Abstract: Described herein, in part, are compositions and methods for processing and curing photopolymer composition based on olefin matathesis. The photopolymer composition comprises a latent ruthenium (Ru) complex, an initiator and at least one polymer precursor. A method for preparing a cured photopolymer composition comprises exposing the photopolymer composition to electromagnetic radiation above a threshold energy to activate the initiator and exposing the photopolymer to electromagnetic radiation below said threshold energy, thereby preparing the cured photopolymer composition.

Abstract: The present disclosure relates to a method for generating a dental product or an orthodontic product. The method may comprise (a) providing a mixture comprising (i) a latent ruthenium (Ru) complex; (ii) an initiator; (iii) a sensitizer that sensitizes said initiator; and (iv) at least one polymer precursor; and (b) exposing the mixture to electromagnetic radiation to activate the initiator, wherein upon activation, the initiator reacts with the latent Ru complex to generate an activated Ru complex, which activated Ru complex reacts with the at least one polymer precursor to generate at least a portion of a final product of the dental product or the orthodontic product, wherein the at least the portion of the final product of the dental product or the orthodontic product comprises a polymer generated from the at least one polymer precursor.

Abstract: Described herein are compositions and methods for processing photopolymers based on olefin metathesis. The compositions and methods comprise latent ruthenium complexes and photoacids and/or photoacid generators.

Abstract: Described herein are compositions and methods for processing photopolymers based on olefin metathesis. The compositions and methods comprise latent ruthenium complexes and photoacids and/or photoacid generators.

Abstract: Described herein are compositions and methods for generating dental products or orthodontic products. The compositions and methods comprise latent ruthenium complexes and photoacids and/or photoacid generators.

Abstract: Described herein are compositions and methods for processing photopolymers based on olefin metathesis. The compositions and methods comprise latent ruthenium complexes and photoacids and/or photoacid generators.

Abstract: The present invention relates to methods of metathesizing olefins using catalysts previously considered to be practically inactive. The present invention further relates to novel photosensitive compositions, their use as photoresists, and methods related to patterning polymer layers on substrates. Further, modifications to the compositions and method provide for an unprecedented functionalization of the compositions, useful for example in the preparation of sensors, drug delivery systems, and tissue scaffolds. The novel compositions and associated methods also provide for the opportunity to prepare 3-dimensional objects which provide new access to critically dimensioned devices, including for example photonic devices.

Abstract: The invention provides a class of block copolymers having a plurality of chemically different blocks, at least a portion of which incorporating polymer side chain groups having a helical secondary structure. The invention also provides structures generated by self-assembly of polymer blends including at least one block copolymer component, such as a brush block polymer or wedge-type block polymer. The invention provides, for example, periodic nanostructures and microstructures generated by self-assembly of block copolymers and polymer blends comprising a mixture of at least one block copolymer component, such as a brush block copolymer, and at least a second component.

Abstract: The present disclosure is directed to photosensitive compositions ‘Fischer-type’ ruthenium carbene catalysts containing chelated 2,2?-bipyridine ligands and methods of using the same. These catalysts are surprisingly active even when using relatively low intensity diode light sources. The 2,2?-bipyridine-chelated ruthenium photocatalysts show reactivity at substantially lower exposure levels than other photoactive chelating dinitrogen ligands of similar structure. The present disclosure is further directed to novel photosensitive compositions, their use as photoresists, and methods related to patterning polymer layers on substrates.

Abstract: The devices can be fabricated by a method that permits active polymer chains to be polymerized on the surface of an electrode such that the active polymer chains are aligned with one another. The active polymer chains can also be covalently linked to a second electrode so the active polymer chains are located in an active layer of the device. The polymerization method can be paused and resumed at any point in the polymerization so nanoparticles can be added into the active layer. Additionally, the polymerization method allows that active polymer chains to be polymerized so they include junctions such as p-n junctions and Schottky junctions.

Abstract: The invention provides a class of wedge-type block copolymers having a plurality of chemically different blocks, at least a portion of which incorporates a wedge group-containing block providing useful properties. For example, use of one or more wedge group-containing blocks in some block copolymers of the invention significantly inhibits chain entanglement and, thus, the present block copolymers materials provide a class of polymer materials capable of efficient molecular self-assembly to generate a range of structures, such as periodic nanostructures and microstructures. Materials of the present invention include copolymers having one or more wedge group-containing blocks, and optionally for some applications copolymers also incorporating one or more polymer side group-containing blocks. The present invention also provides useful methods of making and using wedge-type block copolymers.

Abstract: The present disclosure is directed to photosensitive compositions ‘Fischer-type’ ruthenium carbene catalysts containing chelated 2,2?-bipyridine ligands and methods of using the same. These catalysts are surprisingly active even when using relatively low intensity diode light sources. The 2,2?-bipyridine-chelated ruthenium photocatalysts show reactivity at substantially lower exposure levels than other photoactive chelating dinitrogen ligands of similar structure. The present disclosure is further directed to novel photosensitive compositions, their use as photoresists, and methods related to patterning polymer layers on substrates.

Abstract: The present disclosure is directed to processes comprising irradiating an aggregate of chemically bonded or otherwise associated nanoparticles with a light source capable of providing multiphoton excitation, the light source directed at a focal point volume including the aggregate and having sufficient energy to disrupt or fuse the aggregate within the focal point volume to form nanoscale deposits of the nanoparticles.

Abstract: A CO2 reduction electrode includes an active layer on an electrode base. The active layer includes a polymer that includes one or more reaction components selected from a group consisting of a CO2 reduction catalyst and an activator that bonds CO2 so as to form a CO2 reduction intermediate.

Abstract: An efficient method for the preparation of backbone-substituted imidazolinium salts for use as N-heterocyclic carbene ligands, e.g., for organometallic catalysts is provided. These functionalized N-heterocyclic carbene ligands are used to prepare solid-supported catalysts, e.g., for olefin metathesis.

Abstract: Described herein are copolymers constructed from chiral, non-racemic monomers, which self-assemble to photonic crystals. The difficulty of incorporating chiral elements into photonic crystals has limited the ability to generate unique bandstructures for different circular polarizations of light. The materials and methods described herein relate to easily, predictably fabricating chiral photonic crystals having desirable optical properties.

Abstract: The invention provides a class of block copolymers having a plurality of chemically different blocks, at least a portion of which incorporating polymer side chain groups having a helical secondary structure. The invention also provides structures generated by self-assembly of polymer blends including at least one block copolymer component, such as a brush block polymer or wedge-type block polymer. The invention provides, for example, periodic nanostructures and microstructures generated by self-assembly of block copolymers and polymer blends comprising a mixture of at least one block copolymer component, such as a brush block copolymer, and at least a second component.

Abstract: The invention provides a class of block copolymers having a plurality of chemically different blocks, at least a portion of which incorporating polymer side chain groups having a helical secondary structure. The invention also provides structures generated by self-assembly of polymer blends including at least one block copolymer component, such as a brush block polymer or wedge-type block polymer. The invention provides, for example, periodic nanostructures and microstructures generated by self-assembly of block copolymers and polymer blends comprising a mixture of at least one block copolymer component, such as a brush block copolymer, and at least a second component.

Abstract: The present disclosure is directed to processes comprising irradiating an aggregate of chemically bonded or otherwise associated nanoparticles with a light source capable of providing multiphoton excitation, the light source directed to a focal point volume including the aggregate and having sufficient energy to disrupt or fuse the aggregate within the focal point volume to form nanoscale deposits of the nanoparticles.

Abstract: The devices can be fabricated by a method that permits active polymer chains to be polymerized on the surface of an electrode such that the active polymer chains are aligned with one another. The active polymer chains can also be covalently linked to a second electrode so the active polymer chains are located in an active layer of the device. The polymerization method can be paused and resumed at any point in the polymerization so nanoparticles can be added into the active layer. Additionally, the polymerization method allows that active polymer chains to be polymerized so they include junctions such as p-n junctions and Schottky junctions.