Wyniki wyszukiwania - BazTech

1

Carbon nanotubes functionalized by salts containing stereogenic heteroatoms as electrodes in their battery cells

Zdanowska S., Pyzalska M., Drabowicz J., Kulawik D., Pavlyuk V., Girek T., Ciesielski W.

Polish Journal of Chemical Technology

|

2016

|

Vol. 18, nr 4

22--26

EN

This paper concentrates on electrochemical properties of groups of multi-walled carbon nanotubes (MWCNT) functionalized with substituents containing a stereogenic heteroatom bonded covalently to the surface of the carbon nanotube. This system was tested in Swagelok-type cells. The cells comprised a system (functionalized CNT with salts containing S and P atoms) with a working electrode, microfiber separators soaked with electrolyte solution, and a lithium foil counter/reference (commercial LiCoO2 ) electrode. The electrolyte solution was 1 M LiPF6 in propylene carbonate. Using standard techniques (cyclic voltammetry/chronopotentiometry), galvanostatic cycling was performed on the cells at room temperature with a CH Instruments Model 600E potentiostat/galvanostat electrochemical measurements. Methods of functionalization CNT were compared in terms of the electrochemical properties of the studied systems. In all systems, the process of charge/discharge was observed.

2

Zastosowanie promieniowania mikrofalowego w reakcji bromowania bis-pirazolo[3,4-b;4'-3'-e]pirydyn

Marcinkowska M., Puchała A., Rasała D.

Aparatura Badawcza i Dydaktyczna

|

2010

|

T. 15, nr 4

109-115

PL

Opisano wpływ promieniowania mikrofalowego na przebieg reakcji bromowania wybranych bis-pirazolo[3,4-b; 4',3'-e]pirydyn przy użyciu promieniowania mikrofalowego. Uzyskane wyniki porównano z reakcjami przeprowadzonymi w warunkach klasycznych.

EN

The bromination reaction of several bis-pirazolo[3,4-b;4',3'-e]pyridines under microwave irradiation are described. The results were compared with analogous reactions conducted under classical conditions.

3

Removal of Water - a Factor Influencing the Synthesis of Alkynes in a Phase-Transfer Catalyzed - beta - Elimination Reaction

Zakrzewski J., Huras B., Sas A., Żelechowski K., Bombińska D.

Polish Journal of Chemistry

|

2008

|

Vol. 82, nr 5

1051-1057

EN

Acetylene derivatives 4 were synthesized from the corresponding vicinal bromo compounds 2 in the phase-transfer catalyzed hydrogen bromide - beta elimination reaction using solid potassium hydroxide as a base, xylene as a solvent, and a phase-transfer catalyst. The yields of the synthesized acetylene derivatives 4 were substantially improved when water formed in the process had been removed.

4

Microwave-sssisted preparation and thermal properties of polymethacrylates with brominated carbazolyl pendant groups

Bogdał D., Pielichowski J., Pielichowski K., Warzała M., Łukasiewicz M.

Polimery

|

2000

|

T. 45, nr 5

363-365

EN

A series of polymethacrylates containing brominated carbazolyl pendant groups was obtained by using microwave irradiation in the synthesis of monomers.

PL

Otrzymano sirię polimetakrylanów zawierających bromowe grupy karbazolilowe w łańcuchach bocznych, wykorzystując reakcje przebiegające w warunkach promieniowania mikrofalowego w trakcie syntez monomerów.

5

Bromination of alfa-tocopherol acetate

Witkowski S., Wałejko P.

Bulletin of the Polish Academy of Sciences. Chemistry

|

1998

|

Vol. 46, No. 4

349-352

EN

Selective bromination of alfa-tocopherol acetate with bromine in the presence of HgO (Br2O in situ) to 5-bromomethyl-gama-tocopherol acetate was carried out. Bromination of alfa-tocopherol acetate with NBS led to 3,4-dehydro-alfa-tocopherol acetate. No basic catalyst for dehydrobromination of intermediate 4-bromo derivative was needed.