Linear arrays of quantum dots are predicted to show localization effects for light traveling along the linear dimension quite similar to the case of the Anderson localization phenomenon known for electron transport. A basic requirement is to have stable arrays of such quantum dots at hand that might be incorporated into potential devices. To prepare such linear arrays, we dispersed ZnSe quantum dots in a polymer solution and used this solution in a first approach to electrospin polymer nanofibers from this solution using polystyrene and polylactide as polymer matrix. Nanofibers with quantum dots with dimensions ranging from several 100 nm to about 10 nm were achieved in this way. Using frame type and cylindrical rotating electrodes, an enhanced mutual orientation of these fibers was achieved. In a second approach, we used the wetting assisted template approach based on porous alumina templates to obtain parallel sets of polystyrene nanorods containing quantum dots.

Aromatic/aliphatic copolyesters containing hydrophilic moieties in the main chain or side chain were synthesized by bulk polycondensation of aromatic monomers without or with solubilizing substituents and aliphatic monomers. Hydrolytic and enzymatic degradation studies were carried out in vitro at 37 degrees C in pH 7.4 phosphate buffer and in Tris-HCl buffer containing proteinase K. The results indicate that liquid-crystalline aromatic/aliphatic copolyesters are degradable hydrolytically as well as enzymatically. The change in composition and morphology of the polyester films were monitored by nuclear magnetic resonance and scanning electron microscopy. The results suggested that aromatic species and aliphatic moieties could be released into aqueous solution during hydrolytic degradation of aromatic/aliphatic copolyesters with ethyleneoxy groups on the side chain. Modifying aromatic species with hydrophilic groups in aromatic/aliphatic copolyesters was an efficient method to improve degradability and biocompatibility due to improved solubility of degradation products in aqueous solution. Mechanical tests indicated that the copolyesters exhibited good mechanical properties prior to degradation, which can be of relevance for bone tissue engineering.

Poly-L-lactide (PLA) fibers were obtained by electrospinning of PLA / dichloromethane solutions. Formation of beaded fibers combined with decreased fiber diameters were observed for low PLA concentrations in solution. Increase of the electrical conductivity by addition of pyridinium formiate (PF) caused a significant reduction of bead formation. The electrospinning of dilute PLA / PF / dichloromethane solutions resulted in PLA nanofibers. Systematic variations clearly identified the solution viscosity and the electrical conductivity at otherwise fixed parameters (surface tension, molecular weight, electrode geometry, electrical field, etc.) as crucial parameters for the formation of beads upon electrospinning of PLA dichloromethane solutions.

ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTPoly(p-xylylene) Nanotubes by Coating and Removal of Ultrathin Polymer Template FibersHaoqing Hou, Zeng Jun, Arndt Reuning, Andreas Schaper, Joachim H. Wendorff, and Andreas GreinerView Author Information Philipps-University Marburg, Department of Chemistry, Institute of Physical Chemistry, Nuclear Chemistry, and Macromolecular Chemistry and Scientific Center for Materials Science, Department of Geosciences, Hans-Meerwein-Str., D-35032 Marburg, Germany Cite this: Macromolecules 2002, 35, 7, 2429–2431Publication Date (Web):February 28, 2002Publication History Received10 September 2001Revised14 January 2002Published online28 February 2002Published inissue 1 March 2002https://doi.org/10.1021/ma011607iCopyright © 2002 American Chemical SocietyRIGHTS & PERMISSIONSArticle Views1801Altmetric-Citations172LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit Read OnlinePDF (353 KB) Get e-AlertsSUBJECTS:Biopolymers,Fibers,Genetics,Organic polymers,Plastics Get e-Alerts

Structured polymer fibers with diameters down to tens of nanometers are of interest for applications in filters, in composite reinforcement, or as templates for the preparation of functional nanotubes. The Figure shows fibers of poly-L-lactide produced by electrospinning from a dichloromethane solution exhibiting regular pores or pits in the 100 nm range.

The aim was to prepare fibers with diameters below the micrometer range characterized by specific bulk morphologies and surface topologies. Such materials are of interest for various applications including reinforcement, sensors or filtration as well as the formation of functional tubes by the use of fiber templates. We were able to manufacture highly structured submicrometer fibers by electrospinning from ternary solutions using polylactide (PLA) and polyvinylpyrrolidone (PVP) as polymer model components. Co-continuous phase morphologies resulted from phase separation processes taking place during fiber formation. In a subsequent step, specific surface topologies or fine pores were generated by selective removal of one of the components.

Advanced MaterialsVolume 12, Issue 9 p. 637-640 Communication Polymer, Metal, and Hybrid Nano- and Mesotubes by Coating Degradable Polymer Template Fibers (TUFT Process) M. Bognitzki, M. Bognitzki Department of Chemistry & Materials Science Center, Institute of Physical Chemistry, Nuclear Chemistry, and Macromolecular Chemistry, Philipps University Marburg, Hans-Meerwein-Strasse, D-35032 Marburg (Germany)Search for more papers by this authorH. Hou, H. Hou FB Chemie und Pharmazie, Institut für Organische Chemie, Johannes Gutenberg Universität Mainz, Duesbergweg 10–14, D-55099 Mainz (Germany) Department of Chemistry & Materials Science Center, Institute of Physical Chemistry, Nuclear Chemistry, and Macromolecular Chemistry, Philipps University Marburg, Hans-Meerwein-Strasse, D-35032 Marburg (Germany)Search for more papers by this authorM. Ishaque, M. Ishaque Department of Chemistry & Materials Science Center, Institute of Physical Chemistry, Nuclear Chemistry, and Macromolecular Chemistry, Philipps University Marburg, Hans-Meerwein-Strasse, D-35032 Marburg (Germany)Search for more papers by this authorT. Frese, T. Frese Department of Chemistry & Materials Science Center, Institute of Physical Chemistry, Nuclear Chemistry, and Macromolecular Chemistry, Philipps University Marburg, Hans-Meerwein-Strasse, D-35032 Marburg (Germany)Search for more papers by this authorM. Hellwig, M. Hellwig Department of Chemistry & Materials Science Center, Institute of Physical Chemistry, Nuclear Chemistry, and Macromolecular Chemistry, Philipps University Marburg, Hans-Meerwein-Strasse, D-35032 Marburg (Germany)Search for more papers by this authorC. Schwarte, C. Schwarte Department of Chemistry & Materials Science Center, Institute of Physical Chemistry, Nuclear Chemistry, and Macromolecular Chemistry, Philipps University Marburg, Hans-Meerwein-Strasse, D-35032 Marburg (Germany)Search for more papers by this authorA. Schaper, A. Schaper Department of Chemistry & Materials Science Center, Institute of Physical Chemistry, Nuclear Chemistry, and Macromolecular Chemistry, Philipps University Marburg, Hans-Meerwein-Strasse, D-35032 Marburg (Germany)Search for more papers by this authorJ. H. Wendorff, J. H. Wendorff Department of Chemistry & Materials Science Center, Institute of Physical Chemistry, Nuclear Chemistry, and Macromolecular Chemistry, Philipps University Marburg, Hans-Meerwein-Strasse, D-35032 Marburg (Germany)Search for more papers by this authorA. Greiner, A. Greiner FB Chemie und Pharmazie, Institut für Organische Chemie, Johannes Gutenberg Universität Mainz, Duesbergweg 10–14, D-55099 Mainz (Germany) Department of Chemistry & Materials Science Center, Institute of Physical Chemistry, Nuclear Chemistry, and Macromolecular Chemistry, Philipps University Marburg, Hans-Meerwein-Strasse, D-35032 Marburg (Germany)Search for more papers by this author M. Bognitzki, M. Bognitzki Department of Chemistry & Materials Science Center, Institute of Physical Chemistry, Nuclear Chemistry, and Macromolecular Chemistry, Philipps University Marburg, Hans-Meerwein-Strasse, D-35032 Marburg (Germany)Search for more papers by this authorH. Hou, H. Hou FB Chemie und Pharmazie, Institut für Organische Chemie, Johannes Gutenberg Universität Mainz, Duesbergweg 10–14, D-55099 Mainz (Germany) Department of Chemistry & Materials Science Center, Institute of Physical Chemistry, Nuclear Chemistry, and Macromolecular Chemistry, Philipps University Marburg, Hans-Meerwein-Strasse, D-35032 Marburg (Germany)Search for more papers by this authorM. Ishaque, M. Ishaque Department of Chemistry & Materials Science Center, Institute of Physical Chemistry, Nuclear Chemistry, and Macromolecular Chemistry, Philipps University Marburg, Hans-Meerwein-Strasse, D-35032 Marburg (Germany)Search for more papers by this authorT. Frese, T. Frese Department of Chemistry & Materials Science Center, Institute of Physical Chemistry, Nuclear Chemistry, and Macromolecular Chemistry, Philipps University Marburg, Hans-Meerwein-Strasse, D-35032 Marburg (Germany)Search for more papers by this authorM. Hellwig, M. Hellwig Department of Chemistry & Materials Science Center, Institute of Physical Chemistry, Nuclear Chemistry, and Macromolecular Chemistry, Philipps University Marburg, Hans-Meerwein-Strasse, D-35032 Marburg (Germany)Search for more papers by this authorC. Schwarte, C. Schwarte Department of Chemistry & Materials Science Center, Institute of Physical Chemistry, Nuclear Chemistry, and Macromolecular Chemistry, Philipps University Marburg, Hans-Meerwein-Strasse, D-35032 Marburg (Germany)Search for more papers by this authorA. Schaper, A. Schaper Department of Chemistry & Materials Science Center, Institute of Physical Chemistry, Nuclear Chemistry, and Macromolecular Chemistry, Philipps University Marburg, Hans-Meerwein-Strasse, D-35032 Marburg (Germany)Search for more papers by this authorJ. H. Wendorff, J. H. Wendorff Department of Chemistry & Materials Science Center, Institute of Physical Chemistry, Nuclear Chemistry, and Macromolecular Chemistry, Philipps University Marburg, Hans-Meerwein-Strasse, D-35032 Marburg (Germany)Search for more papers by this authorA. Greiner, A. Greiner FB Chemie und Pharmazie, Institut für Organische Chemie, Johannes Gutenberg Universität Mainz, Duesbergweg 10–14, D-55099 Mainz (Germany) Department of Chemistry & Materials Science Center, Institute of Physical Chemistry, Nuclear Chemistry, and Macromolecular Chemistry, Philipps University Marburg, Hans-Meerwein-Strasse, D-35032 Marburg (Germany)Search for more papers by this author First published: 17 April 2000 https://doi.org/10.1002/(SICI)1521-4095(200005)12:9<637::AID-ADMA637>3.0.CO;2-WCitations: 352AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Abstract Coating extremely thin degradable template polymer fibers with the desired wall materials forms the basis of the straightforward and highly versatile method described here for the production of polymer, metal, and hybrid nano- and mesotubes. Tubes with highly structured inner surfaces (see Figure) may be fabricated, which is of great interest for applications requiring large surface/volume ratios (see also cover). Citing Literature Volume12, Issue9May, 2000Pages 637-640 RelatedInformation

High molecular weight liquid crystalline copolyesters were obtained by copolycondensation of aromatic diols and diacyl chlorides with oligolactides. The molecular structure of these copolyesters was verified by NMR studies. The copolyesters form nematic melts, which can be frozen in into a nematic glass. Unexpectedly, a fibrillar structure was observed exclusively on the surface of solution cast films. In spite of a significant content of lactide moieties of the copolyesters their films and fibers are characterized by exceptional mechanical properties. Initial experiments indicated excellent biocompatibility based on cell seeding experiments and microscopic evidence.