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Engineering function into viruses, vesicles, and gels for unique supramolecular nanomaterials
( Justyn Jaworski ) 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Soft matter, such as gels, liquid crystals, polymer/biopolymers, and membranes, are ubiquitous throughout nature and have many important industrial applications. The most familiar are plastics, paints, foods, and display technologies. A key feature of these systems is their complex self-organization that is generally held together through weak intermolecular forces such as hydrogen bonds, pi-pi stacking interactions, or through the hydrophobic effect. In this presentation, I will discuss how we used these same driving forces to both develop new designs and exploit existing structures for realizing unique supramolecular nanomaterials. Features of our systems include stimuli-responsive behavior, tunable structures, reversible phase transition, controllable shape changes, chemical sensing, as well as actuation. Applications of this work are expected in a range of areas including separation and detection among others. In addition, I will highlight some of our recent advances in moving past traditional self-assembled systems and into guided assembly approaches for the development of an even wider variety of new soft matter composites.
Yarimaga, Oktay,Jaworski, Justyn,Yoon, Bora,Kim, Jong-Man The Royal Society of Chemistry 2012 Chemical communications Vol.48 No.19
<P>While a large variety of conjugated polymers exist, polydiacetylenes (PDAs) remain a major research area among scientists due to their interesting optical, spectral, electronic, and structural properties. Heavily reviewed in regards to their stimuli responsive properties, much is known about the assortment of sensing and detection capabilities of PDAs. In this article, we look more upon the structural diversities of polydiacetylenes that have been achieved in recent years, particularly from a hierarchical perspective of 1, 2, and 3-dimensional configurations. In addition, we examine how these different dimensional arrangements of PDAs have heralded clear applications in several key areas. Successful integration of these stimuli-responsive “smart” materials into various geometries has required researchers to have a comprehensive understanding of both the fabrication and synthesis processes, as well as the signalling mechanism for the optical, fluorogenic or spectral transitions. The on-going discovery of new PDA formulations continues to provide interesting structural manifestations such as liposomes, tubes, fibres, organic/inorganic incorporated hybrids and composite structures. By highlighting some of the recent conceptual and technological developments, we hope to provide a measure of the current pace in new PDA derivative development as core components in efficient sensor, imaging and display systems.</P> <P>Graphic Abstract</P><P>Recent advances in polydiacetylene based sensing, imaging, and display technologies are examined from a morphological perspective, as these stimuli responsive materials have shown the ability to adopt a range of useful and interesting confirmations by self-assembly and patterning. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cc17441c'> </P>
Lee, Ji Ha,Jaworski, Justyn,Jung, Jong Hwa RSC Pub 2013 Nanoscale Vol.5 No.18
<P>Achieving both high specificity and sensitivity are essential for gas phase chemical detection systems. Recent implementation of Metal-Organic Frameworks (MOFs) have shown great success in separation and storage systems for specific gas molecules. By implementing a MOF structure comprised of Zn(2+) coordinated trans-stilbene derivatives, a gas responsive material has been created which exhibits a high photoluminescence quantum yield, offering new opportunities for chemical sensors. Here, we reveal a nanocomposite material, assembled from azobenzene functionalized graphene oxide and stilbene-MOF, that is capable of luminescent quenching by explosive gases. This unique system displays selectivity to dinitrotoluene (71% quenching) over trinitrotoluene (20% quenching) with sub ppm sensitivity and response times of less than a minute. We show that this implementation of a graphene-based MOF composite provides a unique strategy in the development of molecularly well-defined materials having rapid, reversible, and gas selective fluorescent quenching capabilities. This opens the way for new advances in the assembly of low density frameworks using isomerization suppressed materials.</P>