All‐Silica Submicrometer Colloidosomes for Cargo Protection and Tunable Release

Abstract

Colloidosomes have received considerable attention for the controlled delivery of active ingredients in medicine, agrochemicals, and cosmetics. However, most reported colloidosomes are highly permeable and size is larger than 1 μm. All silica colloidosomes have now been prepared with adjustable size, compact shell and low permeability. Our approach is based on the formation of inverse water-in-oil (w/o) emulsions stabilized solely by hydrophobic silica nanoparticles and subsequent locking of the particle at the oil-water interface by a simple sol-gel reaction of silica precursor at room temperature. The colloidosomes obtained display a robust and closed shell, ensuring a long-term retention of small hydrophilic molecules such as Methylene Blue. Remarkably, unlike all other reported silica colloidosomes, a timely and stepwise release of the encapsulated cargo can be triggered by adding ethanol or surfactant without destroying the capsule shell.

Liquid marble-derived solid-liquid hybrid superparticles for CO2 capture

“…Such a drastically reduced amine loss should be attributed to the unique structure of SLHSP, in which the hydrophobic shell prevented the hydrophilic TEPA molecules from passing through (Fig. 6f) 49 . Encouraged by the above results, we further examined multiple cycles in the presence of moisture.…”

“…More interestingly, superparticles as large as 2 mm were achieved through vibrating the needle of syringe pump. It is worthwhile to emphasize that such a wide size range is essential in practical applications though remains very challenging to achieve using other currently existing methods 49 . The SLHSPs also displayed different sorption kinetics and capacity (Fig.…”

Cross-linking of double oil-in-water-in-oil emulsions: A new way for fragrance encapsulation with tunable sustained release

“…Alternatively, the pressure could be released and the liquid remaining outside analyzed by GC ( Figure 20 The comparison of the proposed capsules with all the existing ones without focus on the goal and application is just an impossible task in the frame of an original paper. Therefore, the ambitious of this paragraph is limited to a comparison with some recent and novel systems [19,20,23,39,40,[52][53][54][55][56][57][58][59][60][61][62][63]] that aims at reducing or avoiding the use of formaldehyde, most of them being core-shell capsules. Also depending on the considered application, either a provoked sudden release of the cargo is aimed at [19,20,[54][55][56][60][61][62] or, on the contrary, a slow and sustained released is preferred or observed as it was the goal herein [39,40,52].…”

“…Pickering emulsions that is to say emulsions stabilized by particles are known to be very stable kinetically. In order to improve their tightness or mechanical properties the emulsion surface may be reinforce either by polymers that serve as a mortar [55], by polymerization at the interface [57] or by in-situ synthesis of a silica shell [19,20,54,[60][61][62][63][64][65].…”

“…This means that there is no interface between the internal and external fluids and it allows the colloidosome permeability to be controlled by the interstitial holes. A recent example of colloidosomes is given by ref [63]. Another point that can be mentioned is the fact that most often the encapsulated species is a unique and model molecules used to represent a fragrance [23,[52][53][54]56,60,63].…”