MWCNT/rGO/natural rubber latex dispersions for innovative, piezo-resistive and cement-based composite sensors

AbstractThe present study is focused on the development and characterization of innovative cementitious-based composite sensors. In particular, multifunctional cement mortars with enhanced piezoresistive properties are realized by exploiting the concept of confinement of Multiwall Carbon Nanotubes (MWCNTs) and reduced Graphene Oxide (rGO) in a three-dimensional percolated network through the use of a natural-rubber latex aqueous dispersion. The manufactured cement-based composites were characterized by means of Inelastic Neutron Scattering to assess the hydration reactions and the interactions between natural rubber and the hydrated-cement phases and by Scanning Electron Microscopy and X-Ray diffraction to evaluate the morphological and mineralogical structure, respectively. Piezo-resistive properties to assess electro-mechanical behavior in strain condition are also measured. The results show that the presence of natural rubber latex allows to obtain a three-dimensional rGO/MWCNTs segregate structure which catalyzes the formation of hydrated phases of the cement and increases the piezo-resistive sensitivity of mortar composites, representing a reliable approach in developing innovative mortar-based piezoresistive strain sensors.

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MWCNT/rGO/natural rubber latex dispersions for innovative, piezo-resistive and cement-based composite sensors

10.21203/rs.3.rs-234097/v1 ◽

2021 ◽

Author(s):

Letizia Verdolotti ◽

Chiara Santillo ◽

Gennaro Rollo ◽

Giovanni Romanelli ◽

Marino Lavorgna ◽

...

Keyword(s):

Natural Rubber ◽

Inelastic Neutron Scattering ◽

Three Dimensional ◽

Natural Rubber Latex ◽

Aqueous Dispersion ◽

Conductive Filler ◽

Inelastic Neutron ◽

Multiwall Carbon Nanotube ◽

Rubber Latex ◽

Electron Scanning Microscopy

Abstract The present study is focused on the development and characterization of innovative cementitious-based composite sensors. In particular, multifunctional cement mortar composites with enhanced functional, piezo-resistive, properties are designed with Multiwall Carbon Nanotube-MWCNTs and reduced Graphene Oxide-rGO dispersed in a natural-rubber latex aqueous dispersion, by exploiting both the concept of confining of the conductive filler in the polymeric phase. The manufactured cement-based composites were characterized by means of Inelastic Neutron Scattering to assess the hydration reactions and the interactions of natural rubber with the hydrated cement phases and by Electron Scanning Microscopy and X-Ray diffraction to evaluate the morphological and mineralogical structure, respectively. Piezo-resistive properties to assess electro-mechanical behavior in strain condition are also measured. The results show that the presence of natural-rubber latex permits to obtain a three-dimensional rGO/MWCNTs segregate structure which catalyzes the formation of hydrated phases of the cement and increases the piezo-resistive sensitivity of mortar composites, representing a reliable approach in developing innovative mortar-based piezoresistive strain sensors.

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Investigation of the co-coagulation of natural rubber latex and cellulose nanocrystals aqueous dispersion

Colloids and Surfaces A Physicochemical and Engineering Aspects ◽

10.1016/j.colsurfa.2019.123949 ◽

2019 ◽

Vol 583 ◽

pp. 123949 ◽

Cited By ~ 5

Author(s):

Tizazu H. Mekonnen ◽

Tracyl Ah-Leung ◽

Sassan Hojabr ◽

Richard Berry

Keyword(s):

Natural Rubber ◽

Cellulose Nanocrystals ◽

Natural Rubber Latex ◽

Aqueous Dispersion ◽

Rubber Latex

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Preparation of multiwall carbon nanotubes (MWCNTs) stabilised by highly branched hydrocarbon surfactants and dispersed in natural rubber latex nanocomposites

Colloid & Polymer Science ◽

10.1007/s00396-014-3354-1 ◽

2014 ◽

Vol 292 (11) ◽

pp. 3013-3023 ◽

Cited By ~ 27

Author(s):

Azmi Mohamed ◽

Argo Khoirul Anas ◽

Suriani Abu Bakar ◽

Azira Abd. Aziz ◽

Masanobu Sagisaka ◽

...

Keyword(s):

Carbon Nanotubes ◽

Natural Rubber ◽

Natural Rubber Latex ◽

Multiwall Carbon Nanotubes ◽

Rubber Latex ◽

Multiwall Carbon

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Diclofenac Potassium Transdermal Patches Using Natural Rubber Latex Biomembranes as Carrier

Journal of Materials ◽

10.1155/2015/807948 ◽

2015 ◽

Vol 2015 ◽

pp. 1-7 ◽

Cited By ~ 11

Author(s):

Natan Roberto de Barros ◽

Paulo Augusto Marques Chagas ◽

Felipe Azevedo Borges ◽

Jose Lucio Padua Gemeinder ◽

Matheus Carlos Romeiro Miranda ◽

...

Keyword(s):

Natural Rubber ◽

Low Cost ◽

Natural Rubber Latex ◽

Mechanical Resistance ◽

X Ray Diffraction ◽

Rubber Latex ◽

Double Exponential ◽

Transdermal Drug Delivery Systems ◽

Hydrogen Bound ◽

Kinetics Of

The aim of this study was to design a compound transdermal patch containing diclofenac potassium (Dic-K) using natural rubber latex (NRL) biomembrane. The NRL from Hevea brasiliensis is easily manipulated and low cost and presents high mechanical resistance. It is a biocompatible material which can stimulate natural angiogenesis and is capable of adhering cells on its surface. Recent researches have used the NRL for Transdermal Drug Delivery Systems (TDDSs). Dic-K is used for the treatment of rheumatoid arthritis and osteoarthritis and pain relief for postoperative and posttraumatic cases, as well as inflammation and edema. Results showed that the biomembrane can release Dic-K for up to 216 hours. The kinetics of the Dic-K release could be fitted with double exponential function. X-ray diffraction and Fourier Transform Infrared (FTIR) spectroscopy show some interaction by hydrogen bound. The results indicated the potential of the compound patch.

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Effect of Modified Natural Rubber on Morphology, Chemical Structure, and Crystallinity of Electrospun Polyvinylidene Difluoride Nanofibers

Materials Science Forum ◽

10.4028/www.scientific.net/msf.950.128 ◽

2019 ◽

Vol 950 ◽

pp. 128-132

Author(s):

Jean Raynell S. Bello ◽

Bryan B. Pajarito ◽

Jem Valerie D. Perez

Keyword(s):

Natural Rubber ◽

Chemical Structure ◽

Fiber Diameter ◽

Natural Rubber Latex ◽

X Ray Diffraction ◽

Rubber Latex ◽

Polyvinylidene Difluoride ◽

X Ray ◽

Chemically Modified ◽

Enzymatic Deproteinization

Natural rubber latex was chemically modified by enzymatic deproteinization, degradation, and epoxidation to produce deproteinized liquid epoxidized natural rubber (DP-LENR). Polyvinylidene difluoride (PVDF) was blended with DP-LENR and then electrospun to produce nanofibers. Scanning electron microscopy shows reduction in the fiber diameter and beading formation with increasing concentration of DP-LENR. Smooth surface of nanofibers suggests miscibility and chemical compatibility of PVDF with low concentration of DP-LENR. Infrared spectroscopy and X-ray diffraction analysis show the addition of DP-LENR has no effect on chemical structure and crystallinity of electrospun PVDF.

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Effect of Starch Nanocrystals on Natural Rubber Latex Vulcanizate Properties

Progress in Rubber Plastics and Recycling Technology ◽

10.1177/147776061803400201 ◽

2018 ◽

Vol 34 (2) ◽

pp. 75-87 ◽

Cited By ~ 1

Author(s):

K Anand ◽

Siby Varghese ◽

Thomas Kurian ◽

Suryasarathi Bose

Keyword(s):

Light Scattering ◽

Natural Rubber ◽

Corn Starch ◽

Natural Rubber Latex ◽

Barrier Properties ◽

X Ray Diffraction ◽

Rubber Latex ◽

X Ray ◽

Starch Nanocrystals

The incorporation of bio-nanofillers such as starch nanocrystals (SNC) in polymer matrices received much attention owing to their biodegradable nature. In this work, starch nanocrystals have been isolated from modified corn starch by acid hydrolysis and their efficacy as a potential bio-filler for natural rubber latex (NR) has been explored. The quality of the SNC suspension was confirmed from dynamic light scattering (DLS) studies and X-ray diffraction (XRD) measurements. For the fabrication of nanocomposites of NR with corn starch crystals, a simple latex stage mixing procedure was employed. The platelet-like morphology of corn starch nanocrystals improved the barrier properties of NR based vulcanizates with the addition of the SNC suspension.

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Aqueous Dispersion of Rice Husk Powder as a Compatible Filler for Natural Rubber Latex Foam

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.626.530 ◽

2012 ◽

Vol 626 ◽

pp. 530-536 ◽

Cited By ~ 4

Author(s):

Shamala Ramasamy ◽

Hanafi Ismail ◽

Yamuna Munusamy

Keyword(s):

Particle Size ◽

Natural Rubber ◽

Rice Husk ◽

Agricultural Waste ◽

Natural Rubber Latex ◽

Aqueous Dispersion ◽

Silica Content ◽

Rubber Latex ◽

Particle Size Analyzer ◽

Acidic Nature

Rice husk powder (RHP) which is a fibrous agricultural waste is widely used as potential filler, novel adsorbent or coating for dry polymers. However, the compatibility of RHP with natural rubber latex (NRL) is yet to be studied. The main goal of this reported work was to create a method to incorporate RHP with NRL and achieve a compatible dispersion. However the amorphous silica content (acidic nature) in RHP makes it difficult to directly incorporate RHP to NRL compound. In this research, RHP was modified by adding ammonia, distilled water and dispersing agents to make an aqueous compatible alkaline dispersion for NRL. Also the particle size of RHP is reduced up to - 300micron to make it more compatible with the NRL. The compatibility of modified RHP is analyzed by sedimentation with time, particle size analyzer, pH and morphology study. The test results supports that modified RHP is more compatible with the NRL compound to obtain a stable foam in NRLF preparation.

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