Polymer microstructure

Ebook "Crystallization of nanoscaled colloids" deals with the processes that create ordered assemblies from disordered nanoparticles. Ordered packings of nanoscale particles can exhibit unusual properties. This work investigates the self-assembly of such particles, a process widely employed for the generation of ordered structures, but not yet well understood. In situ methods are used to observe the assembly of sub-micron polymer lattices and sub-10 nm gold particles into crystalline monolayers and aggregates.

138p coduathanh1122 27-03-2024 3 1   Download

Ebook "Polymer physics" introduces the reader to the fascinating field of polymer physics. It is intended to be utilized as a textbook for teaching upper level undergraduates and first year graduate students about polymers. Any student with a working knowledge of calculus, chemistry, and physics should be able to read this book. The essential tools of the polymer physical chemist or engineer are derived in this book without skipping any steps.

458p loivantrinh 29-10-2023 6 2   Download

Ebook "The structure and rheology of complex fluids" describes the microstructures of polymeric, colloidal, amphiphilic, and liquid crystalline liquids, and the relationship between microstructure and mechanical and flow properties. This book provides illustrations, practical examples, and worked problems. It serves as both a textbook for a graduate course and a research monograph.

682p loivantrinh 29-10-2023 10 2   Download

Gellan gels were produced using different approaches forming structures with varied potential applications. Gels were characterized from appearance, mechanical properties, water holding capacity (WHC) and microstructure. In addition, in vitro digestibility of these gels was evaluated to understand the effect of gastrointestinal environment on their structure stability.

7p vihermione 06-01-2023 13 2   Download

Binder jetting is an additive manufacturing technique in which powdered material is sequentially laid down and printed on by an ink binder, in a selective manner, to form a 3D object. Unfortunately work in this area relevant to food materials is largely unpublished, however a typical application of this technique is sugar powder bound by a water and alcohol based ink with optional colour or flavour demonstrated by commercial ventures.

10p vihermione 06-01-2023 5 2   Download

This paper describes the development of cellulose-based aerogel composites enhanced via a new refinement process. The behaviour and microstructure of treated cellulose aerogel composites are examined including, how the constituents interact and contribute to the overall aerogel composite mechanism.

8p vihermione 30-12-2022 38 2   Download

Viscosity is an important rheological property, which may have impact on the glycemic response of starchy foods. However, the relationship between starch gels viscosity on its hydrolysis has not been elucidated. The aim of this work was to assess the effect of gels viscosity on the microstructure, and the kinetics of enzymatic hydrolysis of starch.

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We report on a procedure for the preparation, printing and curing of antibacterial poly(N-isopropylacrylamide) nanocellulose-reinforced hydrogels. These composites present a highly anisotropic microstructure which allows to control and modulate the resulting mechanical properties.

11p viginny 30-12-2022 6 2   Download

Many materials used in a wide range of fields consist of polymers that feature great structural complexity. One particularly suitable technique for characterising these complex polymers, that often feature correlated distributions in e.g. microstructure, chemical composition, or molecular weight, is comprehensive two-dimensional liquid chromatography (LC × LC).

10p viginny 23-12-2022 12 2   Download

Citrus waste includes peels, pulp and membrane residue and seeds, constituting approximately 40–60% of the whole fruit. This amount exceeds ~110–120 million tons annually worldwide. Recent investigations have been focused on developing newer techniques to explore various applications of the chemicals obtained from the citrus wastes. The organic acids obtained from citrus waste can be utilized in developing biodegradable polymers and functional materials for food processing, chemical and pharmaceutical industries.

22p partimesinhvien 08-05-2020 23 1   Download

A combination of gel-casting and polymeric foam infiltration methods is used in this study to prepare porous bodies of hydroxyapatite (HA), to provide a better control over the microstructures of samples. These scaffolds were prepared by impregnating a body of porous polyurethane foam with slurry containing HA powder, and using a percentage of solids between 40% and 50% w/v, and three different types of monomers to provide a better performance.

8p kequaidan1 16-11-2019 8 0   Download

The influence of polymer-modified mortar with fly ash was researched, when lignin cellulose and calcium sulphoaluminate expansive agent was added into mortar. The consistency, mechanical properties and shrinkage performance of mortar were studied by orthogonal experiment. Lignin cellulose was wrapped by the hydration products of binding materials. As the expansive agent and fly ash increasing, the consistency of mortar can be improved.

5p christian2605 11-10-2019 23 1   Download

The decrease in strength of tile adhesive mortars during wet storage was investigated. In a first approach, the water resistance of the polymer phases was tested on structures isolated from the mortar and in situ. It was observed that cellulose ether and polyvinyl alcohol structures are water-soluble. Subsequent investigations on polymer mobility within the mortar showed that the migrating pore water transports cellulose ether and polyvinyl alcohol during periods of water intrusion and drying. This leads to enrichments at the mortar – substrate interface.

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In this study, two types of acrylic latexes, PA (polyacrylate) and PU/PA (polyurethane modified PA), are investigated in their influences on mechanical properties of mortar under different interaction mechanisms. In light of a previous study, the polymer–cement hydrates interaction mechanisms in PA and PU/PA modified mortars are illustrated respectively, and the microstructures are simulated using a computer model.

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Water wetting of a structured multi-layered thin film consisting of bottom silver and top polymer layers microstructured by femtosecond laser pulses was studied. The micro-structure of periodic trenches was ablatively produced on the top polymer layer of this film using 515 nm, 220 fs pulses generated by the second harmonic of an ytterbium-doped fiber laser at the pulse repetition rate of 20 kHz.

6p viryucha2711 24-04-2019 22 0   Download

Learning involves acquiring knowledge, which is encouraged in all traditions. For example, the Quran urges people to seek knowledge and to use it for the well being of society: “My Lord, increase me in knowledge”, Al-Quran 20:114. Knowledge should be applied in a safe, responsible and ethical manner not only to benefi t us personally but also to improve the lot of the people we live with. It is also a duty to ensure that our surrounding habitat is not endangered. Th is sometimes requires knowledge of the local culture to help achieve a desirable outcome.

0p sn_buon 29-11-2012 64 4   Download

Most manufacturing technologies for metallic microstructures have their roots either in semiconductor (inmost cases, silicon) device production or in conventional precision machining. Of these, the techniques that are well known have been used formicrostructure dimensions. Further, they have been adapted and improved to reach the desired precision and surface quality. In some rare cases, itwas possible to use the same manufacturing process for macroscale and microscale devices and to get the desired results.

15p quynho77 13-11-2012 45 2   Download

In this section, fabrication as well as bonding and packaging of microstructure components and devices made from metals and ceramics will be described briefly. Themanufacturing processes of bothmetalmicrostructure components and ceramic microstructure devices will also be described setting the focus on some well- established technologies. The detailed description of all these techniques can, however, be found in Refs [1–5]. A very short bonding section in which the most common bonding and sealing techniques are briefly described will complete the description of metals and ceramics [4,6].

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Polymer micromolding is a common way to ma microchannels, because of the ease of processing, low co and bio-compatibility. Molds with micron-scale featur may be made from photosensitive polymers (e.g., SU-8) by DRIE silicon micromachining. Poly(dimethylsiloxan (PDMS) is often chosen as the microstructural materi [15]. PDMS is spin cast onto the mold, cured and peel off. A short exposure in an oxygen plasma activates t PDMS surface and results in instant bonding to oth PDMS or glass surfaces.

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This book comprises the contributions of several authors in the area of polymer characterization by atomic force microscopy of the polymer network structure formed in Ferroelectric Liquid Crystals Cells; polymerization by microwave irradiation method of starch/acrylic acid/acrylamide; polymerization of olefins; emulsion polymerization; ring opening polymerization; cationic polymerization of vinyl monomers ; block and graft copolymerization by controlled/living polymerization; fabrication of doped microstructures by two-photon polymerization; rheology of biomaterials; plant cell wall ...

436p greengrass304 18-09-2012 254 40   Download