Hydrodynamic chromatography for the characterization of inorganic nanoparticles

2021 ◽  
Author(s):  
Marco Roman
Keyword(s):  
Inorganic Nanoparticles ◽  
Hydrodynamic Chromatography

Carbon-chain polymers ‘grafting from’ inorganic nanoparticles

e-Polymers ◽  
2005 ◽  
Vol 5 (1) ◽  
Author(s):  
Peng Liu
Keyword(s):  
Chain Transfer ◽  
Carbon Chain ◽  
Inorganic Nanoparticles ◽  
Chain Transfer Agent ◽  
One Pot ◽  
Chain Polymer ◽  
Grafting From

Abstract‘Grafting from’ methods can achieve higher percentages of grafting than ‘grafting to’ methods in the preparation of carbon-chain polymer grafted inorganic nanoparticles (CCP-INs). ‘Grafting from’ methods - such as one-pot method, macro-monomer, macro chain transfer agent, macro-initiator, and macro-iniferter methods, used for the preparation of CCP-INs in our laboratory in the recent years - are reviewed and the grafting parameters are compared. Characterization of the CCP-INs is also described.

Effect of Inorganic Doping on the Thermoelectric Behavior of Polyaniline Nanocomposites

2020 ◽  
Vol 835 ◽  
pp. 200-207
Author(s):  
Mariamu K. Ali ◽  
Ahmed Abd Moneim
Keyword(s):  
Electrical Conductivity ◽  
Conducting Polymers ◽  
Inorganic Nanoparticles ◽  
Inorganic Materials ◽  
Environmental Stability ◽  
Subsequent Reduction ◽  
Preparation Methods ◽  
Reduced Graphene

Polyaniline (PANI) has been considered for thermoelectric (T.E) applications due to its facile preparation methods, easy doping-dedoping processes and its environmental stability. Like other conducting polymers (CPs), it has low thermal conductivity (usually below 1 Wm-1K-1) which is favorable for T.E applications, however studies have shown that it still suffers from low power factors as a result of low electrical conductivity. For this reason, PANI has been compounded with other materials such as polymers, inorganic nanoparticles and carbon nanoparticles to enhance its electrical conductivity, power factors (PF) and ultimately zT value.This work is focused on the synthesis and characterization of n-type polyaniline nanocomposites doped with reduced graphene oxide (rGO). The rGO was prepared through oxidation of graphite and subsequent reduction and incorporated into polyaniline through in situ polymerization and the resulting nanocomposites were characterized. Addition of rGO resulted in enhancement of the electrical conductivity of polyaniline from 10-3 S/cm to 10-1 S/cm which is two orders of magnitude higher. This contributed to the enhanced PF, an indication that thermoelectric behavior of conducting polymers can be boosted through compounding with inorganic materials.

scholarly journals Graphene Oxide-Based Nanohybrids as Pesticide Biosensors: Latest Developments

2020 ◽  
Author(s):  
Navin Kumar Mogha
Keyword(s):  
Graphene Oxide ◽  
Palladium Nanoparticles ◽  
Materials Science ◽  
High Surface ◽  
High Surface Area ◽  
Inorganic Nanoparticles ◽  
Advanced Materials ◽  
Sustainable Environment ◽  
Gold Silver

Graphene is the most significant two-dimensional nanomaterial with sp2 hybridized carbon atoms in a honeycomb arrangement with an extremely high surface area, excellent electrical properties, high mechanical strength, and advantageous optical properties and is relatively easy to functionalize and mass produce. Various inorganic nanoparticles incorporated with graphene, such as gold, silver, and palladium nanoparticles are brought into sharp focus due to their catalytic, optical, electronic, and quantized charging/discharging properties. Graphene oxide-based nanohybrids are particularly well suited for biosensing applications and catalysis. Consequently, this area of research has grown to represent one of the largest classes within the scope of materials science and is rapidly becoming a key area in nanoscience and nanotechnology offering significant potential in the development of advanced materials in multiple and diverse applications. Here in this present chapter, synthesis, characterization of graphene oxide, and their nanohybrids are discussed thoroughly with their application in the field of pesticide biosensors. This chapter will help in a further understanding of graphene-based nanohybrids as a biosensing platform for their future applications in a sustainable environment.

scholarly journals Synthesis and Gas Transport Properties of Poly(2,6-dimethyl-1,4-phenylene oxide)–Silica Nanocomposite Membranes

Membranes ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 125
Author(s):  
Golnaz Bissadi ◽  
Thiago Melo Santos ◽  
Boguslaw Kruczek
Keyword(s):  
Polymer Solution ◽  
Silica Nanoparticles ◽  
Aqueous Phase ◽  
Continuous Phase ◽  
Inorganic Nanoparticles ◽  
Nanocomposite Membranes ◽  
New Approach ◽  
Phenylene Oxide

The emulsion polymerized mixed matrix (EPMM) method is a new approach to prepare nanocomposite membranes, in which inorganic nanoparticles are synthesized in situ at the interface of a dispersed aqueous phase in a continuous phase of polymer solution. In this paper, we report the synthesis and characterization of poly(2,6-dimethyl-1,4-phenylene oxide) (PPO)-based EPMM membranes, in which silica nanoparticles are synthesized by the polymerization of tetraethylorthosilicate (TEOS) in the presence of two different co-solvents, ethanol and acetone, which are soluble in both the aqueous phase and the polymer solution. The EPPM membranes prepared in the presence of acetone show greater conversions of TEOS and a different structure of the synthesized silica nanoparticles compared to the EPMM membranes prepared in the presence of ethanol. The former membranes are both more permeable and more selective for O2/N2 and CO2/CH4. Both types of EPMM membranes are more permeable than the reference PPO membranes. However, while their O2/N2 selectivity is practically unchanged, their CO2/CH4 selectivity is decreased compared to the reference PPO membranes.

Novel Ceria-Polymer Composites for Reduced Defects during Oxide CMP

2009 ◽  
Vol 1157 ◽  
Author(s):  
Cecil Coutinho ◽  
Subramanya Mudhivarthi ◽  
Ashok Kumar ◽  
Vinay Gupta
Keyword(s):  
Particle Deposition ◽  
Silicon Oxide ◽  
Surface Defects ◽  
Removal Rate ◽  
Inorganic Nanoparticles ◽  
Composite Particles ◽  
Pure Silica ◽  
Atomic Force

AbstractTo meet the stringent requirements of device integration and manufacture, surface defects and mechanical stresses that arise during chemical mechanic planarization (CMP) must be reduced. Towards this end, we have synthesized multiple hybrid and composite particles on micron length scales consisting of siloxane co-polymers functionalized with inorganic nanoparticles. These particles can be easily tailored during synthesis, leading to softer or harder abrasion when desired. Upon using these particles for the planarization of silicon oxide wafers, we obtain smooth surfaces with reduced scratches and minimal particle deposition, which is an improvement from conventional abrasive materials like pure silica, ceria and alumina nanoparticle slurries. Tribological characteristics during polishing were examined using a bench top CMP tester to evaluate the in situ co-efficient of friction. Characterization of the hybrid and composite particles has been done using infrared spectroscopy, dynamic light scattering, and electron microscopy. Surface roughness of the wafers was examined using atomic force and optical microscopy while removal rate measurements were conducted using ellipsometry at multiple angles.

Hydrodynamic chromatography coupled to single-particle ICP-MS for the simultaneous characterization of AgNPs and determination of dissolved Ag in plasma and blood of burn patients

2015 ◽  
Vol 408 (19) ◽  
pp. 5109-5124 ◽  
Author(s):  
Marco Roman ◽  
Chiara Rigo ◽  
Hiram Castillo-Michel ◽  
Ivan Munivrana ◽  
Vincenzo Vindigni ◽  
...  
Keyword(s):  
Single Particle ◽  
Burn Patients ◽  
Hydrodynamic Chromatography ◽  
Icp Ms

scholarly journals Infrared Spectroscopic Characterization of Photoluminescent Polymer Nanocomposites

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Kyle Gipson ◽  
Kathryn Stevens ◽  
Phil Brown ◽  
John Ballato
Keyword(s):  
Infrared Spectroscopy ◽  
Polymer Nanocomposites ◽  
Picolinic Acid ◽  
Spectroscopic Characterization ◽  
Optically Active ◽  
Inorganic Nanoparticles ◽  
Organic Ligands ◽  
Organic System ◽  
X Ray

Organicallycoated inorganic nanoparticles were synthesized to produce photoluminescent nanocomposites based on a polymethyl methacrylate (PMMA) matrix. The nanoparticles comprised organic ligands (acetylsalicylic acid, ASA, and 2-picolinic acid, PA) attached to the lanthanum trifluoride (LaF3) host crystals that were doped with optically active terbium III (Tb3+) and synthesized using solution-based methods. The ligands were employed to functionalize the surface of Tb3+:LaF3nanocrystals to aid in dispersing the nanoparticles. In order to confirm the presence of the constituents within the inorganic-organic system, the nanoparticles were characterized by infrared spectroscopy and energy-dispersive X-ray spectroscopy. Absorption peaks observed from infrared spectroscopy for all the polymer nanocomposites loaded with organic surface treated nanocrystals exhibited peaks that were not present in undoped PMMA but were characteristic of the dopant and the ligand.

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