Hydrogel sensors with pH sensitivity

Rungsima, Chayapol; Boonyan, Netipong; Klorvan, Marhsilin; Kusuktham, Boonsri

doi:10.1007/s00289-020-03398-8

Cited by 12 publications

(6 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, diapers on the market only have the function of absorbing water, which will cause not only discomfort but even skin diseases such as eczema if they soak in urine for a long time. , At present, the wetness of smart diapers is mainly shown by the change of external color, but it is not conducive to the observation of caregivers. If the diaper is replaced regularly, it is easy to forget or no urine is found after replacement, resulting in waste. , Therefore, if a sensor sensitive to urine is developed and placed in the diaper, a smart diaper with an alarm function will be obtained, which will promptly remind caregivers to change the wet diaper and bring great relief to caregivers. , Our self-stretchable helical fibers are highly sensitive to water with flexibility, light weight, self-stretching, and wearability. They may be very suitable for detecting whether diapers contain urine so as to remind caregivers to change diapers in time and reduce or avoid skin diseases such as bedsore and eczema.…”

Section: Resultsmentioning

confidence: 99%

Self-Stretchable Fiber Liquid Sensors Made with Bacterial Cellulose/Carbon Nanotubes for Smart Diapers

Liang

Zhang

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Liquid sensors for detecting water and body fluids are crucial in daily water usage and health monitoring, but it is challenging to combine sensing performance with high tensile deformation and multifunctional applications. Here, a substrate-free, self-stretchable bacterial cellulose (BC)/carbon nanotube (CNT) helical fiber liquid sensor was prepared by the solution spinning and coiling process using BC as the water-sensitive matrix and CNTs as the active sensing materials. The BC/CNT (BCT) fiber sensor has a high stretch ratio of more than 1000% and a rapid response for a current change rate of 104% within 1 s, which is almost unaffected under washing and various stretching or knotting deformations. By combination of the BCT fiber, we can design smart diapers or water level detectors, which rapidly monitor the status of smart diapers or water level, and the monitoring result can be transferred on time through an alarm device or smartphone. In short, the scalable and continuous preparation of the self-stretchable BCT helical fiber will provide a capacious platform for the development of a wearable sensor applied in daily life (such as smart diapers, water level detection, etc.)

show abstract

Section: Resultsmentioning

confidence: 99%

Self-Stretchable Fiber Liquid Sensors Made with Bacterial Cellulose/Carbon Nanotubes for Smart Diapers

Liang

Zhang

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…The colour variation and the corresponding peak shifts exhibited by the dyes attributable to their structure alteration (Fig. 1d), in which the dyes became deprotonated under alkaline conditions and were protonated in acidic solution (Rungsima et al ., 2020; Ran et al ., 2021). The NH 3 solution is used to simulate amines that are generated during the spoilage of meat foods.…”

Section: Resultsmentioning

confidence: 99%

Colorimetric hydrogel indicators based on polyvinyl alcohol/sodium alginate for visual food spoilage monitoring

Tang

et al. 2022

Int J of Food Sci Tech

View full text Add to dashboard Cite

A colorimetric pH-sensitive hydrogel indicator integrated with the smartphone for real-time and visual food spoilage monitoring was developed. Herein, the poly(vinyl alcohol)/sodium alginate (PVA/SA) hydrogel was used as the carriers for the pH-sensitive mixed-dye methyl red/bromothymol blue (MR/BB), which can be employed as an amine indicator. The functional hydrogel was prepared by a simple freezing/thawing process that mainly performed in PVA and calcium cross-linking in SA. The optimal condition for the sensitivity of hydrogel towards ammonia and the structure of the hydrogel were investigated. The potential applications of the hydrogels in beef, fish, chicken and pork were evaluated under different storage conditions. Sigmoidal fitting results indicated that the RGB model with a smartphone can form a strong correlation with the total volatile basic nitrogen (TVB-N) values in common meat products. The hydrogel indicators with sensitive and stable properties have proven to be promising materials for use in food spoilage monitoring.

show abstract

“…Synthetic hydrogels as hydrophilic polymer networks can adsorb large quantities of water providing a unique material in between solids and liquids. [ 1,2 ] While unique in its properties as material, hydrogels can be chemically tailored in their composition which leads to various applications in agriculture, [ 3 ] sensors, [ 4,5 ] microfluidics, [ 6 ] or biomedicine. [ 7–9 ] Herein, functionalization with weak acidic and basic groups features smart, pH‐responsive hydrogels which not only can change their inherent properties such as swelling, stiffness, and net charge, [ 10 ] but also lead to the capability to adsorb and desorb charged species via electrostatic attraction and repulsion.…”

Section: Introductionmentioning

confidence: 99%

Asymmetric Block Extension of Star‐Shaped [PEG‐SH]₄ – toward Poly(dehydroalanine)‐Functionalized PEG Hydrogels for Catch and Release of Charged Guest Molecules

Kowalczuk,

Mons,

Ulrich

et al. 2023

Macromolecular Bioscience

View full text Add to dashboard Cite

With the incorporation of polyampholytic segments into soft matter, hydrogels can serve as a reservoir for a variety of charged molecules which can be caught and released upon pH change. We herein demonstrate asymmetric block extension of star‐shaped poly(ethylene glycol) [PEG26‐SH]4 using short segments of polyampholytic poly(dehydroalanine) (PDha) while maintaining the functional thiol end groups for network formation. For subsequent hydrogel synthesis with up to 10 wt.% PDha we exploited a straightforward and biocompatible photoinitiated thiol‐ene click reaction. The investigation of the swelling properties of the hydrogel revealed a responsive behaviour towards ionic strength and variations in pH value. Moreover, the reversible adsorption of the model dyes methylene blue (MB) and acid orange 7 (AO7) was investigated by UV/Vis measurements and the procedure could be successfully transferred to the adsorption of the adhesion peptide RGDS resulting in an uptake of 1.5 wt% RGDS in regard to the dry weight of the hydrogel.This article is protected by copyright. All rights reserved

show abstract

Hydrogel sensors with pH sensitivity

Cited by 12 publications

References 50 publications

Self-Stretchable Fiber Liquid Sensors Made with Bacterial Cellulose/Carbon Nanotubes for Smart Diapers

Self-Stretchable Fiber Liquid Sensors Made with Bacterial Cellulose/Carbon Nanotubes for Smart Diapers

Colorimetric hydrogel indicators based on polyvinyl alcohol/sodium alginate for visual food spoilage monitoring

Asymmetric Block Extension of Star‐Shaped [PEG‐SH]₄ – toward Poly(dehydroalanine)‐Functionalized PEG Hydrogels for Catch and Release of Charged Guest Molecules

Contact Info

Product

Resources

About

Hydrogel sensors with pH sensitivity

Cited by 12 publications

References 50 publications

Self-Stretchable Fiber Liquid Sensors Made with Bacterial Cellulose/Carbon Nanotubes for Smart Diapers

Self-Stretchable Fiber Liquid Sensors Made with Bacterial Cellulose/Carbon Nanotubes for Smart Diapers

Colorimetric hydrogel indicators based on polyvinyl alcohol/sodium alginate for visual food spoilage monitoring

Asymmetric Block Extension of Star‐Shaped [PEG‐SH]4 – toward Poly(dehydroalanine)‐Functionalized PEG Hydrogels for Catch and Release of Charged Guest Molecules

Contact Info

Product

Resources

About

Asymmetric Block Extension of Star‐Shaped [PEG‐SH]₄ – toward Poly(dehydroalanine)‐Functionalized PEG Hydrogels for Catch and Release of Charged Guest Molecules