Two-Dimensional Stacked Composites of Self-Assembled Alkane Layers and Graphene for Transparent Gas Barrier Films with Low Permeability

To improve stretchability of gas barrier films without sacrificing the barrier property, alternatively charged and highly flexible polyurethane chains were layer-by-layer self-assembled with graphene oxide nano-platelets.

Download Full-text

Improvement Approach for Gas Barrier Behavior of Polymer/Clay Nanocomposite Films

MRS Advances ◽

10.1557/adv.2017.458 ◽

2017 ◽

Vol 2 (57) ◽

pp. 3547-3552 ◽

Cited By ~ 4

Author(s):

Maedeh Dabbaghianamiri ◽

Sayantan Das ◽

Gary W. Beall

Keyword(s):

Polymer Nanocomposites ◽

Food Packaging ◽

Barrier Properties ◽

Nanocomposite Films ◽

Layer By Layer ◽

Gas Barrier ◽

Barrier Films ◽

High Particle ◽

Polymer Clay Nanocomposite ◽

Self Assembled

ABSTRACTPolymer nanocomposites (PNC) include a copolymer or polymer which has nanoparticles dispersed in the polymer matrix at the nano-level. One of the most common types of polymer nanocomposites contain smectic clays as the nanoparticles. These clay minerals increase the mechanical properties of standard polymers and improve barrier properties. For optimum barrier properties, Layer-by-Layer assembly (LbL) is one of the most effective methods for depositing thin films. LbL methods however, are quite tedious and produce large quantities of waste. A newly discovered phenomenon of self-assembled polymer nanocomposites utilizes entropic forces to drive the assembly to spontaneously form a larger nanostructured film. This approach allows polymers and nanoparticles with high particle loadings to be mixed, and create the super gas barrier films. We have developed a coating technique which can be employed to make self-assembled gas barrier films via inkjet printing. This technique is industrially scalable and efficient. This is because it does not need any rinsing step and drying steps as required in LbL. The influence of different polymers Polyvinylpyrrolidone (PVP) and Poly (acrylic acid) PAA with Montmorillonite (MMT) nanoclay solutions on Polyethylene terephthalate (PET) substrate is examined to study their effectiveness as a gas barrier film. The results showing the excellent oxygen barrier behavior of a combination of PVP and MMT Nano clay nanocomposite with high transparency. These high barrier gas nanocomposite films are good candidates for a variety of food packaging applications.

Download Full-text

Template-Free Self-Assembly of Two-Dimensional Polymers into Nano/Microstructured Materials

Molecules ◽

10.3390/molecules26113310 ◽

2021 ◽

Vol 26 (11) ◽

pp. 3310

Author(s):

Shengda Liu ◽

Jiayun Xu ◽

Xiumei Li ◽

Tengfei Yan ◽

Shuangjiang Yu ◽

...

Keyword(s):

Self Assembly ◽

Recent Progress ◽

Two Dimensional ◽

Subsequent Removal ◽

The Past ◽

2D Polymers ◽

Template Free ◽

Self Assembled ◽

The Relationship ◽

Polymer Tubes

In the past few decades, enormous efforts have been made to synthesize covalent polymer nano/microstructured materials with specific morphologies, due to the relationship between their structures and functions. Up to now, the formation of most of these structures often requires either templates or preorganization in order to construct a specific structure before, and then the subsequent removal of previous templates to form a desired structure, on account of the lack of “self-error-correcting” properties of reversible interactions in polymers. The above processes are time-consuming and tedious. A template-free, self-assembled strategy as a “bottom-up” route to fabricate well-defined nano/microstructures remains a challenge. Herein, we introduce the recent progress in template-free, self-assembled nano/microstructures formed by covalent two-dimensional (2D) polymers, such as polymer capsules, polymer films, polymer tubes and polymer rings.

Download Full-text

Two-Dimensional Layered Oxide Structures Tailored by Self-Assembled Layer Stacking via Interfacial Strain

ACS Applied Materials & Interfaces ◽

10.1021/acsami.6b03773 ◽

2016 ◽

Vol 8 (26) ◽

pp. 16845-16851 ◽

Cited By ~ 14

Author(s):

Wenrui Zhang ◽

Mingtao Li ◽

Aiping Chen ◽

Leigang Li ◽

Yuanyuan Zhu ◽

...

Keyword(s):

Two Dimensional ◽

Layered Oxide ◽

Layer Stacking ◽

Interfacial Strain ◽

Self Assembled ◽

Self Assembled Layer

Download Full-text

Layer-by-Layer Assembled Nano-Composite Multilayer Gas Barrier Film Manufactured with Stretchable Substrate

Applied Sciences ◽

10.3390/app11135794 ◽

2021 ◽

Vol 11 (13) ◽

pp. 5794

Author(s):

Se-Jung Kim ◽

Tanyoung Kim ◽

Dongsoo Kim ◽

Byeong-Kwon Ju

Keyword(s):

Transmission Rate ◽

Significant Loss ◽

Light Transmittance ◽

Poly Vinyl Alcohol ◽

Layer By Layer ◽

Gas Barrier ◽

Nano Composite ◽

Barrier Films ◽

Potential Applications ◽

Barrier Film

Most gas barrier films produce cracks that lead to a significant loss of gas barrier integrity when strain is applied. In order to fabricate stretchable gas barrier films with low water permeability and high endurance after stretching, we used polydiallydimethylammonium (PDDA) mixed with graphene oxide (GO) and poly (vinyl alcohol) (PVA) mixed with montmorillonite (MMT). These films were manufactured by layer-by-layer assembly on an Ecoflex/polydimethylsiloxane (PDMS) substrate with pre-strain applied. A total of 30 layers of PDDA (GO)/PVA (MMT) coated on the substrate exhibited a low water vapor transmission rate of 2.5 × 10−2 g/m2 day after 100 cycles of stretching (30% strain). In addition, they exhibited a high light transmittance of 86.54%. Thus, the prepared stretchable gas barrier film has potential applications as a barrier film in transparent and stretchable electronic devices.

Download Full-text

Two-dimensional optical scanner with large angular rotation realized by self-assembled micro-elevator

1998 IEEE/LEOS Summer Topical Meeting. Digest. Broadband Optical Networks and Technologies: An Emerging Reality. Optical MEMS. Smart Pixels. Organic Optics and Optoelectronics (Cat. No.98TH8369) ◽

10.1109/leosst.1998.689857 ◽

2002 ◽

Cited By ~ 11

Author(s):

L. Fan ◽

M.C. Wu

Keyword(s):

Two Dimensional ◽

Angular Rotation ◽

Optical Scanner ◽

Self Assembled

Download Full-text

Self-assembled two-dimensional nanoporous molecular arrays and photoinduced polymerization of 4-bromo-4′-hydroxybiphenyl on Ag(111)

The Journal of Chemical Physics ◽

10.1063/1.4906116 ◽

2015 ◽

Vol 142 (10) ◽

pp. 101902 ◽

Cited By ~ 14

Author(s):

Qian Shen ◽

Jing Hui He ◽

Jia Lin Zhang ◽

Kai Wu ◽

Guo Qin Xu ◽

...

Keyword(s):

Two Dimensional ◽

Photoinduced Polymerization ◽

Self Assembled

Download Full-text

Cellulose Nanocrystal (CNC) Coatings with Controlled Anisotropy as High-Performance Gas Barrier Films

ACS Applied Materials & Interfaces ◽

10.1021/acsami.8b16897 ◽

2018 ◽

Vol 11 (1) ◽

pp. 1376-1383 ◽

Cited By ~ 22

Author(s):

Reaz A. Chowdhury ◽

Md. Nuruddin ◽

Caitlyn Clarkson ◽

Francisco Montes ◽

John Howarter ◽

...

Keyword(s):

High Performance ◽

Cellulose Nanocrystal ◽

Gas Barrier ◽

Barrier Films

Download Full-text

Square-grid coordination networks of (5,10,15,20-tetra-4-pyridylporphyrinato)zinc(II) in its clathrate with two guest molecules of 1,2-dichlorobenzene: supramolecular isomerism of the porphyrin self-assembly

Acta Crystallographica Section C Crystal Structure Communications ◽

10.1107/s0108270109005691 ◽

2009 ◽

Vol 65 (3) ◽

pp. m139-m142 ◽

Cited By ~ 10

Author(s):

Rajesh Koner ◽

Israel Goldberg

Keyword(s):

Self Assembly ◽

Metal Ion ◽

Three Dimensional ◽

Two Dimensional ◽

Coordination Networks ◽

Guest Molecules ◽

Square Grid ◽

Supramolecular Isomerism ◽

Self Assembled ◽

Solvent Molecules

The title compound, (5,10,15,20-tetra-4-pyridylporphyrinato)zinc(II) 1,2-dichlorobenzene disolvate, [Zn(C40H24N8)]·2C6H4Cl2, contains a clathrate-type structure. It is composed of two-dimensional square-grid coordination networks of the self-assembled porphyrin moiety, which are stacked one on top of the other in a parallel manner. The interporphyrin cavities of the overlapping networks combine into channel voids accommodated by the dichlorobenzene solvent. Molecules of the porphyrin complex are located on crystallographic inversion centres. The observed two-dimensional assembly mode of the porphyrin units represents a supramolecular isomer of the unique three-dimensional coordination frameworks of the same porphyrin building block observed earlier. The significance of this study lies in the discovery of an additional supramolecular isomer of the rarely observed structures of metalloporphyrins self-assembled directly into extended coordination polymers without the use of external ligand or metal ion auxiliaries.

Download Full-text