Purvi Kikani

13 Questions 20 Answers 0 Followers

Questions related from Purvi Kikani

My plasma treated polymeric surface is able to reduce adhesion of gram negative bacterial cells but allows adhesion of gram positive cells, why?

I have observed opposite response from gram negative and gram positive bacterial cells on plasma modified polymeric surface in terms of adhesion and biofilm formation. gram negative cells show...

20 April 2023 1,479 5 View

What is the contribution of negative oxygen ions present in low pressure oxygen plasma in terms of surface modification ?

As we know oxygen rf plasma is rich in terms of O(-) ion density. I want to understand how / what way these negative ions contribute to surface modification of substrate kept on powered electrode....

28 August 2022 8,094 2 View

What is the term ' average profile wavelength' in AFM analysis ?

In AFM analysis under hybrid parameters there is a term called average profile wavelength which involves both amplitude and space parameters. I am unable to understand the physical significance...

11 February 2022 746 2 View

This is an image of E-coli cells. Are these healthy or dead ones as I see some rupturing at the end of each cell?

On some E coli cells, I see some opening of cell wall as shown in this image. Please guide what is it and why such things happen i.e. under what kind of conditions ?

07 December 2021 5,435 4 View

Why and from where fibrinogen gets deposited on catheter when inserted into bladder ?

When catheter is inserted in to the bladder, fibrinogen gets deposited on to catheter surface and that becomes favorable site for bacteria to grow. I want to understand from where and why (due...

24 June 2019 2,797 8 View

Can someone explain me the equlivalent circuit of CCP-RF configuration ?

I am unable to understand the origin of components of CC P-RF sheath equivalent circuit components (resistor, capacitor and diode) and that of bulk plasma (resistor and inductor). I am not...

14 August 2018 2,317 4 View

How driving frequency affects plasma surface activation of polymers in CCP RF configuration ?

What exactly changes when we use 40 KHz, 13.56 MHz or 2.4 GHz plasma source for plasma surface activation of polymers at low pressure in CCP-RF type plasma ? Why 40 KHz gives better results...

06 August 2018 2,060 4 View

Can somebody explain what is isothermal and what is adiabatic compression in case of electron and ion waves in plasma ?

In case of electron plasma waves we consider adiabatic compression and take gamma equal to 3 [using equation (2+N)/N]. what do we mean by adiabatic compression here?I mean physical significance....

09 January 2018 2,692 2 View

Why do we write an imaginary term in any simple harmonic motion / wave equation such as exp i(kx-wt) ? what is the origin and physical significance ?

what is the origin and significance of writing imaginary term exp i(kx-wt) in the wave equation ?

03 January 2018 4,902 11 View

How to interpreat SiOx film structures (liner, network or cage like) deposited by plasma cvd from FTIR and HRSEM Images ??

I am depositing SiOx films using HMDSO / Oxygen gas mixture by low pressure RF PECVD method. In FTIR spectra I get two overlapped peaks around 1050 cm-1 and 1135 cm-1. Does this have any relation...

23 October 2015 3,893 8 View

Can someboy help me to understand wetting of Polymer surface ?

I am giving a plasma treatment to polyethylene (PE) surface. Wetting time (time taken to completely wet the PE surface) on plasma treated polymer surface changes as a function of one of my...

23 April 2015 3,306 5 View

How can we understand plasma dynamics in the PECVD coating process?

I want to understand the effect of plasma parameters on coating characteristics for deposition of SiOx and SiOxNy thin films using the PECVD method.

29 May 2014 6,179 2 View

How does thickness of the gas diffusion layer (coating of SiOx deposited on Polyethylene) play a role in determining gas transmission rate ?

I want to understand how gas transmission rate is dependent on the thickness of the diffusion barrier coating deposited on a polymer substrate. Why is the preferred thickness of the diffusion...

23 April 2014 2,066 5 View