Recent questions without an upvoted answer

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Design a polymer-based smart material that changes color when exposed to a specific chemical or environmental stimulus. How would you choose the appropriate polymer and chemical to achieve this objective? What factors would you consider in optimizing the material's response time and sensitivity?

asked Feb 4 in Polymer Chemistry by BrandenBreez (360 points)

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1 answer 43 views

Design a polymer-based sensor that can measure the pH of a solution. Provide details on the properties of the polymer, the mechanism of sensing and the range of pH measurements that the sensor can detect.

asked Feb 4 in Polymer Chemistry by LaceySimpkin (270 points)

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1 answer 9 views

Design a polymer-based sensor that can detect the presence of heavy metals in water and suggest a mechanism for its working.

asked Feb 4 in Polymer Chemistry by MadgeLemberg (250 points)

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1 answer 45 views

Design a polymer-based sensor for detecting the presence of ethanol in aqueous solutions, and provide a detailed explanation of the principles behind its operation.

asked Feb 4 in Polymer Chemistry by JXXSharyl82 (370 points)

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1 answer 41 views

Design a novel polymer-based drug delivery system for targeted cancer therapy that ensures controlled and sustained drug release with minimal adverse effects on healthy cells. Consider the physicochemical properties of the drug and the polymer, as well as their interactions and biocompatibility. Provide a detailed explanation of the mechanism of drug release and the potential benefits of the proposed system.

asked Feb 4 in Polymer Chemistry by JarrodKnorr7 (430 points)

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1 answer 38 views

Design a novel drug delivery system using graphene oxide as the carrier material. Describe the synthesis method and characterize the physicochemical properties of the drug-loaded graphene oxide by using various techniques such as X-ray diffraction, Fourier transform infrared spectroscopy, and zeta potential measurements. Evaluate the drug release properties and compare it with the current drug delivery systems available in the market.

asked Feb 4 in Materials Chemistry by Brent345895 (230 points)

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1 answer 9 views

Design a novel biodegradable polymer and investigate its synthesis using sustainable and green chemistry practices.

asked Feb 4 in Polymer Chemistry by CharityCouse (450 points)

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1 answer 9 views

Design a new drug for a specific type of cancer, outlining the molecular structure and mechanism of action, considering its effectiveness, safety profile, and potential side effects, using medicinal chemistry principles and techniques.

asked Feb 4 in Medicinal Chemistry by BlytheField0 (350 points)

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1 answer 44 views

Design a multi-step synthesis of 2-phenylbutanoic acid starting from benzene and any other necessary reagents, using retrosynthesis to plan the reaction steps. Include reaction mechanisms, reagents, and conditions for each step.

asked Feb 4 in Organic Chemistry by RafaelaEngel (370 points)

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1 answer 41 views

Design a method of transportation and storage for flammable and toxic chemicals that minimizes the risk of leakage, spillage, fire or explosion, while keeping in mind the potential impacts on human health and the environment. Consider different factors such as the type of chemicals, routes of transportation, type of containers, safety measures, regulations, and emergency response plans.

asked Feb 4 in Chemical engineering by AurelioR7069 (470 points)

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1 answer 38 views

Design a lubricant production system that can produce 1000 liters of lubricant per hour for use in heavy machinery. The system should be cost-effective, environmentally friendly, and able to meet industry standards for quality and performance. Include a detailed process flow diagram and a list of the necessary raw materials, equipment, and safety precautions for the production process. Additionally, calculate the total production cost per liter of lubricant and propose strategies for reducing production costs without compromising product quality.

asked Feb 4 in Chemical engineering by EstelleDibel (310 points)

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1 answer 31 views

Design a heterocyclic compound using pyridine as a starting material and incorporating at least one nitrogen atom in the heterocyclic ring. Draw the reaction mechanism involved in the synthesis and explain the role of each reagent used in the synthesis.

asked Feb 4 in Organic Chemistry by TristanMarlo (400 points)

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1 answer 31 views

Design a heat exchanger that can transfer heat from a 10,000 L/h hot water stream at 80°C to a 5,000 L/h cold water stream at 20°C with a maximum temperature difference of 10°C. Calculate the required heat transfer area and select appropriate materials for the heat exchanger components based on the fluids' properties and operating conditions.

asked Feb 4 in Chemical engineering by OctaviaBarne (530 points)

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1 answer 32 views

Design a heat exchanger that can effectively transfer heat between a hot stream of ethanol with a flow rate of 2 kg/s and a cold stream of water with a flow rate of 5 kg/s. The inlet temperature of ethanol is 80°C, while the inlet temperature of water is 20°C. The outlet temperature of ethanol should be 30°C, while the outlet temperature of water should not exceed 35°C. The heat exchanger should have a heat transfer coefficient of at least 500 W/m^2K and a total surface area of no more than 10 m^2.

asked Feb 4 in Chemical engineering by TaraFreeleag (290 points)

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1 answer 44 views

Design a heat exchanger for the production of sulfuric acid at a flow rate of 1000 liters per hour. The inlet temperature of the acid is 80°C and the desired outlet temperature is 30°C. The cooling water is available at 20°C and has a flow rate of 2000 liters per hour. Determine the required heat transfer area of the heat exchanger assuming the overall heat transfer coefficient is 800 W/(m²K). What material would you recommend for the heat exchanger tubes and why?

asked Feb 4 in Chemical engineering by MaiPorter008 (510 points)

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1 answer 41 views

Design a heat exchanger for a specific process that involves heating a liquid from 20°C to 60°C. The liquid has a flow rate of 500 L/hr, and it will be heated by steam at a pressure of 3 bar. The heat transfer coefficient for the steam is 3000 W/(m²·K), and the overall heat transfer coefficient for the heat exchanger is 500 W/(m²·K). Determine the surface area required for the heat exchanger and the flow rate of steam required to heat the liquid.

asked Feb 4 in Chemical engineering by LeslieFoss37 (570 points)

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1 answer 39 views

Design a heat exchanger for a specific process involving the heating of ethanol from 20°C to 80°C. The process flow rate of ethanol is 200 L/hr, and the heating medium is water available at 90°C with a flow rate of 500 L/hr. The heat transfer coefficient for the heat exchanger is 1000 W/m²K. Determine the surface area required for the heat exchanger to achieve the desired heating of ethanol using the given data.

asked Feb 4 in Chemical engineering by MillieFowlke (550 points)

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1 answer 41 views

Design a heat exchanger for a specific process in which a 50,000 kg/day of a mixture with a specific heat capacity of 3.5 kJ/kg.K needs to be heated from 20°C to 70°C using a hot stream of 100,000 kg/day of a fluid with a temperature of 150°C. The heat exchanger needs to operate with a heat transfer coefficient of at least 400 W/m2.K and the pressure drop across the heat exchanger should be no more than 0.5 bar. What type of heat exchanger would be most suitable and what are the dimensions required to achieve the desired performance?

asked Feb 4 in Chemical engineering by NormandSwaff (650 points)

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1 answer 38 views

Design a heat exchanger for a process where hot air (80°C) needs to be cooled down to 30°C using water (10°C) as the cooling medium. The flow rate of hot air is 2 kg/s and the desired outlet temperature of the cooled air is 35°C. The maximum allowable pressure drop for air side is 50 kPa and for water side is 100 kPa. Design the heat exchanger using the LMTD (logarithmic mean temperature difference) method and calculate the required area of heat transfer.

asked Feb 4 in Chemical engineering by SherlynSprig (590 points)

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1 answer 52 views

Design a heat exchanger for a factory that produces 10,000 liters of sulfuric acid per day starting at 70°C and needs to be cooled to 40°C for packaging. The available cooling water supply from the local municipal is at 20°C and is available at a flow rate of 1000 liters per minute. Design the heat exchanger to achieve the required temperature drop and calculate the heat transfer coefficient and the overall heat transfer coefficient.

asked Feb 4 in Chemical engineering by ChiquitaHaun (250 points)

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