A user's guide to the thiol-thioester exchange in organic media: scope, limitations, and applications in material science

2018 ◽  
Vol 9 (36) ◽  
pp. 4523-4534 ◽  
Author(s):  
Brady T. Worrell ◽  
Sudheendran Mavila ◽  
Chen Wang ◽  
Taylor M. Kontour ◽  
Chern-Hooi Lim ◽  
...  
Keyword(s):  
Material Science ◽  
Room Temperature ◽  
Organic Media ◽  
Crosslinked Polymers ◽  
Thioester Exchange ◽  
Dynamic Exchange

The dynamic exchange of thiols and thioesters in organic media was explored, leading to room temperature plasticity in crosslinked polymers.

Accelerating dynamic exchange and self-healing using mechanical forces in crosslinked polymers

2020 ◽  
Vol 7 (6) ◽  
pp. 1581-1587 ◽  
Author(s):  
Nethmi De Alwis Watuthanthrige ◽  
Ballal Ahammed ◽  
Madison T. Dolan ◽  
Qinghua Fang ◽  
Jian Wu ◽  
...  
Keyword(s):  
Room Temperature ◽  
Mechanical Forces ◽  
Self Healing ◽  
Ambient Conditions ◽  
Crosslinked Polymers ◽  
Dynamic Exchange

Surprisingly, a few seconds–minutes of compression at room temperature can increase the rate of dynamic bond exchange as measured by better self-healing, even for thermoresponsive dynamic bonds which do not exchange under ambient conditions.

Room-Temperature Self-Healable and Remoldable Cross-linked Polymer Based on the Dynamic Exchange of Disulfide Bonds

2014 ◽  
Vol 26 (6) ◽  
pp. 2038-2046 ◽  
Author(s):  
Zhou Qiao Lei ◽  
Hong Ping Xiang ◽  
Yong Jian Yuan ◽  
Min Zhi Rong ◽  
Ming Qiu Zhang
Keyword(s):  
Disulfide Bonds ◽  
Room Temperature ◽  
Dynamic Exchange

scholarly journals Thermoelectric characteristics of X$$_2$$YH$$_2$$ monolayers (X=Si, Ge; Y=P, As, Sb, Bi): a first-principles study

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mohammad Ali Mohebpour ◽  
Shobair Mohammadi Mozvashi ◽  
Sahar Izadi Vishkayi ◽  
Meysam Bagheri Tagani
Keyword(s):  
Thermoelectric Materials ◽  
First Principles ◽  
Material Science ◽  
Figure Of Merit ◽  
Density Functional ◽  
Room Temperature ◽  
Boltzmann Transport Equation ◽  
Boltzmann Transport ◽  
Functional Theory ◽  
The Density Functional Theory

AbstractEver since global warming emerged as a serious issue, the development of promising thermoelectric materials has been one of the main hot topics of material science. In this work, we provide an in-depth understanding of the thermoelectric properties of X$$_2$$ 2 YH$$_2$$ 2 monolayers (X=Si, Ge; Y=P, As, Sb, Bi) using the density functional theory combined with the Boltzmann transport equation. The results indicate that the monolayers have very low lattice thermal conductivities in the range of 0.09−0.27 Wm$$^{-1}$$ - 1 K$$^{-1}$$ - 1 at room temperature, which are correlated with the atomic masses of primitive cells. Ge$$_2$$ 2 PH$$_2$$ 2 and Si$$_2$$ 2 SbH$$_2$$ 2 possess the highest mobilities for hole (1894 cm$$^2$$ 2 V$$^{-1}$$ - 1 s$$^{-1}$$ - 1 ) and electron (1629 cm$$^2$$ 2 V$$^{-1}$$ - 1 s$$^{-1}$$ - 1 ), respectively. Si$$_2$$ 2 BiH$$_2$$ 2 shows the largest room-temperature figure of merit, $$ZT=2.85$$ Z T = 2.85 in the n-type doping ( $$\sim 3\times 10^{12}$$ ∼ 3 × 10 12  cm$$^{-2}$$ - 2 ), which is predicted to reach 3.49 at 800 K. Additionally, Si$$_2$$ 2 SbH$$_2$$ 2 and Si$$_2$$ 2 AsH$$_2$$ 2 are found to have considerable ZT values above 2 at room temperature. Our findings suggest that the mentioned monolayers are more efficient than the traditional thermoelectric materials such as Bi$$_2$$ 2 Te$$_3$$ 3 and stimulate experimental efforts for novel syntheses and applications.

Pd(OAc)2 in WERSA: a novel green catalytic system for Suzuki–Miyaura cross-coupling reactions at room temperature

2015 ◽  
Vol 51 (57) ◽  
pp. 11489-11492 ◽  
Author(s):  
Preeti Rekha Boruah ◽  
Abdul Aziz Ali ◽  
Mitali Chetia ◽  
Bishwajit Saikia ◽  
Diganta Sarma
Keyword(s):  
Catalytic System ◽  
Room Temperature ◽  
Cross Coupling ◽  
Catalyst System ◽  
Reusable Catalyst ◽  
Organic Media ◽  
Coupling Reactions ◽  
Cross Coupling Reactions

Pd(OAc)2–WERSA as a novel, efficient and recyclable/reusable catalyst system for Suzuki–Miyaura cross-coupling reactions at room temperature. This is a ligand/base/promoter/additive/organic media free protocol.

Single-chain crosslinked polymers via the transesterification of folded polymers: from efficient synthesis to crystallinity control

2020 ◽  
Vol 11 (32) ◽  
pp. 5181-5190 ◽  
Author(s):  
Daiki Ito ◽  
Yoshihiko Kimura ◽  
Mikihito Takenaka ◽  
Makoto Ouchi ◽  
Takaya Terashima
Keyword(s):  
Crystallization Behavior ◽  
Random Copolymers ◽  
Organic Media ◽  
Efficient Synthesis ◽  
Single Chain ◽  
Crosslinked Polymers

Herein we report efficient synthetic systems of single-chain crosslinked polymers via the intramolecular transesterification of folded random copolymers in organic media and the unique crystallization behavior of their crosslinked polymers.

The Effects of Organic Solvents on Catalytic Behavior of Immobilized Hemoglobin Nanocomposites: Functional Groups and Molecular Constitution

2011 ◽  
Vol 233-235 ◽  
pp. 1556-1559
Author(s):  
Shu Ge Peng ◽  
Yong Ke Guo ◽  
Xiao Fei Liu ◽  
Jun Zhang
Keyword(s):  
Catalytic Activity ◽  
Functional Groups ◽  
Organic Solvents ◽  
Room Temperature ◽  
Organic Media ◽  
Enzymatic Reactions ◽  
Catalytic Behavior ◽  
Reaction Systems ◽  
Molecular Constitution ◽  
Reaction Media

The use of organic solvents as reaction media for enzymatic reactions provides numerous industrially attractive advantages compared to traditional aqueous reaction systems. Hemoglobin (Hb) intercalated magadiite nano-composites was successfully prepared by exfoliation-reassembly method at room temperature and pH=7, and was used to catalyze the oxidation of o-phenylenediamine in organic solvents. Catalytic activity of immobilized Hb in organic solvents with different hydrophobicity and different functional groups were investigated detailedly. The results showed that functional groups and molecular constitution of the organic solvents were both important factors to determine catalytic activity of immobilized Hb in organic media except hydrophobicity of organic solvents.

Catalyst-free dynamic exchange of aromatic Schiff base bonds and its application to self-healing and remolding of crosslinked polymers

2015 ◽  
Vol 3 (39) ◽  
pp. 19662-19668 ◽  
Author(s):  
Zhou Qiao Lei ◽  
Pu Xie ◽  
Min Zhi Rong ◽  
Ming Qiu Zhang
Keyword(s):  
Schiff Base ◽  
Self Healing ◽  
Crosslinked Polymers ◽  
Catalyst Free ◽  
Dynamic Exchange ◽  
Free Dynamic

Crosslinked polyacrylate is self-healed and reprocessed through rearrangement of networks based on catalyst-free dynamic exchange of aromatic Schiff base bonds.

Dependence of Intergranular Fracture on Boundary Topography and Cohesion

1973 ◽  
Vol 31 ◽  
pp. 150-151
Author(s):  
J. E. Doherty ◽  
A. F. Giamei ◽  
B. H. Kear ◽  
C. W. Steinke
Keyword(s):  
Grain Boundary ◽  
Room Temperature ◽  
Nickel Base Superalloy ◽  
Boundary Shear ◽  
Room Temperature Ductility ◽  
Solid Solution Matrix ◽  
Nickel Base ◽  
Solution Matrix ◽  
Different Levels ◽  
Base Superalloy

Recently we have been investigating a class of nickel-base superalloys which possess substantial room temperature ductility. This improvement in ductility is directly related to improvements in grain boundary strength due to increased boundary cohesion through control of detrimental impurities and improved boundary shear strength by controlled grain boundary micros true tures.For these investigations an experimental nickel-base superalloy was doped with different levels of sulphur impurity. The micros tructure after a heat treatment of 1360°C for 2 hr, 1200°C for 16 hr consists of coherent precipitates of γ’ Ni3(Al,X) in a nickel solid solution matrix.

Hepatocyte Alterations in Guinea Pigs FED Polychlorinated Biphenyls (PCBs), Dibenzodioxins (PCDD), AND DIBENZOFURANS (PCDF)

1982 ◽  
Vol 40 ◽  
pp. 56-57
Author(s):  
J. N. Turner ◽  
D. N. Collins
Keyword(s):  
Guinea Pigs ◽  
Room Temperature ◽  
Dose Group ◽  
Methyl Cellulose ◽  
Uranyl Acetate ◽  
Target Organ ◽  
Office Building ◽  
Lead Citrate ◽  
Control Groups ◽  
Cooling Fluid

A fire involving an electric service transformer and its cooling fluid, a mixture of PCBs and chlorinated benzenes, contaminated an office building with a fine soot. Chemical analysis showed PCDDs and PCDFs including the highly toxic tetra isomers. Guinea pigs were chosen as an experimental animal to test the soot's toxicity because of their sensitivity to these compounds, and the liver was examined because it is a target organ. The soot was suspended in 0.75% methyl cellulose and administered in a single dose by gavage at levels of 1,10,100, and 500mgm soot/kgm body weight. Each dose group was composed of 6 males and 6 females. Control groups included 12 (6 male, 6 female) animals fed activated carbon in methyl cellulose, 6 males fed methyl cellulose, and 16 males and 10 females untreated. The guinea pigs were sacrificed at 42 days by suffocation in CO2. Liver samples were immediately immersed and minced in 2% gluteraldehyde in cacadylate buffer at pH 7.4 and 4°C. After overnight fixation, samples were postfixed in 1% OsO4 in cacodylate for 1 hr at room temperature, embedded in epon, sectioned and stained with uranyl acetate and lead citrate.

Domain Formation in Synthetic Quartz

1971 ◽  
Vol 29 ◽  
pp. 156-157
Author(s):  
Joseph J. Comer
Keyword(s):  
Electron Beam ◽  
Room Temperature ◽  
Domain Formation ◽  
Synthetic Quartz ◽  
Transmission Electron ◽  
Black Spots ◽  
Diffraction Mode ◽  
Domain Boundaries ◽  
Kikuchi Lines ◽  
Straight Lines

Domains visible by transmission electron microscopy, believed to be Dauphiné inversion twins, were found in some specimens of synthetic quartz heated to 680°C and cooled to room temperature. With the electron beam close to parallel to the [0001] direction the domain boundaries appeared as straight lines normal to <100> and <410> or <510> directions. In the selected area diffraction mode, a shift of the Kikuchi lines was observed when the electron beam was made to traverse the specimen across a boundary. This shift indicates a change in orientation which accounts for the visibility of the domain by diffraction contrast when the specimen is tilted. Upon exposure to a 100 KV electron beam with a flux of 5x 1018 electrons/cm2sec the boundaries are rapidly decorated by radiation damage centers appearing as black spots. Similar crystallographio boundaries were sometimes found in unannealed (0001) quartz damaged by electrons.

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