X-ray and neutron reflectometry investigation of Langmuir-Blodgett films of cellulose ethers

Langmuir : the ACS Journal of Surfaces and Colloids
Yubao ZhangAnna M Ritcey

Abstract

Langmuir-Blodgett films of a series of cellulose ethers are investigated by X-ray and neutron reflectometry. Two types of samples are considered: simple alkyl ethers of cellulose and derivatives obtained by the alkylation of (2-hydroxypropyl)cellulose (HPC). All of the cellulose ethers form stable monolayers at the air-water interface. Significant differences are, however, found in the surface pressure-area compression isotherms. Ethers prepared from HPC typically exhibit larger limiting molecular areas and higher surface pressures than the corresponding simple cellulose ethers. The ease of monolayer transfer to hydrophobic silicon substrates differs greatly from one type of molecule to another. Successful transfer conditions are found only for ethers that form stable monolayers at sufficiently high surface pressures. Surprisingly, deuterated HPC ethers, prepared for neutron reflectivity measurements, exhibit monolayer properties significantly different from those of their hydrogenated analogues. Although essentially identical limiting molecular areas are found, the surface pressure corresponding to a characteristic plateau transition in the compression isotherm is found to decrease by about 8-10 mN m(-1) upon side chain deuter...Continue Reading

Citations

Jun 1, 2008·Biointerphases·John KatsarasMu-Ping Nieh
Jun 12, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Ian M TuckerRobert K Thomas
Sep 22, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Youssef HabibiOrlando J Rojas
Feb 24, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·I TuckerR K Thomas
Jul 10, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·J PenfoldR K Thomas
Jun 3, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Jeffrey PenfoldDevinderjit S Sivia
Mar 9, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Wakako KasaiTetsuo Kondo

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