摘要:
This disclosure demonstrates a new method to produce three dimensional multiphasic structures, including bijels, via vapor-induced phase separation (VIPS). In VIPS, the evaporation of the co-solvent from a ternary mixture of oil, water and ethanol, induces phase separation. Particles present in the mixture attach to the interface and arrest the phase separation between water and oil. VIPS enables, inter alia, the fabrication of films and coatings via spreading or spraying particle-laden suspension onto a surface without the need for an outer aqueous phase.
摘要:
The present invention concerns a method for producing a hydrogel comprising the following steps in succession: a first step (i) of providing at least one powder of an anionic polymer (A) and at least one chitosan powder (B) comprising amine functions (—NH2); a second step (ii) consisting in dry mixing at least the powders (A) and (B) from the first step in order to form a mixture of powders; a third step (iii) of suspending the mixture of powders obtained from the second step in an aqueous medium having a pH that can enable the anionic polymer (A) to be dissolved without dissolving the chitosan (B); a fourth step (iv) of adding an acid to the suspension obtained from the third step in order to form the hydrogel; or the third (iii) and fourth (iv) steps are replaced by a mixing fifth step (v), comprising mixing an acidified aqueous medium including at least one compound (C) comprising at least one unit of a hexose or a unit derived from a hexose, and/or at least one phosphate of said compound (C), with said mixture comprising at least the powders (A) and (B) obtained from the second step (ii).
摘要:
It is an object of the invention to provide an economically viable process for the production of hydrophobized aerogels which works both inexpensively and in a resource-conserving manner. 2.2. This object is achieved by the provision of a process for producing organically modified aerogels by producing a sol containing [SiO4/2] units and [RxSiO(4−X)/2] a units, where x may be the same or different and is 1, 2 or 3, and R may be the same or different and is hydrogen or an organic substituted or unsubstituted radical, using the sol to form a gel, surface-modifying the gel obtained in the presence of more than 0.1% by weight of a phase modifier in a mixture comprising organosiloxane and initiator, wherein the mixture contains at least 20% by weight of organosiloxane and wherein the initiator consists of acid or organosiloxane or mixtures thereof and the gels obtained are dried. 2.3. The aerogels provided can be used as insulating materials, especially in thermal insulation.
摘要:
There is provided a method for preparing a dense hydrogel comprising providing an at least partially gelled hydrogel, placing the at least partially gelled hydrogel in fluid communication with an end of a capillary, and driving the at least partially gelled hydrogel into the capillary to form a dense hydrogel. There is also provided a system for preparing the dense hydrogel comprising a capillary having a bore; and a driver in communication with an end of the capillary for driving an at least partially gelled hydrogel into the bore of the capillary to form a dense hydrogel.
摘要:
The invention provides a biocompatible carrier and method for fabricating the same. The biocompatible carrier includes: a gel, and a plurality of metal nanoparticles, an organic compound or combinations thereof embedded in the gel, wherein the metal nanoparticles, the organic compound or combinations thereof are uniformly distributed in the gel.
摘要:
A method for strengthening a hydrogel of a naturally-occurring gelling agent, or a derivative thereof, including the step of adding at least one glycol to the gelling agent of the general formula: HO—(CH2)n—OH, HO—(CH2—CH2O)x—H, HO—(CH2—CH2—CH2O)y—H; and, HO—(CH2—CH[CH3]—O)y—H, in which, n is from 2 to about 8; x is from 6 to about 30; and, y is from 4 to about 20. Also useful of those of the general structure: HO—[C(R1)(R2)—C(R3)(R4)]—OH, in which, R1, R2, R3, R4 are capable of being —H in all four positions, or H in 0, 1, 2, 3 positions and —CH3 or —C2H5 in any or all of the non-H occupied positions. Further, 1,2-propylene glycol and its ether derivatives, having only secondary alcohol groups, are particularly useful, having the general structure: R5O—CH2—CH(CH3)—OR6, in which, either or both R5 and R6 are H or —CH2—CH(OH)—CH3.
摘要:
Dried amorphous aluminum hydroxide gels having substantial acid reacting capability over an extended period of time are prepared by drying the gel after contacting the aqueous liquid gel with an inert organic solvent of sufficient solubility in water to replace water in the gel. The dried gel product and pharmaceutical compositions comprising the gel are also novel.
摘要:
Stable dried aluminum hydroxide gels possessing the high acid reactivity of liquid aluminum hydroxide gel are prepared by drying the gel from non-aqueous solvents.