[Todos] Fwd: CHARLA IFLYSIB VIRTUAL - Viernes 29/4/2022 10:30 hs - Self-assembly in mixtures with competing interactions

Lun Abr 25 12:51:16 -03 2022

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Secretaría Departamental de Física
secre2 en fisica.unlp.edu.ar
Cecilia Cafiero / Alejandro Chiquino
Facultad de Ciencias Exactas
Universidad Nacional de La Plata
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-------- Mensaje original -------- 

 		ASUNTO:
 		[Todos] CHARLA IFLYSIB VIRTUAL - Viernes 29/4/2022 10:30 hs -
Self-assembly in mixtures with competing interactions

 		FECHA:
 		2022-04-25 12:00

 		REMITENTE:
 		Charlas IFLYSIB <charlas.iflysib en gmail.com>

 		DESTINATARIO:
 		Charlas Iflysib <charlas-iflysib en googlegroups.com>

DADA LA SITUACIÓN ACTUAL EN RELACIÓN AL COVID-19, EL IFLYSIB REALIZA SUS
SEMINARIOS EN FORMATO VIRTUAL. PARA ELLO, INVITAMOS A LA COMUNIDAD A
PARTICIPAR A TRAVÉS DEL LINK https://utn.zoom.us/j/89038134365 

PARA ACCEDER AL ESPACIO VIRTUAL, LES PEDIMOS QUE SE IDENTIFIQUEN CON SU
NOMBRE A PARTIR DE 10:20HS. 

CHARLA IFLYSIB VIRTUAL 
VIERNES 29/4/2022, 10:30HS.  
LINK: HTTPS://UTN.ZOOM.US/J/89038134365 [1] 

TÍTULO:   
SELF-ASSEMBLY IN MIXTURES WITH COMPETING INTERACTIONS 

EXPOSITOR:

Alina Ciach 

INSTITUTE OF PHYSICAL CHEMISTRY OF THE POLISH ACADEMY OF SCIENCES
(WARSAW, POLAND) 

RESUMEN: 
A BINARY MIXTURE OF PARTICLES INTERACTING WITH SPHERICALLY-SYMMETRICAL
POTENTIALS LEADING TO MICROSEGREGATION IS STUDIED BY THEORY AND
MOLECULAR DYNAMICS (MD) SIMULATIONS. WE CONSIDER SPHERICAL PARTICLES
WITH EQUAL DIAMETERS AND VOLUME FRACTIONS. MOTIVATED BY THE MIXTURE OF
OPPOSITELY CHARGED PARTICLES WITH DIFFERENT ADSORPTION PREFERENCES
IMMERSED IN A NEAR-CRITICAL BINARY SOLVENT, WE ASSUME SHORT-RANGE
ATTRACTION LONG-RANGE REPULSION FOR THE INTERACTION BETWEEN LIKE
PARTICLES AND SHORT-RANGE REPULSION LONG-RANGE ATTRACTION FOR THE
INTERACTION BETWEEN DIFFERENT ONES. BOTH THEORY AND MD SIMULATIONS SHOW
COEXISTENCE OF A LOW-DENSITY DISORDERED PHASE WITH A HIGH-DENSITY PHASE
WITH ALTERNATING LAYERS RICH IN THE FIRST AND SECOND COMPONENTS. IN
THESE LAYERS, CRYSTALLINE STRUCTURE IS PRESENT IN THE SOLID AND ABSENT
IN THE LIQUID CRYSTALS THAT ARE STABLE AT LOWER AND HIGHER TEMPERATURE,
RESPECTIVELY. AT THE PHASE COEXISTENCE OF THE DISORDERED AND ORDERED
PHASES, THE DENSITY AND THE DEGREE OF ORDER OF THE ORDERED PHASE
DECREASE WITH INCREASING TEMPERATURE, UP TO A TEMPERATURE WHERE THE
THEORY PREDICTS A NARROW TWO-PHASE REGION WITH INCREASING DENSITY OF
BOTH PHASES FOR INCREASING TEMPERATURE. MD SIMULATIONS SHOW THAT
MONOCRYSTALS OF THE SOLID AND LIQUID CRYSTALS HAVE A PROLATE SHAPE WITH
THE AXIS PARALLEL TO THE DIRECTION OF CONCENTRATION OSCILLATIONS, AND
THE DEVIATION FROM THE SPHERICAL SHAPE INCREASES WITH INCREASING
PERIODIC ORDER. 

Ref.: Oksana Patsahan, Marek Litniewski and Alina Ciach. "Self-assembly
in mixtures with competing interactions." _Soft Matter_ 17.10 (2021):
2883-2899. [2] 

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Links:
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[1] https://utn.zoom.us/j/89038134365
[2] https://doi.org/10.1039/D0SM02072A
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