Synthesis and Characterization of Magnetite Ferrofluid

Synthesis and Characterization of Magnetite Ferrofluid Abstract A Fe3O4 water-based ferrofluid was prepared by chemical co-precipitation technique, the magnetic particles were characterized using x-ray diffraction(XRD),transmission electron microscopy(TEM) and vibrating sample magnetometer)VSM)techniques.the results show that the shape of the nanoparticles is approximately spherical and they are superparamagnetic at room temperature. 1. Introduction Ferrofluids are stable colloidal suspensions that consist of magnetic nanoparticles dispersed in base liquid such as water or oil [1]. A ferrofluid is a colloidal dispersion of monodomain magnetic particles (size of about 10 nm) of superparamagnetic nature. Superparamagnetic iron oxide nanoparticles are small synthetic Fe 3 O 4 or ÃŽ ³-Fe 2 O 3 particles with a core size of o10 nm and an organic or inorganic coating. The particles are well dispersed in a liquid, for medical application normally in water. Superparamagnetic magnetization is, compared to normal paramagnetic materials, much higher and can reach nearly the magnetization saturation (M s ) of ferromagnetic iron oxide. This behavior allows the tracking of such particles in a magnetic field gradient without loosing the advantage of a stable colloidal suspension.[S2] Ferrofluids are stable suspensions of magnetic nanoparticles and include Fe 3 O 4 , CoFe 2 O 4 , Mn–Zn , Co–Zn and lithium ferrite in a base liquid. The liquid can be polar or nonpolar . To avoid nanoparticles agglomeration, the magnetic particles have to be coated with an appropriate surfactant .This coating makes the ferrofluid stable even under intense magneticfields . ferrofluids are widely used in industry and clinical applications .[w2] Magnetic fluids (ferrofluids) with a combined fluidic and magnetic properties have wide applications inindustry and biomedicine. Magnetic Nanoparticles ,such as magnetite(Fe 3 O 4 ),iron(Fe),nickel(Ni),andcobalt(Co),can be applied in magnetic fluid preparing.Among these magnetic NPs Fe 3 O 4 has been extensively adopted in magnetic fluids for its tunable magnetic properties.so far many synthetic strategies are proposed to prepare magnetic fluids of Fe 3 O 4 nanoparticles.Hereinto ,co-precipitation method in oil or water with the presence surfactants is traditional route to prepare magnetic fluids.[A1] Magnetic nanofluids, also called ferrofluids, are stable colloidal solutions consisting of magnetic nanoparticles dispersed in a based fluid. The magnetic nanofluid behaves as a smart or functional fluid due to some of its unique features. They have some applications in a variety of fields such as electronic packing, mechanical engineering, aerospace, and bioengineering. [i1] Water-based magnetic nanofluids are a special category of polar magnetic nanofluids with particular features of particle interactions and agglomerate formation processes. The interest in water-based magnetic nanofluids in the selected bioengineering and biomedical systems has been growing exponentially in the last decades .Surface coating of nanoparticles and colloidal stability of biocompatible water-based magnetic nanofluids are particularly important for biomedical applications such as magnetic cell separation, drug delivery, hyperthermia, and contrast enhancement in magnetic resonance imaging. They have been extensively applied to audio voice coil-damping, intertia-damping apparatuses,bearings, stepping motors, and vacuum seals.[i1] Ferrofluids, which are magnetic colloids, can be synthesized by dispersing nanosized subdomain magnetic particles of ∠¼10 nm in diameter in a carrier liquid. Such fluids have physical properties that can be modified by an external magnetic field and are widely used as functional materials in engineering and technology applications.[j1] In general, magnetic nanoparticles in ferrofluids are coated with a surfactant to prevent aggregation.In the 1980s, Massart proposed a method for chemical synthesis of aqueous ferrofluids with no surfactant .In this method, an appropriate surface treatment leads to adsorption of H+ or OH−ions on the surface of the particles, so stable aqueous ferrofluids can be obtained. These ferrofluids are known as ionic ferrofluids or electrical double-layered magnetic fluids .Ionic ferrofluids have attracted considerable attention because of their special behavior and this has led to new cross-disciplinary activities inchemistry, biomedicine and physics.[j1] Ferrofluids of Fe3 O4 and ÃŽ ³-Fe2 O3 have attracted considerable attention for various biomedical applications including therapeutic magnetic hyperthermia,targeted drug delivery,and magnetic resonance imaging due to their bio-compatibility and desirable superparamagnetic properties with high saturation magnetization.[M1] Transition metal oxide nanoparticles (NPs) such as magnetite (Fe 3 O 4) and maghemite (ÃŽ ³ -Fe 2 O 3 ) are of general interest, due to their interesting magnetic, electrical, mechanical, catalytical and optical properties.[Q1] Iron oxide nanoparticles can also be dispersed in specific carrier liquids, giving rise to the so called ferrofluids (FFs0. In particular, FFs are colloidal suspensions of magnetic NPs (usually magnetite or maghemite) with average size in the range from 8 to 20 nm and dispersed in organic/inorganic solvents or different oils(hydrocarbons, syntetics esters, etc). They combine the fluid related properties of the dispersing liquid with the magnetic properties of the solid NPs.[Q1] FFs have proved to be useful for a wide variety of engineering applications such as: (i) ironless loudspeakers (ii) specific components for magnetic recording ,(iii) biomagnetics (e.g. hyperthermia ,tissue repairing ,target drug delivery ,cell separation ,magnetic resonance imaging, sensing )(iv) rotating seals and so on. Most of the applications of FFs are related to both their overall thermo/hydrodynamic properties and the magnetic properties of the constituent NPs.[Q1] Fe3O4 nanoparticles are most frequently chosen because of following reasons:(i) Fe3O4 is biocompatible,(ii) Fe3O4 nanoparticles can be synthesized at large scale,(iii)the magnetization of Fe3O4 nanoparticles is significantly high,thus allowing these particles to be easily controlled by an external magnetic field.[R1] Colloidal suspensions of magnetic nanoparticles dispersed in an organic or inorganic carrier liquid,so-called ferrofluids ,are being increasingly studied because of their peculiar physical properties and applications .Because of their small size (5–20 nm) the particles exhibit single magnetic domains and the magnetic fluid displays superparamagnetic behavior .Without external magnetic field the orientation of the magnetic moments of the particles is at random resulting in a vanishing macroscopic magnetization. An external field, however, easily orients the particle magnetic moment leading to large saturation values of the magnetization. Ferrofluids are classified into two groups ,ionic (IFF) and surfacted (SFF) ferrofluids, depending on the method used to avoid the aggregation of magnetic particles.[T1] Ferrofluids are actually superparamagnetic, meaning that a ferrofluid reacts to a magnetic field in the same way as a ferromagnetic or ferrimagnetic solid, but magnetizes and demagnetizes more rapidly because in a ferrofluid the magnetic domains are the same size as the actual particles.[v1] Ferrofluids are colloidal dispersions of small single domain magnetic particles suspended in a carrier fluid.Ferrofluids characteristically have both magnetic and fluid properties and have found a diverse range of applications,such as in audio devices, inertia dampers, stepper motors,sensors, vacuum seals, electromagnetic shielding, and high density digital storage.[W1] Namely, besides the customary superparamagnetism a strong reduction of the magnetization of nanoparticles with respect to bulk value is observed. By both implicit and explicit tests, this reduction was proven to be due to a noncollinear spin structure.[s1] Ferrofluids containing magnetic nanoparticles with single domains and superparamagnetic at room Temperature and well-dispersed in a carrier fluid are both of fundamental and applied interest in biomedicine,mechanical and sensor technologies,and room temperature magnetic refrigerators.[y1] (In this research),(in the present work),(in this study) the magnetic Fe3O4 nanoparticles were synthesized by co-precipation method.the XRD,TEM and TEM techniques were used to characterize the structure and the size of the nanoparticles.the magnetic properties were evaluated by vibrating sample magnetometer.the Fe3O4 nanoparticles were dispersed into water to obtain the desired nanofluids.tetramethyl ammonium hydroxide was used as dispersant. 2. Experimental Details: or 2. Synthesis and characterization 2.1 Materials The starting materials used in this work were ferric chloride hexahydrate(Fe Cl3.6 H2O),ferrous chloride tetrahydrate(Fe Cl2.4H2O) aqueous ammonia and tetramethyl ammonium hydroxide(N(CH3)4OH). 2.2 Synthesis procedure An acqeous ferrofluid material was prepared by a co-precipitation method . The synthesis is based on the reaction of iron ions in an aqueous ammonia solution to form magnetite Fe3O4 in the following form: 2Fe3++Fe2++8NH3.H2O=Fe3O4+8NH4+ +4H2O To synthesis Fe3O4 nanoparticles, Fe Cl3.6 H2O (1M) and Fe Cl2.4H2O (2M) were prepared by dissolving iron salts in HCl (2M) solution.typically , 4ml of Fe Cl3 and 1ml of Fe Cl2 were mixed in a molar ratio of 2:1.then 50ml of ammonia aqueous solution was added into the solution with vigorous stirring at room temperature.a black precipitate was obtained.the precipitate was separated by applying a magnet and washing with distilled water several times until the PH decrease to7. tetramethyl ammonium hydroxide was used as dispersant.the nanoparticles are coated with hydroxyl ions of the tetramethyl ammonium hydroxide ,which themselves attract a sheath of strong positive ions.this surface structure creates electrostatic interparticle repulsion that can overcome coagulation forces of magnetic and van der waals attractions. 2.3 Characterization X-ray powder diffraction(XRD)patterns were obtained by an X-ray diffractometer using KÃŽ ± radiation(ÃŽ »=1.54060Ã…) (  ´Ã‚ ®Ã‚ µÃ‚ ª  ´Ã‚ ªÃ‚ ± „ ²  ³Ã‚ ªÃ… ¸) The shape,size distribution and morphology of the particles were examined by using transmission electron microscope(TEM).( )(The nanoparticles are characterized in detail by TEM). TEM experiment was performed on a Philips CM30 electron microscope with an acceleration voltage of 150 kV. Magnetization versus applied field were carried out withVSM (Lake shore 7404). 3. Result and Discussion Fig. 1 shows the X-rays powder diffraction pattern of iron oxide nanoparicles in the ferrofluid sample.the spectral lines are broad because the grain are small.()relatively wide peaks are related to small size of nanoparticles. all the observed peaks can be indexed to the Fe3O4 crystal structure .the peaks are characteristic of cubic system with Fd-3m space group.()the considered profile can be suitably fitted by considering the crystalline structure of either magnetite(cubic structure,Fd-3m group,ICSD reference code 98-011-1284)or maghemite(cubic structure P4132 group,ICSD reference code 00-39-1346).beacuse of overlapping reflections in the XRD pattern,it was not possible to obtain a good fit by taking simultaneously into account both phases. using the Debye-scherer equation,the crystallite size was determined to be around 10 nm. Fig .1. XRD spectra of the particle Fig .2. TEM image of Fe3O4 nanoparticles TEM image(Fig. 2)show that the particles are roughly spherical and polydispersed))(approximately spherical in shape).The particle sizes, by considering about 115 particle, range from 8to30nm. the average size of the particles observed in the TEM image is in the range of 13nm, which is good agreement with that estimated by Debye-Scherrer formula from the XRD pattern.( )This is larger than the crystallite size determined by XRD,perhaps due to the presence of an amorphous surface layer. (the difference between XRD and TEM may come from the surface coating layer). fig .3. Magentic hysteresis of Fe3O4 Fig. 3 displays the magnetic hysteresis curve of the ferrofluid evaluated by VSM at room temperature,which is obtained from the magnetization cycle.we can see that the saturation magnetization(Ms)of the Fe3O4 nanoparticles was about 35 emu/g which is lower than that of the bulk Fe3O4 (92 emu/g).the Ms value decrease with decrease in crystallite size for mono-domain particles due to the surface spin canting (disorder) and thermal fluctuations.[i1]. ( Komada et al. have attributed the reduction of magnetization in magnetic oxide nanoparticles to the existence of canted spins and /or a spin-glass-like behavior of the surface spins.[M1]). The saturation magnetion might decrease on Fe3O4 →Î ³ Fe2O3 transformation because the magnetization of ÃŽ ³ Fe2O3 is slightly less than that of Fe3O4 in bulk materials.[j1] It is well known that the Fe3O4 nanoparticles show a superparamagnetic property. When a magnetic field was applied, the dipolar particles aligned themselves with the applied magnetic field, and resulted in a measurable magnetization. The saturation magnetization of theferrofluid was about 35 emu/g in the ferrofluid, which was lower than the saturation magnetization of pure Fe3O4 nanoparticles (50 emu/g), due to the fact that the saturation magnetization reduced significantly when the particle size was smaller than 10 nm. Also, the saturation magnetization of Fe2O3 nanoparticles was lower than that of Fe3O4 nanoparticles .So the saturation magnetization of nanoparticles in the ferrofluid, which consisted of a small amount of Fe2O3 nanoparticles, was lower than that of pure Fe3O4 nanoparticles.[w1] Furthermore, zero remenance and nearly zero coercivity can be observed for the nanoparticles on the hysteresis curve, which indicates that the particles are superparamagnetism.this is related to the fine crystallite size of Fe3O4 particles,which are in the nanometer range. 4. Conclusion In this study, superparamagnetic magnetite ferrofluid were successfully synthesized. The XRD,TEM and VSM techniques were used to characterized the structure size and magnetic properties of nanoparticles. It was concluded that the spherical nanoparticles synthesized in this work were superparamagnetic

Managing A Business Event Essay

Event organisers are in charge of all parts of an event. They co-ordinate all aspects, from the beginning right through to the end, overseeing all the details and ensuring everything gets completed on time and on budget. While there is a great variety between the different types of events and the different tasks an event organiser will need to do, there are some parts which are almost always the same. Venue/Location The location or locations are very important for different kind of events, the actual event interprets the location which goes with it for example a football match in the world cup will require a 30,000 allocation plus depending on which team is playing. When Brazil is playing for example then they will need a 50,000 or even 60,000 plus seater stadium. It is important that the right stadium catered for the right people because they could be losing money if there are lots of unsold tickets. They have to make sure that there is enough leg room and room for people to pass through without making others move form their seat, they also have to cater for upper class to make sure they get the quality which they want. Catering For the world cup there has to be tons of food outlets both inside and outside the ground so they not only cater for everyone their but they cater for all their needs whatever they may be such as vegetarian or gluten free and other different eating habits. They have to have 10’s of thousands of burgers hotdogs batches of chips which are most commonly found in football stadiums around the world. They have to make sure they have enough food to last the big rush of customers which often come before half time or on half time because if they queue up for over 10/20 minutes and they don’t get the food they will be annoyed and they would also would miss the first 5 minutes of the first half. The speed of the delivery has to be very fast to get 100’s of customers with their food and drink and out as soon as they can their will be around a 25 minute gap to do this before the second half starts. Finally drinks have to be provided and both alcoholic and non-alcoholic must b e served to cater for young and old. Planning and  reserving facilities Facilities which need to be reserved and booked in advance are things like burger vans and drinks vending machines all these will have to be booked or bought in advance. Referees will have to be contacted prior to the world cup to make sure that they are okay to referee the in the games. Obviously the main important thing which needs to be free and ready to use is the various number of stadiums and to make sure that they’re not being used for another other reason. The car spaces will have to be planned and also bus routes to make transport quick easy and efficient for travelling fans and teams from hotels. Setting up The set up for the world cup started as soon as Brazil was announced as the hosts for the tournament. The first things which were set up were the plans of stadiums and thee transport links such as the numerous shuttle busses. Another first initial set up is to make sure it is safe for all fans and players so the Brazilian government have ordered army troops into the favelas of Brazil which are situated near the grounds, so the first few steps were to make sure transport links were designed as well as new pitches and also the security was put in place to calm down hot spots of violence around the city. Accommodation is another vital thing for the world cup because there will be 10’s of thousands of supporters going to the world cup so they need to make sure there is enough places for people to stay for the appropriate time failure to do this will have people sleeping on the streets which could cause turmoil in the streets, like thieving for example. Programme The programme for the world cup is made a few months in advance because people need to know when to book flights there and back so they know when the game is and how many games they can afford to stay for depending how large the gap is between the two games this is important to be released fairly early so supporters know when to book time off work and how many days they are. Preparing and distributing supporting documents For the world cup this is sending additional information to the buyers and  telling them things like transport links accommodation and also things like sending over the tickets which ay when the game is and what time it kicks offs these will be sent to the buyers house prior to the world cup so they can understand where to go and what to do nearer the time. Organisational procedures These things are like how many people the stadium fits and how many people are allocated to be in line waiting in the queue this is so that there won’t be any safety hazards such as getting injured via pushing and shoving in the queue. Another organisational procedures are the set times which the teams are lined up to play such as making sure that no games clash and they ar4e all at different times. Legal requirements Some of the legal requirements include: making sure no vandalism is done to the ground as the buyer has agreed to this once purchasing the ticket another requirement is that the people selling things around the ground that they stay in their agreed place and don’t move over into other sellers zones this could cause violence as another is acting upon another location. So the sellers agree to stay in their assign place. The standard football match agreement is also in place in the world cup which is no racist or violent behaviour towards players or the opposition’s fans. Limits of role As an event organiser it is important that they don’t do all the work and that they share the work load to other people who specialise in different areas such as giving the food responsibility to people who know what the fans want and what the number of items of food per match needs to be ordered. So it is important that the event organiser is able to dish jobs out however must keep an eye on what’s happening and making sure that the jobs are being done correctly by the other people who have been asked of the organiser. I is important to make sure that the organiser keeps an eye out on the other because they need to know if they’re on course to finish the job on time and to the best possible standard in which they can possibly do An event organiser needs the following skills to do their job effectively: Communication and interpersonal skills- This is critical to have as an organiser because they need to do a lot of telling people what to do and where to go. They need to be able to communicated with all sorts of working varying from business wear to builders to make sure that they are doing their jobs and to make sure that they’re on schedule. Time management- It is important for an event organiser to have good time management because they have a number of different things going on all the time and they have got to make sure each one is finished on schedule to make sure everything will be finished on time and so everything runs smoothly. Good time management means the organiser can go to different people instead of focusing on one person and making sure everyone is on track and not just focus on one person that’s working behind. Problem solving – It is important that the event planner has the ability to solve problems that may occur and may not be planned such as at the world cup a referee being ill this can easily be avoided by the getting a back up referee which is either the four official or sometimes the fifth so they can swap for the ref. Failure to have either of these can result in the game being cancelled or abandoned which will lose money to their economy and also it may cause problems for the travelling fans because they may have booked a flight when the game is next to be rescheduled . So it is important that the planner is ready to prepare for the worse and has ways of avoiding the situation. Negotiating- To keep within the events budget the organiser will be forced to negotiate to keep within the budget, so for the world cup he would of have to of negotiated with contractors and builders and manual labourers, the organiser would of tried to get the lowest price possible to get the stadium built to a high standard and as quick as they can. Negotiating for event organiser is vital to keep within budgets and saves the buyers money which would make the organiser highly recommendable to other people seeking a event organiser. Planning – The event planner will have to be able to plan long, short and medium situations for example a long term plan is planning where the stadiums are going to be built and how large of a capacity it is going to be, this will take a long time to both think about and also it will take even longer to execute an example of a medium term planning is things like what referees will be appointed to which games and also when the games will take place and at what times they kick off and finally short term would be what food and drinks are  too be sold. An event organiser has to be able to plan all three types and manage the time between planning them efficiently. Resource management- The event planner must make sure that there is enough food and drink for each and every stadium for each game failure to do so will cause the fans to grow inpatient and will prevent buying products I future games and may bring their own food which would lose money. Also they need to make sure that there’s not only enough food and drink but that there’s a wide range of options to chose from so the customers are kept happy by the wide selection of service. Monitoring- Because an event planner can’t do all the jobs they have to be able to keep monitoring and checking up on the people who are doing the more complex and longer jobs to make sure that they’re keeping up and schedule and not slowing anything down. They also have to be very supportive to try and motivate the workers to try and finish early. Evaluating- The event planner has to have a bench mark so that he can see if the job has been done below or above expectation, this is so the person can readjust things if they are up to the standards which they have without a good evaluation the jobs could be done below par and thus upsetting customers which aren’t getting the service which they have paid to get

The Effects of Domestic Violence - 1831 Words

Domestic Violence What effects does domestic violence have on the victim and their families? Domestic violence has a tremendous effect on people lives. It is a terrible crime and is happening each day. It is said that every 9 seconds a women is assaulted or beaten. Domestic violence is the leading cause of injury in women. This crime is very common and happens to people that you may even know. â€Å"Domestic violence is a pattern of abusive and threatening behaviors that may include physical, emotional, economic, and sexual violence as well as intimidation, isolation, and coercion. The purpose of domestic violence is to establish and exert power and control over another; men most often use it against their intimate partners, such as current or former spouses, girlfriends, or dating partners. Domestic violence is often not paid much attention. People tend to look over it and keep moving. Even the victims of domestic violence tend to keep them to their selves. They are afraid to leave their abusers so they stay quiet and refuse to tell anyone about what is happening. Some don’t even think of themselves as abused. People that are close to the situation also overlook it. Family members fail to recognize that someone close to them is getting abused. Domestic violence is a behavior that is learned through observation and reinforcement in both the family and societyâ₠¬ . Many of the abusers feel that men have power over women and have the right to use force to ensure that control.Show MoreRelatedThe Effects Of Violence On Domestic Violence1380 Words   |  6 Pagesobject to violence, because when it appears to do good, the good is only temporary; the evil it does is permanent†, quoted by Mahatma Gandhi. Violence is defined as an unjust or unwarranted exertion of power or force to intentionally injure, damage, or destroy something or someone. 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Beer Classification Paper - 1144 Words

The history of beer dates back hundreds of years prior to written history. Besides water and tea, beer is one of the most-frequently consumed beverages in the world. Contrary to popular belief, that all beers are typically the same, there are many variances in color, flavor, strength, production method, ingredients and origin. Beer can be divided into 2 broad sub-categories: ale and lager. Ales were the first type of beer ever created before brewers knew the role yeast played during the beer making process. Ale yeasts flocculate at the top of the fermentation tank and are brewed from malted barley using a warm fermentation. The yeast ferments the beer quickly, which gives it a full bodied and fruity taste. They also contain hops, which†¦show more content†¦Something else that adds to the taste of a beer, are additional ingredients. The last major difference between ales and lagers are there supplementary ingredients. 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This paper will compare in detail the history, economy, culture and tourism of Napa Valley, California and Bordeaux, France. Napa Valley now contains around 45,5000 acres of vineyards, and these vineyards have 33 different soil types which contribute to theRead More Cyberpunk Definitional Paper1076 Words   |  5 PagesCyberpunk Definitional Paper In the late 1970s and early 80s and new type of writing style came about that relied on many of the traditional criteria to be called science fiction, but had a certain something else that had many people agreeing that it was not just science fiction. This new style of writing was so different and so many people started writing in this style that the general public decided that it was time this genre of writing deserved a label: cyberpunk. Cyberpunk is not anRead MoreEssay on Red Hot Chili Peppers1622 Words   |  7 Pagesmany people in Central America. In this country, chili peppers were once only found in specialized ethnic stores, but now it is just as likely to be found at the neighborhood Kroger. For most people, however, their knowledge stops here. Through this paper I hope to educate the reader on some other aspects of this intriguing vegetable, such as its history, chemistry, and uses. There is some confusion over what a chili pepper is. To many it is only the hot varieties of pepper, such as the jalapenoRead MoreThe Government Doesn t Care About Wounded Veterans1611 Words   |  7 PagesDaniel Wurtz Professor Davis English 102 Final Paper 5/11/15 The Government Doesn’t Care About Wounded Veterans Veterans make up seven percent of the American population, but they account for twenty percent of its suicides. Yes, that is indeed a real statistic, more importantly, what is the government, the people that ordered those men and women deliberately into harm’s way, doing about this tragedy. In light of recent conflicts the United States has been engaging in, such as the conflicts in the