Akanksha Adaval

12 Questions 60 Answers 0 Followers

Questions related from Akanksha Adaval

Decreasing of dielectric constant as filler loading increases in polymer. Why?

I am working on a project to study the piezoelectric property of a polymer matrix by incorporating ceramic material. While studying the dielectric properties, I see a continuous decrease as the...

10 April 2024 1,517 5 View

Curie temperature of PVDF?

In majority of studies, the curie temperature of pure PVDF has not been explored. The studies which are available they have worked on PVDF copolymers to study the curie temperature via dielectric...

04 December 2023 3,657 2 View

Once stretching condition is removed then why beta phase doesn't go back to alpha phase in PVDF?

We know that uniaxial and biaxial stretching induces the formation of beta/gamma phase in PVDF. So, once the stretching condition is removed then why doesn't the phase go back to its most stable...

01 December 2022 7,020 1 View

What is the difference between RAMAN and FTIR spectra?

I have come across studies which have mentioned Raman and FTIR to be complementary. So, why are some bands present in FTIR but are absent in Raman or vice-versa.

13 June 2022 6,953 5 View

Which crystalline phase of PVDF has highest/lowest permittivity and why?

PVDF-based dielectric polymers and their applications in ele... This particular paper mentions that alphas has highest permittivity but the reason is not clear for the same. Can anyone help me in...

11 March 2022 6,547 0 View

Is there any difference between the piezoelectric coefficient values expressed in pm/V and pC/N?

I need to clarify that is 1 pm/V = 1pC/N? Why there are two units? Are the methods to measure the piezoelectric coefficient in the two units, different? Kindly help! Thank you.

09 March 2022 9,466 9 View

What is the difference in Phase vs. voltage curves, during PFM, when sample biased as opposed to tip biased?

While carrying out PFM for my polymer films, I observed that while taking butterfly curves and phase plots; if during analysis it is sample biased and tip biased we are getting a marginal...

10 January 2022 8,525 10 View

How do we index a SAED pattern? Can we get information about no. of graphene layers from this pattern?

I have attached two SAED patterns for graphene based nanofillers. Can anyone guide me through the indexing of the said patterns? And also, is it possible to find out the number of graphene layers...

06 August 2021 4,552 8 View

Decrease in Onset of Degradation Temperature in PVDF/Filler Composites as compared to pure PVDF. Why?

I am observing a decrease in the filler incorporated PVDF composites as compared to pure PVDF. This means that the thermal stability is decreasing. Even though the polar phase formation is...

05 March 2021 565 3 View

What is the difference between Graphene Oxide and Expanded Graphite?

What are the main differences between Graphene Oxide and Expanded graphite, in terms of surface functionalities, conductivity, d-spacing and other features? Is the term expanded graphite...

07 February 2021 10,139 4 View

What is the optimum sample thickness for calculating d33 through AFM?

I have polymer composite film samples. The thickness of my sample is around 1.5 mm. While calculating piezo-coefficient via AFM, there is no response. Can anyone let me know the optimum sample...

15 December 2020 4,003 10 View

Is there a way to compare the crystallinity of different PVDF phases?

As its known that PVDF has 5 crystalline phases. Is the relative crystallinity of all the phases same or different. Is there some study published on it yet? or this is just an absurd question...

01 January 1970 1,334 6 View