10 research outputs found
Citric acid-based degradable polyester elastomers coated with silver nanowires for sustainable soft sensors
Although soft electronic materials are of significant importance for flexible electronic devices, most of them are derived from commercial polymer elastomers, such as polydimethylsiloxane, polyurethane and Ecoflex. In this work, citric acid-based degradable polyester elastomers are prepared by a melt polycondensation process, utilizing citric acid, 1,8-octanediol and poly(ethylene glycol) (PEG) as monomers. Furthermore, poly(1,8-octanediol citrate acid) (POC)-PEG/silver nanowire (AgNW) conductive polyester elastomers (CPEs) are prepared by introducing a AgNW layer on the surface of the POC-PEG films. Scanning electron microscopy images reveal that the thickness of the AgNW layer is on the scale of several micrometers and the AgNWs form a continuous conductive network. Upon mechanical stimuli, POC-PEG exhibits recoverable deformation and induces variation in the AgNW conductive network, resulting in a conversion of strain to detectable resistance. When tensile strain is applied, the POC-PEG/AgNW CPEs achieve a gauge factor of 231.6, a response range of 0%-50%, a low response time of 35 ms and high stability. Moreover, the POC-10PEG/AgNW CPE also responds to bending deformation with a gauge factor of 3667.5, a response range of 0%-8.4%, a low response time of 62 ms and high stability. On the basis of strain sensitivity, wireless sensors are further assembled by integrating the POC-PEG/AgNW CPEs into a Bluetooth signal transmission system. Various human motions and physiological activities are successfully monitored using the wireless sensors. The results demonstrate that degradable citric acid-based polyester elastomers/AgNW CPEs are promising materials for next-generation sustainable and flexible electronic devices
Immune RBF network and its application in the modulation-style recognition of radar signals
Some issues about the textile conservation works at Museu Paulista, USP
Este ensaio apresenta as principais idéias e metodologia que têm orientado os trabalhos de Conservação de Têxteis Históricos no Museu Paulista da Universidade de São Paulo. Através dessa discussão específica, todavia, é repensado o papel da conservação/restauração de bens culturais frente à sensibilidade, atitude e ideário deste fim de milênio.This paper presents the main ideas and method which have been guiding the textile conservation works at Museu Paulista, Universidade de São Paulo. Through this specific discussion, however, the author reconstructs the role of conservation/restoration of cultural heritage related with the sensibility, atittude and ideas brought by the end of the millennium
Dually Synergetic Network Hydrogels with Integrated Mechanical Stretchability, Thermal Responsiveness, and Electrical Conductivity for Strain Sensors and Temperature Alertors
The
first example of dually synergetic network hydrogel, which has integrated
mechanical stretchability, thermal responsiveness, and electrical
conductivity, has been constructed by a versatile and topological
co-cross-linking approach. Poly(<i>N</i>-isopropylacrylamide)
(PNIPAAm) is introduced as the thermally responsive ingredient, and
polyaniline (PANI) is selected as the electrically conductive ingredient.
PNIPAAm network is cross-linked by double-bond end-capped Pluronic
F127 (F127DA). PANI network is doped and cross-linked by phytic acid.
These two ingredients are further mechanically interlocked. Due to
the integrated multiple functionalities, the topologically co-cross-linked
hydrogels, as will be mentioned as F-PNIPAAm/PANI hydrogels, can be
fabricated into resistive-type strain sensors. The strain sensors
can achieve a gauge factor of 3.92, a response time of 0.4 s, and
a sensing stability for at least 350 cycles and can be further applied
for monitoring human motions, including motion of two hands, bending
of joints, and even swallowing and pulse rate. Moreover, F-PNIPAAm/PANI
hydrogels are utilized to construct efficient temperature alertors
based on the disconnection of circuits induced by volume shrinkage
at high temperature
Dually Synergetic Network Hydrogels with Integrated Mechanical Stretchability, Thermal Responsiveness, and Electrical Conductivity for Strain Sensors and Temperature Alertors
The
first example of dually synergetic network hydrogel, which has integrated
mechanical stretchability, thermal responsiveness, and electrical
conductivity, has been constructed by a versatile and topological
co-cross-linking approach. Poly(<i>N</i>-isopropylacrylamide)
(PNIPAAm) is introduced as the thermally responsive ingredient, and
polyaniline (PANI) is selected as the electrically conductive ingredient.
PNIPAAm network is cross-linked by double-bond end-capped Pluronic
F127 (F127DA). PANI network is doped and cross-linked by phytic acid.
These two ingredients are further mechanically interlocked. Due to
the integrated multiple functionalities, the topologically co-cross-linked
hydrogels, as will be mentioned as F-PNIPAAm/PANI hydrogels, can be
fabricated into resistive-type strain sensors. The strain sensors
can achieve a gauge factor of 3.92, a response time of 0.4 s, and
a sensing stability for at least 350 cycles and can be further applied
for monitoring human motions, including motion of two hands, bending
of joints, and even swallowing and pulse rate. Moreover, F-PNIPAAm/PANI
hydrogels are utilized to construct efficient temperature alertors
based on the disconnection of circuits induced by volume shrinkage
at high temperature
Additional file 2 of A simplified multiplex methylated DNA testing for early detection of colorectal cancer in stool DNA
Additional file 2: Supplemental Tables
Additional file 1 of A simplified multiplex methylated DNA testing for early detection of colorectal cancer in stool DNA
Additional file 1: Supplemental Figure