Samantha M. Marquez
Georgia Tech Research Institute
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Publication
Featured researches published by Samantha M. Marquez.
RSC Advances | 2017
Xiayun Huang; Yi-Hsin Yu; Oscar L. de Llergo; Samantha M. Marquez; Zhengdong Cheng
We report the fabrication of a polypyrrole-coated interfacial solar membrane using a versatile dip-coating method, which enables solar vapor generation efficiency of 72% for the purpose of desalination. This next-generation method of thermal desalination membrane uses solar thermal energy as a heat source to vaporize salt and brackish water. The polypyrrole thin film is tightly attached to individual non-conductive polypropylene fibers in a mesh. The dip-coating method can be applied to different types of membranes, regardless of the wetting property, conductivity, or surface curvature.
New Journal of Physics | 2015
Ya-Wen Chang; Alexandros Fragkopoulos; Samantha M. Marquez; Harold D. Kim; Thomas E. Angelini; Alberto Fernandez-Nieves
Bacteria in the natural environment exist as interface-associated colonies known as biofilms . Complex mechanisms are often involved in biofilm formation and development. Despite the understanding of the molecular mechanisms involved in biofilm formation, it remains unclear how physical effects in standing cultures influence biofilm development. The topology of the solid interface has been suggested as one of the physical cues influencing bacteria-surface interactions and biofilm development. Using the model organism Bacillus subtilis, we study the transformation of swimming bacteria in liquid culture into robust biofilms in a range of confinement geometries (planar, spherical and toroidal) and interfaces (air/water, silicone/water, and silicone elastomer/water). We find that B. subtilis form submerged biofilms at both solid and liquid interfaces in addition to air-water pellicles. When confined, bacteria grow on curved surfaces of both positive and negative Gaussian curvature. However, the confinement geometry does affect the resulting biofilm roughness and relative coverage. We also find that the biofilm location is governed by oxygen availability as well as by gravitational effects; these compete with each other in some situations. Overall, our results demonstrate that confinement geometry is an effective way to control oxygen availability and subsequently biofilm growth.
Biomicrofluidics | 2012
Ya-Wen Chang; Peng He; Samantha M. Marquez; Zhengdong Cheng
This paper reports the use of microfluidic approaches for the fabrication of yeastosomes (yeast-celloidosomes) based on self-assembly of yeast cells onto liquid-solid or liquid-gas interfaces. Precise control over fluidic flows in droplet- and bubble-forming microfluidic devices allows production of monodispersed, size-selected templates. The general strategy to organize and assemble living cells is to tune electrostatic attractions between the template (gel or gas core) and the cells via surface charging. Layer-by-Layer (LbL) polyelectrolyte deposition was employed to invert or enhance charges of solid surfaces. We demonstrated the ability to produce high-quality, monolayer-shelled yeastosome structures under proper conditions when sufficient electrostatic driving forces are present. The combination of microfluidic fabrication with cell self-assembly enables a versatile platform for designing synthetic hierarchy bio-structures.
Archive | 2010
Manuel Marquez; Samantha M. Marquez; Antonio Garcia
Archive | 2015
Samantha M. Marquez; Alberto Fernandez-Nieves; Thomas Ettor Angelini; Ya-Wen Chang
Archive | 2010
Manuel Marquez; Samantha M. Marquez; Antonio Garcia
Archive | 2010
Manuel Marquez; Samantha M. Marquez
Archive | 2010
Manuel Marquez; Samantha M. Marquez
Physical Review E | 2018
Ya-Wen Chang; Michael S. Dimitriyev; Anton Souslov; Svetoslav V. Nikolov; Samantha M. Marquez; Alexander Alexeev; Paul M. Goldbart; Alberto Fernandez-Nieves
Archive | 2016
Samantha M. Marquez; Thomas Ettor Angelini; Wallace Gregory Sawyer; Kyle Gene Rowe; Tapomoy Bhattacharjee; Alberto Fernandez-Nieves; Ya-Wen Chang