Browsing by Subject "polymer"

Article

A 1-D coordination polymer based on a Mn40 octagonal super-structure

Manoli, Maria; Inglis, R.; Manos, Manolis J.; Papaefstathìou, Giannis S.; Brechin, E. K.; Tasiopoulos, Anastasios J. (2013)

A 1-D coordination polymer, constructed using a combination of diols and phenolic oximes, contains a novel [Mn9] sub-unit, a nanosized [Mn40] octagonal super-structure and a [Mn21] repeating unit. © 2013 The Royal Society ...

Article

A novel QSPR model for predicting θ (lower critical solution temperature) in polymer solutions using molecular descriptors

Melagraki, G.; Afantitis, Antreas; Sarimveis, H.; Koutentis, Panayiotis Andreas; Markopoulos, J.; Igglessi-Markopoulou, O. (2007)

In this study, we present a new model that has been developed for the prediction of θ, (lower critical solution temperature) using a database of 169 data points that include 12 polymers and 67 solvents. For the characterization ...

Article

Adsorptive removal of U(VI) and Th(IV) from aqueous solutions using polymer-based electrospun PEO/PLLA fibrous membranes

Savva, Ioanna; Efstathiou, Maria; Krasia‐Christoforou, Theodora; Pashalidis, Ioannis (2013)

Fibrous membranes based on poly(ethylene oxide) and poly(l-lactide) fabricated by electrospinning were evaluated for the first time as substrates for the adsorption of tetravalent thorium (Th(IV)) and hexavalent uranium ...

Article

Adsorptive removal of U(VI) and Th(IV) from aqueous solutions using polymer-based electrospun PEO/PLLA fibrous membranes

Savva, I.; Efstathiou, M.; Krasia-Christoforou, T.; Pashalidis, I. (2013)

Fibrous membranes based on poly(ethylene oxide) and poly(l-lactide) fabricated by electrospinning were evaluated for the first time as substrates for the adsorption of tetravalent thorium (Th(IV)) and hexavalent uranium ...

Article

Amphiphilic diblock and ABC triblock methacrylate copolymers: Synthesis and aqueous solution characterization

Triftaridou, Aggeliki I.; Vamvakaki, Maria; Patrickios, Costas S. (2002)

Three isomeric, linear, equimolar, amphiphilic ABC triblock copolymers comprising methyl methacrylate (MMA, nonionic hydrophobic), 2-(dimethylamino)ethyl methacrylate, (DMAEMA, ionizable hydrophilic) and hexa(ethylene ...

Article

Amphiphilic single and double networks: a small-angle X-ray scattering investigation

Zhang, X. K.; Kyriakos, K.; Rikkou-Kalourkoti, Maria D.; Kitiri, E. N.; Patrickios, Costas S.; Papadakis, Christine M. (2016)

We investigated the microphase-separated morphologies of water-swollen amphiphilic single and double polymer networks using small-angle X-ray scattering (SAXS). The networks consist of (i) a first conetwork containing ...

Article

Analytical separations using molecular micelles in open-tubular capillary electrochromatography

Kapnissi‐Christodoulou, Constantina P.; Akbay, C.; Schlenoff, J. B.; Warner, I. M. (2002)

Open-tubular capillary electrochromatography (OT-CEC) is an alternative approach to conventional CEC. The primary advantage of OT-CEC is the elimination of problems associated with frits and silica particles in conventional ...

Article

Cationic amphiphilic model networks based on symmetrical ABCBA pentablock terpolymers: Synthesis, characterization, and modelling

Triftaridou, Aggeliki I.; Vamvakaki, Maria; Patrickios, Costas S. (2007)

Eight isomeric networks based on equimolar terpolymers were synthesized using group transfer polymerization (GTP) and were characterized in terms of their swelling properties. Two hydrophilic monomers, the nonionic methoxy ...

Article

Cationic homopolymer model networks and star polymers: Synthesis by group transfer polymerization and characterization of the aqueous degree of swelling

Simmons, M. R.; Yamasaki, E. N.; Patrickios, Costas S. (2000)

A series of hydrophilic model networks based on homopolymers of a weak base were prepared using group transfer polymerization (GTP) and characterized in terms of their aqueous degree of swelling as a function of pH. This ...

Article

Chaotropic salts interacting with soft matter: Beyond the lyotropic series

Leontidis, Epameinondas (2016)

The effects of the chaotropic ions of the Hofmeister series on many systems and phenomena are typically quite pronounced. What happens, however, when one uses chaotropic ions beyond SCN−, ClO4 −, or guanidinium, which are ...

Article

Charge generation in inorganic/organic photovoltaic blends

Westenhoff, S.; Hayes, Sophia C.; Greenham, N. C.; Silva, C. (2004)

We apply ultrafast spectroscopy to investigate charge generation kinetics in blends of semiconducting polymers and cadmium selenide nanocrystals with photovoltaic applications. The rate is limited by diffusion of the primary ...

Article

Chiral separation of the clinically important compounds fucose and pipecolic acid using ce: Determination of the most effective chiral selector

Hadjistasi, Christoforos A.; Stavrou, Ioannis J.; Stefan-Van Staden, R. -I; Aboul‐Enein, Hassan Y.; Kapnissi‐Christodoulou, Constantina P. (2013)

In this study, simple electrophoretic methods were developed for the chiral separation of the clinically important compounds fucose and pipecolic acid. In recent years, these analytes, and particularly their individual ...

Article

Chiral Separations Using Polymeric Surfactants and Polyelectrolyte Multilayers in Open-Tubular Capillary Electrochromatography

Kapnissi‐Christodoulou, Constantina P.; Valle, B. C.; Warner, I. M. (2003)

In this study, fused-silica capillaries are modified using a polyelectrolyte multilayer (PEM) coating procedure in open-tubular capillary electrochromatography. The PEM coating was constructed in situ with alternating ...

Article

Composite nanotubes formed by self-assembly of PbS nanoparticles

Leontidis, Epameinondas; Orphanou, M.; Kyprianidou-Leodidou, Tasoula; Krumeich, F.; Caseri, Walter (2003)

Unusual arrangements of nanoparticles were observed during the synthesis and subsequent dissolution of PbS particles under the action of the surfactant sodium dodecyl sulfate (SDS) in solutions containing hydrophilic ...

Article

Covalent amphiphilic polymer networks

Patrickios, Costas S.; Georgiou, Theoni K. (2003)

The recent literature on chemically cross-linked amphiphilic polymer networks is reviewed. The main subjects covered are network synthesis, characterization, modeling and applications. Special mention is made to more modern ...

Article

Direct observation of ultrafast long-range charge separation at polymer-fullerene heterojunctions

Provencher, F.; Bérubé, N.; Parker, A. W.; Greetham, G. M.; Towrie, M.; Hellmann, C.; Côté, M.; Stingelin, N.; Silva, C.; Hayes, Sophia C. (2014)

In polymeric semiconductors, charge carriers are polarons, which means that the excess charge deforms the molecular structure of the polymer chain that hosts it. This results in distinctive signatures in the vibrational ...

Article

Enantioanalysis of pipecolic acid with stochastic and potentiometric microsensors

Stefan-Van Staden, R. -I; Moldoveanu, I.; Sava, D. -F; Kapnissi‐Christodoulou, Constantina P.; Van Staden, J. F. (2013)

Stochastic and potentiometric microsensors based on porphyrins and polymeric surfactants such as polysodium N-undecanoyl- l-leucylvanilate and polysodium N-undecanoyl- l-vanilate were developed for enantioselective assay ...

Article

Enantioseparations in open-tubular capillary electrochromatography: Recent advances and applications

Kapnissi‐Christodoulou, Constantina P.; Nicolaou, Athina G.; Stavrou, Ioannis J. (2016)

This review highlights recent advances and applications in open-tubular capillary electrochromatography (OT-CEC) for enantioseparations during the last decade. Although extensive research has been conducted in the area of ...

Article

Formation mechanism of nanotubes comprising layers of PbS nanoparticles in polymer-surfactant solutions

Orphanou, M.; Leontidis, Epameinondas; Kyprianidou-Leodidou, Tasoula; Caseri, Walter; Krumeich, F.; Kyriacou, Kyriacos C. (2006)

The crystallization of PbS in aqueous solutions containing the surfactant sodium dodecyl sulfate (SDS) and hydrophilic polymers resulted in a novel type of metastable nanotubes, the walls of which consist of layers of ...

Article

Hydrophilic cationic star homopolymers based on a novel diethanol-n-methylamine dimethacrylate cross-linker for sirna transfection: Synthesis, characterization, and evaluation

Pafiti, Kyriaki S.; Mastroyiannopoulos, Nikolaos P.; Phylactou, Leonidas A.; Patrickios, Costas S. (2011)

Four cationic hydrophilic star homopolymers based on the novel hydrophilic, positively ionizable cross-linker bis(methacryloyloxyethyl)methylamine (BMEMA) were synthesized using sequential group transfer polymerization ...