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article

Continuous and reactive nanocrystallization: New concepts and processes for dual-use advances

Denis Spitzer, Vincent Pichot, Florent Pessina, Fabien Schnell, more

Comptes Rendus Chimie > 2017 > 20 > 4 > 339-345

The nanocrystallization of organic pure and composite materials in amounts compatible with industrial demands opens an important challenge as such compounds are of high interest in the fields of pharmacy and defense. We demonstrate the versatility of the Spray Flash Evaporation (SFE) process which is a continuous technique and will establish a wider sphere of hierarchical nanocomposite structures...

article

Phase change material based cold thermal energy storage: Materials, techniques and applications – A review

C. Veerakumar, A. Sreekumar

International Journal of Refrigeration > 2016 > 67 > C > 271-289

This paper gives a comprehensive review on recent developments and the previous research studies on cold thermal energy storage using phase change materials (PCM). Such commercially available PCMs having the potential to be used as material for cold energy storage are categorised and listed with their melting point and latent heat of fusion. Also techniques for improving the thermo-physical properties...

article

Insulating oxide surfaces and nanostructures

Jacek Goniakowski, Claudine Noguera

Comptes Rendus Physique > 2016 > 17 > 3-4 > 471-480

This contribution describes some peculiarities of the science of oxide surfaces and nanostructures and proposes a simple conceptual scheme to understand their electronic structure, in the spirit of Jacques Friedel's work. Major results on the effects of non-stoichiometry and polarity are presented, for both semi-infinite surfaces and ultra-thin films, and promising lines of research for the near future...

article

High density decoration of noble metal nanoparticles on polydopamine-functionalized molybdenum disulphide

Muhammad Asif Hussain, MinHo Yang, Tae Jae Lee, Jung Won Kim, more

Journal of Colloid And Interface Science > 2015 > 451 > Complete > 216-220

Here, we report a highly stable colloidal suspension of nanoparticles (i.e., Pt and Au)-deposited MoS ₂ sheets, in which polydopamine (PD) serves as surface functional groups. The adoption of polydopamine coating onto the MoS ₂ surface enables homogeneous deposition of nanoparticles in an aqueous solution. As-synthesized nanohybrids are thoroughly characterized by transmission electron...

article

Nano oxalates of Fe, Co, Ni: Burning rate modifiers for composite solid propellants

Supriya Singh, Pratibha Srivastava, Gurdip Singh, S. Singh, more

Journal of Industrial and Engineering Chemistry > 2015 > 27 > Complete > 88-95

We highlight here current research focused on the catalytic activity of nano oxalates of Fe, Co and Ni synthesized by colloidal precipitation method. The catalytic activity of these nano oxalates was examined for the thermal decomposition of ammonium perchlorate (AP) and composite solid propellants (CSPs) using thermogravimetry (TG), TG coupled with differential scanning calorimetry (TG–DSC) and ignition...

article

Gas nanobubbles and aqueous nanostructures: the crucial role of dynamization

Jean-Louis Demangeat, J.L. Demangeat

Homeopathy > 2015 > 104 > 2 > 101-115

Nanobubbles (NBs) have been a subject of intensive research over the past decade. Their peculiar characteristics, including extremely low buoyancy, longevity, enhanced solubility of oxygen in water, zeta potentials and burst during collapse, have led to many applications in the industrial, biological and medical fields. NBs may form spontaneously from dissolved gas but the process is greatly enhanced...

article

Effect of Hg2+doping and of the annealing temperature on the nanostructural properties of TiO2 thin films obtained by sol–gel method

Fouzia Abbas, Rabah Bensaha, Hassimi Taroré

Comptes rendus - Chimie > 2014 > 17 > 12 > 1176-1183

This work is a study of Hg ²⁺ -doped TiO ₂ thin films deposited on silicon substrates prepared by sol–gel method and treated at temperatures ranging between 600 to 1000°C for 2h. The structural and optical properties of thin films have been studied using different techniques. We analyzed the vibrations of the chemical bands by Fourier transform infrared (FTIR) spectroscopy and the...

article

Mechanochemical decomposition of Ag and Ni oxalates

Francesco Delogu, F. Delogu

Materials Chemistry and Physics > 2014 > 147 > 3 > 629-635

This study concerns the mechanochemical reactivity of Ag and Ni oxalates. Mixtures of different chemical composition were prepared either by mixing the individual oxalates, or by co-precipitating them from a solution. The obtained powders were processed by ball drop in the presence of an aqueous solution containing polyvinylpyrrolidone. When pure, or in simple mixture, Ag and Ni oxalates decompose...

article

Morphology of Zn/Al layered double hydroxide nanosheets grown onto aluminum thin films

D. Scarpellini, C. Falconi, P. Gaudio, A. Mattoccia, more

Microelectronic Engineering > 2014 > 126 > Complete > 129-133

Layered double hydroxide (LDH) nanosheets have been fabricated by a one-step, room-temperature, hydrothermal process on sputtered-aluminum thin substrates, in which the metal substrate acts as both reactant and support. The morphology, dimensions and composition of the obtained nanostructures have been characterized as a function of the substrate thickness by scanning electron microscopy (SEM), X-ray...

article

Seeing and measuring in 3D with electrons

Sara Bals, Bart Goris, Thomas Altantzis, Hamed Heidari, more

Comptes Rendus Physique > 2014 > 15 > 2-3 > 140-150

Modern TEM enables the investigation of nanostructures at the atomic scale. However, TEM images are only two-dimensional (2D) projections of a three-dimensional (3D) object. Electron tomography can overcome this limitation. The technique is increasingly focused towards quantitative measurements and reaching atomic resolution in 3D has been the ultimate goal for many years. Therefore, one needs to...

article

The alkali and alkaline earth metal doped ZnO nanotubes: DFT studies

Ali Ahmadi Peyghan, Maziar Noei, A.A. Peyghan, M. Noei

Physica B: Physics of Condensed Matter > 2014 > 432 > Complete > 105-110

Doping of several alkali and alkaline earth metals into sidewall of an armchair ZnO nanotube has been investigated by employing the density functional theory in terms of energetic, geometric, and electronic properties. It has been found that doping processes of the alkali and alkaline metals are endothermic and exothermic, respectively. Based on the results, contrary to the alkaline metal doping,...

article

Synthesis of four-fold shape CeO2 dendrites by a reduction route

DongEn Zhang, Feng Li, ShanZhong Li, XiaoBo Zhang, more

Materials Chemistry and Physics > 2013 > 142 > 2-3 > 496-501

Highly uniform four-fold shape CeO ₂ dendrites were successfully prepared in large quantities through a thermal decomposition of precursor approach. The precursor with an average size of 10 μm was prepared from the reaction of Ce(NH ₄ ) ₂ (NO ₃ ) ₆ with CO(NH ₂ ) ₂ at 160 °C in a water–N ₂ H ₄ complex solution. The influence of...

article

Skin dominance of the dielectric–electronic–phononic–photonic attribute of nanoscaled silicon

Likun Pan, Shiqing Xu, Xinjuan Liu, Wei Qin, more

Surface Science Reports > 2013 > 68 > 3-4 > 418-445

Nanoscaled or porous silicon (p-Si) with and without surface passivation exhibits unusually tunable properties that its parent bulk does never show. Such property tunability amplifies the applicability of Si in the concurrent and upcoming technologies. However, consistent understanding of the fundamental nature of nanoscaled Si remains a high challenge. This article aims to address the recent progress...

article

Modification of the surfaces of medical devices to prevent microbial adhesion and biofilm formation

C. Desrousseaux, V. Sautou, S. Descamps, O. Traoré, more

Journal of Hospital Infection > 2013 > 85 > 2 > 87-93

Background: The development of devices with surfaces that have an effect against microbial adhesion or viability is a promising approach to the prevention of device-related infections. Aim: To review the strategies used to design devices with surfaces able to limit microbial adhesion and/or growth. Methods: A PubMed search of the published literature. Findings: One strategy is to design medical devices...

article

Role of nanoparticle dispersion and filler-matrix interface on the matrix dominated failure of rigid C60-PE nanocomposites: A molecular dynamics simulation study

Sheikh F. Ferdous, Md. Farzad Sarker, Ashfaq Adnan, S.F. Ferdous, more

Polymer > 2013 > 54 > 10 > 2565-2576

In this study, using classical molecular dynamics simulation approach, we have investigated the effects of nanoparticle dispersion and the intensity of filler and matrix interface attractions on the mechanical properties of buckyball reinforced polyethylene nanocomposites. The dispersion state of nanoparticles was studied by modeling nanoparticles either in a homogenously distributed form or in a...

article

Effect of pH on Formation of Nickel Nanostructures through Chemical Reduction Method

N.R. Nik Roselina, A. Azizan, Koay Mei Hyie, Aidah Jumahat, more

Procedia Engineering > 2013 > 68 > Complete > 43-48

The synthesis of nickel (Ni) nanostructures through chemical reduction method using hydrazine (N ₂ H ₄ .6H ₂ O) as the reducing agent and ethylene glycol (EG) as the surfactant is reported. The synthesis was conducted in 1 hour of heating at temperature of 60°C. Sodium hydroxide (NaOH) was used to control the pH of solutions. Scanning Electron Microscopy (SEM) and Tranmission...

article

Self-assembling polysaccharide systems based on cyclodextrin complexation: Synthesis, properties and potential applications in the biomaterials field

Rachel Auzély-Velty

Comptes rendus - Chimie > 2011 > 14 > 2-3 > 167-177

The supramolecular assemblies based on polysaccharides modified by cyclodextrins (CDs) and/or hydrophobic guest molecules have inspired interesting developments in the biomedical, pharmaceutical and cosmetic fields. This review will update the recent progress in the design, synthesis and study of such supramolecular structures. Preliminary studies demonstrated that such systems, based on the physical...

article

Evaluation of sorted semi-conducting carbon nanotube films for gas sensing applications

Yann Battie, Olivier Ducloux, Philippe Thobois, Yannick Coffinier, more

Comptes rendus - Physique > 2010 > 11 > 5-6 > 397-404

This work focuses on the elaboration of sorted semi-conducting single walled carbon nanotube films (SC-SWCNT films), and the evaluation of a gas microsensor based on these films. First, we show that semi-conducting carbon nanotubes could be sorted from solutions containing both metallic and semi-conducting nanotubes by ultracentrifugation in a density gradient. SC-SWCNT films were then obtained by...

article

Modélisation géométrique des structures granulaires

Patrick Laug, Houman Borouchaki, Azeddine Benabbou, Jian Lu

Comptes rendus - Mecanique > 2008 > 336 > 6 > 506-511

Une structure granulaire est un assemblage de grains dont les tailles sont caractérisées par une distribution donnée. Un échantillon de ce type de structure est souvent modélisé par un rectangle rempli de disques en deux dimensions ou un parallélépipède contenant des boules en trois dimensions. La modélisation géométrique d'une telle structure consiste donc à déterminer une répartition « dense » de...

article

Soft X-ray resonant magnetic scattering of magnetic nanostructures

Gerrit van der Laan

Comptes rendus - Physique > 2008 > 9 > 5-6 > 570-584

Soft X-ray resonant magnetic scattering offers a unique element-, site- and valence-specific probe to study magnetic structures on the nanoscopic length scale. This new technique, which combines X-ray scattering with X-ray magnetic circular and linear dichroism, is ideally suited to investigate magnetic superlattices and magnetic domain structures. The theoretical analysis of the polarization dependence...

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Search results

Continuous and reactive nanocrystallization: New concepts and processes for dual-use advances

Phase change material based cold thermal energy storage: Materials, techniques and applications – A review

Insulating oxide surfaces and nanostructures

High density decoration of noble metal nanoparticles on polydopamine-functionalized molybdenum disulphide

Nano oxalates of Fe, Co, Ni: Burning rate modifiers for composite solid propellants

Gas nanobubbles and aqueous nanostructures: the crucial role of dynamization

Effect of Hg2+doping and of the annealing temperature on the nanostructural properties of TiO2 thin films obtained by sol–gel method

Mechanochemical decomposition of Ag and Ni oxalates

Morphology of Zn/Al layered double hydroxide nanosheets grown onto aluminum thin films

Seeing and measuring in 3D with electrons

The alkali and alkaline earth metal doped ZnO nanotubes: DFT studies

Synthesis of four-fold shape CeO2 dendrites by a reduction route

Skin dominance of the dielectric–electronic–phononic–photonic attribute of nanoscaled silicon

Modification of the surfaces of medical devices to prevent microbial adhesion and biofilm formation

Role of nanoparticle dispersion and filler-matrix interface on the matrix dominated failure of rigid C60-PE nanocomposites: A molecular dynamics simulation study

Effect of pH on Formation of Nickel Nanostructures through Chemical Reduction Method

Self-assembling polysaccharide systems based on cyclodextrin complexation: Synthesis, properties and potential applications in the biomaterials field

Evaluation of sorted semi-conducting carbon nanotube films for gas sensing applications

Modélisation géométrique des structures granulaires

Soft X-ray resonant magnetic scattering of magnetic nanostructures

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