Article
Optics
M. Khadem Sadigh, M. S. Zakerhamidi, A. Ranjkesh
Summary: This study investigates the effects of left-handed chiral dopants and temperature on the electro-optical properties of pure and doped nematic liquid crystals. The results show that the maximum value of the Kerr constant, which is approximately 20 times that of a pure liquid crystal sample, is observed near the transition temperature with a chiral dopant percentage of around 4%. This suggests that doped liquid crystals with high and controllable responses can be used for designing optoelectronic devices.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Biochemistry & Molecular Biology
Valerica Raicu
Summary: This paper presents the derivation of analytical expressions and investigates the distribution of electrical potentials and fields within different layers of a biological cell. The results show differences between the present theoretical model and previous models, as well as amplification of the electric field at the membrane level of cells and organelles.
BIOELECTROCHEMISTRY
(2022)
Article
Geochemistry & Geophysics
Pavel P. Bobrov, Tatyana A. Belyaeva, Elena S. Kroshka, Olga Rodionova
Summary: This is the first of two articles that present experimental spectra of six soil samples with varying clay contents and organic carbon levels. It demonstrates the strong influence of dielectric relaxation processes on the relative effective complex permittivity (RCP) in soils, especially in the presence of clay. Furthermore, it shows that organic carbon can reduce both the real and imaginary parts of the RCP.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2022)
Article
Nanoscience & Nanotechnology
Boris Zabelich, Edgars Nitiss, Anton Stroganov, Camille-Sophie Bres
Summary: This study demonstrates the implementation of thermally assisted electric-field poling in stoichiometric silicon nitride (Si3N4) waveguides. This method allows for the formation of a strong electric field, enabling linear electro-optic modulation and paving the way for the development of chi((2))-based devices on Si3N4.
Article
Engineering, Electrical & Electronic
Saheli Ghosh, Shubham Roy, Souravi Bardhan, Nibedita Khatua, Barsha Bhowal, Dipak K. Chanda, Solanky Das, Dhananjoy Mondal, Ruma Basu, Sukhen Das
Summary: This study investigates the variation of grain size of natural hematite from bulk to nano-scale through ball milling, as well as the changes in electrical properties with decreasing size. The results show an increase in purity with smaller particle size, especially in the nano-domain, and a remarkable augmentation in dielectric permittivity with reduction in size. The high dielectric constants of the smaller sized materials indicate their potential use in energy storage devices.
JOURNAL OF ELECTRONIC MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
P. Mandal, A. Sundaresan
Summary: The study aimed to perturb the cycloidal spin ordering and improve the multiferroic properties of BiFeO3 by substitutions of Al and Sc at the Fe site. The results showed that the compounds with Sc substitution exhibited ferroelectricity at room temperature.
JOURNAL OF ELECTRONIC MATERIALS
(2021)
Article
Materials Science, Ceramics
Ayush Raj, Prabhasini Gupta, R. N. P. Choudhary
Summary: In this study, the effect of lanthanum substitution on the properties of strontium iron niobate was investigated. Lanthanum substitution led to the development of additional phases in the compounds and significant changes in dielectric parameters and transport properties. The study also revealed anomaly and relaxor behavior in the frequency and temperature dependence of dielectric parameters.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
M. Ozturk, M. Okutan, R. Coskun, B. Colak, O. Yalcin
Summary: This study analyzed the morphological, structural, optical, and dielectric properties of hydrogels doped with different doses of Fe3O4 nanoparticles, revealing their relationship with technological applications. It was concluded that hydrogels with high doses of Fe3O4 NPs are suitable for electrochemical biosensors in bio-systems.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Physical
Sipun Mohanty, Samrat Mukherjee
Summary: The study investigated the synthesis, crystal structure, grain size, and dielectric, conductivity, and impedance properties of the double perovskite La(2)FeMn(1-x)CuxO(6). Analysis confirmed the orthorhombic crystal structure and presence of La, Fe, Mn, Cu, and O in the samples. The article discusses the conduction mechanism and polarization behavior of the material under different temperatures.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Review
Electrochemistry
Quan Wu, Shizhao Xiong, Fujun Li, Aleksandar Matic
Summary: This review comprehensively summarizes the failure mechanisms of solid-state electrolytes, including electric failure, (electro)chemical failure, and mechanical failure. By analyzing these failure mechanisms in detail, the researchers provide new insights for the design of future SSLMBs.
BATTERIES & SUPERCAPS
(2023)
Article
Chemistry, Multidisciplinary
Meng-Jia Sun, Randy Sabatini, Pei-Xi Wang, Amin Morteza Najarian, Koen Bertens, Andrew Johnston, Sjoerd Hoogland, Edward H. Sargent
Summary: The study investigates the influence of ion migration on the EO efficiency of mixed halide perovskites, finding that ion migration affects the experimental results of the mixed samples, leading to increased frequency dependence.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Physics, Applied
K. Meera, R. Muralidharan, Y. H. Jeong
Summary: Mixed-valent cobalt manganese spinel oxide with excess manganese was synthesized and characterized. The crystal structure remained unchanged, but significant changes were observed in the magnetic and magnetodielectric properties.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2022)
Article
Chemistry, Multidisciplinary
Cyril Tlou Selepe, Sandile Surprise Gwebu, Thabo Matthews, Tebogo Abigail Mashola, Ludwe Luther Sikeyi, Memory Zikhali, Nobanathi Wendy Maxakato
Summary: Carbon nano-onions (CNOs) were successfully synthesized using flame pyrolysis, with Pd-Sn/CNOs electro-catalysts showing improved performance in methanol and ethanol electro-oxidation under alkaline conditions. The characterization techniques confirmed the structure and properties of the materials, with PdSn alloy formation on the CNO surface contributing to the enhanced catalytic activity.
Article
Engineering, Electrical & Electronic
Mandan Luo, Qing Yang, Funing Dong, Ning Chen, Wei Liao
Summary: In this paper, a novel integrated waveguide wide-band electric field sensing solution is proposed. The sensor efficiently measures electric fields over a wide frequency range by utilizing high efficiency electro-optic energy coupling and detecting output light intensity. It has advantages such as small size, simple structure, and low cost.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Clement Majorel, Adelin Patoux, Ana Estrada-Real, Bernhard Urbaszek, Christian Girard, Arnaud Arbouet, Peter R. Wiecha
Summary: The approach combines exact multipole decomposition with the concept of a generalized field propagator to calculate the exact multipole decomposition for any illumination, allowing for the calculation of total density of multipole modes and optimum illumination field distributions. This formalism is significant for various applications in nano-optics.
Article
Chemistry, Physical
Alexandar M. Zhivkov, Rosen P. Hristov
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2015)
Article
Chemistry, Physical
Svetlana H. Hristova, Alexandar M. Zhivkov
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2015)
Article
Chemistry, Physical
Alexandar M. Zhivkov, Anna Y. Gyurova
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2009)
Article
Physics, Condensed Matter
Alexandar M. Zhivkov, Rosen P. Hristov
JOURNAL OF PHYSICS-CONDENSED MATTER
(2010)
Article
Chemistry, Multidisciplinary
Alexandar M. Zhivkov, Rosen P. Hristov
Article
Biophysics
Svetlana H. Hristova, Alexandar M. Zhivkov
COLLOIDS AND SURFACES B-BIOINTERFACES
(2019)
Article
Biophysics
Svetlana H. Hristova, Alexandar M. Zhivkov
COLLOIDS AND SURFACES B-BIOINTERFACES
(2019)
Article
Oncology
Svetlana H. Hristova, Alexandar M. Zhivkov
Summary: The study demonstrates the potential of composite cytC-MM particles in effectively killing cancer cells, with optimized conditions and concentration ratios identified. These composite particles have potential application in anticancer therapy for superficial neoplasms of the skin and the alimentary system.
CANCER NANOTECHNOLOGY
(2021)
Article
Pharmacology & Pharmacy
Svetlana H. Hristova, Alexandar M. Zhivkov
Summary: Montmorillonite (MM) colloid nanoplates are effective carriers for drug delivery due to their high adsorption capacity. By adsorbing the mitochondrial protein cytochrome c (cytC) onto MM plates, the composite cytC-MM particles exhibit anticancer properties when phagocytized by cancer cells, leading to apoptosis and cell death. This study investigated the physicochemical properties of cytC-MM particles at different cytC concentrations and found a linear relationship between cytotoxicity and particle concentration, with a cytotoxicity reaching 97%.
Review
Polymer Science
Alexandar M. Zhivkov, Trifon T. Popov, Svetlana H. Hristova
Summary: Hydrogels, when combined with nanoparticles, show increased drug-absorption capacity, making them suitable for use as carriers of anticancer chemotherapeutics. This review focuses on composite hydrogels with hydrophobic and hydrophilic nanoparticles, emphasizing the surface properties of the nanoparticles formed from various substances. The physicochemical properties of the nanoparticles are discussed to assist researchers in selecting the appropriate nanoparticles for drug adsorption.
Article
Polymer Science
Alexandar M. M. Zhivkov, Svetlana H. H. Hristova
Summary: This study investigates the optical anisotropy of agarose gels containing or not containing bacteriorhodopsin purple membranes. It introduces a method to separate electrically induced and spontaneous anisotropy in composite gels. By calculating the isoelectric points and surface electric potential, the electric asymmetry of bacteriorhodopsin trimer and purple membranes is explained, allowing for modulation of the effective pore size and improving the separation capability of electrophoresis in composite gels.
Article
Multidisciplinary Sciences
Svetlana H. Hristova, Alexandar M. Zhivkov
COMPTES RENDUS DE L ACADEMIE BULGARE DES SCIENCES
(2019)
Article
Chemistry, Physical
Alexandar M. Zhivkov, Rosen P. Hristov
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2017)
Article
Optics
Alexandar Metodiev Zhivkov
Article
Optics
Alexandar Metodiev Zhivkov
Article
Biophysics
Cristina Potrich, Anna Pedrotti, Cecilia Pederzolli, Lorenzo Lunelli
Summary: This study developed different functional surfaces for capturing exosomes and verified their effectiveness through experiments. Among them, the negatively-charged surface performed the best, capturing a large number of exosomes and successfully analyzing their biomarkers.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2024)
Article
Biophysics
Brojendra Nath Saren, Srushti Mahajan, Mayur Aalhate, Rahul Kumar, Essha Chatterjee, Indrani Maji, Ujala Gupta, Santosh Kumar Guru, Pankaj Kumar Singh
Summary: This study developed P-selectin-targeted dasatinib nanoparticles coated with chitosan and fucoidan (DST-CH-FUC-NPs), which showed sustained release, reduced hemolytic potential, increased cytotoxicity and cellular uptake compared to free dasatinib. These nanoparticles also demonstrated enhanced ROS production, mitochondrial membrane potential damage, apoptosis induction, cell migration inhibition, and disruption of lysosomal membrane integrity.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2024)
Article
Biophysics
Weiping Deng, Xiaohui Li, Ya Li, Zhongbing Huang, Yulin Wang, Ning Mu, Juan Wang, Tunan Chen, Ximing Pu, Guangfu Yin, Hua Feng
Summary: This study demonstrates the importance of chirality in nerve repair by constructing a GO-phenylalanine derivative hydrogel system. In vivo experiments show that the dextro group significantly improves functional recovery and histological restoration in rat sciatic nerve repair models. The doped GO promotes angiogenesis and myelination. These results suggest that chirality plays a crucial role in promoting nerve regeneration.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2024)
Article
Biophysics
Xiaoyan Wang, Jin Gao, Yu Gao, Linlin Zhang, Congchao Xu, Qintong Li, Lin Li, Jianliang Xue
Summary: In this study, a highly effective surfactant producer strain, Bacillus Cereus GX7, was isolated from the oil tank bottom sludge of Shengli Oil Field in China. The biosurfactant produced by GX7 was identified as surfactin, a lipopeptide surfactant, through TLC, FT-IR, and LC-MS/MS analysis. The fermentation process of GX7 was optimized using single-factor experiments, focusing on the composition of fermentation medium and fermentation conditions. Glucose and peptone were found to be the best carbon and nitrogen sources, and the optimum temperature, inoculum amount, pH, rotation speed, and fermentation time for the strain were determined to be 30°C, 1%, 7.5, 150 rpm, and 48 h, respectively. After optimization, the surface tension and emulsification index of the fermentation broth were 26.84 mN/m and 57.84%, respectively. Furthermore, the biosurfactant produced by GX7 demonstrated good stability over a wide range of temperature, pH, and salt concentration.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2024)
Article
Biophysics
Rodney Marcelo do Nascimento, Christine Grauby-Heywang, Houssem Kahli, Nesrine Debez, Laure Beven, Ivan Helmuth Bechtold, Touria Cohen Bouhacina
Summary: This article presents a theoretical model based on thermodynamic rules to assess the early stages of bacterial biofilm formation on different material surfaces. By utilizing morphological characteristics of bacteria and Atomic Force Microscopy images, the model generates a dataset of energetically minimized states, which can be correlated with bacterial adhesion states.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2024)
Article
Biophysics
Filipa A. L. S. Silva, Licinia Timochenco, Raquel Costa-Almeida, Jose Ramiro Fernandes, Susana G. Santos, Fernao D. Magalhaes, Artur M. Pinto
Summary: The study demonstrates that by photoreducing nanosized graphene oxide using ultraviolet radiation, nanometric particles with high light-to-heat conversion efficiency and water stability can be obtained. These nanomaterials exhibit high absorption in the near-infrared region and show no cytotoxicity towards human cells, indicating their potential for safe therapy.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2024)
Article
Biophysics
D. Costa, V. De Matteis, F. Treso, G. Montani, M. Martino, R. Rinaldi, M. Corrado, M. Cascione
Summary: This review primarily discusses the relationship between contact lens discomfort (CLD) and the surface properties of contact lenses (CLs), specifically the coefficient of friction (CoF). The review emphasizes the importance of introducing a standardized protocol for measuring CoF and calls for a more precise evaluation of the relationship between surface properties and comfort in CLs users.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2024)
Article
Biophysics
Debdip Brahma, Tamal Sarkar, Rupal Kaushik, Akshay Narayan Sarangi, Amar Nath Gupta
Summary: This in-vitro study evaluates the effect of reactive oxygen species (ROS) on the structural rearrangement of elastin. The results show that oxidative stress leads to a decrease in protein size and changes in secondary structure, potentially promoting protein aggregation. This study is important for therapeutics aiming to prevent elastin degradation and aging.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2024)
Article
Biophysics
Xin Yang, Qiang Wang, Chaoxi Yan, Degang Huang, Yinchang Zhang, Huazheng He, Shouliang Xiong, Congming Li, Pingbo Chen, Tingjun Ye, Dan Hu, Lei Wang
Summary: This study presents a practical and effective strategy to improve osseointegration in patients with osteoporosis. By coating titanium implants with polydopamine followed by strontium modification, the bi-functional implants promote bone regeneration and immune regulation. The results show good biocompatibility, sustained release of strontium ions, and stable osseointegration between bone tissues and implants.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2024)
Article
Biophysics
Sengwang Fu, Jianping Zhu, Zhijun Jiang, Yue Cao, Yufei Chen, Lihao Zhang, Sunlong Li, Weipeng Lu, Chengbin Miao, Qing He, Qi Li, Weixing Zhang, Lehao Ren, Yachun Li, Hongchao Shi, Cihui Liu
Summary: Effective management of biofluids is crucial for in vivo surgical interventions. Recent advances include self-sealing needles, drug-eluting stents, and shear-thinning hydrogels. However, complications associated with intestinal mucosal injury and secondary damage still persist. In this study, researchers developed an interpenetrating Janus wettability stent coating that enables unidirectional draining of excessive biofluid. They also demonstrated directional biofluid movement using a self-pumping dressing with potential applications in biofluid collection and disease diagnosis through metal ion detection. This integrated system presents an opportunity for designing wound dressings with effective biofluid management and metal ion detection capabilities.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2024)
Article
Biophysics
Maryam Hassani, Mojtaba Kamankesh, Mazda Rad-Malekshahi, Kobra Rostamizadeh, Farhad Rezaee, Ismaeil Haririan, Seyed Mojtaba Daghighi
Summary: Bacterial adhesion and biofilm formation on the surface of biomaterial implants is a critical problem, and a polymer brush coating with antiadhesive and antimicrobial properties has proven to be highly effective in resolving this issue.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2024)
Article
Biophysics
Huaihong Zhang, Na Liu, Yuting Zhang, Hui Cang, Zhaosheng Cai, Ziqun Huang, Jun Li
Summary: A functionalized cationic polymer, CR-PQAC, was designed and synthesized for photothermal enhanced antimicrobial therapy. The CR-PQAC nanoparticles exhibited significant antibacterial activity and low cytotoxicity against mammalian cells.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2024)
Article
Biophysics
Ipsita Sahu, Priyadarshi Chakraborty
Summary: Peptide nanotechnology bridges the gap between materials and biological worlds by utilizing self-assembly of short-peptide building blocks. Hydrogels engineered from these short peptides show great potential in biomedical applications, but their weak mechanical properties and limited functional diversity need to be addressed. Nanoengineering the networks of these hydrogels by incorporating small molecules, polymers, and inorganic/carbon nanomaterials can enhance their mechanical properties and expand their functional diversity.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2024)
Article
Biophysics
Hao Wei, Yajun Gu, Ao Li, Panpan Song, Dingding Liu, Feihu Sun, Xiaofeng Ma, Xiaoyun Qian
Summary: In this study, a stable three-dimensional conductive hydrogel was prepared by cross-linking MXenes to Matrigel hydrogel. The conductive hydrogel promotes the proliferation and differentiation of NSCs, providing new strategies for neural tissue engineering.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2024)
Article
Biophysics
Yue Zhong, Xiaoli Ge, Juan Zhang, Qun Wei, Feng Wang, Yongke Zhong
Summary: The effect of oxygenic groups on the hemocompatibility of activated carbon was studied through liquid-phase oxidation and subsequent heat treatment. Results showed that the presence of oxygenic groups improved hemocompatibility, while their removal decreased it.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2024)
