24 Questions 33 Answers 0 Followers
Questions related from Purvi Kikani
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 1,488 5 View
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 8,137 2 View
I want to understand a process of interaction between atomic oxygen species (777 nm and 845 nm) from oxygen plasma and polymeric surface. Why atomic oxygen species are considered to be the most...
06 June 2022 7,004 2 View
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 761 2 View
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 5,445 4 View
Low pressure oxygen plasma treatment of LDPE film results in significant morphological changes. I want to understand what is the exact process which leads to morphological changes. Is it due to...
15 June 2021 7,346 3 View
According to the Baier minima, surfaces having critical surface tensions between 20-30 mN/m are considered as foul release surfaces. PDMS or silicone material falls under this range according to...
11 December 2020 3,611 2 View
I have done oxygen plasma treatment on PDMS material and got bonded and free C=O functional groups at 1635 and 1730 cm-1 respectively in FT-IR spectra. I kept the samples in ambient environment...
11 February 2020 652 0 View
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 2,806 8 View
There are three major equations in MHD plasma such as momentum equation, continuity equation and energy equation. What is the physical significance or a description of energy equation in that ?
21 February 2019 8,939 4 View
During my plasma treatment I observe increase in surface temperature on powered and grounded electrode in CCP-RF low pressure configuration. At increased RF power, temperature of powered...
01 September 2018 4,939 3 View
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 2,325 4 View
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 2,080 4 View
I have read somewhere that 1. if the time scales of the phenomena to be observed are larger than the times scales of plasma oscillation and 2. spatial length scales are larger than the debye...
29 April 2018 9,339 7 View
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 2,710 2 View
In some conditions we take average K.E. if electron in plasma as 1/2 KT and sometimes we take just 'KT'. When should we consider what and why ? Thank you in advance, Purvi Dave
09 January 2018 3,686 6 View
when we study plasma waves (plasma oscillations, electron waves and ion waves) we study perturbation in density, velocity and electric field and use momentum, continuity and poison equation to...
09 January 2018 4,561 5 View
what is the origin and significance of writing imaginary term exp i(kx-wt) in the wave equation ?
03 January 2018 4,920 11 View
Compared to other polymers like PET, PP etc. LDPE has very poor oxygen diffusion barrier properties. Enhancement of barrier properties in the case of PET / PP is very good just by surface...
22 February 2017 7,528 4 View
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 3,913 8 View
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 3,317 5 View
I am functionalizing polymer surface with oxidative plasma. Initially water contact angle reduces with plasma treatment time. After that it increases partially and again reduces a bit. Want to...
23 April 2015 6,405 25 View
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 6,202 2 View
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 2,076 5 View
