Silver-Loaded Activated Carbon Fiber With Uniform Silver Distribution
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Solution Overview
Problem
Existing methods for preparing silver loaded activated carbon fiber result in uneven distribution and unstable silver particles, leading to poor antimicrobial properties due to inadequate loading and weak binding between silver and activated carbon fibers.
Innovation Solution
A method involving treating viscose fibers with hydroxyalkyl cyclodextrin and silver salt solutions, followed by controlled heating in deionized water and nitrogen atmospheres, to achieve evenly distributed and stable silver particles on the activated carbon fiber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If silver is loaded onto fibers before carbonization and activation, then the fiber structure is formed, but the silver distribution becomes uneven and particle size becomes non-uniform
Solution Approach 1:
The patent applies preliminary action by loading silver ions onto the fiber surface before carbonization and activation processes. The silver ions are incorporated into the fiber structure during these thermal treatments, ensuring uniform distribution and controlled particle size formation. This preliminary loading followed by controlled thermal processing resolves the contradiction between achieving even silver distribution and maintaining uniform particle size.
Solution Approach 2:
The patent utilizes parameter changes by controlling the carbonization and activation temperature ranges (typically 600-1200°C) to transform the loaded silver ions into uniformly distributed metallic silver particles. By precisely controlling these thermal parameters, the invention achieves both even silver distribution and uniform particle size, resolving the technical contradiction.
2Stability of the object's composition
If silver is loaded onto activated carbon fiber after carbonization and activation, then the fiber structure is preserved, but the binding between silver particles and activated carbon fiber becomes weak
Solution Approach 1:
The patent applies preliminary action by loading silver ions onto the fiber surface before the activation process. This allows the silver to become integrated into the fiber structure during carbonization and activation, creating strong chemical bonds between silver particles and the activated carbon matrix. This preliminary loading ensures long-term stability and prevents silver particle dissociation during use, extending the service life of the material.
Solution Approach 2:
The patent creates a composite material structure where silver ions are incorporated into the activated carbon fiber matrix during the thermal processing stages. This results in a tightly integrated composite where silver particles are strongly bound to the carbon fiber, preventing dissociation and maintaining structural integrity throughout the service life of the material.
3Reliability
If silver is loaded onto activated carbon fiber after carbonization and activation, then the fiber structure is preserved, but the antimicrobial properties become poor
Solution Approach 1:
The patent applies preliminary action by loading silver ions onto the fiber surface before carbonization and activation. This ensures optimal silver distribution and strong binding within the fiber structure, resulting in superior and reliable antimicrobial properties. The preliminary loading allows for better control of silver particle size and distribution, which are critical for effective antimicrobial activity.
Solution Approach 2:
The patent utilizes parameter changes by optimizing the carbonization and activation temperature ranges to ensure proper reduction of silver ions to metallic silver particles with appropriate size and distribution. By controlling these thermal parameters, the invention achieves both ease of manufacture through a straightforward process and reliable antimicrobial properties through uniform silver particle formation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method produces silver loaded activated carbon fibers with uniform silver distribution and stable antimicrobial properties, maintaining effectiveness even after six months of storage.
Implementation Method 1
treating a viscose fiber with a hydroxyalkyl cyclodextrin aqueous solution to obtain a hydroxyalkyl cyclodextrin loaded viscose fiber
Implementation Method 2
heating the hydroxyalkylated cyclodextrin and silver salt loaded viscose fiber in deionized water at 80 to 100° C. to obtain a silver loaded viscose fiber
Implementation Method 3
treating the silver loaded viscose fiber with a disodium hydrogen phosphate aqueous solution and then heating the treated silver loaded viscose fiber under nitrogen at 400 to 600° C. to obtain a silver loaded carbon fiber
Implementation Method 4
heating the silver loaded carbon fiber under nitrogen and water vapor at 900 to 1,200° C. to obtain the silver loaded activated carbon fiber
Data Source
AI summary
A method of preparing a silver loaded activated carbon fiber includes the following steps. A viscose fiber is treated with a hydroxyalkyl cyclodextrin aqueous solution to obtain a hydroxyalkyl cyclodextrin loaded viscose fiber. The hydroxyalkyl cyclodextrin loaded viscose fiber is then treated with a silver salt aqueous solution to obtain a hydroxyalkyl cyclodextrin and silver salt loaded viscose fiber. The hydroxyalkylated cyclodextrin and silver salt loaded viscose fiber is heated in deionized water at 80 to 100° C. to obtain a silver loaded viscose fiber. The silver loaded viscose fiber is treated with a disodium hydrogen phosphate aqueous solution and then heated under nitrogen at 400 to 600° C. to obtain a silver loaded carbon fiber. The silver loaded carbon fiber is heated under nitrogen and water vapor at 900 to 1,200° C. to obtain the silver loaded activated carbon fiber.