Daniel Mandler
@huji.ac.il
Institute of Chemistry
Hebrew University of Jerusalem
RESEARCH, TEACHING, or OTHER INTERESTS
Materials Chemistry, Electrochemistry, Analytical Chemistry, Ceramics and Composites
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Guy Naim, Shlomo Magdassi, and Daniel Mandler
MDPI AG
A novel approach, i.e., Continuous Material Deposition on Filaments (CMDF), for the incorporation of active materials within 3D-printed structures is presented. It is based on passing a filament through a solution in which the active material is dissolved together with the polymer from which the filament is made. This enables the fabrication of a variety of functional 3D-printed objects by fused deposition modeling (FDM) using commercial filaments without post-treatment processes. This generic approach has been demonstrated in objects using three different types of materials, Rhodamine B, ZnO nanoparticles (NPs), and Ciprofloxacin (Cip). The functionality of these objects is demonstrated through strong antibacterial activity in ZnO NPs and the controlled release of the antibiotic Cip. CMDF does not alter the mechanical properties of FDM-printed structures, can be applied with any type of FDM printer, and is, therefore, expected to have applications in a wide variety of fields.
Pavel Savchenko, Din Zelikovich, Hadassah Elgavi Sinai, Roi Baer, and Daniel Mandler
American Chemical Society (ACS)
Engineered metallic nanoparticles, which are found in numerous applications, are usually stabilized by organic ligands influencing their interfacial properties. We found that the ligands affect tremendously the electrochemical peak oxidation potentials of the nanoparticles. In this work, identical gold nanoparticles were ligand-exchanged and carefully analyzed to enable a precise and highly reproducible comparison. The peak potential difference between gold nanoparticles stabilized by various ligands, such as 2- and 4-mercaptobenzoic acid, can be as high as 71 mV, which is substantial in energetic terms. A detailed study supported by density functional theory (DFT) calculations aimed to determine the source of this interesting effect. The DFT simulations of the ligand adsorption modes on Au surfaces were used to calculate the redox potentials through the thermodynamic cycle method. The DFT results of the peak potential shift were in good agreement with the experimental results for a few ligands, but showed some discrepancy, which was attributed to kinetic effects. The kinetic rate constant of the oxidation of Au nanoparticles stabilized by 4-mercaptobenzoic acid was found to be twice as large as that of the Au nanoparticles stabilized by citrate, as calculated from Laviron’s theory and the Tafel equation. Finally, these findings could be applied to some novel applications such as determining the distribution of nanoparticle population in a dispersion as well as monitoring the ligand exchange between nanoparticles.
Hila Sagi-Cohen, Pavel Savchenko, and Daniel Mandler
Elsevier BV
Elad Ballas, Amey Nimkar, Gil Bergman, Ran Elazari, Racheli Wakshlak, Daniel Sharon, Mikhael D Levi, Dan Thomas Major, Daniel Mandler, Netanel Shpigel,et al.
Elsevier BV
Gil Bergman, Netta Bruchiel-Spanier, Omer Bluman, Noam Levi, Sara Harpaz, Fyodor Malchick, Langyuan Wu, Masato Sonoo, Munseok S. Chae, Guoxiu Wang,et al.
Royal Society of Chemistry (RSC)
Achieving reversible zinc deposition/stripping necessitates careful optimization of the electrolyte composition. This study offers detailed insights into the impact of various anionic species (chloride, sulfate, perchlorate) on this process.
Juanjuan Song, Chao Zhang, Peng Zhao, Boyuan Liu, Cai Liu, Ping Du, Daniel Mandler, Wu Lei, Qiubo Guo, and Qingli Hao
Elsevier BV
Xue Wen, Xiangcheng Zhang, Meng Wang, Congli Yuan, Junyu Lang, Xue Li, Hao Wei, Daniel Mandler, and Mingce Long
Elsevier BV
Daniel Mandler and Antonio Doménech-Carbó
Springer Science and Business Media LLC
Juanjuan Song, Can Su, Chao Zhang, Ke Wu, Zongdeng Wu, Xifeng Xia, Wu Lei, Daniel Mandler, Ping Du, and Qingli Hao
Elsevier BV
Guy Naim, Netta Bruchiel-Spanier, Shelly Betsis, Noam Eliaz, and Daniel Mandler
MDPI AG
Digital light processing (DLP) is a vat photopolymerization 3D printing technique with increasingly broad application prospects, particularly in personalized medicine, such as the creation of medical devices. Different resins and printing parameters affect the functionality of these devices. One of the many problems that biomedical implants encounter is inflammation and bacteria growth. For this reason, many studies turn to the addition of antibacterial agents to either the bulk material or as a coating. Zinc oxide nanoparticles (ZnO NPs) have shown desirable properties, including antibacterial activity with negligible toxicity to the human body, allowing their use in a wide range of applications. In this project, we developed a resin of poly(ethylene glycol) diacrylate (PEGDA), a cross-linker known for its excellent mechanical properties and high biocompatibility in a 4:1 weight ratio of monomers to water. The material’s mechanical properties (Young’s modulus, maximum elongation, and ultimate tensile strength) were found similar to those of human cartilage. Furthermore, the ZnO NPs embedding matrix showed strong antibacterial activity against Escherichia coli (E. coli) and Staphylococcus aureus (S.A.). As the ZnO NPs ratio was changed, only a minor effect on the mechanical properties of the material was observed, whereas strong antibacterial properties against both bacteria were achieved in the case of 1.5 wt.% NPs.
Din Zelikovich, Linoy Dery, Hila Sagi-Cohen, and Daniel Mandler
Royal Society of Chemistry (RSC)
The combination of molecular imprinting approaches and nanomaterials has recently emerged in new approaches for the imprinting of nanomaterials. This review summarizes the latest studies and the potential implications and applications of this field.
Fanxu Meng, Qian Wu, Kamal Elouarzaki, Songzhu Luo, Yuanmiao Sun, Chencheng Dai, Shibo Xi, Yubo Chen, Xinlong Lin, Mingliang Fang,et al.
American Association for the Advancement of Science (AAAS)
Developing technologies based on the concept of methanol electrochemical refinery (e-refinery) is promising for carbon-neutral chemical manufacturing. However, a lack of mechanism understanding and material properties that control the methanol e-refinery catalytic performances hinders the discovery of efficient catalysts. Here, using 18 O isotope–labeled catalysts, we find that the oxygen atoms in formate generated during the methanol e-refinery reaction can originate from the catalysts’ lattice oxygen and the O-2p-band center levels can serve as an effective descriptor to predict the catalytic performance of the catalysts, namely, the formate production rates and Faradaic efficiencies. Moreover, the identified descriptor is consolidated by additional catalysts and theoretical mechanisms from density functional theory. This work provides direct experimental evidence of lattice oxygen participation and offers an efficient design principle for the methanol e-refinery reaction to formate, which may open up new research directions in understanding and designing electrified conversions of small molecules.
Fyodor Malchik, Kairgali Maldybayev, Tatyana Kan, Saule Kokhmetova, Munseok S. Chae, Andrey Kurbatov, Alina Galeyeva, Olzhas Kaupbay, Amey Nimkar, Gil Bergman,et al.
Elsevier BV
Din Zelikovich, Pavel Savchenko, and Daniel Mandler
American Chemical Society (ACS)
The development of highly selective probes for nanoparticles is required due to their nanotoxicity. The latter strongly depends on the size, structure, and interfacial properties of the nanoparticles. Here, we demonstrate that a simple approach for the selective detection of Au nanoparticles that differ in their capping agent shows very high promise. Specifically, gold nanoparticles stabilized by each of the three different isomers of mercaptobenzoic acid (MBA) were imprinted in a soft matrix by adsorption of the nanoparticles, followed by filling the non-occupied areas through electropolyermization of an aryl diazonium salt (ADS). Nanocavities bearing the shape of the Au nanoparticles were formed upon the electrochemical dissolution of the nanoparticles, which were used for the reuptake of the Au nanoparticles stabilized by the different isomers. High reuptake selectivity was found where the originally imprinted nanoparticles were recognized better than the Au nanoparticles stabilized by other MBA isomers. Furthermore, an imprinted matrix by nanoparticles stabilized by 4-MBA could also recognize nanoparticles stabilized by 2-MBA, and vice versa. A detailed study using Raman spectroscopy and electrochemistry disclosed the organization of the capping isomers on the nanoparticles as well as the specific nanoparticle-matrix interactions that were responsible for the high reuptake selectivity observed. Specifically, the Raman band at ca. 910 cm–1 for all AuNP–matrix systems implies the formation of a carboxylic acid dimer and thus the interaction of the ligands with the matrix. These results have implications for the selective and simple sensing of engineered nanoparticles.
Nabasmita Maity, Netta Bruchiel-Spanier, Orna Sharabani-Yosef, Daniel Mandler, and Noam Eliaz
Royal Society of Chemistry (RSC)
A novel photo-crosslinkable, biocompatible, fouling resistant, UV-assisted coating composed of ZnO nanoparticles in methacrylate end-terminal PLA-block-PEG copolymers for combatting implant-associated infections.
Linoy Dery, Bogdan Sava, and Daniel Mandler
Wiley
Gil Bergman, Elad Ballas, Qiang Gao, Amey Nimkar, Bar Gavriel, Mikhael D. Levi, Daniel Sharon, Fyodor Malchik, Xuehang Wang, Netanel Shpigel,et al.
Wiley
The discovery of the Ti3C2Tx compounds (MXenes) a decade ago opened new research directions and valuable opportunities for high‐rate energy storage applications. The unique ability of the MXenes to host various mono‐ and multivalent cations and their high stability in different electrolyte environments including aqueous, organic, and ionic liquid solutions, promoted the rapid development of advanced MXene‐based electrodes for a large variety of applications. Unlike the vast majority of typical intercalation compounds, the electrochemical performance of MXene electrodes is strongly influenced by the presence of co‐inserted solvent molecules, which cannot be detected by conventional current/potential electrochemical measurements. Furthermore, the electrochemical insertion of ions into MXene interspaces results in strong coupling with the intercalation‐induced structural, dimensional, and viscoelastic changes in the polarized MXene electrodes. To shed light on the charging mechanisms of MXene systems and their associated phenomena, the use of a large variety of real‐time monitoring techniques has been proposed in recent years. This review summarizes the most essential findings related to the charging mechanism of Ti3C2Tx electrodes and their potential induced structural and mechanical phenomena obtained by in situ investigations.
Xue Wen, Jie Miao, Daniel Mandler, and Mingce Long
Elsevier BV
Linoy Dery, Shahar Dery, Elad Gross, and Daniel Mandler
American Chemical Society (ACS)
Studying nanoparticle (NP)–electrode interactions in single nanoparticle collision events is critical to understanding dynamic processes such as nanoparticle motion, adsorption, oxidation, and catalytic activity, which are abundant on electrode surfaces. Herein, NP–electrode electrostatic interactions are studied by tracking the oxidation of AgNPs at Au microelectrodes functionalized with charged self-assembled monolayers (SAMs). Tuning the charge of short alkanethiol-based monolayers and selecting AgNPs that can be partially or fully oxidized upon impact enabled probing the influence of attractive and repulsive NP–electrode electrostatic interactions on collision frequency, electron transfer, and nanoparticle sizing. We find that repulsive electrostatic interactions lead to a significant decrease in collision frequency and erroneous nanoparticle sizing. In stark difference, attractive electrostatic interactions dramatically increase the collision frequency and extend the sizing capability to larger nanoparticle sizes. Thus, these findings demonstrate how NP–monolayer interactions can be studied and manipulated by combining nanoimpact electrochemistry and functionalized SAMs.
Ziyu Chen, Juanjuan Song, Bin Zhang, Zongdeng Wu, Daniel Mandler, Wu Lei, and Qingli Hao
Springer Science and Business Media LLC
Zengyu Zhang, Yona Chen, Daniel Mandler, and Moshe Shenker
Informa UK Limited
ABSTRACT Phosphorus (P) nanoparticles were hypothesized to exhibit greater mobility in soils than water-soluble P (WSP) and were therefore proposed to be used as a P fertilizer. Unsaturated transport is the main pathway from the application site to plant roots. Though its importance to fertilizer efficacy, quantitative evaluation of unsaturated transport of P nanoparticles has been overlooked to date. Mobility of spherical nano-hydroxyapatite particles coated with polyacrylic acid (PAA-nHAP) suspension and WSP (a mixture of KH2PO4 and K2HPO4) was evaluated in breakthrough column experiments under unsaturated states using three soils: alkaline sand (sandy-alk), acidic sandy clay loam (sandy-ac) and clayey soils. Next, P retention was determined by total P extraction layer-by-layer from the disassembled soil columns. In all soils, PAA-nHAP exhibited faster transport compared to WSP. In the sandy-alk soil, earlier breakthrough but lower plateau of the final relative P concentration of PAA-nHAP (64.0% vs. 100% of the input P concentration) and consistent low P retention with depth after washing with 10 mM KBr solution for the two sources were observed. In the other two soils, PAA-nHAP displayed greater retention near the inlet and decreased retention with depth. In the sandy-ac soil, no WSP and low final relative concentrations of PAA-nHAP (11.6%) were transported through the soil column. The retention of PAA-nHAP was much lower than that of WSP with depth. In the clayey soil, the breakthrough (relative P concentration >1%) occurred earlier (~35 pore volumes vs. ~45 pore volumes) and the eluted P concentration increased more rapidly (~2.6 times) for PAA-nHAP compared to WSP. The difference between the two sources mainly occurred at the soil surface with higher retention of WSP. Soil properties affected the P retention capacity of the two P sources, but for all soils, P mobility was increased by changing from the common soluble fertilizers to nanoparticles. Adsorption and size exclusion effect are suggested as the major factors affecting nHAP mobility. We suggest that the nHAP transport can be improved by modifying its coating with more negative zeta-potential to decrease coagulation and adopting drip flows with short hydraulic retention time. The design of the nanoparticles needs to take into account soil properties.
Amey Nimkar, Munseok S. Chae, Shianlin Wee, Gil Bergman, Bar Gavriel, Meital Turgeman, Fyodor Malchik, Mikhael D. Levi, Daniel Sharon, Maria R. Lukatskaya,et al.
American Chemical Society (ACS)
Atanu Roy, Theresa Schoetz, Leo W. Gordon, Hung‐Ju Yen, Qingli Hao, and Daniel Mandler
Wiley
Abstract Hybrid electric storage systems that combine capacitive and faradaic materials need to be well designed to benefit from the advantages of batteries and supercapacitors. The ultimate capacitive material is graphite (GR), yet high capacitance is usually not achieved due to restacking of its sheets. Therefore, an appealing approach to achieve high power and energy systems is to embed a faradaic 2D material in between the graphite sheets. Here, a simple one‐step approach was developed, whereby a faradaic material [layered double hydroxide (LDH)] was electrochemically formed inside electrochemically exfoliated graphite. Specifically, GR was exfoliated under negative potentials by CoII and, in the presence of MnII, formed GR‐CoMn‐LDH, which exhibited a high areal capacitance and energy density. The high areal capacitance was attributed to the exfoliation of the graphite at very negative potentials to form a 3D foam‐like structure driven by hydrogen evolution as well as the deposition of CoMn‐LDH due to hydroxide ion generation inside the GR sheets. The ratio between the CoII and MnII in the CoMn‐LDH was optimized and analyzed, and the electrochemical performance was studied. Analysis of a cross‐section of the GR‐CoMn‐LDH confirmed the deposition of LDH inside the GR layers. The areal capacitance of the electrode was 186 mF cm−2 at a scan rate of 2 mV s−1. Finally, an asymmetric supercapacitor was assembled with GR‐CoMn‐LDH and exfoliated graphite as the positive and negative electrodes, respectively, yielding an energy density of 96.1 μWh cm−3 and a power density of 5 mW cm−3.
Sujoy Sarkar, Ajith C. Herath, Debdyuti Mukherjee, and Daniel Mandler
Elsevier BV
Netta Bruchiel-Spanier, Shelly Betsis, Guy Naim, and Daniel Mandler
Springer Science and Business Media LLC