X-ray reflectivity study of polymer assembly at air-water interface

Kago, Keitaro; Matsuoka, Hideki; Endo, Hitoshi; Eckelt, John; Yamaoka, H.

doi:10.1016/s0968-5677(98)00030-3

Cited by 17 publications

(29 citation statements)

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“…23 The procedure of data fitting and simulation is based on the theory of Parratt 24 and Sinha et al 25 The details of data treatment and analysis were fully described in our previous papers. 16,17 …”

Section: Methodsmentioning

confidence: 99%

“…Calculations and data analysis for XR were made using a scientific software program invented by Rigaku Corp. and the scientific program “MUREX118 (Multiple Reflection of X-rays)” . The procedure of data fitting and simulation is based on the theory of Parratt and Sinha et al The details of data treatment and analysis were fully described in our previous papers. , …”

Section: Methodsmentioning

confidence: 99%

“…In addition, this apparatus has a Langmuir−Blodgett (LB) trough at the sample position, which enables to study the structure of the monolayer as a function of the surface pressure, directly. By using this apparatus, we have been performing systematical XR study for amphiphilic diblock copolymer monolayer, , photosensitive amphiphilic graft polymer monolayer, lipid monolayer−DNA complex, and lipid monolayer−protein complex at the air−water interface.…”

Section: Introductionmentioning

confidence: 99%

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Self-Assembly of Poly(1,1-diethylsilabutane)-block-poly(2-hydroxyethyl methacrylate) Block Copolymer. 2. Monolayer at the Air−Water Interface

et al. 1999

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A spread monolayer of the amphiphilic block polymer poly(1,1-diethylsilabutane)-blockpoly(2-hydroxyethyl methacrylate) (poly(SB-b-HEMA)) on the water surface was investigated by X-ray reflectivity (XR) measurements. Clear Kiessig fringes were observed up to the third order in the XR curve. This observation means the formation of the smooth-faced monolayer with high uniformity of thickness. The thickness of the monolayer increased with increasing surface pressure. Model fitting with the two-layer model revealed that the upper layer is formed by the melt of the SB chains and that the lower layer consists of hydrated HEMA chains. The flexibility of the SB chain is thought to be an origin for the formation of the smooth, dense, and variable-thickness polymer monolayer on the water surface.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Self-Assembly of Poly(1,1-diethylsilabutane)-block-poly(2-hydroxyethyl methacrylate) Block Copolymer. 2. Monolayer at the Air−Water Interface

et al. 1999

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“…We have been using a diblock copolymer spread monolayer for studying hydrophobic‐hydrophilic interactions as well as the polyelectrolyte brush structure 15, 16, 20–23. Recently, we have used poly(diethylsilacyclobutane) as a hydrophobic block in the amphiphilic polymer because it forms a very smooth and uniform hydrophobic monolayer on water.…”

Section: Introductionmentioning

confidence: 99%

Carpetlike dense‐layer formation in a polyelectrolyte brush at the air/water interface

Mouri

Matsumoto

Matsuoka

2003

J Polym Sci B Polym Phys

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A carpetlike dense‐layer formation between a hydrophobic layer and a polyelectrolyte brush layer has been found in the monolayers of an ionic amphiphilic diblock copolymer, poly(1,1‐diethylsilacyclobutane)m‐block‐poly(methacrylic acid)n, on a water surface by an X‐ray reflectivity technique. By detailed analysis, we have found that the hydrophilic layer under the water is not a simple layer but is divided into two layers, that is, a carpetlike dense methacrylic acid (MAA) layer near the hydrophobic layer and a polyelectrolyte brush layer. We have also confirmed that a well‐established polyelectrolyte brush is formed only for the m:n = 43:81 polymer monolayer: For m:n = 40:10 and m:n = 45:60 polymer monolayers, only a dense MAA layer is formed. This dense‐layer formation should be the origin of the interesting hydrophobic‐layer thickness variation previously reported; The hydrophobic‐layer thickness takes a minimum as a function of the hydrophilic chain length at any surface pressure studied. An overview of the data for three samples with different chain lengths (m:n = 40:10, 45:60, or 43:81) has shown that the thickness of this dense layer is 10–20 Å and is independent of the surface pressure and polymerization degree of poly(methacrylic acid) (PMAA) in the range studied. This dense‐layer formation is explained by the reasonable speculation that contact with PMAA is thermodynamically more stable than direct contact with water for the diethylsilacyclobutane (Et2SB) layer on water. In this sense, the dense layer acts like a carpet for the hydrophobic Et2SB layer, and a 10–20‐Å thickness could be a critical value for the carpet. © 2003 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 41: 1921–1928, 2003

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“…However, most of them use a strong X-ray source from synchrotron radiation (SR) − and neutrons, ,, which are very limited in use for experimentalists in related fields. Some investigators have developed the XR apparatus for the study of a monolayer on a water surface with a rotating anode X-ray generator. − In 1996, Yamaoka et al succeeded in constructing a specially designed XR apparatus for the study of a monolayer on a water surface for laboratory use. − This apparatus has a Langmuir−Blodgett (LB) trough at the sample position; hence, the structure of the monolayer on a water surface can be studied as a function of the surface pressure, directly. Although this instrument has a conventional X-ray source (not synchrotron), it covers 8 decades of reflectivity, which is almost comparable to the SR apparatus .…”

Section: Introductionmentioning

confidence: 99%

Direct in Situ Observation of a Lipid Monolayer−DNA Complex at the Air−Water Interface by X-ray Reflectometry

et al. 1999

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Direct in situ observation of the fine structure of the cationic lipid monolayer−DNA complex on a water surface has been carried out by using an air−water interface X-ray reflectivity (XR) instrument. Interestingly, the thickness of the DNA layer was markedly thinner than the geometry of the cylindrical DNA molecule when the complex was deposited on the solid substrates; the thickness was determined to be 11 Å by XR measurement in a dried state, while the diameter of the DNA molecule is about 24 Å. However, the thickness in the complex on a water surface was estimated by in situ XR measurement to be about 25−28 Å, which is comparable to the geometry of the DNA molecule. Thus, the anomalously thin thickness was due to some experimental treatments, such as deposition on a solid substrate and/or drying. The structure of the monolayer and monolayer−polymer complex on the solid substrates in a dried state is not the same as that on a water surface. The possibility of some dynamic fluctuation of its structure was also suggested. These results strongly indicate the importance of a direct in situ study such as by the XR technique for the structural study of the monolayer and monolayer complex on a water surface.

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X-ray reflectivity study of polymer assembly at air-water interface

Cited by 17 publications

References 0 publications

Self-Assembly of Poly(1,1-diethylsilabutane)-block-poly(2-hydroxyethyl methacrylate) Block Copolymer. 2. Monolayer at the Air−Water Interface

Self-Assembly of Poly(1,1-diethylsilabutane)-block-poly(2-hydroxyethyl methacrylate) Block Copolymer. 2. Monolayer at the Air−Water Interface

Carpetlike dense‐layer formation in a polyelectrolyte brush at the air/water interface

Direct in Situ Observation of a Lipid Monolayer−DNA Complex at the Air−Water Interface by X-ray Reflectometry

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