Semi-Automated Sulfuric Acid Test

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Posted 4 days ago

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Project Title: Microfluidic / Paper-Based Diagnostic Engineer for Sulfuric Acid Delivery System (Methanol Detection Device) Project Overview We are developing a paper-based diagnostic strip for methanol detection in alcoholic beverages using the chromotropic acid method. The device uses oxidation chemistry to convert methanol to formaldehyde, followed by a sulfuric acid-assisted chromotropic acid reaction that produces a visible purple color response. Our current challenge is stabilizing and controlling concentrated sulfuric acid within the paper strip architecture while maintaining strong, reproducible color development and preventing acid migration, evaporation, or inconsistent reagent performance. We are seeking an experienced engineer (chemical, biomedical, microfluidics, diagnostics, or materials engineering background) to help design an effective acid-retention and controlled-release system for the strip. Project Goals We need expert guidance on: - Controlled retention of concentrated sulfuric acid within a paper-based diagnostic strip - Designing an in-line acid-release layer compatible with downward capillary flow - Preventing sulfuric acid flooding, evaporation, hygroscopic instability, and false positives - Improving color consistency and chromotropic acid reaction intensity - Material selection for acid-resistant components (PP, PVDF, PTFE, glass fiber, silica matrices, etc.) - Designing a manufacturable prototype architecture suitable for prototyping and eventual scale-up Current Concepts Being Explored We are currently investigating: - Silica gel coated paper - PVDF membrane barriers - Glass fiber acid-retention layers - 3D printed micro-reservoirs / acid-release cassettes - Solid-supported sulfuric acid matrices - Alternative acids to sulfuric acid for improved stability We would like help determining the best practical design approach. Deliverables Requested We are looking for: - Technical review of our current concept - Recommended strip architecture (layer-by-layer design) - Suggestions for controlled sulfuric acid delivery mechanism - Material recommendations for acid compatibility and manufacturability - Guidance on whether a 3D printed cassette, spacer system, porous insert, or alternative approach is most suitable - Optional: basic CAD concept sketch or engineering schematic Preferred Experience Strong preference for experience in one or more of the following: - Lateral flow assays - Paper microfluidics - Diagnostic strip development - Lab-on-paper systems - Reagent strip engineering - Microfluidic chemical delivery systems - Strong acid-compatible material systems - Membrane and polymer design Ideal Background - Chemical Engineering - Biomedical Engineering - Materials Engineering - Diagnostics Product Development - Microfluidics Engineering Project Type Initial consultation + design recommendation Potential for ongoing collaboration depending on outcomes. Please include: - Relevant project examples - Experience with paper diagnostics or microfluidic systems - Experience with acid-resistant materials or reagent strip systems - Estimated consultation availability and approach

Biomedical Engineering

Electrical Engineering

Mechanical Engineering

Project ID: 40396486

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4 freelancers are bidding on average $30 AUD for this job

@jowayne77

Hello, As an engineer with a solid background in Electrical, Mechanical, and Structural Engineering, I possess a diverse range of skills that I believe would be highly valuable for your project in designing an effective acid-retention and controlled-release system for the strip. Pitching: I am capable of bringing a unique perspective to the table. Over the course of my 7+ years in the construction industry, I have mastered the art of crafting detailed structural plans that are efficient, reliable, and resilient. Working with software such as AutoCAD and REVIT has given me an upper hand in understanding complex design interfaces - a skill that is hugely relevant to your project. Additionally, the materials used in my projects were carefully selected to withstand external factors like weather and other natural elements. Similarly, my ability to perform under tight deadlines and ensure quality results aligns well with your need for efficient problem-solving. Utilizing my extensive experiences performing comprehensive structural designs for various building types, I am confident of offering you innovative recommendations concerning material biocompatibility, manufacturability, and stripe architecture suitable for your device. Let's collaborate on this audacious project and build amazing things together! Thanks!

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@davidf087

⭐⭐⭐⭐⭐ I have direct experience in paper microfluidics and diagnostic strip development, including controlled reagent delivery systems and material selection for chemically aggressive environments. I will review your current concepts, propose a layer-by-layer strip architecture, and recommend a stable sulfuric acid retention and release strategy using acid-compatible membranes and porous matrices. My previous work includes designing lab-on-paper devices with controlled capillary flow, reagent stabilization, and consistent colorimetric response under variable conditions. You will receive clear technical guidance, material recommendations, and a practical, manufacturable design approach for prototyping and scale-up.

$20 AUD in 3 days

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@fadli221289

Hello, I have hands-on experience developing a 3-axis automation system for a bioreactor filling process, using a servo-controlled peristaltic pump with dosing precision up to 0.1 mL. This system was developed for a medical device company in Singapore, where accuracy, repeatability, and reliability were critical. I’m a Mechanical & Automation Engineer with 14+ years of experience in machine design, automation, and real manufacturing. I can support the development of your semi-automated sulfuric acid testing device by providing a complete engineering solution—from concept to implementation. My expertise includes precision mechanical design for fluid handling, selection of acid-resistant materials (PTFE, PVDF, PP), electrical system design, control system selection, and programming. I understand the challenges of handling sulfuric acid, such as corrosion, evaporation, and unstable flow. I can help design a controlled dosing and delivery system to ensure safety, consistency, and reliable test results. With my hands-on experience and CNC workshop background, I ensure every design is practical, manufacturable, and ready for real-world application. Let’s discuss your requirements. Best regards, Fadli

$20 AUD in 5 days