Zhaoxia Qian

10 Questions 10 Answers 0 Followers

Questions related from Zhaoxia Qian

How to determine the concentration of polymer micelles?

I have some PNIPAM (Poly(N-isopropylacrylamide)) aqueous solution in which PNIPAM are crosslinked to form spherical microspheres. I want to know the concentration of these microspheres in...

09 September 2016 4,941 7 View

How to functionalize silver nanoparticles with thiolated PEG?

How to functionalize silver nanoparticles with thiolated PEG? I found a couple of papers doing this, but when I mix the Ag nanoparticles with thiolated PEG, the silver particles seem to be...

04 April 2016 8,565 4 View

How to prevent silver nanoparticles from dissolving in aqueous solution?

I am trying to do some electrochemical measurement of silver nanoparticles on ITO/glass substrate and noticed that the silver nanoparticles easily dissolve in solution and change morphology from...

04 April 2016 8,331 5 View

Why the current I get in chronoamperometry is negative?

I am doing some photochemical reaction on the electrode and monitor the current produced in this process by chronoamperometry. The potential I set in the working electrode is its potential...

03 March 2016 7,833 9 View

Why the laser intensity is so low in photothermal therapy?

I noticed that most literature doing photothermal therapy were using a laser power intensity of 10W/cm2 to 20W/cm2 and they reported a dramatic temperature increase as high as to 40oC which is...

01 January 2016 5,394 5 View

How do you make a nanoparticle monolayer?

I have some nanoparticles around 100 nm and I want to disperse them in ITO substrate evenly for plasmonic solar cell fabrication. I previously tried spin coating, but since my nanoparticles are...

04 April 2014 3,072 2 View

What's the measurement limit of dynamic light scattering?

I checked it online and the result I got is 1nm ~1micrometer. But does anyone know how reliable if I get result ranging 1~5 nm for nanoparticle samples? Thanks!

02 February 2014 5,496 16 View

How reliable is the reflective index of film obtained from ellipsometry?

I am measuring the thickness and reflective index of PEG film on Si wafer. I noticed that the reflective index the ellipsometry gave me (1.58) is much higher than what I expected (1.47). I was...

10 October 2013 9,797 1 View

How to separate nanoparticles of two different sizes?

I have a mixture of two types of nanoparticles, one is a cubic with an edge length of 20 nm, the other is a bipyramid 80nm *20 nm. Both of them are very monodispersed both in size and shape. They...

08 August 2013 4,098 26 View

How do I do EDS quantification?

I have a nanomaterial that contains gold, silver and chloride and I want to do EDS to quantify their relative content. I need something to determine the k factor between these three elements. I'm...

08 August 2013 2,441 4 View