Robert Sinko
Northern Illinois University
Composite numberElectromagnetMagnetorheological fluidUltimate tensile strengthSurface modificationEngineeringCreepAdsorptionTransverse planeComposite materialNanotechnologyNanocrystalMoistureNanostructureMaterials scienceSurface energyVibrationStructural materialCelluloseStiffnessCharacterization (materials science)Polymer nanocompositeChemical engineeringNanoporousPolymerMechanicsDynamic Vibration AbsorberMolecular dynamicsStructural engineeringSmart materialNanocompositeActivation energyToughness
22Publications
11H-index
403Citations
Publications 20
Newest
#1Wenjie Xia (NDSU: North Dakota State University)H-Index: 20
#2Xin Qin (NU: Northwestern University)H-Index: 7
Last. Sinan KetenH-Index: 34
view all 5 authors...
Understanding and designing nanoscale interfaces are essential to advancing the thermomechanical performance of polymer nanocomposites reinforced by nanocellulose. In this context, it remains to be understood how disorder introduced on the surfaces of crystals as filler materials during extraction and processing influences interfacial adhesion with glassy polymers. Using atomistic molecular dynamics (MD) simulations, here we systematically explore the interfacial adhesion between nanocellulose a...
27 CitationsSource
#1Nitin K. Hansoge (NU: Northwestern University)H-Index: 4
#2Tianyu Huang (NU: Northwestern University)H-Index: 4
Last. Sinan Keten (NU: Northwestern University)H-Index: 34
view all 6 authors...
Matrix-free polymer-grafted nanocrystals, called assembled hairy nanoparticles (aHNPs), can significantly enhance the thermomechanical performance of nanocomposites by overcoming nanoparticle dispersion challenges and achieving stronger interfacial interactions through grafted polymer chains. However, effective strategies to improve both the mechanical stiffness and toughness of aHNPs are lacking given the general conflicting nature of these two properties and the large number of molecular param...
19 CitationsSource
#1Zonghui Wei (NU: Northwestern University)H-Index: 5
#2Robert Sinko (NU: Northwestern University)H-Index: 11
Last. Erik Luijten (NU: Northwestern University)H-Index: 49
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With increasing environmental concerns about petrochemical-based materials, the development of high-performance polymer nanocomposites with sustainable filler phases has attracted significant attention. Cellulose nanocrystals (CNCs) are promising nanocomposite reinforcing agents due to their exceptional mechanical properties, low weight, and bioavailability. However, there are still numerous obstacles that prevent these materials from achieving optimal performance, including high water adsorptio...
12 CitationsSource
#1Robert Sinko (NIU: Northern Illinois University)H-Index: 11
#2Zdeněk P. Bažant (NU: Northwestern University)H-Index: 86
Last. Sinan Keten (NU: Northwestern University)H-Index: 34
view all 3 authors...
The Pickett effect describes the excess non-additive strain developed during drying of a nanoporous solid material under creep. One explanation for its origins, developed using micromechanical models, is the progressive relaxation of internally developed microprestress. However, these models have not explicitly considered the effects of this microprestress on nanoscale energy barriers that govern the relative motion and displacement between nanopore walls during deformation. Here, we evaluate th...
6 CitationsSource
#1Nitin K. Hansoge (NU: Northwestern University)H-Index: 4
#2Tianyu Huang (NU: Northwestern University)H-Index: 4
Last. Sinan Keten (NU: Northwestern University)H-Index: 34
view all 6 authors...
#1Robert SinkoH-Index: 11
#2Zdeněk P. BažantH-Index: 86
Last. Sinan KetenH-Index: 34
view all 3 authors...
Source
#1Zonghui WeiH-Index: 5
#2Robert SinkoH-Index: 11
Last. Erik LuijtenH-Index: 49
view all 4 authors...
#1Douglas M. Fox (AU: American University)H-Index: 17
#2Rebeca S. Rodriguez (AU: American University)H-Index: 1
Last. Jeffrey W. Gilman (NIST: National Institute of Standards and Technology)H-Index: 50
view all 8 authors...
Cellulose nanocrystals (CNCs) have great potential as sustainable reinforcing materials for polymers, but there are a number of obstacles to commercialization that must first be overcome. High levels of water absorption, low thermal stabilities, poor miscibility with nonpolar polymers, and irreversible aggregation of the dried CNCs are among the greatest challenges to producing cellulose nanocrystal–polymer nanocomposites. A simple, scalable technique to modify sulfated cellulose nanocrystals (N...
25 CitationsSource
#1Robert SinkoH-Index: 11
#2Matthieu Vandamme (University of Paris)H-Index: 23
Last. Sinan Keten (NU: Northwestern University)H-Index: 34
view all 4 authors...
The Pickett effect is the phenomenon of creep enhancement during transient drying. It has been observed for many nanoporous solids, including concrete, wood and Kevlar. While the existing micromechanical models can partially explain this effect, they have yet to consider nanoscale dynamic effects of water in nanopores, which are believed to be of paramount importance. Here, we examine how creep deformations in a slit pore are accelerated by the motion of water due to drying forces using coarse-g...
11 CitationsSource
#1Xin Qin (NU: Northwestern University)H-Index: 7
#2Wenjie Xia (NU: Northwestern University)H-Index: 20
Last. Sinan Keten (NU: Northwestern University)H-Index: 34
view all 4 authors...
Cellulose nanocrystals (CNCs) exhibit impressive interfacial and mechanical properties that make them promising candidates to be used as fillers within nanocomposites. While glass-transition temperature (Tg) is a common metric for describing thermomechanical properties, its prediction is extremely difficult as it depends on filler surface chemistry, volume fraction, and size. Here, taking CNC-reinforced poly(methyl-methacrylate) (PMMA) nanocomposites as a relevant model system, we present a mult...
45 CitationsSource