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Journal articles on the topic 'Colloidal approaches'

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Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

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1

Lattuada, Marco, and Kata Dorbic. "Polymer Colloids: Moving beyond Spherical Particles." CHIMIA 76, no. 10 (October 26, 2022): 841. http://dx.doi.org/10.2533/chimia.2022.841.

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When thinking about colloidal particles, the fist image that comes into mind is that of tiny little polystyrene spheres with a narrow size distribution. While spherical polymer colloids are one of the workhorses of colloid science, scientists have been working on the development of progressively advanced strategies to move beyond particles with spherical shapes, and prepared polymer colloids with more complex morphologies. This short review aims at providing a summary of these developments, focusing primarily on methods applicable to submicron particles, with an eye towards their applications and some discussion about advantages and drawbacks of the various approaches.

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2

Singh, Sukhbir, Neelam Sharma, Tapan Behl, Bidhan Chandra Sarkar, Hasi Rani Saha, Kanika Garg, Supriya Kamari Singh, et al. "Promising Strategies of Colloidal Drug Delivery-Based Approaches in Psoriasis Management." Pharmaceutics 13, no. 11 (November 22, 2021): 1978. http://dx.doi.org/10.3390/pharmaceutics13111978.

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Psoriasis is a chronic inflammatory autoimmune disorder that moderately affects social and interpersonal relationships. Conventional treatments for psoriasis have certain problems, such as poor drug penetration through the skin, hyper-pigmentation, and a burning sensation on normal and diseased skin. Colloidal drug delivery systems overcome the pitfalls of conventional approaches for psoriasis therapeutics and have improved patient safety parameters, compliance, and superior effectiveness. They also entail reduced toxicity. This comprehensive review’s topics include the pathogenesis of psoriasis, causes and types of psoriasis, conventional treatment alternatives for psoriasis, the need for colloidal drug delivery systems, and recent studies in colloidal drug delivery systems for the treatment of psoriasis. This review briefly describes colloidal drug delivery approaches, such as emulsion systems—i.e., multiple emulsion, microemulsion, and nano-emulsion; vesicular systems—i.e., liposomes, ethosomes, noisomes, and transferosomes; and particulate systems—i.e., solid lipid nanoparticles, solid lipid microparticles, nano-structured lipid carriers, dendrimers, nanocrystals, polymeric nanoparticles, and gold nanoparticles. The review was compiled through an extensive search of the literature through the PubMed, Google Scholar, and ScienceDirect databases. A survey of literature revealed seven formulations based upon emulsion systems, six vesicular drug delivery systems, and fourteen particulate systems reported for antipsoriatic drugs. Based on the literature studies of colloidal approaches for psoriasis management carried out in recent years, it has been concluded that colloidal pharmaceutical formulations could be investigated broadly and have a broad scope for effective management of many skin disorders in the coming decades.

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3

Ujila, Masuri Siti, and Mathieu Sellier. "Effects of Physicochemical Parameters on Colloidal Potentials." Applied Mechanics and Materials 564 (June 2014): 222–27. http://dx.doi.org/10.4028/www.scientific.net/amm.564.222.

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In particle deposition problems, colloidal potentials play an important role in adsorpting the colloidal particles onto the surface of the deposit wall once the colloids arrive in the vicinity of the wall. Therefore it is important to gain understanding of these potentials, in particular, how they are influenced by the problem parameters. With such an understanding, more insights into mitigating the problem can be obtained, and consequently, more effective approaches to tackle the problem can be taken. In this work, we present the effects of particle size, flow temperature and ionic strength of the solution on the colloidal potentials based on numerical analysis. The results support the conclusion that the rate of initial deposition of particles can be reduced if the particle size is smaller, the flow temperature is increased, and the ionic strength is reduced.

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4

Ahmadi-Sénichault, A., V. Canseco, N. Sefrioui-Chaibainou, A. Omari, and H. Bertin. "Displacement of Colloidal Dispersions in Porous Media: Experimental & Numerical Approaches." Diffusion Foundations 7 (June 2016): 53–68. http://dx.doi.org/10.4028/www.scientific.net/df.7.53.

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The main objective of this paper is to give more insight on colloids deposition and re-entrainment in presence of a rough surface. Experiments on retention and release of colloids in a porous medium are first presented. The influence of physicochemical and hydrodynamic conditions is investigated. The experimental results cannot be qualitatively interpreted using the DLVO theory and knowledges at pore scale are then needed. A 3D numerical simulation approach at the pore scale is therefore proposed where the motion of colloids is solved in presence of collector surfaces bearing various kinds of asperities and by taking into account physico-chemical interactions calculated at each time step during colloid movement. It is obviously observed that both deposition and mobilization of particles are dependent on solution chemistry and hydrodynamic conditions and are significantly affected by the form and size of the local roughness of the pore surface. Therefore, depending on solution ionic strength and surface topography, colloids may be adsorbed or not and when a particle is retained an increase of flow strength is then needed to remove it and such an increase is specific to the location of occurrence of the adsorption step. In general, simulation results allow us to explain our experimental results that show that by steeply increasing the flow strength, more and more fractions of particles retained inside the porous medium are released until all particles are removed.

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Li, Zhiwei, Qingsong Fan, and Yadong Yin. "Colloidal Self-Assembly Approaches to Smart Nanostructured Materials." Chemical Reviews 122, no. 5 (November 8, 2021): 4976–5067. http://dx.doi.org/10.1021/acs.chemrev.1c00482.

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6

Wang, Qun. "On colloidal suspension Brownian stability ratios: Theoretical approaches." Journal of Colloid and Interface Science 145, no. 1 (August 1991): 99–107. http://dx.doi.org/10.1016/0021-9797(91)90102-e.

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7

D'Souza, Lawrence, Andreas Suchopar, and Ryan M. Richards. "In situ approaches to establish colloidal growth kinetics." Journal of Colloid and Interface Science 279, no. 2 (November 2004): 458–63. http://dx.doi.org/10.1016/j.jcis.2004.06.086.

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8

Kader, N. Syed Abdul, Nazneen Ansari, Ravi Bharti, Naresh Mandavi, Gyanesh Kumar Sahu, Arvind Kumar Jha, and Harish Sharma. "Novel Approaches for Colloidal Drug Delivery System: Nanoemulsion." Research Journal of Pharmaceutical Dosage Forms and Technology 10, no. 4 (2018): 253. http://dx.doi.org/10.5958/0975-4377.2018.00037.x.

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9

Oncescu, Tatiana, M. Contineanu, and Lucia Meahcov. "Hydrogen evolution from water using CdS as photosensitizer." International Journal of Photoenergy 1, no. 2 (1999): 75–78. http://dx.doi.org/10.1155/s1110662x99000148.

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Colloidal chemical approaches are increasingly utilised for the preparation and stabilization of semiconductor nanoparticles.We prepared a colloidal CdS in excess ofNa2Susing a method described in the literature and determined the particle size from its absorption spectrum by Brus equation. A diameter of about 50Å was calculated. For the stabilization of colloid we choosed from various tested polymers a 1% in weight copolymer (1/1), styrene/maleic anhydride. As redox catalyst we used colloidal Pt obtained “in situ” by irradiaton ofPtCl6K2. We established the role of each of the system partners as: CdS concentration,Na2Sexcess, Pt catalyst concentration, the irradiation time, and the system temperature. We studied the influence of each participant to the hydrogen evolution in order to optimize this system.The formation of nanosize composite particlesCd1−xZnxSshowed an increasing ofH2amount generated under irradiation, in comparison with CdS particles.The results obtained permitted us to calculate the turnover number (TO) of the system.

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10

Choo, K.-H., I.-J. Kang, S.-H. Yoon, H. Park, J.-H. Kim, S. Adiya, and C.-H. Lee. "Approaches to membrane fouling control in anaerobic membrane bioreactors." Water Science and Technology 41, no. 10-11 (May 1, 2000): 363–71. http://dx.doi.org/10.2166/wst.2000.0681.

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Various fouling control methods were investigated for polymeric and ceramic microfiltration membranes in the anaerobic membrane bioreactors where inorganic precipitates and/or fine colloids have been recently known as the most significant foulants: (i) Substantial improvement of flux was achieved by backfeeding of acidic wastewater through the membrane module. The backfeeding mode formed an acidic environment around the membrane pores and thus suppressed struvite formation. (ii) Struvite precipitation was also mitigated when an additional combined dialysis/zeolite unit was attached to the bioreactor. With this combined unit the flux improvement for the ceramic membrane, where struvite had a severer fouling effect, was achieved more significantly than that for the polymeric membrane. (iii) To control the deposition of organics and fine colloids onto the polymeric membrane, powdered activated carbon (PAC) was added into the bioreactor, which gave rise to the reduction of specific cake resistances of biosolids through the sorption and/or coagulation of dissolved and colloidal matter. (iv) The hydrophilic modification of polypropylene (PP) membranes by graft polymerization reduced membrane fouling. Its effectiveness was most substantial at 70% of the degree of grafting, indicating that there was an optimal degree of grafting. This is possibly due to the steric hindrance of grafted polymer chains and the increase in the hydrophilicity of the grafted PP membrane.

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11

Sutherland, Duncan S., Hans Dyrnesli, Gunnar Kl�s, Maria G. D. R. H. Salazar, Kasper R. Okholm, and Vladimir E. Bochenkov. "Colloidal lithography approaches to study plasmon coupling and plasmonicdevices." Journal of Self-Assembly and Molecular Electronics 6, no. 1 (2018): 1. http://dx.doi.org/10.13052/jsame2245-4551.2018029.

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12

Bowen, W. Richard, and Paul M. Williams. "Quantitative predictive modelling of ultrafiltration processes: Colloidal science approaches." Advances in Colloid and Interface Science 134-135 (October 2007): 3–14. http://dx.doi.org/10.1016/j.cis.2007.04.005.

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13

Xu, Wenjing, Zhiwei Li, and Yadong Yin. "Colloidal Assembly Approaches to Micro/Nanostructures of Complex Morphologies." Small 14, no. 35 (July 24, 2018): 1801083. http://dx.doi.org/10.1002/smll.201801083.

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14

Cesaria, Maura, Adriano Colombelli, Daniela Lospinoso, Antonietta Taurino, Enrico Melissano, Roberto Rella, and Maria Manera. "Long- and Short-Range Ordered Gold Nanoholes as Large-Area Optical Transducers in Sensing Applications." Chemosensors 7, no. 1 (March 15, 2019): 13. http://dx.doi.org/10.3390/chemosensors7010013.

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Unconventional lithography (such as nanosphere lithography (NSL) and colloidal lithography (CL)) is an attractive alternative to sequential and very expensive conventional lithography for the low-cost fabrication of large-area nano-optical devices. Among these, nanohole (NH) arrays are widely studied in nanoplasmonics as transducers for sensing applications. In this work, both NSL and CL are implemented to fabricate two-dimensional distributions of gold NHs. In the case of NSL, highly ordered arrays of gold NHs distributed in a hexagonal lattice onto glass substrates were fabricated by a simple and reproducible approach based on the self-assembling of close-packed 500 nm diameter polystyrene particles at an air/water interface. After the transfer onto a solid substrate, the colloidal masks were processed to reduce the colloidal size in a controllable way. In parallel, CL was implemented with short-range ordered gold NH arrays onto glass substrates that were fabricated by electrostatically-driven self-assembly of negatively charged colloids onto a polydiallyldimethylammonium (PDDA) monolayer. These distributions were optimized as a function of the colloidal adsorption time. For both approaches, controllable and reproducible procedures are presented and discussed. The optical responses of the NH structures are related to the short-range ordering level, and their good performances as refractive index transducers are demonstrated.

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15

NAVASCUÉS, G., E. VELASCO, and L. MEDEROS. "THEORIES OF PHASE BEHAVIOR OF COLLOIDAL SUSPENSIONS." International Journal of Modern Physics B 18, no. 02 (January 20, 2004): 143–69. http://dx.doi.org/10.1142/s0217979204023787.

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Colloidal suspensions are ubiquitous in nature. They also occur in many processes of industrial and technological interest. However, an understanding of the basic microscopic interactions and the rich phase behavior exhibited by colloidal suspensions is still lacking. In the present paper we give a short overview of the different statistical-mechanical approaches that have been proposed to account for the phase behavior and phase transitions occurring in systems made up of spherical colloidal particles immersed in a fluid matrix of structureless solvent particles. Effective interactions in these systems are seen to be invariably of a very short-ranged nature, and particular emphasis is put on different models that very accurately approximate these interactions. A central theme of this review is the effect of correctly incorporating the correlation structure of the colloidal system into the statistical-mechanical treatment, and how this feature very decisively affects the quality of the theoretical predictions for the colloid thermodynamics and phase behavior. Based on the importance of the correlation structure, theories relying on perturbative expressions are seen to fail to a higher or lesser extent when applied to systems of particles interacting via short-ranged potentials, and a critical discussion is provided on different proposals to overcome these difficulties. In particular, a recently proposed self-consistent nonperturbative theory is reviewed, and some of its more recent applications are shown.

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16

Albrecht, R. M., and D. A. Meyer. "All That Glitters is not Gold: Approaches to Labeling for EM." Microscopy Today 10, no. 3 (May 2002): 24–26. http://dx.doi.org/10.1017/s1551929500058016.

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A large number of natural and synthetic species ranging from virus particles to small polymer beads have been employed over trie years as labels in electron microscopic applications. Perhaps the most useful and versatile of these labels are the colloidal heavy metals. The colloidal labels can be synthesized as round regular spheres in sizes from 1 to 150 nanometers in diameter and thus can be used where molecular and sub-molecular ranges of spatial resolution are required. They are electron “dense” and good emitters of secondary and back-scattered electrons and hence are readily detectable in both scanning electron microscopic imaging systems and transmission electron imaging systems. Larger particles, 10nm and above, can be identified via their shape in force based imaging systems.

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17

Hermansson, Anne-Marie, Maud Langton, and Niklas Lorén. "New Approaches to Characterizing Food Microstructures." MRS Bulletin 25, no. 12 (December 2000): 30–36. http://dx.doi.org/10.1557/mrs2000.251.

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Many food-processing operations are designed to create the microstructure that gives the food product its characteristic properties. From milk we can produce different cheeses, yogurts, spreads, or whipped products where the properties are determined by the structure. Other examples of fabricated foods are cereal products such as pasta, meat products such as sausages, and so on. All of these products are based on colloidal structures such as gels, emulsions, foams, or combinations thereof. Microscopy provides the tools for describing how a particular structure is engineered, and, therefore, how it relates to the properties of the product.

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18

Jun, J., L. Blum, and W. Haoping. "Theoretical approaches of stability ratio on concentrated colloidal dispersed system." Colloid & Polymer Science 273, no. 2 (February 1995): 175–81. http://dx.doi.org/10.1007/bf00654015.

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19

Rehage, Heinz, and Norbert Willenbacher. "Novel approaches to explain the rheological properties of colloidal structures." Current Opinion in Colloid & Interface Science 16, no. 1 (February 2011): 1–2. http://dx.doi.org/10.1016/j.cocis.2010.11.001.

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20

de Harven, E., D. Soligo, S. He, H. Christensen, and G. Bootsma. "Immunogold labeling of cell surface antigens: The Scanning Electron Microscope approaches." Proceedings, annual meeting, Electron Microscopy Society of America 45 (August 1987): 996–99. http://dx.doi.org/10.1017/s0424820100129255.

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The scanning electron microscope (SEM) has been used for many years to visualize the distribution of various antigens expressed on cell surfaces. Several markers were used for that purpose, as reviewed by Molday; they were recognized on cell surfaces on the basis of their size and/or shape. However, it is only after colloidal gold particles were demonstrated to be markers of almost universal applicability that the significance of inmuno-SEM in cell biology became evident. The unique properties of the colloidal gold marker can be summarized as follows: it can be prepared in a range of sizes (5 to 40 nm) which accommodates well the resolution of both TEM and SEM; under the light microscope it can be seen as a red stain, or under polarized light epi-illumination; almost all proteins can easily be electrostatically conjugated to it, without noticeable alteration of their biological properties;

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21

Chen, Tao, Debby P. Chang, Rainer Jordan, and Stefan Zauscher. "Colloidal lithography for fabricating patterned polymer-brush microstructures." Beilstein Journal of Nanotechnology 3 (May 15, 2012): 397–403. http://dx.doi.org/10.3762/bjnano.3.46.

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We exploit a series of robust, but simple and convenient colloidal lithography (CL) approaches, using a microsphere array as a mask or as a guiding template, and combine this with surface-initiated atom-transfer radical polymerization (SI-ATRP) to fabricate patterned polymer-brush microstructures. The advantages of the CL technique over other lithographic approaches for the fabrication of patterned polymer brushes are (i) that it can be carried out with commercially available colloidal particles at a relatively low cost, (ii) that no complex equipment is required to create the patterned templates with micro- and nanoscale features, and (iii) that polymer brush features are controlled simply by changing the size or chemical functionality of the microspheres or the substrate.

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22

Mahynski, Nathan A., Runfang Mao, Evan Pretti, Vincent K. Shen, and Jeetain Mittal. "Grand canonical inverse design of multicomponent colloidal crystals." Soft Matter 16, no. 13 (2020): 3187–94. http://dx.doi.org/10.1039/c9sm02426c.

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23

Vittorio, M., F. Pisanello, L. Martiradonna, A. Qualtieri, T. Stomeo, A. Bramati, and R. Cingolani. "Recent advances on single photon sources based on single colloidal nanocrystals." Opto-Electronics Review 18, no. 1 (January 1, 2010): 1–9. http://dx.doi.org/10.2478/s11772-009-0026-7.

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AbstractSingle colloidal quantum dots (QDs) are increasingly exploited as triggered sources of single photons. This review reports on recent results on single photon sources (SPS) based on colloidal quantum dots, whose size, shape and optical properties can be finely tuned by wet chemistry approach. First, we address the optical properties of different colloidal nanocrystals, such as dots, rods and dot in rods and their use as single photon sources will be discussed. Then, we describe different techniques for isolation and positioning single QDs, a major issue for fabrication of single photon sources, and various approaches for the embedding single nanocrystals inside microcavities. The insertion of single colloidal QDs in quantum confined optical systems allows one to improve their overall optical properties and performances in terms of efficiency, directionality, life time, and polarization control. Finally, electrical pumping of colloidal nanocrystals light emitting devices and of NC-based single photon sources is reviewed.

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Frungieri, Graziano, and Marco Vanni. "Shear-induced aggregation of colloidal particles: A comparison between two different approaches to the modelling of colloidal interactions." Canadian Journal of Chemical Engineering 95, no. 9 (April 17, 2017): 1768–80. http://dx.doi.org/10.1002/cjce.22843.

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25

Zhang, Xiaoliang, Carl Hägglund, and Erik M. J. Johansson. "Highly efficient, transparent and stable semitransparent colloidal quantum dot solar cells: a combined numerical modeling and experimental approach." Energy & Environmental Science 10, no. 1 (2017): 216–24. http://dx.doi.org/10.1039/c6ee02824a.

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Klein, R., and H. H. von Grünberg. "Charge-stabilized colloidal suspensions. Phase behavior and effects of confinement." Pure and Applied Chemistry 73, no. 11 (January 1, 2001): 1705–19. http://dx.doi.org/10.1351/pac200173111705.

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The PoissonBoltzmann (PB) equation is used to investigate effective colloid-interface interactions and the phase behavior of charge-stabilized colloidal suspensions. When a colloidal particle, immersed in an electrolyte, approaches an interface, which may be neutral (such as air) or charged (like electrodes, glass, etc.), image charge effects plus the deformation of the colloidal ion atmosphere by the interface lead to an effective interaction which can be attractive or repulsive, depending on the surface charge density and the dielectric constants of the interface and the electrolyte. Two cases are considered: i) a spherical particle near a like-charged interface, and ii) a rod-like particle in the vicinity of an oppositely charged interface. The latter serves as a model for the adsorption of (anionic) DNA on a cationic membrane, and it is shown that the effective attraction, induced by the release of counterions on approach of the DNA to the membrane, makes up an essential contribution to the total DNA-membrane effective interaction. To understand the phase behavior of charge-stabilized colloidal suspensions, we study a PB cell model of a bulk suspension and investigate how the PB equation can best be linearized. It is found that the previously predicted gasliquid phase coexistence results when the PB equation is linearized about the Donnan potential. No indication of such a spinodal instability could, however, be found, when the free energy is evaluated using the numerical solution of the full PB equation. This suggests that the predicted gasliquid phase coexistence is an artifact of the linearization.

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Galchenko, Michael, Raphael Schuster, Andres Black, Maria Riedner, and Christian Klinke. "Preparation of high-yield and ultra-pure Au25 nanoclusters: towards their implementation in real-world applications." Nanoscale 11, no. 4 (2019): 1988–94. http://dx.doi.org/10.1039/c8nr08200f.

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Munro, Andrea M. "Synthetic approaches for growing zinc sulfide and zinc selenide colloidal nanocrystals." Journal of Vacuum Science & Technology A 38, no. 2 (March 2020): 020805. http://dx.doi.org/10.1116/1.5141992.

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29

Gu, Jun, Ya-Wen Zhang, and Franklin (Feng) Tao. "Shape control of bimetallic nanocatalysts through well-designed colloidal chemistry approaches." Chemical Society Reviews 41, no. 24 (2012): 8050. http://dx.doi.org/10.1039/c2cs35184f.

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Lotito, Valeria, and Tomaso Zambelli. "Approaches to self-assembly of colloidal monolayers: A guide for nanotechnologists." Advances in Colloid and Interface Science 246 (August 2017): 217–74. http://dx.doi.org/10.1016/j.cis.2017.04.003.

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31

Delgado, Jorge A., Olivia Benkirane, Carmen Claver, Daniel Curulla-Ferré, and Cyril Godard. "Advances in the preparation of highly selective nanocatalysts for the semi-hydrogenation of alkynes using colloidal approaches." Dalton Transactions 46, no. 37 (2017): 12381–403. http://dx.doi.org/10.1039/c7dt01607g.

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Kanduč, Matej, Won Kyu Kim, Rafael Roa, and Joachim Dzubiella. "Modeling of stimuli-responsive nanoreactors: rational rate control towards the design of colloidal enzymes." Molecular Systems Design & Engineering 5, no. 3 (2020): 602–19. http://dx.doi.org/10.1039/c9me00106a.

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Responsive polymer-based nanoreactors exhibit complex structure-property-function relationships which require multi-scale modeling and simulation approaches for optimal design and a further development towards 'colloidal enzymes'.

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Nakayama, Masanari, Satoshi Kajiyama, Akihito Kumamoto, Yuichi Ikuhara, and Takashi Kato. "Bioinspired selective synthesis of liquid-crystalline nanocomposites: formation of calcium carbonate-based composite nanodisks and nanorods." Nanoscale Advances 2, no. 6 (2020): 2326–32. http://dx.doi.org/10.1039/d0na00130a.

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Colloidal nanodisk liquid-crystalline composites consisting of an acidic polymer and CaCO₃ are developed. Selective synthesis of nanodisk and nanorod is achieved by biomineralization-inspired approaches.

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Belenko, E. V., P. A. Sakharov, A. V. Khvatov, and Yu K. Lukanina. "Modeling of colloidal systems in technological processes." IOP Conference Series: Earth and Environmental Science 931, no. 1 (December 1, 2021): 012005. http://dx.doi.org/10.1088/1755-1315/931/1/012005.

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Abstract The article describes the main methods of mathematical modeling of industrial free-dispersed systems. The method of constructing the regression equation by the method of linear and nonlinear installation of coefficients is proposed. The fundamentals of tensor and harmonic approaches to the analysis of disperse systems are considered, which allow optimizing the equations of material and energy balance in the conditions of industrial operation of dispersions.

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Kassim, Syara, S. Padmanabhan, J. McGrath, and M. E. Pemble. "Preparation and Properties of Silica Inverse Opal via Self-Assembly." Applied Mechanics and Materials 699 (November 2014): 318–24. http://dx.doi.org/10.4028/www.scientific.net/amm.699.318.

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The bottom-up colloidal synthesis of photonic band gap (PBG) materials or photonic crystals (PC) has attracted considerable interest as compared to so-called top-down lithographic approaches due to the simple processing steps involved and the prospect of the economically viable production of complex 3-dimensional optical materials from simple colloidal particles. To date self-assembly techniques constitute the most popular approach to fabricate 3D photonic crystals from colloidal particle suspensions. Based on the natural tendency of monodisperse colloidal particles to organise into ordered arrays, this method represent the best option due to the ease of fabrication, ability to produce larger area samples and cost. Here we report on the fabrication of long range three-dimensional (3D) ordered poly (methyl methacrylate) (PMMA)-silica PC structures and the subsequent fabrication of robust silica inverse opals using self-assembly methods. The optical properties of these materials are described and discussed in terms of potential applications of these materials.

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Nobile, Concetta, and Pantaleo Davide Cozzoli. "Synthetic Approaches to Colloidal Nanocrystal Heterostructures Based on Metal and Metal-Oxide Materials." Nanomaterials 12, no. 10 (May 18, 2022): 1729. http://dx.doi.org/10.3390/nano12101729.

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Composite inorganic nanoarchitectures, based on combinations of distinct materials, represent advanced solid-state constructs, where coexistence and synergistic interactions among nonhomologous optical, magnetic, chemical, and catalytic properties lay a basis for the engineering of enhanced or even unconventional functionalities. Such systems thus hold relevance for both theoretical and applied nanotechnology-based research in diverse areas, spanning optics, electronics, energy management, (photo)catalysis, biomedicine, and environmental remediation. Wet-chemical colloidal synthetic techniques have now been refined to the point of allowing the fabrication of solution free-standing and easily processable multicomponent nanocrystals with sophisticated modular heterostructure, built upon a programmed spatial distribution of the crystal phase, composition, and anchored surface moieties. Such last-generation breeds of nanocrystals are thus composed of nanoscale domains of different materials, assembled controllably into core/shell or heteromer-type configurations through bonding epitaxial heterojunctions. This review offers a critical overview of achievements made in the design and synthetic elaboration of colloidal nanocrystal heterostructures based on diverse associations of transition metals (with emphasis on plasmonic metals) and transition-metal oxides. Synthetic strategies, all leveraging on the basic seed-mediated approach, are described and discussed with reference to the most credited mechanisms underpinning regioselective heteroepitaxial deposition. The unique properties and advanced applications allowed by such brand-new nanomaterials are also mentioned.

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Howes, Philip D., Rona Chandrawati, and Molly M. Stevens. "Colloidal nanoparticles as advanced biological sensors." Science 346, no. 6205 (October 2, 2014): 1247390. http://dx.doi.org/10.1126/science.1247390.

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Colloidal nanoparticle biosensors have received intense scientific attention and offer promising applications in both research and medicine. We review the state of the art in nanoparticle development, surface chemistry, and biosensing mechanisms, discussing how a range of technologies are contributing toward commercial and clinical translation. Recent examples of success include the ultrasensitive detection of cancer biomarkers in human serum and in vivo sensing of methyl mercury. We identify five key materials challenges, including the development of robust mass-scale nanoparticle synthesis methods, and five broader challenges, including the use of simulations and bioinformatics-driven experimental approaches for predictive modeling of biosensor performance. The resultant generation of nanoparticle biosensors will form the basis of high-performance analytical assays, effective multiplexed intracellular sensors, and sophisticated in vivo probes.

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Hu, Lian, Huizhen Wu, Zhengfen Wan, Chunfeng Cai, Tianning Xu, Tenggang Lou, and Bingpo Zhang. "Physical approaches to tuning the luminescence color patterns of colloidal quantum dots." New Journal of Physics 14, no. 1 (January 30, 2012): 013059. http://dx.doi.org/10.1088/1367-2630/14/1/013059.

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Khlebtsov, Nikolai G., Andrei G. Melnikov, and Vladimir A. Bogatyrev. "The linear dichroism and birefringence of colloidal dispersions: Approximate and exact approaches." Journal of Colloid and Interface Science 146, no. 2 (October 1991): 463–78. http://dx.doi.org/10.1016/0021-9797(91)90211-p.

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Perni, Stefano, Emily Callard Preedy, and Polina Prokopovich. "Success and failure of colloidal approaches in adhesion of microorganisms to surfaces." Advances in Colloid and Interface Science 206 (April 2014): 265–74. http://dx.doi.org/10.1016/j.cis.2013.11.008.

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Lee, Ilkeun, Ricardo Morales, Manuel A. Albiter, and Francisco Zaera. "Synthesis of heterogeneous catalysts with well shaped platinum particles to control reaction selectivity." Proceedings of the National Academy of Sciences 105, no. 40 (October 1, 2008): 15241–46. http://dx.doi.org/10.1073/pnas.0805691105.

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Colloidal and sol-gel procedures have been used to prepare heterogeneous catalysts consisting of platinum metal particles with narrow size distributions and well defined shapes dispersed on high-surface-area silica supports. The overall procedure was developed in three stages. First, tetrahedral and cubic colloidal metal particles were prepared in solution by using a procedure derived from that reported by El-Sayed and coworkers [Ahmadi TS, Wang ZL, Green TC, Henglein A, El-Sayed MA (1996) Science 272:1924–1926]. This method allowed size and shape to be controlled independently. Next, the colloidal particles were dispersed onto high-surface-area solids. Three approaches were attempted: (i) in situ reduction of the colloidal mixture in the presence of the support, (ii) in situ sol-gel synthesis of the support in the presence of the colloidal particles, and (iii) direct impregnation of the particles onto the support. Finally, the resulting catalysts were activated and tested for the promotion of carbon–carbon double-bond cis-trans isomerization reactions in olefins. Our results indicate that the selectivity of the reaction may be controlled by using supported catalysts with appropriate metal particle shapes.

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Vetter, Florian Lukas, and Jochen Strube. "Need for a Next Generation of Chromatography Models—Academic Demands for Thermodynamic Consistency and Industrial Requirements in Everyday Project Work." Processes 10, no. 4 (April 7, 2022): 715. http://dx.doi.org/10.3390/pr10040715.

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Process chromatography modelling for process development, design, and optimization as well as process control has been under development for decades. Still, the discussion of scientific potential and industrial applications needs is open to innovation. The discussion of next-generation modelling approaches starting from Langmuirian to steric mass action and multilayer or thermodynamic consistent real and ideal adsorption theory or colloidal particle adsorption approaches is continued.

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Qiao, Fen, Qian Wang, Zixia He, Qing Liu, and Aimin Liu. "Self-Assembly of Colloidal Nanorods Arrays." International Journal of Nanoscience 14, no. 01n02 (February 2015): 1460029. http://dx.doi.org/10.1142/s0219581x14600291.

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Recently, self-assembly of colloidal semiconductor nanocrystals (NCs) have attracted a great interest due to their flexible synthesis with tunable band gaps and shape-dependent optical and electronic properties. In particular, nanorods (NRs) superlattice is receiving considerable attention. Typically, the NRs superlattice is prepared by guiding the process of self-assembly through external forces. In this article, recent development of self-assembly approaches at work in fabricating NRs superlattices was reviewed. Despite those effective self-assembly techniques through external controls to obtain NCs assemblies during deposition were widespread used. But these techniques are time consuming, and cannot get rid of the organic capping insulated molecules surrounding the NCs. So there is still a challenge to guarantee the electron/hole dissociation as well as the charge transport of NCs. Here, thermal annealing method that applies selectivity even in the presence of organic molecules will be adopted to obtain colloidal NRs superlattices, and the self-assembly mechanism of NRs were briefly addressed.

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Nomura, Yosuke, Ilya V. Anoshkin, Chikaaki Okuda, Motoyuki Iijima, Yoshio Ukyo, Hidehiro Kamiya, Albert G. Nasibulin, and Esko I. Kauppinen. "Carbon Nanotube/Nanofibers and Graphite Hybrids for Li-Ion Battery Application." Journal of Nanomaterials 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/586241.

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To improve the electrical conductivity of negative electrodes of lithium ion batteries, we applied a direct CVD synthesis of carbon nanomaterials on the surface of graphite particles. To prepare a catalyst, two alternative approaches were utilized: colloidal nanoparticles (NPs) and metal (Ni and Co) nitrate salt precursors deposited on the graphite surface. Both colloidal and precursor systems allowed us to produce carbon nanofibers (CNFs) on the graphite surface with high coverage under the optimum CVD conditions. Electrical measurements revealed that the resistivity of the actual electrodes fabricated from CNFs coated graphite particles was about 40% lower compared to the original pristine graphite electrodes.

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Satriano, Cristina, and Maria Elena Fragalà. "Lipid vesicle adsorption on micropore arrays prepared by colloidal lithography-based deposition approaches." RSC Advances 2, no. 9 (2012): 3607. http://dx.doi.org/10.1039/c2ra20163a.

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Pradhan, Madhulika, Deependra Singh, and Manju Rawat Singh. "Novel colloidal carriers for psoriasis: Current issues, mechanistic insight and novel delivery approaches." Journal of Controlled Release 170, no. 3 (September 2013): 380–95. http://dx.doi.org/10.1016/j.jconrel.2013.05.020.

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Qi, Limin. "Colloidal chemical approaches to inorganic micro- and nanostructures with controlled morphologies and patterns." Coordination Chemistry Reviews 254, no. 9-10 (May 2010): 1054–71. http://dx.doi.org/10.1016/j.ccr.2010.02.005.

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Gu, Jun, Ya-Wen Zhang, and Franklin Tao. "ChemInform Abstract: Shape Control of Bimetallic Nanocatalysts Through Well-Designed Colloidal Chemistry Approaches." ChemInform 44, no. 13 (March 18, 2013): no. http://dx.doi.org/10.1002/chin.201313199.

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Ohshima, Hiroyuki. "Transient Electrophoresis of A Cylindrical Colloidal Particle." Fluids 7, no. 11 (October 29, 2022): 342. http://dx.doi.org/10.3390/fluids7110342.

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We develop the theory of transient electrophoresis of a weakly charged, infinitely long cylindrical colloidal particle under an application of a transverse or tangential step electric field. Transient electrophoretic mobility approaches steady electrophoretic mobility with time. We derive closed-form expressions for the transient electrophoretic mobility of a cylinder without involving numerical inverse Laplace transformations and the corresponding time-dependent transient Henry functions. The transient electrophoretic mobility of an arbitrarily oriented cylinder is also derived. It is shown that in contrast to the case of steady electrophoresis, the transient Henry function of an arbitrarily oriented cylinder at a finite time is significantly smaller than that of a sphere with the same radius and mass density as the cylinder so that a cylinder requires a much longer time to reach its steady mobility than the corresponding sphere.

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Fang, Huang, Michael F. Hagan, and W. Benjamin Rogers. "Two-step crystallization and solid–solid transitions in binary colloidal mixtures." Proceedings of the National Academy of Sciences 117, no. 45 (October 29, 2020): 27927–33. http://dx.doi.org/10.1073/pnas.2008561117.

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Crystallization is fundamental to materials science and is central to a variety of applications, ranging from the fabrication of silicon wafers for microelectronics to the determination of protein structures. The basic picture is that a crystal nucleates from a homogeneous fluid by a spontaneous fluctuation that kicks the system over a single free-energy barrier. However, it is becoming apparent that nucleation is often more complicated than this simple picture and, instead, can proceed via multiple transformations of metastable structures along the pathway to the thermodynamic minimum. In this article, we observe, characterize, and model crystallization pathways using DNA-coated colloids. We use optical microscopy to investigate the crystallization of a binary colloidal mixture with single-particle resolution. We observe classical one-step pathways and nonclassical two-step pathways that proceed via a solid–solid transformation of a crystal intermediate. We also use enhanced sampling to compute the free-energy landscapes corresponding to our experiments and show that both one- and two-step pathways are driven by thermodynamics alone. Specifically, the two-step solid–solid transition is governed by a competition between two different crystal phases with free energies that depend on the crystal size. These results extend our understanding of available pathways to crystallization, by showing that size-dependent thermodynamic forces can produce pathways with multiple crystal phases that interconvert without free-energy barriers and could provide approaches to controlling the self-assembly of materials made from colloids.

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