scholarly journals Polymeric nanoporous materials fabricated with supercritical CO2 and CO2-expanded liquids

2014 ◽  
Vol 43 (20) ◽  
pp. 6938-6953 ◽  
Author(s):  
Aijuan Zhang ◽  
Qingkun Zhang ◽  
Hua Bai ◽  
Lei Li ◽  
Jun Li
Keyword(s):  
Supercritical Co2 ◽  
Recent Progress ◽  
Polymeric Materials ◽  
Nanoporous Materials

This tutorial review focuses on the recent progress in nanoporous polymeric materials fabricated by newly developed supercritical techniques.

scholarly journals Recent Progress in Polysaccharide Aerogels: Their Synthesis, Application, and Future Outlook

Polymers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1347
Author(s):  
Arbanah Muhammad ◽  
Dabin Lee ◽  
Yonghun Shin ◽  
Juhyun Park
Keyword(s):  
Drug Delivery ◽  
Supercritical Co2 ◽  
Wound Dressing ◽  
Freeze Drying ◽  
Recent Progress ◽  
Present Review ◽  
Porous Structures ◽  
Air Filtration ◽  
Future Outlook ◽  
Synthetic Process

Porous polysaccharides have recently attracted attention due to their porosity, abundance, and excellent properties such as sustainability and biocompatibility, thereby resulting in their numerous applications. Recent years have seen a rise in the number of studies on the utilization of polysaccharides such as cellulose, chitosan, chitin, and starch as aerogels due to their unique performance for the fabrication of porous structures. The present review explores recent progress in porous polysaccharides, particularly cellulose and chitosan, including their synthesis, application, and future outlook. Since the synthetic process is an important aspect of aerogel formation, particularly during the drying step, the process is reviewed in some detail, and a comparison is drawn between the supercritical CO2 and freeze drying processes in order to understand the aerogel formation of porous polysaccharides. Finally, the current applications of polysaccharide aerogels in drug delivery, wastewater, wound dressing, and air filtration are explored, and the limitations and outlook of the porous aerogels are discussed with respect to their future commercialization.

3D printing of active polymeric materials

2019 ◽  
Author(s):  
◽  
Jheng-Wun Su
Keyword(s):  
Machine Learning ◽  
3D Printing ◽  
Flexible Electronics ◽  
Recent Progress ◽  
Polymeric Materials ◽  
Waterborne Polyurethane ◽  
Machine Learning Algorithms ◽  
4D Printing ◽  
Active Materials ◽  
3D Structures

[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] Learning from nature livings, especially those that can respond to the stimuli and change the shape, is attracting increasing interests in a wide variety of research fields. There is a significant need of developing synthetic materials that can mimic these living systems to show dynamic and adaptive shape-changing functions. Although various fabrication methods including molding, micro-fabrication and photolithography have been developed to fabricate the dynamic materials, they all have shown some limits. At present, 3D printing is a promising technique, which provides a cost effective, accurate and customized method to form 3D structures. The recently new emerging technique, 4D printing, which employs the 3D printing to print the active materials for dynamic 3D structures, shows a great potential for various applications such as tissue engineering, flexible electronics, and soft robotics. Despite much recent progress, this technology and its application in 3D dynamic structure fabrication is still in its infancy. My Ph.D. dissertation focuses on 4D printing of programmable polymeric materials that exhibits complex, reversible, shape transformations as well as enriching the printable material library by exploring various active materials for 4D printing technology. Chapter 1 introduces the current development of active materials and methodologies. Much attention is paid to the recent progress and its merits and demerits. Chapter 2 presents a simple and inexpensive 4D printing of waterborne polyurethane paint (PU) composites that are fabricated by mixing PU with micro-size preswollen carboxymethyl cellulose (CMC) and silicon oxide nanoparticle (NPs), respectively. Chapter 3 presents the 4D printing of a commercial polymer, SU-8, which has yet been reported in this field. The self-morphing behaviors of the printed SU-8 structures are induced by spatial control of swelling medium inside the SU-8 matrix. In Chapter 4, machine learning algorithms are applied to evaluate the shape-morphing behaviors of 4D printed objects. After the model optimization by tuning the hyperparameters the obtained machine learning models enable to accurately predict the final curvatures and curving angles of the 4D printed SU-8 structures from given input geometrical information. This initial success show that these data-driven surrogate models can well circumvent the challenge of human centered trial-and-error process in optimizing the printed structures, thereby pushing the research in 4D printing to a new height.

Recent progress in conductive polymeric materials for biomedical applications

2019 ◽  
Vol 30 (12) ◽  
pp. 2932-2953 ◽  
Author(s):  
Sarita S. Nair ◽  
Sujeet K. Mishra ◽  
Devendra Kumar
Keyword(s):  
Biomedical Applications ◽  
Recent Progress ◽  
Polymeric Materials

Recent progress of atomic layer deposition on polymeric materials

2017 ◽  
Vol 70 ◽  
pp. 1182-1191 ◽  
Author(s):  
Hong Chen Guo ◽  
Enyi Ye ◽  
Zibiao Li ◽  
Ming-Yong Han ◽  
Xian Jun Loh
Keyword(s):  
Atomic Layer Deposition ◽  
Recent Progress ◽  
Polymeric Materials ◽  
Atomic Layer ◽  
Layer Deposition

scholarly journals RECENT PROGRESS IN STARCH-BASED POLYMERIC MATERIALS

2011 ◽  
Vol 011 (1) ◽  
pp. 24-37 ◽  
Author(s):  
Xiuli WANG ◽  
Yurong ZHANG ◽  
Yuzhong WANG
Keyword(s):  
Recent Progress ◽  
Polymeric Materials

scholarly journals Contactless Manipulation of Soft Robots

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3065 ◽  
Author(s):  
Kim ◽  
Park ◽  
Won ◽  
Jeon ◽  
Wie
Keyword(s):  
Recent Progress ◽  
Polymeric Materials ◽  
Anisotropic Materials ◽  
Robotic Systems ◽  
Soft Robots ◽  
Mechanical Joints ◽  
Potential Applications ◽  
Soft Actuators ◽  
External Stimuli ◽  
The Given

In recent years, jointless soft robots have demonstrated various curvilinear motions unlike conventional robotic systems requiring complex mechanical joints and electrical design principles. The materials employed to construct soft robots are mainly programmable anisotropic polymeric materials to achieve contactless manipulation of miniaturized and lightweight soft robots through their anisotropic strain responsivity to external stimuli. Although reviews on soft actuators are extensive, those on untethered soft robots are scant. In this study, we focus on the recent progress in the manipulation of untethered soft robots upon receiving external stimuli such as magnetic fields, light, humidity, and organic solvents. For each external stimulus, we provide an overview of the working principles along with the characteristics of programmable anisotropic materials and polymeric composites used in soft robotic systems. In addition, potential applications for untethered soft robots are discussed based on the physicochemical properties of programmable anisotropic materials for the given external stimuli.

Recent progress in 4D printing of stimuli-responsive polymeric materials

2019 ◽  
Vol 63 (4) ◽  
pp. 532-544 ◽  
Author(s):  
SuQian Ma ◽  
YunPeng Zhang ◽  
Meng Wang ◽  
YunHong Liang ◽  
Lei Ren ◽  
...  
Keyword(s):  
Recent Progress ◽  
Polymeric Materials ◽  
Stimuli Responsive ◽  
4D Printing

scholarly journals Recent Progress on Metal–Organic Framework and Its Derivatives as Novel Fire Retardants to Polymeric Materials

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Jing Zhang ◽  
Zhi Li ◽  
Xiao-Lin Qi ◽  
De-Yi Wang
Keyword(s):  
Recent Progress ◽  
Metal Organic Framework ◽  
Fire Retardant ◽  
Polymeric Materials ◽  
Metal Species ◽  
Fire Retardants ◽  
Fire Retardancy ◽  
Structure And Property ◽  
Future Design ◽  
Metal Organic

AbstractHigh flammability of polymers has become a major issue which has restricted its applications. Recently, highly crystalline materials and metal–organic frameworks (MOFs), which consisted of metal ions and organic linkers, have been intensively employed as novel fire retardants (FRs) for a variety of polymers (MOF/polymer). The MOFs possessed abundant transition metal species, fire-retardant elements and potential carbon source accompanied with the facile tuning of the structure and property, making MOF, its derivatives and MOF hybrids promising for fire retardancy research. The recent progress and strategies to prepare MOF-based FRs are emphasized and summarized. The fire retardancy mechanisms of MOF/polymer composites are explained, which may guide the future design for efficient MOF-based FRs. Finally, the challenges and prospects related to different MOF-based FRs are also discussed and aim to provide a fast and holistic overview, which is beneficial for researchers to quickly get up to speed with the latest development in this field.

Block-assembling: a new strategy for fabricating conductive nanoporous materials from nanocomposites based on a melt-miscible crystalline/crystalline blend and MWCNTs

2015 ◽  
Vol 3 (33) ◽  
pp. 8510-8518 ◽  
Author(s):  
Lijun Ye ◽  
Cuicui Ye ◽  
Xianchun Shi ◽  
Hongyan Zhao ◽  
Kangyuan Xie ◽  
...  
Keyword(s):  
Polymeric Materials ◽  
Nanoporous Materials ◽  
New Strategy

A “block-assembling” strategy is explored to fabricate conductive nanoporous polymeric materials with a unique interposition structure of CNTs in the inner wall of the internal pores.

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