125 citations · 210 across the 11 of their papers we have counts for
13 papers
Impact of Nanometer-Thin Stiff Layer on Adhesion to Rough Surfaces
Shubhendu Kumar, Babu Gaire, Bo Persson +1
Adhesion requires molecular contact, and natural adhesives employ mechanical gradients to achieve complete (conformal) contact to maximize adhesion. Intuitively, one expects that t…
Measurement of Nanoscale Interfacial Contact Area Using Vibrational Spectroscopy
Utkarsh Patil, Stephen Merriman, Shubhendu Kumar +1
Understanding the extent of contact between objects is crucial for surface-driven phenomena in the natural world. While interactions are known to occur at subnanometer-length scale…
Why soft contacts are stickier when breaking than when making them
Antoine Sanner, Nityanshu Kumar, Ali Dhinojwala +2
Insects, pick-and-place manufacturing, engineered adhesives, and soft robots employ soft materials to stick to surfaces even in the presence of roughness. Experiments show that the…
Humidity-induced glass transition of a polyelectrolyte brush creates switchable friction in air
Stephen Merriman, Saranshu Singla, Ali Dhinojwala
Polymer brushes have found extensive applications as responsive surfaces, particularly in achieving tunable friction in solvent environments. Despite recent interest in extending t…
Mechanism of Structural Colors in Binary Mixtures of Nanoparticle-based Supraballs
Christian M. Heil, Anvay Patil, Bram Vanthournout +9
Inspired by structural colors in avian species, various synthetic strategies have been developed to produce non-iridescent, saturated colors using nanoparticle assemblies. Mixtures…
Modeling Structural Colors from Disordered One-Component Colloidal Nanoparticle-based Supraballs using Combined Experimental and Simulation Techniques
Anvay Patil, Christian M. Heil, Bram Vanthournout +8
Bright, saturated structural colors in birds have inspired synthesis of self-assembled, disordered arrays of assembled nanoparticles with varied particle spacings and refractive in…
Structural Color Production in Melanin-based Disordered Colloidal Nanoparticle Assemblies in Spherical Confinement
Anvay Patil, Christian M. Heil, Bram Vanthournout +8
Melanin is a ubiquitous natural pigment that exhibits broadband absorption and high refractive index. Despite its widespread use in structural color production, how the absorbing m…
Dependence of Adhesive Friction on Surface Roughness and Elastic Modulus
Daniel Maksuta, Siddhesh Dalvi, Abhijeet Gujrati +3
When adhesive elastomeric materials slide over hard rough surfaces at low velocities, there are two primary dissipative mechanisms that control how friction changes with sliding ve…
Adhesive forces inhibit underwater contact formation for a soft-hard collision
Mengyue Sun1, Nityanshu Kumar1, Ali Dhinojwala +1
Thermodynamics tells us to expect underwater contact between two hydrophobic surfaces to result in stronger adhesion compared to two hydrophilic surfaces. However, presence of wate…
Transition in the Acid-Base Component of Surface Free Energy of Ice upon the Premelting of its Second Molecular Bilayer
Nathaniel Orndorf, Saranshu Singla, Ali Dhinojwala
Molecular disordering of the ice surface occurs below the bulk melting temperature of 273 K, termed surface premelting. The top-most molecular layer begins gradually premelting at…
Linking energy loss in soft adhesion to surface roughness
Siddhesh Dalvi, Abhijeet Gujrati, Subarna R. Khanal +3
A mechanistic understanding of adhesion in soft materials is critical in the fields of transportation (tires, gaskets, seals), biomaterials, micro-contact printing, and soft roboti…
Competition between delamination and fracture in multiple peeling problems
Lucas Brely, Federico Bosia, Ali Dhinojwala +1
Adhesive attachment systems consisting of multiple tapes or strands are commonly found in nature, for example in spider web anchorages or in mussel byssal threads, and their struct…
Efficient Generation of Model Bulk Heterojunction Morphologies for Organic Photovoltaic Device Modeling
Michael C. Heiber, Ali Dhinojwala
Kinetic Monte Carlo (KMC) simulations have been previously used to model and understand a wide range of behaviors in bulk heterojunction (BHJ) organic photovoltaic devices, from fu…