Experimental Investigations of Catalytic Effect of Cu2+

Experimental Investigations of Catalytic Effect of Cu2+ Experimental Investigations of Catalytic Effect of Cu2+ During Anodic Disolution of Iron in NaCl Electrolyte R.K Upadhyay1, Arbind Kumar2 and P.K Srivastava3 Abstract: Taguchi’s orthogonal array L9 has been effectively used to study the effect of process parameters such as voltage, feed rate and electrolyte concentration on material removal rate in context of two different types of electrolyte namely aqueous NaCl solution and electrolyte solution containing Cu2+ ions. The results indicated that Cu2+ has a catalytic effect on the anodic dissolution of iron, which restrict the oxidation of Fe2+ to Fe3+ and increases the dissolution rate during machining. The experimental results were analyzed using analysis of variance (ANOVA) method to investigate the significance and percentage contribution of individual process parameters on performance characteristics. Key Words: Electrochemical Machining, Aqueous NaCl, Cu2+, Parameters, Oxidation, Material Removal rate. Introduction: Electrochemical machining (ECM) has got an industrial importance due to its capability of controlled atomic level metal removal1. It is an anodic dissolution  process based on electrolysis, where the application of a more traditional process is not convenient. ECM has been successfully employed in aerospace, automobile industries and now gaining much importance in the electronics and other high-tech industries for the fabrication of micro components2-3. Mask less and through mask electrochemical micromachining techniques have been successively used thin films and foils of materials those are difficult to machine by other methods4-5. Electrochemical machining is low voltage (5-25 volt) machining process which offers high metal removal rate and also capable to machine hard conductive materials into complicated profiles without any thermal damages thus suitable for mass production work with low labor requirements6-7. The dissolution rate is highly reliant on the selection of electroly tes and its current carrying capacity. On increasing the concentration of electrolyte solution dissolution rate also increases but excess concentration allows the crystal formation, which may damage the accessories of ECM and reduce the volume of electrolyte in flow pipes. The conductivity of electrolyte depends not only on the concentration but also on ionic interaction. Thus, the current carrying process done by the base electrolyte is small, but H+ and OH ions produced in electrolysis of water play important role8-9. The achievement of higher dissolution rate in ECM is a strong research base which is possible by change in composition of electrolyte solution to promote catalytic effect during dissolution10. During electrochemical machining of iron at low current density it has been observed that Fe+ cation formed very easily but it is highly unstable and immediately oxidizes into Fe2+ state. Increase in current density leads to simultaneous production of Fe2+ and Fe3+, at higher current density apparent valence of iron increases above three11. Therefore, to stabilized Fe2+ in the aqueous solution is a challenge during dissolution. EXPERIMENTAL SET-UP AND PRINCIPLE OF ECM: Fig 1 Experimental set-up ECM is an anodic dissolution process works on the principle of Faradays law. While machining of iron in presence of aqueous NaCl electrolyte solution the following chemical reactions are observed12. Reactions at Cathode: Na+ + e à ¯Ã†â€™Ã‚ ³ Na Na + H2O à ¯Ã†â€™Ã‚ ³ NaOH + H+ 2H+ + 2e à ¯Ã†â€™Ã‚ ³ H2 It shows that only hydrogen gas will evolve at cathode. When pure iron is being machined electrochemically the following reactions would occur13-14. Fe à ¯Ã†â€™Ã‚ ³ Fe2++ 2e Fe2+ + 2Cl à ¯Ã†â€™Ã‚ ³ FeCl2 Fe2+ + 2(OH) à ¯Ã†â€™Ã‚ ³ Fe(OH)2 FeCl2 + 2(OH) à ¯Ã†â€™Ã‚ ³ Fe(OH)2 + 2Cl 2Cl Cl2 + 2e 2FeCl2 + Cl2 à ¯Ã†â€™Ã‚ ³ 2FeCl3 H+ + Cl à ¯Ã†â€™Ã‚ ³ HCl 2Fe(OH)2 + H2O +O2 à ¯Ã†â€™Ã‚ ³ 2Fe(OH)3 Fe(OH)3 + 3HCl à ¯Ã†â€™Ã‚ ³ FeCl3+ 3H2O FeCl3+ 3NaOH à ¯Ã†â€™Ã‚ ³ Fe(OH)3 + 3NaCl It shows that during electrochemical machining of iron in NaCl electrolyte, iron is removed as Fe(OH)2 and precipitated as sludge while sodium chloride is recovered back. Due to further reaction, formation of Fe(OH)3 is also possible Which, confirms the existence of iron in +2 and +3 states during dissolution. Determination of Fe2+ and Fe3+ ions in electrolyte solution: The electrolyte solution containing Fe+2 and Fe+3 ions was collected. Fe+2 ions were determined directly by titrating a known volume of iron electrolyte solution with K2Cr2 O7 in acidic medium (HCl). Cr2O7 2- + 6Fe+2 + 14H+ = 2Cr+3 + 6Fe +3 + 7H2O Internal indicator N- phenyl anthranilic acid was used to mark the end point. Fe+3 ions were determined after all the Fe+3 ions are reduced into Fe+2 ions with SnCl2 in presence HCl in hot. Sn+2 + 2Fe +3 = Sn+4 + 2Fe+2 The solution was then cooled and excess SnCl2 was removed by adding HgCl2 solution. 2Hg+2 + Sn+2 +Cl = Sn+4 +Hg2Cl2 (white ppt) Titration of known volume of standard solution was done using standard solution of K2Cr2O7 in acidic medium. From the volume of K2Cr2O7 used, the total amount of Fe+2 and Fe+3 ions was determined. The amount of Fe+3 ion was determined by subtracting amount of Fe+2 which is determined earlier. Material removal rate during electrochemical machining is greatly influenced by dissolution valence. As the dissolution valence decreases MRR increases. In this paper an approach is made to enhance the electrochemical dissolution of iron through control of valency (transition) therefore, in this direction, use of electrolyte solution containing Cu2+ is suggested. The dissolution limit of iron by Cu2+ ions can be is justified by considering the standard electron potential E ° for Cu2+, Fe/Fe2+and Fe/Fe3+ described as follows15. Cu2+ + 2e- Cu E ° = +0.34V Fe2+ + 2e- Fe E ° = -0.44V Fe3+ + e- Fe2+ E ° = +0.77V As E ° for Cu2+ Cu is more positive than Fe2+ Fe, Cu2 +will oxidize Fe to Fe2+. However, as E ° for Cu2+ Cu is less positive than Fe3+ Fe2+, Cu2+ will not oxidize Fe2+ to Fe3+. Making electrolyte solution: 250 gramsof NaCl was mixed with400 gramsof CuSO4 in10 litersof water. The mixture is stirred well for 2 minutes then heated until it loses its green color. The crystals of sodium sulphate (Na2SO4) and copper chloride (CuCl2) were removed by filtering the solution and thi the solution thus obtained was saturated solution of Na2SO4 containing Cu2+ ions which participates in anodic dissolution process. MACHINING CONDITIONS: Following machining parameters are selected on the basis of performance characteristics, Table1: Machining conditions for analysis SELECTION OF MACHINING PROCESS PARAMETERS Table 2 shows machining parameters and selected levels for experimental procedure Table 2: Process parameter and their levels Measurement of MRR The initial weight of the work piece was taken for calculation of MRR. Keeping the flow rate constant at 15 lit/min and the rest of the parameters are set according to table 1 for each run. Work piece was kept horizontal, and cylindrical electrode was used for machining. Gap between tool and workpiece was maintained carefully to avoid the choking. The electrode was fed continuously towards the work piece during machining and time was recorded. After machining, the cavity was formed on the work-piece. The final weight of the work-piece was taken and material removal rate was calculated as per the following formula: MRR= †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦. (1) EXPERIMENTAL PROCEDURE: The design resulted in total of eighteen experiments, which are performed at 10V-18V supply voltage, 10-30 g/lit electrolyte concentration and 0.0001-0.0005 cm/sec feed rate as the values for the control variables. The responses measured are Material removal rate (MRR) Scheme of the experiments is as shown in Table 3. Table 3: Taguchi L9 OA for MRR RESULTS AND DISCUSSION Analysis of Variance (ANOVA) when machinating in presence of NaCl electrolyte solution: Percentage contribution of each parameter on material removal rate during electrochemical machining of iron in aqueous NaCl electrolyte solution is shown in table 4 and represented graphically in figure 2. Table 4: ANOVA for MRR [NaCl as electrolyte] Fig 2. Contributions of the parameters when machining in presence of aqueous NaCl electrolyte solution Regression Equation: MRR= -0.01096 +0.002296Voltage +64.0FeedRate +0.000540Concentration. †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦(2) The equation (2) shows that Feed rate is dominant factor affecting MRR. The graphs shown in figure 3 are plotted from the regression equation (2). Fig 3. Main Effects Plot for SN ratios (NaCl electrolyte solution) Figure shows the main effect plot of the MRR depicting the effect of various machining parameters on MRR. As seen from the plot obtained, the MRR increased with increase in both voltage and feed rate. This is due to the fact that with increase in voltage the current increases in the inter electrode gap thus increasing the MRR. Feed rate is another important parameter. Increase in feed rate results in decrease of the conducting path between the workpiece and the tool hence resulting in high current density thus enhancing the rapid anodic dissolution. An overall increase in the MRR was also observed with increase in the concentration as the larger number of ions associated with the machining process which increases the machining current and thus results in higher MRR. Effects of selected process variables (i.e. Voltage, Feed rate and Concentration) on material removal rate (MRR) at different sets of conditions while machining in presence of aqueous NaCl solution are shown in figure 4(a), 4(b) and 4(c). Fig. 4(a) Effects of Voltage on material Fig. 4(b) Effects of Feed rate on material removal for different Concentration, removal for different Voltage, Feed rate= 0.0001 cm/sec. Concentration = 20 g/lit. Fig.4(c) Effects of Concentration on material removal for different Feed rates, Voltage= 14 V NaCl electrolyte tend to promote the oxidation of Fe2+ to Fe3+ during the dissolution process the maximum MRR obtained during machining of iron in aqueous NaCl solution recorded was 0.0653 cm3/sec. Although the higher concentration of NaCl is favorable for better MRR but excess concentration allows the crystal formation which reduces the volume of electrolyte in flow pipes and also affects the dissolution rate. Analysis of variance when machining in presence of electrolyte solution containing Cu2+ ions Percentage contribution of each parameter on material removal rate during electrochemical machining of iron in electrolyte solution containing Cu2+ ions is shown in table 5 and represented graphically in figure 5. Table 5 ANOVA for MRR [electrolyte solution containing Cu2+ ions] Fig 5. Contributions of the parameters when machining in presence of electrolyte solution containing Cu2+ ions Regression Equation: MRR = -0.0157 +0.002908Voltage +75.3FeedRate +0.000602Concentration. .†¦Ã¢â‚¬ ¦. (3) The equation (3) shows that voltage is dominant factor affecting MRR. The graphs shown in figure 6 are plotted from the regression equation (3). Fig 6. Main Effects Plot for SN ratios (electrolyte solution containing Cu2+ ions) The oxidation of Fe2+ in to Fe3+ is restricted due to the presence of Cu2+ in electrolyte solution which promotes the higher dissolution rate during machining. The influence of selected process variables i.e. Voltage, Feed rate and Concentration on material removal rate at different sets of conditions in presence of electrolyte solution containing Cu2+ ions are shown in figure 7(a), 7(b) and 7(c) respectively. Fig. 7(a) Effects of Voltage on material Fig. 7(b) Effects of Feed rate on material removal for different Concentration, removal for different Voltage, Feed rate= 0.0001 cm/sec. Concentration = 20 g/lit. Fig. 7(c) Effects of Concentration on material removal for different Feed rates, Voltage= 14 V. The maximum MRR obtained during machining of iron in presence of Cu2 electrolyte solution containing Cu2+ ions was 0.0774 cm3/sec, which is 18.5% more when compared with aqueous NaCl electrolyte. CONCLUSION The electrochemical characteristics of iron in aqueous NaCl solution and electrolyte solution containing Cu2+ ions has been analyzed experimentally to investigate the influence of process parameters on MRR. The Process parameters such as voltage, feed rate, Electrolyte concentration, were successfully controlled. The different combinations of these parameters were used for the experimentation in order to determine their influence on MRR. The experiment was performed by varying all parameters in combination as per L9 orthogonal array. The experimental observations support the conclusion that the presence of Cu2+ ions in electrolyte solution restrict the further oxidation of Fe2+ to Fe3+ and enhance the low valence dissolution of iron during machining. Design of experiments and analysis of variance helped in identifying the significant parameters affecting MRR. The best combination of the parameters are Voltage= 18 V, Feed Rate=0.0005 cm/sec and electrolyte Concentration = 20 g/lit whe n using a solution containing Cu2+ ions as electrolyte. The maximum MRR obtained was 18.5 % higher when compared with aqueous NaCl electrolyte for the same set of working conditions. Acknowledgement: I express my sincere thanks to Department of Applied Chemistry BIT Extension Centre Deoghar for their cooperation to conduct the experiments in order to observe the catalytic behavior of Cu2+ ions. References: 1.Sekar T, Marappan R. Experimental investigations into the influencing parameters of electrochemical machining of AISI 202. Journal of Advanced Manufacturing Systems 2008; 7(2):337-43. 2.Bhattacharyya B, Munda J. Experimental investigation on the influence of Electrochemical machining parameters on machining rate and accuracy in micromachining domain. Int J Mach Tools Manuf 2003; 43(13):1301-10. 3. Kozak J, Rajurkar KP, Makkar Y, Selected problems of microelectrochemical machining Journal of Materials Processing Technology 2004; 149: 426– 431. 4. Bhattacharya B, Doloi B and Sridhar PJ. Electrochemical Micromachining: New possibilities for Micro- Manufacturing. J. Material. Proc.Tech 2001;113:301-305. 5. Bhattacharyya B, Malapati M, Munda J, Sarkar A. Influence of tool vibration on Machining performance in electrochemical micro-machining of copper International Journal of Machine Tool and Manufacture 2007; 47: 335–342. 6.Hocheng H, Sun YH, Lin SC, Kao PS. A material removal analysis of Electrochemical machining using flat-end cathode. Journal of Materials Processing Technology 2003; 140:264- 268. 7.Yong L, Di Zhu, Yongbin, Zeng, Shaofu Huang, Hongbing Yu. Experimental Investigation on Complex Structures Machining by Electrochemical Micromachining Technology, Chinese Journal of Aeronautics 2010; 23:578-584. 8.Mukherjee SK, Kumar S, Srivastava PK. Effect of electrolyte on current- carrying process in ECM, I Mech E Part C J. Mechanical Engineering Science 2007; 221:1415-1419. 9. Byk MV, Tkalenko DA and Tkalenko MD. On participation of hydroxide ions in the anodic dissolution of metals in aqueous electrolyte solution. Prot Met t 2004; 40(3): 294-296. 10.Ayyappan S and Sivakumar K. Investigation of electrochemical machining characteristics of 20MnCr5 alloy steel using potassium dichromate mixed aqueous NaCl electrolyte and optimization of process parameters.Proc I MechE part B Journal of Engineering Manufacture 2014. 11.Srivastava PK, Kumar R, Barhai PK. Energy Profile and Thermodynamic Feasibility of Iron(I) during Electrochemical Machining of Iron.International Journal of Mechanical Engineering 2013; 41:1146-1158. 12.Mukherjee SK, Kumar S, Srivastava PK. Effect of over voltage on material removal rate during Electrochemical Machining. Tamkand Journal of Science and Engineering 2005; 8: 23- 28. 13. Neto JC.d.S, Silva, EMd, Silva MBd. Intervening variables in electrochemical machining Journal of Materials Processing Technology 2006; 179:92–96. 14.Mount AR, Muir RN. Dissolution characteristics of iron and stainless steels in chloride under electrochemical machining conditions; Journal of the Electrochemical Society 2007;154: 3: E57; E61. 15. Electrochemistry 3: Cell potentials and thermodynamics, chemwiki.ucdavis.edu †º Analytical Chemistry †º Electrochemistry (2014, accessed 15 May 2015). Stephen K. Lower. Redox equilibria in natural waters: Chem1 Environmental Chemistry, http://www.chem1.com/acad/webtext/pdf/c3redox.pdf(1998, accessed 15 May 2015). 1

Prose Study Coursework Essay

In chapters 13 and 14 of the novel Treasure Island, through use of different literary techniques such as animal imagery, similes, metaphors, assonance and many more, Stevenson achieves a sense of foreboding as to what will happen later in the novel, dropping hints here and there. These chapters are important because the crew of the Hispaniola, including Lon John Silver and Jim Hawkins, have just landed on the island, and are about to set off in search off the buried treasure. We can even get a sense of foreboding from the island itself as it is seen to be gloomy and mysterious, and this does not bode well for the adventure ahead. We can find foreboding through the author’s use of similes and metaphors in the chapters. ‘Spires of naked rock,’ is a way of saying the rocks are very tall and imposing, as well as exposed. This is scary as just reading the exerpt creates a dark atmosphere, and it paves the way for the future of the novel. This is achieved by use of dark colours, and ‘naked’ implies that after Jim has escaped there is nowhere that he can hide, because everyone can see everything. This creates the effect on the reader of sadness, as they really feel for Jim, as he is trapped on the island with those monsters. Jim also gives away hints towards the future events of Treasure Island when he says ‘my heart sank’ when he realises what he has done in sneaking ashore with the pirates away from people he knows he can trust and this shows his disappointment. Jims downbeat mood portrays a bad effect to the reader, and they start to feel for Jim, as bad things obviously loom later in the novel, for instance, the planned mutiny of Long John Silver, and how if successful, Jim and his comrades will be doomed, and Jims capture by the pirates. The quotation ‘hung over the anchorage’ is used to create a bad air and produce fearful images in your mind. Foreboding is shown because there is obviously a bad atmosphere on board, symbolising the planned mutiny of Long John Silver, and the good hands on board are of course fretting over what to do. ‘Clouds of birds’ conveys to the reader the image of a deep mass of birds, and when there is a lot of something, especially animals that are making lots of noise, can strike fear in to people. This can give us an insight into what may happen later because birds are good at sensing danger, and quickly fly away if anything unsettles them. If they are very disturbed and are hanging over the ship, then surely the mutiny must be destined to happen, and the crew must have to face the wrath of Long John Silver. Through animal imagery we can get a sense of fear such as ‘crawling on all fours’ when Jim is near Long John Silver and he is crouching when he has run away from Silver and does not want to be seen. This shows us what may happen later in the novel because it shows Jim is scared of Long John Silver and Silver is not really a very good person, and is planning bad things later in the novel. ‘Agile as a monkey’ when used to describe Silver is showing him in a bad light, because he is deceiving everyone by hobbling around everywhere with his wooden leg, however, when he is out of view of the captain he is very quick and has lots of agility, which shows appearances can be deceptive and this confirms to us that he is planning a mutiny and other evil activities on the return leg of the journey, behind the other crew members backs. We can also get a sense of foreboding by one of the good men’s reactions when he is faced with Silver and does not to be involved in the mutiny. ‘Like a horse at the spur’ shows the unconverted crew member faced with Long John is very startled by the scream, and he immediately suspects Long John Silver and wants to get away because he knows Long John is starting the process of whittling down the numbers of good men on board to make the future mutiny much easier. Through the quotation ‘crouching trees,’ when Jim is lost in the woods, we get a sense that Jim is trapped and is enclosed by the trees which seem alive, which is a good example of personification. This creates a sense of what may happen in the future as everything so far has had a bad feeling about it, and it can only be a matter of time before something happens. ‘Would not the first of them who saw me wring my neck like a snipe’s?’ Fear is created by the rhetorical question and the use of animal imagery, and we feel a sense of sorrow for Jim’s dire situation. It gives us a premonition that later in the novel if the pirates catch Jim he will be killed straight away. We can decipher what will happen in the immediate future of the novel when Stevenson says ‘Silver†¦was watching his companion like a snake about to spring.’ This shows Silver is a conniving, cunning creature, which will do anything to get the treasure, even kill one of his own. As well as this, in the bible, snakes are seen as evil, such as in the Garden of Eden, and people were very religious back then. Also, we now know that Tom will be killed sooner rather than later because snakes don’t waste time, and once they have their target, they rarely fail, so this is a clever way of Robert Louis Stevenson building up to Long John Silver committing the murder. Fear imagery can be created using powerful adjectives and can also give us a strong sense of foreboding, through colours used, and words commonly associated with fear. In ‘grey melancholy woods, and wild stone spires’, the words ‘grey’ and ‘melancholy’ are commonly associated with apprehension, and we get a view to future events because the island in the readers mind is terrifying and forbidding, and Jim has to endure this to escape capture, however, bad images are everywhere, provoking the reader to imagine terrible things happening to Jim on the isle, such as his eventual capture by the pirates, and his life threatening encounter with Israel Hands, in which, he is just successful. Through the citation ‘the outline of the Spy-glass trembled through the haze,’ we get fear from trembled, because not only is it an imposing land mass, it also is surrounded by a mist, and appears to move. Jim knows he must pass close to this monster of a mountain if he is to succeed on his quest, and it means he has the evil, obsessed pirates on one side, and a sinister peak in front, he is certain to encounter them on his travels, and the chances are, face the consequences. ‘Then one horrid, long-drawn scream’ is an example of fear imagery because you can imagine a high pitched scream, and the reader sees him or herself in Jim’s position, alone on a desert island, and is also scared. The assonance of the ‘oo’ and ‘a’ slows down the action and gets us to feel and imagine the scream. This shows foreboding because the allies of Jims and his alliance are being whittled down, and in the future there will be only a few remaining. The novel can also show us the imminent events through the use of assonance and consonance. Assonance (the repetition of vowels) is given in ‘should I dare to go down to the boats among those fiends, still smoking from their crime?’ The way the ‘o’ sound is repeated many times, and how the sentence flows off the tongue, gives a constant reminder throughout the sentence of the fear that Jim faces, and the decisions he is required to make. In the future, does Jim return to the pirates in hope of a return to the ship, but face Silvers wrath, or does he journey on into the centre of the island in hope of survival, and we know that in the end, the hero Jim ends up in both of these positions, but the reader does not know this and is left guessing. To demonstrate the use of assonance, the sentence ‘what if I returned to the boats and the fiends, still shadowed by their crimes’ is nowhere near as effective, and creates only a pinch of the fear found in Stevenson’s actual work. Assonance is also found in a very obvious place. The ‘o’ sound is repeated in ‘Long John,’ which is terrifying, as we know he is a main character who is also very evil, and it will be a constant reminder through the future of the novel as to his plans and his traits and the threat he poses. Consonance (the repetition of consonants) can also be found frequently in chapters 13 and 14 and can show us foreboding. In ‘only the rustle of the redescending birds and the boom of the distant surges disturbed the languor of the afternoon,’ the repetition of ‘r’ gives the section of text a fear effect along with the good adjectives, because overall, it is speeded up, and creates more of a fast paced action. Also, the atmosphere is affected by the use of onomatopoeia in ‘rustle’ and ‘boom.’ Again, an insight is achieved as through the use of effective adjectives and consonance, we see that not all is well on Skeleton Island. Skeleton Island itself suggests fear, as skeletons are a symbol of death and forbidding, and you would be wise to stay away from them. Combining fear adjectives with consonance is also found in ‘a smell of†¦rotting tree trunks.’ The use of an ellipsis shows that Jim is thinking and he must recognise the smell from somewhere before. The repetition of ‘r’ along with rotting creates a sense of fear of the trees, and this is also alliteration, and Jim and the reader begin to think that the island and everything on it must be similar to the experiences here. Through repetition, Stevenson achieves fear, and allows the reader to generate a better image in their mind, as well as emphasising his point further. ‘Of all the gloomy features of that gloomy afternoon,’ is an example of this. When the author/Jim repeats gloomy, it repeats the fact that the place is gloomy, which is an adjective commonly associated with darkness and fear, so it is stressing that everything is not going well. There is also time left in the day, and other bad things may happen, for instance, Jim running into a trap set by Long John Silver, or the good side being forced out of the stockade by the pirates, and this could just be the beginning. As well as all these things, the repetitions also create a sense of dà ¯Ã‚ ¿Ã‚ ½jà ¯Ã‚ ¿Ã‚ ½ vu, and that people are going round in circles and they are lost, and all for the treasure, which is the main focus of the novel. Another literary technique that the author uses is alliteration. ‘The sun still shining mercilessly.’ This is personification, and the consecutive letter s at the start of each word, along with an adjective that is connected with fear and evil created the illustration of the sun being evil, all seeing, and it seems to have deserted the good side, and just seems to be causing more heartache, as they lose the stockade, and the pirates get on the trail of the buried treasure. The overall theme of the chapters generates a sense of foreboding just by itself, because they are to do with pirates and a treasure hunt, and everyone knows that this kind of story is almost certain to have twists and turns later. I also think Jim how Jim goes off by himself into the forest shows he is developing from a boy into a brave young man. Through the use of colours in his writing, Stevenson also creates both a sense of fear and foreboding. ‘Long John Silver’ is an example of this because Silver is a shade of grey, which is a colour associated with grim things and fear, and it shows foreboding because, if a person is named like this, he must be a character that is planning, or will partake in evil things at some point in the novel. The author also uses black I ‘black conscience’ to describe Lon g John, as he can kill all these people, and not have them on his mind for the rest of his life, and not feel guilty. In conclusion, I think that the literary techniques used in chapters 13 and 14, are very effective in showing how, or giving hints as to how events may unfold in the latter stages of the novel, as they get closer to the treasure and the race hots up. As I have shown earlier I in my essay, Robert Louis Stevenson uses a great variety of different methods to get his points across, and he is very clever in using some techniques and how they foreshadow events easy to find, however, some you have to search for, and rack your brain to understand how they show foreboding, such as the use of assonance and alliteration. Example, ‘should I dare to go down to the boats among those fiends, still smoking from their crime?’ Yes, the excellent adjectives help create fear which in turn introduces foreboding, but I had to search for it. My final verdict is that Robert Louis Stevenson is an immensely clever writer, and the way he gets the reader to think is amazing, and through close language analysis, we can see that chapters 13 and 14 are very clear in predicting character development and how events will pan out in the novel.

The Power of the Author on a Novel - 834 Words

D.H. Lawrence’s 1926 short story The Rocking-Horse Winner is one that defies the test of time. The story of Paul trying to save his family from money issues is still being read in literature classes today. One reason the short story is such a masterpiece is Lawrence’s ability to use the author of the tale to manipulate the reader and portray certain information. The stylistic features of the author in this short story portrays to the reader that the theme of the tale is the morale lesson, that money doesn’t fix life or character problems. The first indication Lawrence is writing a moral based short story is the demonstration by the author that the story is a fairy tale like telling. To begin with, the author of this short story is†¦show more content†¦By providing little details about the characters and the environment, the author is drawing attention away from the story itself, but rather on the characters and the general them of the story. The author does not want the reader to put his or herself into the story. Instead, the author’s style is forcing the reader to relate the story to his or her’s respective life. This forces the reader to connect to the theme of the tale due to the story being relatable and possible in the reader’s life. This, in turn, creates a more dramatic affect when the boy dies at the end of the story. The reader takes this information and determines that the morale of the story is a strong and powerful one, one that should be implemented in his or her’s ow n life. For the author to make a morale lesson the theme of The Rocking-Horse Winner, it is necessary for the author to be completely reliable as the teller of the short story. As mentioned earlier, the author is using the tactics of a fairy tale story which creates the depiction that the theme is more important than the story itself. In other words, the story’s main priority is to teach the morale lesson. Due to this, the reader gets the impression that there is no reason for the author to be unreliable in telling the story, since there would be no purpose in doing so. Another way the reader can conclude that theShow MoreRelatedA Comparison of The Chrysalids and Animal Farm Essay765 Words   |  4 Pagessomewhat different personalities and that novels behold essential and key roles in our daily lives; they shape and influence our world in numerous ways via the themes and messages expressed by the authors. It is so, due to the different likes of our population, that we find numerous types and genres of books on our bookshelves, each possessing its own audience of readers and fans. 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Creating a novel comes from within an author’sRead MoreScott Fitzgeralds The Great Gatsby and John Steinbecks The Grapes of Wrath1720 Words   |  7 PagesGreat Gatsby and John Steinbecks The Grapes of Wrath In the novels The Great Gatsby by Scott Fitzgerald and The Grapes of Wrath by John Steinbeck, the authors present similar ideas, but use different methods to portray them. Similarities in themes can be made between the two texts; these include the pursuit of the American Dream and the use and misuse of wealth. Other themes are also central to each novel, the strength in unity and the influence of female charactersRead MoreAnalysis Of Time Out Of Joint By Philip K. Dick1323 Words   |  6 PagesMoral power held by literature or art has often crushed against some form of material power and censorship. 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Informative Speech About Leukemia - 1279 Words

On January 13th, 1995 at only two and a half years old my life would forever be changed. Spending several hours at the playground playing with my mom and siblings, I was exhausted from the heat so I decided to take a nap in my wagon, little did I know from there things would take a turn for the worst. My mom decided it was time to return home to bathe and put us to bed. Unfortunately, I would not wake up from what my mom though was a nap. She suddenly realized that I had a fever that just kept increasing. From there I was rushed to children’s hospital to run some tests and was diagnosed with Acute Lymphoblastic Leukemia. Here is a question for you, how many people in the united states do you think get leukemia in a year? According to the†¦show more content†¦There are several types of treatments that are used to treat leukemia. The first goal of treatment is to get blood counts back to normal by destroying signs of leukemia in the body and to make the symptoms go away . If this succeeds and the bone marrow begins to look healthy than the cancer is said to be cleared. This is called remission, while in remission, more therapy may be given to prevent a relapse. Chemotherapy is the first treatment given to achieve remission. It is sometimes required that the person may need to stay in the hospital for chemotherapy. Chemotherapy is given into the veins by iv and sometimes into the fluid around the brain (the spinal fluid) this is called a spinal tap. Chemotherapy is the treatment that I had done to cure my cancer to help me go into remission. Since I was so young and the chemotherapy was so strong I had no choice but to stay in the hospital to receive treatment. Sometimes month and months would go by which lead to me spending birthdays and holidays in the hospital. Luckily, I was receiving treatment at one of the best hospitals in Dallas, Texas which was Children’s Hospital because they made my time being there as fun as they could to help ge t through the pain and keep my mind off things. Since I was so young I did not know what was going on or why this was happening to me, I just knew I was sick and was trying to get better and needed extra care to make that happen. Another commonShow MoreRelatedHsm 542 Week 12 Discussion Essay45410 Words   |  182 Pagestype of viewing. Resource:   Pozgar, G., (2012). Legal aspects of health care administration (11th ed.). Jones Bartlett Learning. | | | | | RE: Hello | Lloyreen Moss | 3/7/2013 6:59:20 PM | | | Im wondering what everyone things about the recent news story of   a nursing home in Bakersfield California who has a policy against its employees giving CPR?  Ã‚   I am required to have CPR certification as a massage therapist.   When I went through the training, I was under the impression thatRead More_x000C_Introduction to Statistics and Data Analysis355457 Words   |  1422 Pageswritten permission of the publisher. Thomson Higher Education 10 Davis Drive Belmont, CA 94002-3098 USA For more information about our products, contact us at: Thomson Learning Academic Resource Center 1-800-423-0563 For permission to use material from this text or product, submit a request online at http://www.thomsonrights.com. Any additional questions about permissions can be submitted by e-mail to thomsonrights@thomson.com. Printed in the United States of America 1 2 3 4 5 6 7 11 10