scholarly journals Some Considerations on the Packing Structure of Powderlike Materials during Dry Pressing Procedure

1964 ◽  
Vol 13 (127) ◽  
pp. 237-242 ◽  
Author(s):  
Akira WATANABE ◽  
Kaoru UMEYA
Keyword(s):  
Packing Structure ◽  
Dry Pressing

Visualization and Manipulation of Molecular Motion in Solid State through Photo-Induced Clusteroluminescence

2019 ◽  
Author(s):  
Haoke Zhang ◽  
Lili Du ◽  
Lin Wang ◽  
Junkai Liu ◽  
Qing Wan ◽  
...  
Keyword(s):  
Quantum Mechanics ◽  
Excited State ◽  
Solid State ◽  
Light Source ◽  
Molecular Motion ◽  
Molecular Machine ◽  
Conjugated Molecules ◽  
Time Resolved ◽  
Packing Structure ◽  
New Strategy

<p>Building molecular machine has long been a dream of scientists as it is expected to revolutionize many aspects of technology and medicine. Implementing the solid-state molecular motion is the prerequisite for a practical molecular machine. However, few works on solid-state molecular motion have been reported and it is almost impossible to “see” the motion even if it happens. Here the light-driven molecular motion in solid state is discovered in two non-conjugated molecules <i>s</i>-DPE and <i>s</i>-DPE-TM, resulting in the formation of excited-state though-space complex (ESTSC). Meanwhile, the newly formed ESTSC generates an abnormal visible emission which is termed as clusteroluminescence. Notably, the original packing structure can recover from ESTSC when the light source is removed. These processes have been confirmed by time-resolved spectroscopy and quantum mechanics calculation. This work provides a new strategy to manipulate and “see” solid-state molecular motion and gains new insights into the mechanistic picture of clusteroluminescence.<br></p>

scholarly journals Mechanism of Plasticity Development for Ceramic Dough (Part 2) - Investigation on Plasticity by Particle Packing Structure.

1999 ◽  
Vol 107 (1241) ◽  
pp. 54-59 ◽  
Author(s):  
Shuji KAWAI ◽  
Yukari ICHIKAWA ◽  
Hideki ISHIDA ◽  
Yasuo SHIBASAKI ◽  
Kiichi ODA
Keyword(s):  
Particle Packing ◽  
Packing Structure

Preparation and Properties of Porous Si3N4/SiO2/BN Composite Ceramics

2012 ◽  
Vol 512-515 ◽  
pp. 828-831 ◽  
Author(s):  
Wei Dong ◽  
Chang An Wang ◽  
Lei Yu ◽  
Shi Xi Ouyang
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
High Strength ◽  
Low Dielectric Constant ◽  
Pressureless Sintering ◽  
Composite Ceramics ◽  
Porous Si ◽  
Low Dielectric ◽  
Dry Pressing ◽  
Porous Si3n4

Porous Si3N4/SiO2/BN composite ceramics with high strength and low dielectric constant were prepared by dry-pressing process and pressureless sintering at 1750°C for 1.5 h in flow nitrogen. The influences of BN content on microstructure, porosity, mechanical and dielectric properties of the porous Si3N4/SiO2/BN composite ceramics were discussed. The results showed that the porous Si3N4/SiO2/BN composite ceramics with porosity ranging from 29% to 48% were fabricated by adjusting the content of BN. The flexural strength of the porous Si3N4/SiO2/BN composite ceramics was 78215 MPa. The dielectric constant of the porous Si3N4/SiO2/BN composite ceramics was 3.9~5 at 1 MHz.

Distorted cone conformation and unique packing structure of p-sulfonatocalix[5]arene via complexation of N-methyl-N′-(naphthalen-2-ylmethyl)-4,4′-bipyridinium

Tetrahedron ◽  
2016 ◽  
Vol 72 (41) ◽  
pp. 6558-6565 ◽  
Author(s):  
Kui Wang ◽  
Hong-Qing Zhang ◽  
Si-Yang Xing ◽  
Xiu-Guang Wang ◽  
Hong-Xi Dou ◽  
...  
Keyword(s):  
Cone Conformation ◽  
Packing Structure

Packing Structure of OTS on Silicon Surfaces: A Computational Approach

2005 ◽  
Author(s):  
J. Barriga ◽  
B. Coto ◽  
B. Ferna´ndez
Keyword(s):  
Molecular Orientation ◽  
Md Simulations ◽  
Silicon Surfaces ◽  
Computational Simulations ◽  
Self Assembled Monolayer ◽  
Substitution Pattern ◽  
Optimal Packing ◽  
Packing Structure ◽  
Energetic Balance ◽  
Main Factors

Optimal packing structure of Octadecyltrichlorosilane (OTS) self-assembled monolayer (SAM) adsorbed on a SiO2 surface with a Si (100) substrate was studied performing molecular dynamics (MD) computational simulations. Molecular substitution, substitution pattern and molecular orientation of the OTS molecules on the SiO2 (100) are the main factors studied in order to determine the optimal packing structure taking into account energetic balance. We have used the optimal packing structure to study other properties usually used to characterize SAMs as molecular and system tilt angles, film thickness and gauche defects. These properties and monolayer stability were studied performing MD simulations in a temperature range from 100 K to 600 K and we found that results obtained agree with those from experimental measurements. We found that OTS films are stable up to 500 K. The optimal structure obtained could be used in further MD simulations studies in order to determine tribological properties of OTS-SiO2 systems.

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