Marius Ciobanu

12 Questions 21 Answers 0 Followers

Questions related from Marius Ciobanu

How to prepare crack-free antimony-dopped tin oxide (ATO) films?

I want to prepare ATO transparent, conductive films using doctor blade method on transparent conductive substrates. For this porpose I use an aqueous ATO colloidal solution containing 15-30% (wt)...

06 June 2017 1,134 5 View

Which type of LC texture does the polarized light micrograph in the attachment corresponds to?

The polarized-light micrograph in the attachment corresponds to an ionic liquid crystal material based on ion pairing of dicationic 4,4' bipyridinium capping two thymine groups with amphiphilic...

07 July 2014 2,219 9 View

What are the factors affecting electrochemical reduction of "viologen" in a solution?

There are several factors affecting the reduction of dicationic 4,4'-bipyridinium derivatives ("viologens") such: solvent, charge transfer interactions, substituents at the nitrogen atoms, counter...

04 April 2014 7,335 1 View

Is adenine thermal stable below melting point?

The only information available for me is that adenine has a melting point of 360°C. Any one known examples of adenine containing derivatives that undergo thermal decomposition or thermal-induced...

02 February 2014 308 1 View

What cause the fluctuation of the absorption over the time in fixed-wavelength UV-VIS spectroscopy?

I performed typical temperature-dependent UV-VIS measurements at a fixed wavelength (260 nm) of a DNA probe (Tm experiments). For the samples very diluted the absorbance does not remain constant...

01 January 2014 1,247 6 View

What causes the diminishing signal of the "orto-protons" of paraquat in 1H-NMR?

The 1H-NMR spectra of the paraquat (1,1'-Dimethyl-4,4'-bipyridinium dichloride) in D2O is characterized by 2 doublets pecks in aromatic region: at 9.12 ppm, called "orto-protons" and respectively...

10 October 2013 1,367 6 View

How to avoid a broad signal in H-NMR spectra due to self-aggregation between analyte molecules?

How can I avoid signal peak broadening in H-NMR spectra due to self-aggregation of molecules in deuterated low-polar solvents (such CDCl3 or THF-d8)? This self-aggregation is due to H-Bond formed...

05 May 2013 5,569 34 View

It is accepted to publish Elem. Analysis of compounds containing hygroscopic water traces?

I performed synthesis of a new sulfonic compound with very good spectroscopic integrity but with a small trace of hygroscopic water (less then 2%). This content of water influenced the Carbon...

05 May 2013 5,453 4 View

How to correct Cyclic Voltammetry data for iR drop post-measurement?

I run Cyclic Voltammetry in low-polar solvent such as THF. The high resistance of this electrolyte causes a significant iR drop with effect on the cyclic voltammograms. My question is, can I...

05 May 2013 6,416 21 View

Can I use glassy carbon as a working electrode to study an analyte in suspension?

I am trying to perform cyclic voltammetry of a suspension of Carbon Black Particles (CB) in aqueous electrolyte solution. My goal is to make an analytical study of redox functional groups existing...

03 March 2013 1,672 24 View

Can a Menschutkin reaction in water or alcohol/water mixture as a solvent be performed?

I perform a reaction of a 4,4'-bipyridine N-monosubstituted derivative with an alkyl-bromide substrate (Menschutkin type reaction). For more details see the attached file. The reaction works in...

01 January 2013 1,656 10 View

How to calculate the active surface area of mesoporous TiO2 film?

I’m working with surface modified electrodes based on TiO2 mesoporous film coated on transparent FTO-Glass with a thickness of about 4 um.

07 July 2012 5,450 14 View