Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
Permanent URI for this collectionhttps://hdl.handle.net/11147/7148
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Article Citation - WoS: 3Citation - Scopus: 3Valorization of Highly Saline Pickle Brine Waste Into Polyhydroxyalkaonate by Mixed Microbial Culture(Elsevier, 2025) Zengin, Gulsum Emel; Guven, Didem; Pala-Ozkok, Ilke; Ozturk, Dilara; Ayisigi, Ezgi; Karaca-Sadikoglu, Selin; Insel, GucluSustainable and cost-effective polyhydroxyalkaonate (PHA) production could be achieved with integration of using renewable substrates derived from waste feedstock and mixed microbial culture (MMC). This study aimed to investigate the PHA production capacity of highly saline pickle brine waste (PBW). In this context, the impact of sludge retention time (SRT) on enrichment of PHA storing MMC capable of using highly saline PBW and its effect on microbial community structure was studied. Sequencing batch reactors (SBRs) were operated at SRTs of 2, 4 and 6 days using raw PBW. Feast/famine ratios in all SBRs were between 0.03 and 0.09 indicating high PHA- storage capacity at salinity of 14.8 g NaCl/L. Highest PHA productivity was achieved at SRT of 6 days with PHA storage yield of 0.79 g COD-PHA/g COD and PHA content of 74 % (wt). Microbial population analyses revealed that PHA-producer halotolerant Neomegalonema spp. dominated the total biomass with 41 % in SBR-6 whereas halotolerant PHA-storing Paracoccus spp. and Rhodobacter spp. were dominant in SBR-4 and SBR-2. PBW is suggested to be a favorable feedstock as enrichment of halotolerant PHA storing MMC with stable and high PHA productivity was achieved which would be promising for full-scale applications.Article Citation - WoS: 114Citation - Scopus: 135Perspectives for Solid Biopolymer Electrolytes in Dye Sensitized Solar Cell and Battery Application(Elsevier Ltd., 2016) Singh, Rahul; Polu, Anji Reddy; Bhattacharya, B.; Rhee, Hee-Woo; Varlıklı, Canan; Singh, Pramod K.Photovoltaic technologies represent one of the leading research areas of solar energy which is one of the most powerful renewable alternatives of fossil fuels. In a common photovoltaic application the batteries play a key role in storage of energy generated by solar panels. Although it will take time for dye sensitized solar cells (DSSCs) and batteries based on biopolymer electrolytes to take their places in the market, laboratory studies prove that they have a lot to offer. Most efficient DSSCs and batteries available in market are based on liquid electrolytes. The advantages of liquid electrolytes are having high conductivity and good electrode-electrolyte interface whereas, disadvantages like corrosion and evaporation limit their future sustainability. Biopolymer electrolytes are proposed as novel alternatives which may overcome the problems stated above. In this review, we focus on fabrication, working principle as well as up to date status of DSSCs and batteries using biopolymer electrolytes. The effects of structural and electrical properties of biopolymer based electrolytes on the solar energy conversion efficiencies of DSSCs and their compatibility with lithium or other salts in battery applications are summarized. Biopolymer electrolyte based DSSCs are categorized on the basis of types of additives and recent outcomes of author's laboratory studies on biopolymer electrolyte based DSSCs and batteries are also presented.Article Citation - WoS: 96Citation - Scopus: 131Barrier Properties of Corn Zein Nanocomposite Coated Polypropylene Films for Food Packaging Applications(Elsevier Ltd., 2013) Özçalık, Onur; Tıhmınlıoğlu, FundaThe feasibility of corn zein nanocomposite (CZNC) coatings as an alternative to synthetic polymer barrier layer on polypropylene (PP) films was examined. The effect of layered silicate content in the CZNC layers on the barrier and surface hydrophobicity of the CZNC-PP films were investigated. Incorporation of organomodified montmorillonite (OMMT) by solution intercalation into zein matrix significantly improved oxygen and water vapor barrier of coated PP films. The barrier properties were also investigated theoretically by using various phenomenological permeability models. Tortuous permeation path formed by the fine delamination of nanoclays was found to be responsible for the barrier improvements in zein layers. In conclusion, durable CZNC-PP laminates were developed. CZNC coating of PP films has reduced the oxygen permeability nearly four times, while water vapor permeability reduced by 30% with 5 wt.% OMMT content in 5.9 μm corn zein coating.