Crystal structure transition of polyrotaxanes attributable to competing rings and backbone induced by in situ modification of the backbone

Polymer ◽  
2014 ◽  
Vol 55 (6) ◽  
pp. 1514-1519 ◽  
Author(s):  
Kazuaki Kato ◽  
Tomoya Ise ◽  
Kohzo Ito
Keyword(s):  
Crystal Structure ◽  
Structure Transition ◽  
In Situ Modification

In Situ Modification and Analysis of the Composition and Crystal Structure of a Silicon Target by Ion-Beam Methods

2018 ◽  
Vol 63 (12) ◽  
pp. 1861-1867 ◽  
Author(s):  
Yu. V. Balakshin ◽  
A. A. Shemukhin ◽  
A. V. Nazarov ◽  
A. V. Kozhemiako ◽  
V. S. Chernysh
Keyword(s):  
Crystal Structure ◽  
Ion Beam ◽  
In Situ Modification ◽  
Silicon Target

In-situ observation of the crystal structure transition of Pt-Sn intermetallic nanoparticles during deactivation and regeneration

2021 ◽  
Author(s):  
Ze-Qi Zhang ◽  
Yuchen Pei ◽  
Mingjun Xiao ◽  
Guowen Hu ◽  
Zhi-Peng Huang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Catalytic Activity ◽  
Intermetallic Compounds ◽  
In Situ Observation ◽  
Structure Transition ◽  
Atomic Structures ◽  
Intermetallic Nanoparticles

Intermetallic compounds nanoparticles (iNPs) have attracted great attention as efficient catalysts for improved activity and selectivity. As the catalytic activity of the iNPs is strongly associated with their atomic structures,...

Single Crystal Growth of High-Pressure Phases of Ice and Salt Hydrate Far Below the Original Melting Point by Mixing Alcohol: Crystal Structure Determination of Magnesium Chloride Heptahydrate

2020 ◽  
Author(s):  
Keishiro Yamashita ◽  
Kazuki Komatsu ◽  
Hiroyuki Kagi
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Crystal Growth ◽  
Single Crystal ◽  
Room Temperature ◽  
Growth Technique ◽  
Salt Hydrate ◽  
X Ray

An crystal-growth technique for single crystal x-ray structure analysis of high-pressure forms of hydrogen-bonded crystals is proposed. We used alcohol mixture (methanol: ethanol = 4:1 in volumetric ratio), which is a widely used pressure transmitting medium, inhibiting the nucleation and growth of unwanted crystals. In this paper, two kinds of single crystals which have not been obtained using a conventional experimental technique were obtained using this technique: ice VI at 1.99 GPa and MgCl<sub>2</sub>·7H<sub>2</sub>O at 2.50 GPa at room temperature. Here we first report the crystal structure of MgCl2·7H2O. This technique simultaneously meets the requirement of hydrostaticity for high-pressure experiments and has feasibility for further in-situ measurements.

In-situ Modification of Graphene Oxide by Insoluble Sulfur and Application for Nitrile Butadiene Rubber

2020 ◽  
Vol 35 (2) ◽  
pp. 221-228
Author(s):  
S.-B. Chen ◽  
T.-X. Li ◽  
S.-H. Wan ◽  
X. Huang ◽  
S.-W. Cai ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Butadiene Rubber ◽  
Nitrile Butadiene Rubber ◽  
In Situ Modification

scholarly journals Seawater Absorption and Adhesion Properties of Hydrophobic and Superhydrophobic Thermoset Epoxy Nanocomposite Coatings

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 272
Author(s):  
Ayman M. Atta ◽  
Mohamed H. El-Newehy ◽  
Meera Moydeen Abdulhameed ◽  
Mohamed H. Wahby ◽  
Ahmed I. Hashem
Keyword(s):  
Thermal Stability ◽  
Oleic Acid ◽  
Salt Spray ◽  
Adhesion Properties ◽  
In Situ Modification ◽  
Long Time ◽  
Seawater Environment ◽  
Thermoset Epoxy ◽  
The Cost

The enhancement of both thermal and mechanical properties of epoxy materials using nanomaterials becomes a target in coating of the steel to protect it from aggressive environmental conditions for a long time, with reducing the cost. In this respect, the adhesion properties of the epoxy with the steel surfaces, and its proper superhyrophobicity to repel the seawater humidity, can be optimized via addition of green nanoparticles (NPs). In-situ modification of silver (Ag) and calcium carbonate (CaCO3) NPs with oleic acid (OA) was carried out during the formation of Ag−OA and CaCO3−OA, respectively. The epoxide oleic acid (EOA) was also used as capping for Ca−O3 NPs by in-situ method and epoxidation of Ag−OA NPs, too. The morphology, thermal stability, and the diameters of NPs, as well as their dispersion in organic solvent, were investigated. The effects of the prepared NPs on the exothermic curing of the epoxy resins in the presence of polyamines, flexibility or rigidity of epoxy coatings, wettability, and coatings durability in aggressive seawater environment were studied. The obtained results confirmed that the proper superhyrophobicity, coating adhesion, and thermal stability of the epoxy were improved after exposure to salt spray fog for 2000 h at 36 °C.

Enantio-Differentiating Hydrogenation of 2-Octanone over Modified Nickel Catalysts Prepared by an In Situ Modification

2002 ◽  
Vol 75 (12) ◽  
pp. 2695-2696 ◽  
Author(s):  
Tsutomu Osawa ◽  
Nobuyo Ozaki ◽  
Tadao Harada ◽  
Osamu Takayasu
Keyword(s):  
Nickel Catalysts ◽  
In Situ Modification
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