Morphology Control in Gold Nanoparticle Synthesis

Morphology Control in Gold Nanoparticle Synthesis Hammed A. Salami Introduction One of the most significant current discussions in the field of nanotechnology is the development of novel nanomaterials. When materials are reduced from bulk to the nanometer-scale dimension, they begin to exhibit unusual physical and chemical properties [1, 2]. Recently, researchers have shown an increased interest in the elucidation of the structure-function relationship of these novel nanomaterials [3, 4]. The availability of imaging techniques with nanometer resolution, such as electron microscopy has not only helped in visualizing the individual nanoparticles, but also, it has facilitated an understanding of some of the emerging properties of noble metal nanoparticles such as spectroscopic enhancement and localized surface plasmon resonance (LSPR) [5, 6]. For noble-metal nanoparticles, these structure-function relationships have attracted significant research interests. This is because, unlike in bulk metal materials, the control of the chemical and physical properties of noble-metal nanoparticles is possible with a modification of their size and shape, and by varying the material composition [1, 6]. As a result of the unique roles played by size and shape in influencing the properties of noble-metal nanoparticles, researchers have continually focused on ways to reproducibly tailor these parameters in other to adapt the nanoparticles for optimal use in a wide range of applications, including biology[4], energy[7], sensing, spectroscopic enhancement[8-10] and catalysis [7, 11]. The size of nanoparticles influences their optical properties while the shape and crystallographic facets are the major factors that determine their catalytic and surface activities [12]. Nanoparticles with non-spherical structures are referred to as anisotropic nanoparticles. Examples include nanocubes, nanoprisms, nanorods, etc. [13]. They show pronounced shape-dependent properties and functionalities, therefore a great deal of research effort has been paid at developing synthetic strategies to get a high yield of anisotropic noble metal nanoparticles having uniform structures and controlled shape and size[5]. The deliberate control of shape has however proven to be the most challenging, despite being one of the useful parameters for optimizing the properties of noble metal nanoparticles. This is particularly more pronounced in gold nanoparticles synthesis [3, 14-16]. Of the many shapes of gold nanoparticles, gold nanorods have continued to attract the most attention [2]. This is largely due to the large number of synthetic methods available, the possibility of high monodispersity and the control over the aspect ratio, which accounts for the change in their optical properties [17]. When molecules are adsorbed on the surface of gold nanoparticles, they undergo surface-enhanced Raman scattering (SERS) effects. This is due to the coupling effect of the plasmon band of the irradiated metal with the molecules electronic states [18, 19]. For gold nanorods, two Plasmon bands are prominent. They are the longitudinal plasmon band and the transverse plasmon band. These bands correspond to light absorption and scattering along the long and short axis of the particle respectively [20-22]. While the longitudinal surface plasmon resonance increases with larger aspect ratios (length/diameter), the transverse surface plasmon resonance is usually on the same wavel ength as that of nanospheres, with no dependence on the aspect ratio[23]. The current high dependence on non-renewable feedstocks can be minimized with the production of fine chemicals, petrol-derived commodities and polymer precursors from biomass[24]. Supported gold nanoparticles have been found to be very active catalysts for a number of biomass transformation and many researchers have focused their attention in searching for the best supports, reaction conditions and mechanistic studies to improve their selectivity[25, 26]. Most catalytic studies in literature involving noble metal nanoparticles, either as mono- or bimetallic catalyst, are done with spherical nanoparticles [25-27]. The spherical nanoparticles used are usually immobilized onto suitable supports to form impregnated catalysts and in some cases they are preformed before immobilization [27]. To achieve this, methods such as wet impregnation, sol immobilization etc. are often used [28, 29]. These methods however, do not allow the control of morphology of the nanoparticles. There is therefore the need to develop an understanding of morphology control in the synthesis of anisotropic noble metal nanoparticles with high yield. It would also be interesting to explore the correlation between these controlled morphologies and catalytic activities. Project Aims This project will therefore aim at synthesising various morphologies of mono and bimetallic noble metal nanoparticles, with optimum control of the morphology during the synthesis. Starting with gold, we will also explore the use of colloidal methods in immobilizing the preformed nanoparticles with selected morphologies and narrow particle size distribution e.g. gold nanorods, onto suitable supports to form heterogeneous catalysts. Since the rods expose certain crystallographic planes more than most other morphologies and also have comparatively low coordination sites, they can be potentially more selective for reactions that preferably occur on low coordination sites. As a starting point we will therefore, explore their use as supported heterogeneous catalysts in selective oxidation and hydrogenation reactions for biomass transformation. References [1]M.-C. Daniel, D. Astruc, Chemical reviews 2004, 104, 293-346. [2]J. Pà ©rez-Juste, I. Pastoriza-Santos, L. M. Liz-Marzà ¡n, P. Mulvaney, Coordination Chemistry Reviews 2005, 249, 1870-1901. [3]M. L. Personick, C. A. Mirkin, Journal of the American Chemical Society 2013, 135, 18238-18247. [4]X. Ma, M.-C. Wang, J. Feng, X. Zhao, Acta Materialia 2015, 85, 322-330. [5]C. J. Murphy, T. K. Sau, A. M. Gole, C. J. Orendorff, J. Gao, L. Gou, S. E. Hunyadi, T. Li, The Journal of Physical Chemistry B 2005, 109, 13857-13870. [6]L. T. Lanh, T. T. Hoa, N. D. Cuong, D. Q. Khieu, D. T. Quang, N. Van Duy, N. D. Hoa, N. Van Hieu, Journal of Alloys and Compounds 2015, 635, 265-271. [7]G. A. Somorjai, H. Frei, J. Y. Park, Journal of the American Chemical Society 2009, 131, 16589-16605. [8]J. E. Millstone, S. J. Hurst, G. S. Mà ©traux, J. I. Cutler, C. A. Mirkin, Small 2009, 5, 646-664. [9]M. R. Jones, K. D. Osberg, R. J. Macfarlane, M. R. Langille, C. A. Mirkin, Chemical reviews 2011, 111, 3736-3827. [10]A. R. Tao, S. Habas, P. Yang, small 2008, 4, 310-325. [11]N. Tian, Z.-Y. Zhou, S.-G. Sun, Y. Ding, Z. L. Wang, science 2007, 316, 732-735. [12]K. L. Kelly, E. Coronado, L. L. Zhao, G. C. Schatz, The Journal of Physical Chemistry B 2003, 107, 668-677. [13]M. Treguer-Delapierre, J. Majimel, S. Mornet, E. Duguet, S. Ravaine, Gold Bulletin 2008, 41, 195-207. [14]S. Koeppl, N. Ghielmetti, W. Caseri, R. Spolenak, J Nanopart Res 2013, 15, 1-11. [15]S.-S. Chang, C.-W. Shih, C.-D. Chen, W.-C. Lai, C. R. C. Wang, Langmuir 1999, 15, 701-709. [16]X. Ma, M.-C. Wang, J. Feng, X. Zhao, Journal of Alloys and Compounds 2015, 637, 36-43. [17]C. Burda, X. Chen, R. Narayanan, M. A. El-Sayed, Chemical reviews 2005, 105, 1025-1102. [18]R. L. Garrell, Analytical Chemistry 1989, 61, 401A-411A. [19]A. Campion, P. Kambhampati, Chem. Soc. Rev. 1998, 27, 241-250. [20]G. L. Hornyak, C. J. Patrissi, C. R. Martin, The Journal of Physical Chemistry B 1997, 101, 1548-1555. [21]K. L. Kelly, E. Coronado, L. L. Zhao, G. C. Schatz, The Journal of Physical Chemistry B 2003, 107, 668-677. [22]I. O. Sosa, C. Noguez, R. G. Barrera, The Journal of Physical Chemistry B 2003, 107, 6269-6275. [23]S. Eustis, M. A. El-Sayed, Chemical society reviews 2006, 35, 209-217. [24]G. Budroni, A. Corma, Journal of Catalysis 2008, 257, 403-408. [25]M. Boronat, 2013, 25, 50-76. [26]O. Casanova, S. Iborra, A. Corma, ChemSusChem 2009, 2, 1138-1144. [27]S. Albonetti, T. Pasini, A. Lolli, M. Blosi, M. Piccinini, N. Dimitratos, J. A. Lopez-Sanchez, D. J. Morgan, A. F. Carley, G. J. Hutchings, F. Cavani, Catalysis Today 2012, 195, 120-126. [28]L.-S. Zhong, J.-S. Hu, Z.-M. Cui, L.-J. Wan, W.-G. Song, Chemistry of Materials 2007, 19, 4557-4562. [29]S. E. Davis, B. N. Zope, R. J. Davis, Green Chemistry 2012, 14, 143-147. 1

Chick Enhancer

Poultry-raising is one of the businesses that can be found here in the Philippines. It’s very simple and helpful, as chickens provide foods like chicken meat and eggs. It could also help in the agriculture area. Some people use supplemental feeds so that the chickens may grow fast. But now, we’re going to have a study to find a natural and better substitute, like Aloe Vera (Aloe barbadensis) and Malunggay (Moringa oleifera) as additives in making supplemental feeds. Aloe vera is a succulent plant species that probably originated in northern Africa. The species does not have any naturally occurring populations, although closely related aloes do occur in northern Africa. The species is frequently cited as being used in herbal medicine since the beginning of the first century AD. Extracts from A. vera are widely used in the cosmetics and alternative medicine industries, being marketed as variously having rejuvenating, healing, or soothing properties. There is, however, little scientific evidence of the effectiveness or safety of Aloe vera extracts for either cosmetic or medicinal purposes, and what positive evidence is available is frequently contradicted by other studies. Aloe vera is one of the only known natural vegetarian sources of Vitamin B12, and it contains many minerals vital to the growth process and healthy function of all the body's systems. Moringa oleifera is the most widely cultivated species of the genus Moringa, which is the only genus in the family Moringaceae. In developing countries, moringa has potential to improve nutrition, boost food security, foster rural development, and support sustainable landcare. It may be used as forage for livestock, a micronutrient liquid, a natural anthelmintic and possible adjuvant. Supplemental Feeds, one of the cheapest and most useful ways to improve the growth of chickens. Statement of the Problem: This study aims to determine the effects of Aloe Vera and Malunggay as additive components in making supplemental feeds. The researchers would like to seek the answer to the problem â€Å"Can Aloe Vera and Malunggay extract be an alternative for growth and weight enhancer on chicks? † If so, what is/are the side effects of Aloe Vera (Aloe barbadensis) and Malunggay (Moringa oleifera) extract in: * Growth Skin Color * Other characteristics Hypothesis: Ho: Aloe Vera and Malunggay extracts are not useful as additives in making supplemental feeds. Ha: Aloe Vera and Malunggay extracts are effective for using it as additive components in making supplemental feeds. Significance of the Study: There is an increase of demand of chicken today. Most of the restaurants in our country are using chicken for their specialty. As we all know chicken is one of the most common foods that we eat, and that is our reason of pursuing this project. We would like to help the poultry-raisers to raise chickens in a small period of time. If we succeeded with this project we can also help our economy to grow and make it more influential. This project is also against on non-organic raisers because we are not sure about the side effects of that chemical once we intake the chicken. We want to prove that even we are a student we can help in our own little way. The fact that Aloe Vera and Malunggay are highly available and cheaper, this will help people, especially in business industries. They can even do it on their own.

Cold War Essay

The existing tensions between the United States and the Soviet Union proceeded to spike between 1945 and 1950. The disputes between these two countries pressured them to start a war. Of the post World War II goals that contributed to the Cold War, there were a prominent few, including the â€Å"Iron Curtain†, the Truman Doctrine, the Marshall Plan, and NATO. During the Cold War, competition for methods of weaponry skyrocketed. Some of said tactics were Satellite nations, the Space Race, and the buildup of arms. Originally, The United States and the Soviet Union formed a bond simply because of their mutual fear that the Nazis would gain control over Europe. After the war was over, restructuring of Europe commenced. When this began to happen, a power struggle between the Soviet Union and the United States developed. The tension continued to rise, but neither wished to go to war because of the whopping number of lives taken from World War II, therefore, the term â€Å"Cold War† makes sense. Winston Churchill gave his famous â€Å"Iron Curtain† speech on March 5th, 1946, which mainly focussed on changing the world’s view of Stalin and his dictatorship. Citizens were blind to Stalin’s cruel dictatorship, simply because they needed some kind of leader. Churchill stated in his speech that, the â€Å"Iron Curtain† separated West and Eastern Europe. The East European government adopted a communist system and fell under the control of the U.S.S.R. (Doc #1). This created tension, induced by ideology differences. President Truman made up a plan, in which he felt that there should be a policy of the United States to provide financial aid to countries who are trying to avoid domination from other countries. Truman gave $400 million in aid to Turkey and Greece (Doc. #2). This heightened pressure between the U.S. And other countries because of how strong the U.S. obviously was, compared to any other country. This was also a threat to other countries. Marshall, secretary of State, stated that the vast amount of political, economical, and social damage Europe were going through would not only effect the continent itself, but the world as a whole. He stated that this was a major concern, and the U.S. should do everything in its power to fix this torn continent. He stated that without the assistance, there would be ongoing hunger and poverty (Doc. #3). Marshall gave $13 billion to Europe to aid the damage. The Truman Doctrine, and the marshall Plan, were both attempts to maintain successful political, economical, and social stability throughout the world to prevent the post war downfall from occurring once again. Joseph Stalin, dictator of the Soviet Union, captured Berlin. This upset many countries and so, NATO was born. They believed that an attack on one country was an attack on them all. The arms race occurred as a result because the countries stated that armed forces would be used if necessary to protect a country who had to undergo an armed attack.

Group Is A Uk Based Gambling - 905 Words

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