A facile approach for selective detection of arsenite ions using plasmonic behaviour of silver nanoparticles.

A specific reagent/aptamer-free easy redox strategy between silver(I) moieties present in a citrate-stabilized colloidal silver nanoparticle (NP) system and arsenite ions is described that enables plasmonic change of AgNPs for the selective quantification of arsenite ions in the range of 0 to 30 µM with a low limit of quantification value of 50 nM (5.3 ppb).

Exponential Decay of Truncated Correlations for the Ising Model in any Dimension for all but the Critical Temperature.

The truncated two-point function of the ferromagnetic Ising model on Z d ( d ≥ 3 ) in its pure phases is proven to decay exponentially fast throughout the ordered regime ( ß > ß c and h = 0 ). Together with the previously known results, this implies that the exponential clustering property holds throughout the model's phase diagram except for the critical point: ( ß , h ) = ( ß c , 0 ) .