Humidity Swelling/Deswelling Hysteresis in a Polyelectrolyte Multilayer Film

Secrist, Kimberly E.; Nolte, Adam J.

doi:10.1021/ma101983s

Cited by 77 publications

(114 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fortunately, film thickness and swelling, and consequently the extent of protein capture, vary greatly with polyelectrolyte composition and deposition conditions (35)(36)(37)(38)(39)(40)(41). Ma and coworkers (42) increased lysozyme adsorption approximately sixfold in poly(allylamine)/poly(acrylic acid) (PAA) multilayer films by lowering the pH of deposition solutions from 5 to 3.…”

Section: Modification Of Membranes With Functional Polymeric Thin Filmsmentioning

confidence: 99%

Functionalizing Microporous Membranes for Protein Purification and Protein Digestion

Dong

Bruening

2015

Annual Rev. Anal. Chem.

View full text Add to dashboard Cite

This review examines advances in the functionalization of microporous membranes for protein purification and the development of protease-containing membranes for controlled protein digestion prior to mass spectrometry analysis. Recent studies confirm that membranes are superior to bead-based columns for rapid protein capture, presumably because convective mass transport in membrane pores rapidly brings proteins to binding sites. Modification of porous membranes with functional polymeric films or TiO₂ nanoparticles yields materials that selectively capture species ranging from phosphopeptides to His-tagged proteins, and protein-binding capacities often exceed those of commercial beads. Thin membranes also provide a convenient framework for creating enzyme-containing reactors that afford control over residence times. With millisecond residence times, reactors with immobilized proteases limit protein digestion to increase sequence coverage in mass spectrometry analysis and facilitate elucidation of protein structures. This review emphasizes the advantages of membrane-based techniques and concludes with some challenges for their practical application.

show abstract

Section: Modification Of Membranes With Functional Polymeric Thin Filmsmentioning

confidence: 99%

Functionalizing Microporous Membranes for Protein Purification and Protein Digestion

Dong

Bruening

2015

Annual Rev. Anal. Chem.

View full text Add to dashboard Cite

show abstract

“…However, in all these applications it is necessary to determine how moisture interacts with the NFCcontaining LbL films. Previous works (Wong et al 2004;Tanchak et al 2004;Burke, Barrett 2005;Secrist, Nolte 2011;Nolte et al 2008;Lösche et al 1998) on the interaction of moisture with LbL films (all without NFC) have assumed an isotropic homogenous LbL film that swells in contact with moist air and that no separate water film is condensed on top of the film. This leads to the objective of the current work: How can the optical properties of the NFC based LbL thin films be described and how do they interact with the moisture in the ambient air?…”

Section: Addresses Of the Authorsmentioning

confidence: 99%

Dynamics of moisture interaction with polyelectrolyte multilayers containing nanofibrillated cellulose

Granberg¹,

Coppel²,

Eita³

et al. 2012

Nordic Pulp &Amp; Paper Research Journal

View full text Add to dashboard Cite

SUMMARY:Recent findings have shown that it is possible to use the Layer-by-Layer technique to create nanofibrillated cellulose / polyethyleneimine interference films whose colour change with relative humidity. This study uses different optical models to describe spectral ellipsometry measurements data of interference films and how the film properties alter in dry and humid environments. The results indicate that water condensation initially is filling the surface pores within seconds whereas relaxation of the film to adjust to the added water is a slower process that reaches a steady state after 20 min. The maximum swelling ratio of the LbL films is almost independent of the number of layers within the film, but decreases considerably by crosslinking via heat treatment. The films show a distinct birefringence with optical axis perpendicular to the surface. Analysis of the moisture response with different optical models indicates that the films swell uniformly in the thickness direction with no separate water film on top. The results provide important understanding for the design of NFC based LbL films for visual moisture sensors and interactive security paper. Since the introduction in the late 1980s, the Layer-byLayer (LbL) technique (Decher et al. 1991, Decher 1997 has initiated a large interest in the scientific community. Using the LbL technique, it is possible to construct welldefined nanometer thin layers of oppositely charged polyelectrolytes and/or colloids at any solid-liquid interface. ADDRESSES OF THE AUTHORSDuring the last decade, there has been a large focus on using NanoFibrillated Cellulose (NFC) (Klemm et al. 2011) in new materials. NFC emanates from the cellulose fibrils inside the wood fibre wall and the fibrils are liberated in different ways using both chemical treatment and high pressure homogenization (Klemm et al. 2011;Eichhorn et al. 2010) to separate the fibrils from each other and to stabilize them in aqueous dispersion. Depending on the preparation conditions, it is also possible to create negatively as well as positively charged NFCs with different charge densities (Klemm et al. 2011) on the nanomaterial surfaces. This naturally affects the stability of the dispersions, their self-associative properties and their interactions with other nanomaterials.It has been shown that the build-up of the LbL structure is so regular that the deposition of each NFC layer ) creates a colour change after a few bilayers of polyethyleneimine (PEI) and NFC on a silicon wafer. This opened totally new possibilities to create interactive products , such as for example moisture sensors, since the layers are sensitive to moisture and will change colour depending on how much water that is adsorbed into the LbL structure. Another very interesting application is in security paper where LbL structures are first formed and then transferred to paper by for example microcontact printing. However, in all these applications it is necessary to determine how moisture interacts with the NFCcontaining LbL films. Previou...

show abstract

“…Due to their hydrophilic nature, polyelectrolyte multilayer films (PEM) made by LbL assembly are inherently responsive to humidity. Therefore, studies have been dedicated to investigating the fundamental effect of relative humidity (RH) on PEM films . For example, neutron reflectometry was employed to study PEM films at different levels of RH, suggesting that poly(styrene sulfonate) (PSS)/poly(allylamine hydrochloride) (PAH) films can hold up to 40 vol% of water at the hydrated state .…”

Section: Introductionmentioning

confidence: 99%

“…For example, neutron reflectometry was employed to study PEM films at different levels of RH, suggesting that poly(styrene sulfonate) (PSS)/poly(allylamine hydrochloride) (PAH) films can hold up to 40 vol% of water at the hydrated state . In addition, PAH/poly(acrylic acid) (PAA) films showed reversible hysteretic swelling/deswelling behavior by varying RH, with 1.4 times relative thickness achieved by incubating at 100% RH (comparing to 10% RH) . It was demonstrated that the initial swelling of PEM only happened on the order of seconds to minutes, and less than 3% of thickness change was further observed over an additional 8 days of incubation .…”

Section: Introductionmentioning

confidence: 99%

“…In addition, PAH/poly(acrylic acid) (PAA) films showed reversible hysteretic swelling/deswelling behavior by varying RH, with 1.4 times relative thickness achieved by incubating at 100% RH (comparing to 10% RH) . It was demonstrated that the initial swelling of PEM only happened on the order of seconds to minutes, and less than 3% of thickness change was further observed over an additional 8 days of incubation . Based on their fast and sensitive response of PEM to moisture, humidity responsive LbL films have been developed for applications such as shape memory films, self‐healing films, antifogging coating, and vapor sensing .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Photopatternable Nanolayered Polymeric Films with Fast Tunable Color Responses Triggered by Humidity

Dong

Zhang

Wang

et al. 2019

Adv Funct Materials

View full text Add to dashboard Cite

Smart surfaces that can dynamically respond to environmental stimuli have demonstrated great promise in wearable electronics and optical detectors. Herein, a photopatternable nanolayered polymeric film that can reversibly display and hide structural colors in the visible range in response to relative humidity (RH) changes is reported. This film is fabricated on a silicon substrate using layer-by-layer assembly of chitosan and photoreactive carboxymethyl cellulose-azido derivative, and selectively crosslinked through UV irradiation from a photomask. Compared to crosslinked regions, un-crosslinked ones swell more and result in a larger thickness at high RH; as a result, those two regions show distinguishable color differences. The correlation of displayed color with film thickness at various RHs is plotted in an International Commission on Illumination (CIE) chromaticity diagram, which is in good agreement with the results obtained from modeling based on the interference theory. It is demonstrated that the structural color patterns on the film can be hidden and displayed spontaneously by contact with humid air, including human breath.This humidity-triggered color change is fast, of fine resolution, highly reversible, and compatible with most silicon-based devices. This film is low-cost, stable, and ready to be applied to large surface areas for potential applications in anticounterfeiting, humidity sensors, and optical color filters.

show abstract

Humidity Swelling/Deswelling Hysteresis in a Polyelectrolyte Multilayer Film

Cited by 77 publications

References 33 publications

Functionalizing Microporous Membranes for Protein Purification and Protein Digestion

Functionalizing Microporous Membranes for Protein Purification and Protein Digestion

Dynamics of moisture interaction with polyelectrolyte multilayers containing nanofibrillated cellulose

Photopatternable Nanolayered Polymeric Films with Fast Tunable Color Responses Triggered by Humidity

Contact Info

Product

Resources

About