Crossover in the kinetic growth process of porphyrin aggregation

被引：39

作者：

Mallamace, F

Scolaro, LM

Romeo, A

Micali, NB

机构：

[1] MIT, Dept Nucl Engn, Cambridge, MA 02139 USA

[2] Univ Messina, Dipartimento Chim Inorgan Chim Analit & Chim Fis, Messina, Italy

[3] CNR, ICTPN, Messina, Italy

[4] Univ Messina, Ist Tecn Spettroscop, I-98166 Messina, Italy

[5] Univ Messina, Dipartimento Fis, I-98166 Messina, Italy

[6] Ist Nazl Fis Mat, Unita Messina, I-98166 Messina, Italy

来源：

PHYSICAL REVIEW LETTERS | 1999年 / 82卷 / 17期

关键词：

D O I：

10.1103/PhysRevLett.82.3480

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

By combining ultraviolet and visible absorption and elastic light scattering measurements we have studied the salt-induced aggregation kinetics of the porphyrin t-H2Pagg in aqueous solution, The temporal evolution of the spectra, directly related to the time dependence of the monomer concentration and the mean cluster size, shows unambiguously the presence of an early stage driven by a reaction limited aggregation. After a variable time (dependent on the salt concentration) a crossover to a diffusion-limited aggregation regime is observed. Elastic light scattering data confirm such a result.

引用

页码：3480 / 3483

页数：4

共 27 条

[1]

Bohren C F., 1998, Absorption and Scattering of Light by Small Particles

[2]

CHEN SH, 1992, STRUCTURE DYNAMICS S

[3] CROSSOVER REGION IN THE AGGREGATION OF COLLOIDS [J].

DIBIASIO, A ;

BOLLE, G ;

CAMETTI, C ;

CODASTEFANO, P ;

SCIORTINO, F ;

TARTAGLIA, P .

PHYSICAL REVIEW E, 1994, 50 (02) :1649-1652

[4] KINETICS OF EPITAXIAL-GROWTH AND ROUGHENING [J].

FAMILY, F ;

AMAR, JG .

MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY, 1995, 30 (2-3) :149-166

[5] CLUSTER SIZE DISTRIBUTION IN CHEMICALLY CONTROLLED CLUSTER CLUSTER AGGREGATION [J].

FAMILY, F ;

MEAKIN, P ;

VICSEK, T .

JOURNAL OF CHEMICAL PHYSICS, 1985, 83 (08) :4144-4150

[6]

Jullien R., 1987, AGGREGATION FRACTAL

[7] SCALING OF KINETICALLY GROWING CLUSTERS [J].

KOLB, M ;

BOTET, R ;

JULLIEN, R .

PHYSICAL REVIEW LETTERS, 1983, 51 (13) :1123-1126

[8]

Leyvraz F., 1986, On Growth and Form - Fractal and Non-Fractal Patterns in Physics. Proceedings of the NATO Advanced Study Institute, P136

[9] SINGULARITIES IN THE KINETICS OF COAGULATION PROCESSES [J].

LEYVRAZ, F ;

TSCHUDI, HR .

JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL, 1981, 14 (12) :3389-3405

[10] STRUCTURE AND ANISOTROPY OF COLLOID AGGREGATES [J].

LINDSAY, HM ;

KLEIN, R ;

WEITZ, DA ;

LIN, MY ;

MEAKIN, P .

PHYSICAL REVIEW A, 1989, 39 (06) :3112-3119

← 1 2 3 →