Home >
Community >
What does it mean if the zeta potential value is positive?
Upvote
23
Downvote
+ Nano metal oxides
+ Surface chemistry
+ Nanotechnology
+ Zeta potential
+ Colloid chemistry
Posted by
Kevin Cottrell
What does it mean if the zeta potential value is positive?
Dear all,
When I am trying to perform zeta analysis in chloroform using glass cuvette (for organic charged microparticles), the results what I am getting is flucuating from +ve to -ve and vice versa. Although I am changing the default value e.g viscosity, dielectric constant same as for chloroform at 30 oC. Can anyone tell me how to do it properly.
When I am trying to perform zeta analysis in chloroform using glass cuvette (for organic charged microparticles), the results what I am getting is flucuating from +ve to -ve and vice versa. Although I am changing the default value e.g viscosity, dielectric constant same as for chloroform at 30 oC. Can anyone tell me how to do it properly.
The zeta potential is a key indicator of the stability of colloidal dispersions. ... So, colloids with high zeta potential(negative or positive) are electrically stabilized while colloids with low zeta potentials tend to coagulate or flocculate.
The zeta potential is a key indicator of the stability of colloidal dispersions. ... So, colloids with high zeta potential(negative or positive) are electrically stabilized while colloids with low zeta potentials tend to coagulate or flocculate.
Anup Kumar Singh You need conductivity in the continuous phase in order to get particles to move correctly in the applied electrical field. What you appear to be observing is called polarization of the electrodes - which is distortion of the field. It's nothing to do with the constants that you put into the software. I would ask you what benefit you see in measuring the 'zeta potential' in a non-conductive medium. Even if the value was correctly measured, then what would it mean, in your opinion? Usually, in non-conductive media, size and density play the most important role in determining if settling/sedimentation will occur.
Anup Kumar Singh You need conductivity in the continuous phase in order to get particles to move correctly in the applied electrical field. What you appear to be observing is called polarization of the electrodes - which is distortion of the field. It's nothing to do with the constants that you put into the software. I would ask you what benefit you see in measuring the 'zeta potential' in a non-conductive medium. Even if the value was correctly measured, then what would it mean, in your opinion? Usually, in non-conductive media, size and density play the most important role in determining if settling/sedimentation will occur.
Dear Tahir, It is possible for a particle with cationic functional group to have negative zeta potential in basic pH, because in basic pH, the no. of hydroxyl groups (OH- ions)are more in the medium which leads the surface to be negatively charged. Therefore the zeta potential is negative at higher pH.
Dear Tahir, It is possible for a particle with cationic functional group to have negative zeta potential in basic pH, because in basic pH, the no. of hydroxyl groups (OH- ions)are more in the medium which leads the surface to be negatively charged. Therefore the zeta potential is negative at higher pH.
Hi, dear Minitha C R, It is so nice could to help you with your questions. I am attaching you a first document you should read in order to get the initial knowing about these thems. Greetings from Prof.Dr.OLSM
Hi, dear Minitha C R, It is so nice could to help you with your questions. I am attaching you a first document you should read in order to get the initial knowing about these thems. Greetings from Prof.Dr.OLSM
Nanoparticles with a zeta potential between −10 and +10 mV are considered approximately neutral, while nanoparticles with zeta potentials greater than +30 mV or less than −30 mV are considered strongly cationic and strongly anionic, respectively.
Nanoparticles with a zeta potential between −10 and +10 mV are considered approximately neutral, while nanoparticles with zeta potentials greater than +30 mV or less than −30 mV are considered strongly cationic and strongly anionic, respectively.
Alan F Rawle A conducting continuous phase is only required for instruments that use a current source to generate the electric field. Instruments using a voltage source do not have that requirement. Regarding polarization, this is an issue in high conductivity liquids.
Alan F Rawle A conducting continuous phase is only required for instruments that use a current source to generate the electric field. Instruments using a voltage source do not have that requirement. Regarding polarization, this is an issue in high conductivity liquids.
It means that on the surface your nanoparticles has a net positive charge and so you your nanoparticles have superficial groups with positive charge. And when your nanoparticle has a great absolut value (<-30mv or >30mv) the zeta potentil indicate that your particle form stable suspention on water.
It means that on the surface your nanoparticles has a net positive charge and so you your nanoparticles have superficial groups with positive charge. And when your nanoparticle has a great absolut value (<-30mv or >30mv) the zeta potentil indicate that your particle form stable suspention on water.
Dear all,
When I am trying to perform zeta analysis in chloroform using glass cuvette (for organic charged microparticles), the results what I am getting is flucuating from +ve to -ve and vice versa. Although I am changing the default value e.g viscosity, dielectric constant same as for chloroform at 30 oC. Can anyone tell me how to do it properly.
With warm regards
Dear all,
When I am trying to perform zeta analysis in chloroform using glass cuvette (for organic charged microparticles), the results what I am getting is flucuating from +ve to -ve and vice versa. Although I am changing the default value e.g viscosity, dielectric constant same as for chloroform at 30 oC. Can anyone tell me how to do it properly.
With warm regards
More
VOTE
The zeta potential is a key indicator of the stability of colloidal dispersions. ... So, colloids with high zeta potential(negative or positive) are electrically stabilized while colloids with low zeta potentials tend to coagulate or flocculate.
The zeta potential is a key indicator of the stability of colloidal dispersions. ... So, colloids with high zeta potential(negative or positive) are electrically stabilized while colloids with low zeta potentials tend to coagulate or flocculate.
More
VOTE
Anup Kumar Singh You need conductivity in the continuous phase in order to get particles to move correctly in the applied electrical field. What you appear to be observing is called polarization of the electrodes - which is distortion of the field. It's nothing to do with the constants that you put into the software. I would ask you what benefit you see in measuring the 'zeta potential' in a non-conductive medium. Even if the value was correctly measured, then what would it mean, in your opinion? Usually, in non-conductive media, size and density play the most important role in determining if settling/sedimentation will occur.
Anup Kumar Singh You need conductivity in the continuous phase in order to get particles to move correctly in the applied electrical field. What you appear to be observing is called polarization of the electrodes - which is distortion of the field. It's nothing to do with the constants that you put into the software. I would ask you what benefit you see in measuring the 'zeta potential' in a non-conductive medium. Even if the value was correctly measured, then what would it mean, in your opinion? Usually, in non-conductive media, size and density play the most important role in determining if settling/sedimentation will occur.
More
VOTE
Good question. Thank you for raising this question.
Thanks
Good question. Thank you for raising this question.
Thanks
More
VOTE
Dear Tahir,
It is possible for a particle with cationic functional group to have negative zeta potential in basic pH, because in basic pH, the no. of hydroxyl groups (OH- ions)are more in the medium which leads the surface to be negatively charged. Therefore the zeta potential is negative at higher pH.
Thanks.
Dear Tahir,
It is possible for a particle with cationic functional group to have negative zeta potential in basic pH, because in basic pH, the no. of hydroxyl groups (OH- ions)are more in the medium which leads the surface to be negatively charged. Therefore the zeta potential is negative at higher pH.
Thanks.
More
VOTE
Hi, dear Minitha C R,
It is so nice could to help you with your questions.
I am attaching you a first document you should read in order to get the initial knowing about these thems.
Greetings from Prof.Dr.OLSM
Hi, dear Minitha C R,
It is so nice could to help you with your questions.
I am attaching you a first document you should read in order to get the initial knowing about these thems.
Greetings from Prof.Dr.OLSM
More
VOTE
this question. and answers is helped me in my project.
thank you
this question. and answers is helped me in my project.
thank you
More
VOTE
Anup Kumar Singh even after using Dip cell too.
Anup Kumar Singh even after using Dip cell too.
More
VOTE
Nanoparticles with a zeta potential between −10 and +10 mV are considered approximately neutral, while nanoparticles with zeta potentials greater than +30 mV or less than −30 mV are considered strongly cationic and strongly anionic, respectively.
Nanoparticles with a zeta potential between −10 and +10 mV are considered approximately neutral, while nanoparticles with zeta potentials greater than +30 mV or less than −30 mV are considered strongly cationic and strongly anionic, respectively.
More
VOTE
Alan F Rawle A conducting continuous phase is only required for instruments that use a current source to generate the electric field. Instruments using a voltage source do not have that requirement. Regarding polarization, this is an issue in high conductivity liquids.
Alan F Rawle A conducting continuous phase is only required for instruments that use a current source to generate the electric field. Instruments using a voltage source do not have that requirement. Regarding polarization, this is an issue in high conductivity liquids.
More
VOTE
It means that on the surface your nanoparticles has a net positive charge and so you your nanoparticles have superficial groups with positive charge. And when your nanoparticle has a great absolut value (<-30mv or >30mv) the zeta potentil indicate that your particle form stable suspention on water.
It means that on the surface your nanoparticles has a net positive charge and so you your nanoparticles have superficial groups with positive charge. And when your nanoparticle has a great absolut value (<-30mv or >30mv) the zeta potentil indicate that your particle form stable suspention on water.
More
VOTE