Jason Ju

19 Questions 17 Answers 0 Followers

Questions related from Jason Ju

Which books would be recommended for solvent selection?

Hi, I'm wondering which reference books would be believable? I deal with copolymer so that I sometimes need to selectively remove only one phase. It seems like that I cannot avoid to select...

11 November 2018 6,724 0 View

How can target molecular weight of RAFT reaction depend on CTA instead of Initiator?

I've studied and read the principle of RAFT and its mechanism. By being fragmented and added, the rate of polymerization gets slow under the equilibrium between active and dormant species. But,...

10 October 2018 8,541 0 View

How can target molecular weight of RAFT reaction depend on CTA instead of Initiator?

I've studied and read the principle of RAFT and its mechanism. By being fragmented and added, the rate of polymerization gets slow under the equilibrium between active and dormant species. But,...

10 October 2018 3,946 0 View

What kind of solvents would be promising if I want to selectively dissolve PS out of PS-PMMA??

Hi, I wonder a specific solvent that can dissolve only PS out of PS-PMMA. Of course, solubility depends on molecular weight of polymer, but if it can be excluded for an ideal situation, I take...

10 October 2018 4,469 4 View

Hydrolysis stability between urethane and ester in base condition?

Hello, finally I am asking you some questions about the hydrolysis stability between urethane and ester groups. Let me clarify my question. I would like to compare hydrolysis stability among...

02 February 2018 1,891 0 View

Can you let me know the relationship b/w crystallinity and shift in XRD, Raman, FT-IR and others?

First, really thank you for reading my question. Like I said, I really wonder what kind of relationships b/w shift and crystallinity of some substances in those intruments. Please, answer me if...

10 October 2016 9,162 3 View

Why are Fe3O4 particles differently affected by cyclic voltammetry and galvanostic charge discharge cycles?

Firstly, thank you for openning my question. These days, I'm measuring capacitive behavior of Fe3O4 and Fe3O4-modified electrolytes. As people say, metal oxides are senstive to bulk expansion...

10 October 2016 8,742 2 View

Why only a half (discharge) is used in calculation of specific capacitance?

To begin with, thank for being here to answer me. My question is 1. why is only a half (discharge part in galvanostatic charge-discharge measurement) is used when we calcaulte specific...

10 October 2016 6,693 2 View

Can you let me know how to calculate wave impedence?

I added the equation about it here.I'm stopped since I failed to calculate wave impedence.Especially, relative permittivity and relative permeability are big obstacles for me to solve.What I'd...

09 September 2016 2,230 2 View

Can you let me know how to calculate wave impedence?

I added the equation about it here. I'm stopped since I failed to calculate wave impedence. Especially, relative permittivity and relative permeability are big obstacles for me to solve. What I'd...

09 September 2016 6,925 2 View

Is it possible for permittivity and permeability of a material to be able to a minus value (less than zero) ?

I'm dealing with electromagnetic wave shielding materials and have just measured its permittivity and permeability. However, values of them are sometiems minus. Can you let me know it is...

08 August 2016 5,542 5 View

Why isn't it working to increase voltage above 1 V in galvano setting of EC lab?

Hello, I'm a student studying supercapacitor and using EC lab for measuring electrochemical reactions. I have a queation 'why isn't voltage window above 1 V in galvano setting of EC lab ?' A...

07 July 2016 1,471 4 View

What should I take care of to use methane gas and ammonia gas in a furnace at a high temperature of 900 ℃?

Thank you for reading my question. I'm going to synthesize carbon layers by CVD and methane is the one I want to handle for the source of carbon. My plan is to make it continuously flow in a...

06 June 2016 9,125 3 View

Is there any TEM grid without carbon?

Thank you for reading my question. I'm looking at a TEM-grid without C-component since I'd like to get a microscopic image showing C-layers over metal oxide. When I try to differentiate C layer...

06 June 2016 610 6 View

Can I know the exact mechanism by which metal precursor is coated on reduced graphene oxide reduced from graphene oxide??

as far as I'm concerned, graphene oxide(GO) is usually utilized for metal coating. if we suppose that iron precursor such as iron chloride is coated on reduced graphene oxide during which GO is...

04 April 2016 9,675 4 View

Can you explain averge thickness of graphite and graphene nanoplatelet(GNP) or the range of their thicknesses??

Firstly, thank you for reading my question. I'm very confused when I differentiate thicknesses of graphite and GNP and I'd like to know the standard of their thicknesses to classify...

03 March 2016 3,666 4 View

Can you explain the reason acid with a long chain carbon is stronger than that with a short carbon chain when they have the same functional group?

In the case of carboxylic group, why is decanoic acid (the number of carbon : 10) is stronger than octanoic acid (8) in acidity ? I think I can figure out why roughly. But, I know I do not know as...

03 March 2016 6,250 8 View

Is a filter paper affected by pH ?

Hello, I'm really curious about if filter papers are affected or damaged by stronglyl acidic solution. I'm handling GO usually. In the process of making GO, I usually use a centrifugation to...

09 September 2015 4,002 6 View

How can I differentiate the degree of exfoliation of Graphite during the process of making Graphene Oxide?

I just made Graphene Oxide(GO) by modified Hummer's method and then tried to coat magnetic materials on it changing GO into RGO. Yet, the result was awful that the magnetization of the final...

04 April 2015 8,748 3 View