Results 41 to 50 of about 2,265 (207)

SPEEK: effect evaluation of a Ghanaian school-based and peer-led sexual education programme [PDF]

Health Education Research, 2018
In sub-Saharan Africa, theory and evidenced-based interventions that are systematically designed and using sound evaluation methods to report on effectiveness are limited. A sex education programme called SPEEK was developed, implemented and evaluated in Ghana using the Intervention Mapping approach.
John K Krugu, Fraukje E F Mevissen, Gerard Van Breukelen, Robert A C Ruiter   +3 more
openaire   +2 more sources

Multilayered PEC nanofiltration membranes based on SPEEK/PDDA for anion separation

, 2010
Layer-by-layer (LBL) deposition of polyelectrolytes (PEs) on porous substrates has emerged as a versatile and inexpensive method to form high flux nanofiltration (NF) membranes.
Ivo F.J. Vankelecom, Vankelecom, Ivo, Li, Xianfeng, Meesschaert, Boudewijn, Ahmadiannamini, Pejman, Goyens, Ward, Vankelecom, Ivo F. J.   +6 more
core   +1 more source

Novel proton conducting core–shell PAMPS-PVBS@Fe2TiO5 nanoparticles as a reinforcement for SPEEK based membranes

Scientific Reports, 2021
In this study, new nanocomposite membranes from sulfonated poly (ether ether ketone) (SPEEK) and proton-conducting Fe2TiO5 nanoparticles are prepared by the solution casting method.
Parisa Salarizadeh, Mehran Javanbakht, Mohammad Bagher Askari, Khadijeh Hooshyari, Morteza Moradi, Hossein Beydaghi, Mohadese Rastgoo-Deylami, Morteza Enhessari   +7 more
doaj   +1 more source

Composite sPEEK with Nanoparticles for Fuel Cell's Applications: Review [PDF]

, 2012
The membranes in fuel cells must both conduct protons and serve as a barrier for fuel. This review discusses modifications nanoparticles of sPEEK (sulfonated polyether-ether ketone), sPEEK have advantages properties as fuel cell’s membranes such as ...
Arief , Rahman Hakim, Tutuk , Djoko Kusworo, Aprilina , Purbasari, Eniya, Listiani Dewi   +3 more
core  

Investigation of thermo-mechanical behavior, proton transfer and methanol permeation of polymer electrolyte membrane in low sulfonated state modified with thermally stable surface functionalized graphene oxide nanosheets

Polymer Testing, 2021
Sulfonated polyether ether ketone is currently under investigation to replace the expensive Nafion® as polymer electrolyte membrane. Sulfonic acid group is hydrophilic in nature and plays a key role in proton transfer in polymer electrolyte membranes ...
Sher Ayaz, Hai-Yin Yu
doaj   +1 more source

Obtenção e caracterização de compósitos de poli (éter-éter-cetona) sulfonado/níquel-fósforo com condução protônica e elétrica [PDF]

, 2012
Dissertação (mestrado) - Universidade Fderal de Santa Catarina, Centro Tecnologico, Programa de Pós-Graduação em Ciências e Engenharia de Materiais, Florianópolis, 2010O estudo e desenvolvimento de compósitos metal-polímero representa uma alternativa ...
Käfer, Karine Andrea
core  

Finding the Perfect Match: Investigation of 1,2‐Diketone‐Based Materials for Use as Cathode Active Material in Rechargeable Magnesium Batteries

Small, EarlyView.
A novel and generally applicable early screening method for 1,2‐diketones via cyclic voltammetry and DFT computations identifies phenanthrenequinone as a suitable candidate as cathode active material for use in RMB. Its successful incorporation into a polymer enabled promising lithium and magnesium battery performance.
Noushine Dorrani, Hendrik Koger, Ingo Krossing, Daniel B. Werz   +3 more
wiley   +1 more source

Pengaruh Metode Sulfonasi dan Penambahan Pengisi pada Membran Direct Metanol Fuel Cell

JRST: Jurnal Riset Sains dan Teknologi, 2018
Penggunaan polieter-eter keton (PEEK) sebagai membran pengganti nafion pada aplikasi direct methanol fuel cell (DMFC)  menjadi penelitian yang terus dikembangkan, Penyempurnaan  PEEK menuju karakteristik nafion juga terus dilakukan dengan berbagai metode,
Muhammad Fahmi Hakim, Tutuk Djoko Kusworo   +1 more
doaj   +1 more source

Studies on the SPEEK membrane with low degree of sulfonation as a stable proton exchange membrane for fuel cell applications [PDF]

Hydrogen, Fuel Cell & Energy Storage, 2017
Sulfonated poly (ether ether ketone) (SPEEK) with a low degree of sulfonation (DS = 40%) was prepared for proton exchange membrane fuel cells (PEMFC).
Mohammad Javad Parnian, Fatemeh Gashoul, Soosan Rowshanzamir   +2 more
doaj   +1 more source

Simple, inexpensive and RNase-free purification of plasmid DNA by fractional precipitation with isopropanol

BioTechniques, 2021
We present a modified alkaline lysis method for purification of plasmid DNA (pDNA) from bacterial extract using fractional precipitation with isopropanol (FPI).
Viiu Paalme, Mart Speek
doaj   +1 more source