New spectroscopic Methods-Analysis of Nanoparticle Structure

Scientists conducted a joint research and have developed an 'Optical Nano-Crystallography Analysis Method' that can analyse the crystal structure of semiconductor nanoparticles only by measuring absorption spectrum. Semiconductor nanoparticles, widely known as quantum dots, are unique nanomaterial that’s optical and electrical properties are variously controlled by the size and shape of the particles. They are used in various science and technology fields, including LED, solar cell, photoelectric sensor, bimolecular imaging, etc.

Analysts propose simple examination technique to distinguish the structure of semiconductor nanoparticles in arrangement just by estimating ingestion range. It is relied upon to display another heading for the investigations of the structure and the properties of nanoparticles.

The II-VI and III-V compound semiconductors are polymorphic materials that can have different crystal structures of Zinc Blende structure and Wurtzite structure. To understand and control the optical, electrical, and morphological characteristics of these nanoparticles, it is essential to accurately and efficiently analyse the crystal structure of the nanoparticles.

However, the X-ray diffraction method, which is widely used for the existing crystal structure analysis of nanoparticles, requires expensive analysis equipment and needs a large amount of refined powdery nanoparticles, which makes the analysis process cumbersome and costly. Moreover, there is a limitation that it cannot be directly applied to nanoparticle samples that are usually synthesized, purified and stored in a solution.

This 'Nano-Optical Crystallography Analysis Method' will enable the precise observation of the crystal structure of nanoparticles of less than 2 nanometres, which is difficult to accurately analyse by X-ray diffraction technique. It can also rapidly predict the crystal structure of polytypic nanoparticles.

Sung Jun Lim, and Professor Andrew M. Smith of the University of Illinois, United States, conducted a joint research and has developed a 'Optical Nano-Crystallography Analysis Method' that can analyse the crystal structure of semiconductor nanoparticles only by measuring absorption spectrum.

This study has been published in the online edition of Nature Communications, the sister journal of Nature, an international academic journal.

For more info on these topics, please attend Crystallography Congress 2018 and share your research knowledge and latest updates and submit your research papers on crystallography, nanotechnology, material science and related topic please visit: https://crystallography.materialsconferences.com/call-for-abstracts.php

Contact:

Jessica Mark

Program Manager | Crystallography Congress 2018

Email: novelmaterials@materialsconferences.org

Smart Materials-Future Prospects:

Smart materials display response in a controlled manner in environments that change. It comprises of unique molecular structure, smart materials respond to a wide array of external stimuli such as electric fields, magnetic fields, pressure, temperature, moisture, and chemicals.

The major factors driving the growth of smart materials market are the rising demand for sensors and actuators in consumer electronics, aerospace & defence, and consumer goods have propelled the demand. Other aspects such as increasing demand of piezo-electric devices in the different end-user application are likely to trigger the smart materials market. These devices are used in industries such as medical devices, robotics, information, automotive, information technology and telecommunication. Further, bionics and flourishing artificial organ industry are likely to boost the smart materials market.

 Types of smart materials:

·         Piezoelectric

·         Shape Memory Alloys

·         Magneto strictive

·         Shape Memory Polymers

·         Hydrogels

·         Electroactive Polymers

·         Bi-Component Fibres

Smart materials are the advanced material that will sense and respond to a wide range of stimuli, in various fields like electric, nuclear radiation, magnetic fields, pressure, hydrostatic pressure, temperature, mechanical stress, and pH change. The different and the most unique property of these materials allow them to change to their original state the scientists and researchers have found a most simplified, low-cost method to make and produce particles of undercooled metal.

These materials have these properties like magneto strictive, piezoelectric, electro chromic materials shape memory, phase change and have gained a wide range of industrial acceptance. Moreover, electro active polymers, ferromagnetic shape memory alloys, carbon nanotube actuators conductive polymers, and are few of the emerging smart materials in the market, with strong application potential soon.

Attend our upcoming conference “4th International Conference on Crystallography & Novel Materials”, during November 19-20, 2018 at Bucharest, Romania and share your knowledge and latest updates regarding smart materials and material science

Contact:

Jessica Mark

Program Manager | Crystallography Congress 2018

Email: novelmaterials@materialsconferences.org

Growth of Nanowires through Experiments

Scientists observe nanowires through X-ray experiments reveal exact details of self-catalysed growth responsible for the evolving shape and crystal structure of the crystalline nanowires with desired properties.

Their observations on Nano wires reveals accurate details of the growth process that is responsible for crystal structure and shape of the crystalline nanowires. The experimental researches also provide new methods and approaches to make nanowires with desired properties for specific applications.

The semiconductor gallium arsenide (GaAs) is broadly utilized, for example in infrared remote controls, the high-recurrence segments of cell phones and for changing over electrical signs into light for fibre optical transmission, and in sun-oriented boards for arrangement in rocket..

To manufacture the wires, the researchers utilized a technique known as the self-catalysed Vapour-Liquid-Solid (VLS) strategy, in which small beads of fluid gallium are first saved on a silicon precious stone at a temperature of around 600 degrees Celsius. Light emissions particles and arsenic atoms are then coordinated at the wafer, where they are absorbed and break down in the gallium beads. 

Application of nanowires:

·         Electronic devices

·         Nanowire lasers

·         Sensing with silicon nanowire FET devices

If you have the latest updates and research on Material Science and Nanotechnology you can present, your thoughts and views in our upcoming conference Crystallography Congress 2018 in November 19-20, 2018.

Contact:

Jessica Mark

Program Manager | Crystallography Congress 2018

Email: novelmaterials@materialsconferences.org

NMR Crystallography

Nuclear Magnetic Resonance (NMR) crystallography is a type method that uses primary NMR spectroscopy to find the structure of different solid materials in the atomic scale. So, the solid-state NMR spectroscopy will be used primarily, and possibly supplemented by quantum chemistry calculations (e.g. density functional theory), powder diffraction etc. If crystals are grown properly and uniquely, any crystallographic method can generally be used to determine the crystal structure and in case of organic compounds the molecular structures and molecular packing. The main use of NMR crystallography is in determining micro crystalline materials which are used to this method but not to X-ray, neutron and electron diffraction. This is largely used because interactions that are short range are measured in NMR crystallography.

NMR can now be used to refine diffraction results and, in favorable cases, to solve crystal structures with minimal (or even no) diffraction data. The increasing ability to relate chemical shifts (including the tensor components) to the crystallographic location of relevant atoms in the unit cell via computational methods has added significantly to the practice of NMR crystallography. Diffraction experts will increasingly welcome NMR as an allied technique in their structural analyses. Indeed, it may be that in the future crystal structures will be determined by simultaneously fitting diffraction patterns and NMR spectra.

NMR chemical shifts can distinguish between static and dynamic disorder in crystalline materials and can be used to determine modes and rates of molecular exchange motion. NMR crystallographic methods are frequently used in combination with diffraction methods. Long-range order is not a requirement for NMR studies of solids, and so NMR can offer advantages for studying disorder, guest dynamics, and amorphous or heterogeneous systems.

For more details kindly go through: https://crystallography.materialsconferences.com/

Contact:

Jessica Mark

Program Manager | Crystallography Congress 2018

Email: crystallographycongress2018@gmail.com