1: Magnetic Particles: Preparation, Properties and Applications: M. Ozaki. 2: Maghemite (gamma-Fe2O3): A Versatile Magnetic Colloidal Material C.J. Serna, M.P. Morales. 3: Dynamics of Adsorption and Oxidation of Organic Molecules on Illuminated Titanium Dioxide Particles Immersed in Water M.A. Blesa, R.J. Candal, S.A. Bilmes. 4: Colloidal Aggregation in Two-Dimensions A. Moncho-Jorda, F. Martinez-Lopez, M.A. Cabrerizo-Vilchez, R. Hidalgo Alvarez, M. Quesada-PMerez. 5: Kinetics of Particle and Protein Adsorption Z. Adamczyk.

Surface and Colloid Science

(1976). Nuclear Tracks in Solids (Principles and Applications) Nuclear Technology: Vol. 30, No. 1, pp. 91-92.

Nuclear Tracks in Solids (Principles and Applications)

Author(s): Chen, Fanqing; Gerion, Daniele | Abstract: One of the biggest challenges in cell biology is the imaging of living cells. For this purpose, the most commonly used visualization tool is fluorescent markers. However, conventional labels, such as organic fluorescent dyes or green fluorescent proteins (GFP), lack the photostability to allow the tracking of cellular events that happen over minutes to days. In addition, they are either toxic to cells (dyes), or difficult to construct and manipulate (GFP). We report here the use of a new class of fluorescent labels, silanized CdSe/ZnS nanocrystal-peptide conjugates, for imaging the nuclei of living cells. CdSe/ZnS nanocrystals, or so called quantum dots (qdots), are extremely photostable, and have been used extensively in cellular imaging of fixed cells. However, most of the studies about living cells so far have been concerned only with particle entry into the cytoplasm or the localization of receptors on the cell membrane. Specific targeting of qdots to the nucleus of living cells has not been reported in previous studies, due to the lack of a targeting mechanism and proper particle size. Here we demonstrate for the first time the construction of a CdSe/ZnS nanocrystal-peptide conjugate that carries the SV40 large T antigen nuclear localization signal (NLS), and the transfection of the complex into living cells. By a novel adaptation of commonly used cell transfection techniques for qdots, we were able to introduce and retain the NLS-qdots conjugate in living cells for up to a week without detectable negative cellular effects. Moreover, we can visualize the movement of the CdSe/ZnS nanocrystal-peptide conjugates from cytoplasm to the nucleus, and the accumulation of the complex in the cell nucleus, over a long observation time period. This report opens the door for using qdots to visualize long-term biological events that happen in the cell nucleus, and provides a new nontoxic, long-term imaging platform for cell nuclear processes.

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Fluorescent CdSe/ZnS nanocrystal-peptide conjugates for long-term, nontoxic imaging and

2D Black Phosphorus–Based Biomedical Applications

Ammonia gas sensors: A comprehensive review.

Improving the conversion efficiency and reducing cost are the major tasks to make more energy competitive-based photovoltaics and able to replace the traditional fossil energies. In organic/inorganic-based solar cell development, nanotechnology seems to be the most promising branch. Nanostructure materials with large band gap synthesized from III–V and II–VI elements are gaining more attention because of their potential use in emerging energy applications. Nanostructures with different morphologies including nanowires, nanosprings, nanobelts and nanocombs can be prepared. Variations in atomic arrangements to minimize the effect of electrostatic energies produces from different ionic charges on the polar surfaces are the major reason of diversified range of nanostructures. In this book chapter, we will focus on the contribution of different nanomaterials in the advancement of solar cell technology.

Photovoltaic-Based Nanomaterials: Synthesis and Characterization

Nanocomposites have been emerged a major class of materials mainly due to providing multifunctional properties in a single system. Graphene is a 2-dimensional carbon-based material and has applications in many fields due to their extraordinary properties. Polylactic acid (PLA) is a biopolymer with huge scope in the biomedical field and especially in bio-engineering but has limitations due to low crystallization and week thermal and mechanical properties. Recently, Graphene-PLA based nanocomposites are investigated to overcome constraints faced by PLA polymer materials, especially for biomedical engineering. These nanocomposites have improved crystallization of PLA polymers and also enhanced mechanical strength of the polymer required for preparing different artificial organs such as tissues, bones etc. In this book chapter, a brief discussion is made on PLA and graphene, then synthesis methods for graphene composites and their functionalization on the graphene surface. Finally, biomedical applications of Graphene functionalized PLA nanocomposites have been discussed.

Graphene Functionalized PLA Nanocomposites and Their Biomedical Applications

Iron oxide nanoparticles (IONPs) have great importance due to their use in many biomedical applications such as contrast agents in MRI, repairing of tissues, detoxification of biological fluids, cell separation, drug delivery, immunoassay, and magnetic hyperthermia. One of the interesting properties of IONPs is to produce heat in the presence of an applied alternating magnetic field (AMF), the basic principle of magnetic hyperthermia. Here, we seek synthetic reproducibility and to optimize Fe3O4 NPs to use in magnetic hyperthermia applications. We compared the thermal efficiency of Fe3O4 NPs after doping with copper. Using co-precipitation methodology, pure and Cu-doped Fe3O4 NPs were synthesized at five different concentrations (2%, 4%, 5%, 8%, and 10%). X-ray diffraction (XRD) and scanning electron microscopy (SEM) have been used to study the crystal structure and surface morphology of nanomaterials. Fourier-transform infrared (FTIR) spectroscopy, Raman spectroscopy, and UV–visible spectroscopy were used to investigate the functional group, vibrational and optical properties of NPs. The thermal response of doped and undoped Fe3O4 NPs was studied by using high-frequency electromagnet driver for hyperthermia applications (HFEDHA) at 53 kHz frequency and 270 Oe magnetic field strength. To check the effects of suspension medium and variation of NP concentration in the sample on heat response and on specific absorption rate (SAR) values, the hyperthermia studies have been investigated in three biological mediums water, glycerol, and agar at four different NP concentrations 2%, 5%, 7%, and 10%. Our results show that at 2% concentration of copper in Fe3O4 NPs gave better results in all three mediums. However, they showed greater heat response and the highest SAR value in water than glycerol and agar. Further, at the lower concentration on NPs showed better thermal efficiency than higher concentrations.

Synthesis, Characterization, and Study of Thermal Response of Cu-Doped Fe3O4 Nanoparticles

The study was designed to synthesize bromide-bridged mercury(II) symmetric and non-symmetric N-heterocyclic carbene complexes. The preparation of benzimidazolium salts (4–6) was accomplished by sym...

In-situ approach for the synthesis of bromide-bridged mercury(II) N-heterocyclic carbene complexes

Biochar caged zirconium ferrite nanocomposites for the adsorptive removal of Reactive Blue 19 dye in a batch and column reactors and conditions optimizaton

Yasir Jamil

Papers

Photovoltaic-Based Nanomaterials: Synthesis and Characterization

Graphene Functionalized PLA Nanocomposites and Their Biomedical Applications

Synthesis, Characterization, and Study of Thermal Response of Cu-Doped Fe3O4 Nanoparticles

In-situ approach for the synthesis of bromide-bridged mercury(II) N-heterocyclic carbene complexes

Biochar caged zirconium ferrite nanocomposites for the adsorptive removal of Reactive Blue 19 dye in a batch and column reactors and conditions optimizaton