Sentences with phrase «block copolymers»
Block copolymers are a type of plastic made up of two or more different types of repeating units. These units are joined together in blocks rather than being mixed randomly. This gives the copolymer special properties, as it combines the strengths of each type of unit. Full definition
The implication of these features on the potential application of this type of block copolymers for templating will be discussed.
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«But they can not do this in the complex macromolecules we make because with so many block copolymer arms formed, there is no space.
Degradation and cell culture studies on block copolymers prepared by ring opening polymerization of ε - caprolactone in the presence of poly (ethylene glycol).
«To create these structures, we used nonlinear bottlebrush - like block copolymers as tiny reactors to template the growth of an exciting variety of inorganic nanorods.»
Here's the retraction notice for «Controlled synthesis of magnetic block copolymers for anti-microbial purpose,» published in the Journal of Applied Polymer Science in November and retracted in February: Continue reading Paper quickly retracted after author used another group's work
We create arrays of proteins on surfaces by combining block copolymer lithography as surface prepatterning technique and enzyme mediated autodeposition.
IBM researchers engineered a class of molecules called block copolymers to self - assemble into dense patterns to extend the capabilities of photolithography.
Poly (ether - ester) thermoplastic elastomers are segmented block copolymers consisting of alternating sequences of flexile polyether and rigid polyester segments.
Resume: Poly (ether - ester) thermoplastic elastomers are segmented block copolymers consisting of alternating sequences of flexile polyether and rigid polyester segments.
The self - assembly of large molecular weight block copolymers into spatially oriented nanodomains has opened up a range of new possibilities in the manufacture of sub-wavelength optical nanostructures, such as Si nanopillars for anti-reflective coatings (1).
Resume: The self - assembly of large molecular weight block copolymers into spatially oriented nanodomains has opened up a range of new possibilities in the manufacture of sub-wavelength optical nanostructures, such as Si nanopillars for anti-reflective coatings (1).
Self - organization of block copolymers allows to form nanopatterns which have attracted a considerable attention as an alternative approach to overcome the characteristic size limitation of the conventional lithography processes.
It is found that the self - assemble nanostructures depend on the confinement size, block copolymer properties, and oil / water interfacial properties.
The results suggest a new class of synthetic thin - shelled capsules based on block copolymer chemistry.
The densely grafted block copolymer arms, together with the rigid cellulose backbone, give researchers the ability to not only prevent aggregation of the resulting nanorods, but also to keep them from bending.
«We used block copolymers because they allow the phases to be obtained.
«We created salt - responsive block copolymers that self - assemble in water to form either «conventional» or «inverse» micelles,» states Vasantha.
Vivek Vasantha at A * STAR Institute of Chemical and Engineering Sciences — together with scientists from across Singapore under the Innovative Marine Antifouling Solutions (IMAS) program — developed a new block copolymer that can self - assemble into spherical micelle structures in which one monomer forms the core and the other forms the outer shell.
«Block copolymer micellization as a protection strategy for DNA origami.»
In their study «Block Copolymer Micellization as a Protection Strategy for DNA Origami» published in Angewandte Chemie [DOI: 10.1002 / anie.201608873] they showed that such DNA nanostructures covered with the polymers were protected against nuclease digestion and low salt conditions.
From the complementary DNA, we deduced that the primary structure of a collagenous protein (preCol - P) predominating in the extensible proximal portion of the threads encodes an unprecedented natural block copolymer with three major domain types: a central collagen domain, flanking elastic domains, and histidine - rich terminal domains.
In this study, a series of perpendicular lamellae - forming high - chi block copolymers have been developed based on the bottom - up concept of a simple yet effective material that adjusts the chemical properties and molecular composition of the material.
We study the directed self - assembly of an 11 nm half - pitch PS - b - PMMA block copolymer in topographical guiding patterns that consist of arrays of silicon oxide lines of sub-10 nm width.
Devices have been synthesized thus far using high molecular weight PS - b - P2VP block copolymer on silicon substrates.
We show in this presentation that block copolymer self - assembly give access to a straightforward and versatile nanofabrication method for this type of structures.
When the self - assembly of block copolymer occurs within the emulsion droplet, the confinement effect can effectively break the symmetry of a structure, resulting in the formation of some unique nanostructures which can not be obtained in bulk state.
Cellulose gum, Styrene Isoprene Styrene Block Copolymer, Polysobutylene, Petroleum Resin, Polyurethane Film, Liquid Paraffin, Tetrakis Methane
«By choosing a different outer block in the bottlebrush - like block copolymers, our nanorods can be dissolved and uniformly dispersed in organic solvents such as toluene or chloroform, or in water.»
They're made from one - dimensional stacks of layered polymers, called block copolymers.
Resume: Self - organization of block copolymers allows to form nanopatterns which have attracted a considerable attention as an alternative approach to overcome the characteristic size limitation of the conventional lithography processes.
Based on a cellulose backbone, the system relies on the growth of block copolymer «arms» that help create a compartment to serve as a nanometer - scale chemical reactor.
The model system developed by researchers from the Jülich Centre for Neutron Science is made up of water and block copolymers — thread - like molecules with both a hydrophilic and a hydrophobic component.
The brominated cellulose then serves as macroinitiator for the growth of the block copolymer arms with well - controlled lengths using the atom transfer radical polymerization (ATRP) process, with, for example, poly (acrylic acid)- block - polystyrene (PAA - b - PS) yielding cellulose densely grafted with PAA - b - PS (i.e., cellulose - g -[PAA - b - PS]-RRB- that give the bottlebrush appearance.
Spinodal decomposition of block copolymers and oligomeric additives produces three - dimensional hierarchical porous polymers.
By varying the chemistry and the number of blocks in the arms of the bottlebrush - like block copolymers, Lin and coworkers produced an array of oil - soluble and water - soluble plain nanorods, core - shell nanorods, and hollow nanorods — nanotubes — of different dimensions and compositions.
Materials composed of segments of two different monomers, each with different characteristics, are known as block copolymers.
The block copolymer alters its structure in response to salt solution, enabling it to survive intact in dynamic marine environments.
The researchers mixed the block copolymers with primer to create a non-toxic coating to replace traditional antifouling paint.
For this purpose he worked with a block copolymer made of polystyrene and polybutadiene.
The result is a material that has an affinity with polystyrene, and which produces the desired homogenous dispersion when blended with the block copolymer.
In tests in a mouse model of advanced atherosclerosis, core - shell nanoparticles, composed of block copolymers and targeted to sites of inflammation and vascular injury, delivered a bioactive peptide that improved key properties of advanced plaques.
Block copolymer (BCP) lithography allows for the large - area structuring of surfaces with self - assembled nanopatterns.
The fabrication parameters mentioned above are also optimised for large molecular weight PS - b - PEO, and the relative feature spacing, film coverage, diameters and nanostructure characteristics for both block copolymers are extensively compared.
In comparison with standard di - block copolymers the morphological control of the phase separated copolymers is more complex and requires further understanding.
Video - rate atomic force microscopy (AFM) provides a new paradigm for studying the evolution of block copolymer (BCP) self - assembly during the thermal annealing process.
A conventional top - down approach based on e-beam lithography is tested together with a bottom - up solution based on directed self - assembly of block copolymers.
Resume: Block copolymer is a type of polymer constituted by different polymer segments covalently linked together.