scholarly journals Highly Porous Polymer-Derived Bioceramics Based on a Complex Hardystonite Solid Solution

Materials ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 3970 ◽  
Author(s):  
Hamada Elsayed ◽  
Michele Secco ◽  
Federico Zorzi ◽  
Katharina Schuhladen ◽  
Rainer Detsch ◽  
...  
Keyword(s):  
Solid Solution ◽  
Glassy Phase ◽  
Porous Polymer ◽  
Phase Assemblage ◽  
Calcium Borate ◽  
Direct Ink Writing ◽  
Density Ratios ◽  
Porous Bioceramics ◽  
Highly Porous ◽  
Hydrated Calcium

Highly porous bioceramics, based on a complex hardystonite solid solution, were developed from silicone resins and micro-sized oxide fillers fired in air at 950 °C. Besides CaO, SrO, MgO, and ZnO precursors, and the commercial embedded silicone resins, calcium borate was essential in providing the liquid phase upon firing and favouring the formation of an unprecedented hardystonite solid solution, corresponding to the formula (Ca0.70Sr0.30)2(Zn0.72Mg0.15Si0.13) (Si0.85B0.15)2O7. Silicone-filler mixtures could be used in the form of thick pastes for direct ink writing of reticulated scaffolds or for direct foaming. The latter shaping option benefited from the use of hydrated calcium borate, which underwent dehydration, with water vapour release, at a low temperature (420 °C). Both scaffolds and foams confirmed the already-obtained phase assemblage, after firing, and exhibited remarkable strength-to-density ratios. Finally, preliminary cell tests excluded any cytotoxicity that could be derived from the formation of a boro-silicate glassy phase.

Cryostructuration as a tool for preparing highly porous polymer materials

2011 ◽  
Vol 2 (5) ◽  
pp. 1059 ◽  
Author(s):  
Harald Kirsebom ◽  
Bo Mattiasson
Keyword(s):  
Porous Polymer ◽  
Polymer Materials ◽  
Highly Porous

scholarly journals Ethanol steam reforming over Co Ru nanoparticles supported on highly porous polymer-based carbon material

2019 ◽  
Vol 128 ◽  
pp. 105717 ◽  
Author(s):  
Mikhail N. Efimov ◽  
Elena Yu. Mironova ◽  
Andrey A. Vasilev ◽  
Dmitriy G. Muratov ◽  
Aleksey A. Averin ◽  
...  
Keyword(s):  
Steam Reforming ◽  
Carbon Material ◽  
Porous Polymer ◽  
Ethanol Steam Reforming ◽  
Ru Nanoparticles ◽  
Highly Porous ◽  
Ethanol Steam

Effect of Gallium Oxide on Phase Assemblage in Apatite and Whitlockite Hosts for Waste Immobilization

2008 ◽  
Vol 1107 ◽  
Author(s):  
Lee. A. Gerrard ◽  
Shirley. K. Fong ◽  
Brian. L. Metcalfe ◽  
Ian. W. Donald
Keyword(s):  
Solid Solution ◽  
Gallium Oxide ◽  
Phase Assemblage ◽  
X Ray Diffraction ◽  
Apatite Phase ◽  
Complete Solid Solution ◽  
Total Phase ◽  
Simulated Waste ◽  
Lower Temperature ◽  
Gallium Phosphate

AbstractTo immobilize halide and actinide ions present in specific ILW waste a process has been developed that uses mineral phases as the host material. The mechanism of substitution of gallium into these phases will have a large effect on the phase assemblage. This will inevitably affect the total amount of halide that can be immobilized in to total phase mixture.The full simulated waste stream composition containing varying concentrations (1–40 wt.%) of gallium oxide was studied. Also nominal compositions for gallium doped fluorapatites (Ca10-1.5xGax)F2(PO4)6 (x = 0, 0.25, 0.5, 0.75, 1.0) and gallium doped whitlockites Ca9Gay(PO4)6+y (x = 0.2, 0.4, 0.6, 0.8, 1.0) were prepared at 750–1050 °C.These were studied by powder x-ray diffraction (XRD) to determine the phase assemblage and solid solution limits of gallium in the apatite and whitlockite phases. It was found that a complete solid solution was formed between whitlockite, Ca3(PO4)2, and Ca9Gay(PO4)6+y. In the nominal apatite compositions it was found that gallium did not substitute into the apatite structure but was instead partitioned over Ca9Gay(PO4)6+y, gallium phosphate, and unreacted gallium oxide. At higher temperatures gallium suppressed the formation of the apatite phase and was largely partitioned into the Ca9Gay(PO4)6+y phase whereas at lower temperature the majority was present as unreacted Ga2O3. In the full DCHP compositions it was found that gallium is likely to be partitioned over a number of phases including apatite, cationdoped whitlockite and gallium phosphate.

Wave Polymerization During Vapor Deposition of Porous Parylene-N Dielectric Films

1999 ◽  
Vol 565 ◽  
Author(s):  
James Erjavec ◽  
John Sikita ◽  
Stephen P. Beaudoin ◽  
Gregory B. Raupp
Keyword(s):  
Reaction Front ◽  
Wave Process ◽  
Liquid Nitrogen Temperature ◽  
Porous Polymer ◽  
Polymerization Process ◽  
Dielectric Films ◽  
Chamber Pressure ◽  
Porous Films ◽  
Deposition Rates ◽  
Highly Porous

AbstractParylene-N films vapor deposited near liquid nitrogen temperature (77 K) undergo a unique ‘wave’ polymerization process in which a rapidly moving reaction front is apparent as the film changes from translucent to optically opaque. This moving reaction front produces a highly porous polymer film. The porosity of these films is approximately 80%. By capturing the wave process on video we have quantified the moving ‘wave’ velocity, which averages 11 cm/s. Timeaveraged deposition rates of the resulting opaque, porous films are more than 8 μm/min. This rate is more than two orders of magnitude greater than the measured deposition rates of nonporous films that are deposited at higher temperatures, at otherwise fixed conditions of monomer delivery rate and deposition chamber pressure.

THE STRUCTURE OF PRICEITE, A BASIC HYDRATED CALCIUM BORATE, BY AB INITIO POWDER-DIFFRACTION METHODS

2002 ◽  
Vol 40 (4) ◽  
pp. 1199-1206 ◽  
Author(s):  
K. S. Wallwork ◽  
A. Pring ◽  
M. R. Taylor ◽  
B. A. Hunter
Keyword(s):  
Ab Initio ◽  
Powder Diffraction ◽  
Calcium Borate ◽  
Hydrated Calcium

Nanoporous carbon doped ceria bismuth oxide solid solution for photocatalytic water splitting

2021 ◽  
Author(s):  
Kahkashanan Ansari ◽  
Saurabh Dalela ◽  
Sudhish Kumar ◽  
Neelu Chouhan
Keyword(s):  
Solid Solution ◽  
Water Splitting ◽  
Solid Solutions ◽  
Bismuth Oxide ◽  
Solution Method ◽  
Fluorite Phase ◽  
Doped Ceria ◽  
Carbon Doped ◽  
Oxide Solid Solution ◽  
Highly Porous

A series of carbon-doped solid solutions of ceria bismuth oxide (CBO) was prepared by solid solution method. Highly porous solid solutions crystallized in a fluorite phase and exhibited the enhanced...

Highly porous polymer nanofibrous aerogels cross-linked via spontaneous inter-fiber stereocomplexation and their potential for capturing ultrafine airborne particles

Polymer ◽  
2019 ◽  
Vol 179 ◽  
pp. 121649 ◽  
Author(s):  
Xiu Yun Daphne Ma ◽  
Jia Ming Ang ◽  
Youfang Zhang ◽  
Zhihui Zeng ◽  
Chenyang Zhao ◽  
...  
Keyword(s):  
Airborne Particles ◽  
Porous Polymer ◽  
Highly Porous

Effect of Highly Porous Bioceramics Based on ZrO2–Y2O3–CeO2 System on the Biological Tissues of Experimental Animals

2021 ◽  
Vol 12 (2) ◽  
pp. 370-376
Author(s):  
M. V. Kalinina ◽  
N. Yu. Kovalko ◽  
D. N. Suslov ◽  
Yu. S. Andozhskaia ◽  
O. V. Galibin ◽  
...  
Keyword(s):  
Biological Tissues ◽  
Experimental Animals ◽  
Porous Bioceramics ◽  
Highly Porous
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