Release behavior of tritium in pure copper and its alloys into pure water at ambient temperature

2016 ◽  
Vol 113 ◽  
pp. 227-230 ◽  
Author(s):  
Teppei Otsuka ◽  
Yusuke Ogawa ◽  
Hiroki Horinouchi ◽  
Kenichi Hashizume
Keyword(s):  
Ambient Temperature ◽  
Pure Water ◽  
Pure Copper ◽  
Release Behavior

Swelling Behavior and Drug Release of Polymer Coated Nano Iron Oxide Embedded Hydroxyapatite

2019 ◽  
Vol 829 ◽  
pp. 108-113
Author(s):  
Yoshiyuki Yokogawa ◽  
Rina Ohkura ◽  
Yoko Inoue ◽  
Atsumasa Shishido ◽  
Ereath Beeran Ansar ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Elevated Temperature ◽  
Ambient Temperature ◽  
Polyelectrolyte Complex ◽  
Elevated Temperatures ◽  
Release Behavior ◽  
Swelling Properties ◽  
Gel Beads ◽  
Calcium Alginate Gel ◽  
Ca Alginate

Spherical calcium-alginate gel beads containing HAIO, iron oxide (IO) nanoparticles embedded on hydroxapatite (HA), were prepared along with and poly (N-isopropylacrylamide) (PNIPAAM) or chitosan. These spheres, HAIO, HAIO-PNIPAAM and HAIO-chitosan spheres, were used as carriers of 5-fluorouracil (5-FU), one of the drugs for cancer chemical therapy, and the 5-FU release behavior in PBS solution was investigated at ambient and elevated temperatures using U-V spectrometry. The amount of the released 5-FU from the HAIO spheres was somewhat higher than that from HAIO-PNIPAAM and HAIO-chitosan spheres at ambient temperature. At elevated temperature, HAIO spheres showed an increase in quantity of released 5-FU. The amount of released 5-FU from HAIO-PNIPAAM spheres was almost the same, and that from HAIO-chitosan spheres was reduced compared to those at ambient temperature. These spheres, HAIO, HAIO-PNIPAAM and HAIO-chitosan spheres, show the similar swelling properties at elevated temperature. However, the combinations of Ca-alginate - PNIPAAM or Ca-alginate - chitosan may produce the different structures, which are core-shell network for HAIO-PNIPAAM spheres and or a polyelectrolyte complex for HAIO-chitosan spheres, leading to a different release behavior of 5-FU.

Preparation of Calcium-Phosphate Microspheres by Salt-Assisted Ultrasonic Spray-Pyrolysis Technique and their Drug Release Behavior Using Anti-Angiogenic Agent, TNP-470

2011 ◽  
Vol 493-494 ◽  
pp. 672-677
Author(s):  
Masaru Matsueda ◽  
Makoto Emoto ◽  
Mamoru Aizawa
Keyword(s):  
Spray Pyrolysis ◽  
Spray Pyrolysis Technique ◽  
Pure Water ◽  
Ultrasonic Spray Pyrolysis ◽  
Potassium Nitrate ◽  
Chloride Ions ◽  
Release Behavior ◽  
Ultrasonic Spray Pyrolysis Technique ◽  
Ultrasonic Spray ◽  
Particle Shapes

Synthetic clcium phosphate based materials, such as hydroxyapatite (Ca10(PO4)6(OH)2; HAp) and tricalcium phosphate (Ca3(PO4)2; TCP), are compounds with high potential for clinical applications to orthopedic and dental region. In previous study, we have reported that the hollow and porous apatite microsphere could be prepared by salt-assisted ultrasonic spray-pyrolysis (SAUSP) technique using sodium chloride (NaCl). In this case, these microspheres have some problems of (i) decrease of dissolubility of microspheres and (ii) cytotoxicity arising from chloride ions elution. To overcome these disadvantages, we prepared novel microspheres by SAUSP technique using potassium nitrate (KNO3) instead of NaCl. The resulting microsphere was washed with pure water to remove the KNO3 phase. The particle shapes of the powders were observed by scanning electron microscopy (SEM); the diameters of the microspheres were of 0.5 - 3.0 m, and the fine pores with the sizes of ~50 nm were present on the surface of the microspheres. The TNP-470 agent as a model of drug were loaded on these microspheres with nano-pores in the surface. In the KNO3 concentration of 1.00 mol·dm-3, 70 % of the total TNP-470 from the microspheres was rapidly released within 1 h. The remaining 30 % was slowly released up to 24 h following immersion, and total amount of TNP-470 released from the microspheres was 42 g·mg-1.

Corrosion and ion release behavior of ultra-fine grained bulk pure copper fabricated by ECAP in Hanks solution as potential biomaterial for contraception

2010 ◽  
Vol 64 (4) ◽  
pp. 524-527 ◽  
Author(s):  
X.X. Xu ◽  
F.L. Nie ◽  
J.X. Zhang ◽  
W. Zheng ◽  
Y.F. Zheng ◽  
...  
Keyword(s):  
Pure Copper ◽  
Release Behavior ◽  
Ion Release ◽  
Fine Grained

Migration and release behavior of tritium in SS316 at ambient temperature

2007 ◽  
Vol 363-365 ◽  
pp. 462-466 ◽  
Author(s):  
Y. Torikai ◽  
D. Murata ◽  
R.-D. Penzhorn ◽  
K. Akaishi ◽  
K. Watanabe ◽  
...  
Keyword(s):  
Ambient Temperature ◽  
Release Behavior

scholarly journals Metal Release Behavior of Surface Oxidized Stainless Steels into Flowing High Temperature Pure Water

1987 ◽  
Vol 36 (7) ◽  
pp. 419-430 ◽  
Author(s):  
Kazuo Fujiwara ◽  
Haruo Tomari ◽  
Takenori Nakayama ◽  
Kazutoshi Shimogori ◽  
Kenkichi Ishigure ◽  
...  
Keyword(s):  
High Temperature ◽  
Stainless Steels ◽  
Pure Water ◽  
Metal Release ◽  
Release Behavior

Decoration of specific sites on freeze-fractured membranes

1978 ◽  
Vol 36 (2) ◽  
pp. 140-141
Author(s):  
H. Gross ◽  
H. Moor
Keyword(s):  
Pure Water ◽  
Freeze Fracture ◽  
Chemical Properties ◽  
Surface Forces ◽  
Sulfate Pentahydrate ◽  
Copper Sulfate Pentahydrate ◽  
Physico Chemical ◽  
Water Of Hydration ◽  
Small Container ◽  
Binding Forces

Fracturing under ultrahigh vacuum (UHV, p ≤ 10-9 Torr) produces membrane fracture faces devoid of contamination. Such clean surfaces are a prerequisite foe studies of interactions between condensing molecules is possible and surface forces are unequally distributed, the condensate will accumulate at places with high binding forces; crystallites will arise which may be useful a probes for surface sites with specific physico-chemical properties. Specific “decoration” with crystallites can be achieved nby exposing membrane fracture faces to water vopour. A device was developed which enables the production of pure water vapour and the controlled variation of its partial pressure in an UHV freeze-fracture apparatus (Fig.1a). Under vaccum (≤ 10-3 Torr), small container filled with copper-sulfate-pentahydrate is heated with a heating coil, with the temperature controlled by means of a thermocouple. The water of hydration thereby released enters a storage vessel.

SEM of non-coated hepatocellular cytoskeleton of perfused livers

1984 ◽  
Vol 42 ◽  
pp. 306-307
Author(s):  
S.W. French ◽  
N.C. Benson ◽  
C. Davis-Scibienski
Keyword(s):  
Ambient Temperature ◽  
Critical Point ◽  
Protease Inhibitors ◽  
Metal Deposition ◽  
Heat Damage ◽  
Detergent Extraction ◽  
Cytoskeletal Elements ◽  
Triton X ◽  
Excised Tissue

Previous SEM studies of liver cytoskeletal elements have encountered technical difficulties such as variable metal coating and heat damage which occurs during metal deposition. The majority of studies involving evaluation of the cell cytoskeleton have been limited to cells which could be isolated, maintained in culture as a monolayer and thus easily extracted. Detergent extraction of excised tissue by immersion has often been unsatisfactory beyond the depth of several cells. These disadvantages have been avoided in the present study. Whole C3H mouse livers were perfused in situ with 0.5% Triton X-100 in a modified Jahn's buffer including protease inhibitors. Perfusion was continued for 1 to 2 hours at ambient temperature. The liver was then perfused with a 2% buffered gluteraldehyde solution. Liver samples including spontaneous tumors were then maintained in buffered gluteraldehyde for 2 hours. Samples were processed for SEM and TEM using the modified thicarbohydrazide procedure of Malich and Wilson, cryofractured, and critical point dried (CPD). Some samples were mechanically fractured after CPD.

Formation of Dislocation Channels in Neutron Irradiated Molybdenum

1972 ◽  
Vol 30 ◽  
pp. 672-673
Author(s):  
S. Mahajan
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Ambient Temperature ◽  
Room Temperature ◽  
Channel Formation ◽  
Early Stages ◽  
Transmission Electron ◽  
Three Stages ◽  
Two Stages ◽  
Polycrystalline Molybdenum

The evolution of dislocation channels in irradiated metals during deformation can be envisaged to occur in three stages: (i) formation of embryonic cluster free regions, (ii) growth of these regions into microscopically observable channels and (iii) termination of their growth due to the accumulation of dislocation damage. The first two stages are particularly intriguing, and we have attempted to follow the early stages of channel formation in polycrystalline molybdenum, irradiated to 5×1019 n. cm−2 (E > 1 Mev) at the reactor ambient temperature (∼ 60°C), using transmission electron microscopy. The irradiated samples were strained, at room temperature, up to the macroscopic yield point.Figure 1 illustrates the early stages of channel formation. The observations suggest that the cluster free regions, such as A, B and C, form in isolated packets, which could subsequently link-up to evolve a channel.

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