Steven M. Howdle

One-pot controlled synthesis of biodegradable and biocompatible co-polymer micelles (2009)

Saeed, Aram Omer, Dey, Sabrina, Howdle, Steven M., Thurecht, Kristofer J., Alexander, Cameron

A facile route to biocompatible poly(lactic acid-co-glycolic acid)-co-poly(ethyleneglycolmethacrylate) (PLGA–PEGMA) block co-polymers is described utilising a combination of ring-opening...

Time and spectrally resolved enhanced fluorescence using silver nanoparticle impregnated polycarbonate substrates (2008)

Lagonigro, Laura, Peacock, Anna C., Rohrmoser, Stefan, Hasell, Tom, Howdle, Steven M., Sazio, Pier J.A., ...

Silver nanoparticle impregnated polycarbonate strips have been investigated as substrates for metal-enhanced photoluminescence of a blue emitting dye molecule (coumarin 102). By considering...

Ultra-high pressure MOCVD: a supercritical route to compound semiconductor materials (2008)

Wilson, James William, Yang, Jixin, Hyde, Jason R., Smith, David C., Howdle, Steven M., Mallik, Kanad, ...

The deposition of thin films of materials on to and in to preformed, high aspect ratio, template materials, is of significant interest to the semiconductor community. Damascene processes are vital to...

Dispersion Atom Transfer Radical Polymerization of vinyl monomers in supercritical carbon dioxide (2008)

Grignard, Bruno, Jérôme, Christine, Calberg, Cédric, Jérôme, Robert, Wang, Wenxin, Howdle, Steven M, ...

Controlled dispersion atom transfer radical polymerization (ATRP) of methyl methacrylate (MMA) was successfully carried out in supercritical carbon dioxide in the presence of aminated fluoropolymers....

Highly efficient surface enhanced Raman scattering using microstructured optical fibers with enhanced plasmonic interactions (2008)

Peacock, Anna.C., Amezcua-Correa, Adrian., Yang, Jixin, Sazio, Pier.J.A., Howdle, Steven.M.

Microstructured optical fibers "MOFs" represent a promising platform technology for fully integrated photonic-plasmonic devices. In this paper, we experimentally investigate the properties of two MOF...

Copper bromide complexed by fluorinated macroligands: towards microspheres by ATRP of vinyl monomers in scCO2 (2008)

Grignard, Bruno, Jérôme, Christine, Calberg, Cédric, Jérôme, Robert, Wang, Wenxing, Howdle, Steven M, ...

We report the successful synthesis of poly(methyl methacrylate) (PMMA) by atom transfer radical polymerization using a catalyst ligated to a polymeric ligand having a dual role, i.e., the...

Development of a slow non-viral DNA release system from PDLLA scaffolds fabricated using a supercritical CO2 technique (2007)

Heyde, Mieke, Partridge, Kris A., Howdle, Steven M., Oreffo, Richard O.C., Garnett, Martin C., Shakesheff, Kevin M.

Polyamidoamine polymers (PAA) comprising methylene-bisacrylamide/dimethylethylene-diamine monomers were synthesized, complexed with DNA and incorporated into porous P(DL)LA scaffolds by using a...

Gene therapy used for tissue engineering applications (2007)

Heyde, Mieke, Partridge, Kris A., Oreffo, Richard O.C., Howdle, Steven M., Shakesheff, Kevin M., Garnett, Martin C.

This review highlights the advances at the interface between tissue engineering and gene therapy. There are a large number of reports on gene therapy in tissue engineering, and these cover a huge...

Microscopic spacial effect on the dispersion polymerization in scCO2 (2007)

Yang, Jixin, Wang, Wenxin, Sazio, Pier J.A., Howdle, Steven M.

We report for the first time the microscopic spacial effect on the dispersion polymerization of methyl methacrylate (MMA) in supercritical carbon dioxide (scCO2). A variety of different-sized...

Microscopic spacial effect on the dispersion polymerization in scCO2 (2007)

Yang, Jixin, Wang, Wenxin, Sazio, Pier J.A., Howdle, Steven M.

We report for the first time the microscopic spacial effect on the dispersion polymerization of methyl methacrylate (MMA) in supercritical carbon dioxide (scCO). A variety of different-sized...

Novel one pot synthesis of silver nanoparticle–polymer composites by supercritical CO2 polymerisation in the presence of a RAFT agent (2007)

Hasell, Tom, Thurecht, Kristofer J., Jones, Rhys D. W., Brown, Paul D., Howdle, Steven M.

We report the one pot synthesis of a silver–polymer nanocomposite in supercritical carbon dioxide (scCO2) whereby an organometallic silver complex is thermally decomposed in the presence of a...

Supercritical CO2: an effective medium for the chemo-enzymatic synthesis of block copolymers (2007)

Villarroya, Silvia, Thurecht, Kristofer J., Heise, Andreas, Howdle, Steven M.

In this review, we describe the combination of enzymatic polymerisation and controlled free radical polymerisation in supercritical carbon dioxide. This combination facilitates the preparation of a...

GECO-DOSY Post-Processing Analysis of Polymers (2007)

Thurecht, Kristofer J., Howdle, Steven M., Davis, Adrienne L., Hyde, Jason R.

Generalized correlation diffusion ordered spectroscopy (GECO-DOSY) has been employed to increase the resolution of a more traditional DOSY experiment. We have compared purely linear polycaprolactone...

Novel one pot synthesis of silver nanoparticle–polymer composites by supercritical CO2 polymerisation in the presence of a RAFT agent (2007)

Hasell, Tom, Thurecht, Kristofer J., Jones, Rhys D. W., Brown, Paul D., Howdle, Steven M.

We report the one pot synthesis of a silver–polymer nanocomposite in supercritical carbon dioxide (scCO2) whereby an organometallic silver complex is thermally decomposed in the presence of a...

Supercritical CO2: an effective medium for the chemo-enzymatic synthesis of block copolymers (2007)

Villarroya, Silvia, Thurecht, Kristofer J., Heise, Andreas, Howdle, Steven M.

In this review, we describe the combination of enzymatic polymerisation and controlled free radical polymerisation in supercritical carbon dioxide. This combination facilitates the preparation of a...

GECO-DOSY Post-Processing Analysis of Polymers (2007)

Thurecht, Kristofer J., Howdle, Steven M., Davis, Adrienne L., Hyde, Jason R.

Generalized correlation diffusion ordered spectroscopy (GECO-DOSY) has been employed to increase the resolution of a more traditional DOSY experiment. We have compared purely linear polycaprolactone...

Surface enhanced Raman scattering using metal modified microstructured optical fiber substrates (2006)

Yang, Jixin, Amezcua-Correa, Adrian, Peacock, Anna C., Finlayson, Chris E., Baumberg, Jeremy J., Howdle, Steven M., ...

In this paper we report the fabrication of microstructured optical fibers (MOFs) metallic metamaterials using a bottom-up processing technique for surface enhanced Raman scattering (SERS)...

Mammalian cell survival and processing in supercritical CO(2) (2006)

Ginty, Patrick J., Howard, Daniel, Whitaker, Martin J., Barry, John J.A., Tighe, Patrick, ...

We demonstrate that mammalian cells can survive for 5 min within high-pressure CO(2)(.) Cell survival was investigated by exposing a range of mammalian cell types to supercritical CO(2) (scCO(2)) (35...

Mammalian cell survival and processing in supercritical CO2 (2006)

Ginty, Patrick J., Howard, Daniel, Whitaker, Martin J., Barry, John J.A., Tighe, Patrick, ...

We demonstrate that mammalian cells can survive for 5 min within high-pressure CO(2)(.) Cell survival was investigated by exposing a range of mammalian cell types to supercritical CO(2) (scCO(2)) (35...

Simultaneous Dynamic Kinetic Resolution in Combination with Enzymatic Ring-Opening Polymerization (2006)

Zhou, Jiaxiang, Wang, Wenxin, Thurecht, Kristofer J., Villarroya, Silvia, Howdle, Steven M.

We report the simultaneous dynamic kinetic resolution (DKR) of a secondary alcohol in combination with lipase-catalyzed ring-opening polymerization (ROP) of ε-caprolactone (ε-CL)....

One-Step Chemoenzymatic Synthesis of Poly(ε-caprolactone-block-methyl methacrylate) in Supercritical CO2 (2006)

Zhou, Jiaxiang, Villarroya, Silvia, Wang, Wenxin, Wyatt, Mark F., Duxbury, Christopher J., Thurecht, Kristofer J., ...

Enzymatic ring-opening polymerization (eROP) of ε-caprolactone (ε-CL) and atom-transfer radical polymerization (ATRP) of methyl methacrylate (MMA) were integrated into a one-step chemoenzymatic...

Simultaneous enzymatic ring opening polymerisation and RAFT-mediated polymerisation in supercritical CO2 (2006)

Thurecht, Kristofer J., Gregory, Andrew M., Villarroya, Silvia, Zhou, Jiaxiang, Heise, Andreas, Howdle, Steven M.

This report presents the first simultaneous, metal-free synthesis of block copolymers through combination of enzymatic ring-opening polymerisation of -caprolactone with RAFT-mediated controlled...

Kinetics of Enzymatic Ring-Opening Polymerization of ε-Caprolactone in Supercritical Carbon Dioxide (2006)

Thurecht, Kristofer J., Heise, Andreas, DeGeus, Matthijs, Villarroya, Silvia, Zhou, Jiaxiang, Wyatt, Mark F., ...

The kinetics of enzymatic ring-opening polymerization (eROP) of ε-caprolactone in supercritical carbon dioxide (scCO2) was investigated using a new, high-pressure sampling autoclave. The...

Synthesis of graft copolymers by the combination of ATRP and Enzymatic ROP in scC02 (2006)

Villarroya, Silvia, Zhou, Jiaxiang, Thurect, Kristofer J., Howdle, Steven M.

A simple strategy is reported for the synthesis of well-defined graft copolymers of poly(methyl methacrylate-co-2-hydroxyethyl methacrylate) P(MMA-co-HEMA) with poly(ε-caprolactone) (PCL) grafted...

Simultaneous Dynamic Kinetic Resolution in Combination with Enzymatic Ring-Opening Polymerization (2006)

Zhou, Jiaxiang, Wang, Wenxin, Thurecht, Kristofer J., Villarroya, Silvia, Howdle, Steven M.

We report the simultaneous dynamic kinetic resolution (DKR) of a secondary alcohol in combination with lipase-catalyzed ring-opening polymerization (ROP) of ε-caprolactone (ε-CL)....

One-Step Chemoenzymatic Synthesis of Poly(ε-caprolactone-block-methyl methacrylate) in Supercritical CO2 (2006)

Zhou, Jiaxiang, Villarroya, Silvia, Wang, Wenxin, Wyatt, Mark F., Duxbury, Christopher J., Thurecht, Kristofer J., ...

Enzymatic ring-opening polymerization (eROP) of ε-caprolactone (ε-CL) and atom-transfer radical polymerization (ATRP) of methyl methacrylate (MMA) were integrated into a one-step chemoenzymatic...

Simultaneous enzymatic ring opening polymerisation and RAFT-mediated polymerisation in supercritical CO2 (2006)

Thurecht, Kristofer J., Gregory, Andrew M., Villarroya, Silvia, Zhou, Jiaxiang, Heise, Andreas, Howdle, Steven M.

This report presents the first simultaneous, metal-free synthesis of block copolymers through combination of enzymatic ring-opening polymerisation of -caprolactone with RAFT-mediated controlled...

Kinetics of Enzymatic Ring-Opening Polymerization of ε-Caprolactone in Supercritical Carbon Dioxide (2006)

Thurecht, Kristofer J., Heise, Andreas, DeGeus, Matthijs, Villarroya, Silvia, Zhou, Jiaxiang, Wyatt, Mark F., ...

The kinetics of enzymatic ring-opening polymerization (eROP) of ε-caprolactone in supercritical carbon dioxide (scCO2) was investigated using a new, high-pressure sampling autoclave. The...

Synthesis of graft copolymers by the combination of ATRP and Enzymatic ROP in scC02 (2006)

Villarroya, Silvia, Zhou, Jiaxiang, Thurect, Kristofer J., Howdle, Steven M.

A simple strategy is reported for the synthesis of well-defined graft copolymers of poly(methyl methacrylate-co-2-hydroxyethyl methacrylate) P(MMA-co-HEMA) with poly(ε-caprolactone) (PCL) grafted...

Human osteoprogenitor bone formation using encapsulated bone morphogenetic protein 2 in porous polymer scaffolds (2004)

Yang, Xuebin B., Whitaker, Martin J., Sebald, Walter, Clarke, Nicholas, Howdle, Steven M., Shakesheff, Kevin M., ...

The ability to deliver, over time, biologically active osteogenic growth factors by means of designed scaffolds to sites of tissue regeneration offers tremendous therapeutic opportunities in a...

Silver nanoparticles and polymeric medical devices: a new approach to prevention of infection? (2004)

Furno, Franck, Morley, Kelly S., Wong, Ben, Sharp, Barry L., Arnold, Polly L., Howdle, Steven M., ...

Objectives: Implantable devices are major risk factors for hospital-acquired infection. Biomaterials coated with silver oxide or silver alloy have all been used in attempts to reduce infection, in...

Silver nanoparticles and polymeric medical devices: a new approach to prevention of infection? (2004)

Furno, Franck, Morley, Kelly S., Wong, Ben, Sharp, Barry L., Arnold, Polly L., Howdle, Steven M., ...

Objectives: Implantable devices are major risk factors for hospital-acquired infection. Biomaterials coated with silver oxide or silver alloy have all been used in attempts to reduce infection, in...

Charge transfer complex inimer: A facile route to dendritic materials (2003)

Wang, Wenxin, Yan, Deyue, Bratton, Daniel, Howdle, Steven M, Wang, Qiang, Lecomte, Philippe

A versatile approach to the preparation of hyperbranched polymers, in which an inimer is used to assemble a charge transfer complex (CTC) with conventional vinyl monomers, is reported. A novel...

Induction of human osteoprogenitor chemotaxis, proliferation, differentiation, and bone formation by osteoblast stimulating factor-1/pleiotrophin: osteoconductive biomimetic scaffolds for tissue engineering (2003)

Yang, Xuebin, Tare, Rahul S., Partridge, Kris A., Roach, Helmtrud, Clarke, Nicholas M.P., Howdle, Steven M., ...

The process of bone growth, regeneration, and remodeling is mediated, in part, by the immediate cell-matrix environment. Osteoblast stimulating factor-1 (OSF-1), more commonly known as pleiotrophin...

Immunoselection and adenoviral genetic modulation of human osteoprogenitors: in vivo bone formation on PLA scaffold (2002)

Howard, Daniel, Partridge, Kris, Yang, Xuebin, Clarke, Nicholas M.P., Okubo, Yasunori, Bessho, Kazuhisa, ...

The aim of this study was to examine the potential of immunoselected genetically modified human osteoprogenitors to form bone in vivo on porous PLA scaffolds. Human osteoprogenitors from bone marrow...

Adenoviral BMP-2 gene transfer in mesenchymal stem cells: in vitro and in vivo bone formation on biodegradable polymer scaffolds (2002)

Partridge, Kris, Yang, Xuebin, Clarke, Nicholas M.P., Okubo, Yasunori, Bessho, Kazuhisa, Sebald, Walter, ...

The aim of this study was to determine the feasibility of adenoviral gene transfer into primary human bone marrow osteoprogenitor cells in combination with biodegradeable scaffolds to tissue-engineer...

Mammalian cell survival and processing in supercritical CO2

Ginty, Patrick J., Howard, Daniel, Whitaker, Martin J., Barry, John J. A., Tighe, Patrick, ...

We demonstrate that mammalian cells can survive for 5 min within high-pressure CO2. Cell survival was investigated by exposing a range of mammalian cell types to supercritical CO2 (scCO2) (35°C, 74...

Mammalian cell survival and processing in supercritical CO2

Ginty, Patrick J., Howard, Daniel, Whitaker, Martin J., Barry, John J. A., Tighe, Patrick, ...

We demonstrate that mammalian cells can survive for 5 min within high-pressure CO2. Cell survival was investigated by exposing a range of mammalian cell types to supercritical CO2 (scCO2) (35°C, 74...

Supercritical carbon dioxide: putting the fizz into biomaterials

Barry, John J.A., Popov, Vladimir K., Shakesheff, Kevin M., Howdle, Steven M.

This paper describes recent progress made in the use of high pressure or supercritical fluids to process polymers into three-dimensional tissue engineering scaffolds. Three current examples are...