Russell Gorga

Dr. Russell E. Gorga is Professor of Textile Engineering, Alumni Distinguished Undergraduate Professor, the Director of Undergraduate Programs and Associate Department Head in the Textile Engineering, Chemistry and Science Department at NC State University. He is a member of the graduate faculty in the Fiber and Polymer Science program and has affiliate appointments in both Materials Science and Engineering and Biomedical Engineering. Dr. Gorga is currently involved in creating new processing modalities for nanofiber fabrication with applications ranging from tissue scaffolds (for regenerative medicine), antimicrobial fabrics, and filtration applications.

Dr. Gorga is the co-director of the Textile Engineering and Textile Technology Senior Design Capstone Program where the students learn how to apply the technical design cycle coupled with project management and teambuilding skills while working to solve open-ended industry relevant problems. In addition, he is also very active in problem and project based learning (PBL) initiatives and active learning pedagogies (including a flipped classroom approach).

In 2010, Dr. Gorga received the “Professional Progress in Engineering Award” from the College of Engineering at Iowa State University. Dr. Gorga received the NC State University Outstanding Teacher Award (2007 and 2016), the Alumni Association Outstanding Teaching Award (2016), the Alumni Distinguished Undergraduate Professor Award (2017), and was inducted into the Academy of Outstanding Teachers (2007).

Before coming to NC State, Dr. Gorga was a post-doctoral associate at MIT where he worked on improving the strength of brittle polymers using carbon nanotubes. Earlier, Dr. Gorga worked as a research engineer at Union Carbide Corporation (where he received the Special Recognition Award in 1998) from 1997 through 2000, where he focused on structure-property relationships of semi-crystalline polymers for high strength commodity applications.

Dr. Gorga is also extremely interested in classroom innovations, and continually seeks new ways to make the classroom a learning-focused environment.

In his spare time, he enjoys surfing, hiking, kayaking, photography, and music.

Research

Dr. Gorga is currently involved in creating new processing modalities for nanofiber fabrication with applications ranging from tissue scaffolds (for regenerative medicine), antimicrobial fabrics, and filtration applications. Specific interests lie in elucidating the processing, structure, property relationships of nanofibrous webs spun from novel methods.

Academic Degrees

• Post Doctoral Associate, Chemical Engineering, Massachusetts Institute of Technology, 2002
• Ph.D., Chemical Engineering, Iowa State University, 2002
• M.S., Chemical Engineering, Rutgers University, 1997
• B.S., Materials Engineering, Drexel University, 1994

Publications

Cellulose-lignin biodegradable and flexible UV protection film

Sadeghifar, H., Venditti, R., Jur, J., Gorga, R. E., & Pawlak, J. J. (2017), ACS Sustainable Chemistry & Engineering, 5(1), 625-631.

Enhanced crystallinity of polymer nanofibers without loss of nanofibrous morphology via heterogeneous photothermal annealing

Viswanath, V., Maity, S., Bochinski, J. R., Clarke, L. I., & Gorga, R. E. (2016), Macromolecules, 49(24), 9484-9492.

Effect of constrained annealing on the mechanical properties of electrospun poly(ethylene oxide) webs containing multiwalled carbon nanotubes

Bao, J. X., Clarke, L. I., & Gorga, R. E. (2016), Journal of Polymer Science. Part B, Polymer Physics, 54(8), 787-796.

Blending with non-responsive polymers to incorporate nanoparticles into shape-memory materials and enable photothermal heating: The effects of heterogeneous temperature distribution

Abbott, D. B., Maity, S., Burkey, M. T., Gorga, R. E., Bochinski, J. R., & Clarke, L. I. (2014), Macromolecular Chemistry and Physics, 215(23), 2345-2356.

Control of the electric field-polymer solution interaction by utilizing ultra-conductive fluids

Thoppey, N. M., Gorga, R. E., Clarke, L. I., & Bochinski, J. R. (2014), Polymer, 55(24), 6390-6398.

A one-pot biosynthesis of reduced graphene oxide (RGO)/bacterial cellulose (BC) nanocomposites

Nandgaonkar, A. G., Wang, Q. Q., Fu, K., Krause, W. E., Wei, Q. F., Gorga, R., & Lucia, L. A. (2014), Green Chemistry, 16(6), 3195-3201.

Maximizing spontaneous jet density and nanofiber quality in unconfined electrospinning: The role of interjet interactions

Roman, M. P., Thoppey, N. M., Gorga, R. E., Bochinski, J. R., & Clarke, L. I. (2013), Macromolecules, 46(18), 7352-7362.

Thermal annealing of polymer nanocomposites via photothermal heating: Effects on crystallinity and spherulite morphology

Viswanath, V., Maity, S., Bochinski, J. R., Clarke, L. I., & Gorga, R. E. (2013), Macromolecules, 46(21), 8596-8607.

Literature review on superhydrophobic self?cleaning surfaces produced by electrospinning

Iurii Sas, Russell E Gorga, Jeff A Joines, Kristin A Thoney. (2012), Journal of Polymer Science. Part B, Polymer Physics, 50(12), 824-845.

Effect of solution parameters on spontaneous jet formation and throughput in edge electrospinning from a fluid-filled bowl

Thoppey, N. M., Gorga, R. E., Bochinski, J. R., & Clarke, L. I. (2012), Macromolecules, 45(16), 6527-6537.

View All Publications

Grants

Unconfined melt electrospinning with control of conductivity: a scale-up and green processing approach to fabricate nanofibers from thermoplastics

National Science Foundation (NSF)(8/15/16 - 7/31/19)

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Unconfined melt electrospinning with control of conductivity: a scale-up and green processing approach to fabricate nanofibers from thermoplastics

Sponsor: National Science Foundation (NSF)

Start Date: 8/15/16

End Date: 7/31/19

Abstract

This proposal seeks to understand the fundamental science underlying electrospinning from an unconfined sheet of molten polymer. This method is "green" (solvent-free and compatible with recyclable plastics), should result in meso-fibers having dramatically improved mechanical properties, and will allow manipulation of the electrospinning process to create smaller fiber diameters than typically achievable under traditional needle-based approaches. The work will involve unconfined melt electrospinning of the three common commercial thermoplastics: polyethylene, polypropylene and polyethylene terephthalate. The research focuses on the roles of flow rate and melt conductivity, which have not been previously explored due to severe experimental challenges. Conductivity will be altered by adding conductive compounds (Aim 1) or by generating a localized electrical discharge within or near the fluid (Aim 2).

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Biometrics Analysis for Animals

US Army - Army Research Office(1/01/17 - 8/21/17)

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Biometrics Analysis for Animals

Sponsor: US Army - Army Research Office

Start Date: 1/01/17

End Date: 8/21/17

Abstract

A working canine must undergo physiological stress, which should be monitored to keep track of the canine’s health and safety. Our team will develop a textile enclosed electronic device for canines that is capable of detecting and quantifying stress levels. The device will be comprised of readily available electronic components and must include a comfortable textile that can be mounted on an animal, without a further increase of the canine’s stress level. This project will work in conjunction with the Senior Design Capstone course in Textile Engineering & Textile Technology during the 2015-2016 academic year. A final product and report will be delivered to the sponsoring agency by June 15th, 2016. The team will work in conjunction with the Army Research Office and K2 Solutions.

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Triggering chemical degradation at end-of-life: Using light + environmentally neutral nanoparticles for internal energy deposition in plastics

National Science Foundation (NSF)(5/01/15 - 4/30/19)

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Triggering chemical degradation at end-of-life: Using light + environmentally neutral nanoparticles for internal energy deposition in plastics

Sponsor: National Science Foundation (NSF)

Start Date: 5/01/15

End Date: 4/30/19

Abstract

The ability to controllably trigger breaking of chemical bonds is a crucial step in reducing environment waste and pollution due to plastics. Discarded plastic material often detrimentally resides within the environment for many years, leading to myriad problems: sickening or killing a wide range of life forms from microbes to large animals, effecting both marine and terrestrial mammals and birds, clogging drainage and water processing systems, contaminating landfills with deleterious chemicals, or resulting in sterile soil and accumulation of toxins within specific ecosystems. A key issue underlying the ability intentionally initiate degradation of polymeric materials is implementing an approach to start breaking of chemical bonds - enabling a substance that has robust material properties during use, which can then be re-worked or deteriorated upon command. Proving this proposal’s hypothesis that degradation (i.e., bond-breaking) could be controllably triggered and/or driven via photothermal heating would result in a powerful tool that addresses this complex problem on multiple-levels: for instance, providing an opportunity for one-time treatment to begin a long degradation process (a consumer shines a green light on a plastic object upon discarding), generating visible light sensitivity that would enhance deterioration using sunlight, or resulting in thermally triggered re-workable adhesives/epoxies. The success of even a single proposed modality would have a significant effect in mediating plastic environmental pollution. This proposal tests the hypothesis that the strongly inhomogeneous temperature gradients created in the interior of polymers upon photothermal heating of embedded nanoparticles can be utilized to efficiently trigger thermally-induced bond breaking in polymeric materials via exposure to near infrared or visible light. Such heat generated within the material can impel a degrading or cross-link-breaking chemical reaction either by instigating a self-sustaining process, or when applied over a longer time by continuously enhancing such reaction rates. Thus, the materials developed due to this scientific knowledge would have an additional functionality -- the ability to degrade upon command. Previous work has shown that the inhomogeneous temperature profile created within polymers undergoing photothermal heating, which creates intense local heat at isolated nanoparticle locations embedded within the sample, results in a very different material response (for instance, far more rapid crystallization rates) than when utilizing conventional heating methods, where the entire sample is slowly, uniformly warmed from the outside to the inside. This internal placement of nanoscale heaters leads to triggering of chemical reaction fronts that spread outwards and natural segregating of the material into smaller pieces. Rather than degrading from the surface inwards, which always retains an intact inner core of material, here the material is homogeneously fragmented from within and the chemistry reactions occur from the inside outward.

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Johnson Controls Inc. Fall 2013 & Spring 2014 Project

Johnson Controls, Inc.(9/01/13 - 8/31/14)

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Johnson Controls Inc. Fall 2013 & Spring 2014 Project

Sponsor: Johnson Controls, Inc.

Start Date: 9/01/13

End Date: 8/31/14

Abstract

The objective of this research is looking at the existing materials which can be used as solar textiles and also developing the new materials which can be used in automotive seating and can harvest the solar energy and store it. This will include a thorough research of current technologies and existing materials and the development of a prototype that can capture the solar energy and store the energy.

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Task 11. Research Design Project for Military Working Dog Realistic Bite Suit

US Army - Army Research Office(9/27/13 - 8/31/16)

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Task 11. Research Design Project for Military Working Dog Realistic Bite Suit

Sponsor: US Army - Army Research Office

Start Date: 9/27/13

End Date: 8/31/16

Abstract

The purpose of this project is to provide academic subject matter expertise and direct research and technical support for United States Army Special Operations Command ( USASOC). The intent of this project is to make technical knowledge, data and forward-looking solutions available to USASOC. The scope of the project may cover a wide range of topic areas to include, but not be limited to: materials science, chemistry, life sciences, human performance, computing science, network science, mechanical sciences, electronics and engineering across multiple core disciplines. In this project, senior design teams will develop a bite suit that mimics the tactile sensation, puncture resistance, smell, and taste of skin for military working dog-combat canine bite training. A realistic bite suit with artificial skin and embedded sensors that will enable measurement of bite pressure and release will be developed. The team will fabricate a proof-of-concept prototype at the end of the design course for delivery to USASOC.

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Lignin as a Material Platform for High Value-Added Macromolecules-Hybrid Fibers

US Dept. of Agriculture (USDA) - National Institute of Food and Agriculture(6/01/13 - 8/31/15)

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Lignin as a Material Platform for High Value-Added Macromolecules-Hybrid Fibers

Sponsor: US Dept. of Agriculture (USDA) - National Institute of Food and Agriculture

Start Date: 6/01/13

End Date: 8/31/15

Abstract

Currently, there is limited process chemistry for converting lignin to profitable advanced materials. The results of this proposal will establish the reaction parameters and surface chemistry modifications necessary for shifting the paradigm of low-profit lignin products to the utilization of lignin in high value, energy-related applications. A rich interplay between the forest biomaterials and silicon chemistry communities will be established through a fundamentally different surface modification of lignin with silicon-containing precursors. The results are expected to impart thermal stability and surface-activity enhancement to lignin macromolecules. If successful, this work will provide biorefineries in the Southeastern Sun Grant region with processing options for deriving increased value from lignocellulosic biomass. More broadly, providing value-added applications for bio-derived materials can reduce our dependence on fossil fuels, increase rural income and help to solve environmental issues caused by the use of non-renewable resources. This proposal seeks to address the USDA-NIFA and the SGP-SER priority areas of improving preprocessing for high quality feedstock from biomass from switchgrass (primary) and pine. Specific to this proposal is the development of high value-added ceramic-carbon hybrid fiber. While lignin is the second most abundant polymer found in nature, its complex chemical structure and poor thermal stability limit its application-use to low-profit fillers and adhesives. Our central hypothesis is that lignin?s limitations in higher cost margin materials can be reduced with surface modification by thermally stable silicon-containing precursors which impart unique surface properties.

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Utilizing the Photothermal Effect of Metal Nanoparticles for Processing of Polymers

National Science Foundation (NSF)(5/01/11 - 4/30/16)

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Utilizing the Photothermal Effect of Metal Nanoparticles for Processing of Polymers

Sponsor: National Science Foundation (NSF)

Start Date: 5/01/11

End Date: 4/30/16

Abstract

We will investigate the use of the photothermal effect of metal nanoparticles as a tool for materials processing and actuation. This effect converts light energy into heat via coupling with the nanoparticle surface plasmon resonance; thus, metal nanoparticles can act as externally-driven, nano-sized thermal sources from within a material, providing efficient, selective, and remotely-controlled localized heating when the material (doped with a small fraction of nanoparticles) is irradiated with relatively weak light. Our previous research has recently demonstrated that using relatively weak irradiation intensity, nanofibrous mats with a low concentration of metal nanoparticles can be facilely heated to temperatures sufficient to melt the polymer matrix; this effect can also be usefully employed in bulk materials. Such efficient and controllable localized heating represents a powerful new tool for in situ processing and actuation. Instead of requiring development of specific light-sensitive polymeric materials, any material that can be thermally processed, activated, or actuated could now be controlled in-situ by a light field. The spatial and wavelength specificity of the heating offers several implicit advantages: 1) Heat is generated from within a medium, as opposed to conventional methods where the surface of the material is the first to warm; thus, for instance, the interior of a structure could be processed to a higher temperature than the surface. 2) Heat is generated only in the immediate region of the nanoparticles; thus by placing nanoparticles in particular regions of the sample, selective in situ processing can be accomplished. 3) The heat-generating illumination source can be optimally tuned for the given system; as the nanoparticle absorption wavelength is characteristic of the particle type, one can select a particle resonant with a preferred wavelength in order to obtain maximum light penetration into a particular material. 4) Different nanoparticle heater types (resonant at different light frequencies) can be incorporated into different regions of the same sample allowing heating of different regions at will. We will address three specific aims: 1) To develop techniques to measure temperature at the nanometer-size scale in order to experimentally determine the maximum temperature and the temperature gradient within the medium. Towards this activity we have utilized distinct, temperature-dependent changes in the emission spectrum of fluorophores such that they act as remote-readout nanoscale thermometers. 2) To utilize metal nanoparticles to actuate shape-memory polymers and explore multistage shape memory schemes. 3) To develop hybrid nanofiber materials (core-sheath structures with thermoset-precursor cores) that are flexible when fabricated and can be positioned, deformed, or templated on a three-dimensional structure and subsequently "stiffened" from within, dramatically increasing their modulus, by photothermal curing of the thermoset core to form a rigid assembly.

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A Mechanistic Understanding of the Process-Property Relationships in an Alternative Electrospinning Process

National Science Foundation (NSF)(8/01/08 - 7/31/13)

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A Mechanistic Understanding of the Process-Property Relationships in an Alternative Electrospinning Process

Sponsor: National Science Foundation (NSF)

Start Date: 8/01/08

End Date: 7/31/13

Abstract

This fundamental research will enable the production of nanofibrous substrates for use in a wide-range of applications, such as filtration, sensors, fuel cells, and tissue engineering. Our approach is to make a paradigm shift from fiber growth from a droplet suspended from a needle to fiber growth from a large concentration of droplets on a surface. Such a surface can easily be patterned to provide literally thousands or tens of thousands (25 million sites for a 10 um square "patch" of hydrophobic/hydrophillic material on a 0.1 m square plate) of possible spinning sites. The ability to efficiently and continuously supply these "spinning sites" with solution, to determine where spinning originates, and to control droplet and fiber size are primary objectives of this research. We propose that much smaller diameter fibers (~ 50 nm or less) can be obtained by controlled design of the charged plate (where key parameters include interfacial tension and surface architecture). Morphology, mechanical, and electrical properties will be studied to develop a mechanistic understanding of the processing-property relationships as the primary fundamental outcome.

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Feasibility Investigation For Fabric-Based Ionizing Radiation Protection Garments

Defense Advanced Research Projects Agency (DARPA)(9/01/06 - 10/31/07)

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Feasibility Investigation For Fabric-Based Ionizing Radiation Protection Garments

Sponsor: Defense Advanced Research Projects Agency (DARPA)

Start Date: 9/01/06

End Date: 10/31/07

Abstract

The goal of this proposal is to create films and fibers loaded with high percentages of radiopaque and/or high atomic number fillers that will attenuate radiation. Data will be generated on radiation attenuation of films and fibers to demonstrate the performance of such systems.

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Smart Nanocomposites Design: From Molecular Structure to Bulk Properties

NCSU Faculty Research & Professional Development Fund(7/01/06 - 6/30/07)

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Smart Nanocomposites Design: From Molecular Structure to Bulk Properties

Sponsor: NCSU Faculty Research & Professional Development Fund

Start Date: 7/01/06

End Date: 6/30/07

Abstract

The proposed project will address the interplay between strength and toughness as a result of how the nanotube/polymer interface is engineered. For example, the interface between polymer and nanoparticle controls the composite?s strength and toughness. High interfacial strength is desirable to maximize the composite?s strength, while slip between the nanoparticle and matrix (low interfacial strength) is required for maximum toughness. For well-dispersed, oriented nanocomposites, we will quantify: ? The strength of the nanocomposite as a function of interfacial strength; ? The toughness of the nanocomposite as a function of interfacial strength; and ? The optimization of both strength and toughness for the nanocomposite. In this study, we will fabricate carbon nanotube/nylon fibers and films to study the molecular motion, nano- and macroscopic mechanical, electrical, rheological, and processing properties of the composite system of interest. We will combine many analytical techniques to develop a mechanistic understanding of the factors that influence strength and toughness at the nanotube/nylon interface.

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Organizations

• Academy of Outstanding Teachers, NC State University, inducted 2007
• Alpha Sigma Mu, Honorary Materials Engineering Society
• American Chemical Society
• American Institute of Chemical Engineers
• American Physical Society
• The Fiber Society
• Materials Research Society
• Sigma Xi, Honorary Research Society, MIT Chapter
• Tau Beta Pi, Honorary Engineering Society

Teaching

• TE 463 - Polymer Engineering , Fall
• TE/TT 401 - TE Senior Design I , Fall
• TE/TT 402 - TE Senior Design II , Spring