A5075766557- Additive Manufacturing and 3D Printing Technologies
- Polymer composites and self-healing
- Silicone and Siloxane Chemistry
- Polymer Nanocomposites and Properties
- Induction Heating and Inverter Technology
- Advanced Sensor and Energy Harvesting Materials
- Polymer crystallization and properties
- Supercapacitor Materials and Fabrication
- Epoxy Resin Curing Processes
- Ion-surface interactions and analysis
- Photopolymerization techniques and applications
- Fiber-reinforced polymer composites
- Magnetic Properties and Applications
- NMR spectroscopy and applications
- Advanced MRI Techniques and Applications
- Force Microscopy Techniques and Applications
- Cellular and Composite Structures
- Advanced DC-DC Converters
- Conducting polymers and applications
- Thermal and Kinetic Analysis
- Synthesis and properties of polymers
- Fuel Cells and Related Materials
- Graphene research and applications
- Renewable energy and sustainable power systems
- Manufacturing Process and Optimization
Lawrence Livermore National Laboratory
2015-2024
University of California, Davis
2020
Lawrence Livermore National Security
2015-2017
University of Strathclyde
2008-2011
Atomic Weapons Establishment
2008
International Union of Pure and Applied Chemistry
2007
Rzeszów University of Technology
2002
Abstract Here we report the first example of a class additively manufactured carbon fiber reinforced composite (AMCFRC) materials which have been achieved through use latent thermal cured aromatic thermoset resin system, an adaptation direct ink writing (DIW) 3D-printing technology. We developed means printing high performance composites, allow component and fluid to be aligned in three dimensions via controlled micro-extrusion subsequently into complex geometries. Characterization our...
We report the synthesis of a three-dimensional (3D) macroassembly graphene sheets with electrical conductivity (∼10(2) S m(-1)) and Young's modulus (∼50 MPa) orders magnitude higher than those previously reported, super-compressive deformation behavior (∼60% failure strain), surface areas (>1300 m(2) g(-1)) approaching theoretically maximum values.
Drawbacks of current carbon dioxide capture methods include corrosivity, evaporative losses and fouling. Separating the solvent from infrastructure effluent gases via microencapsulation provides possible solutions to these issues. Here we report materials that may enable low-cost energy-efficient flue gas. Polymer microcapsules composed liquid carbonate cores highly permeable silicone shells are produced by microfluidic assembly. This motif couples capacity selectivity sorbents with high...
Shape memory polymers (SMPs) are attractive materials due to their unique mechanical properties, including high deformation capacity and shape recovery. SMPs easier process, lightweight, inexpensive compared metallic counterparts, alloys. However, limited relatively small form factors low recovery stresses. Lightweight, micro-architected composite may overcome these size limitations offer the ability combine functional properties (e.g., electrical conductivity) with behavior. Fabrication of...
Realization of macroscale three‐dimensional isotropic carbons that retain the exceptional electrical and mechanical properties graphene sheets remains a challenge. Here, method for fabricating graphene‐derived (GDCs) with approaching those individual is reported. This synthesis scheme relies on direct cross‐linking via functional groups in oxide to maximize electronic transport reinforcement between partial restacking increase material density about 1 g cm ‐3 . These GDCs exhibit 3–6 orders...
Abstract 3D printing of polymeric foams by direct-ink-write is a recent technological breakthrough that enables the creation versatile compressible solids with programmable microstructure, customizable shapes, and tunable mechanical response including negative elastic modulus. However, in many applications success these printed materials as viable replacement for traditional stochastic critically depends on their performance micro-architectural stability while deployed under long-term...
Abstract Silicone elastomers have broad versatility within a variety of potential advanced materials applications, such as soft robotics, biomedical devices, and metamaterials. A series custom 3D printable silicone inks with tunable stiffness is developed, formulated, characterized. The exhibit excellent rheological behavior for printing, observed from the printing porous structures controlled architectures. Herein, capability to tune via careful control over chemistry, network formation,...
We report 3D printing of a ‘pure’ thermal cure cyanate ester for the fabrication robust printed structures through formulation, tailoring and post processing custom ‘ink’ Direct Ink Writing.
Recent advances in additive manufacturing, specifically direct ink writing (DIW) and ink-jetting, have enabled the production of elastomeric silicone parts with deterministic control over structure, shape, mechanical properties. These new technologies offer rapid prototyping advantages find applications various fields, including biomedical devices, prosthetics, metamaterials, soft robotics. Stereolithography (SLA) is a complementary approach ability to print finer features potentially higher...
Octa-OH-functional POSS has been incorporated into a model polyurethane elastomer as comparatively massive and notionally "robust" 3-dimensional cross-linking core. The effects of this moiety on the morphology molecular dynamics system are studied over range size time scales. Microscopy, scattering, spectroscopic, thermal, dielectric techniques, in agreement with each other, show that covalent inclusion particles restricts microphase separation, inhibits formation hard-block domains,...
This article studies the nanoscale structure of highly crystalline sp<sup>2</sup>-bonded boron nitride aerogels synthesized <italic>via</italic> carbothemic reduction from graphene aerogels, and its relationship to chemical physical properties.
Elastomeric polysiloxane nanocomposites with elongations of >5000% (more than 3× greater any previously reported material) excellent shape recovery are presented. Highly deformable materials desirable for the fabrication stretchable implants and microfluidic devices. No crosslinking or domain formation is observed by a variety analytical techniques, suggesting that their elastomeric behavior caused polymer chain entanglements.
Marine sediments are globally significant sources of dissolved organic matter (DOM) to the oceans, but biogeochemical role pore-water DOM in benthic and marine carbon cycles remains unclear due a lack understanding about its molecular composition. To help fill this knowledge gap, we used 1H nuclear magnetic resonance (NMR) spectroscopy examine depth variability composition anoxic Santa Barbara Basin, California Borderland. Proton detected spectra were acquired on whole samples without...
Abstract Water‐vapor‐uptake experiments were performed on a silica‐filled poly(dimethylsiloxane) (PDMS) network and modeled by using two different approaches. The data was established methods the model parameters used to predict moisture uptake in sample. predictions are reasonably good, but not outstanding; many of shortcomings modeling discussed. A high‐fidelity approach is derived improve diffusion. Our captures physics kinetics diffusion adsorption/desorption, simultaneously. It predicts...
We use ensembles of quantum-based molecular dynamics simulations to predict the chemical reactions that follow radiation-induced excitations phenyl groups in a model copolymer polydimethylsiloxane and polydiphenylsiloxane. Our span wide range highly porous condensed phase densities include both wet dry conditions. observe absence water, excited tend abstract hydrogen from other methyl or side produce benzene, with under-hydrogenated group initiating subsequent intrachain cyclization...
Abstract Novel electron beam crosslinked polyurethane shape memory polymers with advanced processing capabilities and tunable thermomechanical properties have been synthesized characterized. We demonstrate the ability to manipulate crosslink density in order finely tune rubbery modulus, strain capacity, ultimate tensile strength, recovery stress, glass transition temperature. This objective is accomplished for first time a low‐molecular‐weight polymer system through precise engineering of...