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Michael Dickey

Camille and Henry Dreyfus Professor

he/him/his

Engineering Building I (EB1) 2088G

Bio

The Dickey group is studying new ways to pattern, actuate, and control soft materials (gels, polymers, liquid metals). A common theme of our projects is the importance of thin films, interfacial phenomena, and microfabrication. One interesting application of our work is for “blue energy”; that is, harvesting energy from the motion of waves and water for clean energy sources.

SHORT DESCRIPTION OF INTERESTS:

Harvesting energy from the environment.

https://www.cbe.ncsu.edu/dickeygroup/

Publications

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Grants

Date: 01/01/21 - 12/31/23
Amount: $364,564.00
Funding Agencies: National Science Foundation (NSF)

The goal of this proposal is to collaborate with ASU to study new types of liquid metal pastes.

Date: 01/01/21 - 12/31/22
Amount: $249,950.00
Funding Agencies: National Science Foundation (NSF)

This projects focuses on efforts towards commercialization of a flexible thermoelectric module manufacturing process developed with prior funding from National Science Foundation through Advanced Self-Powered Sensors and Integrated Technologies (ASSIST) Engineering Research Center. These modules can harvest body heat and the generated electricity can be used to power wearable electronics providing the ability to perform long-term continuous sensing. A process compatible with roll-to-roll manufacturing is described. The proposal addresses potential failure mechanisms that may have an impact on the long-term reliability of the modules.

Date: 11/01/19 - 10/31/22
Amount: $150,000.00
Funding Agencies: US Dept. of Defense (DOD)

Thermal control in engineered systems is typically accomplished using fixed heat flow paths and by varying the amount of heat (energy flow) provided in order to control temperature at specified point(s) within the system. The goal of this work is to develop a practical device that allows heat flow paths to be adjusted dynamically via more advanced thermal control logic and tuned thermal interfaces.

Date: 09/01/12 - 8/31/22
Amount: $496,786.00
Funding Agencies: NCSU Advanced Self Powered Systems of Sensors and Technologies (ASSIST) Center

The goal of this project is to develop a class of sensors based entirely on soft materials including hydrogels, elastomers, and liquid metals. The appeal of this approach to sensing is that (1) the hydrogels are biocompatible and in principles can be interfaced with the skin, and (2) the materials are all soft and therefore can conform to the skin in a comfortable manner. The premise of the sensing arises from doping the gels with responsive molecules that can induce a detectable signal that can be integrated with other components being researched within the ASSIST program.

Date: 09/01/15 - 8/31/22
Amount: $323,013.00
Funding Agencies: NCSU Advanced Self Powered Systems of Sensors and Technologies (ASSIST) Center

We propose to study and enable ‘reverse electrowetting’ as a means of energy harvesting. The appeal of the proposed technique is that it is a platform built from soft materials (elastomers, fluids) and converts mechanical energy directly into electrical energy using a small footprint. The project is based on exciting preliminary results obtained by a summer student in our laboratory. Classic ‘electrowetting on dielectric’ utilizes electrical energy (voltage, current) to induce a droplet to wet a surface (mechanical work). It typically consists of a drop of liquid (e.g., water, ionic liquid, etc.) resting on a thin, non-wetting, electrically insulating substrate supported by an underlying electrode (Figure 1, left). In the absence of potential, the droplet assumes a round, non-wetting shape due to surface tension. The application of a potential between the drop and the underlying electrode causes the droplet to spread across the substrate to maximize capacitance. The final shape of the drop represents a balance of the forces of surface tension and capacitance.

Date: 08/15/21 - 8/14/22
Amount: $95,000.00
Funding Agencies: Air Force Research Laboratory (AFRL)

This proposal focuses on a way to self-power devices by converting mechanical energy into electricity. The approach will use all soft materials and can convert electricity via all modes of deformation.

Date: 08/01/21 - 7/31/22
Amount: $184,625.00
Funding Agencies: National Institutes of Health (NIH)

Lower limb amputees rely on prosthetic sockets as the interface with their prosthetic legs. The prosthetic sockets only work well if they fit residual limbs of amputees perfectly. Unfitted sockets cause various health issues for lower limb amputees and could significantly limit amputees’ functionality. Currently, prosthetists lack the capability to diagnose socket fit during the socket fitting procedure, which limits their capability to customize the sockets for better fit. The proposed Enable system will be used as a diagnosis tool for prosthetists. Based on a novel material, which changes color based on loaded pressure, this Enable system will permit prosthetists to evaluate the socket fit by observing the pressure distribution on the residual limb directly. During the proposed project, we will develop the smart liner system and test it through both bench tests and human subject tests. We will also validate that prosthetists will be able to use the smart liner to make appropriate socket fit diagnosis through simulated clinical cases.

Date: 01/01/21 - 6/30/22
Amount: $80,000.00
Funding Agencies: NCSU Center for Dielectrics and Piezoelectrics (CDP)

The goal of this new project is to study and explore a new material whose dielectric constant decreases with deformation. Consequently, it can change geometry due to mechanical deformation without changing capacitance. Future electronic devices are envisioned to be mechanically compliant (flexible, soft, stretchable) to facilitate human-machine interactions and new types of wearable devices. Such devices can change geometry and thus capacitance in response to deformation. Although these changes can be useful for sensing, in other applications changes in capacitance are undesirable. To offset such changes, we propose a new dielectric material that can change dielectric properties in response to deformation.

Date: 09/01/18 - 5/01/22
Amount: $187,103.00
Funding Agencies: NCSU Nonwovens Institute

The proposed work herein seeks to elucidate the fundamental process-property-structure relationship of thermoplastic elastomers (TPEs). These types of studies have been done previously for thermoplastics, but TPEs are relatively new to the ‘world’ of fibers and fabrics. We will create fibers while varying process parameters such as the mass flow rate, temperature, spin speed, and quench conditions. The first year will survey three TPEs and the subsequent years will study in depth the most promising TPE. This strategy will allow us to focus on the effects of melt processing on the morphology of the block copolymer TPEs (most, but not all TPEs are block copolymers). Block copolymer morphology has been studied extensively under quiescent conditions, but not under the high shear, dynamic conditions in nonwoven processing. We will vary the resin parameters and measure the mechanical properties and morphology of the fibers as a function of these parameters and identify predictive tools to understand the process-property-structure relations. We will also explore the use of additives such as polyolefins to alter mechanical properties and tackiness. As the project advances, we will use the fundamental learning of individual fibers to enable the formation of spunbond and meltblown nonwovens. Time permitting, the barrier properties of these nonwovens will be characterized. We will work closely with member companies and the NWI to create and study these fibers. The outcome of this project will be a fundamental understanding of the process-property-structure relationships of these emerging materials.

Date: 03/14/19 - 3/31/22
Amount: $158,499.00
Funding Agencies: US Army - Army Research Laboratory

The goal of this project is to utilize and study self-folding to create functional electronic and mechanical structures.


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