Search results for: Ralph G. Nuzzo

Items from 1 to 20 out of 88 results

article

Multifunctional Materials Strategies for Enhanced Safety of Wireless, Skin‐Interfaced Bioelectronic Devices (Adv. Funct. Mater. 34/2023)

Claire Liu, Jin‐Tae Kim, Da Som Yang, Donghwi Cho, more

Advanced Functional Materials > 33 > 34 > n/a - n/a

Wireless Wearables In article number 2302256, John A. Rogers, Ralph G. Nuzzo, Yonggang Huang, and co‐workers report a miniaturized, wireless mechanoacoustic sensor, encapsulated with a self‐healing, dynamic covalent elastomer, embedded with chemistries that provide colorimetric responses, strain‐adaptive stiffening, and thermal insulation properties relevant to the safety of wireless, skin‐interfaced...

article

Multifunctional Materials Strategies for Enhanced Safety of Wireless, Skin‐Interfaced Bioelectronic Devices

Claire Liu, Jin‐Tae Kim, Da Som Yang, Donghwi Cho, more

Advanced Functional Materials > 33 > 34 > n/a - n/a

Many recently developed classes of wireless, skin‐interfaced bioelectronic devices rely on conventional thermoset silicone elastomer materials, such as poly(dimethylsiloxane) (PDMS), as soft encapsulating structures around collections of electronic components, radio frequency antennas and, commonly, rechargeable batteries. In optimized layouts and device designs, these materials provide attractive...

article

Biomimetic and Biologically Compliant Soft Architectures via 3D and 4D Assembly Methods: A Perspective

Jay M. Taylor, Haiwen Luan, Jennifer A. Lewis, John A. Rogers, more

Advanced Materials > 34 > 16 > n/a - n/a

Recent progress in soft material chemistry and enabling methods of 3D and 4D fabrication—emerging programmable material designs and associated assembly methods for the construction of complex functional structures—is highlighted. The underlying advances in this science allow the creation of soft material architectures with properties and shapes that programmably vary with time. The ability to control...

article

3D Printing High‐Resolution Conductive Elastomeric Structures with a Solid Particle‐Free Emulsion Ink

Chen Wang, Gaurav Chaudhary, Randy H. Ewoldt, Ralph G. Nuzzo

Advanced Engineering Materials > 24 > 3 > n/a - n/a

Fabricating complex structures on micro‐ and mesoscales is a critical aspect in the design of advanced sensors and soft electronics. However, soft lithographic methods offer an important approach to fabricating such structures, the progress in the field of additive manufacturing (e.g., 3D printing) offers methods of fabrication with much more material complexity. The rheological complexity of the...

article

3D Particle‐Free Printing of Biocompatible Conductive Hydrogel Platforms for Neuron Growth and Electrophysiological Recording

Chen Wang, Stanislav S. Rubakhin, Michael J. Enright, Jonathan V. Sweedler, more

Advanced Functional Materials > 31 > 14 > n/a - n/a

Electrically conductive 3D periodic microscaffolds are fabricated using a particle‐free direct ink writing approach for use as neuronal growth and electrophysiological recording platforms. A poly (2‐hydroxyethyl methacrylate)/pyrrole ink, followed by chemical in situ polymerization of pyrrole, enables hydrogel printing through nozzles as small as 1 µm. These conductive hydrogels can pattern complex...

article

Ionotropic Gradients: Ionic Hydrogels with Biomimetic 4D‐Printed Mechanical Gradients: Models for Soft‐Bodied Aquatic Organisms (Adv. Funct. Mater. 28/2019)

Joselle M. McCracken, Brittany M. Rauzan, Jacob C. E. Kjellman, Hanxiao Su, more

Advanced Functional Materials > 29 > 28 > n/a - n/a

In article number 1806723, Ralph G. Nuzzo and co‐workers use direct ink writing to prepare soft sea jelly‐mimetic aquatic actuators made from hydrogel materials that integrate structure, composition, and ion‐based gradients to allow mimicry of the dynamic and flexural features of cnidarian organisms. Image courtesy of Joselle M. McCracken.

article

Ionic Hydrogels with Biomimetic 4D‐Printed Mechanical Gradients: Models for Soft‐Bodied Aquatic Organisms

Joselle M. McCracken, Brittany M. Rauzan, Jacob C. E. Kjellman, Hanxiao Su, more

Advanced Functional Materials > 29 > 28 > n/a - n/a

Direct‐ink writing (DIW), a rapidly growing and advancing form of additive manufacturing, provides capacities for on‐demand tailoring of materials to meet specific requirements for final designs. The penultimate challenge faced with the increasing demand of customization is to extend beyond modification of shape to create 4D structures, dynamic 3D structures that can respond to stimuli in the local...

article

Emulsions: Particle‐Free Emulsions for 3D Printing Elastomers (Adv. Funct. Mater. 21/2018)

Brittany M. Rauzan, Arif Z. Nelson, Sean E. Lehman, Randy H. Ewoldt, more

Advanced Functional Materials > 28 > 21 > n/a - n/a

3D printing provides powerful on‐demand customization of fabricated structures. A printing‐centric approach for 3D printing extensible, particle‐free silicone oil‐in‐water emulsions with polymer additives is developed by Randy H. Ewoldt, Ralph G. Nuzzo, and co‐workers in article number 1707032 to probe the critical relationship between extensional rheology yield‐stress fluid inks, and 3D printing...

article

Particle‐Free Emulsions for 3D Printing Elastomers

Brittany M. Rauzan, Arif Z. Nelson, Sean E. Lehman, Randy H. Ewoldt, more

Advanced Functional Materials > 28 > 21 > n/a - n/a

3D printing is a rapidly growing field that requires the development of yield‐stress fluids that can be used in postprinting transformation processes. There is a limited number of yield‐stress fluids currently available with the desired rheological properties for building structures with small filaments (≤l00 µm) with high shape‐retention. A printing‐centric approach for 3D printing particle‐free...

article

In situ surface stress measurement and computational analysis examining the oxygen reduction reaction on Pt and Pd

Yeyoung Ha, Justin L. Oberst, Zhenhua Zeng, Thao T.H. Hoang, more

Electrochimica Acta > 2018 > 260 > C > 400-406

Dynamic electrochemical surface stress response during the oxygen reduction reaction (ORR) on Pt and Pd cantilever electrodes in HClO₄ and KOH was examined to elucidate surface binding configurations during O₂ reduction electrocatalysis. Upon reduction of O₂, the surface of Pt exhibits a compressive surface stress response, ΔStress, in both acid and base electrolytes due to adsorption of the ORR reactant...

article

Anisotropic Mg Electrodeposition and Alloying with Ag-based Anodes from Non-Coordinating Mixed-Metal Borohydride Electrolytes for Mg Hybrid Batteries

David J. Wetzel, Marvin A. Malone, Andrew A. Gewirth, Ralph G. Nuzzo

Electrochimica Acta > 2017 > 229 > C > 112-120

A highly anisotropic electrodeposition was observed using the hybrid battery electrolyte Mg(BH₄)₂ with LiBH₄ in diglyme. At low overpotentials high aspect ratio platelet morphologies are observed with a strong fiber texture composed of a {10-10} and a {11-20} component, the first evidence of behavior of this kind in magnesium battery electrolytes. At high overpotentials the deposit aspect ratio is...

article

Design, fabrication, and characterization of a proposed microchannel water electrolyzer

Muhammed E. Oruc, Amit V. Desai, Ralph G. Nuzzo, Paul J.A. Kenis

Journal of Power Sources > 2016 > 307 > C > 122-128

Solar energy-powered water electrolysis is a cost-effective and scalable method to produce hydrogen, an environment-friendly and potentially sustainable energy carrier. To this end, we report a microchannel water electrolyzer with a planar design that can be integrated with a photovoltaic cell, where the electrolyzer utilizes the waste heat generated during the photoelectric process to enhance the...

article

Comprehensive energy analysis of a photovoltaic thermal water electrolyzer

Muhammed E. Oruc, Amit V. Desai, Paul J.A. Kenis, Ralph G. Nuzzo

Applied Energy > 2016 > 164 > C > 294-302

The use of photovoltaic thermal (PVT) technologies enables improvement in the electrical efficiency of a photovoltaic (PV) module by reducing the temperature of the PV module via active waste heat removal. In current PVT systems, the removed heat is mainly used for specific applications, such as water and/or room heating, but their need is intermittent and seasonal. For a more efficient and versatile...

article

3D Scaffolded Nickel–Tin Li‐Ion Anodes with Enhanced Cyclability

Huigang Zhang, Tan Shi, David J. Wetzel, Ralph G. Nuzzo, more

Advanced Materials > 28 > 4 > 742 - 747

A 3D mechanically stable scaffold is shown to accommodate the volume change of a high‐specific‐capacity nickel–tin nanocomposite during operation as a Li‐ion battery anode. The nickel–tin anode is supported by an electrochemically inactive conductive scaffold with an engineered free volume and controlled characteristic dimensions, which engender the electrode with significantly improved cyclability...

chapter

Polarization controlled output of electrohydrodynamic jet printed quantum dot embedded photonic crystals for display applications

Gloria G. See, Lu Xu, Erick Sutanto, Andrew G. Alleyne, more

2015 IEEE Photonics Conference (IPC) > 180 - 181

2015 IEEE Photonics Conference (IPC)

We demonstrate a replica molded photonic crystal structure with embedded quantum dots in which electrohydrodynamic jet printing is used to control the position of the quantum dots within the device structure. This results in significantly less waste of the quantum dot material and the targeted placement of the quantum dots minimizes any emission outside of the resonant enhancement field, enabling...

chapter

Region specific enhancement of quantum dot emission using interleaved two-dimensional photonic crystals

Gloria G. See, Lu Xu, Matt S. Naughton, Tiantian Tang, more

2015 Conference on Lasers and Electro-Optics (CLEO) > 1 - 2

2015 Conference on Lasers and Electro-Optics (CLEO)

We demonstrate an approach in which visible-wavelength-emitting quantum dots (QDs) are integrated within a polymer-based photonic crystal (PC) and excited by an ultraviolet-emitting LED. The PC design incorporates two interleaved regions, each with distinct periods in orthogonal directions to enable simultaneous resonant coupling of ultraviolet excitation photons to the QDs and visible QD emission...

article

Programming matter through strain

Michael J. Motala, Daniel Perlitz, Christopher M. Daly, Peixi Yuan, more

Extreme Mechanics Letters > 2015 > 3 > Complete > 8-16

We describe the use of light in a lithographic form of grayscale patterning as a means to program the properties and folding mechanics of flat, thin-film-polymeric materials. In this process, a finely dispersed (phase-separated) mixture of photoresist (SU-8 50) in polydimethylsiloxane (PDMS) is irradiated with ultraviolet light through a photomask. The subsequent photoresist cross-linking in the exposed...

article

Inorganic Materials and Assembly Techniques for Flexible and Stretchable Electronics

Junwen He, Ralph G. Nuzzo, John A. Rogers

Proceedings of the IEEE > 2015 > 103 > 4 > 619 - 632

In recent years, important progress has been made in developing design strategies, materials, and associated assembly techniques that provide empowering approaches to electronics with unconventional formats, ones that allow useful but previously hard to realize attributes of function. Notable examples of the progress made include: light weight, large area, high performance electronics, optics, and...

chapter

Printed high-efficiency quadruple-junction, four-terminal solar cells and modules for full spectrum utilization

Xing Sheng, Christopher A. Bower, Salvatore Bonafede, John W. Wilson, more

2014 IEEE Photonics Conference > 433 - 434

2014 IEEE Photonics Conference (IPC)

We present printed microscale multijunction (MJ) multi-terminal high-efficiency solar cells to overcome the epi-growth and current-matching limitations of conventional MJ cells. We demonstrate quadruple junction, four-terminal solar cells with measured efficiencies of 43.9% at concentrations exceeding 1000 suns, and modules with efficiencies of 36.5%.

chapter

High efficiency quadruple junction, four-terminal solar cells and modules by transfer printing

Xing Sheng, Christopher A. Bower, Salvatore Bonafede, John W. Wilson, more

2014 IEEE 40th Photovoltaic Specialist Conference (PVSC) > 3605 - 3607

2014 IEEE 40th Photovoltaic Specialists Conference (PVSC)

Conventional multi-junction (MJ) cells are limited by requirements in epitaxial growth and current-matching. Mechanically stacked MJ cells circumvent these disadvantages, but existing approaches lack scalable manufacturing processes and suitable interfaces between the stacked cells. Here we present materials and strategies designed to bypass these limitations. The schemes involve (1) printing of microscale...

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INFONA - science communication portal

Search results for: Ralph G. Nuzzo

Multifunctional Materials Strategies for Enhanced Safety of Wireless, Skin‐Interfaced Bioelectronic Devices (Adv. Funct. Mater. 34/2023)

Multifunctional Materials Strategies for Enhanced Safety of Wireless, Skin‐Interfaced Bioelectronic Devices

Biomimetic and Biologically Compliant Soft Architectures via 3D and 4D Assembly Methods: A Perspective

3D Printing High‐Resolution Conductive Elastomeric Structures with a Solid Particle‐Free Emulsion Ink

3D Particle‐Free Printing of Biocompatible Conductive Hydrogel Platforms for Neuron Growth and Electrophysiological Recording

Ionotropic Gradients: Ionic Hydrogels with Biomimetic 4D‐Printed Mechanical Gradients: Models for Soft‐Bodied Aquatic Organisms (Adv. Funct. Mater. 28/2019)

Ionic Hydrogels with Biomimetic 4D‐Printed Mechanical Gradients: Models for Soft‐Bodied Aquatic Organisms

Emulsions: Particle‐Free Emulsions for 3D Printing Elastomers (Adv. Funct. Mater. 21/2018)

Particle‐Free Emulsions for 3D Printing Elastomers

In situ surface stress measurement and computational analysis examining the oxygen reduction reaction on Pt and Pd

Anisotropic Mg Electrodeposition and Alloying with Ag-based Anodes from Non-Coordinating Mixed-Metal Borohydride Electrolytes for Mg Hybrid Batteries

Design, fabrication, and characterization of a proposed microchannel water electrolyzer

Comprehensive energy analysis of a photovoltaic thermal water electrolyzer

3D Scaffolded Nickel–Tin Li‐Ion Anodes with Enhanced Cyclability

Polarization controlled output of electrohydrodynamic jet printed quantum dot embedded photonic crystals for display applications

Region specific enhancement of quantum dot emission using interleaved two-dimensional photonic crystals

Programming matter through strain

Inorganic Materials and Assembly Techniques for Flexible and Stretchable Electronics

Printed high-efficiency quadruple-junction, four-terminal solar cells and modules for full spectrum utilization

High efficiency quadruple junction, four-terminal solar cells and modules by transfer printing

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