Article
Materials Science, Multidisciplinary
Vera Serga, Aleksej Zarkov, Ervins Blumbergs, Andrei Shishkin, Janis Baronins, Edgars Elsts, Vladimir Pankratov
Summary: Hydrometallurgy is considered the most promising technology for recycling electronic waste, and a new scheme for leaching metals from pre-crushed waste using an alternating current is proposed in this paper. The experimental results show that this method can achieve efficient leaching of gold and copper.
Article
Chemistry, Multidisciplinary
Piotr Szustakiewicz, Natalia Kowalska, Maciej Baginski, Wiktor Lewandowski
Summary: A simple strategy for the fabrication of films of binary nanoparticle assemblies is introduced, with dynamic control over the configuration of gold nanorods and nanospheres achieved through the melting of liquid-crystal-like nanoparticle ligands. This approach provides a route for preparing hierarchical nanoparticle superstructures with applications in reversibly switchable, visible-range plasmonic technologies.
Article
Materials Science, Multidisciplinary
Adil Alshoaibi, Shumaila Islam
Summary: Two different methods, Turkish and sol-gel, were used to synthesize functionalized gold nanostructures. The synthesized gold nanoparticles (AuNPs) and gold nanodendritic (AuNDs) structures were characterized using various microscopy techniques. The results showed that the AuNPs and AuNDs had different morphologies and properties, with good chemical bonding and thermal stability.
Article
Chemistry, Physical
Irina G. Koryakina, Polina K. Afonicheva, Konstantin Arabuli, Anatoly A. Evstrapov, Alexander S. Timin, Mikhail Zyuzin
Summary: This review highlights recent advances in microfluidic approaches for the synthesis of optically responsive nanomaterials, emphasizing the general background of microfluidics, common considerations in the design of microfluidic chips, and theoretical models of nanoparticle formation mechanisms. Comparisons with conventional synthesis methods are provided, along with the applications of optically responsive nanoparticles in nano- and biophotonics.
ADVANCES IN COLLOID AND INTERFACE SCIENCE
(2021)
Article
Engineering, Environmental
Ziquan Wang, Zheng Li, Bo Yong, Haiyan Huang, Lei Yao, Libo Deng
Summary: An electrothermal membrane was developed by coating a commercial PET-PTFE membrane with MXene nanosheets, which can efficiently heat the surroundings and work stably under high-frequency alternating current (a.c.) input. The composite membrane enabled a higher transmembrane temperature in the Joule heating MD system than in the conventional MD, resulting in a 333% higher permeate flux.
CHEMICAL ENGINEERING JOURNAL
(2023)
Review
Biochemical Research Methods
Rafael T. P. da Silva, Heloise Ribeiro de Barros, Daiana M. Furlan Sandrini, Susana I. Cordoba de Torresi
Summary: Controlling biocatalytic processes in extracellular medium through metallic nanoparticles offers innovative solutions by manipulating enzyme activity and efficiency with external stimuli like light, electricity, magnetism, and temperature. Combining multiple stimuli can create a more refined framework for a multiresponsive system, opening up promising opportunities for future research in nanobiocatalysis.
BIOCONJUGATE CHEMISTRY
(2022)
Article
Chemistry, Physical
Miao Lei, Weiye Cai, Luetao Zou, Bin Yu, Lin Chen, Yang Cao, Shanlin Xiang, Chao Song, Jiandu Lei, Wei Jiang, Zhenming Hu
Summary: This article describes a therapeutic strategy to enhance photothermal therapy (PTT) with starvation therapy in conjunction with ferroptosis mechanism. A nanoparticle platform was constructed for precision drug delivery to osteosarcoma (OS) cells, which can induce ROS production and ferroptosis. The generated ROS and lipid peroxidation can inhibit the expression of heat shock proteins (HSPs), improving the therapeutic effect of PTT. In vitro and in vivo experiments confirmed the effectiveness of this strategy in inhibiting OS cell growth.
Correction
Chemistry, Multidisciplinary
K. Jankowski, J. Jablonska, P. Uznanski, S. Caluch, M. Szybowicz, R. Brzozowski, A. Ostafin, M. Kwasny, M. Tomasik
Summary: This study corrected the errors in a previous paper and reported the synthesis of necked gold nanoparticles using submerged alternating current arc discharge in water.
Article
Computer Science, Artificial Intelligence
Shangfei Wang, Yanan Chang, Can Wang
Summary: This article introduces a novel multi-task dual learning framework for simultaneously addressing facial landmark detection and action unit recognition tasks and exploiting their relationship. By sharing middle-level features, common patterns can be used for facial landmark detection and AU recognition, using middle- and high-level features respectively. Furthermore, a dual learning mechanism is designed to convert predicted landmarks and AUs to corresponding facial images, exploring the strong correlations between the tasks. Jointly training the proposed method at both the feature and label levels improves each task. Experiments on two benchmark databases demonstrate the proposed method's ability to leverage dependencies and boost the generalization of both tasks.
IEEE TRANSACTIONS ON AFFECTIVE COMPUTING
(2023)
Article
Engineering, Chemical
Perumal Asaithambi, Mamuye Busier Yesuf, Rajendran Govindarajan, Selvakumar Periyasamy, Subramaniapillai Niju, T. Pandiyarajan, Abudukeremu Kadier, D. Duc Nguyen, Esayas Alemayehu
Summary: In this study, various electrochemical and advanced oxidation processes (AOPs) were compared for their ability to remove color and COD from distillery industrial wastewater (DIW) and their impact on power consumption. The hybrid US + ACEF process was found to achieve complete color and COD removal with lower power consumption compared to other processes. The effects of different operational parameters on COD removal efficiency and power consumption were also investigated. The US + ACEF method is the most suitable for efficiently removing pollutants from wastewater and industrial effluent.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Marine
Enjin Zhao, Xiaoyu Xia, Jia Gao, Fengyuan Jiang, Xin Chen, Rulun Liu
Summary: This study investigates the combined effect of solitary waves and sea currents on coastal bridges under extreme marine conditions. A numerical model with the immersed boundary method is used to simulate the flow field, wave run-up, velocity, pressure, and hydrodynamic load on the piers. The results show that the total force on the pier under the joint effect of solitary wave and sea current is significantly higher than the sum of the forces under solitary wave and current. The study also reveals the influence of environmental conditions and pier characteristics on the stability of the piers.
Article
Chemistry, Multidisciplinary
Reina Kojima, Michinari Kohri, Tatsuo Taniguchi, Keiki Kishikawa, Takashi Karatsu
Summary: Electro-optically responsive liquid crystal (LC) nanocapsules were prepared by miniemulsion polymerization of oil-in-water emulsion monomer droplets dissolving LC compounds. The choice of capsule wall-forming monomers played a crucial role in the formation of capsule structure, and copolymerization of fluorine-containing monomers effectively suppressed the interaction between LC compound and capsule wall, allowing LC molecules to repeatedly change their orientation in response to an external electric field.
Article
Engineering, Marine
K. Qu, B. H. Wen, Y. Yao, W. Y. Sun, C. B. Jiang
Summary: This study investigates the hydrodynamic characteristics of movable coastal bridge deck under the joint impact of extreme surges, waves, and background current. The presence of background current significantly influences the hydrodynamic characteristics and dynamic responses of the bridge deck, increasing the potential risk of bridge damage.
Article
Chemistry, Multidisciplinary
Anna Ulyankina, Anastasia Tsarenko, Aleksey Yatsenko, Mikhail Gorshenkov, Nina Smirnova
Summary: This study provides insights into the electrosynthesis of ZnO-based materials using pulse alternating current as a green oxidant and the alkaline earth metal chloride aqueous solutions as electrolytes. The effect of electrolyte on composition and structure of final products was demonstrated. The study found that ZnO photocatalyst prepared in BaCl2 exhibited different activity tendency in different systems.
Article
Electrochemistry
Asaithambi Perumal, Mamuye Busier Yesuf, Rajendran Govindarajan, Subramaniapillai Niju, C. Arun, Selvakumar Periyasamy, T. Pandiyarajan, Esayas Alemayehu
Summary: There has been an increasing interest in the use of electrochemical and advanced oxidation technologies for industrial wastewater treatment over the past two decades. Amongst the examined techniques, the UV+AC+EF process showed the highest efficacy with 100% elimination of color and COD, and low energy consumption of 4 kWhr m(-3). Through optimization using mathematical and statistical methods, the UV+AC+EF technology achieved 89.50% COD elimination and reduced energy consumption to 2.775 kWhr m(-3).
Article
Electrochemistry
Hari Krishna Koduru, Yordan Georgiev Marinov, Shaik Kaleemulla, Peter Metodiev Rafailov, Georgi Borislavov Hadjichristov, Nicola Scaramuzza
Summary: Flexible and free-standing electrolyte membranes of nanocomposite poly(ethylene oxide) (PEO)/starch-nanocrystals (SNCs) complexed with magnesium bromide (MgBr2) salt at various concentrations were prepared using conventional solution casting technique. Various characterization techniques were used to study the microstructural and thermal stability properties of these membranes, showing an increase in diffusion coefficient and total ion concentration with higher salt concentrations.
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
(2021)
Article
Polymer Science
Georgi B. Hadjichristov, Todor E. Vlakhov, Yordan G. Marinov, Nicola Scaramuzza
Summary: Complex electrical impedance and dielectric spectroscopy were used to study the dielectric relaxations and thermal behavior in ion-conducting composites/complexes from polymer poly(ethylene oxide) (PEO) and E8 nematic liquid crystals (LCs). The results showed that temperature variations affected molecular dynamics, and salt doping improved ion conductivity.
Article
Multidisciplinary Sciences
Angelina K. Stoyanova-Ivanova, Elefteria D. Lefterova, Galia D. Ivanova, Yordan G. Marinov, Georgi B. Hadjichristov, Antonia E. Stoyanova
Summary: In this study, the electrical impedimetric response of electrochemical systems using nano-sized ZnO material doped with high-temperature superconducting ceramics was experimentally studied. The effect of ceramics additives on both complex electrical impedance and electrical conductivity was estimated.
COMPTES RENDUS DE L ACADEMIE BULGARE DES SCIENCES
(2022)
Article
Multidisciplinary Sciences
Todor E. Vlakhov, Georgi B. Hadjichristov, Yordan G. Marinov, Nicola Scaramuzza
Summary: This study investigated the effect of titanium dioxide nanoparticles on ion conductivity in polymer electrolytes. The results showed that the addition of titanium dioxide nanoparticles can modify the ion-conducting properties.
COMPTES RENDUS DE L ACADEMIE BULGARE DES SCIENCES
(2022)
Article
Multidisciplinary Sciences
Todor E. Vlakhov, Yordan G. Marinov, Georgi B. Hadjichristov, Nicola Scaramuzza
Summary: Frequency-dependent conductivity and conduction relaxation in nanocomposite solid polymer electrolyte films consisting of poly(ethylene oxide) and polyvinyl pyrrolidone blend as host matrix, NaIO4 as ions dopant, and titanium dioxide (TiO2) nanoparticles were studied.
COMPTES RENDUS DE L ACADEMIE BULGARE DES SCIENCES
(2022)
Article
Multidisciplinary Sciences
Todor E. Vlakhov, Yordan G. Marinov, Georgi B. Hadjichristov, Nicola Scaramuzza
Summary: The electrical conductivity of polymer poly(ethylene oxide) (PEO) and nematic liquid crystals E8 composite films was studied using complex electrical impedance spectroscopy. The results show that the ion-conductive PEO/E8 composite is a promising material for electronic applications.
COMPTES RENDUS DE L ACADEMIE BULGARE DES SCIENCES
(2022)
Article
Chemistry, Multidisciplinary
Georgi B. Hadjichristov
Summary: This mini-review discusses recent findings on ion-conducting composites of polymers and nematic liquid crystals (NLCs) and their current and future applications. These organic composite electrolytes, composed of plastics and nematic soft matter, have become crucial materials for energy storage and conversion devices, as well as organic soft electronics, sensors, and mechatronics. While the physicochemical mechanisms and effects of these polymer/NLCs composites are well-understood, there is a challenge to further improve their electrical conductivity and dielectric and mechanical properties. The efforts in this research direction are important for developing novel ion-conductor materials and expanding their applications.
Article
Chemistry, Physical
Georgi B. Hadjichristov
Summary: This study achieves efficient control of laser light transmission through stationary microperiodic parallel stripe textures in films of nematic liquid crystals (NLCs). By varying the field intensity and the field-induced periodic modulation of the nematic director, the intensity of a linearly polarized laser beam passed through the films can be controlled. In 25 μm-thick films of room-temperature NLCs, a low-voltage (around 4 V) electro-optically controlled transmittance with sharp and deep V-shaped behavior is achieved.
Article
Chemistry, Multidisciplinary
Georgi B. Hadjichristov, Yordan G. Marinov
Summary: This study investigates the photoresponse of a star-shaped molecular structure called liquid-crystallinetris(keto-hydrozone)discotic (TKHD). The study also focuses on TKHD filled with single-walled carbon nanotubes (SWCNTs) at a concentration of 1 wt%. Both TKHD and SWCNT/TKHD nanocomposite films, at room temperature, were in a glassy state and exhibited photoluminescence ranging from deep-red to near-infrared, making them suitable for organic optoelectronics. The addition of SWCNTs stabilized the photoluminescence of TKHD, which is significant for optoelectronic device applications. The reversible photothermoelectrical effect in SWCNT/TKHD films was mediated by SWCNTs and their network, as characterized by electrical impedance spectroscopy.
Article
Nanoscience & Nanotechnology
Georgi Borislavov Hadjichristov, Tzvetan Emilov Ivanov
Summary: In this work, the nanostructure produced in PMMA implanted with Sr ions was studied. A nano-thin bi-layer configuration with carbonaceous nanostructure was formed by controlled chemical modification. The complex nanoscale arrangement and organic transconductance configuration were characterized by electrical measurements.
JOURNAL OF NANO RESEARCH
(2022)
Article
Multidisciplinary Sciences
Todor E. Vlakhov, Georgi B. Hadjichristov, Yordan G. Marinov
Summary: The study focused on the photo-thermal effect in liquid-crystalline nanocomposites (NCs) of tris(keto-hydrozone) discotic liquid crystals (DLC) doped with single-walled carbon nanotubes (SWCNTs) at 1 wt.%. The observed effect, correlated with changes in electrical conductivity, has potential for enhancing the functionality of DLC-based NC materials doped with SWCNTs through photo-control of their liquid-crystalline state.
COMPTES RENDUS DE L ACADEMIE BULGARE DES SCIENCES
(2021)
Article
Multidisciplinary Sciences
Todor E. Vlakhov, George R. Ivanov, Yordan G. Marinov, Georgi B. Hadjichristov
Summary: The study focuses on experimental investigation of phospholipid Langmuir-Blodgett (LB) films for detecting vapours of volatile organic compounds like acetone and methanol at room temperature. By depositing LB molecular monolayers of phospholipid dipalmitoyl-phosphatidyl-ethanolamine (DPPE) on Surface Acoustic Wave Resonator (SAWR), the impedance response of the DPPE LB films was significantly changed, making them suitable for gas sensing applications.
COMPTES RENDUS DE L ACADEMIE BULGARE DES SCIENCES
(2021)
Article
Multidisciplinary Sciences
Yordan G. Marinov, Georgi B. Hadjichristov
COMPTES RENDUS DE L ACADEMIE BULGARE DES SCIENCES
(2020)
Article
Multidisciplinary Sciences
Ginka K. Exner, Yordan G. Marinov, Georgi B. Hadjichristov
COMPTES RENDUS DE L ACADEMIE BULGARE DES SCIENCES
(2020)
