Sterically Stabilized Multilayer Graphene Nanoshells for Inkjet Printed Resistors

In the field of printed electronics, there is a pressing need for printable resistors, particularly ones where the resistance can be varied without changing the size of the resistor. This work presents ink synthesis and printing results for variable resistance, inkjet-printed patterns of a novel and sustainable carbon nanomaterial—multilayer graphene nanoshells. Dispersed multilayer graphene nanospheres are sterically stabilized by a surfactant (Triton X100), and no post-process is required to achieve the resistive functionality. A surface tension-based adsorption analysis technique is used to determine the optimal surfactant dosage, and a geometric model explains the conformation of adsorbed surfactant molecules. The energetic interparticle potentials between approaching particles are modeled to assess and compare the stability of sterically and electrostatically stabilized multilayer graphene nanoshells. The multilayer graphene nanoshell inks presented here show a promising new pathway toward sustainable and practical printed resistors that achieve variable resistances within a constant areal footprint without post-processing.

Signatures of minimal length from Casimir–Polder forces with neutrons

In this paper, dispersion forces between neutrons are suggested as a probe of the fundamental structure of spacetime. Corrections to standard expressions for the interparticle potentials are obtained through computer algebra system strategies and a novel heuristic argument for comparison with field theory computations. It is confirmed that, to first order in the deformation parameter, the unretarded ([Formula: see text]) van der Waals potential is unchanged. The modified retarded Casimir–Polder potential, obtained from the minimal length zero-point field, compares satisfactorily in both sign and magnitude with rigorous calculations. It is shown that low energy neutron scattering can provide a gain in excess of [Formula: see text] orders of magnitude over atomic physics experiments in constraining corrections due to the existence of a minimal length.

Interparticle potentials in a scalar quantum field theory with a Higgs-like mediating field

We study the interparticle potentials for few-particle systems in a scalar theory with a nonlinear mediating field of the Higgs type. We use the variational method, in a reformulated Hamiltonian formalism of quantum field theory, to derive relativistic three- and four-particle wave equations for stationary states of these systems. We show that the cubic and quartic nonlinear terms modify the attractive Yukawa potentials but do not change the attractive nature of the interaction if the mediating fields are massive.

Interparticle Potentials of Aqueous Alumina Suspensions

In this work the rheological behaviour of aqueous alumina suspensions with solids loadings ranging from 37 to 59 vol% is studied. A complete rheological characterisation is performed by measuring under both controlled rate and controlled stress conditions to obtain expanded flow curves, and by oscillatory tests to determine the elastic moduli. A commercial polyelectrolyte was used as dispersant. The interparticle potentials are calculated considering the electrostatic and the steric contributions. The electrostatic pair potential is estimated through the determination of the elastic modulus, G’, the double layer thickness and the surface potential by using a spatial particle distribution model. The consideration of the steric potential, by using a soft spheres model, produces significant changes in the shape and values of the potential energy curves and allows predicting the stability of suspensions that should coagulate according to the DLVO equation. The colloidal stability and the rheological behaviour are correlated with the green and sintered densities of Al2O3 bodies produced by slip casting.