Article
Geosciences, Multidisciplinary
Mutlaq Alarouj, Harry Collini, Matthew D. Jackson
Summary: The zeta potential in natural sandstones is typically negative, but in this study, sandstone samples containing dolomite and siderite showed positive zeta potentials. This unexpected result was attributed to the adsorption of divalent ions onto mineral surfaces and ion exchange processes. The findings emphasize the importance of realistic experimental conditions in measuring zeta potential and highlight the impact of zeta potential on geophysical monitoring and contaminant transport in sandstone aquifers.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Engineering, Chemical
Madhurima Dutta, Shivam Upadhyay, Sirshendu De
Summary: In this study, a correlation between effective membrane pore charge density and measurable quantities such as membrane surface zeta potential and initial feed concentration was found through experiments and calculations. The Donnan Steric Pore Model was used for analysis, demonstrating that membrane pore charge density can be estimated by measuring zeta potential and feed concentration.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Chemistry, Applied
A. Serrano-Lotina, R. Portela, P. Baeza, V. Alcolea-Rodriguez, M. Villarroel, P. Avila
Summary: The importance of the isoelectric point in the preparation and characterization of functional materials, particularly industrial catalysts, is highlighted. The article introduces the basic principles and provides relevant examples to explain the possibilities for materials design. It discusses the measurement of zeta potential for controlling synthesis and coating of supports, as well as the influence of binders on support properties.
Article
Pharmacology & Pharmacy
Rui Zong, Hainan Ruan, Wenzheng Zhu, Peng Zhang, Zhaojun Feng, Chanmin Liu, Shaohua Fan, Huamin Liang, Jun Li
Summary: Curcumin (CUR) nanocrystals (NCs) were developed in this study to improve water solubility and stability, with the findings indicating that CUR NCs with high positive surface charge exhibited superior antibacterial activity against E. coli and S. aureus compared to free CUR.
JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
(2022)
Article
Energy & Fuels
Kasavajhula Naga Vasista, Sumit Kumar Mehta, Sukumar Pati
Summary: The electroosmotic mixing characteristics in a hydrophobic microchannel with interfacial slip dependent heterogeneous surface charge are investigated. Two different flow regimes are identified, and the effect of interfacial slip on mixing performance is significant.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2022)
Article
Chemistry, Physical
Elton L. Correia, Siddharth Thakur, Aanahita Ervin, Emma Shields, Sepideh Razavi
Summary: Mixed systems of nanoparticles and surfactants have a wide range of applications and their behavior is influenced by various factors such as surface charge, particle's wettability, surfactant solubility, and solution conditions. The previous studies mainly focused on systems with opposite charges, while the behavior of systems with like-charged species remains poorly understood. This study investigates the adsorption of surfactant onto negatively charged particles and provides valuable insights into this complex topic.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Review
Chemistry, Physical
Shiva Mohammadi-Jam, Kristian E. Waters, Richard W. Greenwood
Summary: This article reviews the use of the electroacoustic technique in determining the zeta potential of concentrated aqueous suspensions and emphasizes the importance of identifying the isoelectric points for colloidal stability and processing. The application of the technique in polymer lattices is also summarized.
ADVANCES IN COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Physical
Harry Collini, Matthew D. Jackson
Summary: Despite the wide range of interest and applications, the controls on surface charge of crude oil in aqueous solution are not well understood. This study collates and reviews previous measurements of zeta potential on crude oil, compares and contrasts the results, and reports new measurements of zeta potential on crude oil wetting films and layers. The results show that the zeta potential depends on electrolyte pH and the concentration of divalent ions Ca2+ and Mg2+. Lower pH and higher concentration of these divalent ions lead to more positive zeta potential. The findings have important implications for engineering and industrial activities involving crude oil.
ADVANCES IN COLLOID AND INTERFACE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Brent Ciftja, Cal Colbert-Pollack, Orion Ciftja, Lindsey Littlejohn
Summary: The study focuses on analyzing the electrostatic potential of a hemisphere with uniform surface charge density and attempting to find analytical expressions. Compact analytical results are obtained for special cases, but it is noted that obtaining a general expression for the electrostatic potential at an arbitrary point in space would be very difficult.
RESULTS IN PHYSICS
(2021)
Article
Biotechnology & Applied Microbiology
Maud Weiss, Jiahui Fan, Mickael Claudel, Thomas Sonntag, Pascal Didier, Carole Ronzani, Luc Lebeau, Francoise Pons
Summary: This study clearly demonstrates that the surface charge density of a cationic carbon NP rather than the absolute value of its zeta-potential is a relevant descriptor of its in vitro and in vivo toxicity. The study found that among the cationic carbon NPs examined, only NP5 and NP6 with the highest surface charge density induced significant oxidative stress, IL-8 release, mitochondrial dysfunction, and loss in lysosomal integrity in cells. Additionally, NP5 and NP6 were the only NPs to induce airway inflammation in mice, with NP5 also increasing allergen-induced immune response, airway inflammation, and mucus production.
JOURNAL OF NANOBIOTECHNOLOGY
(2021)
Article
Cell Biology
Leixin Ouyang, Rubia Shaik, Ruiting Xu, Ge Zhang, Jiang Zhe
Summary: Cellular functions are regulated by cell surface charges and understanding these functions requires noninvasive measurement of surface charge distribution of a single cell. This study introduces a method for cell surface charge mapping via photoelectric interactions. The method involves placing a cell on a microelectrode array and analyzing the reflected light intensity to quantify the cell surface charge distribution. The method was validated using charged microparticles and different types of cells.
Article
Chemistry, Physical
Sam Gorman, Kirstie Rickaby, Li Lu, Christopher J. Kiely, Donald E. Macphee, Andrea Folli
Summary: This study investigates the doping of TiO2-based nanomaterials in semiconductor-sensitised photoreactions, highlighting the importance of modified band structures, energetics of band gaps, and redox potentials in enhancing light harvesting capabilities. The research demonstrates how surface chemistry of doped TiO2 nanoparticles, including surface charge density and potentials, is influenced by the nature and loading of dopants, providing insights into the role of doping in improving photocatalytic activity.
Article
Chemistry, Physical
Karishma Jain, Aleksandar Y. Mehandzhiyski, Igor Zozoulenko, Lars Wagberg
Summary: The study focuses on the particle morphology, size, charge density, and zeta potential of PEDOT:PSS dispersion, showing significant changes with pH levels and ionic strengths. The molecular model developed accurately represents the characteristics of PEDOT:PSS nanoparticles in aqueous dispersion. The results provide new insights and a deep understanding of the morphology and zeta potential evolution in PEDOT:PSS dispersion.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Huiyuan Wu, Shaoke Fu, Wencong He, Chuncai Shan, Jian Wang, Yan Du, Shihe Du, Bangxing Li, Chenguo Hu
Summary: This study reports a fast surface charge injection technique based on air breakdown effect, which allows for directional accumulation of charge and improves the output performance of triboelectric nanogenerator. A novel charge transfer mechanism is proposed, and a method for quantifying surface charge density is given.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Review
Pharmacology & Pharmacy
Nisha Gulati, Kamal Dua, Harish Dureja
Summary: Nanomedicines have been widely used in human healthcare for various purposes, such as prevention, early detection, diagnosis, treatment, and follow-up of illnesses. The surface charge of nanomedicines is crucial in determining their interaction with biological components, and the zeta potential is a useful tool for describing their chemical composition. This review provides an overview of how nanomedicines' surface charges impact absorption, distribution, metabolism, and in vivo drug release. It also highlights the potential of altering nanomedicines' surface characteristics with various polymers to enhance their therapeutic efficacy.
CURRENT DRUG DELIVERY
(2023)
Article
Mechanics
Pradipta K. Das, Anoop K. Gupta, Neelkanth Nirmalkar, Raj P. Chhabra
KOREA-AUSTRALIA RHEOLOGY JOURNAL
(2015)
Article
Engineering, Chemical
A. Biswas, Pradipta Kr. Das, Verrender Singh
Article
Nanoscience & Nanotechnology
Pradipta Kr. Das
MICROFLUIDICS AND NANOFLUIDICS
(2017)
Article
Biochemical Research Methods
Pradipta Kr Das
Article
Mechanics
Pradipta Kr. Das, Arthur D. Snider, Venkat R. Bhethanabotla
Article
Mechanics
Pradipta Kr Das, Arthur David Snider, Venkat R. Bhethanabotla
Article
Chemistry, Analytical
Mandek Richardson, Pradipta K. Das, Samuel Morrill, Kamlesh J. Suthar, Subramanian K. R. S. Sankaranarayanan, Venkat R. Bhethanabotla
Summary: This study utilized Rayleigh waves in ST-Quartz devices to efficiently remove non-specific protein binding, improving the performance of label-free biosensors; acoustic streaming prevented reattachment of particles by overcoming adhesive forces at various frequencies; results indicate that ST-Quartz enables integration of functions for removal of non-specific binding, mixing, and sensing on a single chip.
Article
Nanoscience & Nanotechnology
Gamze Celik Cogal, Pradipta K. Das, Gozde Yurdabak Karaca, Venkat R. Bhethanabotla, Aysegul Uygun Oksuz
Summary: This study focuses on utilizing surface acoustic wave (SAW) systems to enhance the detection limit of the cancer-related biomarker miRNA-21 by immobilizing probe dye-labeled single-stranded DNA on Au/Pt micromotors that recognize the target miRNA-21. The speed and fluorescence intensity changes of the micromotors in response to miRNA-21 concentration variation were studied under both with and without SAW conditions, showing a linear relationship. The resulting fluorescence sensor demonstrated a lower limit of detection of 0.19 nM, which was more than 2 folds lower compared to conditions without SAW, indicating the effectiveness of acoustic removal systems in improving the sensor performance.
ACS APPLIED BIO MATERIALS
(2021)
Article
Biotechnology & Applied Microbiology
Yuqi Huang, Pradipta Kr Das, Venkat R. Bhethanabotla
Summary: This paper reviews the utilization of surface acoustic waves in biosensing applications, including theoretical aspects of acoustic wave propagation in a liquid medium and different types of SAWs generated on piezoelectric substrates. It also presents advancements in SAW biosensor design and different sensing capabilities of SAW devices in various biosensing applications, as well as techniques to address biofouling challenges.
SENSORS AND ACTUATORS REPORTS
(2021)
Article
Chemistry, Physical
Pradipta Kr. Das
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2017)
Article
Engineering, Multidisciplinary
P. K. Das, S. Sarkar, S. K. Ajmani
JOURNAL OF FAILURE ANALYSIS AND PREVENTION
(2017)
Article
Engineering, Biomedical
Gamze Celik Cogal, Pradipta Kr Das, Shuangming Li, Aysegul Uygun Oksuz, Venkat R. Bhethanabotla
Summary: A hybrid micromotor containing a conjugated polymer and a catalytic structure was developed, with its movement characterized under both chemical power and acoustic power. A theoretical model was used to predict and control the micromotor movement, achieving excellent agreement with experimental results and providing on/off control through design of geometries and acoustic field strengths.
ADVANCED NANOBIOMED RESEARCH
(2021)