Porous Multishell Hollow Cu2O Microspheres Experiment

Porous Multishell Hollow Cu2O Microspheres Experiment Preparation of Porous MultishellHollow Cu2O Microspheres and their catalytic activity in photodegradation of Rhodamine-B Lingling Sun, Deyan Han*, Ruirui Haoà ¯Ã‚ ¼Ã…’Guohong Wang* Abstract In this study, Porous Multishell Hollow Cu2O Microspheres were fabricated by One-Pot solvothermal method of copper(II) with glutamic acid under 160à ¢Ã¢â‚¬Å¾Ã†â€™. The as-prepared monodisperse Cu2O hollow microspheres were characterized by Xà ¯Ã¢â€š ¬Ã‚ ­ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), fourier transform infrared spectroscopy (FTIR), photoluminescence (PL), and thermogravimetryà ¯Ã¢â€š ¬Ã‚ ­differential thermal analysis (TGà ¯Ã¢â€š ¬Ã‚ ­DTA). The formation of hydroxyl radicals ( ·OH) on the surface of UVà ¯Ã¢â€š ¬Ã‚ ­illuminated Cu2O is probed by photoluminescence using terqaephthalic acid as a probe molecule. The photocatalytic activity of monodisperse Cu2O hollow microspheres have been tested by degradation of Rhodamine B (RhB) and PL spectral changes of terephthalic acid under UV light. The results showed that the optimum add of glutamic acid is 0.05g and reaction time was 24h, respectively. Introduction Transition metal oxides with different nanostructures have drawn much attention in recent years because of their fascinating applications in optoelectronics and outstanding structureal flexibility combined with unique properties with potential applications.[10à £Ã¢â€š ¬Ã‚ 17à £Ã¢â€š ¬Ã‚ 19] So the transition metals oxides are an important class semiconductors. Among these transition metal oxides, Cuprous oxide ( Cu2O ) is a pà ¯Ã¢â€š ¬Ã‚ ­type semiconductor material with a narrow band gap (2 eV) and a large excition binding energy of 140 meV, it is non-toxic, inexpensive and abundand that widely used in photocatalysis, gas sensors, lithiumà ¯Ã¢â€š ¬Ã‚ ­ion batteries, electronics, solar energy conversion, magnetic storage, and so on. To date, different Cu2O nanostructures use capping agent or surface active agent have been synthesis, such as cetyltrimethylammonium bromide (CTAB), polyvinylpyrrolidone (PVP) and sodium dodecyl sulfate (SDS) were widely used to synthesize Cu2O nano wires, Cu2O nanotubes, Cu2O nanothreads, Cu2O nanocubes, flowerà ¯Ã¢â€š ¬Ã‚ ­like Cu2O, urchin-like Cu2O, hollow Cu2O spheres. Hollow spheres have attracted great interest because of their special properties including low density, high surface area, good surface permeability and distinct optical properties. [15] Wang’s group add of cetyltrimethylammonium bromide developed a facile room temperature solution route for synthesis of doubleà ¯Ã¢â€š ¬Ã‚ ­wall Cu2O hollow spheres. Zeng et al. [9] reported the preparation of hollow Cu2O nanospheres from a reductive conversion of aggregated CuO nanocrystallites and the formation of CuO microspheres by a twoà ¯Ã¢â€š ¬Ã‚ ­tiered organizing scheme. However, the poor conductivity limite Cu2O further application. In the present work, Porous Multishell Hollow Cu2O Microspheres have been synthesized using oneà ¯Ã¢â€š ¬Ã‚ ­pot solvothermal method of copper nitrate with glutamic acid under 160à ¢Ã¢â‚¬Å¾Ã†â€™ after different hydrothermal time. Morphological, structural and optical properties and thermal behavior of the products have been identified using scanning electron microscopy (SEM), transmission electron microscopy (TEM), Xà ¯Ã¢â€š ¬Ã‚ ­ray diffraction (XRD), Fourier transformer infrared (FTIR) spectroscopy, UV-visibleà ¯Ã¢â€š ¬Ã‚ ­NIR spectroscopy and thermogravimetryà ¯Ã¢â€š ¬Ã‚ ­differential thermal analysis (TGà ¯Ã¢â€š ¬Ã‚ ­DTA) and photoluminescence (PL). The other aim of present work is the investigation of the photocatalytic degradation of RhB under UVà ¯Ã¢â€š ¬Ã‚ ­light radiation at ambient temperature and using of Cu2O nanopowders synthesisd with different hydrothermal time. The porous Multishell Hollow Cu2O Microspheres exhibit a high photocatalytic activity due to the fact that Cu2O Microspheres have a high specific surface area and a larger band gap. Experimental 2.1 Synthesis of Hollow Cu2O Microspheres Analytical grade copper nitrate (Cu(NO3)2 †¢3H2O, purity: 99.5%), Là ¯Ã¢â€š ¬Ã‚ ­ glutamic acid, and Rhodamineà ¯Ã¢â€š ¬Ã‚ ­B (C28H31ClN2O3, purity: 99.5%) were purchased from SigmaAldrich and were used without further purification. Deionized water was used for all synthesis and posttreatment processes. In a typical synthesis, 0.645 g Cu(NO3)2 †¢3H2O and 0.05g glutamic acid were dissolved in 75 ml absolute ethanol stirred until Cu(NO3)2 †¢3H2O was completely dissolved to form a navyà ¯Ã¢â€š ¬Ã‚ ­biue solution. After filtered with the filter paper, the filtrate was then transferred into a stainless steel autoclave with a Teflon liner of 100 ml capacity and heated at 160 à ¢Ã¢â‚¬Å¾Ã†â€™ for different time. After cooling at room temperature, the product was centrifuged, washed with deionized water and absolute ethanol several times and dried in an oven at 60 à ¢Ã¢â‚¬Å¾Ã†â€™ for 12 h. 2.2 Characterization Xà ¯Ã¢â€š ¬Ã‚ ­ray diffraction (XRD) was used to identify product phases and cprresponding crystallite size. XRD patterns were obtained using a D8 Xà ¯Ã¢â€š ¬Ã‚ ­ray diffractometer (Bruker AXS, German) with CuKÃŽ ±1 radiation (ÃŽ » = 1.5406 Ã…). The accelerating voltage, emission current, and scanning speed were 40 kV, 49 mA and 0.02à ¯Ã‚ Ã‚ ¯/s, respectively. Scanning electron microscopy (SEM) was performed with a S3400 SEM (Rili, Japan) at an accelerating voltage of 15 kV. Transmission electron microscopy (TEM) analysis was conducted using a Tecnai G20 microscope at an accelerating voltage of 200 kV. The Fourier transform infrared spectra (FTIR) of the samples were recorded on a Nicolet Forier 5700 spectrometer in the range of 400-4000 cm-1 using conventional KBr pellets. Photoluminescence (PL) spectra of the samples were measured at room temperature with a Hiachi FLà ¯Ã¢â€š ¬Ã‚ ­4500 fluorescence spectrophotometer, with an excitation wavelength of 315 nm, the scanning spee d is 1200 nm/min, and a PMT voltage of 700 V. The width of the excitation slit and emission slit was 5 nm. For thermal analysis, 10 mg of the dried Cu2O powders was used in TGà ¯Ã¢â€š ¬Ã‚ ­DTA thermal analyzer (Pyris Diamond TG/DTA) at a heating rate of 10à ¯Ã‚ Ã‚ ¯C/min from 20 to 800 à ¯Ã‚ Ã‚ ¯C in an inert gas atmosphere. 2.3 Photocatalytic performance Photocatalytic activity of the Hollow Cu2O Microspheres was evaluated by the degradation RhB aqueous solution under a 15 W ultraviolet lamp at room temperature (ca. 20 à ¢Ã¢â‚¬Å¾Ã†â€™). In each experiment, 0.04 mg of the prepared powders were dispersed in 30 ml of RhB aqueous solution with a concentrstion of 1.0Ãâ€"10-5 M in a rectangle cell (52W Ãâ€" 155L Ãâ€" 30H mm), and the solution was placed in the dark for 30min before illumination to ensure the establishment of an adsorption-desorption equilibrium between the photocatalyst powders and RhB. Then the solution was irradiated with a 30 mW/cm2 UV light (ÃŽ »=365 nm), and during irradiation about 3 ml of the suspension was taken from the mixture at regular intervals (20 min) and centrifuged to separate the photocatalyst particles. To determine the degree of degradation the supernatants was analyzed by a UVà ¯Ã¢â€š ¬Ã‚ ­vis spectrophotometer (Uà ¯Ã¢â€š ¬Ã‚ ­3010) to measure the concentration of RhB which exhibits characteristi c absorption at 554 nm [11] 2.4 Analysis of hydroxyl radical ( ·OH) The formation rates of hydroxyl radicals ( ·OH) on the surface of the UVà ¯Ã¢â€š ¬Ã‚ ­illuminated Cu2O were performed by a photoluminescence (PL) method using terephthalic acid as a probe molecule method as follows. 0.04 g of Cu2O powder sample was dispersed in a 30 ml of 5 Ãâ€" 10-4 M terephthalic acid aqueous solution with a concentration of 2 Ãâ€" 10-3 M NaOH in a dish with a diameter of about 9.0 cm. The experiment was carried out under UV irradiation using a 15 W ultraviolet lamp (25 cm above the dishes). The average light intensity striking on the surface of the reaction solution was about 30 mW cm-2, as measured by a UV radiometer with the peak intensity of 365 nm. PL spectra of generated luminescent 2à ¯Ã¢â€š ¬Ã‚ ­hydroxyterephtalic acid (TAOH) were measured on a Hiachi FLà ¯Ã¢â€š ¬Ã‚ ­4500 fluorescence spectrophotometer. After UV irradiation for every 15 min, the reaction solution was à ¯Ã‚ ¬Ã‚ ltrated to measure the increase of the PL intensity at 390 nm of TAOH ex cited by 315 nm light. Results and Discussion 3.1 XRD analysis The crystalline structures of the as-prepared samples were examined by Xà ¯Ã¢â€š ¬Ã‚ ­ray diffraction. Fig. 1 shows the XRD patterns of the asà ¯Ã¢â€š ¬Ã‚ ­prepared samples synthesized with different amounts of glutamic acid. The results illustrate that with increase glutamic acid from 0.02, 0.03, 0.04 0.05 to 0.06 g all the samples appear the sphere Cu2O[JCPDS No, 01à ¯Ã¢â€š ¬Ã‚ ­1142]. For the samples prepared with the amount of glutamic acid below 0.05 g, the intermediate product copper hydroxynitrate is dominant, but there is a amount of sphere Cu2O found in it. The peak at 2ÃŽ ¸ = 12.8 ° corresponds to the (011) plane diffraction of the copper hydroxynitrate [JCPDS No, 03-0061], with the amount of glutamic acid increase the diffraction peak of copper hydroxynitrate become weaker to disappears and the sphere Cu2O peaks intensities steadily become stronger, implying that glutamic acid acted as a reducing agent in the reaction process. To investigate the growth process of porous multishell hollow Cu2O microspheres, time-dependent experiments were studied by hydrothermal reaction. Fig. 2 shows that the products obtained at 160 à ¢Ã¢â‚¬Å¾Ã†â€™ with 0.05 g glutamic acid for 2 h are 5à ¯Ã¢â€š ¬Ã‚  ÃŽ ¼m hollow microspheres were wellà ¯Ã¢â€š ¬Ã‚ ­crystallize but still the intermediate product copper hydroà ¯Ã¢â€š ¬Ã‚ ­xynitrate. With increase reaction time to 24 h, the intermediate product copper hydroxynitrate complete transformed into cubic symmetry Cu2O, no obvious diffraction peaks of impurities were observed, indicating the high purity of the synthesized products. Also the intense and sharp diffraction peaks indicate that well crystallized Cu2O nanocrystalss can be obtained under reaction time is 24 h. But further prolongation of reaction time to 48 h resulted in the intensities of the diffraction pesks of Cu2O are not increase significantly. It can be founded that with increase in reaction time the intensity o f diffraction peaks increased, indicating the improvement in the crystallinity. [8] The diffraction peaks becomes narrower as the reaction time increased, indicating the increase in the crystallite size. 3.2 FTIR Studies. Fig. 4 showed the FTIR spectra of the Cu2O samples synthesized with additi0on of different amount of glutamic acid in the region of 400à ¯Ã¢â€š ¬Ã‚ ­4000 cm-1, which are relate to IR-active fundamental vibrations of Cu2O itself and vibrations associated with surface adsorbates. The intense vibrational bands at 3000-3600 cm-1 were attributed to Oà ¯Ã¢â€š ¬Ã‚ ­H stretching vibrations and at ~1635 cm-1 corresponded to Hà ¯Ã¢â€š ¬Ã‚ ­Oà ¯Ã¢â€š ¬Ã‚ ­H bending vibration all of surface adsorbed H2O. [30] The bands at 3000-3600 cm-1 was split into two components centered at ~3184 and ~3403 cm-1, corresponding to chemically adsorbed water complexes and physically adsorbed H2O, respectively . Besides, the IR band ~1346 cm-1 and ~1652 cm-1 are assigned to the surface monodentate carbonate-like (CO3) and bicarbonate species (HCO3) vibrational modes that because of adsorbed CO2 from the atmosphere. A metal oxide generally gives absorption bands below ~1000 cm-1 that arises from stretching vibration mode of Mà ¯Ã¢â€š ¬Ã‚ ­O bond. So the IR-active fundamental vibrations of Cu2O nanocrystals appear in 400à ¯Ã¢â€š ¬Ã‚ ­1000 cm-1, the band at 456 cm-1 and 633 cm-1 are attributed to the stretching vibrations of Cu1+à ¯Ã¢â€š ¬Ã‚ ­O bond confirm the formation of Cu2O phase. 3.3 SEM and TEM images. 3.4 Mechanism for the formation of porous multishell hollow Cu2O microspheres The formation of porous multishell hollow Cu2O microspheres can be explained by a self-transformation process of the metastable aggregated particles accompanied by the Ostwald ripening [11à £Ã¢â€š ¬Ã‚ 31].Similar mechanisms have been involved in the preparation of Cu2O, TiO2 and CdMoO4 hollow spheres [31]. The formation of mechanism of porous multishell hollow Cu2O microspheres in this work is proposed as illustrated as illustrated in Fig. During the Ostwald ripening process in order to reduce the higher surface energy, the crystallites at the central relocate themselves to the shell that formed the hollow structures. [14] Initially in the synthesis process, under the 160 à ¢Ã¢â‚¬Å¾Ã†â€™ hydrothermalconditions the uniform distribution of Cu2+ ions combine with glutamic acid to form Cu2(OH)3NO3 as intermediate hollow microsphereà ¯Ã¢â€š ¬Ã‚ ­template. The aggregated spherical particles have many voids in the surface, the reducing angent quickly though the channels in the intermedi ate hollow microsphereà ¯Ã¢â€š ¬Ã‚ ­template precipitate product in the internal surface of the shell form double shells. Also the internal microsphere sueface is loosely with many voids that not used up intermediate would grow third shells on the inner double shells and so on. At last form porous multishell hollow Cu2O microspheres. With the solvothermal time increase, glutamic acid contributed to the morphological evolution on the microstructure transformation and acted as a reducing agent the copper (à ¢Ã¢â‚¬ ¦Ã‚ ¡) reduced to copper (à ¢Ã¢â‚¬ ¦Ã‚  ), last cuprous oxide precipitated out because it have a low solubility in ethanol. 3.5 Photocatalytic Activity. The photocatalytic activities of the asà ¯Ã¢â€š ¬Ã‚ ­prepared porous multishell hollow Cu2O microspheres were ecaluated by photocatalytic degradation of RhB dye in aqueous solution under UVà ¯Ã¢â€š ¬Ã‚ ­light irradiation at room temperature. The RhB characteristic absorption at 554 nm was chosen to monitor the amount of RhB left during photocatalytic degradation process. Fig. 6 shows the UVà ¯Ã¢â€š ¬Ã‚ ­vis absorption spectrum of the RhB aqueous solution in the presence of (0.04 g) porous multishell hollow Cu2O microspheres under UVà ¯Ã¢â€š ¬Ã‚ ­light irradiation. For comparison, the photocatalytic activities of the Cu2O nanoparticles synthesized were all evaluated under the same conditions. It is observed that with time extended the absorption peaks of RhB diminish gradually, indicating the photocatalytic degradation of RhB. During the whole process there is no new absorption peak appear indicates the complete photodegradation of RhB. It can be seen that the samples of use 0.05g glutamic acid at solvothermally treated time increased from 2h to 48h, the degradation rate increase from 8.43% to 35.78%. Among them solvothermally treated 24h show the best performance, which show a 55.3% decrease of RhB after 40 min UV irradiation. Based on the above experimental results, this is not surprising because of the Cu2O band gap is 2.17 eV and it can be excited by photons with wavelengths below 349 nm (our light source is 365 nm UV light). [P2499] Also the unique porous multishell hollow structure which can be considered as an ideal transport way for reactant and product molecules moving in or out of the photocatalyst, making the chemical reactions occurring more quickly and easily. According to the present study nanoparticles size and crystalline nature play an important role in influence the photocatalytic activity.

Hamlet: Tragedy of Failure :: Shakespeare Hamlet Essays

Hamlet: Tragedy of Failure   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   William Shakespeare's, Hamlet is a tragedy of failure, the failure of a man placed in circumstances and faced to deal with them successfully. Shakespeare uses different techniques to develop the characters in Hamlet. Throughout the play dramatic irony is used by allowing the audience to view the true actions of the characters before the characters disclose them. Shakespeare toys with the idea of appearances versus reality in the play, among these are Claudius, the play within the play, and Rosencrantz and Guildernstern.      Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   Hamlet's father, the king of Denmark, has suddenly died. Claudius, Hamlet's uncle, hastily marries Gertrude, Hamlet's mother, and more importantly they become the new king and queen. King Claudius is viewed as legitimately gaining control of the throne by everyone except Hamlet. Hamlet knows that there is "something rotten in the state of Denmark." His belief is verified when the guards inform him of a ghostly figure with close resemblance to the late king. The ghost reveals to Hamlet that while in the garden, Claudius poured poison in his ear. Claudius prays to be forgiven but his prayers are not sincere. Claudius, overcome with guilt, would prefer to keep his status then reveal what he did to King Hamlet.      Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   The play within the play is useful because it allows Hamlet to verify the validity of the ghost. Usually plays are intended for entertainment purposes. The play is not real and the actors are playing a role.   In reality Hamlet makes it so that it is similar to what really happened to his father. Hamlet even goes as far as to instruct the actors appropriately.   He will prove that the ghost is truthful by the reaction on Claudius' face. The play appears to be harmless but it has a close parallel to what really happened to the late King Hamlet.      Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   Rosencrantz and Guildernstern, who are the king's spies, pretend to be friends to Hamlet. The king has sent for them to investigate Hamlet's madness and what he suspects about his father's death. This is a contradiction because later Claudius says that Hamlet's troubles are unknown. Hamlet not being the fool also pretends to be friends to Rosencrantz and Guildernstern. He reveals to them that he is aware of their intentions when he says "were you not sent for." Claudius, fearing Hamlet knows too much sends him with Rosencrantz and Guildernstern to England to Hamlet: Tragedy of Failure :: Shakespeare Hamlet Essays Hamlet: Tragedy of Failure   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   William Shakespeare's, Hamlet is a tragedy of failure, the failure of a man placed in circumstances and faced to deal with them successfully. Shakespeare uses different techniques to develop the characters in Hamlet. Throughout the play dramatic irony is used by allowing the audience to view the true actions of the characters before the characters disclose them. Shakespeare toys with the idea of appearances versus reality in the play, among these are Claudius, the play within the play, and Rosencrantz and Guildernstern.      Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   Hamlet's father, the king of Denmark, has suddenly died. Claudius, Hamlet's uncle, hastily marries Gertrude, Hamlet's mother, and more importantly they become the new king and queen. King Claudius is viewed as legitimately gaining control of the throne by everyone except Hamlet. Hamlet knows that there is "something rotten in the state of Denmark." His belief is verified when the guards inform him of a ghostly figure with close resemblance to the late king. The ghost reveals to Hamlet that while in the garden, Claudius poured poison in his ear. Claudius prays to be forgiven but his prayers are not sincere. Claudius, overcome with guilt, would prefer to keep his status then reveal what he did to King Hamlet.      Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   The play within the play is useful because it allows Hamlet to verify the validity of the ghost. Usually plays are intended for entertainment purposes. The play is not real and the actors are playing a role.   In reality Hamlet makes it so that it is similar to what really happened to his father. Hamlet even goes as far as to instruct the actors appropriately.   He will prove that the ghost is truthful by the reaction on Claudius' face. The play appears to be harmless but it has a close parallel to what really happened to the late King Hamlet.      Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   Rosencrantz and Guildernstern, who are the king's spies, pretend to be friends to Hamlet. The king has sent for them to investigate Hamlet's madness and what he suspects about his father's death. This is a contradiction because later Claudius says that Hamlet's troubles are unknown. Hamlet not being the fool also pretends to be friends to Rosencrantz and Guildernstern. He reveals to them that he is aware of their intentions when he says "were you not sent for." Claudius, fearing Hamlet knows too much sends him with Rosencrantz and Guildernstern to England to

Low cost strategy

As Jet Blue manages growth, the airline must also standardize many other things it does to avoid starting from scratch every time. For example, JetBlue has developed a checklist of what has to happen whenever it enters a new market. Everyone involved has access to the list on the corporate intranet. Each department sees what has been done, what remains to be done, deadlines, problems. Currently, the checklist makes launches that occur months apart more predictable. But before too long, it'll make simultaneous launches, unthinkable early on, manageable. JetBlue adopted a strategy for effective cost control by identifying and eliminating all unnecessary expenses and concentrating on providing high quality services to its passengers. Towards this end, it adopted a number of innovative measures on the planes such as: not serving food, point-to-point flights, and quick turnarounds. It also made effective use of advertising to position itself as a fun airline. JetBlue's innovative operational model helped it succeed at a time when the major players of the airline industry were crumbling. These activities and efforts are noteworthy and also improve efficiency, which will be critical in the years ahead as JetBlue tries to offset rising costs for aging planes and more-senior employees. And low costs remain an obsession. JetBlue's reservation agents, for example, work from home rather than in an expensive call center. At the same time, Neeleman is looking to widen profit margins again. A new 100-seat regional jet fleet being added next year will tap relatively uncontested — and so more profitable — markets. One of the latest tools designed to help JetBlue as it grows is an â€Å"operational recovery system.† During any disruption — weather that grounds some flights, for example — it allows planners to select various goals before rerouting planes. No canceled flights or delays beyond three hours? The software produces a solution and calculates its cost. It factors in each plane's maintenance and fuel needs, and the flight crew's experience and availability within FAA rules. With the current fleet of 57 planes, the program is a perk. Down the road, with 100 or more planes, it will be indispensable. (for more details, see the http://www.fastcompany.com/magazine official site)

Short Story - 1117 Words

A sudden shower of sparks cast a warm, golden light into the travel cruiser. Light. The heat reminded him of the summer and as he breathed in the air, rather than the scent of grass and deep earth overturned in the fields, he smelled the sick tinge of clinical metal and filtered air. Rowland opened his eyes to see sparks flying past the single window allowed in the single-occupant models. His arms, still bound by the restraints in the cryo-pod, fought against the metal braces until the automated voice announced the emergency collision alert. â€Å"Emergency Release Initiated,† the monotone voice announced. Rowland felt the restraints release as the rest of the life systems shut down and pulled away into standby†¦show more content†¦Propulsion†¦no, no†¦thrusters perhaps†¦oh, by the stars and all that dwells in the heavens, how do I move this blasted ship? His mind raced as the burning object drew closer and closer to the cruiser. â€Å"BRACE†¦ BRACE†¦BRACE,† the computer screeched between the static. Rowland felt one of the thrusters fire off, moving the cruiser slighting away, but it wasn’t going to give enough thrust in time to escape the impact. His mind stuck on the promotional plaque that reflected all the emergency lights on the control panel. The glistening icon of the five planets that made the Outer-Ring of the solar system began to glow with the burning star. â€Å"The Outer-Ring,† he said, laughing at the irony as he braced for impact. â€Å"A new step for mankind.† They promised that the Outer-Ring was a place where dreams do come true. But they forget that nightmares were dreams too. She was like the moon†¦part of her was always hidden from him. It was too late now, to ever really know her, he would have had to look up from his work to notice the beautiful stranger that was holding his hand. â€Å"Carson, we cannot be late!† he said as he slid the small metal case into her regulation-size travel container as they stopped for a moment to let her fix her shoe. Time was too short. It had always been. The spaceport was crowded with the day’s scheduled launches. 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