LATTICE RESOLUTION AND SOLUTION KINETICS ON SURFACES OF AMINO-ACID CRYSTALS - AN ATOMIC FORCE MICROSCOPE STUDY

被引：50

作者：

MANNE, S ^{[1
]}

CLEVELAND, JP ^{[1
]}

STUCKY, GD ^{[1
]}

HANSMA, PK ^{[1
]}

机构：

[1] UNIV CALIF SANTA BARBARA,DEPT CHEM,SANTA BARBARA,CA 93106

来源：

JOURNAL OF CRYSTAL GROWTH | 1993年 / 130卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0022-0248(93)90874-V

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

We report atomic force microscopy (AFM) results on six amino acid crystal surfaces: glycine, L-aspartic acid, L-valine, L-isoleucine, L-leucine, and L-phenylalanine. Samples were grown by slow evaporation of concentrated aqueous solutions. All samples contained crystalline areas where the AFM showed extended molecularly flat sheets (up to hundreds of nm in size) separated by steps a single molecule thick. The ordered lattice of each amino acid could be imaged on the sheets. Images revealed periodicities corresponding to bulk terminations in most cases, as well as other periodicities which probably correspond to molecular structure within the unit cell. Step motion kinetics were also imaged in situ during dissolution of L-leucine in flowing propanol. Steps oriented along the [010] direction traveled with speeds that were independent of both interstep distance and solvent flow rate for flow rates above 20 mul/s, indicating a reaction rate limited process. Orthogonal bends along the [001] direction moved at speeds one to ten times that of steps, with narrow bends moving faster than wide. We speculate that these speed differences were caused by anisotropy in reaction kinetics coupled with partially saturated boundary layers near wide bends.

引用

页码：333 / 340

页数：8

共 22 条

[11] MOLECULAR RESOLUTION IMAGES OF AMINO-ACID CRYSTALS WITH THE ATOMIC FORCE MICROSCOPE [J].

GOULD, S ;

MARTI, O ;

DRAKE, B ;

HELLEMANS, L ;

BRACKER, CE ;

HANSMA, PK ;

KEDER, NL ;

EDDY, MM ;

STUCKY, GD .

NATURE, 1988, 332 (6162) :332-334

[12]

GRATZ AJ, IN PRESS GEOCHIM COS

[13] AFM IMAGES OF DISSOLUTION AND GROWTH ON A CALCITE CRYSTAL [J].

HILLNER, PE ;

MANNE, S ;

GRATZ, AJ ;

HANSMA, PK .

ULTRAMICROSCOPY, 1992, 42 :1387-1393

[14]

HILLNER PE, 1992, GEOLOGY, V20, P359, DOI 10.1130/0091-7613(1992)020<0359:ASIOCG>2.3.CO

[15]

[16]

HILLNER PE, 1992, SPIE P, V1639, P160

[17]

Khawas B., 1985, Indian Journal of Physics, Part A, V59A, P219

[18] TRANSFER OF STRUCTURAL INFORMATION FROM LANGMUIR MONOLAYERS TO 3-DIMENSIONAL GROWING-CRYSTALS [J].

LANDAU, EM ;

LEVANON, M ;

LEISEROWITZ, L ;

LAHAV, M ;

SAGIV, J .

NATURE, 1985, 318 (6044) :353-356

[19] MOLECULAR-SURFACE STRUCTURE OF ORGANIC-CRYSTALS OBSERVED BY ATOMIC FORCE MICROSCOPY [J].

OVERNEY, RM ;

HOWALD, L ;

FROMMER, J ;

MEYER, E ;

BRODBECK, D ;

GUNTHERODT, HJ .

ULTRAMICROSCOPY, 1992, 42 :983-988

[20] ATOMIC FORCE MICROSCOPY [J].

RUGAR, D ;

HANSMA, P .

PHYSICS TODAY, 1990, 43 (10) :23-30

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