A bacterial cellulose-polyurethane composite material, preparation method, and use are described. The preparation method comprises: performing organic solvent exchange on bacterial cellulose microfibers, and obtaining bacterial cellulose microfiber composite substance A and composite substance B of different concentrations; under oil bath conditions, adding a polymer polyol and a diisocyanate compound and performing an addition polymerization reaction, obtaining, via the reaction, a bacterial cellulose composite polyurethane foam prepolymer; and subsequently performing curing and obtaining the bacterial cellulose-polyurethane composite material. By combining bacterial cellulose microfibers and polyurethane foam material, the mechanical properties of the composite material are significantly improved; the large amount of hydroxyl groups on the surfaces of the bacterial cellulose nanofibers effectively strengthens the hydrophilicity and water absorption capability of the composite material; and the favorable tissue affinity of bacterial cellulose can also improve the biocompatibility of polyurethane material.

An electronic device element is described which is flexible, bendable or twistable without substantial degradation in optical or electrical properties. The electronic device element includes an optically transparent film constructed of a recombinant re-silin-CBD protein bound to cellulose nanocrystals (CNC). The recombinant resilin-CBD protein includes a Clostridium-derived cellulose-binding domain fused to resilin. The electronic device element may be a flexible display or flexible electronics element.

The present invention provides compositions, and related kits and methods, for formation of hydrogels. The compositions comprise one or more chemically crosslinkable agents dissolved in an aqueous solution to form a precursor solution. The chemically crosslinkable agents useful in the present invention are selected from polymers modified with a molecule selected from acrylate, maleimide, vinylsulfone, N-hydroxysuccinimide, aldehyde, ketone, carbodiimide, carbonate, iodoacetyl, mercaptonicotinamide, quinone, thiol, amine, and combinations thereof. The precursor solution is characterized as being in an aqueous form at a non-physiologic physical-chemical condition and undergoing gelation when in contact with another fluid or body at a physiologic physical-chemical condition.

Provided is a novel cyclic oligosaccharide derived from cellulose. The cyclic oligosaccharide is a cyclic oligosaccharide of Formula (1) having a β-1,4 glucosidic bond. In the formula, R represents a hydrogen atom or a substituent thereof, a plurality of the Rs may be identical or different, and n represents an integer of 0 to 3.

Provided is a novel cyclic oligosaccharide derived from cellulose. The cyclic oligosaccharide is a cyclic oligosaccharide of Formula (1) having a β-1,4 glucosidic bond. In the formula, R represents a hydrogen atom or a substituent thereof, a plurality of the Rs may be identical or different, and n represents an integer of 0 to 3.

A method of making a proppant-gel matrix comprising: a) hydrating a gelling agent to form a hydrated gelling agent; b) adding a basic compound to the hydrated gelling agent to form a basic hydrated gelling agent having a pH in the range of 11.5 to 14.0; c) mixing the basic hydrated gelling agent and a proppant to form a basic hydrated gelling system; and d) adding a crosslinking agent to the basic hydrated gelling system to form the proppant-gel matrix, is disclosed. The proppant-gel matrix can then be used as a fracturing fluid in a hydraulic fracturing process.

A viscous composition of the present invention comprises specific cellulose fibers (A), (A′) and (A″) and the specific cellulose fibers (A), (A′) and (A″) are used with appropriate selection according to uses of a cosmetic composition, a gel-like composition and a spray composition. Therefore, in case where the composition is used as the cosmetic composition, a cosmetic composition which is excellent in shape retention ability and dispersion stability and excellent in water tolerance to satisfy the properties and the performance which is necessary for cosmetics is obtained. Additionally, in case where the composition is used as a gel-like composition, gel-state can be kept without separation or water release. Furthermore, in case where the composition is used as a spray composition, since it is possible to time-dependently keep stable gel state even if functional additives such as electrolytes, ionic substances, etc. are contained, it is possible to mix various functional additives which is necessary for the use without any problem.

A process for preparing a cellulosic sponge includes the steps of treating an aqueous suspension of cellulose fibers with periodate; adjusting the pH of the resulting dialdehyde cellulose fibers suspension to a value between 2.5 to 5.5; freezing the suspension obtained and thawing the three dimensional structure to render the cellulosic sponge. The process may further include a step of drying to render a cellulosic foam. Both the new sponge and the new foam may also be further chemically modified obtaining a broad variety of derivatives with tailored properties which are useful in many different applications.

A process for preparing a cellulosic sponge includes the steps of treating an aqueous suspension of cellulose fibers with periodate; adjusting the pH of the resulting dialdehyde cellulose fibers suspension to a value between 2.5 to 5.5; freezing the suspension obtained and thawing the three dimensional structure to render the cellulosic sponge. The process may further include a step of drying to render a cellulosic foam. Both the new sponge and the new foam may also be further chemically modified obtaining a broad variety of derivatives with tailored properties which are useful in many different applications.

In a method for preparing nanofibrillar cellulose, fibrous dispersion of ionically charged cellulose is repeatedly passed through a mechanical process of disrupting fibers into fibrils until the viscosity starts to decrease. The number average diameter of the nanofibrillar cellulose after the mechanical process is in the range of 2-10 nm, and the zero-shear viscosity is below 10 Pa.Math.s, preferably below 1 Pa.Math.s, when measured in the concentration of 0.5 wt-%. The nanofibrillated cellulose is low aspect ratio nanofibrillated cellulose (NFC-L).