Explanipedia

Laser ablative patterning of B <sub>4</sub> C and MoAlB ceramics for hydrophobic surfaces Open

Samuel Ruíz, Yongchul Yoo, Luke Wadle, Xin Chen, Nan Li , et al. · 2023

Through a novel laser ablative patterning (LAP) process, the present work reported the increase in wetting contact angle of two ceramic materials, boron carbide (B 4 C) and molybdenum aluminum boride (MoAlB). The LAP technique employed pic…

Topological control of polystyrene-silica core-shell microspheres Open

Zane A. Grady, Alexandria Z. Arthur, Christopher J. Wohl · 2018

Mitigation of Polystyrene Microsphere Surface Contamination for Wind Tunnel Applications Open

Christopher J. Wohl, Pacita I. Tiemsin, Samuel J. Robbins, Ashle Page · 2018

Polystyrene latex (PSL) microspheres have been utilized as seed material for flow visualization in wind tunnels. However, PSL microspheres have been observed to strongly adhere to wind tunnel and model surfaces. Surface contamination on th…

Further insight into the mechanism of poly(styrene-<i>co</i>-methyl methacrylate) microsphere formation Open

Samantha I. Applin, Russell C. Schmitz, Pacita I. Tiemsin, Jan Genzer, John W. Connell , et al. · 2017

Polymeric microspheres have been utilized in a broad range of applications ranging from chromatographic separation techniques to analysis of air flow over aerodynamic surfaces. The preparation of microspheres from many different polymer fa…

Piezoelectric Floating Element Shear Stress Sensor for the Wind Tunnel Flow Measurement Open

Taeyang Kim, Aditya Saini, Jinwook Kim, Ashok Gopalarathnam, Yong Zhu , et al. · 2016

A piezoelectric sensor with a floating element was developed for direct measurement of flow induced shear stress. The piezoelectric sensor was designed to detect the pure shear stress while suppressing the effect of normal stress generated…

Controlled Contamination of Epoxy Composites with PDMS and Removal by Laser Ablation Open

Frank L. Palmieri, Rodolfo Ledesma, Daniel Cataldo, Yi Lin, Christopher J. Wohl , et al. · 2016

Surface preparation is critical to the performance of adhesively bonded composites. During manufacturing, minute quantities of mold release compounds are inevitably deposited on faying surfaces and may compromise bond performance. To ensur…

A piezoelectric shear stress sensor Open

Taeyang Kim, Aditya Saini, Jinwook Kim, Ashok Gopalarathnam, Yong Zhu , et al. · 2016

In this paper, a piezoelectric sensor with a floating element was developed for shear stress measurement. The piezoelectric sensor was designed to detect the pure shear stress suppressing effects of normal stress generated from the vortex …

Synthesis, characterization and evaluation of urethane co-oligomers containing pendant fluoroalkyl ether groups Open

Jereme R. Doss, Michelle H. Shanahan, Christopher J. Wohl, John W. Connell · 2016

Latent Hardeners for the Assembly of Epoxy Composites Open

Frank L. Palmieri, Christopher J. Wohl, John W. Connell, Zoar Mercado, Jordan Galloway · 2016

Large-scale composite structures are commonly joined by secondary bonding of molded-and-cured thermoset components. This approach may result in unpredictable joint strengths. In contrast, assemblies made by co-curing, although limited in s…

Effect of Molecular Flexibility upon Ice Adhesion Shear Strength Open

Joseph G. Smith, Christopher J. Wohl, Richard E. Kreeger, José Palacios, Taylor Knuth , et al. · 2016

Ice formation on aircraft surfaces effects aircraft performance by increasing weight and drag leading to loss of lift. Current active alleviation strategies involve pneumatic boots, heated surfaces, and usage of glycol based de-icing fluid…

Shear Stress Sensing with Elastic Microfence Structures Open

Alexandra A. Cisotto, Frank L. Palmieri, Yi Lin, Aditya Saini, Jinwook Kim , et al. · 2015

In this work, elastic microfences were generated for the purpose of measuring shear forces acting on a wind tunnel model. The microfences were fabricated in a two part process involving laser ablation patterning to generate a template in a…

Influence of Surface Properties and Impact Conditions on Adhesion of Insect Residues Open

Christopher J. Wohl, Joseph G. Smith, John W. Connell, Emilie J. Siochi, Jereme R. Doss , et al. · 2015

Insect residues can cause premature transition to turbulent flow on laminar flow airfoils. Engineered surfaces that mitigate the adhesion of insect residues provide, therefore, a route to more efficient aerodynamics and reduced fuel burn r…

Particle Image Velocimetry Applications Using Fluorescent Dye-doped Particles Open

Brian J. Petrosky, Pietro Maisto, K. Todd Lowe, Matthieu A. Andre, Philippe M. Bardet , et al. · 2015

Polystyrene latex sphere particles are widely used to seed flows for velocimetry techniques such as Particle Image Velocimetry (PIV) and Laser Doppler Velocimetry (LDV). These particles may be doped with fluorescent dyes such that signals …

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