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Search Publications by: Edwin P Chan (Fed)

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Displaying 1 - 25 of 57

Scaling the Projectile Perforation Resistance of Soft Materials

June 29, 2023
Katherine Evans, Shawn Chen, Amanda Souna, Stephan J. Stranick, Christopher Soles, Edwin P. Chan
From space dust to ballistic impact, controlling or mitigating a high velocity projectile impact event is a desirable outcome. The design and development of new and novel impact mitigating materials are greatly hindered by the use of macroscale projectile

Self-Assembled Asperities for Pressure Tunable Adhesion

December 16, 2022
Naomi Deneke, Jamie Booth, Edwin P. Chan, Chelsea S. Davis
Control of adhesive strength is important in applications such as soft robotics, pick-and-place manufacturing, flexible and wearable devices, and transfer printing. Due to the diversity of material types, these systems can potentially benefit from adhesive

Pruning the Mechanical Impedance of Three-Dimensional Disordered Networks

February 21, 2022
Marcos Reyes-Martinez, Edwin P. Chan, Christopher Soles, Michael A. Riley, Endao Han, Nidhi Pashine, Kieran Murphy, Heinrich Jaeger, Sidney Nagel, Daniel Reid, Meng Shen, Juan J. de Pablo
Disordered networks, comprised of random arrangements of bonds and nodes, have emerged as materials with the unique ability for independent control over the shear and bulk moduli. Recent computational studies have demonstrated that an extremely high degree

Supersonic Impact Response of Polymer Thin Films via Large-Scale Atomistic Simulations

July 15, 2021
Andrew L. Bowman, Edwin P. Chan, William B. Lawrimore, John K. Newman
Recent nanoscale ballistic testing studies have shown the applicability of nanomaterials for ballistic protection but have raised new questions regarding the nanoscale structure-property relationships that contribute to the enhanced ballistic response of

Cutting to Measure the Elasticity and Fracture of Soft Gels

August 31, 2020
Teresa T. Duncan, Joel M. Sarapas, Adrian P. Defante, Kathryn Beers, Edwin Chan
The fracture properties of very soft and/or brittle materials are challenging to measure directly due to the limitations of existing fracture testing methods. To address this issue, we introduce a razorblade-initiated fracture test (RIFT) to measure the

Importance of Sub-Nanosecond Fluctuations on the Toughness of Polycarbonate Glasses

July 23, 2020
Christopher L. Soles, Kanae N. Ito, Adam B. Burns, Edwin P. Chan, Robert M. Dimeo, Madhu Sudan Tyagi, Albert F. Yee, Jianwei Liu
This article explores the relationship between the nano- to picosecond dynamics, as quantified by elastic incoherent neutron scattering, in polycarbonate (PC) glasses with their mechanical toughness. We establish a robust correlation between mechanical

Using Microprojectiles to Study the Ballistic Limit of Polymer Thin Films

April 1, 2020
Shawn H. Chen, Amanda J. Souna, Christopher L. Soles, Stephan J. Stranick, Edwin P. Chan
The dynamic impact between a particle and a planar material is important in many high impact events, andthereisagrowingneedtocharacterizethemechanicalpropertiesoflight-weightpolymeric materials at dynamic loading conditions. Here, a laser-induced

Insights into the Water Transport Mechanism in Polymeric Membranes from Neutron Scattering

February 5, 2020
Edwin P. Chan, Bradley R. Frieberg, Jacob Daniel Tarver, Madhusudan Tyagi, WenXu Zhnag, Bryan Coughlin, Christopher M. Stafford, Abhishek Roy, Steve Rosenberg, Christopher L. Soles
Polymeric membranes are ubiquitous in a number of transport ap- plications including gas separation, water desalination, solid state batteries and fuel cells. The permeability and selectivity of these membranes are intimately linked to the structure and

Corona Treatment for High-Throughput, Layer-by-Layer Nano-Transfer Molding

April 2, 2019
Michael Deagan, Edwin Chan, Linda S. Schadler, Chaitanya Ullal
Corona discharge treatment offers a facile, robust, and scalable technique for adhesion promotion in nano-transfer molding. In contrast to conventional plasma treatment, which requires vacuum operation, corona treatment at ambient pressure enabled

Poroelastic Fracture Transition of a Biopolymer Gel

May 24, 2018
Edwin P. Chan, Bradley R. Frieberg, Ronald L. Jones, Ray-Shimry Garatsa, John Bachert, Benjamin Crawshaw
Controlling the fracture behavior of thermoreversible biopolymer gels is important in many con- sumer based applications. For example, gelatin gels are used in the encapsulation and release in vitamin capsules, the manipulation of texture in gelled foods

Studying Water and Solute Transport through Desalination Membranes via Neutron Radiography

October 25, 2017
Devin L. Shaffer, Jacob M. LaManna, David L. Jacobson, Daniel S. Hussey, Menachem Elimelech, Edwin P. Chan
Neutron radiography, a non-destructive imaging technique, is applied to study water and solute transport through desalination membranes. Specifically, we use neutron radiography to quantify lithium chloride draw solute concentrations across a thin-film

Nanoscale Pillar-enhanced Tribological Surfaces as Antifouling Membranes

October 24, 2016
Edwin P. Chan, Wansuk Choi, Won-Gi Ahn, Jong-Hyun Park, Hyun W. Jung, Seungkwan Hong, Ji-Young Han, Sangpil Park, Doo-Hyun Ko, Jung-Hyun Lee
We present a nonconventional membrane surface modification approach that utilizes surface topography to manipulate the tribology of foulant accumulation on water desalination membranes via imprinting of submicron titanium dioxide (TiO2) pillar patterns