Adsorption of carboxylic modified latex particles at liquid interfaces studied by the gel trapping technique

Al-Shehri, Hamza S.; Horozov, Tommy S.; Paunov, Vesselin N.

doi:10.1039/c4sm01030b

Cited by 13 publications

(22 citation statements)

References 25 publications

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“…For square packing conditions, eqn (25) yields a critical value of y l 0 E 541. Below those critical values eqn (24) and (25) do not have a real physical solution for the porous supra-particle contact angle, y. This means that, if the small particles in the porous supra-particles' surface are so hydrophilic that their contact angle is smaller than B611 or B541, the porous supra-particle pre-filled with oil would transfer completely from the oil phase into the water.…”

Section: Resultsmentioning

confidence: 99%

“…This affects the attachment energy of the supra-particles at the liquid interface and their equilibrium macroscopic contact angle, y, at the liquid surface. One should note that eqn (11)-(13) and (23)- (25) predict different values of the porous supra-particles equilibrium contact angle at the oil-water interface, depending on the fluid phase of origin. These results are not contradictory.…”

Section: Resultsmentioning

confidence: 99%

“…There is no contradiction here. This is due to the fact that the porous supra-particle (or colloidosome) is filled with water in the case of eqn (11)- (13) and with oil in the case of eqn (23)- (25). This is a fundamental result, which differentiates the attachment of composite porous supra-particles or colloidosome capsules from the attachment of the building block solid colloid particles.…”

Section: Since Random Close Packing Area Fraction Is Bracketed In Betmentioning

confidence: 99%

“…The contact angles of the individual colloid particles at air-water and oil-water interfaces were investigated using the gel trapping technique (GTT) [21][22][23][24][25] by injecting a small sample of the particle suspension in a spreading solvent near the liquid interface through the polar or non-polar phase. In a separate series of experiments, the porous supra-particle contact angles were also studied.…”

Section: Introductionmentioning

confidence: 99%

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Attachment of composite porous supra-particles to air–water and oil–water interfaces: theory and experiment

Paunov

Al-Shehri

Horozov

2016

Phys. Chem. Chem. Phys.

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We developed and tested a theoretical model for the attachment of fluid-infused porous supra-particles to a fluid-liquid interface. We considered the wetting behaviour of agglomerated clusters of particles, typical of powdered materials dispersed in a liquid, as well as of the adsorption of liquid-infused colloidosomes at the liquid-fluid interface. The free energy of attachment of a composite spherical porous supra-particle made from much smaller aggregated spherical particles to the oil-water interface was calculated. Two cases were considered: (i) a water-filled porous supra-particle adsorbed at the oil-water interface from the water phase, and, (ii) an oil-filled porous supra-particle adsorbed at the oil-water interface from the oil-phase. We derived equations relating the three-phase contact angle of the smaller "building block" particles and the contact angle of the liquid-infused porous supra-particles. The theory predicts that the porous supra-particle contact angle attached at the liquid interface strongly depends on the type of fluid infused in the particle pores and the fluid phase from which it approaches the liquid interface. We tested the theory by using millimetre-sized porous supra-particles fabricated by evaporation of droplets of polystyrene latex suspension on a pre-heated super-hydrophobic surface, followed by thermal annealing at the glass transition temperature. Such porous particles were initially infused with water or oil and approached to the oil-water interface from the infusing phase. The experiment showed that when attaching at the hexadecane-water interface, the porous supra-particles behaved as hydrophilic when they were pre-filled with water and hydrophobic when they were pre-filled with hexadecane. The results agree with the theoretically predicted contact angles for the porous composite supra-particles based on the values of the contact angles of their building block latex particles measured with the Gel Trapping Technique. The experimental data for the attachment of porous supra particles to the air-water interface from both air and water also agree with the theoretical model. This study gives important insights about how porous particles and particle aggregates attach to the oil-water interface in Pickering emulsions and the air-water surface in particle-stabilised aqueous foams relevant in ore flotation and a range of cosmetic, pharmaceutical, food, home and personal care formulations.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Since Random Close Packing Area Fraction Is Bracketed In Betmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Attachment of composite porous supra-particles to air–water and oil–water interfaces: theory and experiment

Paunov

Al-Shehri

Horozov

2016

Phys. Chem. Chem. Phys.

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“…Nitrogen adsorption–desorption characterization further confirmed that the average pore sizes are 3, 23, and 33 nm, respectively (Figure m and Figure S9, Supporting Information). Furthermore, to study the surface wettability of the particles with heterostructured nanopores, we measured their three phase contact angle (CA, θ) through the gel trapping technique (Supporting Information, Section 7). The three‐phase CAs were calculated from the corresponding SEM images (Figure j–l).…”

mentioning

confidence: 99%

Interfacially Polymerized Particles with Heterostructured Nanopores for Glycopeptide Separation

Song

Fan

et al. 2018

Advanced Materials

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Porous polymer materials are extensively used for biomolecule separation. However, conventional homogeneous porous polymer materials cannot efficiently separate specific low-abundance biomolecules from complex samples. Here, particles fabricated by emulsion interfacial polymerization featuring heterostructured nanopores with tunable size are reported, which can be used to realize low-abundance glycopeptide (GP) separation from complex biofluids. The heterostructured surface inside the nanopores allows solvent-dependent local adsorption of biomolecules onto hydrophilic or hydrophobic regions. Low-abundance hydrophilic GPs in complex biofluids can be efficiently separated via the hydrophilic region of nanopores in low-polarity solvent after the hydrophobic region removes high-abundance hydrophobic proteins and non-glycopeptides in high-polarity solvent. It is expected that these particles with heterostructured nanopores can be used for separation of nucleic acids, saccharides, and proteins, and downstream clinical diagnosis.

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Bioimprint Mediated Label‐Free Isolation of Pancreatic Tumor Cells from a Healthy Peripheral Blood Cell Population

et al. 2020

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tumor to early metastasize and spread [5] and even the smallest primary lesions often show perineural and lympho-vascular invasion. [6] More recently, the 5-year survival rates have improved slightly but differs from country to country, based on management approaches such as early surgical removal, stage, absence of lymph node metastasis. Worldwide, survival is generally around 5% [2] and it is the fifth most common cause of cancer death in the UK [7] and Europe. [8] In the U.S, PC is the fourth leading cause of cancer death [9] and second most common gastrointestinal malignancy. Surgical resection of the tumor is associated with the best patient outcomes but as stated above due to early tumor spread this is not an option in many cases. Pancreatic cancer is a malignancy that is very difficult to detect early, it is rarely cured (less than 1%) and even small tumors have often metastasized early to the liver. [10] This is preceded by release of circulating tumor cells (CTCs) which spread to the patients organs through the peripheral blood circulatory system. [11,49] Pancreatic CTCs can be used as a biomarker for potential earlier detection of cancer [12] however, there is no proven technology which could capture and detect these cells. [12-14] CTCs usually have oval shapes within the blood and there are size and shape differences between the pancreatic tumor cells and normal blood cells, which allows the latter to be selectively targeted by cell shape recognition. These features may potentially allow pancreatic CTCs to be extracted from blood samples by cell shape and size recognition using bioimprints produced for these specific types of cells. Available methods for the collection or detection of CTCs take advantage of various physical properties of the target cells and their surfaces. [15-24] Bioimprints have recently been recognized for their great potential for biomedical diagnostics and targeted therapies as they can effectively capture cells of specific shape and morphology, isolating them or delivering biocides directly to their surface. [25-27] Bioimprints are exact physical copies of the surface of a cell layer which can be produced by impressing the cells with a layer of curable polymer or other material. [25,27-29] The bioimprinting process produces a polymeric cast of the whole cell layer, producing a negative replica of the cells shape New techniques are required for earlier diagnosis and response to treatment of pancreatic cancer. Here, a label-free approach is reported in which circulating pancreatic tumor cells are isolated from healthy peripheral blood cells via cell bioimprinting technology. The method involves pre-fabrication of pancreatic cell layers and sequential casting of cell surfaces with a series of custom-made resins to produce negative cell imprints. The imprint is functionalized with a combination of polymers to engineer weak attraction to the cells which is further amplified by the increased area of contact with the matching cells. A flow-through bioimprint chip is designed and tested...

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Adsorption of carboxylic modified latex particles at liquid interfaces studied by the gel trapping technique

Cited by 13 publications

References 25 publications

Attachment of composite porous supra-particles to air–water and oil–water interfaces: theory and experiment

Attachment of composite porous supra-particles to air–water and oil–water interfaces: theory and experiment

Interfacially Polymerized Particles with Heterostructured Nanopores for Glycopeptide Separation

Bioimprint Mediated Label‐Free Isolation of Pancreatic Tumor Cells from a Healthy Peripheral Blood Cell Population

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