Xin Qin
Northwestern University
Penetration (firestop)Composite numberElasticity (economics)Surface modificationGlass transitionBiophysicsViscosityNanomechanicsHydrostatic equilibriumDissipationFinite element methodBallistic limitNanomaterialsElastic energyComposite materialBiomimeticsNanotechnologyNanocrystalMicroscale chemistryNanostructureThin filmMaterials scienceModulusSurface energyStrain energyStructural materialPhotonicsScience, technology and societySelf-assemblySuperposition principlePitch anglePerforation (oil well)NanocelluloseBiomaterialCelluloseStiffnessBallistic impactContext (language use)Characterization (materials science)Mechanical PhenomenaMembrane tensionGrapheneCompressive strengthPolymer nanocompositeMembraneChemical engineeringElastic modulusNanoscopic scaleProjectilePolymerAmorphous solidMechanicsMolecular dynamicsSpallVolume fractionBallisticsClassical mechanicsAdhesionPotential energyCompressibilityMicrostructureReflection (physics)NanocompositeToughness
11Publications
7H-index
189Citations
Publications 11
Newest
#1Xin Qin (NU: Northwestern University)H-Index: 7
#2Benjamin C. Marchi (NU: Northwestern University)H-Index: 1
Last. Sinan Keten (NU: Northwestern University)H-Index: 34
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The Bouligand structure features a helicoidal (twisted plywood) layup of fibers that are uniaxially arranged in-plane and is a hallmark of biomaterials that exhibit outstanding impact resistance. Despite its performance advantage, the underlying mechanisms for its outstanding impact resistance remain poorly understood, posing challenges for optimizing the design and development of bio-inspired materials with Bouligand microstructures. Interestingly, many bio-sourced nanomaterials, such as cellul...
5 CitationsSource
#1Wenjie Xia (NDSU: North Dakota State University)H-Index: 20
#2Xin Qin (NU: Northwestern University)H-Index: 7
Last. Sinan KetenH-Index: 34
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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...
23 CitationsSource
#1Bharath Natarajan (Georgetown University)H-Index: 15
#2Ajay Krishnamurthy (NIST: National Institute of Standards and Technology)H-Index: 8
Last. Jeffrey W. Gilman (NIST: National Institute of Standards and Technology)H-Index: 50
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24 CitationsSource
#1Yao Zhang (NU: Northwestern University)H-Index: 8
#2Zhaoxu Meng (NU: Northwestern University)H-Index: 13
Last. Sinan Keten (NU: Northwestern University)H-Index: 34
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Therapeutic agent loaded micro and nanoscale particles as high-velocity projectiles can penetrate cells and tissues, thereby serving as gene and drug delivery vehicles for direct and rapid internalization. Despite recent progress in developing micro/nanoscale ballistic tools, the underlying biophysics of how fast projectiles deform and penetrate cell membranes is still poorly understood. To understand the rate and size-dependent penetration processes, we present coarse-grained molecular dynamics...
5 CitationsSource
#1Zhaoxu Meng (NU: Northwestern University)H-Index: 13
#2Jialun Han (NU: Northwestern University)H-Index: 1
Last. Sinan Keten (NU: Northwestern University)H-Index: 34
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Abstract Ballistic performance of ultra-thin graphene membranes have recently been investigated at the micro and nanoscale. Two open questions that remain unanswered are, how graphitic plates behave when they can no longer be treated as a thin membrane, and how the projectile shape influences the perforation resistance of plates of varying thicknesses. Through coarse-grained molecular dynamics simulations, we show that beyond a critical plate thickness, a cylindrical projectile penetrates the pl...
15 CitationsSource
#1Zhaoxu Meng (NU: Northwestern University)H-Index: 13
#2Amit Kumar Singh (NU: Northwestern University)H-Index: 7
Last. Sinan Keten (NU: Northwestern University)H-Index: 34
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Abstract Recent microscale ballistic experiments have revealed that multilayer graphene membranes exhibit exceptionally high ballistic limit velocity and specific penetration energy. A key feature contributing to the exceptional performance of these systems is the cone wave that develops at impact, which propagates radially at a very high speed for ultra-light and stiff graphene membranes, distributing the kinetic energy of the projectile away from the impact zone. Current theories on ballistic ...
17 CitationsSource
#1Xin Qin (NU: Northwestern University)H-Index: 7
#2Shizhe Feng (NU: Northwestern University)H-Index: 4
Last. Sinan Keten (NU: Northwestern University)H-Index: 34
view all 4 authors...
Cellulose nanopaper exhibits outstanding stiffness, strength, and toughness that originate from the exceptional properties of constituent cellulose nanocrystals (CNCs). However, it remains challenging to link the nanoscale properties of rod-like CNCs and their structural arrangements to the macroscale performance of nanopaper in a predictive manner. Here we address this need by establishing an atomistically informed coarse-grained model for CNCs via a strain energy conservation paradigm and simu...
17 CitationsSource
#1Xin Qin (NU: Northwestern University)H-Index: 7
#2Shizhe Feng (NU: Northwestern University)H-Index: 4
Last. Sinan KetenH-Index: 34
view all 3 authors...
#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...
42 CitationsSource
#1Robert Sinko (NU: Northwestern University)H-Index: 11
#2Xin Qin (NU: Northwestern University)H-Index: 7
Last. Sinan Keten (NU: Northwestern University)H-Index: 34
view all 3 authors...
Cellulose nanocrystals (CNCs) are naturally occurring, structural material building blocks, which exhibit great potential for future multifunctional nanocomposites due to their high bioavailability, low cost, and impressive mechanical properties. Recent research on CNCs has focused on isolation techniques, crystal morphology, mechanical property characterization, and development of hierarchical materials, including CNC thin films and CNC-based nanocomposites. These studies have revealed that the...
26 CitationsSource