We present a method to achieve one-way phonon isolation in acoustic waveguides by considering spatio-temporal modulation of material properties. One-way conversion between symmetric and antisymmetric shear horizontal modes an unbounded plate waveguide is numerically demonstrated using this method. Analytical numerical evidence for the possibility mode presented. Possible experimental implementation applications on-chip signal MEMS devices are also suggested.

The unique thermal transport of insulating nanostructures is attributed to the convergence material length scales with mean free paths quantized lattice vibrations known as phonons, enabling promising next-generation transistors, barriers, and thermoelectrics. Apart from size, strain defects are also drastically affect heat when introduced in an otherwise undisturbed crystalline lattice. Here we report first experimental measurements effect both spatially uniform point on conductivity...

We study translocations of gold nanoparticles and nanorods through silicon nitride nanopores present a method for determining the surface charge from magnitude ionic current change as pass pore. Positively charged spherical with average diameters 10 nm nanorod lengths between 44 65 were translocated 40 thick 19 27 in 1, 10, or 100 mM KCl solutions. Nanorod passage decreases ion larger diameter pores, case typical Coulter counters, but it increases smaller nanopores, likely because...

Controlled polymerization is used to make well defined polymers that are assembled into dynamic interpenetrated network materials. Self-healing, toughness and stress relaxation imparted the material through linkages.

Dynamic materials are known for their self-healing, adhesive, and shape memory applications. Interpenetrating networks (IPNs) types of that can hold dual-dynamic crosslinkers to show complementary chemical mechanical properties. There have been a number research studies exploring the dynamic chemistries involved in IPN materials. Not only bond type but also polymer network architecture play an important role governing material In this study, we architectural features as much studying using...

Recent experimental studies have demonstrated a facile route for fabricating large numbers of geometrically uniform colloidal clusters out submicron DNA-functionalized spheres. These are ideally suited use as anisotropic building blocks hierarchical assembly superstructures with symmetries that otherwise inaccessible simple spherical particles. We study computationally the self-assembly cubic, tetrahedral, and octahedral mediated by "bond spheres" dock at specific preferential sites,...

Surprisingly, a few seconds–minutes of compression at room temperature can increase the rate dynamic bond exchange as measured by better self-healing, even for thermoresponsive bonds which do not under ambient conditions.

Phenyl vinyl ketone (PVK) is known for its responsiveness to light, with initiation promoted under visible light and degradation of poly(PVK) UV radiation. Thus, expensive radical sources such as photocatalysts initiators can be substituted by PVK promote intrinsic photoinitiation giving well-defined polymers. Homo polymers block copolymers are readily synthesized reversible deactivation polymerization techniques; this study the first approach formation through intrinsically generated...

Nanocrystal superlattices are materials formed by assembly of monodisperse nanocrystal building blocks that tunable in composition, size, shape, and surface functionalization. Such offer the potential to realize unprecedented combinations physical properties, but theoretical prediction such particularly elastic remains a challenge. Here we report Young's moduli, bulk Poisson's ratios CdSe computed from fully atomistic molecular dynamics simulations, coarse grained models, effective medium...

A computational study of thermal conductivity and phonon dispersion gold nanocrystal superlattices is presented. Phonon curves, reported here for the first time from combined molecular dynamics lattice calculations, show multiple phononic band gaps consist many more branches than simple atomic crystals. Fully atomistic three dimensional calculations using Green Kubo method are also performed on these materials. Thermal observed to increase increasing core size decrease surface ligand...

Abstract Dynamically cross‐linked polymer networks have attracted significant interest in recent years due to their unique and improved properties including increased toughness, malleability, shape memory, self‐healing. Here, a computational study on the mechanical behavior of dynamically is presented. Coarse grained models for different network configurations are established using molecular dynamics (MD) simulations predicted. Consistent with experimental measurements, simulation results...

Abstract In this work we discuss the idea of one-way acoustic signal isolation in low dimensional nanoelectromechanical oscillators. We report a theoretical study showing that conversion between in-phase and anti-phase vibrational modes double layer graphene nanoribbon is achieved by introducing spatio-temporal modulation system properties. The required length order to reach full two subsequently calculated. Generalization method beyond nanoribbons realization NEMS isolator are also discussed.

Abstract Motivated by recent advances in synthesis and characterization of complex colloidal building blocks, the self‐assembly behavior transport properties novel superstructures multielement molecules are explored with applications areas such as phononics, photonics, photovoltaics. Using an analytical/computational framework, connectivity landscape various shapes is examined to propose new multicomponent superstructure phases that can self‐assemble from binary mixtures these blocks. The...

In this paper we report, for the first time, phononic band structure of nanocrystal superlattices with different shapes, sizes, compositions, and structures. For composed a single type core, show that by merely changing shape bandgap width is affected significantly: shapes higher surface to volume ratio result in larger bandgaps. Furthermore, structural changes are shown be important as face-centered cubic body-centered structures same core size present 28 76% smaller bandgaps compared...

Diels–Alder based dynamic polymer materials are reinforced with carbon nanotubes, to give self-healing properties from the matrix and enhanced mechanical electrical nanotubes.

Recent experimental and theoretical studies demonstrate that prefabricated micron-scale colloidal clusters functionalized with DNA oligomers offer a practical way for introducing anisotropic interactions, significantly extending the scope of DNA-mediated assembly, enabling formation interesting crystalline superstructures are otherwise inaccessible short-ranged, spherically symmetric interactions. However, it is apparent high-dimensional parameter space defines geometric interaction...

Hyperelastic models developed by Gent, Ogden, and Dobrynin are modified to include a strain rate-dependent element. This rate dependence accounts for the breaking of temporary bonds in materials as opposed stretching polymer chains. Accounting material's mechanical response gives ability extract modulus due permanent bonds, hardening, relaxation time dynamic materials. These were tested against wide range elastomeric The applicable across many network polymers, showing clear effects...

We present a theoretical study of nanorod translocation events through solid-state nanopores different sizes which result in positive or negative ion conductance changes. Using models, we show that changes up happen for nanopore diameters smaller than transition diameter ${d}_{t}$, and down occur larger ${d}_{t}$. investigate the underlying physics such phenomena describe significance electric double-layer effects with small diameters. Furthermore, large diameters, it is shown geometric...

Colloidal crystals provide a versatile platform for designing phononic metamaterials with exciting applications sound and heat management. New advances in the synthesis self-assembly of anisotropic building blocks such as colloidal clusters have expanded library available micro- nano-scale ordered multicomponent structures. Diamond-like supercrystals formed by spherical particles are notable examples that include rich family crystal symmetries diamond, double zinc-blende, MgCu2. This work...

Abstract One of the key challenges in study self‐assembly with synthetic particles is how to build finite‐sized constructs that resemble self‐limiting structures such as well‐known proteins and biomolecules found nature. Inspired by this concept, a novel method for realizing colloidal clusters establishing design rules obtain desired final using bottom‐up assembly approach presented. The identified work will be “locked” well‐defined configuration structure morphologies not allow them grow...

Over the past two decades, colloidal particles with a variety of shapes, sizes, and compositions have been synthesized characterized successfully. One most important applications for building blocks is to engineer functional structures as mechanical, electrical, optical metamaterials. However, complex interaction dynamics between well sophisticated structure-property relationships make it challenging design predictable target properties. In this paper, we implement an inverse material...

Crosslinked polymer materials provide tremendous opportunities for delivering unique material properties a wide variety of applications such as shape-memory and self-healing materials, aerospace biomedical systems. Most crosslinked networks investigated to date are designed based on covalent or noncovalent crosslinkers that include two-ended connections the backbone base. In this paper, we investigate topic multi-arm crosslinking using computational platform. We take advantage molecular...

This works presents a computational study of thermal properties nanoparticle assemblies. Thermal management in micro- and nano-scale structures is great significance applications such as electronic devices. We investigate phonon transport hybrid organic-inorganic nanocrystal assemblies using Molecular Dynamics simulations. The results demonstrate the dependence conductivity on various features nanocrystalline provide insight for future investigation phononic spectrum superstructures with...

DNA-mediated assembly of colloidal particles can be utilized to produce a variety structures which may have desirable phononic, photonic, or electronic transport properties. Recent developments in linker-mediated processes allow for interactions coordinated between many different types more easily and with fewer unique sequences than direct hybridization. However, the dynamics self-assembly becomes increasingly complex when coordinating three distinct interacting elements. In such cases...