Daragh Rice

9 Questions 15 Answers 0 Followers

Questions related from Daragh Rice

Could glycine and gluteraldehyde be used to form carboxylic acid groups on an amine functionalised surface?

Hi All, I have SERS microspheres, they're silica coated and I've used APTES to functionalise the surface. I'm aware that the amine can be converted to carboxyl via succinic anyhdride, this takes...

26 March 2018 2,351 3 View

Can low concentrations in SERS have a larger intensity?

I have been synthesising Ag nanoparticle films on Silica beads, I wished to show the limit of detection by making a concentration serial dilution of Rhodamine 6 G, however, there was strange...

22 March 2018 8,262 2 View

How to remove aggregates from Microsphere preparations?

I've got microspheres at approx 1.5µm diameter, these undergo several coating steps, one step is to coat with silver and another with polyelectrolytes. These steps cause aggregation and I'm left...

06 October 2016 8,294 3 View

Can DLS or a Zeta Sizer be used to get particle concentration?

We have magnetite spheres that are polystyrene coated and I wish to get analysis that tells me the concentration before and after magnetic recovery. Can the above mentioned techniques work?

18 February 2016 2,310 6 View

What is the bond energy of both Amine-Silver and Thiol-Silver?

In the formation of SAMs. thiols, amines and carboxylic acids can bind to noble metals. I have formed self assembled monolayers of both thiol and amine compounds, but can't seem to find any...

10 December 2015 2,299 4 View

What are the reasons for not seeing ν(CC) and δ(CH) stretches in a biphenyl molecule in Raman Analysis?

Hi, I've been analysing thiols on Silver particles using Raman, in 4-Aminothiophenol I see peaks at 1435 and 1143 cm-1 for ν(CC) and δ(CH) stretches, but when I analyse...

02 September 2015 8,325 3 View

Is there any analytical technique to tell if a protein is covalently bonded rather than just Physisorbed?

I have Amine functionalised Beads that I used to attach YFP by crosslinking with Gluteraldehyde. What I'm wondering is, if there is any way that the covalent attachment can be confirmed so...

10 August 2015 6,786 5 View

How can I convert silica surface hydroxyl groups to carboxyl groups?

I have a silica microsphere, and I wish to use EDC/NHS to couple a diamine spacer arm, but was told that the hydroxyl group itself wouldn't be reactive enough, so if I convert it to carboxyl, I'm...

30 April 2015 1,271 8 View

What is the mechanism of electroless plating of SIlver on a Silica surface?

A Silver shell can be reduced from silver nitrate onto a negatively charged surface using Butlyamine, what I'd like to know is exactly what's happening in the reaction. Thanks in advance for...

27 April 2015 4,038 1 View