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Background: Scholars agree that reciprocity is a cornerstone of service-learning and community engagement (SLCE); however, engagement with this concept varies widely in practice and across disciplines. To enhance the potential of SLCE to fulfill its promise for societal impact, engineering education must understand how reciprocity is achieved, recognize barriers that inhibit its progress, and identify strategies for how it can be strengthened. Purpose: We performed this review to understand the ways reciprocity is articulated in the engineering SLCE literature. Drawing from these articulations, we examined the extent of engagement with reciprocity toward providing insights into the design and assessment of SLCE efforts for reciprocity. Scope/Method: We performed a systematic literature review on engineering SLCE at institutes of higher education. Following an established approach to identify and synthesize articles, we developed deductive codes by distilling three well-articulated orientations of reciprocity. We then analyzed the operationalization of reciprocity in the literature. Results: The literature demonstrated varying degrees of reciprocity. Minimally reciprocal efforts centered university stakeholders. In contrast, highly reciprocal partnerships explicitly addressed the nature of engagement with communities. Findings provide insights into the breadth of practice within reciprocity present in engineering SLCE. Further, analysis suggests that our codes and levels of reciprocity can function as a framework that supports the design and evaluation of reciprocity in SLCE efforts. Conclusions: Our review suggests that to enact more equitable SLCE, researchers and practitioners must intentionally conceptualize reciprocity, translate it into practice, and make visible the ways in which reciprocity is enacted within their SLCE efforts.

Open microfluidics is an emerging field of bio/medical applications that need direct energy/matter exchange between microfluids and environment. This paper presents the design, simulation, fabrication, and test of a microfluidic chip for a water-in-oil (WiO) two-phase flow in closed-open-closed microchannels. The chip, fabricated from PDMS using soft lithography, consists of a flow-focusing structure for WiO droplet generation and a long closed-open-closed channel for droplet flow. A negative pressure applied to the end of the channel is used as the driving force for WiO droplets to flow through the open channel. It is found that the negative pressure that is capable of driving a steady flow for a given flow rate, without overflow and air suction, falls into a pressure range instead of being an exact value. The mechanism for the pressure range is investigated theoretically and experimentally and is attributed to the surface tension. Yeast cells have been incorporated in the droplets, and the successful flow through the open channels verifies the function of the chips.