Layered structure of Langmuir-Blodgett polymer films measured by interlayer energy transfer

Ohmori, Satoru; Ito, Shinzaburo; Yamamoto, Masahide

doi:10.1021/ma00009a039

Cited by 40 publications

(32 citation statements)

References 2 publications

(2 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The change of transfer efficiencies with time indicates the alteration of a 2 , which was fitted to the theoretical prediction of the Fickian diffusion model: (2) where D is the diffusion constant of polymer segments and a5 is the initial dispersion due to the Y-type deposition (double layer, 2nm thick) and also due to a little disordering at the deposition process. Therefore, the fitting procedure allowed us to evaluate the diffusion constant in the polymer LB films.…”

Section: Measurementsmentioning

confidence: 99%

“…with good correlation coefficients close to unity. The de Gennes reptation model predicts the relationship of DrxM-;, 2 for entangled chains at diffusion times longer than the reptation timer at which the whole chain escapes from the initial configuration. Winnik et al also have reported similar correlation between the molecular weight and polymer diffusion at the interfaces of latex films using the energy transfer technique.…”

Section: Such Tendency Has Been Often Observed M Variousmentioning

confidence: 99%

See 1 more Smart Citation

Structural Relaxation of Ultrathin Polymer Films Prepared by the Langmuir-Blodgett Technique. Molecular Weight Effect on the Diffusion of Polymer Segments

Ito

Kawano

Mabuchi

et al. 1996

Polym J

Self Cite

View full text Add to dashboard Cite

Structural relaxation of polymer Langmuir-Blodgett (LB) films has been studied by the energy transfer method, in particular, with respect to the molecular weight (M wl effect on the diffusion processes. A very high molecular weight poly(vinyl octanal acetal) (PVO) was prepared as the host matrix of the LB multilayers. The low molecular weight PVO's (mono-dispersed in the range of M w = 1.6 x I 0 4-2 x I 0 5) were labeled with energy donating and accepting probes, and these monolayers were embedded into the high molecular weight PVO layers. The energy transfer measurements provided selectively the diffusion constants (D) of the low molecular weight components in the direction normal to the layer plane. The values of D rapidly decreased with increasing the molecular weight, but leveled out for the higher M w's than 6 x 10 4 , i.e., they became almost independent of the molecular weight. This striking effect indicates that when the size of single polymer chain becomes larger than the spatial distance examined, the relaxation of the layered structure takes place mainly by the segmental motion of polymer chains from nonequilibrium conformations confined in the two-dimensional plane. KEY WORDS Polymer Langmuir-Blodgett Film I Energy Transfer Method I Structural Relaxation I Diffusion Coefficient I Molecular Weight Effect!

show abstract

Section: Measurementsmentioning

confidence: 99%

Section: Such Tendency Has Been Often Observed M Variousmentioning

confidence: 99%

Structural Relaxation of Ultrathin Polymer Films Prepared by the Langmuir-Blodgett Technique. Molecular Weight Effect on the Diffusion of Polymer Segments

Ito

Kawano

Mabuchi

et al. 1996

Polym J

Self Cite

View full text Add to dashboard Cite

show abstract

“…The Langmuir-Blodgett (LB) technique is one that has been widely used to fabricate organic monolayers [12] and many possible applications have been suggested for this. [13,14] Also, there have been many studies on inorganic films using the LB technique because of its extremely thin and well-ordered features. […”

Section: Introductionmentioning

confidence: 99%

Interfacial reactions of nickel ion containing multilayers and nickel ultra‐thin films with an interpenetrating polymer network substrate

Tang

Han

2011

Surface & Interface Analysis

View full text Add to dashboard Cite

An interpenetrating polymer network (IPN) substrate was prepared by dip-pulling a silicon wafer or glass plate into polymer precursors, followed by solidification at room temperature. The nickel ion containing Langmuir-Blodgett (LB) multilayers was subsequently fabricated onto the IPN substrate by a LB technique, and then the nickel ultra-thin films were deposited by chemical reduction. The interfacial reactions, the metal transformations and the non-metal bond types during the film formation were detected by the X-ray photoelectron spectroscopy, atomic force microscope and attenuated total reflection infrared spectroscopy.

show abstract

“…Researchers are now pursuing the treatment at relatively low or room temperatures while retaining the efficiency of metal deposition onto the polymers [11]. The Langmuir-Blodgett (LB) technique is one that has been widely used to fabricate organic monolayers [12,13] and many possible applications have been suggested for them [14][15][16][17]. Metal ions have also been incorporated into LB films with many applications in mind.…”

Section: Introductionmentioning

confidence: 99%

Preparation of a Nickel Ion Containing Langmuir–Blodgett Multilayer and an Ultra-Thin Nickel Film Deposited on an Interpenetrating Polymer Network Substrate

Tang¹,

Ji²,

Zhang³

2010

Journal of Adhesion Science and Technology

View full text Add to dashboard Cite

The nickel ion containing Langmuir-Blodgett (LB) multilayer was prepared by transferring nickel acetate, spread on the surface of a sub-phase of ultra-pure water and stearic acid-chloroform mixture, onto an interpenetrating polymer network (IPN) substrate. The substrate was prepared by dip-pulling a hydrophilic silicon wafer or a glass plate into precursors, followed by solidification at room temperature, in order to create an ultra-thin and uniform surface for metal deposition. The multilayer was then converted into an ultra-thin nickel film after chemical reduction by 0.01 mol/l sodium borohydride. The surface pressure of the monolayer and dipping speed of substrate were determined by measuring the transfer coefficient. Fourier transform infrared spectroscopy (FT-IR) was used to investigate the interactions of the nickel ions with the IPN during the multilayer deposition on substrate, and the metal transformations of nickel ion in the ultrathin film. The shifted peak location for -C=O verified the interactions between the IPN and the nickel ion and the transformation of the nickel ion by reduction. Further reduction caused the organic phase to dissolve, resulting in most of it being removed from the multilayer. The surface morphologies of the LB multilayer were detected by atomic force microscopy (AFM). Compared with the IPN, which formed a uniform and flat film, within a range of nanometers, the Ni/IPN multilayer and Ni ultra-thin film both showed some surface fluctuations, although these were still within nanometer range. The roughness of the nickel ion containing multilayer and the ultra-thin nickel film was 1.123 nm and 0.773 nm with a maximum height of 12.451 nm and 14.933 nm, respectively, which were larger than that of pure IPN substrate of 0.593 nm with the max height of 6.795 nm.

show abstract

Layered structure of Langmuir-Blodgett polymer films measured by interlayer energy transfer

Cited by 40 publications

References 2 publications

Structural Relaxation of Ultrathin Polymer Films Prepared by the Langmuir-Blodgett Technique. Molecular Weight Effect on the Diffusion of Polymer Segments

Structural Relaxation of Ultrathin Polymer Films Prepared by the Langmuir-Blodgett Technique. Molecular Weight Effect on the Diffusion of Polymer Segments

Interfacial reactions of nickel ion containing multilayers and nickel ultra‐thin films with an interpenetrating polymer network substrate

Preparation of a Nickel Ion Containing Langmuir–Blodgett Multilayer and an Ultra-Thin Nickel Film Deposited on an Interpenetrating Polymer Network Substrate

Contact Info

Product

Resources

About