Abstract The objectives of this paper are to review the thermal degradation and stability starch starch‐based materials, including both fundamental sciences such as detecting techniques, effect amylose/amylopectin content in starches modifications, well different processing environments, an open or sealed system, shearless shear stress conditions. decomposition temperature was increased with increasing amylopectin system. In initial water did not affect because all had evaporated from...

A facile and versatile strategy was developed for the preparation of self-healing hydrogels containing double networks both physically chemically cross-linked polymers. The autonomous hydrogel achieved through dynamic bonding physical cross-linking migration ferric ions.

This work describes a study into thiol–ene based Michael addition reactions. Different catalysts, primary and tertiary amines phosphines, were investigated for the reaction of range thiols with dimers oligomers some (meth)acrylates. Primary are efficient catalysts reaction, although these require several hours to reach high conversion. Moreover, phosphine dimethylphenylphosphine (DMPP) tris-(2-carboxyethyl)phosphine (TCEP), in detail. DMPP is an efficacious catalyst yielding complete...

Chitosan without hydrophobic modification is not a good emulsifier itself. However, it has pH-tunable sol-gel transition due to free amino groups along its backbone. In the present work, simple reversible Pickering emulsion system based on of chitosan was developed. At pH > 6.0, as adjusted by NaOH, insoluble in water. nanoparticles or micrometer-sized floccular precipitates were formed situ. These aggregates could adsorb at interface oil and water stabilize o/w emulsions, so-called...

Abstract Polyampholyte hydrogels are synthesized by one‐step copolymerization of cationic monomer 3‐(methacryloylamino)propyltrimethylammonium chloride, anionic monomers sodium p ‐styrenesulfonate (NaSS), and methacrylic acid (MAA) without chemical crosslinker adding salts. The exhibit pH responsive shape memory behavior; the temporary hydrogel is formed manually after immersing in NaOH solution fixed HCl solution, while recovery occurs again. Most interestingly, shows a spontaneous change...

Abstract Freeform optics has become the most prominent element of industry. Advanced freeform optical designs supplementary to ultra-precision manufacturing and metrology techniques have upgraded lifestyle, thinking, observing power existing humans. Imaginations related space explorations, portability, accessibility also witnessed sensible in today’s time with optics. Present-day design methods fabrications applicable development market requirements are focussed explained help traditional...

Redox-responsive gel-sol/sol-gel transition in aqueous PAA system containing Fe(III)-citrate complex was realized by switching the redox states of Fe(III)/F(II) ions conjugated with photoreduction and oxidation. This reversible can be indicated chromatically Fe(III) repeated many times as long there is sufficient citric acid.

ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication the EditorNEXTInverse Molecular Weight Dependence of Cloud Points for Aqueous Poly(N-isopropylacrylamide) SolutionsZhen Tong, Fang Zeng, Xu Zheng, and Takahiro SatoView Author Information Research Institute Materials Science, South China University Technology, Guangzhou 510641, Department Macromolecular Osaka University, Toyonaka, 560, Japan Cite this: Macromolecules 1999, 32, 13, 4488–4490Publication Date (Web):May 29,...

Abstract BACKGROUND: Nanoparticle formulations of pesticides have been proposed to produce a better spatial distribution the pesticide on leaf surfaces, which provides efficiency. Nanoparticles are well studied for drug delivery and sustained release but not in agricultural sciences, because difficulty generating stable nanoparticles with controlled particle size processes generate usually costly. In this paper, model pesticide, bifenthrin, has prepared nanoparticle form by using Flash...

Effective removal of crude oils, petroleum products, organic solvents, and dyes from water is significance in oceanography, environmental protection, industrial production. Various techniques including physical chemical absorption have been developed, but they suffer problems such as low separation selectivity, a complicated lengthy process, well high costs for reagents devices. We present here new material, termed nitrogen-rich carbon aerogels (NRC aerogels,) with highly porous structure...

Facile preparation, rapid actuating, and versatile actions are great challenges in exploring new kinds of hydrogel actuators. In this paper, we presented a facile sticking method to prepare Janus bilayer multilayer actuators that benefited from special tough adhesive PAA-clay hydrogel. Combining physical chemical cross-linking reagents, endowed the PAA gel with both toughness adhesion. This was reinforced by further Fe3+. These two hydrogels different densities exhibited swelling...

Stimulus-responsive hydrogels are utilized as smart materials in actuators for transforming external stimuli into actuation movements. Infrared (IR) irradiation is considered to be an ideal driving energy because it can penetrate biomaterials without direct contact and remotely controlled. In the present work, a new IR-driving bilayer hydrogel actuator prepared by stacking graphene oxide (GO)-hectorite clay-poly(N-isopropylacrylamide) (PNIPAm) gel layer onto hectorite clay-PNIPAm layer,...

Ultralight, fire-resistant, and compressible foams as recyclable oil absorbents are facilely prepared from cheap melamine resins.

Shape memory hydrogels containing over 76 wt % of water were synthesized in a one-pot method, and interpenetrating double network was formed by physically cross-linked gelatin chemically polyacrylamide (PAM) with graphene oxide (GO). The temporary shape quickly fixed cooling ice for 30 s after deformation at 80 °C 10 s. recovery started under near-infrared (NIR) irradiation almost completed within 60 depending on the curling angle. A small amount GO (≤1.5 mg/mL) played key role NIR energy...

Interconnected macroporous foams were synthesized by templating oil-in-water Pickering high internal phase emulsions solely stabilized lignin particles. They exhibited excellent adsorption capacity for copper(II) ions in aqueous solutions.

This paper investigates the throughput for wireless network with full-duplex radios using stochastic geometry. Full-duplex (FD) can exchange data simultaneously each other. On other hand, downside of FD transmission is that it will inevitably cause extra interference to compared half-duplex (HD) transmission. Moreover, residual self-interference has negative effects on throughput. In this paper, we focus a nodes both HD and capabilities derive optimize in such network. Our analytical result...

Vehicle-to-vehicle safety communications based on the dedicated short-range communication technology have potential to enable a set of applications that help avoid traffic accidents. The performance these applications, largely affected by reliability links, stringently ties back MAC and PHY layer design, which has been standardized as IEEE 802.11p. link reliabilities depend signal-to-interference-plus-noise ratio (SINR), which, in turn, depends locations transmit power values transmitting...

Porous scaffolds consisting of bioactive inorganic nanoparticles and biodegradable polymers have gained much interest in bone tissue engineering. We report here a facile approach to fabricating poly(l-lactic acid)-grafted hydroxyapatite (g-HAp)/poly(lactide-co-glycolide) (PLGA) nanocomposite (NC) porous by solvent evaporation Pickering high internal phase emulsion (HIPE) templates, where g-HAp act as particulate stabilizers. The resultant exhibit an open rough pore structure. structure...

A novel dissocyanate-modified lignin xerogel is facilely prepared using renewable as precursors via a sol–gel process and ambient pressure drying method. The possesses high performance in self-cleaning superhydrophobicity with no need for further hydrophobic modification. Furthermore, the obtained can find potential applications absorbents, coatings, scaffolds.

Self-healing hydrogels were proposed to be used as biomaterials, because of the capability spontaneously healing injury, but most reported self-healing do not possess high mechanical strength and fast at same time. Herein, we prepared graphene oxide (GO)-hectorite clay-poly(N,N-dimethylacrylamide) (PDMAA) hybrid with enhanced properties realized by near-infrared (NIR) irradiation. The physical cross-linking between clay sheets PDMAA chains provided hydrogel maintain its stability in shape...