Wearable porous PDMS layer of high moisture permeability for skin trouble reduction

Abstract

The present research proposes the present porous polydimethylsiloxane (PDMS) layer for the skin trouble reduced daily life skin attachable devices. The present research proposes the new pores forming method in the PDMS by crystallization and dissolution of the citric acid in the PDMS for fabricating high uniform and small size pores. The present porous PDMS layer (i) decreases the pore size 93.2%p and increases the pore size uniformity 425%p compared to the conventional porous PDMS layer of mixing sugars and PDMS; (ii) is able to be fabricated in the thickness of 21–101 µm by spin-coating; (iii) has the 2.2 times higher water vapor transmission rate (947 ± 10.8 g/day•m2) compared to the human skin water vapor transmission rate. The present porous PDMS layer reduces the skin trouble effectively by having the high water vapor permeability, therefore is applicable to the human daily-life skin attachable devices.

Au@Ag Nanorods‐PDMS Wearable Mouthguard as a Visualized Detection Platform for Screening Dental Caries and Periodontal Diseases

“…Au@Ag NR was selected as the visual plasmonic nanoprobe for our wearable mouthguard on account of its good biocompatibility [28,29] and highly sensitive color change in response to H 2 S. [30,31] PDMS was used as the base material due to its softness, superb optical transparency, outstanding elasticity, and stable chemical properties. [32] Moreover, PDMS has a porous structure that allows gases to pass through, [33][34][35] making it an ideal matrix for gas sensing. [27] The preparation process of the Au@Ag NRs-PDMS composite containing plasmonic Au@Ag NRs is shown in Figure 1Ai, and the corresponding ultraviolet-visible (UV-vis) absorption spectra of Au NRs, Au@Ag NRs, sulfhydryl methoxypoly(ethylene glycol) (mPEG)modified Au@Ag NRs, and Au@Ag NRs-PDMS composite are presented in Figure 1Ai as well.…”

Discharge Performance of the Non-rechargeable Lithium-air Batteries with a Waterproof and Breathable Film in an Open Environment

“…Due to the Si-O-Si bond angle can vary in a wide range (130~160°), the molecular chain of polysiloxane is highly curled spiral structure, and the intermolecular force is very weak, thus forming a large free volume, which is conducive to the diffusion of oxygen. Furthermore, due to the water vapor permeation coefficient of PDMS is 2.0*10 -4 cm 3 (STP) cm/cm 2 •s•cmHg, 24 and the corrosion of lithium electrode caused by moisture entering from the air is greatly reduced while the oxygen quantity is ensured.…”

Skin‐Integrated Devices with Soft, Holey Architectures for Wireless Physiological Monitoring, With Applications in the Neonatal Intensive Care Unit

“…Just as the holes and microchannels facilitate permeation of water to the device-skin interface to trigger release of adhesion, permeation of moisture away from this interface via similar mechanisms can avoid the development of a moist environment in which fungi and bacteria can reproduce and cause allergic dermatitis. [26,27] The results in Figure 5a summarizes measurements of that involve placing a device on top of a sample of fully hydrated hydrogel bonded to a glass slide and measuring the amount of weight of water lost by evaporation as a function of time (Figure S22, Supporting Information). For the nonholey device, evaporation can only occur at the perimeter.…”

“…[23][24][25] Additional aspects of this design include 1) visual access to the underlying skin, for clinical inspection for irritation or allergic reactions, and 2) mechanisms for enhanced evaporation of water released through natural transepidermal mechanisms or sweating. [26,27] Precurved shapes tailored to the match the surfaces of desired mounting locations minimize bending forces and corresponding stresses at the skin interface. Systematic studies of devices designed to monitor a full range of conventional and unconventional metrics of physiological health reveal all of the key aspects of these advanced materials and design ideas.…”