Bound pairs: Direct evidence for long-range attraction between like-charged colloids

B. V.R. Tata; P. S. Mohanty; M. C. Valsakumar

doi:10.1016/j.ssc.2008.06.026

Bound pairs: Direct evidence for long-range attraction between like-charged colloids

B. V.R. Tata, P. S. Mohanty, M. C. Valsakumar

Indira Gandhi Centre for Atomic Research

Research output: Contribution to journal › Article › peer-review

50 Citations (Scopus)

Abstract

We report observations of stable bound pairs in very dilute deionized aqueous suspensions of highly charged polystyrene colloidal particles, with monovalent counterions, using a confocal laser scanning microscope. Through an analysis of several thousands of time series of confocal images recorded deep inside the bulk suspension, we find that the measured pair-potential, U (r) has a long-range attractive component with well depths larger than the thermal energy. These observations provide direct and unequivocal evidence for the existence of long-range attraction in U (r) of like-charged colloidal particles.

Original language	English
Pages (from-to)	360-365
Number of pages	6
Journal	Solid State Communications
Volume	147
Issue number	9-10
DOIs	https://doi.org/10.1016/j.ssc.2008.06.026
Publication status	Published - Sept 2008
Externally published	Yes

Keywords

A. Colloidal dispersions
B. Polystyrene particles
C. Confocal laser scanning microscopy
D. Pair-potential

ASJC Scopus subject areas

General Chemistry
Condensed Matter Physics
Materials Chemistry

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10.1016/j.ssc.2008.06.026

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title = "Bound pairs: Direct evidence for long-range attraction between like-charged colloids",

abstract = "We report observations of stable bound pairs in very dilute deionized aqueous suspensions of highly charged polystyrene colloidal particles, with monovalent counterions, using a confocal laser scanning microscope. Through an analysis of several thousands of time series of confocal images recorded deep inside the bulk suspension, we find that the measured pair-potential, U (r) has a long-range attractive component with well depths larger than the thermal energy. These observations provide direct and unequivocal evidence for the existence of long-range attraction in U (r) of like-charged colloidal particles.",

keywords = "A. Colloidal dispersions, B. Polystyrene particles, C. Confocal laser scanning microscopy, D. Pair-potential",

author = "Tata, \{B. V.R.\} and Mohanty, \{P. S.\} and Valsakumar, \{M. C.\}",

year = "2008",

month = sep,

doi = "10.1016/j.ssc.2008.06.026",

language = "English",

volume = "147",

pages = "360--365",

journal = "Solid State Communications",

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TY - JOUR

T1 - Bound pairs

T2 - Direct evidence for long-range attraction between like-charged colloids

AU - Tata, B. V.R.

AU - Mohanty, P. S.

AU - Valsakumar, M. C.

PY - 2008/9

Y1 - 2008/9

N2 - We report observations of stable bound pairs in very dilute deionized aqueous suspensions of highly charged polystyrene colloidal particles, with monovalent counterions, using a confocal laser scanning microscope. Through an analysis of several thousands of time series of confocal images recorded deep inside the bulk suspension, we find that the measured pair-potential, U (r) has a long-range attractive component with well depths larger than the thermal energy. These observations provide direct and unequivocal evidence for the existence of long-range attraction in U (r) of like-charged colloidal particles.

AB - We report observations of stable bound pairs in very dilute deionized aqueous suspensions of highly charged polystyrene colloidal particles, with monovalent counterions, using a confocal laser scanning microscope. Through an analysis of several thousands of time series of confocal images recorded deep inside the bulk suspension, we find that the measured pair-potential, U (r) has a long-range attractive component with well depths larger than the thermal energy. These observations provide direct and unequivocal evidence for the existence of long-range attraction in U (r) of like-charged colloidal particles.

KW - A. Colloidal dispersions

KW - B. Polystyrene particles

KW - C. Confocal laser scanning microscopy

KW - D. Pair-potential

UR - https://www.scopus.com/pages/publications/48049089595

U2 - 10.1016/j.ssc.2008.06.026

DO - 10.1016/j.ssc.2008.06.026

M3 - Article

AN - SCOPUS:48049089595

SN - 0038-1098

VL - 147

SP - 360

EP - 365

JO - Solid State Communications

JF - Solid State Communications

IS - 9-10

ER -

Bound pairs: Direct evidence for long-range attraction between like-charged colloids

Abstract

Keywords

ASJC Scopus subject areas

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