The Viscous Properties of Diols. V. 1,2–Hexanediol in Water and Butanol Solutions

Abstract

The paper presents the results of viscosity measurements performed on 1,2-hexanediol in water and n-, s- and t-butanol solutions in the whole range of concentrations, at different temperatures. The activation energy for viscous flow of the solutions and the viscosity excess, were determined.

Rayleigh–Taylor instability by segregation in an evaporating multicomponent microdroplet

“…In this expression, is the net acceleration imposed on the interface of the droplet, where is the gravitational acceleration and is the droplet contact angle (see figure 7); is the Atwood number given by , where and are the density of the mixture and of pure 1,2-hexanediol, respectively (Romero etal. 2007) and is the averaged kinematic viscosity, where mPa s and mPa s are the dynamic viscosities of the mixture and of pure 1,2-hexanediol, respectively (Jarosiewicz, Czechowski & Jadzyn 2004). Here , the low-density liquid, which is 1,2-hexanediol, moves into the heavy fluid in the upper layer (Sharp 1984).…”

“…We estimate the most unstable wavelength of the Rayleigh-Taylor instability in our system to be λ m ≈ 4π(ν 2 /(g s At)) 1/3 ≈ 10 3 μm (Olson & Jacobs 2009). In this expression, g s = g sin(θ ) is the net acceleration imposed on the interface of the droplet, where g ≈ 9.8 m s −2 is the gravitational acceleration and θ ≈ 35 • is the droplet contact angle (see figure 7di,dii); At is the Atwood number given by At = (ρ m − ρ H )/(ρ m + ρ H ) ≈ 2.3 × 10 −2 , where ρ m = 997 kg m −3 and ρ H = 952 kg m −3 are the density of the mixture and of pure 1,2-hexanediol, respectively (Romero et al 2007) and ν = (μ m + μ H )/(ρ m + ρ H ) is the averaged kinematic viscosity, where μ m ≈ 2 mPa s and μ H ≈ 80 mPa s are the dynamic viscosities of the mixture and of pure 1,2-hexanediol, respectively (Jarosiewicz, Czechowski & Jadzyn 2004). Here At 1, the low-density liquid, which is 1,2-hexanediol, moves into the heavy fluid in the upper layer (Sharp 1984).…”

Elution with 1,2-Hexanediol Enables Coupling of ICPMS with Reversed-Phase Liquid Chromatography under Standard Conditions

“…However, the viscosity of its aqueous mixtures drops sharply with temperature. 36 We therefore recommend operating at a column temperature of ≥45 °C to ensure compatibility with standard 4.00 × 10 7 Pa (400 bar) pumps at a chromatographic column length of 250 mm. At 30% v/v 1,2-hexanediol and a mobile phase flow rate of 1.0 mL min –1 , the resulting backpressure using a reversed-phase (C18) column with a length of 250 mm, 4.6 mm i.d., and 5 μm particle size (Phenomenex Synergi Fusion-RP) was 2.80 × 10 7 Pa (280 bar) at 50 °C column temperature.…”

Wetting of two-component drops: Marangoni contraction versus autophobing

“…The region of the substrate that is sampled by the liquid in determining the stationary θ is no larger than 10 µm [44]. The timescale associated with forming the equilibrium adsorption layer within this region is smaller than the spreading timescale [45], which is relatively long due to the high viscosity of 1,2-HD (η ≈ 82 mPa•s [46]).…”