Refine your search:     
Report No.
 - 
Search Results: Records 1-16 displayed on this page of 16
  • 1

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Save select records

Journal Articles

Development of evaluation method for diffusion and filtration behavior of colloid in compacted bentonites using dendrimers

Endo, Takashi*; Tachi, Yukio; Ishidera, Takamitsu; Terashima, Motoki

Nihon Genshiryoku Gakkai Wabun Rombunshi, 20(1), p.9 - 22, 2021/03

Evaluation method of colloid diffusion and filtration in compacted bentonites was developed using dendrimers. Diffusion and filtration behavior of PAMAM dendrimers with the size of 5.7$$sim$$7.2nm was investigated by the through-diffusion experiment in bentonite compacted to 0.8 Mg/m$$^{3}$$ and saturated with 0.005$$sim$$0.5mol/L NaCl. Effective diffusivities (De) and filtration ratios (Rf) of dendrimers were determined from the breakthrough curves and the depth profiles in compacted bentonite, respectively. The De values of negatively charged dendrimer increased when porewater salinity increased and dendrimer size decreased as influenced by anion exclusion effect in negatively charged clay surfaces. The Rf values increased when porewater salinity decreased and dendrimer size increased, demonstrating significant fractions of dendrimer were filtered by narrow pores in complex pore networks. These trends consistent with the previous studies emphasize the validity of the evaluation method using dendrimer.

Journal Articles

Post-grouting with colloidal silica at great depth of the Mizunami Underground Research Laboratory, Japan

Tsuji, Masakuni*; Kobayashi, Shinji*; Sato, Toshinori; Mikake, Shinichiro; Matsui, Hiroya

Proceedings of 8th Nordic Grouting Symposium, p.171 - 185, 2016/09

This paper presents the application of a durable liquid-type colloidal silica grout (CSG), to the great depth of the Mizunami Underground Research Laboratory (MIU). The CSG had been invented decades ago in Japan for the purpose of the ground improvement. A post-grouting experiment with the CSG carried out in 300 m depth of MIU confirmed its applicability and good durability at a great depth more than 3 years. Furthermore, a comparison study of applying the CSG between this experiment and a Swedish project indicated good applicability of the Swedish theoretical design to MIU. The CSG with the Swedish design were applied to the post-grouting campaign in a gallery at 500 m depth for further reducing water ingress and for developing the latest grouting methodology. The grouting was successful in reducing the abundant inflow from the rock with many fractures. The conductivity of the grouted rock mass of the latter fans is estimated to be lower than 10$$^{-9}$$ m/s.

Journal Articles

Association of dissolved radionuclides released by the Chernobyl accident with colloidal materials in surface water

Matsunaga, Takeshi; Nagao, Seiya*; Ueno, Takashi; Takeda, Seiji; Amano, Hikaru; Tkachenko, Y.*

Applied Geochemistry, 19(10), p.1581 - 1599, 2004/10

 Times Cited Count:32 Percentile:55.98(Geochemistry & Geophysics)

The association of dissolved $$^{90}$$Sr, $$^{239,240}$$Pu and $$^{241}$$Am with natural colloids was investigated in surface waters in the Chernobyl nuclear accident area by means of ultrafiltration. Results suggest that Pu and Am isotopes were preferentially associated with dissolved humic substances (HS) of high molecular size. A model calculation of the complexation of Pu and Am with HS also supported the above. This study has expanded our understanding of the general role of natural organic colloids in dictating the chemical form of actinides in the surface aquatic environment.

Journal Articles

Radionuclide and colloid migration experiments under deep geological conditions in the underground research laboratory, Canada

Kumata, Masahiro; Nakayama, Shinichi; Vandergraaf, T. T.*; Drew, D. J.*

JAERI-Conf 99-004, p.395 - 410, 1999/03

no abstracts in English

Journal Articles

Preparation of ThO$$_{2}$$ sols suitable for gelation into microspheres in CCl$$_{4}$$-ammonia media

;

Journal of Nuclear Science and Technology, 22(11), p.915 - 921, 1985/00

 Times Cited Count:9 Percentile:74.95(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Preparation of ThO$$_{2}$$ sols having colloid-size distribution suitable for gelation into microspheres

; ; Shiba, Koreyuki

Journal of Nuclear Science and Technology, 21(7), p.528 - 537, 1984/00

 Times Cited Count:11 Percentile:74.29(Nuclear Science & Technology)

no abstracts in English

Journal Articles

On the particle size distribution of hydrolyzed plutonium(IV) polymer

;

Journal of Radioanalytical and Nuclear Chemistry, 84(2), p.269 - 275, 1984/00

 Times Cited Count:6 Percentile:58.06(Chemistry, Analytical)

no abstracts in English

JAEA Reports

Production of ThO$$_{2}$$ Kernels by Sol-gel Process

; ; ; Shiba, Koreyuki

JAERI 1271, 37 Pages, 1981/06

JAERI-1271.pdf:2.65MB

no abstracts in English

JAEA Reports

Sol Production Apparatus of pH Control Type

; ; Shiba, Koreyuki

JAERI-M 9477, 26 Pages, 1981/05

JAERI-M-9477.pdf:1.05MB

no abstracts in English

Journal Articles

Cation exchange behaviour of silver of low concentrations

J.Radioanal.Chem., 43(1), p.81 - 91, 1978/01

no abstracts in English

Journal Articles

Journal Articles

Preparation of emulsifier-free polyethylene latecies by radiation polymerization

; Nakajima, Hayato; Takehisa, Masaaki; Machi, Sueo

Journal of Polymer Science; Polymer Letters Edition, 13(6), p.369 - 375, 1975/06

no abstracts in English

Journal Articles

Colloidal Li metal in neutron-irradiated LiF crystals

Journal of the Physical Society of Japan, 18(11), p.1703 - 1703, 1963/00

 Times Cited Count:7

no abstracts in English

Oral presentation

Groundwater colloid properties in sedimentary rocks; Preliminary results from the Horonobe URL

Sasamoto, Hiroshi; Ohara, Shigeru*

no journal, , 

In the present study, a non-destructive technique using Particle Tracking Analysis (PTA) has been tested to determine size distribution and concentration of colloids in groundwater. The groundwaters were sampled from water-rings (4 samples) located in the vertical shafts and boreholes (6 samples) drilled in the drifts of the Horonobe URL. Results suggest that colloid particle concentrations range from 9.1$$times$$10 $$^{6}$$ to 7.8$$times$$10 $$^{8}$$ particle/mL (pt/mL) and the estimated colloid mass concentrations range from 3.4$$times$$10 $$^{-2}$$ to 4.2 mg/L for the diameter of 1 to 1000 nm, respectively. Colloid concentrations of groundwater sampled from water-rings are generally higher than those sampled from boreholes due to differences in groundwater sampling conditions. For sizes $$>$$ 100 nm of particles, colloid stability was evaluated on the basis of DLVO theory. DLVO theory predicts that particle sizes $$>$$ 100 nm would be unstable (i.e., coagulation could occur). Particle and mass colloid concentrations in the groundwater were therefore reevaluated to obtain the reliable colloid particle concentrations range from 5.8$$times$$10 $$^{6}$$ to 3.0$$times$$10 $$^{8}$$ pt/mL and colloid mass concentrations range from 2.0$$times$$10 $$^{-3}$$ to 1.3$$times$$10 $$^{-1}$$ mg/L for the diameter range $$<$$ 100 nm, respectively. Furthermore, the reevaluated results indicate a negative correlation between colloid concentrations and IS of groundwater.

Oral presentation

Pseudocolloid formation of Uranium with soluble surface glycoprotein of Paramecium

Kozai, Naofumi; Sakamoto, Fuminori; Tanaka, Kazuya; Sato, Takahiro; Kamiya, Tomihiro

no journal, , 

When living Paramecium cells were exposed to a U(VI) aqueous solution, U was hardly detected in the cells, while U was clearly detected in the Paramecium cells that were pre-killed with a fixative before exposure to the U aqueous solution. The U in the liquid phase after the experiment was found to bound to a large soluble glycoprotein to form pseudocolloid. We discuss the relation between these results and the soluble glycoprotein covering the cell surface of Paramecium.

16 (Records 1-16 displayed on this page)
  • 1