University of Florida Research Foundation Inc

Ut-battelle, Inc.

University of Notre Dame Du Lac

Saeed Moghaddam

Sajjad Bigham

Seyyed A Fazeli

Devesh Chugh

Toshikazu Nishida

Dazhi Yu

Mehdi Mortazavi

Edward J Maginn

David Bloomquist

Omar Abdelaziz

Mark E Orazem

Rui Kong

Yuelong Huang

Glen H Walters

Rasool Nasrisfahani

Mohammad Takmeel

Patrick Lomenzo

Aniruddh Shekhawat

Abhilash Paneri

Han Lai

David A Horner

Various examples are provided related to hydrogen plasma treatment of hafnium oxide. In one example, a method includes depositing a monolayer of a precursor on a first oxide monolayer; forming a second oxide monolayer by applying an oxygen (O) plasma to the monolayer of the precursor; and creating oxygen vacancies in the second oxide monolayer by applying a hydrogen (H) plasma to the second oxide monolayer. In another example, a device includes a hafnium oxide (HfO) based ferroelectric thin film on a first side of a substrate and an electrode layer disposed on the HfObased ferroelectric thin film opposite the substrate. The HfOfilm includes a plurality of oxide monolayers including at least one HfOmonolayer, each of the plurality of oxide monolayers having oxygen vacancies distributed throughout that oxide monolayer.

Ferroelectricity and thermal retention through in situ hydrogen plasma treatment of doped hafnium oxide

A liquid desiccant system including a high desorber, a low desorber, and an absorber that are in fluid communication with a working solution, where the high desorber provides rejected water vapor from the working fluid for condensation in a condenser of the low desorber that provides heat for rejection of additional water from the working solution in the low desorber effectively multiplying the heat provided for desorption. The low desorber provided the concentrated working solution to the absorber where water from ambient air is condensed into the concentrated working solution to provide a dilute working solution within a working solution conduit of the absorber that is thermally coupled to an internal cooler of the absorber. In some embodiments, the working solution can be an aqueous solution of at least one ionic liquid.

Liquid desiccant based dehumidification and cooling system

A high efficiency heat sink for the cooling of microelectronic devices involves a phase change from liquid fluid to fluid vapor with a vapor quality of 100%. The liquid fluid is provided to an active area that contains fins having micrometer dimension that support a membrane that is nanoporous. The membrane is effectively impermeable to liquid fluid but permeable to fluid vapor. The heat sink provides very high heat flux and coefficient of heat transfer at low mass flux over a broad range of surface superheat temperatures. The heat sink can be constructed of equi-spaced posts that separate liquid microchannels from vapor microchannels that are connected through capillary forced valves formed between adjacent equi-spaced posts.

Hierarchical hydrophilic/hydrophobic micro/nanostructures for pushing the limits of critical heat flux

An absorption refrigeration system (ARS), includes a sorbent-refrigerant pair that has an ionic liquid (IL) sorbent and a refrigerant that displays a lower critical lower critical solution temperature (LCST) at a temperature of 50 to 100&#xb0; C., wherein the separation of the sorbent from the refrigerant occurs upon heating the sorbent-refrigerant pair to a temperature above the LCST. This liquid-liquid phase separation requires significantly less energy to desorb the refrigerant from the sorbent than vapor-liquid phase separation in traditional ABSs.

Ionic liquid-based absorption cooling system with high coefficient of performance

An absorber for an absorption refrigeration system for a vertically mounted plate absorber has fins positioned over the plate to promote distribution of a fluid under flow as a nearly continuous thin film. The absorber has rows of fins that are evenly spaced with the fins occupying a portion of the active width of the plate with adjacent rows offset by the width of the plate. A combined evaporator-absorber module is constructed with the absorbing face of the absorber parallel with an evaporating surface of an evaporator where absorber solution and refrigerant fall as parallel falling sheets of liquid. The absorber is covered with a porous hydrophobic membrane to isolate the falling absorber solution from the falling liquid refrigerant.

Component and efficient plate and frame absorber

An absorber or desorber contains one or more micro-channels that have a 3-D structured heat-exchanging surface and a membrane on the microchannel situated distal to the 3-D structured heat-exchanging surface, where the membrane is permeable to a solvent of a solution employed in the absorber or desorber. The 3-D structured surface promotes mixing of hot and cold solution between the 3-D structured heat-exchanging surface and a vapor-exchanging surface proximal to the membrane. The mixing reduces the differences in concentration and temperature of the bulk solution and the solution at the vapor-exchanging surface to enhance the efficiency and rate of absorption or desorption of the solvent.

3D microstructures for rapid absorption/desorption in mechanically constrained liquid absorbents

Various methods and systems are provided for electrokinetic dewatering of suspensions such as, e.g., phosphatic clay. In one example, among others, a system for continuous dewatering includes a cake formation zone including a first anode and a first cathode each extending across a first portion of a separation chamber; a cake dewatering zone including a second anode and a second cathode; an inlet configured to supply a dilute feed suspension comprising solids suspended in water to the cake formation zone; and a conveying belt extending between the first anode and the first cathode and between the second anode and the second cathode. A first electric field between the first anode and the first cathode forms a cake on the conveying belt by consolidating the solids, and a second electric field between the second anode and the second cathode dewaters the cake on the conveying belt.

Continuous electrokinetic dewatering of phosphatic clay suspensions

Techniques for forming an electronic device having a ferroelectric film are described. The electronic device comprises a ferroelectric material having one or more crystalline structures. The one or more crystalline structures may comprise hafnium, oxygen, and one or more dopants. The one or more dopants are distributed in the ferroelectric material to form a first layer, a second layer, and a third layer. The second layer is positioned between the first layer and the third layer. Distribution of one or more dopants within the first layer, the second layer, and the third layer may promote a crystalline structure to have an orthorhombic phase.

Doped ferroelectric hafnium oxide film devices

An absorption cycle system, which permits water heating, dehumidifying, and/or evaporative cooling, includes a desorber, absorber, heat exchanger, and, optionally, an evaporator, is constructed to heat a process water that is plumbed through the absorber, heat exchanger, and condenser. In the absence or isolation of the evaporator, the system can dehumidify ambient air to the absorber. The water vapor released by evaporative cooling at the evaporator can be provided to the absorber in a controlled manner to simultaneously maintain a desired humidity while cooling the air ambient by the evaporator. The absorption cycle system can be housed within a single unit or can be compartmentalized.

Open absorption cycle for combined dehumidification, water heating, and evaporative cooling

An absorption based heater is constructed on a fluid barrier heat exchanging plate such that it requires little space in a structure. The absorption based heater has a desorber, heat exchanger, and absorber sequentially placed on the fluid barrier heat exchanging plate. The vapor exchange faces of the desorber and the absorber are covered by a vapor permeable membrane that is permeable to a refrigerant vapor but impermeable to an absorbent. A process fluid flows on the side of the fluid barrier heat exchanging plate opposite the vapor exchange face through the absorber and subsequently through the heat exchanger. The absorption based heater can include a second plate with a condenser situated parallel to the fluid barrier heat exchanging plate and opposing the desorber for condensation of the refrigerant for additional heating of the process fluid.

Architecture for Absorption Based Heaters

An exchanger for absorption or desorption of a refrigerant employs an ultra thin film (UTF) of a refrigerant solution constrained to a channel by a permeable membrane. The UTF has a thickness of about 250 &#x3bc;m or less. The permeable membrane can be a nanostructured membrane, such as a membrane of nanofibers. The exchangers can be employed in an absorption refrigeration system (ARS) that use waste heat or solar heaters permitting the ARS to be less than one tenth the volume and mass of a conventional ARS.

Growing community of inventors

Gainesville, FL, United States of America

Saeed Moghaddam