Effect of Gender Roles and Workplace Violence on the Professional Quality of Life and Wellbeing at Work Among Child Protection Workers.

Exposure to workplace violence puts child protection workers at risk for adverse occupational outcomes. While previous studies have identified protective and risk factors, individual differences in gender roles have yet to be explored. Moving beyond sex, the present study aims to examine the ways in which gender roles influence exposure to workplace violence, professional quality of life, and wellbeing at work among child protection workers. A randomized sample stratified by sex of 301 Canadian child protection workers (male: 15.6%, female: 84.4%) completed validated questionnaires of gender roles, professional quality of life, and wellbeing at work. We assessed mean differences using analyses of covariances controlling for clinical experience and type of work. We then assessed the moderating effect of gender roles on other variables through hierarchical multiple linear regressions. Androgyny (high masculinity and high femininity) was associated with higher scores on positive indicators of professional quality of life and wellbeing at work. However, gender roles showed no significant moderating effect on the relationship between exposure to violence, professional quality of life, and wellbeing at work. Results suggest that androgyny could be related to potential psychosocial benefits for child protection workers.

Filling transitions on rough surfaces: Inadequacy of Gaussian surface models.

We present numerical studies of wetting on various topographic substrates, including random topographies. We find good agreement with recent predictions based on an analytical interface-displacement-type theory, except that we find critical end points within the physical parameter range. As predicted, Gaussian random surfaces are found to behave qualitatively different from non-Gaussian topographies. This shows that Gaussian random processes as models for rough surfaces must be used with great care, if at all, in the context of wetting phenomena.

Acoustic tracking of Cassie to Wenzel wetting transitions.

Many applications involving superhydrophobic materials require accurate control and monitoring of wetting states and wetting transitions. Such monitoring is usually done by optical methods, which are neither versatile nor integrable. This letter presents an alternative approach based on acoustic measurements. An acoustic transducer is integrated on the back side of a superhydrophobic silicon surface on which water droplets are deposited. By analyzing the reflection of longitudinal acoustic waves at the composite liquid-solid-vapor interface, we show that it is possible to track the local evolution of the Cassie-to-Wenzel wetting transition efficiently, as induced by evaporation or the electrowetting actuation of droplets.

Zipping effect on omniphobic surfaces for controlled deposition of minute amounts of fluid or colloids.

When a drop sits on a highly liquid-repellent surface (super-hydrophobic or super-omniphobic) made of periodic micrometer-sized posts, its contact-line can recede with very weak mechanical retention providing that the liquid stays on top of the microsized posts. Occurring in both sliding and evaporation processes, the achievement of low-contact-angle hysteresis (low retention) is required for discrete microfluidic applications involving liquid motion or self-cleaning; however, careful examination shows that during receding, a minute amount of liquid is left on top of the posts lying at the receding edge of the drop. For the first time, the heterogeneities of these deposits along the drop-receding contact-line are underlined. Both nonvolatile liquid and particle-laden water are used to quantitatively characterize what rules the volume distribution of deposited liquid. The experiments suggest that the dynamics of the liquid de-pinning cascade is likely to select the volume left on a specific post, involving the pinch-off and detachment of a liquid bridge. In an applied prospective, this phenomenon dismisses such surfaces for self-cleaning purposes, but offers an original way to deposit controlled amounts of liquid and (bio)-particles at well-targeted locations.

Engineering sticky superomniphobic surfaces on transparent and flexible PDMS substrate.

Following the achievement of superhydrophobicity which prevents water adhesion on a surface, superomniphobicity extends this high repellency property to a wide range of liquids, including oils, solvents, and other low surface energy liquids. Recent theoretical approaches have yield to specific microstructures design criterion to achieve such surfaces, leading to superomniphobic structured silicon substrate. To transfer this technology on a flexible substrate, we use a polydimethylsiloxane (PDMS) molding process followed by surface chemical modification. It results in so-called sticky superomniphobic surfaces, exhibiting large apparent contact angles (>150°) along with large contact angle hysteresis (>10°). We then focus on the modified Cassie equation, considering the 1D aspect of wetting, to explain the behavior of droplets on these surfaces and compare experimental data to previous works to confirm the validity of this model.