Diphenylacetylene Polymer Nanofiber Mats Fabricated by Freeze Drying: Preparation and Application for Explosive Sensors

2010 ◽  
Vol 211 (17) ◽  
pp. 1900-1908 ◽  
Author(s):  
Wang-Eun Lee ◽  
Chang-Jin Oh ◽  
Inn-Kyu Kang ◽  
Giseop Kwak
Keyword(s):  
Freeze Drying ◽  
Polymer Nanofiber ◽  
Explosive Sensors ◽  
Nanofiber Mats

scholarly journals Electrospinning on 3D Printed Polymers for Mechanically Stabilized Filter Composites

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2034 ◽  
Author(s):  
Tomasz Kozior ◽  
Al Mamun ◽  
Marah Trabelsi ◽  
Martin Wortmann ◽  
Sabantina Lilia ◽  
...  
Keyword(s):  
3D Printing ◽  
Thermoplastic Polyurethane ◽  
High Surface ◽  
Antimicrobial Properties ◽  
Mechanical Damage ◽  
Volume Ratio ◽  
Electrospun Nanofiber ◽  
Polymer Nanofiber ◽  
3D Printed ◽  
Nanofiber Mats

Electrospinning is a frequently used method to prepare air and water filters. Electrospun nanofiber mats can have very small pores, allowing for filtering of even the smallest particles or molecules. In addition, their high surface-to-volume ratio allows for the integration of materials which may additionally treat the filtered material through photo-degradation, possess antimicrobial properties, etc., thus enhancing their applicability. However, the fine nanofiber mats are prone to mechanical damage. Possible solutions include reinforcement by embedding them in composites or gluing them onto layers that are more mechanically stable. In a previous study, we showed that it is generally possible to stabilize electrospun nanofiber mats by 3D printing rigid polymer layers onto them. Since this procedure is not technically easy and needs some experience to avoid delamination as well as damaging the nanofiber mat by the hot nozzle, here we report on the reversed technique (i.e., first 3D printing a rigid scaffold and subsequently electrospinning the nanofiber mat on top of it). We show that, although the adhesion between both materials is insufficient in the case of a common rigid printing polymer, nanofiber mats show strong adhesion to 3D printed scaffolds from thermoplastic polyurethane (TPU). This paves the way to a second approach of combining 3D printing and electrospinning in order to prepare mechanically stable filters with a nanofibrous surface.

Surface-enhanced Raman scattering (SERS) chips made from metal nanoparticle-doped polymer fibers

RSC Advances ◽  
2014 ◽  
Vol 4 (45) ◽  
pp. 23838-23845 ◽  
Author(s):  
Wenran Gao ◽  
Gang Chen ◽  
Weiqing Xu ◽  
Chenggong Yang ◽  
Shuping Xu
Keyword(s):  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Metal Nanoparticle ◽  
Microfluidic Channels ◽  
Polymer Nanofiber ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Nanofiber Mats ◽  
Doped Polymer

We employed an electrospinning method to prepare metal nanoparticle (NP) doped polymer nanofiber mats, which can be easily cut to size and fixed on slides or in microfluidic channels for surface-enhanced Raman scattering (SERS) measurements.

Hydrodynamics of Drop Impact and Spray Cooling through Nanofiber Mats

2010 ◽  
Vol 4 (1) ◽  
Author(s):  
Y. Chan ◽  
F. Charbel ◽  
S.S. Ray ◽  
A.L. Yarin
Keyword(s):  
Heat Flux ◽  
Thermal Management ◽  
Spray Cooling ◽  
Copper Plate ◽  
Flux Rate ◽  
Heat Transfer Characteristics ◽  
Nickel Copper ◽  
Polymer Nanofiber ◽  
Nanofiber Mats ◽  
Hot Surface

Spray cooling is one of the effective technologies has been promised for the thermal management of microelectronic systems and server rooms. The focus of this research is to increase the heat flux rate from a hot surface by applying a metal-coated electrospun polymer nanofiber mat. Samples were prepared from copper plate substrate coated with electrospun polymer nanofiber mat and electroplated with one of three different metals: nickel, copper and silver. Experiments were performed in which samples were subjected to impacting water droplets from a height of 17.95cm at various temperatures. The behaviors of droplet impact and subsequent evaporation were observed in order to evaluate and compare heat transfer characteristics of the different sample types. Silver-plated samples were found to provide the highest heat flux rate, followed by copper and then nickel. However, silver was not usable at higher temperatures due to its tendency to oxidize and degrade easily.

scholarly journals Multi-Nozzle Electrospinning Process to Fabricate Uniform Polymer Nanofiber Mats

2018 ◽  
Vol 17 (3) ◽  
pp. 120-126
Author(s):  
Bong-Kee Lee ◽  
◽  
Jae-Han Park ◽  
Geon-Jung Park ◽  
Kwang-Ryun Park
Keyword(s):  
Electrospinning Process ◽  
Polymer Nanofiber ◽  
Nanofiber Mats

Micropatterned Polythiophene Nanofibers via Electrostatic Spinning and Photolithography

2006 ◽  
Vol 948 ◽  
Author(s):  
Chris Ik Asemota ◽  
Arvind Kumar ◽  
Gregory A Sotzing
Keyword(s):  
Solid State ◽  
Conducting Polymers ◽  
Conducting Polymer ◽  
Polymer Fibers ◽  
Electrostatic Spinning ◽  
Polymer Nanofiber ◽  
Display Technology ◽  
Nanofiber Mats

ABSTRACTHerein we report the patterning of large conducting polymer nanofiber mats of the polyterthiophene precursor, into regular micron scale arrays of smaller mats each of which has the potential of being independently addressed. These fiber grids, micro mats of conducting polymer fibers, were prepared by the combined techniques of electrospinning, soft photolithography, and solid state electrochemical crosslinking. The micro size mats are shown to retain their electrochromic behavior, subject to expected degradation in air as reported in the literature. Our contribution to the investigation of conducting polymers in display technology is oriented towards processibility and preparation of regular conducting polymer structures.

scholarly journals Nonisothermal drop impact and evaporation on polymer nanofiber mats

2011 ◽  
Vol 83 (3) ◽  
Author(s):  
Christina M. Weickgenannt ◽  
Yiyun Zhang ◽  
Andreas N. Lembach ◽  
Ilia V. Roisman ◽  
Tatiana Gambaryan-Roisman ◽  
...  
Keyword(s):  
Drop Impact ◽  
Polymer Nanofiber ◽  
Nanofiber Mats

Conducting polymer nanofiber mats via combination of electrospinning and oxidative polymerization

Polymer ◽  
2013 ◽  
Vol 54 (16) ◽  
pp. 4155-4160 ◽  
Author(s):  
Hongkwan Park ◽  
Sun Jong Lee ◽  
Seyul Kim ◽  
Hyun Woog Ryu ◽  
Seung Hwan Lee ◽  
...  
Keyword(s):  
Conducting Polymer ◽  
Oxidative Polymerization ◽  
Polymer Nanofiber ◽  
Nanofiber Mats

Ca-Histochemistry in slime mold plasmodia

1978 ◽  
Vol 36 (2) ◽  
pp. 130-131
Author(s):  
Ulrich Dierkes
Keyword(s):  
Physarum Polycephalum ◽  
Carbon Coating ◽  
Freeze Drying ◽  
Freeze Fracture ◽  
Freeze Substitution ◽  
Uranyl Acetate ◽  
Slime Mold ◽  
Staining Procedure ◽  
Protoplasmic Streaming ◽  
Intracellular Ca

Calcium is supposed to play an important role in the control of protoplasmic streaming in slime mold plasmodia. The motive force for protoplasmic streaming is generated by the interaction of actin and myosin. This contraction is supposed to be controlled by intracellular Ca-fluxes similar to the triggering system in skeleton muscle. The histochemical localisation of calcium however is problematic because of the possible diffusion artifacts especially in aquous media.To evaluate this problem calcium localisation was studied in small pieces of shock frozen (liquid propane at -189°C) plasmodial strands of Physarum polycephalum, which were further processed with 3 different methods: 1) freeze substitution in ethanol at -75°C, staining in 100% ethanol with 1% uranyl acetate, and embedding in styrene-methacrylate. For comparison the staining procedure was omitted in some preparations. 2)Freeze drying at about -95°C, followed by immersion with 100% ethanol containing 1% uranyl acetate, and embedding. 3) Freeze fracture, carbon coating and SEM investigation at temperatures below -100° C.

The Critical Point Drying Method Applied to Scanning Electron Microscopy of L-929 Cells

1970 ◽  
Vol 28 ◽  
pp. 278-279
Author(s):  
Charles TurnbiLL ◽  
Delbert E. Philpott
Keyword(s):  
Electron Microscopy ◽  
Carbon Dioxide ◽  
Surface Tension ◽  
Critical Point ◽  
Freeze Drying ◽  
Attractive Alternative ◽  
Crystal Formation ◽  
Critical Point Drying ◽  
Time Required ◽  
Scanning Electron

The advent of the scanning electron microscope (SCEM) has renewed interest in preparing specimens by avoiding the forces of surface tension. The present method of freeze drying by Boyde and Barger (1969) and Small and Marszalek (1969) does prevent surface tension but ice crystal formation and time required for pumping out the specimen to dryness has discouraged us. We believe an attractive alternative to freeze drying is the critical point method originated by Anderson (1951; for electron microscopy. He avoided surface tension effects during drying by first exchanging the specimen water with alcohol, amy L acetate and then with carbon dioxide. He then selected a specific temperature (36.5°C) and pressure (72 Atm.) at which carbon dioxide would pass from the liquid to the gaseous phase without the effect of surface tension This combination of temperature and, pressure is known as the "critical point" of the Liquid.

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