Hydrothermal decomposition of cellulose using strong gravitational field

2017 ◽  
Vol 120 ◽  
pp. 379-383 ◽  
Author(s):  
Nasrin Jewena ◽  
Ryota Miyanomae ◽  
Mitsuru Sasaki ◽  
Tsutomu Mashimo
Keyword(s):  
Gravitational Field ◽  
Strong Gravitational Field

Sedimentation of Impurity Atoms in InSb Semiconductor under a Strong Gravitational Field

2009 ◽  
Vol 289-292 ◽  
pp. 319-322 ◽  
Author(s):  
Yusuke Iguchi ◽  
Masao Ono ◽  
Satoru Okayasu ◽  
Tsutomu Mashimo
Keyword(s):  
Gravitational Field ◽  
Vapor Deposition ◽  
Physical Vapor Deposition ◽  
Atomic Scale ◽  
Semiconductor Materials ◽  
Strong Gravitational Field ◽  
Impurity Atoms ◽  
Graded Structure ◽  
Alloys And Compounds ◽  
Crystal Wafer

An atomic-scale graded structure has been formed by sedimentation of substitutional atoms under an ultra-strong gravitational field of 1 million G level in alloys and compounds. In this study, we investigate the sedimentation of impurity atoms in semiconductor materials under a strong gravitational field. High-temperature ultracentrifuge experiments (0.59×106 G, 400°C, 60 hours) have been performed on an InSb single crystal wafer which surface was coated with Ge by means of Physical Vapor Deposition (PVD). It was observed that the penetration depth of diffused Ge atoms under the gravitational field was several times larger than under terrestrial field at the same temperatures.

Crystal-Grain Refinement of Materials under an Ultra-Strong Gravitational Field

2006 ◽  
pp. 639-642
Author(s):  
Y. Iguchi ◽  
H. Shibata ◽  
Y. Uchida ◽  
Xin Sheng Huang ◽  
Masao Ono ◽  
...  
Keyword(s):  
Gravitational Field ◽  
Grain Refinement ◽  
Strong Gravitational Field

Formation of Amorphous Graded Structure in Bi3Pb7 Intermetallic Compounds under Strong Gravitational Field

2009 ◽  
Vol 289-292 ◽  
pp. 357-360 ◽  
Author(s):  
Tsutomu Mashimo ◽  
Yusuke Iguchi ◽  
Rabaya Bagum ◽  
Tomokazu Sano ◽  
S. Takeda ◽  
...  
Keyword(s):  
Gravitational Field ◽  
Intermetallic Compound ◽  
Intermetallic Compounds ◽  
Amorphous Structure ◽  
Strong Gravitational Field ◽  
Graded Structure ◽  
Homogeneous Phase ◽  
Graded Structures ◽  
Gravity Direction

A visible four-layers structure with anomalous nano-sturucture was formed from a homogeneous -phase Bi3Pb7 intermetallic compound under a strong gravitational field (1.02x106 G, 130°C, 100 hours). In the 4th layer (lowest-gravity region), pure Bi particles precipitate. In the 2nd 3rd layers, composition graded structures, where Pb content increased along the gravity direction, were formed. It was found that the very broad XRD peak appeared in the 2nd layer, which indicated that an amorphous structure was contained.

Sedimentation of Substitutional Solute Atoms in Intermetallic Compound of Bi-Pb System under Ultra-Strong Gravitational Field

2005 ◽  
Vol 237-240 ◽  
pp. 1101-1106 ◽  
Author(s):  
Masao Ono ◽  
Xin Sheng Huang ◽  
Takahiro Kinoshita ◽  
Hideto Ueno ◽  
Toyotaka Osakabe ◽  
...  
Keyword(s):  
Gravitational Field ◽  
Intermetallic Compound ◽  
Time Duration ◽  
Experimental Conditions ◽  
Strong Gravitational Field ◽  
Weak Gravitational Field ◽  
Substitutional Solute ◽  
Starting State ◽  
Solute Atoms ◽  
Composition Changes

Ultra-strong gravitational field can induce sedimentation of even atoms in condensed matter. We had realized sedimentation of substitutional solute atoms in some miscible alloys. In this study, the ultra-centrifuge experiments were performed on an intermetallic compound of Bi-Pb system (Bi3Pb7) by changing time duration of experiment time (experimental conditions; maximum centrifugal force: 1.0x106g level, temperature: 130-150 °C, duration: 30-150h, state: solid). Composition changes were observed in the centrifuged samples. And, it was found that the Bi phase appeared from starting state of Bi3Pb7 around the weak gravitational field region of the sample. These results showed that sedimentation of substitutional solute atoms occurred, and induced the structure change in intermetallic compounds.

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