Article
Chemistry, Analytical
Wiktoria Lipinska, Katarzyna Siuzdak, Jakub Karczewski, Anna Dolega, Katarzyna Grochowska
Summary: A novel electrode material composed of structured titanium foil with embedded Au nanoparticles and modified with chitosan for glucose detection was presented. The material demonstrated excellent performance with a wide linear range, high sensitivity, and low limit of detection, showing perfect selectivity and stability for biosensing applications.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Engineering, Chemical
Jian-Hong Fan, Jian Ou, Kewen Tang
Summary: By modifying the immobilized lipase with metal-organic frameworks, the kinetic resolution of mandelic acid enantiomers can be achieved. The optimized conditions and excellent outcomes demonstrate the potential application value of this enzymatic process in kinetic resolution reactions.
CHEMICAL ENGINEERING & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Mohan Kumar Kuntumalla, Mohammed Attrash, Miriam Fischer, Shaul Michaelson, Tatyana Kravchuk, Alon Hoffman
Summary: The study explores how the chemical and structural properties of initial nitrogen terminated diamond surfaces affect the distribution of nitrogen and hydrogen. It was found that nitrogen retention efficiency in the delta layer depends on the crystallinity and bonding of the nitrogen terminated surface, while hydrogen diffusion into the N delta layer occurs following the nitrogen distribution, mainly bonding to nitrogen and defects. The optimal conditions yield a FWHM of -3 nm in diamond (100) with a maximum nitrogen and hydrogen concentration of -1.2?1020 atoms.cm-3 and -2.0?1021 atoms. cm-3, respectively, with high crystallinity in the overgrown layers.
APPLIED SURFACE SCIENCE
(2021)
Article
Engineering, Chemical
Katerine da S. Moreira, Andre Luiz Barros de Oliveira, Lourembergue Saraiva de Moura Junior, Isamayra Germano de Sousa, Antonio Luthierre Gama Cavalcante, Francisco Simao Neto, Roberta Bussons Rodrigues Valerio, Anderson Valerio Chaves, Thiago de Sousa Fonseca, Daniel Morais Vieira Cruz, Gledson Vieira Lima, Gabriel Paixao de Oliveira, Maria Cristiane Martins de Souza, Pierre Basilio Almeida Fechine, Marcos Carlos de Mattos, Aluisio Marques da Fonseca, Jose C. S. dos Santos
Summary: In this study, co-immobilization of lipase A and lipase B from Candida antarctica in glutaraldehyde-activated chitosan was optimized using the Taguchi method, achieving a high immobilization yield and activity. The CALA-CALB-CHI derivative showed a longer half-life and higher catalytic activity compared to the soluble enzyme mixture under different pH conditions. Additionally, the immobilized derivative demonstrated excellent performance in the kinetic resolution of halohydrins acetates, producing enantiomerically enriched products that are important intermediates in drug synthesis.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Chemistry, Organic
Isabel N. Hegarty, Adam F. Henwood, Samuel J. Bradberry, Thorfinnur Gunnlaugsson
Summary: This paper describes the synthesis of two new polymers, P1 and P2, made from P(E-alt-MA) with 2,6-bis(1,2,3-triazol-4-yl)pyridine (btp) ligand side chains. These polymers were shown to be soluble in MeOH solution and P1 was also soluble in water, while P2 required prolonged heating for water dissolution. Both P1 and P2 were demonstrated to bind to Tb(iii) ions and exhibit luminescence through UV-Vis absorption, fluorescence emission, and time-gated phosphorescence spectroscopies. The analysis of titration data revealed a 1:2 (M:L; Tb(iii) : btp) stoichiometry, indicating crosslinking of two btp ligands and coordination by the polymer backbone.
ORGANIC & BIOMOLECULAR CHEMISTRY
(2023)
Proceedings Paper
Computer Science, Artificial Intelligence
Simiao Wang, Yunan Liu, Chunpeng Wang, Mingyu Lu
Summary: In this paper, a new multi-task framework for very small face image super-resolution and recognition is proposed. By introducing Dense Up-down Sampling Unit (DUSU), high frequency sub-bands of Non-Subsampled Contourlet Transform (NSCT), and an evaluation network with perceptual loss, a method that can effectively recover face image details and identity information is presented.
FOURTEENTH INTERNATIONAL CONFERENCE ON GRAPHICS AND IMAGE PROCESSING, ICGIP 2022
(2022)
Article
Materials Science, Multidisciplinary
Hilal Pecenek, Fatma Kilic Dokan, M. Serdar Onses, Erkan Yilmaz, Ertugrul Sahmetlioglu
Summary: This research reports a facile and rational synthesis procedure to fabricate a high-performance supercapacitor electrode. The NiO/MnO2/CNT composite exhibits a wonderfully stratified flower-like morphology and shows high specific capacitance and good cyclic stability.
MATERIALS RESEARCH BULLETIN
(2022)
Article
Chemistry, Multidisciplinary
Furkan Sahin, Sami Pekdemir, Menekse Sakir, Zehra Gozutok, Mustafa Serdar Onses
Summary: This study addresses the limited versatility of SERS-based encoding systems by using a temporary tattoo approach and simplified fabrication of SERS-active patterns through ink-jet printing, improving the versatility of encoded surfaces.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Forestry
Ekim Elcin Soyturk, S. Nami Kartal, M. Serdar Onses, Nusret Celik
Summary: PDMS and HSNP were used to coat wood surfaces to reduce boron release from DOT-treated wood. The modified wood specimens showed improved resistance against mold fungi and had higher water contact angles. However, complete protection was not achieved with DOT + HSNP and DOT-only treated specimens. Further research is needed to understand the interaction mechanisms between PDMS/HSNP and wood surfaces.
EUROPEAN JOURNAL OF WOOD AND WOOD PRODUCTS
(2023)
Article
Chemistry, Physical
Ilker Torun, Nusret Celik, N. Burak Kiremitler, Xian Huang, M. Serdar Onses
Summary: This manuscript presents a fluorine-free approach to achieve transparent and superhydrophobic coatings on a transparent electrode. The method involves the formation of a poly(ethylene glycol) grafted film on an indium oxide coated glass substrate, followed by spray-coating alkylsilane functionalized nanoparticles. The resulting substrate exhibits high water repellency, excellent optoelectronic performance, and stability.
SURFACES AND INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Furkan Sahin, Ali Camdal, Gamze Demirel Sahin, Ahmet Ceylan, Mahmut Ruzi, Mustafa Serdar Onses
Summary: Bacteria are responsible for common infections and have caused numerous outbreaks throughout history with millions of deaths. The contamination of non-living surfaces in clinics, food chains, and the environment poses a significant threat, further exacerbated by antimicrobial resistance. Two key strategies to tackle this issue are antibacterial coatings and efficient detection of bacterial contamination. This study demonstrates the creation of antimicrobial and plasmonic surfaces using Ag-CuxO nanostructures on low-cost paper substrates through green synthesis methods. The nanostructured surfaces exhibit exceptional bactericidal efficiency and high surface-enhanced Raman scattering (SERS) activity. The CuxO component provides rapid and outstanding antibacterial activity, eradicating >99.99% of Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus bacteria within 30 minutes. Plasmonic Ag nanoparticles enhance electromagnetic Raman scattering, enabling rapid, label-free and sensitive bacterial identification at concentrations as low as 103 cfu/mL. The ability to detect different strains at such low concentrations is attributed to the leaching of intracellular bacterial components caused by the nanostructures. Additionally, SERS coupled with machine learning algorithms achieves automated bacterial identification with an accuracy exceeding 96%. This proposed strategy, utilizing sustainable and low-cost materials, achieves effective prevention of bacterial contamination and accurate identification on the same material platform.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Nusret Celik, Furkan Sahin, Sultan Suleyman Ozel, Gulay Sezer, Nail Gunaltay, Mahmut Ruzi, M. Serdar Onses
Summary: A fluorine-free and biocompatible superhydrophobic coating, composed of silica nanoparticles and carnauba wax, has been developed for thermal healing after abrasion. The rapid self-healing ability of the coating is attributed to the low melting point of carnauba wax and its migration to the surface of hydrophilic silica nanoparticles. The coating not only exhibits fast self-healing, increased water repellency, and thermal stability after healing, but also shows high levels of biocompatibility.
Article
Chemistry, Multidisciplinary
Nusret Celik, Serdar Akay, Furkan Sahin, Gulay Sezer, Esen Dagasan Bulucu, Mahmut Ruzi, Hans-Juergen Butt, Mustafa Serdar Onses
Summary: A mechanochemical approach for practical and solvent-free manufacturing of superhydrophobic surfaces is reported, which overcomes the limitations of existing methods in terms of solvent usage, chemical processes, biocompatibility, and material cost. The approach enables the ultra-rapid preparation of superhydrophobic surfaces in a single-step without the need for washing, separation, and drying. The covalent grafting of silicone to nanoparticles through hydrolytic rupture and free radical generation plays a key role in achieving superhydrophobicity.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
M. Sakir, N. Torun, N. Kayaci, I. Torun, M. Kalay, M. S. Onses
Summary: This manuscript presents a method for the fabrication of silver nanoflowers with high surface-enhanced Raman scattering (SERS) activity and unique morphology. The nanoflowers are formed through seed-mediated growth of silver nanostructures over gold nanoparticles on hemispherical polymer features. The silver nanoflowers exhibit high SERS activity, allowing for detection of rhodamine 6G at a concentration of 100 pM. This fabrication method has great potential for anti-counterfeiting applications.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Nanoscience & Nanotechnology
Abidin Esidir, Nilgun Kayaci, N. Burak Kiremitler, Mustafa Kalay, Furkan Sahin, Gulay Sezer, Murat Kaya, M. Serdar Onses
Summary: Counterfeit products in the pharmaceutical and food industries pose increasing threats to health. A study has developed security labels using food-grade materials, such as corn starch, to prevent counterfeiting. These labels, composed of fluorescent microparticles, offer a low-cost and sustainable solution in the fight against counterfeiting, with promising performance in terms of uniqueness and randomness.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Sangsun Lee, Sami Pekdemir, Nilgun Kayaci, Mustafa Kalay, Mustafa Serdar Onses, Jongpil Ye
Summary: There is growing interest in using systems with randomized responses to generate physically unclonable functions (PUFs) for anti-counterfeiting and authentication applications. Graphene, with atomic-level control over its thickness and unique Raman spectrum, is an attractive material for PUF applications. In this study, graphene PUFs were created through two independent stochastic processes. Random variations in the shape and number of graphene adlayers were achieved by understanding and improving the chemical vapor deposition of graphene. The randomized positioning of graphene domains was facilitated by dewetting the polymer film and oxygen plasma etching, resulting in surfaces with randomly positioned and shaped graphene islands with different numbers of layers and Raman spectra.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Forestry
F. Digdem Tuncer, S. Nami Kartal, Ekim Elcin Soyturk, Rachel A. Arango, Katie M. Ohno, M. Serdar Onses, Nusret Celik, Claudia Marcela Ibanez
Summary: This study evaluated the effect of contact charring plus linseed oil submersion on wood chemistry and microstructure in Pinus taeda and Eucalyptus bosistoana wood specimens. The study found that charring increased the total lignin content and decreased the total carbohydrate content of the wood. Charring also increased the hydrophobicity of the wood surface. The study also observed that charring affected the sensitivity and homogeneity of the cell walls.
EUROPEAN JOURNAL OF WOOD AND WOOD PRODUCTS
(2023)
Article
Chemistry, Multidisciplinary
Ilker Torun, Conan Huang, Mustafa Kalay, Moonsub Shim, M. Serdar Onses
Summary: This article introduces the pH tunable assembly of quantum dots (QDs) over functional patterns prepared by electrohydrodynamic jet printing of poly(2-vinylpyridine). The pH of the dispersion provides tunability at two levels, allowing for modulation of QDs adsorption density and fluorescence. The selective adsorption of QDs enables both deterministic patterning and hierarchically structured encoding of information. Through image analysis and feature matching algorithms, it is demonstrated that these patterns are unclonable and suitable for anti-counterfeiting applications.
Article
Nanoscience & Nanotechnology
Nusret Celik, Berk Sezen, Furkan Sahin, Ahmet Ceylan, Mahmut Ruzi, Mustafa Serdar Onses
Summary: This study presents a rapid and eco-friendly approach to preparing superhydrophobic surfaces by chemically grafting alkylsilane molecules onto silica nanoparticles using a mechanochemical process. The resulting surface exhibits high water contact angle, low sliding angle, durability, and antifouling ability against urine. The proposed approach is practical, swift, and cost-effective, making it a scalable and eco-friendly technique for the solvent-free preparation of superhydrophobic surfaces.
ACS APPLIED NANO MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Abidin Esidir, Nilgun Kayaci, N. Burak Kiremitler, Mustafa Kalay, Furkan Sahin, Gulay Sezer, Murat Kaya, M. Serdar Onses
Summary: Counterfeit products in the pharmaceutical and food industries are a growing threat to health. This study presents the development of security labels using food-grade materials, specifically food-grade corn starch and a food colorant. The labels are created through spin-coating and transfer onto an edible gelatin film, with randomly positioned particles used to construct a physically unclonable function (PUF)-based security label. The performance of the PUFs demonstrates their potential in preventing counterfeiting, and their biocompatibility is confirmed through cell assays.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Nusret Celik, Furkan Sahin, Mahmut Ruzi, Ahmet Ceylan, Hans-Jurgen Butt, Mustafa Serdar Onses
Summary: A mechanochemical activation strategy enables solventless grafting of PDMS onto various substrates, resulting in liquid-like coating surfaces. The method offers great potential for applications such as anti-biofouling coatings.
ACS APPLIED MATERIALS & INTERFACES
(2023)