Physics Atomic Force Microscopy - 1429 Words

ATOMIC FORCE MICROSCOPY 1. Introduction to Atomic Force Microscopy An atomic force microscope (AFM) is a type of scanning probe microscope (SPM). An AFM uses a cantilever with a probe to scan over a sample’s surface. The probe is a sharp tip (3 to 6 ï  ­m pyramid; 15 to 40 nm end radius) such as the one shown in Fig. 1. As the tip of the AFM approaches the surface, at close range, attractive forces between the sample surface and the tip of the AFM causes the cantilever to deflect towards the surface. As the cantilever moves close to the surface, when the tip tends to make contact with it, increasingly repulsive forces take over and causes the cantilever to deflect away from the surface. A laser beam is used to detect cantilever movements towards or away from the surface. The laser beam is reflected back from the cantilever to a position-sensitive photo diode (PSPD). The deflections due to the interaction between the tip and the sample’s surface causes slight changes in the angle with which the laser beam reflects off the cantilever as shown in Fig. 2. This change in the angle of reflected beam is detected by the PSPD. Thus, if the tip passes over a depression on the sample, the resulting deflection of the cantilever causes a change in the angle and direction at which the laser beam reflects f rom the cantilever to the PSPD. AFM uses a feedback loop to continuously control the position of the tip (Fig. 3). By controlling the tip, an accurate surface imaging and topographicShow MoreRelatedThe Physics Of Atomic Force Microscopy1259 Words   |  6 Pages Abstract Atomic Force Microscopy was the method used to analyze samples inorder to identify their surface composition and determine their top structure. Compiled data was used to calculate the roughness of the sample. Introduction Atomic Force Microscopy is a powerful tool used to identify the surface structure of a solid by contouring the top layer with a sharp tipped probe and amplifying the hills and troughs viaRead MoreCopper Iron Alloy Of Different Thickness By Electrodeposition Technique1153 Words   |  5 Pagesproject, I fabricated thin films of cobalt iron alloy of different thickness by electrodeposition technique and studied the domain and dynamics of the domain walls by taking measurements from magnetic force microscopy (MFM). I measured the roughness by taking measurements from Atomic force microscopy. I characterized the films with XRD which showed the crystal structure of the film. The SEM images of Cobalt iron film exhibited nano crystallized structure and the variation of granular size as a functionRead MoreStructural And Electrical Properties Of Pva Ag Nanocomposite Films1738 Words   |  7 PagesEl-Kader *, Physics Department, Faculty of Science, Suez Canal University, Ismailia, Egypt ABSTRACT In the present work, PVA-Ag nanocomposite films with thickness 0.18 mm, constant silver content (0.4 wt. %) and with different time of reaction (0.1, 3, 5, 7, 9 h) were prepared by chemical reduction method. Structure, surface topology, photoluminescence and electrical properties of PVA-Ag nanocomposite were studied using x-ray diffraction (XRD), electrometer, atomic force microscope (AFM)Read MoreUsing Graphene And Its Effects On The Environment2317 Words   |  10 Pages CHAPTER-3: Properties2.1. Form and structure Delocalized electrons in favor of the network. Whether it is freely suspended graphene has the inherent ripples or not been resolved Monte Carlo simulations [ and transmission electron microscopy study. The microscopic corrugations is estimated as having a transverse size of about 8-10 nm displacement height from 0.7 to 1 nm approximately. Height stacked SiO2 - subnanometer fluctuations platelet ketone graphene on a silicon substrate byRead MoreStructure, Photoluminescence And Electrical Properties Of Pva Ag2311 Words   |  10 PagesAbd El-Kader *, Physics Department, Faculty of Science, Suez Canal University, Ismailia, Egypt ABSTRACT In the present work, PVA-Ag nanocomposite films with thickness 0.18 mm, constant silver content (0.4 wt. %) and different time of reactions (0.1, 3, 5, 7, 9 h) were prepared by chemical reduction methods. Structure, surface topology, photoluminescence and electrical properties of PVA-Ag nanocomposite were studied using x-ray diffraction (XRD), electrometer, atomic force microscope (AFM)Read MoreEnhancement Of Optical And Electrical Studies On Pva Ag Nanocomposite Films2347 Words   |  10 Pages xxxxxxxxxxx Physics Department, Faculty of Science, Suez Canal University, Ismailia, Egypt ABSTRACT In the present work, PVA-Ag nanocomposite films with thickness 0.18 mm, constant silver content (0.4 wt. %) and different time of reactions (0.1, 3, 5, 7, 9 h) were prepared by chemical reduction methods. Surface topology, optical and electrical properties of PVA-Ag nanocomposite were studied using absorption spectroscopy, electrometer, atomic force microscope (AFM) and photoluminescenceRead MoreEffects Of Point And Line Defects On The Properties Of Graphene9719 Words   |  39 Pagesare inevitable at the time of production can alter the structural properties of any engineering materials. Developing graphene with specific structural properties depends upon controlling these defects, either by removing or deliberately engineering atomic structure to gain or tailoring specific properties. In the present article, a comprehensive review of defective graphene sheets with respect to its mechanical and thermal properties are presented and examined. Key Words: Graphene; point defects; lineRead MoreThe Theory Of Graphene On Science And Future Electronic Technology1905 Words   |  8 Pagesgraphene held together through weak Van der Waals forces.6 â€Å"Few-layer graphene† (very thin films of graphite, called FLG) was produced as early as 1948 by G. Ruess and F. Vogt7 but single-layer graphene, a single carbon atom thick, was not isolated successfully until 2004 at the University of Manchester by Andre Geim and Kostya Novoselov.1 Their work was published in the highly influential journal Science, and was subsequently awarded the Nobel Prize in Physics in 2010, for â€Å"ground-breaking experiments regardingRead MoreThe Effect Of Carbon Nanotubes On Other Fields Of Materials Science2155 Words   |  9 Pagesof sp2 bonds, like the ones seen in graphite. This bonding structure, stronger than the sp3 bonds found in diamond, provides the molecules with their unique strength. Nanotubes naturally align themselves into ropes hel d together by Van der Waals forces. Under high pressure, nanotubes can merge together, trading some sp2 bonds for sp3 bonds, thus acquiring great possibility for producing strong, unlimited-length wires through high-pressure nanotube linking. Carbon nanotubes (CNTs) are allotropesRead MoreCase Study on Future Scope of Nanorobotics in Medical Field3531 Words   |  15 PagesTechnology Management, Bhilwara 1 ABSTRACT Nanorobotics, just as with all nanotechnology is still in very early stages of development and as such is largely based within electronic engineering and physics and concerns micromachining, microelectromechanical systems (MEMS)and Scanning Probe Microscopy methods. Research into any particular method for creation of nanorobots will largely depend on the group carrying out the research rather than the subject within which they are based. For instance, IBM

Graduation Speech My Experience - 1594 Words

This class, UWP 104FY, has lead me to realize the areas I struggle in and how I overcame those struggles. When I entered this class, I lacked practice with writing and was unable to adjust my habits to accommodate the flow of this course. I had not written an essay, except for research papers, since my fall quarter of freshman year. It was especially hard for me to adjust my time to account for all the activities in the class. Since the course is a hybrid course, I only had one face-to-face meeting with the class. Half of the class requires self-pace and constant checking of what needed to be accomplished. With my initial abilities, I was unable to excel in the course. However, as the course progressed, I was able to change some of my†¦show more content†¦As I learn about myself more throughout the course, I became more curious about the things I write about. I had originally accepted things as they are because following is much simpler and easier to do, but as the course pr ogressed, I became more curious and frequently generated new ideas to incorporate into my writing. When I first started the Annotated Bibliography, the course reader was a great help in outlining a template to follow. The Annotated Bibliography doesn’t require too much thinking, so I merely followed what needed to be done. The Annotated Bibliography still required knowledge of the general topics I would like to summarize. The summary themselves did not require me to be creative, but the brief assessment of the entries’ usefulness did. The assessment allowed me to connect ideas that I never thought would come together. It was very interesting to make these connections, and I started to generate more ideas about how I can incorporate these for the Literature Review. However, I did not use these ideas for my Literature Review because I restricted my topic more towards a specific research question. The Literature Review allowed me to general new ideas. Reading those articl es I have chosen offered me a variety of options to let my ideas flow and integrate with each other. Synthesis of these literature requires curiosity and the ability to generate new ideas. I struggled with synthesizing the materials, but I enjoyed makingShow MoreRelatedGraduation Speech : My Experience880 Words   |  4 Pagesinto the class and what my thoughts were. I was very excited to be taking the class and I was very curious as to what the course would be like. Prior to this class my entire coursework have been online and this is the first time in some time that I was on campus so I was really ready for that in class interaction. I can remember telling my mentors and my Godly counsel that I was taking multicultural counseling and they were very excited about the work of the Lord they see in my life. I was also worriedRead MoreGraduation Speech : My Experience Essay1735 Words   |  7 PagesGraduation The long buildup to one of my happiest experiences began many years ago, when I first started school. This experience isn’t just one single event that occurred in the span of a day, but a transition that took place over a few months. Even on my very first day of kindergarten, it was already clear to me that going to school wasn’t going to be something that I enjoyed. I was very shy and withdrawn, and the other kids weren’t at all interested in being friends with me. Despite my effortsRead MoreGraduation Speech : My Experience957 Words   |  4 PagesI can remember a presentation I gave to my school when I was in grade 4. Students were nominated by their teachers from grade 4 to grade 6 and the students were asked to give a speech on a particular question. I believe it was my first big presentation, so I made sure I practiced many times at home in front of my parents and on my own in front of a mirror as well. When it came time for me to present, I forgot all th e words to my presentation. I remember feeling embarrassed, but also disappointedRead MoreGraduation Speech : My Experience877 Words   |  4 PagesMy experience in education from kindergarten to being a senior in high school was very challenging but rewarding. Throughout my schooling, I was blessed to have some exceptional teachers and coaches that had taught me life lessons and challenged me to be a better person outside the classroom and a better student in the classroom. From kindergarten to being a senior in high school, I attended three different types of schools in the South Carolina School system. I attended a small private ChristianRead MoreGraduation Speech : My Experience913 Words   |  4 Pagesof spending the summer abroad in Hong Kong through UCLA for my college classes. From the beginning, I knew that my goal of this summer abroad was to understand how to work with a culture very different than my own. I would be lying if I stated that I wasn’t a challenge to adjust, but with my patience, understanding, and my desire to succeed, I eventually prevailed. I pushed through my fear of not doing well enough and decided to try my best. The skills I learned in communicating with people whomRead MoreGraduation Speech : My Experience Essay1654 Words   |  7 PagesThe long, gloomy buildup to my joyful experience began many years ago, when I first started school. Even on my very first day of kindergarten, it was already clear to me that going to school wasn’t going to be something that I enjoyed. I was very shy and withdrawn, and the other kids weren’t at all interested in being friends with me. Despite my efforts to try and fit in, they never seemed to like me as much as they all liked each other, The kids in my class didn’t see my quiet nature as shyness, butRead MoreGraduation Speech : My Experience Essay1873 Words   |  8 Pagesworst classes throughout my school years. In all of my English classes, I was always behind n o matter how hard I tried to catch up and stay ahead. As I grew up I was always worried about what we would be doing in English even if it was just going over a story and digging into it; I always made myself more nervous than I needed to be. Going through many different English classes to try to get to graduation was the only way I could get through. Based on previous academic experiences, reflecting back onRead MoreGraduation Speech : My Educational Experience915 Words   |  4 Pages My educational experience is just now beginning as of now I am taking an English class also over summer I took an online academic skills class. Although online classes don’t do college justice you don’t really get the full college experience. As of now I am just focusing on my general education then eventually I hope to attend an RN program. So as of my educational experience this far would be high school and as Dweck author of Brainology would say I had a fixed mindset during high sch ool even duringRead MoreGraduation Speech : My First Experience905 Words   |  4 PagesIn my twenty nine years of life I have met every type of teacher. I remember when I was in kindergarten having a strict teacher that never let anything slip by. When I was in fifth grade I learned what it was to have no extra help, I repeated fifth grade. The one type of teacher I will never forget is my Junior year social studies teacher, she encouraged me throughout that year to be the best at everything I did in school. You will have these type of teachers throughout your life, the strict teacherRead MoreGraduation Speech : My Personal Experience909 Words   |  4 Pageslearn from their mistake because my parents gave me the opportunity to fail and later on in life I achieved success from my fail and my personal experience as well as sherry connects with how failure improved education. For example in her essay, â€Å" In Praise of the F word†, she states how countless students do not have the skills they need to succeed and how diplomas for students don’t value anything. Furthermore, she in the essay it also give a personal experiences about her son and h ow she as a parent

What Extent Can Racism Be Prevented in Society Free Essays

To what extent do you think racism can be prevented in society? Racism has long been a critical issue in our society and while many measures have been taken to prevent racism, it is a controversial issue as to whether racism can really be eliminated. Many are confident that racism can be prevented, while others are not as convinced. Hence, my topic for this essay is to discuss the extent to which racism can be prevented. We will write a custom essay sample on What Extent Can Racism Be Prevented in Society or any similar topic only for you Order Now Perception is the ability to see, hear, or become aware of something through our senses. It’s a way of regarding, understanding and interpreting something. However while perception is an unavoidable part of our life, it has also been said to encourage racism. It is said to encourage racism through two aspects; visual and auditory perception. Firstly, visual perception is our ability to see while auditory perception is our ability to hear. Both are natural abilities that we are born with and we use them on a daily basis but yet, it can be a dangerous tool. For example, when people see a â€Å"black† person, they may immediately respond by thinking that they are inferior, because society has influenced them to think that way. Similarly, when people hear someone with an African accent, that person can be subjected to racism because we have been influenced to think that Africans are an inferior race. In both cases, visual and auditory perception has aided in us to be racist! Another issue is that to stop racism, we first must identify what is classified to be racist and what isn’t but how do we even begin to measure the severity of racist comments? For example, in the article, John Terry was accused for racist abuse against Ferdinand. While many believes that Terry is guilty of being racist, there also others that argues that Terry did not mean what he said as an insult but rather as a challenge to what he believed had been said to him. The chief magistrate believed that Terry was only repeating the words that he believed Ferdinand had accused him of saying. How do we judge what is considered to be racist and what isn’t? How do we begin to measure what is a â€Å"severe† racist comment and what can be let off? If someone only said racist comments to defend themselves because another erson is attacking them verbally, should they be let off? Lastly, who has the â€Å"power† to decide whether something is classified as racist or not? However, on another note, there is a number of ways that racism can be eliminated in our society. A lot of measures have been taken to prevent racism and many campaigns and petitions have been set up to challenge racism. This has resulted in increased awareness on th e important issue of racism and society has really opened their eyes and started to think before they speak. Many people have become more careful when choosing their words to ensure that they do not offend anyone. Racist comments are so regarded with contempt that people who engage in racism are often criticized severely by society and these people can even be imprisoned. Thus, this measure has also resulted in a decrease in racist cases in our society. However, in my opinion, while racist cases have decreased dramatically, I do not think that racism can ever be eliminated completely in society. Firstly, even though people who engage in racism can be imprisoned, this does not necessarily stop people from engaging in racism when they are alone or when they are with their close friends who share the same views as them. Furthermore, children who grow up in families that engage in racism will influence them to think that racism is okay and it is extremely difficult to change their way of thinking as its our word against their family’s. Due to the increased advancement of technology, it is also very easy for people to post racist comments anonymously, resulting in a whole new way of engaging in racism that is difficult to stop. Thus, I do not believe that racism can be eliminated entirely, but I do believe that racism is a very serious issue and we should all play a part to try and decrease the number of racist cases in society. We should always do what we want others to do unto us, and I am sure that none of us would want to be judged based on our race. Most importantly, we should all play our individual role and to think twice before we speak and to understand that our tongue is a sharp tool, and what we say can affect someone’s life in ways that we do not understand. How to cite What Extent Can Racism Be Prevented in Society, Papers

What Extent Can Racism Be Prevented in Society Free Essays

To what extent do you think racism can be prevented in society? Racism has long been a critical issue in our society and while many measures have been taken to prevent racism, it is a controversial issue as to whether racism can really be eliminated. Many are confident that racism can be prevented, while others are not as convinced. Hence, my topic for this essay is to discuss the extent to which racism can be prevented. We will write a custom essay sample on What Extent Can Racism Be Prevented in Society or any similar topic only for you Order Now Perception is the ability to see, hear, or become aware of something through our senses. It’s a way of regarding, understanding and interpreting something. However while perception is an unavoidable part of our life, it has also been said to encourage racism. It is said to encourage racism through two aspects; visual and auditory perception. Firstly, visual perception is our ability to see while auditory perception is our ability to hear. Both are natural abilities that we are born with and we use them on a daily basis but yet, it can be a dangerous tool. For example, when people see a â€Å"black† person, they may immediately respond by thinking that they are inferior, because society has influenced them to think that way. Similarly, when people hear someone with an African accent, that person can be subjected to racism because we have been influenced to think that Africans are an inferior race. In both cases, visual and auditory perception has aided in us to be racist! Another issue is that to stop racism, we first must identify what is classified to be racist and what isn’t but how do we even begin to measure the severity of racist comments? For example, in the article, John Terry was accused for racist abuse against Ferdinand. While many believes that Terry is guilty of being racist, there also others that argues that Terry did not mean what he said as an insult but rather as a challenge to what he believed had been said to him. The chief magistrate believed that Terry was only repeating the words that he believed Ferdinand had accused him of saying. How do we judge what is considered to be racist and what isn’t? How do we begin to measure what is a â€Å"severe† racist comment and what can be let off? If someone only said racist comments to defend themselves because another erson is attacking them verbally, should they be let off? Lastly, who has the â€Å"power† to decide whether something is classified as racist or not? However, on another note, there is a number of ways that racism can be eliminated in our society. A lot of measures have been taken to prevent racism and many campaigns and petitions have been set up to challenge racism. This has resulted in increased awareness on th e important issue of racism and society has really opened their eyes and started to think before they speak. Many people have become more careful when choosing their words to ensure that they do not offend anyone. Racist comments are so regarded with contempt that people who engage in racism are often criticized severely by society and these people can even be imprisoned. Thus, this measure has also resulted in a decrease in racist cases in our society. However, in my opinion, while racist cases have decreased dramatically, I do not think that racism can ever be eliminated completely in society. Firstly, even though people who engage in racism can be imprisoned, this does not necessarily stop people from engaging in racism when they are alone or when they are with their close friends who share the same views as them. Furthermore, children who grow up in families that engage in racism will influence them to think that racism is okay and it is extremely difficult to change their way of thinking as its our word against their family’s. Due to the increased advancement of technology, it is also very easy for people to post racist comments anonymously, resulting in a whole new way of engaging in racism that is difficult to stop. Thus, I do not believe that racism can be eliminated entirely, but I do believe that racism is a very serious issue and we should all play a part to try and decrease the number of racist cases in society. We should always do what we want others to do unto us, and I am sure that none of us would want to be judged based on our race. Most importantly, we should all play our individual role and to think twice before we speak and to understand that our tongue is a sharp tool, and what we say can affect someone’s life in ways that we do not understand. How to cite What Extent Can Racism Be Prevented in Society, Papers