A Bibliography

Besides work he has produced on topics related to the spirit or mission of his religious congregation - for the benefit of his fellow Marianists or members of the Marianist Family - Father Koehler has also written numerous lectures, retreat conferences, homilies, articles for popular (less scientific) religious publications, and book reviews. While selected examples of such works have been included in this bibliography, it has been reserved primarily - though not exclusively - for his scholarly, professional and mariological works. Some translated works (so indicated) are included here: it was not possible to trace them all

Phil Powers, Mike Foley, Harry Mushenheim: Marian Library Oral Histories

Kayla Harris interviewed Phil Powers, Mike Foley, and Harry Mushenheim on September 11, 2018 about their experiences as volunteers for the Marian Library. In this interview they discuss their work on the train set with University of Dayton engineering students, the community of volunteers from St. Luke’s Parish and hopes for the Marian Library in the future.https://ecommons.udayton.edu/ul_oral_histories/1000/thumbnail.jp

Active colloids in complex fluids

We review recent work on active colloids or swimmers, such as self-propelled microorganisms, phoretic colloidal particles, and artificial micro-robotic systems, moving in fluid-like environments. These environments can be water-like and Newtonian but can frequently contain macromolecules, flexible polymers, soft cells, or hard particles, which impart complex, nonlinear rheological features to the fluid. While significant progress has been made on understanding how active colloids move and interact in Newtonian fluids, little is known on how active colloids behave in complex and non-Newtonian fluids. An emerging literature is starting to show how fluid rheology can dramatically change the gaits and speeds of individual swimmers. Simultaneously, a moving swimmer induces time dependent, three dimensional fluid flows, that can modify the medium (fluid) rheological properties. This two-way, non-linear coupling at microscopic scales has profound implications at meso- and macro-scales: steady state suspension properties, emergent collective behavior, and transport of passive tracer particles. Recent exciting theoretical results and current debate on quantifying these complex active fluids highlight the need for conceptually simple experiments to guide our understanding.Comment: 6 figure

Nature Is My Home

Figures depicting the nativity of Jesus, created by Harold Mushenheim in 2010. The heads are sculpted clay, and the bodies are cloth-wrapped wire armature. The clothing was sewn by Cecilia Mushenheim. Exhibition label originally written by Fr. Johann G. Roten, S.M. for exhibit entitled At The Manger: No Place Like Home held at Roesch Library, University of Dayton.https://ecommons.udayton.edu/imri_creches/1150/thumbnail.jp

Controlling nanoslot overlimiting current with the depth of a connecting microchamber

The overlimiting ion flux, in excess of the limiting-value stipulated by diffusion, across a wide nanoslot (of fixed depth) is shown to be sensitively dependent on the depth of the connecting microchamber at one end of the nanoslot, which controls the onset of a vortex instability that specifies the dimension of the concentration polarization layer responsible for overlimiting behavior. Simple scaling arguments relating the microchamber depth to the effective fluid viscosity produce experimentally verified scaling dependence of the polarization layer length, the onset voltage for overlimiting behavior and the overlimiting current on the microchamber depth

Design of Responsive and Active (Soft) Materials Using Liquid Crystals

Liquid crystals (LCs) are widely known for their use in liquid crystal displays (LCDs). Indeed, LCDs represent one of the most successful technologies developed to date using a responsive soft material: An electric field is used to induce a change in ordering of the LC and thus a change in optical appearance. Over the past decade, however, research has revealed the fundamental underpinnings of potentially far broader and more pervasive uses of LCs for the design of responsive soft material systems. These systems involve a delicate interplay of the effects of surface-induced ordering, elastic strain of LCs, and formation of topological defects and are characterized by a chemical complexity and diversity of nano-and micrometer-scale geometry that goes well beyond that previously investigated. As a reflection of this evolution, the community investigating LC-based materials now relies heavily on concepts from colloid and interface science. In this context, this review describes recent advances in colloidal and interfacial phenomena involving LCs that are enabling the design of new classes of soft matter that respond to stimuli as broad as light, airborne pollutants, bacterial toxins in water, mechanical interactions with living cells, molecular chirality, and more. Ongoing efforts hint also that the collective properties of LCs (e.g., LC-dispersed colloids) will, over the coming decade, yield exciting new classes of driven or active soft material systems in which organization (and useful properties) emerges during the dissipation of energy