Nanostructured LB films developed from poly( p -acryloylaminophenylmethylphosphonic) acid
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Nanostructured LB films developed from poly(p-acryloylaminophenylmethylphosphonic) acid Rosa E. Lazo-Jiménez 1, José A. Chávez-Carvayar 2, Ana M. Herrera-González 3, Valentin Islas-Pérez 4, María P. Carreón-Castro 1 1
Instituto de Ciencias Nucleares. Universidad Nacional Autónoma de México (UNAM). Circuito Exterior s/n. C.P. 04510. Ciudad Universitaria. D.F. México 2 Instituto de Investigaciones en Materiales. Universidad Nacional Autónoma de México (UNAM). Circuito Exterior s/n. C.P. 04510. Ciudad Universitaria. D.F. México. 3 Universidad Autónoma del Estado de Hidalgo. Carretera a Pachuca-Tulancingo Km. 4.5. Mineral de la Reforma. C.P. 42184. Hidalgo 4 Facultad Estudios Superiores Zaragoza-UNAM. Avenida Guelatao No. 66. Ejército de Oriente. Iztapalapa. C.P. 09230. D.F. México ABSTRACT In this paper, the formation of Langmuir-Blodgett films of poly(pacryloylaminophenylmethylphosphonic) acid polymers, with general formula (C10H12NPO4)n are reported. The Langmuir-Blodgett (LB) technique was used for building ordered nanostructures in molecular assemblies of these polymers, which were able to form stable films. At the air-water interface, these polymers (with low and high molecular weight) formed Langmuir (L) monolayers, which were characterized by surface pressure versus molecular area (π-A) isotherms and Brewster´s Angle Microscopy (BAM). Using the LB method, molecular mono and multilayer films of these polymers were prepared and transferred onto glass substrates forming Z-type multilayers, with a transfer ratio close to unity. These LB films were characterized by Atomic Force Microscopy (AFM). INTRODUCTION Recently, thin films developed from polymers have become important fields of study. This research, to obtain thin films of new nanomaterials, was based on organic compounds involving many scientific and technological fields, particularly because the LB technique has been extended to non-classical LB materials, such as polymers and other macromolecular systems. Unlike low molecular weight substances, strong amphiphilic character is not strictly required for polymers; macromolecules without pronounced amphiphility, and even water soluble polymers, may form a surface layer on liquids [1]. The Langmuir-Blodgett (LB) technique is an interesting alternative for the formation of new nanomaterials, like ultra-thin films. A major feature of this technique is the possibility to obtain well-ordered monomolecular films with controlled thickness. In general, polymer LB films have greater thermal, chemical and mechanical stability than LB films of low molecular weight compounds. Because of this, polymer LB films are good candidates for
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capacitor-like applications, metal-insulator-semiconductor devices, opto-electronic devices and a variety of sensors [2]. It has been found that N-alkylacrylamide pol
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