Search results for " printing"

New Developments in Soft Lithography

2003

Abstract The burgeoning area of soft lithography is reviewed with special emphasis on developments within the past three years. Applications in electronics have driven such developments, but more recently, other kinds of device structures and 3D prototyping have also found application, in part, through soft lithography. Microcontact printing (μCP), “lift off” μCP nano transfer printing (nTP), micromolding in capillaries (MIMIC), solvent assisted micromolding (SAMIM), replica molding (REM), and microtransfer molding are the main soft lithography schemes discussed.

Process parameters influence in additive manufacturing

2016

Additive manufacturing is a rapidly expanding technology. It allows the creation of very complex 3D objects by adding layers of material, in spite of the traditional production systems based on the removal of material. The development of additive technology has produced initially a generation of additive manufacturing techniques restricted to industrial applications, but their extraordinary degree of innovation has allowed the spreading of household systems. Nowadays, the most common domestic systems produce 3D parts through a fused deposition modeling process. Such systems have low productivity and make, usually, objects with no high accuracy and with unreliable mechanical properties. Thes…

k-Carrageenan and PVA blends as 3D printing bioinks for cartilage reconstruction scaffolding

2021

Miscele di k-carragenina e PVA come bio-inchiostri per stampa 3D di scaffold per la ricostruzione della cartilagine

2021

Introduzione La k-carragenina (kC) è un poligalattano solfato ottenuto da alghe rosse con un contenuto di estere-solfato dal 25 al 30% e una peso molecolare medio ben superiore a 100 kDa. È formato da unità alternate di D-galattosio e 3,6-anidro-galattosio (3,6-AG) unite da legami α-1,3 e β-1,4-glicosidici. [1] Il kC assomiglia ai glicosaminoglicani (GAG) che sono i costituenti centrali dei tessuti connettivi, può essere quindi studiato per produrre scaffold per l'ingegneria tissutale. Il kC è solubile in acqua a temperature superiori a 60 °C e può formare gel stabili raffreddandosi. Le reti di kC sono forti, fragili e l'assenza di porosità interconnesse può limitare la colonizzazione dell'…

Algorithmic modeling and prototyping of a structural joint for freeform surfaces

2016

This paper describes a parametric approach in architectural design through the elaboration of a process for generating non-standard structural joints particularly suitable for the arrangement of freeform surfaces in which maximum adaptability of the system is required to join a different number of members converging in a node from generic directions. The algorithmic definitions, developed using the graphical editor Grasshopper integrated with Rhinoceros, allow the management of an integrated workflow from the conceptual design of freeform surface to the prototyping of a structural joint with 3D printing techniques.

Architettura di transizione. Im Printing 3D

2018

In recent years, the development of additive construction methods for the production of physical models starting from computerized ones has led to a return from the digital domain to the material one. A new "digital materiality" associated with 3D printing makes it possible to extend the imaginary of the contemporary architectural scene by consolidating the strong relationship between research and innovation. 3D printing is a rapid prototyping technique that allows the direct transposition of the digital model into its analogous material using a computer controlled nozzle to deposit small doses of material and compose the figure in space.

Redrawing the Past, reimaiging the Future. Gamification project for the reinterpretation of historical architecture

2021

The objectives of the work we present concern the reinterpretation of architectural traces of the past with a "gamification" project for educational laboratories to be activated in schools of different order and grade. The methodology used starts from the 3D-reconstruction of disappeared architectures, urban plots where the stratification lends itself to different interpretations, based on the documentary information found and the hypotheses that can be spent directly from reading the artefact. Then it translates everything into diversified outputs to tell the evolution of the monument and the site and its conjectural reconfiguration: from immersive 3D visualization to 3D printing of modula…

Formazione e trasformazione di un'immagine urbana. Ricostruzioni architettoniche tra l'asse della via Notarbartolo e il secondo tronco della via Libe…

2022

The contribution presented here is part of a work-in-progress project, which has as its focus the “extra-moenia” urban transformations suffered by the city of Palermo after World War II, with the aim of cataloging, reconstructing and restoring the remarkable heritage -lost in the years of the economic boom and building speculation- in three-dimensional virtual images. The analysis is part of the urban context affected by the extension of via Libertà starting from the intersection with via Notarbartolo, the transversal directional axis conceived in the Giarrusso Plan of 1887 as a connection to the Shipyards and built starting from the subdivisions of Villa Carini in the years 1891-1902. This…

Sprawl Design Industries

2017

Il contributo presenta un caso studio imprenditoriale rilevante dal punto di vista della disciplina urbanistica annoverabile come modello in funzione della possibile replicabilità e diffusione anche in contesti “isolati” come quello sicano. La scheda è parte di una raccolta di casi studio che dimostrano come nel territorio siciliano, "a fronte di un’inadeguatezza delle istituzioni a rispondere ai bisogni delle comunità locali e nonostante la progressiva perdita di capitale umano che impoverisce il dinamismo imprenditoriale, siano presenti germogli di innovazione e scintille di creatività da parte di soggetti protagonisti di piccole/grandi trasformazioni sociali, anche in contesti rurali e u…

Opuntia Ficus Indica based green composites for NPK fertilizer controlled release produced by compression molding and fused deposition modeling

2022

Excessive fertilization causes ecological problems due to leaching issues. To solve this problem and promote agriculture sustainability an innovative green composite for controlled release fertilizers was produced by adding NPK fertilizer flour to a biodegradable polymer with or without Opuntia Ficus Indica (OFI) particles. Six for- mulations were produced and employed for the fabrication of devices both for compression molding and fused deposition modeling (FDM). Both fillers displayed a good dispersion in the composites, excellent adhesion with the polymeric matrix and effectively acted as reinforcement. The decrease of NPK release rate (up to 30 days) was achieved using whole composites …