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Your search keyword '"Wiesner, Ulrich B."' showing total 140 results
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140 results on '"Wiesner, Ulrich B."'

1. 3D printed mesoporous superconductors with periodic order on three length scales and enhanced properties via block copolymer directed self-assembly

Author

Yu, Fei, Thedford, R. Paxton, Tartaglia, Thomas A., Sheth, Sejal S., Freychet, Guillaume, Tait, William R. T., Beaucage, Peter A., Moore, William L., Li, Yuanzhi, Werner, Jörg G., Thom-Levy, Julia, Gruner, Sol M., van Dover, R. Bruce, and Wiesner, Ulrich B.

Subjects
Condensed Matter - Soft Condensed Matter, Condensed Matter - Materials Science, Condensed Matter - Superconductivity
Abstract

Solution-based soft matter self-assembly (SA) promises unique materials properties from approaches including additive manufacturing/three-dimensional (3D) printing. We report direct ink writing derived, hierarchically porous transition metal nitride superconductors (SCs) and precursor oxides, structure-directed by Pluronics-family block copolymer (BCP) SA and heat treated in various environments. SCs with periodic lattices on three length scales show record nanoconfinement-induced upper critical field enhancements correlated with BCP molar mass, attaining values of 50 T for NbN and 8.1 T for non-optimized TiN samples, the first mapping of a tailorable SC property onto a macromolecular parameter. They reach surface areas above 120 m$^2$/g, the highest reported for compound SCs to date. Embedded printing enables the first BCP directed mesoporous non-self-supporting helical SCs. Results suggest that additive manufacturing may open pathways to mesoporous SCs with not only a variety of macroscopic form factors but enhanced properties from intrinsic, SA-derived mesostructures with substantial academic and technological promise.

Published
2024

2. High-resolution three-dimensional imaging of topological textures in single-diamond networks

Author

Karpov, Dmitry, Djeghdi, Kenza, Holler, Mirko, Abdollahi, S. Narjes, Godlewska, Karolina, Donnelly, Claire, Yuasa, Takeshi, Sai, Hiroaki, Wiesner, Ulrich B., Wilts, Bodo D., Steiner, Ullrich, Musya, Michimasa, Fukami, Shunsuke, Ohno, Hideo, Gunkel, Ilja, Diaz, Ana, and Llandro, Justin

Subjects
Condensed Matter - Soft Condensed Matter, Condensed Matter - Materials Science
Abstract

Highly periodic structures are often said to convey the beauty of nature. However, most material properties are strongly influenced by the defects they contain. On the mesoscopic scale, molecular self-assembly exemplifies this interplay; thermodynamic principles determine short-range order, but long-range order is mainly impeded by the kinetic history of the material and by thermal fluctuations. For the development of self-assembly technologies, it is imperative to characterise and understand the interplay between self-assembled order and defect-induced disorder. Here we used synchrotron-based hard X-ray nanotomography to reveal a pair of extended topological defects within a self-assembled single-diamond network morphology. These defects are morphologically similar to the comet and trefoil patterns of equal and opposite half-integer topological charges observed in liquid crystals and appear to maintain a constant separation across the thickness of the sample, resembling pairs of full vortices in superconductors and other hard condensed matter systems. These results are expected to open new windows to study defect formation in soft condensed matter, particularly in biological systems where most structures are formed by self-assembly., Comment: Nat. Nanotechnol. (2024)

Published
2023
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3. X-ray nanotomography reveals formation of single diamonds by block copolymer self-assembly

Author

Djeghdi, Kenza, Karpov, Dmitry, Abdollahi, S. Narjes, Godlewska, Karolina, Holler, Mirko, Donnelly, Claire, Yuasa, Takeshi, Sai, Hiroaki, Wiesner, Ulrich B., Steiner, Ullrich, Wilts, Bodo D., Musya, Michimasa, Fukami, Shunsuke, Ohno, Hideo, Diaz, Ana, Llandro, Justin, and Gunkel, Ilja

Subjects
Condensed Matter - Soft Condensed Matter, Condensed Matter - Materials Science
Abstract

Block copolymers are recognised as a valuable platform for creating nanostructured materials with unique properties. Morphologies formed by block copolymer self-assembly can be transferred into a wide range of inorganic materials, enabling applications including energy storage and metamaterials. However, imaging of the underlying, often complex, nanostructures in large volumes has remained a challenge, limiting progress in materials development. Taking advantage of recent advances in X-ray nanotomography, we non-invasively imaged exceptionally large volumes of nanostructured soft materials at high resolution, revealing a single diamond morphology in a triblock terpolymer composite network. This morphology, which is ubiquitous in nature, has so far remained elusive in block copolymers, despite its potential to create materials with large photonic bandgaps. The discovery was made possible by the precise analysis of distortions in a large volume of the self-assembled diamond network, which are difficult to unambiguously assess using traditional characterisation tools. We anticipate that high-resolution X-ray nanotomography, which allows imaging of much larger sample volumes than electron-based tomography, will become a powerful tool for the quantitative analysis of complex nanostructures and that structures such as the triblock terpolymer-directed single diamond will enable the generation of advanced multicomponent composites with hitherto unknown property profiles., Comment: updated reference 38; added reference 40; corrected name of one author; corrected one affiliation; corrected legend in Extended Data Fig. 3

Published
2023

5. Surface Reconstruction Limited Conductivity in Block-Copolymer Li Battery Electrolytes

Author

Sutton, Preston, Bennington, Peter, Patel, Shrayesh N., Stefik, Morgan, Wiesner, Ulrich B., Nealey, Paul F., Steiner, Ullrich, and Gunkel, Ilja

Subjects
Physics - Applied Physics, Condensed Matter - Materials Science
Abstract

Solid polymer electrolytes for lithium batteries promise improvements in safety and energy density if their conductivity can be increased. Nanostructured block copolymer electrolytes specifically have the potential to provide both good ionic conductivity and good mechanical properties. This study shows that the previously neglected nanoscale composition of the polymer electrolyte close to the electrode surface has an important effect on impedance measurements, despite its negligible extent compared to the bulk electrolyte. Using standard stainless steel blocking electrodes, the impedance of lithium salt-doped poly(isoprene-b-styrene-b-ethylene oxide) (ISO) exhibited a marked decrease upon thermal processing of the electrolyte. In contrast, covering the electrode surface with a low molecular weight poly(ethylene oxide) (PEO) brush resulted in higher and more reproducible conductivity values, which were insensitive to the thermal history of the device. A qualitative model of this effect is based on the hypothesis that ISO surface reconstruction at the different electrode surfaces leads to a change in the electrostatic double layer, affecting electrochemical impedance spectroscopy measurements. As a main result, PEO-brush modification of electrode surfaces is beneficial for the robust electrolyte performance of PEO-containing block-copolymers and may be crucial for their accurate characterization and use in Li-ion batteries.

Published
2019
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7. Nanotechnology Strategies To Advance Outcomes in Clinical Cancer Care

Author

Hartshorn, Christopher M, Bradbury, Michelle S, Lanza, Gregory M, Nel, Andre E, Rao, Jianghong, Wang, Andrew Z, Wiesner, Ulrich B, Yang, Lily, and Grodzinski, Piotr

Subjects
Nanotechnology, Prevention, Bioengineering, Cancer, Clinical Research, Biotechnology, Animals, Humans, Immunotherapy, Nanomedicine, National Cancer Institute (U.S.), Neoplasm Metastasis, Neoplasms, Surgery, Computer-Assisted, Treatment Outcome, United States, nanotechnology, alliance, immunotherapy, radiotherapy, biological barriers, cancer, oncology, National Cancer Institute, Cancer Nanotechnology Plan, metastasis, image-guided surgery, Nanoscience & Nanotechnology
Abstract

Ongoing research into the application of nanotechnology for cancer treatment and diagnosis has demonstrated its advantages within contemporary oncology as well as its intrinsic limitations. The National Cancer Institute publishes the Cancer Nanotechnology Plan every 5 years since 2005. The most recent iteration helped codify the ongoing basic and translational efforts of the field and displayed its breadth with several evolving areas. From merely a technological perspective, this field has seen tremendous growth and success. However, an incomplete understanding of human cancer biology persists relative to the application of nanoscale materials within contemporary oncology. As such, this review presents several evolving areas in cancer nanotechnology in order to identify key clinical and biological challenges that need to be addressed to improve patient outcomes. From this clinical perspective, a sampling of the nano-enabled solutions attempting to overcome barriers faced by traditional therapeutics and diagnostics in the clinical setting are discussed. Finally, a strategic outlook of the future is discussed to highlight the need for next-generation cancer nanotechnology tools designed to address critical gaps in clinical cancer care.

Published
2018

9. Directed Self-Assembly of Diamond Networks in Triblock Terpolymer Films on Patterned Substrates

Author

Abdelrahman, Doha, primary, Iseli, René, additional, Musya, Michimasa, additional, Jinnai, Butsurin, additional, Fukami, Shunsuke, additional, Yuasa, Takeshi, additional, Sai, Hiroaki, additional, Wiesner, Ulrich B., additional, Saba, Matthias, additional, Wilts, Bodo D., additional, Steiner, Ullrich, additional, Llandro, Justin, additional, and Gunkel, Ilja, additional

Published
2023
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13. Ultrasmall Folate Receptor Alpha Targeted Enzymatically Cleavable Silica Nanoparticle Drug Conjugates Augment Penetration and Therapeutic Efficacy in Models of Cancer

Author

Wu, Fei, primary, Chen, Pei-Ming, additional, Gardinier, Thomas C., additional, Turker, Melik Z., additional, Venkatesan, Aranapakam M., additional, Patel, Vaibhav, additional, Khor, Tin, additional, Bradbury, Michelle S., additional, Wiesner, Ulrich B., additional, Adams, Gregory P., additional, Germano, Geno, additional, Chen, Feng, additional, and Ma, Kai, additional

Published
2022
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16. Molecular Engineering of Surface Functional Groups Enabling Clinical Translation of Nanoparticle–Drug Conjugates

Author

Wu, Fei, primary, Gardinier, Thomas C., additional, Turker, Melik Z., additional, Chen, Feng, additional, Chen, Pei-Ming, additional, Venkatesan, Aranapakam M., additional, Patel, Vaibhav, additional, Adams, Gregory P., additional, Bradbury, Michelle S., additional, Wiesner, Ulrich B., additional, Germano, Geno, additional, and Ma, Kai, additional

Published
2022
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22. Carbon-Assisted Stable Silver Nanostructures

Author

Abdollahi, S. Narjes, Ochoa-Martinez, Efrain, Kilchoer, Cédric, Kremer, Geoffroy, Jaouen, Thomas, Hellmann, Tim, Mayer, Thomas, Gu, Yibei, Wiesner, Ulrich B., Steiner, Ullrich, Wilts, Bodo D., and Gunkel, Ilja

Abstract

Galley proofs for the paper Carbon-Assisted Stable Silver Nanostructures

Published
2020

23. Ultrasmall, Bright, and Photostable Fluorescent Core–Shell Aluminosilicate Nanoparticles for Live‐Cell Optical Super‐Resolution Microscopy

Author

Erstling, Jacob A., primary, Hinckley, Joshua A., additional, Bag, Nirmalya, additional, Hersh, Jessica, additional, Feuer, Grant B., additional, Lee, Rachel, additional, Malarkey, Henry F., additional, Yu, Fei, additional, Ma, Kai, additional, Baird, Barbara A., additional, and Wiesner, Ulrich B., additional

Published
2021
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25. Carbon‐Assisted Stable Silver Nanostructures

Author

Abdollahi, S. Narjes, primary, Ochoa Martínez, Efraín, additional, Kilchoer, Cédric, additional, Kremer, Geoffroy, additional, Jaouen, Thomas, additional, Aebi, Philipp, additional, Hellmann, Tim, additional, Mayer, Thomas, additional, Gu, Yibei, additional, Wiesner, Ulrich B., additional, Steiner, Ullrich, additional, Wilts, Bodo D., additional, and Gunkel, Ilja, additional

Published
2020
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27. Fluorescent Silica Nanoparticles to Label Metastatic Tumor Cells in Mineralized Bone Microenvironments

Author

Chiou, Aaron E., primary, Hinckley, Joshua A., additional, Khaitan, Rupal, additional, Varsano, Neta, additional, Wang, Jonathan, additional, Malarkey, Henry F., additional, Hernandez, Christopher J., additional, Williams, Rebecca M., additional, Estroff, Lara A., additional, Weiner, Steve, additional, Addadi, Lia, additional, Wiesner, Ulrich B., additional, and Fischbach, Claudia, additional

Published
2020
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28. A Rheometry Method to Assess The Evaporation-Induced Mechanical Strength Development of Polymer Solutions Used For Membrane Applications

Author

Caicedo Casso, Eduard, Sargent, Jessica L, Dorin, Rachel M, Wiesner, Ulrich B, Phillip, William A, Boudouris, Bryan M, and Erk, Kendra

Subjects
Materials Science and Engineering, Block copolymer rheology, filtration membranes, SNIPS, viscoelasticity of polymer solutions, shear rheometry
Abstract

Rotational and oscillatory shear rheometry were used to quantify the flow behavior under minimal and significant solvent evaporation conditions for polymer solutions used to fabricate isoporous asymmetric membranes by the self-assembly and non-solvent induced phase separation (SNIPS) method. Three different A-B-C triblock terpolymer chemistries of similar molar mass were evaluated: polyisoprene-^-polystyrene-6-poly(4-vinylpyridine) (ISV); polyisoprene-6- polystyrene-6-poly(V,A-dimethylacrylamide) (ISD); and polyisoprene-Z>-polystyrene-h-poly(fer/- butyl methacrylate) (ISB). Solvent evaporation resulted in the formation of a viscoelastic film typical of asymmetric membranes. Solution viscosity and film viscoelasticity were strongly dependent on the chemical structure of the triblock terpolymer molecules. A hierarchical magnitude (ISV>ISB>ISD) was observed for both properties, with ISV solutions displaying the greatest solution viscosity, fastest film strength development, and greatest strength magnitude.

Published
2018

32. Controlling Surface Chemical Heterogeneities of Ultrasmall Fluorescent Core–Shell Silica Nanoparticles as Revealed by High-Performance Liquid Chromatography

Author

Gardinier, Thomas C., primary, Turker, Melik Z., additional, Hinckley, Joshua A., additional, Katt, William P., additional, DomNwachukwu, Naedum, additional, Woodruff, Fem, additional, Hersh, Jessica, additional, Wang, Jonathan, additional, Cerione, Richard A., additional, and Wiesner, Ulrich B., additional

Published
2019
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36. Amorphous Quantum Nanomaterials

Author

Kohle, Ferdinand F. E., primary, Hinckley, Joshua A., additional, Li, Songying, additional, Dhawan, Nikhil, additional, Katt, William P., additional, Erstling, Jacob A., additional, Werner‐Zwanziger, Ulrike, additional, Zwanziger, Josef, additional, Cerione, Richard A., additional, and Wiesner, Ulrich B., additional

Published
2018
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46. Generalized route to metal nanoparticles with liquid behavior

Author

Warren, Scott C., Banholzer, Matthew J., Slaughter, Liane S., Giannelis, Emmanuel P., DiSalvo, Francis J., and Wiesner, Ulrich B.

Subjects
Nanoparticles -- Chemical properties, Ligands -- Research, Ion exchange -- Analysis, Chemistry
Abstract

A generalized route to metal nanoparticles is developed in which a thiol-containing ionic liquid serves as a ligand for platinum, gold, palladium, and rhodium nanoparticles. The nanoparticles are found to flow as a liquid at room temperature upon anion exchange of bromide for sulfonate.

Published
2006

47. Pathways to Mesoporous Resin/Carbon Thin Films with Alternating Gyroid Morphology

Author

Zhang, Qi, Matsuoka, Fumiaki, Suh, Hyo Seon, Beaucage, Peter A., Xiong, Shisheng, Smilgies, Detlef-M., Tan, Kwan Wee, Werner, Jörg G., Nealey, Paul F., and Wiesner, Ulrich B.

Abstract

Three-dimensional (3D) mesoporous thin films with sub-100 nm periodic lattices are of increasing interest as templates for a number of nanotechnology applications, yet are hard to achieve with conventional top-down fabrication methods. Block copolymer self-assembly derived mesoscale structures provide a toolbox for such 3D template formation. In this work, single (alternating) gyroidal and double gyroidal mesoporous thin-film structures are achieved viasolvent vapor annealing assisted co-assembly of poly(isoprene-block-styrene-block-ethylene oxide) (PI-b-PS-b-PEO, ISO) and resorcinol/phenol formaldehyde resols. In particular, the alternating gyroid thin-film morphology is highly desirable for potential template backfilling processes as a result of the large pore volume fraction. In situgrazing-incidence small-angle X-ray scattering during solvent annealing is employed as a tool to elucidate and navigate the pathway complexity of the structure formation processes. The resulting network structures are resistant to high temperatures provided an inert atmosphere. The thin films have tunable hydrophilicity from pyrolysis at different temperatures, while pore sizes can be tailored by varying ISO molar mass. A transfer technique between substrates is demonstrated for alternating gyroidal mesoporous thin films, circumventing the need to re-optimize film formation protocols for different substrates. Increased conductivity after pyrolysis at high temperatures demonstrates that these gyroidal mesoporous resin/carbon thin films have potential as functional 3D templates for a number of nanomaterials applications.

Published
2018
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48. Ordered Mesoporous Materials From Metal Nanoparticle–Block Copolymer Self-Assembly

Author

Warren, Scott C., Messina, Lauren C., Slaughter, Liane Siu, Kamperman, Marleen, Zhou, Qin, Grüner, Sol M., DiSalvo, Francis J., Wiesner, Ulrich B., Warren, Scott C., Messina, Lauren C., Slaughter, Liane Siu, Kamperman, Marleen, Zhou, Qin, Grüner, Sol M., DiSalvo, Francis J., and Wiesner, Ulrich B.

Abstract

The synthesis of ordered mesoporous metal composites and ordered mesoporous metals is a challenge because metals have high surface energies that favor low surface areas. We present results from the self-assembly of block copolymers with ligand-stabilized platinum nanoparticles, leading to lamellar CCM-Pt-4 and inverse hexagonal (CCM-Pt-6) hybrid mesostructures with high nanoparticle loadings. Pyrolysis of the CCM-Pt-6 hybrid produces an ordered mesoporous platinum-carbon nanocomposite with open and large pores (≥10 nanometers). Removal of the carbon leads to ordered porous platinum mesostructures. The platinum-carbon nanocomposite has very high electrical conductivity (400 siemens per centimeter) for an ordered mesoporous material fabricated from block copolymer self-assembly.

Published
2008

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