstract:Abstract Polymeric nanomaterials capable of altering volume, color, or shape have attracted significant scientific interests as these materials become increasingly critical in advancing unique technological developments. Design, synthesis, and assembly of nanomaterials with precisely controlled shapes and directional responsiveness are particularly critical in the development of new functional, near-device level materials. Spatial anisotropies are typically introduced by the placement of symmetrically or asymmetrically located responsive components enabling either interactions with the environment manifested by dimensional or color changes, energy storage and transfer, or diffusion. This review outlines recent advances in the synthesis, fabrication, and assembly of isotropic and anisotropic Polymer-based nanomaterials in which dimensional, color, and morphological changes are induced by external stimuli. Specifically, core-shell, hollow, Janus, gibbous/inverse gibbous nanoparticles prepared with precisely controlled morphologies capable of spatially responding totemperature, pH, electromagnetic radiation or biological changes are discussed. Recent advances in the nanoparticle surface modifications which are introduced to guide nanomaterials to selectively interact and communicate with the environment are also highlighted. Since high aspect ratio nanomaterials, including Polymeric nanowires or nanotubes containing responsive components, are particularly attractive in the development of 3D multi-functional objects, their manufacturing as well as applications are examined. Although many uses of Stimuli-Responsive nanomaterials in electronics, energy conversion, sensing, or biomedicine and other technologies are already in place, there are limitless opportunities for new applications as long as proper regulatory measures are exercised to elevate the impact of these materials on the environment. Polymeric Stimuli-Responsive nanomaterials offer a tremendous opportunity for the development of cognitive materials’ systems, particularly when protein-like Polymers containing amino acids joined by polypeptide bonds with enzymes or sugar-phosphate moieties as well as other sugar-containing interactions are utilized as building blocks and components of future materials.
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emerging applications of stimuli responsive Polymer materials
Nature Materials, 2010Co-Authors: Martien Cohen A Stuart, Manfred Stamm, Wilhelm T S Huck, Jan Genzer, Marcus Muller, Christopher K Ober, Gleb B Sukhorukov, Igal Szleifer, Vladimir V Tsukruk, Marek W. UrbanAbstract:Stimuli-Responsive Polymers can be engineered, in both film and colloid forms, to respond to a variety of inputs, from temperature to pH. The inherent flexibility in their structure and responses result in materials that lend themselves to applications ranging from drug delivery to sensing. Recent advances and future challenges in this direction are reviewed.
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Emerging applications of Stimuli-Responsive Polymer materials
Nature materials, 2010Co-Authors: Martien A. Cohen Stuart, Manfred Stamm, Wilhelm T S Huck, Jan Genzer, Marcus Muller, Christopher K Ober, Gleb B Sukhorukov, Igal Szleifer, Vladimir V Tsukruk, Marek W. UrbanAbstract:Responsive Polymer materials can adapt to surrounding environments, regulate transport of ions and molecules, change wettability and adhesion of different species on external stimuli, or convert chemical and biochemical signals into optical, electrical, thermal and mechanical signals, and vice versa. These materials are playing an increasingly important part in a diverse range of applications, such as drug delivery, diagnostics, tissue engineering and 'smart' optical systems, as well as biosensors, microelectromechanical systems, coatings and textiles. We review recent advances and challenges in the developments towards applications of Stimuli-Responsive Polymeric materials that are self-assembled from nanostructured building blocks. We also provide a critical outline of emerging developments.
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stratification stimuli responsiveness self healing and signaling in Polymer networks
Progress in Polymer Science, 2009Co-Authors: Marek W. UrbanAbstract:Abstract The design, development, and manufacturing of new materials continue to be an ongoing challenge for scientists and engineers. Because of similarities to biological systems having self-repairable properties, Polymer networks are of particular importance and interest, and if designed properly, may provide an unprecedented opportunity for mimicking biological systems. This can be accomplished through the formation of nanostructured Stimuli-Responsive networks that individually or collectively respond to internal or external stimuli. This article outlines selected recent developments and future trends that will formulate foundation for the development of stratified heterogeneous Stimuli-Responsive Polymer networks capable of reorganizing, self-healing, or signaling. The primary focus is on the physico-chemical attributes of multi-component Polymer networks with localized glass transition temperatures capable of stratification and exhibiting Stimuli-Responsiveness or recognition attributes.
Manfred Stamm - One of the best experts on this subject based on the ideXlab platform.
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adsorption of enzymes to stimuli responsive Polymer brushes influence of brush conformation on adsorbed amount and biocatalytic activity
Colloids and Surfaces B: Biointerfaces, 2016Co-Authors: Meike Koenig, Eva Bittrich, Bhadra Lakshmi Rajeev, Klaus Jochen Eichhorn, Ulla König, Manfred Stamm, Martin Muller, Sabu Thomas, Petra UhlmannAbstract:Abstract Polyelectrolyte brushes can be utilized to immobilize enzymes on macroscopic surfaces. This report investigates the influence of the pH value of the surrounding medium on the amount and the activity of enzymes adsorbed to poly(2-vinylpyridine) and poly(acrylic acid) brushes, as well as the creation of thermoresponsive biocatalytically active coatings via the adsorption of enzymes onto a mixed brush consisting of a polyelectrolyte and temperature-sensitive poly(N-isopropylacryl amide). Spectroscopic ellipsometry and attenuated total reflection-Fourier transform infrared spectroscopy are used to monitor the adsorption process. Additionally, infrared spectra are evaluated in terms of the secondary structure of the enzymes. Glucose oxidase is used as a model enzyme, where the enzymatic activity is measured after different adsorption conditions. Poly(acrylic acid) brushes generally adsorb larger amounts of enzyme, while less glucose oxidase is found on poly(2-vinylpyridine), which however exhibits higher specific activity. This difference in activity could be attributed to a difference in secondary structure of the adsorbed enzyme. For glucose oxidase adsorbed to mixed brushes, switching of enzymatic activity between an active state at 20 °C and a less active state at 40 °C as compared to the free enzyme in solution is observed. However, this switching is strongly depending on pH in mixed brushes of poly(acrylic acid) and poly(N-isopropylacryl amide) due to interactions between the Polymers.
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emerging applications of stimuli responsive Polymer materials
Nature Materials, 2010Co-Authors: Martien Cohen A Stuart, Manfred Stamm, Wilhelm T S Huck, Jan Genzer, Marcus Muller, Christopher K Ober, Gleb B Sukhorukov, Igal Szleifer, Vladimir V Tsukruk, Marek W. UrbanAbstract:Stimuli-Responsive Polymers can be engineered, in both film and colloid forms, to respond to a variety of inputs, from temperature to pH. The inherent flexibility in their structure and responses result in materials that lend themselves to applications ranging from drug delivery to sensing. Recent advances and future challenges in this direction are reviewed.
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Emerging applications of Stimuli-Responsive Polymer materials
Nature materials, 2010Co-Authors: Martien A. Cohen Stuart, Manfred Stamm, Wilhelm T S Huck, Jan Genzer, Marcus Muller, Christopher K Ober, Gleb B Sukhorukov, Igal Szleifer, Vladimir V Tsukruk, Marek W. UrbanAbstract:Responsive Polymer materials can adapt to surrounding environments, regulate transport of ions and molecules, change wettability and adhesion of different species on external stimuli, or convert chemical and biochemical signals into optical, electrical, thermal and mechanical signals, and vice versa. These materials are playing an increasingly important part in a diverse range of applications, such as drug delivery, diagnostics, tissue engineering and 'smart' optical systems, as well as biosensors, microelectromechanical systems, coatings and textiles. We review recent advances and challenges in the developments towards applications of Stimuli-Responsive Polymeric materials that are self-assembled from nanostructured building blocks. We also provide a critical outline of emerging developments.
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gold nanoparticles immobilized on stimuli responsive Polymer brushes as nanosensors
Macromolecules, 2008Co-Authors: Smrati Gupta, Petra Uhlmann, Mukesh Agrawal, Frank Simon, Ulrich Oertel, Manfred StammAbstract:We report on the immobilization of gold nanoparticles on end-functionalized and solvent responsive polystyrene brushes, grafted on an underlying substrate. The presence of gold nanoparticles on polystyrene brushes was confirmed by atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). The resulting polystyrene−Au nanoassemblies have been used as the nanosensors for the detection of a variety of organic solvents in surrounding media. The sensing mechanism is based upon the change in the proximity of the immobilized gold nanoparticles as a consequence of the solvent induced reversible swelling−deswelling of polystyrene chains. The sensing ability was demonstrated by a simple analytic tool, i.e., UV−vis spectroscopy, through a shift in plasmon resonance band of immobilized Au nanoparticles. A dramatic blue shift of 32 nm in the surface resonance band was observed as the surrounding media of Au immobilized polystyrene brushes (Au−PS) was changed from air to the toluene. The described approa...
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Reversible chemical patterning on Stimuli-Responsive Polymer film: environment-responsive lithography.
Journal of the American Chemical Society, 2003Co-Authors: Leonid Ionov, Sergiy Minko, Manfred Stamm, Jean-françois Gohy, Robert Jérôme, Andreas SchollAbstract:We report on a novel type of chemical patterning based on thin Stimuli-Responsive Polymer films. The basic concept is the permanent storage (writing) of a pattern, which is reversibly developed and erased upon exposure to appropriate environment, e.g., solvent, pH, and temperature. The smart surface is fabricated from the mixed brush of poly(2-vinylpyridine) and polyisoprene. The mixed brush demonstrates switching behavior upon exposure to different solvents. Cross-linking of polyisoprene via illumination through a photomask results in formation of patterns with suppressed switching. Due to the contrast in switching between illuminated and dark areas, exposure of the smart surface to different solvents causes either reversible formation or erasing of chemical contrast between the illuminated and dark areas. Thus, the pattern surface can very locally attract colloidal particles or can be wetted by water only upon exposure to the special solvent which introduces the contrast between the illuminated and dark areas. Appearance of the patterns indicates particular environment and can be used for local switching of adsorption.
Guo-jie Wang - One of the best experts on this subject based on the ideXlab platform.
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Multi-Stimuli-Responsive Polymer Materials: Particles, Films, and Bulk Gels.
Chemical Record, 2016Co-Authors: Guo-jie WangAbstract:Stimuli-Responsive Polymers have received tremendous attention from scientists and engineers for several decades due to the wide applications of these smart materials in biotechnology and nanotechnology. Driven by the complex functions of living systems, multi-Stimuli-Responsive Polymer materials have been designed and developed in recent years. Compared with conventional single- or dual-stimuli-based Polymer materials, multi-Stimuli-Responsive Polymer materials would be more intriguing since more functions and finer modulations can be achieved through more parameters. This critical review highlights the recent advances in this area and focuses on three types of multi-Stimuli-Responsive Polymer materials, namely, multi-Stimuli-Responsive particles (micelles, micro/nanogels, vesicles, and hybrid particles), multi-Stimuli-Responsive films (Polymer brushes, layer-by-layer Polymer films, and porous membranes), and multi-Stimuli-Responsive bulk gels (hydrogels, organogels, and metallogels) from recent publications. Various stimuli, such as light, temperature, pH, reduction/oxidation, enzymes, ions, glucose, ultrasound, magnetic fields, mechanical stress, solvent, voltage, and electrochemistry, have been combined to switch the functions of Polymers. The Polymer design, preparation, and function of multi-Stimuli-Responsive particles, films, and bulk gels are comprehensively discussed here.
Gleb B Sukhorukov - One of the best experts on this subject based on the ideXlab platform.
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Stimuli-Responsive Microarray Films for Real-Time Sensing of Surrounding Media, Temperature, and Solution Properties via Diffraction Patterns.
ACS applied materials & interfaces, 2020Co-Authors: Jiaxin Zhang, Meiyu Gai, Aleksei V. Ignatov, Sergey A. Dyakov, Jing Wang, Nikolay A. Gippius, Johannes Frueh, Gleb B SukhorukovAbstract:Stimuli-Responsive Polymers have attracted increasing attention over the years due to their ability to alter physiochemical properties upon external stimuli. However, many Stimuli-Responsive Polymer-based sensors require specialized and expensive equipment, which limits their applications. Here an inexpensive and portable sensing platform of novel microarray films made of Stimuli-Responsive Polymers is introduced for the real-time sensing of various environmental changes. When illuminated by laser light, microarray films generate diffraction patterns that can reflect and magnify variations of the periodical microstructure induced by surrounding invisible parameters in real time. Stimuli-Responsive polyelectrolyte complexes are structured into micropillar arrays to monitor the pH variation and the presence of calcium ions based on reversible swelling/shrinking behaviors of the Polymers. A pH hysteretic effect of the selected polyelectrolyte pair is determined and explained. Furthermore, polycaprolactone microchamber arrays are fabricated and display a thermal-driven structural change, which is exploited for photonic threshold temperature detection. Experimentally observed diffraction patterns are additionally compared with rigorous coupled-wave analysis simulations that prove that induced diffraction pattern alterations are solely caused by geometrical microstructure changes. Microarray-based diffraction patterns are a novel sensing platform with versatile sensing capabilities that will likely pave the way for the use of microarray structures as photonic sensors.
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emerging applications of stimuli responsive Polymer materials
Nature Materials, 2010Co-Authors: Martien Cohen A Stuart, Manfred Stamm, Wilhelm T S Huck, Jan Genzer, Marcus Muller, Christopher K Ober, Gleb B Sukhorukov, Igal Szleifer, Vladimir V Tsukruk, Marek W. UrbanAbstract:Stimuli-Responsive Polymers can be engineered, in both film and colloid forms, to respond to a variety of inputs, from temperature to pH. The inherent flexibility in their structure and responses result in materials that lend themselves to applications ranging from drug delivery to sensing. Recent advances and future challenges in this direction are reviewed.
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Emerging applications of Stimuli-Responsive Polymer materials
Nature materials, 2010Co-Authors: Martien A. Cohen Stuart, Manfred Stamm, Wilhelm T S Huck, Jan Genzer, Marcus Muller, Christopher K Ober, Gleb B Sukhorukov, Igal Szleifer, Vladimir V Tsukruk, Marek W. UrbanAbstract:Responsive Polymer materials can adapt to surrounding environments, regulate transport of ions and molecules, change wettability and adhesion of different species on external stimuli, or convert chemical and biochemical signals into optical, electrical, thermal and mechanical signals, and vice versa. These materials are playing an increasingly important part in a diverse range of applications, such as drug delivery, diagnostics, tissue engineering and 'smart' optical systems, as well as biosensors, microelectromechanical systems, coatings and textiles. We review recent advances and challenges in the developments towards applications of Stimuli-Responsive Polymeric materials that are self-assembled from nanostructured building blocks. We also provide a critical outline of emerging developments.
Sanjana Kankane - One of the best experts on this subject based on the ideXlab platform.
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responsive Polymers in controlled drug delivery
Progress in Polymer Science, 2008Co-Authors: A K Bajpai, Sandeep Shukla, Smitha Bhanu, Sanjana KankaneAbstract:Abstract This article reviews the state-of-the art in responsive Polymer systems for controlled drug delivery applications. The paper describes different types of stimuli-sensitive systems and gives an account of their synthesis through methods such as group transfer Polymerization, atom transfer radical Polymerization and reversible addition-fragmentation chain transfer Polymerization. The article also discusses classification of various drug delivery systems: diffusion controlled systems, chemically controlled systems, swelling-controlled systems and modulated release systems. A survey of the recent literature on various Stimuli-Responsive Polymer hydrogels in controlled drug delivery is also included.