asteroza + oxide   111

OSA | Study of W/HfO2 grating selective thermal emitters for thermophotovoltaic applications
Interesting, tungsten with a hafnium oxide grating over it has highly selective IR emittance, making it well matched for gallium based TPV cells
tungsten  emitter  hafnium  oxide  transverse  magnetic  polarization  surface  plasmon  shaping  IR  TPV  cell  matching  power  generator  materials  science  research  technology 
august 2019 by asteroza
Graphene Spun into Meter-Long Fibers - Scientific American
So graphene oxide liquid crystals were dried out to make meters long (but imperfect) fibers which are weaker than normal carbon fiber, but have great conductivity. Has this been commercialized into low weight electrical wire yet?
graphene  oxide  liquid  crystal  fiber  manufacturing  materials  science  research  technology 
april 2019 by asteroza
Non‐Volatile Silicon Photonics Using Nanoscale Flash Memory Technology - Grajower - - Laser & Photonics Reviews - Wiley Online Library
MONOS allows using conventional NAND flash CMOS manufacturing techniques to yield potentially terahertz speed circuits. Heat is probably still a problem, but this may make chip internal optics easier, as well the mentioned filter/switch/modulator/resonater/laser optics applications
metal  oxide  nitride  silicon  semiconductor  terahertz  IC  circuit  research  technology  manufacturing  optics  optonics  photonics  photonic  materials  science 
march 2018 by asteroza
Pure lead cooled (not eutectic) uranium oxide reactor design, using new aluminum coating for the coolant systems
Sweden  uranium  oxide  lead  cooled  nuclear  reactor  power  generator  materials  science  research  technology  aluminum  surface  coating  metal  corrosion  resistance 
november 2017 by asteroza
Harvesting Hydrogen Gas from Air Pollutants with an Unbiased Gas Phase Photoelec...
Uses light, air, and organic pollutants to create hydrogen gas and clean the air apparently. Works better without oxygen, but does work with ambient air and light only.
photoelectrochemical  cell  titanium  oxide  photoanode  hydrogen  gas  production  light  solar  green  energy  air  pollution  synfuel  Delicious 
may 2017 by asteroza
Water harvesting from air with metal-organic frameworks powered by natural sunli...
Hrm, seems like as long as you have sun and a front end filter for the air to keep the MOF from gunking up, this could work indefinitely...
zirconium  MOF  metal  oxide  framework  air  water  humidity  capture  materials  science  research  technology  heat  solar  harvester  Delicious 
april 2017 by asteroza
Reversible aqueous zinc/manganese oxide energy storage from conversion reactions : Nature Energy
Battery chemical equilibrium was apparently not as well understood as previous thought, simple fix improves rechargability.
reversible  zinc  manganese  oxide  battery  materials  science  research  technology  Delicious 
may 2016 by asteroza
High Elastic Moduli of a 54Al2O3-46Ta2O5 Glass Fabricated via Containerless Processing : Scientific Reports
New high strength glass, but it requires a high temperature air levitation furnace setup (which is expensive to operate), and uses tantalum, which is stupid expensive. The glass by weight of the component ingredients alone would cost more than silver by weight.
tantalum  aluminum  silica  oxide  glass  materials  science  research  technology  Delicious 
november 2015 by asteroza
High-rate aluminium yolk-shell nanoparticle anode for Li-ion battery with long cycle life and ultrahigh capacity : Nature Communications : Nature Publishing Group
Interesting trick of using an alumina oxide nanoparticle, converting the outer layer to titanium oxide, and thus creating a nanoparticle anode with a squishy center that can handle expansion stress from battery cycling.
nanocomposite  nanoparticle  titanium  oxide  shell  aluminum  yolk  materials  science  research  technology  nanotechnology  high  performance  battery  anode  Delicious 
august 2015 by asteroza
Thermoelectric Power Generation from Lanthanum Strontium Titanium Oxide at Room Temperature through the Addition of Graphene - ACS Applied Materials & Interfaces (ACS Publications)
Interesting, graphene doping the sintering powder reduced thermal conductivity but increased electrical conductivity. 2 watts/m2 at room temperature is nothing to sneeze at neither.
lanthanum  strontium  titanium  oxide  titanate  graphene  thermoelectric  power  generator  materials  science  research  technology  composite  nanocomposite  room  temperature  Delicious 
august 2015 by asteroza
Synthesized material enables plasmonic devices in mid-infrared range
New material found that does surface plasmon resonance in the mid-IR range, which previously was unavailable (usually metals in UV or semiconductors in far-IR, but nothing in between)
cadmiun  oxide  dysprosium  doping  mid  IR  surface  plasmon  resonance  oscillator  materials  science  research  technology  Delicious 
february 2015 by asteroza
Apparently they have a good high temperature steam electrolysis SOEC that can produce hydrogen at decent efficiencies, for feeding into a RWGS conversion reactor syngas production rig, to eventually produce synthetic methane (combining syngas from the reactor with additional H2 from the SOEC), or eventually via FT, synthetic liquid fuels. They don't seem to be doing a coelectrolysis SOEC to crack steam and CO2 simultaneously in the same cell stack though.
SOEC  solid  oxide  electrolysis  cell  high  temperature  water  H2O  steam  CO2  syngas  production  synfuel  synthetic  fuel  methane  CH4  liquid  GTL  hydrogen  Delicious 
november 2014 by asteroza
Super-stretchable Graphene Oxide Macroscopic Fibers with Outstanding Knotability Fabricated by Dry Film Scrolling - ACS Nano (ACS Publications)
Interesting use of graphene as yarn, then fiddling with it to get conductivity properties similar to copper at reduced weight, suitable for electrical cables.
graphene  yarn  fiber  materials  science  research  technology  nanotechnology  oxide  Delicious 
june 2014 by asteroza
Amorphous TiO2 coatings stabilize Si, GaAs, and GaP photoanodes for efficient water oxidation
Using electron leaky titanium dioxides as a semiconductor coating that can pass electrons, a possible oxidizing side water photocracker to produce solar fuels.
materials  science  research  technology  artificial  photosynthesis  water  cracking  electrolysis  oxidation  Ti2  leaky  electron  photoanode  nickel  oxide  photocatalyst  solar  fuel  syngas  hydrogen  production  amorphous  Delicious 
june 2014 by asteroza
Motorbike Generates Electricity Using Its Exhaust Gas -- Tech-On!
Bizarre hybrid device, that uses unburnt hydrocarbons in scooter exhaust gas to heat/run a SOFC fuelcell, which also has thermoelectric elements wrapped around the SOFC tubes to capture waste heat as well. Though my first question would be why use a crappy two/four stroke scooter engine in the first place? Why not a series hybrid powerplant, with a microturbine generator with fuelcell combustor? Though I suppose as an aftermarket mod, as long as it doesn't raise exhaust gas pressure losses too much, it might be an easy conversion...
thermoelectric  waste  conversion  scavenging  heat  fuelcell  SOFC  gas  solid  japan  oxide  power  generator  exhaust  hybrid  scooter  Delicious 
september 2013 by asteroza
Efficient Generation of H2 by Splitting Water with an Isothermal Redox Cycle
Interesting work showing no temperature swing, only the presence of steam, is the determinant in a redox reaction supporting water/steam cracking for hydrogen production at 1350C which is both lower than expected and avoids thermal cycling the metal oxide catalyst.
water  reaction  cycle  hercynite  isothermal  oxidation  solar  splitting  production  gas  redox  oxide  metal  hydrogen  cracking  reduction  steam  Delicious 
august 2013 by asteroza
Substrateless graphene/graphene oxide provider.
technology  oxide  materials  graphene  substrateless  manufacturer  research  nanotechnology  science  Delicious 
march 2013 by asteroza
New Coal Technology Harnesses Energy Without Burning, Nears Pilot-Scale Development
Interesting chemical loop method to bypass direct combustion of coal or syngas. Used sealed process to strip iron oxide of oxygen with coal or syngas carbon to produce CO2 and reduced iron oxide, along with any coal dregs. The reduced iron oxide is brought outside of the chemical reactor and exposed to air, which causes it to heat up exothermically as it reacquires oxygen, the heat of which can run a conventional boiler for a steam turbine power generator. Makes CO2 capture much easier, and allows isolation of slag materials for separation/vitrification, rather than sending it up as flue gases. Wonder if this could be paired with the chemical looping desalination processes proposed for high temperature nuclear reactors?
direct  CO2  looping  research  SCL  iron  syngas  CDCL  oxide  chemistry  coal  carbon  chemical  capture  power  CCS  Delicious 
february 2013 by asteroza
BNL Newsroom | Breakthrough Iron-based Superconductors Set New Performance Records
New high current/high magnetic field/high temperature superconductor that is iron based that beats the pants off of existing iron and cuperate superconductors. Demonstrated 1MA/cm2 critical current, 200KA/cm2 at 30T at 43K (not quite LN2 temps but close), and they think they can up the temperature by further tweaking the layering.
HTS  high  temperature  superconductor  iron  layered  composite  chalcogenide  thin  film  selenium  tellurium  pulsed  laser  deposition  cerium  oxide  materials  science  research  technology  Delicious 
january 2013 by asteroza
A regenerable oxide-based H2S adsorbent with nanofibrous morphology : Nature Nanotechnology : Nature Publishing Group
Possible new absorbent that might allow sulfur removal from natural gas or coal/biomass derived syngas without a cooling/liquid step (which normally complicates the process and introduces energy inefficiencies). This would make coal or biomass based syngas much more appealing, especially for advanced syngas combustion cycles that allow for easier carbon capture.
removal  sulphur  sulfer  biogas  syngas  nanotechnology  technology  research  science  materials  fiber  nanostructure  area  surface  reactivity  high  filtering  cleaning  processing  gas  sorbent  mat  nanofiber  oxide  titanium  zinc  adsorbent  H2S  sulfide  hydrogen  Delicious 
december 2012 by asteroza
Caltech Chemical Engineers Devise New Way to Split Water - Caltech Media Relations
850C 4 step thermochemical complete water splitting for hydrogen gas production, which puts it in the realm of operation with high temperature nuclear reactors.
thermochemical  water  splitting  manganese  oxide  sodium  carbonate  hydrogen  gas  production  chemistry  research  development  850C  Delicious 
august 2012 by asteroza
7. Experimental Proof of Concept for an Electrochemical Plasma Thruster nstp-pathfinder-project-list.pdf (application/pdf Object)
Interesting self sustaining plasma thruster that in principle generates the power needed for plasma acceleration without a powerful external power source. I guess you use a wirefeed to feed in the aluminum wire/rod at the thruster core? Consumes oxygen gas, aluminum wire, and helium buffer gas (how much?)
electrochemical  plasma  thruster  aluminum  oxide  oxygen  space  propulsion  research  technology  Delicious 
july 2012 by asteroza
Lilliputian Systems
Silicon wafer based SOFC, claiming 40% direct chemical to electrical efficiency. Apparently Brookstone will be carrying the SOFC as a portable charger pack for small electronics like cellphones. Uses butane apparently, so is aircraft approved, and relatively easy to get replacement fuel (conventional lighter butane ought to work). Wonder how it operates on natural gas, which isn't pure methane...
silicon  wafer  SOFC  solid  oxide  fuelcell  thin  film  surface  coating  materials  science  research  technology  compact  small  form  factor  power  generator  green  energy  butane  Delicious 
may 2012 by asteroza
Doctoral student's novel solar reactor may enable clean fuel derived from sunlight
Interesting looping hydrogen production from water via solar thermal zinc oxide reduction and production.
reactor  manufacturing  energy  green  technology  research  science  materials  production  hydrogen  thermal  solar  oxide  zinc  Delicious 
april 2012 by asteroza
Leaky graphene oxide lets water pour through
Whoa, this stops helium leakage?!? Can we say rocket tank liners anyone? Especially around welds. Also has applications for filtering water out of stuff, such as desalination reverse osmosis membranes.
graphene  oxide  membrane  materials  science  research  technology  nanotechnology  functionalized  separation  filter  helium  helium  leakage  barrier  Delicious 
january 2012 by asteroza
A Perovskite Oxide Optimized for Oxygen Evolution Catalysis from Molecular Orbital Principles
So getting oxygen out of water by electrolysis has traditionally been the limiting factor in performance. This new catalyst is apparently an order of magnitude better than the previous catalyst, but suffers from the same limitation, namely requiring an alkaline solution media to perform at its best. So perhaps not quite ready for primetime. However, apparently there are some integration possibilities with Dr. Nocera's artificial leaf project, which uses similar behavior catalysts.
perovskite  oxide  oxygen  evolution  catalyst  water  electrolysis  materials  science  research  technology  Delicious 
october 2011 by asteroza
semiconductor nanowire ultraviolet laser technology Could Kill Viruses and Improve DVDs
Hrm, it just so happens that certain frequencies of UV light can cause a resonant breakdown of CO2 to help in forming a plasma...
UV  zinc  oxide  nanowire  waveguide  electrically  pumped  Fabry-Perot  laser  diode  semiconductor  materials  science  research  technology  nanotechnology  Delicious 
july 2011 by asteroza
Self-Cleaning Anodes: Researchers Develop Nanoparticle Technology That Could Facilitate Cost-Effective Coal-Powered Fuel Cells « Georgia Tech Research News
Barium oxide nanostructure anode coating keeps SOFC clear of coking deposits when using coal gas, operate at 750C for less expensive materials usage. Coal gas poisoning issues not explored.
SOFC  fuelcell  materials  science  reearch  anode  coking  surface  treatment  barium  oxide  nanostructure  nanotechnology  self-cleaning  cleaning  water  mediated  carbon  removal  coal  gas  syngas  vapor  deposition  Delicious 
june 2011 by asteroza
CO2-Free Engine Powers Up
A magnesium burning steam cycle engine, with a proposed regeneration of magnesium reactant from magnesium oxide cycle output via solar powered laser. I wonder what the energy costs of regenerating the reactant are, because the laser is energy intensive, and there probably needs to be some mechanical treatment of the magnesium to make it a fine powder.
mitsubishi  magnesium  injection  cycle  MAGIC  steam  hydrogen  engine  research  oxide  laser  recycling  regeneration  green  energy  Delicious 
june 2011 by asteroza
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