Article
Engineering, Electrical & Electronic
Ryota Fukuzawa, Daichi Kobayashi, Takuji Takahashi
Summary: Electrostatic force microscopy (EFM) is used to examine the electrostatic force between an AFM tip and sample surface, allowing evaluation of their capacitance and surface potential. The dependences of the electrostatic force on dc voltage and ac voltage frequency can be used to investigate carrier density, carrier type, and deep-level states in a semiconductor. Proper distance control is necessary in EFM to ensure accurate measurements, and the oscillation amplitude of a cantilever can be effectively used for feedback control. The 1 A-mode operation in EFM shows good robustness against the strong electrostatic force and allows proper measurements of tip-sample capacitance.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Chemistry, Multidisciplinary
Paolo Pellegrino, Isabella Farella, Mariafrancesca Cascione, Valeria De Matteis, Alessandro Paolo Bramanti, Antonio Della Torre, Fabio Quaranta, Rosaria Rinaldi
Summary: In recent years, Atomic Force Microscope (AFM)-based nanolithography techniques have become increasingly powerful. However, conventional methods are inefficient, have low pattern formation rates, and are complex to execute. In this study, we developed a simple and effective nanopatterning technique called Pulse-Atomic Force Lithography (P-AFL), which enabled us to pattern 2.5D nanogrooves on a thin polymer layer with sub-nanometre resolution, high accuracy, and reproducibility. We investigated the effects of P-AFL parameters on the morphology of 2.5D nanostructures and optimized the nanolithography process to achieve unconventional shape nanostructures with high accuracy and fidelity.
Article
Chemistry, Multidisciplinary
Tianyao Zhang, Haibo Yu, Jialin Shi, Xiaoduo Wang, Hao Luo, Daojing Lin, Zhu Liu, Chanmin Su, Yuechao Wang, Lianqing Liu
Summary: This paper proposes an imaging method that combines atomic force microscopy with microlens-based scanning optical microscopy, which can achieve cross-scale rapid imaging and improve the efficiency of large-scale imaging and detection.
Article
Chemistry, Physical
A. Rodriguez, M. S. Jaman, O. Acikgoz, B. Wang, J. Yu, P. G. Grutzmacher, A. Rosenkranz, M. Z. Baykara
Summary: Ti3C2Tx nano-sheets exhibit solid lubrication properties on the nanoscale, reducing friction on silicon dioxide substrates, although not as effectively as few-layer graphene. This paves the way for further investigations into nanoscale solid lubrication achieved by Ti3C2Tx (MXene) nano-sheets.
APPLIED SURFACE SCIENCE
(2021)
Article
Engineering, Chemical
Sheng Liu, Yan Dong, Lei Xie, Guangyi Liu, Hong Zhong, Hongbo Zeng
Summary: In this study, a new chemical additive, HAPTC, was developed for the selective flotation separation of galena and sphalerite. AFM imaging revealed a stronger adsorption affinity of HAPTC towards galena compared to sphalerite. The results suggest that HAPTC has potential for developing novel reagents for mineral flotation.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Materials Science, Composites
Ayse Cagil Kandemir, Fatma Donmez, Hatice Kaplan Can
Summary: This study focuses on achieving mechanical enhancements in biocompatible organic coatings by using solvent-based method to produce biocompatible nanocomposites. The addition of bentonite nanoclays as constituents leads to significant improvements in mechanical properties. The increase in volume fraction of bentonite nanoclays is primarily responsible for the considerable enhancements in hardness and modulus values.
POLYMER COMPOSITES
(2023)
Article
Chemistry, Multidisciplinary
Yijie Liu, Xuexuan Li, Yuliang Zhang, Lin Ge, Yingchun Guan, Zhen Zhang
Summary: This study presents a novel approach, the ultra-large scale stitchless atomic force microscopy (ULSS-AFM), which combines a compliant nano-manipulator (CNM) to enable high-throughput characterization of an area of up to 1 x 1 mm(2). Experimental results demonstrate the effectiveness of the ULSS-AFM in different scanning ranges, modes, resolutions, and frequencies. Compared to conventional AFMs, this approach allows for the characterization of ultra-large scale samples without stitching or bow errors, expanding the scanning area of traditional AFMs by two orders of magnitude and opening up important avenues for cross-scale scientific research and industrial applications in nano- and microscale.
Article
Construction & Building Technology
Le T. Pham, Steven M. Cramer
Summary: This study examined the properties of air bubbles extracted from air-entrained cement paste using new techniques such as atomic force microscopy and scanning electron microscopy. The results showed that air bubbles associated with synthetic AEAs had thinner and more-flexible shells than those with neutralized vinsol resin. The stiffness and thickness of the bubble shells were correlated with the stability of air bubbles in concrete.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2022)
Article
Engineering, Multidisciplinary
Sen Gu, Miao Hao, Peng Pan, Xin Li, Junhui Zhu, Yong Wang, Changhai Ru
Summary: The novel SEM-based integrated nanoindentation, nanoscratch, and atomic force microscopy (AFM) instrument showed promise but faced the challenge of PRC signal drift due to electron irradiation from SEM. A method to reduce PRC signal drift was proposed and validated in this study.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2021)
Article
Chemistry, Applied
Sicong Yan, Shuai Yuan, Qian Zhang, Man Luo, Dongling Qiao, Fatang Jiang, Hong Qian
Summary: This study investigated the effects of drying temperature, plasticizer type and dosage on the molecular structure of konjac glucomannan (KGM), agar, and curdlan polysaccharides. The results showed that the molecular morphology of different polysaccharides changed at different drying temperatures. Adding a suitable amount of plasticizer can relieve the shrinkage of hydrophilic polysaccharide molecular chains during drying. Glycerol showed better performance in relieving molecular chain shrinkage compared to Tween 20 and Tween 80. Lastly, a new method for preparing polysaccharide samples for atomic force microscopy (AFM) was proposed, which provided a new idea for observing polysaccharide morphology.
FOOD HYDROCOLLOIDS
(2023)
Article
Engineering, Mechanical
Zihan Li, Yongda Yan, Jiqiang Wang, Chen Li, Yanquan Geng
Summary: The formation mechanism of bundle structures on polycarbonate surfaces is investigated by reciprocal scratching experiments. The bundle structure is accumulated by the continuous stacking of the plowed sample materials, and the stick-slip behavior is enhanced with increased scratching times. This work reproduces the formation process of bundle structure in experiments for the first time and provides further insight into the friction behavior of polymers.
Article
Polymer Science
Liliana Porojan, Roxana Diana Vasiliu, Mihaela Ionela Birdeanu, Sorin Daniel Porojan
Summary: The study aimed to investigate the effect of different surface treatments on the surface morphology of different resin composite materials. The results showed that sandblasting, tribochemical treatment, and etching could increase surface roughness, while polishing and glazing could make the surface smoother. Surface roughness values were within clinically acceptable limits for all tested methods.
Letter
Chemistry, Multidisciplinary
Pauline J. Kolbeck, Mihir Dass, Irina V. Martynenko, Relinde J. A. van Dijk-Moes, Kelly J. H. Brouwer, Alfons van Blaaderen, Willem Vanderlinden, Tim Liedl, Jan Lipfert
Summary: Atomic force microscopy (AFM) is a powerful technique for high-resolution imaging of molecules, macromolecular complexes, and nanoparticles. However, the shape of the AFM tip can distort the images. In this study, we use a 3D DNA origami structure as a fiducial for tip reconstruction and image correction. The fiducial has sharp steps at different heights, allowing reliable tip reconstruction with as few as ten fiducials. This fiducial enables accurate and precise AFM imaging for a wide range of applications.
Article
Biochemical Research Methods
Maximilian Winzely, Annukka Jouppila, Georg Ramer, Laurin Lux, Bernhard Lendl, Karina Barreiro, Riitta Lassila, Gernot Friedbacher
Summary: Antiplatelet and anticoagulant drugs are categorized as antithrombotic agents to reduce blood clot formation, however, combining drugs with different mechanisms of action increases the risk of bleeding. Dual anticoagulant and antiplatelet (APAC) is a novel semisynthetic antithrombotic molecule that offers potential clinical applications. Studies using atomic force microscopy (AFM) to characterize APAC structure and investigate molecular interactions with von Willebrand factor (VWF) have shown promise in understanding its biological function.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2022)
Article
Engineering, Biomedical
Andreas Stylianou, Chrysovalantis Voutouri, Fotios Mpekris, Triantafyllos Stylianopoulos
Summary: Cancer progression is closely associated with changes in the tumor microenvironment (TME) structure and mechanical properties. Desmoplasia, mainly caused by collagen overproduction, leads to tumor stiffness and hinders drug delivery. Understanding the mechanisms involved in desmoplasia and identifying nanomechanical and collagen-based properties can lead to the development of diagnostic and prognostic biomarkers. In this study, in vitro experiments using pancreatic cell lines and orthotopic tumor models demonstrated that invasive cells are softer with elongated shapes and aligned stress fibers. The study also found distinct nanomechanical and collagen-based optical properties in pancreatic cancer, which can be potential biomarkers for monitoring tumor progression and treatment outcomes.
ANNALS OF BIOMEDICAL ENGINEERING
(2023)
Article
Chemistry, Physical
Peter A. Ajibade, Fartisincha P. Andrew, Amos A. Fatokun, Abimbola E. Oluwalana
Summary: The complexes of Mn(II), Co(II), Cu(II), Zn(II), and Pt(II) with 2-(((4-methoxyphenyl)amino)methyl)phenolyl dithiocarbamato have been synthesized and characterized. In vitro screening showed that Co(II) and Zn(II) had the most potent anticancer effects on MRC5-SV2 cancer cells, providing a potential direction for further research on inorganic complexes as anticancer drugs.
JOURNAL OF MOLECULAR STRUCTURE
(2021)
Article
Chemistry, Multidisciplinary
Abimbola E. Oluwalana, Peter A. Ajibade
Summary: Tin sulfide nanoparticles were successfully prepared from single source precursors and utilized as efficient photocatalysts for the degradation of various dyes under visible light irradiation. The results demonstrated the effectiveness of the SnS nanoparticles in degrading organic dyes, with high degradation efficiencies observed for brilliant green, crystal violet, methylene blue, and methyl red dyes. Liquid chromatography-mass spectrometry was used to investigate the degradation pathway, while the impact of irradiation time, scavengers, and photostability on the photocatalysis process was also evaluated.
JOURNAL OF SULFUR CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
P. A. Ajibade, N. Solomane, B. M. Sikakane
Summary: The paper presents the preparation, morphological characterization, and photocatalytic performance of zinc sulfide nanoparticles synthesized from zinc(II) dithiocarbamate precursors. The results demonstrate the nanoparticles' effectiveness in degrading methylene blue dye.
CHALCOGENIDE LETTERS
(2022)
Review
Biochemistry & Molecular Biology
Peter A. Ajibade, Solomon O. Oloyede
Summary: This article explores various synthetic strategies of metal-organic frameworks (MOFs), quantum dots (QDs), and metal-organic framework quantum dots composites (MOFs@QDs) as efficient compounds for the sensing of ecological pollutants, contaminants, and toxicants such as endocrine-disrupting chemicals (EDCs). It also summarizes the compounds or materials used in the detection of bisphenol A (BPA) and the sensing ability of MOFs, QDs, and MOFs@QDs composites for EDCs and BPA.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Chemistry, Physical
Zintle Fudo, Peter A. Ajibade, Ayodele T. Odularu
Summary: In this study, five heteroleptic ruthenium(II) polypyridyl complexes were successfully synthesized and characterized. The results showed that these complexes have potential applications in dye-sensitized solar cells due to their high photophysical properties and enhanced dye-sensitizing abilities.
INTERNATIONAL JOURNAL OF PHOTOENERGY
(2022)
Article
Multidisciplinary Sciences
Qing Yang, Kayode Olaifa, Fartisincha P. Andrew, Peter A. Ajibade, Obinna M. Ajunwa, Enrico Marsili
Summary: Dithiocarbamate-zinc metal complex is effective in inhibiting the biofilm of Acinetobacter baumannii by degrading the cell membrane and reducing biofilm formation.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
Peter A. Ajibade, Athandwe M. Paca, Moganavelli Singh
Summary: We investigated the influence of thermolysis time on the morphological, optical, and anticancer properties of palladium sulfide (PdS) nanoparticles. Our results showed that the palladium sulfide nanoparticles maintained a tetragonal crystalline phase regardless of the thermolysis time. The nanoparticles exhibited spherical shapes with particle sizes ranging from 3.00 to 5.10 nm, and the optical band gaps decreased with increasing thermolysis time. Furthermore, the palladium sulfide nanoparticles showed potential anticancer activity against HeLa cells.
Article
Chemistry, Inorganic & Nuclear
Athandwe M. Paca, Moganavelli Singh, Peter A. Ajibade
Summary: The synthesis, spectroscopic characterization, and in vitro cytotoxic evaluation of five ruthenium(III) dithiocarbamate complexes were reported. The complexes showed moderate cytotoxic activity against human embryonic kidney (HEK293) and cervical cancer (HeLa) cells, with one complex exhibiting the highest activity in both cell lines.
JOURNAL OF COORDINATION CHEMISTRY
(2022)
Article
Chemistry, Physical
Peter A. Ajibade, Amos A. Fatokun, Athandwe M. Paca
Summary: In this study, a new organoruthenium(II) complex was synthesized and characterized. The complex exhibits a centrosymmetric binuclear structure and shows potent cytotoxicity against cervical and lung cancer cell lines. The compound outperformed cisplatin in terms of cytotoxic potency, highlighting its potential as an anti-cancer agent.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Chemistry, Multidisciplinary
Athandwe M. Paca, Saheed O. Benson, Amos A. Fatokun, Peter A. Ajibade
Summary: Four organoruthenium(II) arene dithiocarbamate complexes were synthesized and characterized. The complexes showed promising cytotoxic effects against human cervical cancer and human lung fibroblast cell lines. Two compounds, C1 and C3, exhibited potent cytotoxicity and demonstrated potential as anticancer agents.
JOURNAL OF SULFUR CHEMISTRY
(2024)
Article
Chemistry, Multidisciplinary
Thandi B. Mbuyazi, Peter A. Ajibade
Summary: Octylamine-capped iron oxide nanoparticles (Fe3O4-OTA), 1-dodecanethiol-capped iron oxide nanoparticles (Fe3O4-DDT), and tri-n-octylphosphine-capped iron oxide nanoparticles (Fe3O4-TOP) were prepared by co-precipitation method. The iron oxide nanoparticles exhibited inverse spinel crystalline phases and mean particle sizes of 2.1 nm, 5.0 nm, and 4.4 nm for Fe3O4-OTA, Fe3O4-DDT, and Fe3O4-TOP, respectively. The energy bandgap of the iron oxide nanoparticles ranged from 2.25 eV to 2.76 eV. Fe3O4-TOP nanoparticles showed the highest efficiency in photocatalytic degradation of methylene blue and methyl orange, and scavenger studies revealed the involvement of electrons (e(-)) and hydroxy radicals (& BULL;OH) in the degradation reaction. The pH of the dye solution also affected the photocatalytic degradation, with pH 10 optimal for methylene blue and pH 2 optimal for methyl orange using the iron oxide photocatalyst. The iron oxide photocatalysts showed recyclability without loss of photocatalytic activity.
Article
Chemistry, Multidisciplinary
Peter A. Ajibade, Thandi B. Mbuyazi, Athandwe M. Paca
Summary: The preparation and crystal structures of bis(diallydithiocarbamato)zinc(II) and silver(I) complexes were reported. These compounds were used as single-source precursors to prepare zinc sulfide and silver sulfide nanophotocatalysts. The resulting nanoparticles exhibited excellent performance in terms of light absorption and the degradation of bromothymol blue and bromophenol blue.
Article
Environmental Sciences
Peter A. Ajibade, Ebenezer C. Nnadozie
Summary: Emerging pollutants are uncontrolled pollutants with negative potentials in the environment. This study investigated the sorption of ketoprofen and benzophenone, representative EPs, from aqueous solutions using manganese ferrite biochar as an adsorbent. The results showed that the adsorbent had a high adsorption capacity and good recyclability, making it an effective method for the removal of emerging contaminants.
ENVIRONMENTAL CHEMISTRY AND ECOTOXICOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Abimbola E. Oluwalana, Peter A. Ajibade
Summary: Tin sulfide nanoparticles were prepared using different tin(ii) dithiocarbamate complexes as precursors. The nanoparticles exhibited orthorhombic crystalline structure, small average particle size, and narrow energy bandgap. They showed efficient photocatalytic performance in the degradation of rhodamine B and phenol, and could be repeatedly used without loss of their photodegradation ability.
NANOTECHNOLOGY REVIEWS
(2022)
Review
Chemistry, Multidisciplinary
Lijo P. Mona, Sandile P. Songca, Peter A. Ajibade
Summary: This review focuses on the synthesis and encapsulation of magnetic iron oxide nanorods and their applications in magnetic hyperthermia and photothermal therapy for cancer cells. The results show that monodisperse magnetic oxide nanorods are more effective in cell death compared to polyhedral-shaped nanoparticles.
NANOTECHNOLOGY REVIEWS
(2022)
