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Size-dependent antibacterial activity of copper nanoparticles against Xanthomonas oryzae pv. oryzae – A synthetic and mechanistic approach
Publication date: September 2019Source: Colloid and Interface Science Communications, Volume 32Author(s): Tapodhara Datta Majumdar, Mukesh Singh, Mala Thapa, Moumita Dutta, Abhishek Mukherjee, Chandan Kumar GhoshAbstractXanthomonas oryzae pv. oryzae (X. oryzae), causing devastating bacterial leaf blight (BLB) disease in rice, is fast developing resistance against many available antibiotics, warranting an urgent need to develop an alternative control strategy. In this manuscript, we report copper nanoparticles (CuNPs) as an effective antibacterial agent against X. oryzae. We synthesized four different sized CuNPs in a narro...
Source: Colloids and Interface Science Communications - July 24, 2019 Category: Nanotechnology Source Type: research

Green synthesis of silver nanoparticles using Combretum erythrophyllum leaves and its antibacterial activities
Publication date: July 2019Source: Colloid and Interface Science Communications, Volume 31Author(s): Olufunto T. Jemilugba, El Hadji Mamour Sakho, Sundararajan Parani, Vuyo Mavumengwana, Oluwatobi S. OluwafemiAbstractA simple, green, cost effective and environmentally benign method for the synthesis of silver nanoparticles (Ag-NPs) using aqueous extract of Combretum erythrophyllum plant leaves as both the reducing and capping agents is herein reported for the first time. The as-prepared Ag-NPs were characterised using Ultraviolet–Visible (UV–Vis) absorption spectroscopy, transmission electron microscopy (TEM), Fourier ...
Source: Colloids and Interface Science Communications - July 12, 2019 Category: Nanotechnology Source Type: research

Aggregation of semifluorinated alkanes in cyclic organic solvents: A SAXS study
Publication date: July 2019Source: Colloid and Interface Science Communications, Volume 31Author(s): Benoît Gouze, Thibaud Nardin, Olivier Diat, Julien CambedouzouAbstractSemifluorinated alkanes (SFA) are diblock molecules able to self-assemble in various organic media due to their fluorophilic/fluorophobic interactions. Such mixtures accordingly represent a model system for the further elaboration of soft-templated inorganic materials in totally anhydrous media. The aggregation behavior of four SFA species has been studied in two different organic and cyclic solvents in function of temperature by small angle X-ray scatte...
Source: Colloids and Interface Science Communications - July 3, 2019 Category: Nanotechnology Source Type: research

Synthesis and properties of alumina-hydroxyapatite composites from natural phosphate for phenol removal from water
Publication date: July 2019Source: Colloid and Interface Science Communications, Volume 31Author(s): K. Bouiahya, I. Es-saidi, C. El Bekkali, A. Laghzizil, D. Robert, J.M. Nunzi, A. SaoiabiAbstractPhenol is very abundant in the aquatic environment and therefore requires an effective treatment using porous and low-cost adsorbents. Alumina-hydroxyapatite composites were prepared from natural phosphate ore in the presence of Al3+ ions via a wet-chemical method. Porous composites were characterized and the Al-surface modification was produced by facile and inexpensive route to uptake adjacent toxic species. Supplementary activ...
Source: Colloids and Interface Science Communications - July 3, 2019 Category: Nanotechnology Source Type: research

Mild synthesis of single-nanosized plasmonic copper nanoparticles and their catalytic reduction of methylene blue
In this study, we report a mild synthesis of sub-10 nm Cu nanoparticles (NPs) in ethylene glycol (EG) at room temperature using l-ascorbic acid (AA) as the reducing agent in the presence of 1-amino-2-propanol (AMIP). To the best of our knowledge, this work is the first report of the room-temperature synthesis of sub-10 nm Cu NPs using a nontoxic reducing agent. The as-prepared colloidal suspension of Cu NPs exhibited surface plasmon resonance absorption at 515 nm. Transmission electron microscopy observations revealed well-dispersed spherical Cu NPs with an average particle size of 4.1 ± 0.8 nm. The use of AMI...
Source: Colloids and Interface Science Communications - June 15, 2019 Category: Nanotechnology Source Type: research

Boundary lubrication properties and contact mechanism of carbon/MoS2 based nanolubricants under steel/steel contact
Publication date: July 2019Source: Colloid and Interface Science Communications, Volume 31Author(s): Ram Krishna Upadhyay, Arvind KumarAbstractLubrication mechanism of some carbon-based nanoparticles is unresolved and needs proper attention. In this work, friction and wear properties of carbon/MoS2 solid lubricants are tested in the boundary lubrication regime and further compared with oil-based binary and ternary nanolubricants. Results show that MWCNT and fullerene have high values of friction coefficient and wear rate in a dry medium. However, in lubricated medium with fomblin oil, they comply with the boundary lubricat...
Source: Colloids and Interface Science Communications - May 17, 2019 Category: Nanotechnology Source Type: research

Modeling of a charged dielectric interface: Comparison of the continuum and discrete lattice representations of surface charges
Publication date: May 2019Source: Colloid and Interface Science Communications, Volume 30Author(s): Jiaxing Yuan, Yanwei WangAbstractTwo main approaches in particle-based simulations for modeling a charged surface are using explicit, discrete charges and continuum, uniform charges. It is well-known that these two approaches could lead to substantially distinct ionic distributions, whereas a systematic exploration of the origin is still absent. In this short communication, we calculate the electrostatic force of a single point charge above a planar substrate characterized by a surface charge density and dielectric mismatch ...
Source: Colloids and Interface Science Communications - April 29, 2019 Category: Nanotechnology Source Type: research

Design of nanoporous titania-supported methylene blue molecules for efficient singlet oxygen generation under red light exposure
Publication date: May 2019Source: Colloid and Interface Science Communications, Volume 30Author(s): Iori Yamada, Ryota Ikeda, Shinya Nagata, Masaya Kakuta, Motohiro TagayaAbstractThe methylene blue (MB) adsorption states on the titania nanoparticles (NPs) prepared by two surfactant removal processes were investigated to demonstrate the singlet oxygen generation efficiency. The NPs with the BET surface areas of 250–350 m2/g exhibited the spherical particle sizes of 100–150 nm, indicating the nanoporous structures. The MB molecular states adsorbed on the NPs prepared by solvent extraction method (WT) were attributed ...
Source: Colloids and Interface Science Communications - April 29, 2019 Category: Nanotechnology Source Type: research

Adsorption Mechanisms of Psychoactive Drugs onto Montmorillonite
Publication date: May 2019Source: Colloid and Interface Science Communications, Volume 30Author(s): Thomas Thiebault, Mohammed BoussafirAbstractThe adsorption of psychoactive drugs (PADs) onto sodium-exchanged montmorillonite (Na—Mt) was investigated under two pH conditions. At pH = 2.5, the adsorption was performed through cation exchange and the three PADs were intercalated within the Na—Mt layers. However, the adsorption capacity was lower than the theoretical cation exchange capacity of Na—Mt due to the impact of the acidic conditions on the adsorbent. At pH = 7.5, only Codeine was protonated and its adso...
Source: Colloids and Interface Science Communications - April 26, 2019 Category: Nanotechnology Source Type: research

Immobilization of 2,2′-bipyridine-5,5′-dicarboxylic acid in layered octacalcium phosphate
Publication date: May 2019Source: Colloid and Interface Science Communications, Volume 30Author(s): Iori Yamada, Motohiro TagayaAbstractImmobilization of 2,2′-bipyridine-5,5′-dicarboxylic acid (Bpdc) into layered octacalcium phosphate was investigated in the hydrolysis process of α-tricalcium phosphate. 100 interlayer distance altered from 1.9 to 2.5–2.7 nm by the immobilization, suggesting the novel inorganic/organic nanohybrids. The nanohybrids exhibited the blue-shifted photoluminescence peaks with the higher internal quantum efficiency as compared with the case in the Bpdc alone.Graphical abstract (Source: Col...
Source: Colloids and Interface Science Communications - April 19, 2019 Category: Nanotechnology Source Type: research

Interfacial rheological behaviour of lentil protein isolate-fenugreek gum complex
Publication date: May 2019Source: Colloid and Interface Science Communications, Volume 30Author(s): Pravin Vasant Gadkari, Natalie Longmore, Martin Reaney, Supratim GhoshAbstractThe interfacial adsorption and interfacial shear viscoelasticity of lentil protein isolate (LPI) and fenugreek gum (FG) complexes against canola oil were determined at pH 2 and 7 to understand their effectiveness as emulsifiers. The interfacial elastic moduli of LPI-FG complexes were stronger at pH 2 compared to pH 7. In contrast, the biopolymer interface at pH 7 was able to withstand higher strain before breaking compared to that at pH 2...
Source: Colloids and Interface Science Communications - April 13, 2019 Category: Nanotechnology Source Type: research

Recent advancements in silica nanoparticles based technologies for removal of dyes from water
Publication date: May 2019Source: Colloid and Interface Science Communications, Volume 30Author(s): Sushilkumar A. Jadhav, Harshada B. Garud, Aravind H. Patil, Gajanan D. Patil, Chetan R. Patil, Tukaram D. Dongale, Pramod S. PatilAbstractSilica and silica based hybrid nanoparticles are investigated with great interest for the removal of dyes from water. The presence of surface silanols which can complex the dyes, ease of grafting of additional functionalities to improve the complexation, the possibility of photocatalyst grafting for dye degradation and good chemical stability are the reasons for the excellent efficiency of...
Source: Colloids and Interface Science Communications - April 13, 2019 Category: Nanotechnology Source Type: research

Cascade sensing of iodide and fluoride by tryptophan derived low molecular weight gelator
Publication date: May 2019Source: Colloid and Interface Science Communications, Volume 30Author(s): Mrittika Mohar, Tanmay DasAbstractAn optical cascade sensor of iodide and fluoride ions based on simple tryptophan derivative containing urea functional group has been designed and synthesized via one-step reaction and characterized by different spectroscopic techniques. The tetrahydrofuran solution of the sensor becomes yellow in the presence of iodide ion and this binary yellow solution shows bright green emission under 366 nm UV irradiation in the presence of fluoride ion. The sensor is one of the very few examples of c...
Source: Colloids and Interface Science Communications - March 29, 2019 Category: Nanotechnology Source Type: research

Development of sulfonate-functionalized hydroxyapatite nanoparticles for cadmium removal from aqueous solutions
Publication date: May 2019Source: Colloid and Interface Science Communications, Volume 30Author(s): Abdeladim Oulguidoum, Habiba Bouyarmane, Abdelaziz Laghzizil, Jean-Michel Nunzi, Ahmed SaoiabiAbstractSulfonate-functionalized hydroxyapatite was successfully synthesized by organo-functionalization using natural phosphate and Benzenedisulfonate molecules. The modified apatites were characterized using multiple techniques, evidencing the effective incorporation of organo-functional groups into the hydroxyapatite matrix. Sulfonated mesoporous hydroxyapatite possesses a large amount of accessible -SO3 acid groups, which may be...
Source: Colloids and Interface Science Communications - March 29, 2019 Category: Nanotechnology Source Type: research

Importance of solvent singularity on the formation of highly uniform hexagonal close packed (HCP) colloidal monolayers during spin coating
Publication date: May 2019Source: Colloid and Interface Science Communications, Volume 30Author(s): P. Noppakuadrittidej, K. Tonsomboon, S. UmmartyotinAbstractHighly uniform hexagonal close packed (HCP) colloidal monolayers are extremely essential for the development of photonic, optical, and biosensing devices. Even though high quality HCP colloidal structures can be obtained with vertical deposition (VD), this traditional method is time-consuming and not scalable. Spin coating (SC) has recently been used as an alternative method due to its high production rate, scalability and versatility. However, a few attentions have ...
Source: Colloids and Interface Science Communications - March 27, 2019 Category: Nanotechnology Source Type: research