Article
Polymer Science
Eniko Hornyak-Mester, Dora Mentes, Laszlo Farkas, Alpar Ferencz Hatvani-Nagy, Miklos Varga, Bela Viskolcza, Gabor Muranszky, Bela Fiser
Summary: Growing concerns about plastic product emissions have prompted significant changes worldwide. Car manufacturers have introduced emission standards and studied the volatile emissions from automotive flexible polyurethane foams using new analysis methods. The catalysts and surfactants used in the formulation were found to be the main sources of volatile organic compounds.
POLYMER DEGRADATION AND STABILITY
(2023)
Article
Environmental Sciences
Aleksander Hejna, Paulina Kosmela, Adam Olszewski, Lukasz Zedler, Krzysztof Formela, Katarzyna Skorczewska, Adam Piasecki, Mariusz Marc, Roman Barczewski, Mateusz Barczewski
Summary: Rapid economic growth has led to increased waste generation in multiple industries, including the automotive sector, due to the lack of established recycling and utilization methods. One particular concern is the large amount of post-consumer tires, which are considered burdensome waste due to the emission of volatile organic compounds (VOCs). To address this issue, novel and environmentally friendly methods for utilizing these tires are needed. One promising approach is shredding the tires to generate ground tire rubber (GTR), which can be used as filler in polymeric materials. This study focuses on the thermomechanical treatment of GTR with zinc borate in a twin-screw extruder to improve its performance in flexible polyurethane (PU) foams. The impact of modification parameters on various properties, including cellular structure, mechanical performance, thermal stability, thermal insulation, and acoustic properties, was investigated. VOC emissions from the fillers and composites were also monitored and evaluated. The results showed that the proposed method of GTR thermomechanical treatment with zinc borate particles can enhance the performance of flexible PU foamed composites and reduce VOC emissions, thus expanding the application range of GTR and providing new ways for its efficient utilization.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Biotechnology & Applied Microbiology
Florian Ponzio, Julien Kelber, Laura Birba, Kamal Rekab, Vincent Ritleng, Loic Jierry, David Edouard
Summary: Polyurethane foams have a potential application in photocatalysis but require a polydopamine film coating to enhance their photostability. Functionalized foams loaded with TiO2 particles can efficiently degrade formic acid in water and the mineralization of acetaldehyde, n-heptane, toluene, and acetone in air.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Article
Polymer Science
Jingmiao Zhang, Naruhito Hori, Akio Takemura
Summary: Using agricultural waste particles as fillers in polyurethane foam can improve physical and mechanical properties, enhance thermal stability, and create more uniform cellular structure. Among the four types of waste particles studied, rice straw particles showed the greatest promoting ability for foam modification, while oilseed rape straw particles had a more complex influence. Adding appropriate amounts of agricultural waste particles can be cost-effective, environmentally friendly, and widely applicable for biomass utilization and biopolymer preparation.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
Blaz Zdovc, Maja Grdadolnik, David Pahovnik, Ema Zagar
Summary: Chemical recycling of polyurethane foams (PUFs) generates partially aromatic amino-functionalized polyol chains. A liquid adsorption chromatography (LAC) method coupled with size-exclusion chromatography (SEC) was developed to separate and quantify polyol chains based on their end-group functionality and chain size. The accuracy of the method was confirmed by comparing the results with nuclear magnetic resonance, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry, and SEC coupled with a multi-detection system. Evaporative light scattering detector and appropriate calibration curve were used to quantify fully hydroxyl-functionalized chains in recycled polyols.
Article
Nanoscience & Nanotechnology
David M. Wirth, Justin D. Hochberg, Jonathan K. Pokorski
Summary: Recent developments in highly expandable foaming pre-polymer resins for lithographic additive manufacturing have enabled the creation of larger structures than a printer's build envelope. This manuscript presents a method for strengthening lightweight polymeric structures by aerosol spray application of a high-strength, low-viscosity photocurable coating, which can be easily implemented using an ordinary cordless paint sprayer and cured rapidly with sunlight.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Characterization & Testing
Marton Tomin, Daniel Torok, Tamas Paszthy, Akos Kmetty
Summary: We developed an image processing algorithm and applied it on high-speed camera recordings to characterize the deformation response of three-layered density-graded foam structures under drop weight testing. The effect of layer order on shock absorption capability was evaluated, and foam structures with a higher density top layer and a negative density gradient showed enhanced energy absorption. The method presented can be used for designing sports and packaging foam products.
Article
Engineering, Manufacturing
Won-Bin Lim, Ji-Hong Bae, Min-Ji Seo, Jin-Gyu Min, Ju-Hong Lee, Young-Suk Jung, PilHo Huh
Summary: An acryl-functionalized urethane prepolymer series was synthesized and a novel acryl-urethane resin was designed for DLP 3D printing. The combination of photo-initiators and additives resulted in excellent printing performance and surface properties. This UV-curable AU resin holds promise for biocompatible and photo-curable applications.
ADDITIVE MANUFACTURING
(2022)
Article
Materials Science, Multidisciplinary
Caterina Casavola, Lucia Del Core, Vincenzo Moramarco, Giovanni Pappalettera, Marika Patronelli
Summary: This study investigated the response of soft open-cell polyurethane foams with various densities through quasi-static tests, utilizing digital image correlation technique to analyze displacement fields without the need for surface painting. The obtained displacement maps, strain fields, and stress-strain curves provided valuable insights for analyzing and evaluating the mechanical properties of the materials.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Polymer Science
Vincent Valette, Nasreddine Kebir, Fabrice Burel, Laurence Lecamp
Summary: A novel method for designing non-isocyanate polyurethane (NIPU) foams has been developed, using a transurethane polycondensation reaction between fatty biscarbamates, fatty diols, and diamines. A biobased aminotelechelic NIPU oligomer was synthesized and mixed with an amino-telechelic polydimethylsiloxane (PDMS) and a biosourced tri-epoxide molecule as the crosslinking agent. The foams exhibited varying cell diameters, densities, thermal stability thresholds, glass transition temperature values, and Young modulus values, depending on the content of PDMS and/or the morphological parameters.
EXPRESS POLYMER LETTERS
(2023)
Article
Plant Sciences
Junli Ye, Jingyan Song, Yuan Gao, Xu Lu, Wenyue Pei, Feng Li, Hui Feng, Wanneng Yang
Summary: This study developed a low-cost phenotyping platform based on machine vision for the automatic evaluation of fluorescence-related traits in tobacco leaves, which can dynamically monitor the changes of TMV-GFP in tobacco leaves.
FRONTIERS IN PLANT SCIENCE
(2022)
Article
Engineering, Multidisciplinary
Filippo Attivissimo, Vito Ivano D'Alessandro, Attilio Di Nisio, Giuliano Scarcelli, Justin Schumacher, Anna Maria Lucia Lanzolla
Summary: This paper examines eye blinking as a means to determine the state of the eyes, analyzing and comparing the performance of five video-based blink algorithms. The results show that the proposed techniques are successful in detecting eye blinks.
Article
Nanoscience & Nanotechnology
Chaoqian Luo, Christopher Chung, Nicholas A. Traugutt, Christopher M. Yakacki, Kevin N. Long, Kai Yu
Summary: This study investigates novel approaches to control the foam structure and the matrix phase mechanical behavior to enhance the energy absorption capability of flexible lattice foams. The introduction of an additional energy dissipation mechanism in the solid matrix phase material through 3D printing lattice foams with polydomain liquid crystal elastomer (LCE) shows dramatically enhanced energy dissipation compared to conventional elastomer lattice foams. Increasing lattice connectivity leads to higher energy dissipation in the lattice foam, with stretching allowing greater mesogen rotation than bending.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Water Resources
Simone Noto, Flavia Tauro, Andrea Petroselli, Ciro Apollonio, Gianluca Botter, Salvatore Grimaldi
Summary: Monitoring ephemeral and intermittent streams is challenging in hydrology. This study proposes a stage-camera system that combines digital cameras and computer vision techniques to monitor water levels in ungauged headwater streams. Benchmark experiments demonstrate the feasibility of the system, with maximum mean absolute errors within 2 cm.
HYDROLOGICAL SCIENCES JOURNAL
(2022)
Article
Polymer Science
Ji-Hong Bae, Jong Chan Won, Won Bin Lim, Ju Hong Lee, Jin Gyu Min, Si Woo Kim, Ji-Hyo Kim, PilHo Huh
Summary: An acryl-functionalized polyurethane series was successfully synthesized to control the flexibility of photo-cured 3D printing architectures. By precisely controlling the UV absorbance and exposure energy of the resin, the optimal hard and precisely curved 3D structures were achieved. The formulations showed improved flexural resolution and suitability for flexible applications in consumer/industrial and biomedical fields.
Article
Chemistry, Analytical
A. O. Melekhin, V. V. Tolmacheva, E. G. Shubina, S. G. Dmitrienko, V. V. Apyari, A. I. Grudev
Summary: Hypercrosslinked polystyrene was used for the multicomponent solid-phase extraction to determine residues of 63 veterinary preparations in chicken meat. The method showed quantitative extraction of analytes with good reproducibility, high sensitivity, and accuracy for various veterinary drugs.
JOURNAL OF ANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Analytical
V. V. Apyari, Kh P. Tiras, S. E. Nefedova, M. Gorbunova
Summary: A mini-spectrophotometer monitor calibrator was used to non-invasively measure the hemolymph spectra of invertebrate animals in vivo. Characteristics of the spectra were analyzed to propose criteria for estimating satiety degree and discriminating planaria based on different feeding states. This method showed a reliability of at least 80% in discriminating planaria by their state, indicating its potential for ecological and toxicological monitoring.
MICROCHEMICAL JOURNAL
(2021)
Article
Chemistry, Analytical
Artem O. Melekhin, Veronika V. Tolmacheva, Elena G. Shubina, Stanislava G. Dmitrienko, Vladimir V. Apyari, Artyom Grudev
Summary: In this study, 5-nitro-2-furaldehyde (5-NFA) was utilized as a new derivatizing agent for nitrofuran metabolites analysis, with magnetic solid phase extraction (MSPE) enhancing the efficiency of sample clean-up. The method showed high recoveries, good precision, and low limits of detection and quantitation, making it suitable for the analysis of nitrofuran metabolites in honey samples.
Article
Chemistry, Analytical
Aleksei Furletov, Vladimir Apyari, Alexey Garshev, Stanislava Dmitrienko, Yury Zolotov
Summary: In this study, the potential of silver triangular nanoplates (AgTNPs) as a colorimetric probe for the fast and sensitive determination of bioflavonoids was assessed. The interaction between AgTNPs and bioflavonoids in the presence of silver(I) ions resulted in a bathochromic shift and increased intensity of the nanoparticles' local surface plasmon resonance band. The detection limits of different bioflavonoids were determined and the influence of analyte structure and external factors on the analytical signal was discussed.
Article
Chemistry, Analytical
Vladimir V. Apyari, Aleksei A. Furletov, Vyacheslav Kalinin, Stanislava G. Dmitrienko, Yury A. Zolotov
Summary: Microfluidic paper-based analytical devices (μPADs) are a promising green analytical strategy for low-cost and simple determination of various analytes. In this study, a novel three-reagent μPAD was developed for the quantitation of the antioxidant dihydroquercetin, and it was shown to be effective in distinguishing it from its structural analogue, quercetin.
Article
Chemistry, Physical
V. V. Tolmacheva, V. Yu. Savinova, N. O. Goncharov, S. G. Dmitrienko, V. V. Apyari, P. A. Chernavsky, G. V. Pankina
Summary: A study investigates the sorption of chloramphenicol, florfenicol, and thiamphenicol on magnetic hypercrosslinked polystyrene (HCPS/Fe3O4). It is found that introducing Fe3O4 nanoparticles into HCPS slightly decreases the specific surface area and pore volume of the sorbent, but it is still sufficient for use. The study also shows that the HCPS-based magnetic sorbent exhibits superparamagnetic behavior and can be used for magnetic solid-phase extraction of amphenicols.
RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A
(2022)
Article
Chemistry, Applied
A. O. Melekhin, V. V. Tolmacheva, N. O. Goncharov, V. V. Apyari, S. G. Dmitrienko, E. G. Shubina, A. Grudev
Summary: A quantitative multi-class multi-residue analytical method using high-performance liquid chromatography - tandem mass spectrometry (HPLC-MS/MS) was developed for the determination of veterinary drugs in milk. The method demonstrated high recoveries and low relative standard deviations, making it suitable for the detection of veterinary drug residues in real milk samples.
Article
Chemistry, Analytical
A. A. Furletov, V. V. Apyari, A. Garshev, S. G. Dmitrienko
Summary: The possibilities of using analytical systems based on silver triangular nanoplates for the spectrophotometric determination of reductants are investigated. The interaction mechanism between silver triangular nanoplates and L-ascorbic acid is proposed and utilized for the determination of reductants. The effects of pH, interaction time, and concentrations of reagents and foreign compounds on the analytical signal are studied. The proposed method is successfully applied to the determination of L-ascorbic acid in leafy green tea and apple juice.
JOURNAL OF ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Analytical
A. O. Melekhin, V. V. Tolmacheva, Yu N. Kholyavskaya, E. S. Sedykh, S. G. Dmitrienko, V. V. Apyari, A. L. Bairov
Summary: We proposed a procedure for the rapid sample preparation of food samples for the determination of nitrofuran metabolites in them by HPLC-MS/MS, using 5-nitro-2-furaldehyde as a new derivatizing agent. The time of hydrolysis-derivatization in a thermostated ultrasonic bath could be significantly shortened by raising temperature to 80 degrees C and increasing the concentration of hydrochloric acid to 0.5 M. The proposed method ensures the quantitative isolation of metabolites in chicken meat samples.
JOURNAL OF ANALYTICAL CHEMISTRY
(2022)
Review
Biochemical Research Methods
Artem O. Melekhin, Veronika V. Tolmacheva, Vladimir V. Apyari, Stanislava G. Dmitrienko
Summary: Nitrofurans (NFs) are synthetic broad-spectrum antibacterial and antiparasitic drugs extensively used in veterinary practice. NFs can generate potentially carcinogenic and mutagenic metabolites, which have adverse effects on human health. Despite being banned in many countries, NFs are still used in some regions. Therefore, the development of reliable and sensitive analytical methods for monitoring NF metabolites in animal-derived foods is crucial.
JOURNAL OF CHROMATOGRAPHY A
(2022)
Article
Chemistry, Analytical
Svetlana V. Smirnova, Vladimir V. Apyari
Summary: This study uses aqueous two-phase systems (ATPSs) containing a mixture of cationic and anionic surfactants for the preconcentration of synthetic food dyes. A rapid, simple, low-cost, and environmentally friendly method based on microextraction in ATPSs and spectrophotometric/colorimetric determination is proposed. The method was applied to the determination of dyes in food samples and food-processing industrial wastewater.
Article
Chemistry, Analytical
Maria V. Gorbunova, Anastasia S. Safronova, Alexandra A. Vasilyeva, Ksenia S. Spitsyna, Vladimir V. Apyari, Stanislava G. Dmitrienko
Summary: The possibility of using a common monitor calibrator for the fluorometric determination of sulfonamide drugs was investigated. It was found that the luminescence measurements with a calibrator can be optimized by using Eppendorf-type black plastic microtubes. The detection limit of sulfanilamide and sulfamethazine using a monitor calibrator was comparable to spectrophotometric determination.
Article
Chemistry, Analytical
Aleksei Furletov, Vladimir Apyari, Pavel Volkov, Irina Torocheshnikova, Stanislava Dmitrienko
Summary: In this study, a composite material based on silver triangular nanoplates and polyurethane foam was proposed for chemical analysis. It was found that the aggregation of silver nanoparticles upon the action of thiols resulted in spectral changes that could be observed using household color-recording devices or visually. Different thiols with varying functional groups were tested, and their detection limits were determined.
Review
Chemistry, Analytical
Aleksei A. Furletov, Vladimir V. Apyari, Valeriy D. Zaytsev, Anna O. Sarkisyan, Stanislava G. Dmitrienko
Summary: Recently, non-spherical nanoobjects known as silver triangular nanoplates (AgTNPs) have gained significant attention as promising reagents in optical molecular spectroscopy. This review covers various methods for synthesis of AgTNPs, including classical approaches (citrate and borohydride), novel microwave/ultrasound-assisted methods, synthesis in organic solvents, photochemical, biological, and biochemical methods. The advantages and shortcomings of each approach are discussed, along with the applications of AgTNPs in UV-Vis spectrometry, diffuse reflectance spectroscopy, and test analysis. Additionally, the methods for detecting metal ions, anions, and organic compounds using AgTNPs are examined, as well as the current trends in these areas.
TRAC-TRENDS IN ANALYTICAL CHEMISTRY
(2023)
Article
Optics
Sergey Kovalev, Tatyana Tikhomirova, Vladimir Apyari
Summary: The concept of immobilized sorption-colorimetric microprobes for preconcentration and sensing of colored analytical forms is proposed. The probes consist of individual particles of sorbents attached to an adhesive strip, producing colorimetric responses through preconcentration of colored analytical forms. The obtained responses are then directly recorded, separated from a background, and processed to determine the amounts of analytes. The method showed applicability for the determination of 1-7 mg L-1 of the tested food dyes.
