What's the difference between zirconia and zirconium?
Zirconia
Definition:
(n.) The oxide of zirconium, obtained as a white powder, and possessing both acid and basic properties. On account of its infusibility, and brilliant luminosity when incandescent, it is used as an ingredient of sticks for the Drummomd light.
Example Sentences:
(1) Purified boveine growth hormone labeled enzymatically with iodine-125 was covalently coupled to cyanogen bromide activated Sepharose 4B gel and to diazotized zirconia-clad glass beads.
(2) Hydroxyapatite ceramics with zirconia dispersion from fine powders synthesized hydrothermally were post-sintered at 1000-1300 degrees C under 200 MPa of argon for 1 h without capsules, after normal sintering in air at 1200 degrees C for 3 h. Densification was most significant with post-sintering at 1200 degrees C. Fracture toughness, Vickers hardness and elastic properties of these materials were investigated.
(3) These studies have shown that phosphate-modified zirconia is a useful high-performance ion-exchange support for the separation of cationic proteins and for blocking the sites responsible for the high affinity of zirconia towards certain anions.
(4) Two commercial investment materials, Ohara and Castmatic, and an experimental zirconia material were analyzed.
(5) A method for preparing cross-section transmission electron microscopy specimens from alumina and partially stabilized zirconia braze joints is described.
(6) Zirconia was used in this study for implant dental roots because of its superior properties over other materials used as dental roots in mechanical strength, toughness, workability, and biocompatibility.
(7) The fibres were examined in the 'as-manufactured' state and after heating at 1200 and 1400 degrees C. Devitrification of the fibres at 1200 degrees C probably gave mullite crystals on the surface and caused the formation of the high-temperature form of cristobalite and, in zirconia grade fibres, the high-temperature, tetragonal form of zirconia as well.
(8) To obtain inlay, crown and bridge types of titanium castings with sufficient size accuracy, zirconia investments with 10 mol % calcia were studied for their setting expansion, thermal expansion, total expansion, casting shrinkage compensation deficiency on fabrication method, particle size of zirconia, calcia and mixing liquid.
(9) Zirconia at 50 micrograms ml-1 adsorbed 99.95% of added E. coli O128 LPS.
(10) In addition, alumina and zirconia ceramic balls are now in routine clinical use in Europe.
(11) Ceramic fibres are manufactured largely from the aluminosilicate group of minerals but some contain only alumina, zirconia or silica.
(12) However, ageing for long periods in Ringer's solution promoted a surface layer of monoclinic zirconia.
(13) Detection of calcium and chlorine also suggested bonding of experimental zirconia via calcium chloride.
(14) Detection of aluminum, silicon, magnesium, zirconium and oxygen provided a basis to reason the presence of alumina (Al2O3), silica (SiO2), magnesia (MgO), and zirconia (ZrO2).
(15) Preliminary evaluation of bare or polymer-coated colloidal monoclinic zirconia of nominal particle size 100 nm indicated that it is an effective adsorbent for pyrogenic lipopolysaccharides (LPS) as measured by chemical and Limulus amebocyte lysate (LAL) assays.
(16) Results suggest the zirconia used is a superior ceramic coating to the alumina.
(17) Further heating changed surface structure and led to zircon production in the zirconia fibres.
(18) Extensive microcracking occurred around refractory particles and through matrix in experimental zirconia which is likely to have resulted from the firing of kyanite to 1400 degrees C, to the monoclinic to tetragonal transformation of any unstabilized ZrO2, or to the thermal expansion mismatch between kyanite and matrix.
(19) We implanted cylinders of alumina ceramics (Al2O3), zirconia ceramics (ZrO2) and SUS-316 L stainless steel into the distal femoral epiphyses of dogs and then made observations from 4 to 96 wk post-operatively.
(20) Some LPS contaminating BSA lacked affinity for zirconia.
Zirconium
Definition:
(n.) A rare element of the carbon-silicon group, intermediate between the metals and nonmetals, obtained from the mineral zircon as a dark sooty powder, or as a gray metallic crystalline substance. Symbol Zr. Atomic weight, 90.4.
Example Sentences:
(1) The sodium (Na) zinc (Zn) and zirconium (Zr) derivatives of PT were studied and the effects of duration of contact and concentration of the NaPT and ZnPT in test solutions were examined.
(2) The elements added to increase radiopacity in the composite materials are barium, strontium, zinc, zirconium, and ytterbium.
(3) The energy was coupled into a 250-microns core diameter zirconium-fluoride fiber.
(4) The residue was taken up with 2 M perchloric acid and zirconium in the solution was extracted with 0.1 M thenoyltrifluoroacetone (TTA) in benzene.
(5) Porous microparticulate zirconium oxide shows very different selectivities and pH dependencies for the separation of benzoic acid derivatives than do conventional bonded-phase anion-exchange supports.
(6) Cellulose was converted into a more reactive form by chelation with the transition metals titanium(III), iron(III), tin(IV), vanadium(III), and zirconium(IV).
(7) A high in vitro stability of the zirconium-desferal complex was observed; less than 0.2% zirconium was lost within 24 h in plasma-solutions.
(8) All processes are based mainly on ion-exchange separations using amorphous zirconium phosphate.
(9) After administration at low doses of soluble salt of hafnium, this element was similarly concentrated in nodular lymphatic cells and was as zirconium uniquely localized in the lysosomes of macrophages where it is associated with phosphorus.
(10) The 99Mo is present as a zirconium molybdate gel, the high molybdate content of which allows the use of (n, gamma) 99Mo.
(11) The cause of this impaired calcemic response was investigated by reinfusing rats with their own urine that had been pretreated with either activated charcoal or zirconium oxide in two different anionic forms, or urine that had been ultrafiltrated through an Amicon membrane of which the stated molecular-weight cut-off of the smallest pore-size membrane was 500 daltons.
(12) Although zirconium fluoride fibers have high through-put efficiencies that facilitate study of laser tissue interactions at 2.94 microns, problems encountered with fragility and solubility of the bare tip in aqueous media limit its usefulness.
(13) An automated method, based on the chelating reaction of calcium disodium edetate with zirconium and the subsequent determination of excess zirconium reacted with xylenol orange, was developed.
(14) In this work we have studied intracellular concentration sites of zirconium after injection of low doses of zirconium sulphate.
(15) Other components registered in quantities of 5-10 wt-% were barium, aluminum, zinc, and zirconium.
(16) Laser energy was delivered as a single pulse (250 microseconds) by tissue fiber optic contact with low hydroxyl-fused silica (200 and 500 microns), zirconium fluoride (250 microns), or sapphire (250 microns) fiber optics.
(17) Despite suspicion that inhalation of zirconium should be capable of causing human pulmonary disease, documentation of zirconium pneumoconiosis in humans has been lacking.
(18) The elements antimony, ruthenium, lead, and cesium were enriched on the smallest particles, indicating that they were in a volatile chemical form, while cerium, zirconium, and radium were nonvolatile at the combustion temperatures.
(19) Alveolar macrophages from the rabbit were exposed in the culture medium to zirconium and aluminum salts.
(20) In subjects exposed to a hot environment, short-term topical pretreatment with aluminium zirconium tetrachlorhydrate delayed the onset of visible sweating although it failed to prevent the response.