Encontrados 18 documentos, a visualizar página 1 de 2
Diffusion of coloured silica nanoparticles into human hair
Gomes, Jaime Rocha; Sampaio, Sandra; Maia, FredericoA novel method for dyeing human hair fibres using coloured silica nanoparticles of 206 nm has been developed. Diffusion of coloured silica nanoparticles into hair fibres has been investigated; silica nanoparticles do not penetrate at all, or do so only sparingly, into the structure of Caucasian virgin hair. However, coloured silica nanoparticles diffused readily into bleached hair fibres. Scanning electron micr...
Colored nanoparticles for ecological dyeing of cellulosic fibers
Gomes, Jaime Rocha; Sampaio, Sandra; Martins, CésarDyeing cellulosic fibres with reactive dyes wastes great quantities of salt and water. The objective of this work is to dye cellulosic fibers using colored nanoparticles (CNPs) as an alternative to dyeing with reactive dyes. CNPs do not need salt nor soaping after dyeing, consuming less than 50% of water.
Ecological dyeing of cellulosic fibers with less salt, less water consumption a...
Gomes, Jaime Rocha; Sampaio, Sandra; Martins, CésarDyeing cellulosic fibres with reactive dyes wastes great quantities of salt and water. The objective of this work is to dye cellulosic fibers using coloured nanoparticles (CNPs) as an alternative to dyeing with reactive dyes, without salt and with only a short washing-off procedure at the end of dyeing. Samples of cotton were dyed by exhaustion with CNPs at light to medium colours. Washfastness results are give...
Study of the release of a microencapsulated acid dye in polyamide dyeing using ...
Sousa, Isabel S. C.; Castanheira, Elisabete M. S.; Gomes, Jaime Rocha; Oliveira, M. ElisabeteThe main objective of this work was to increase the retarding effect of the acid dye Telon Blue RR (C.I. Acid Blue 62) release on polyamide fibres dyeing by encapsulation of the dye in liposomes as an alternative to synthetic auxiliaries, in order to reduce effluent pollution. The retarding effect achieved with the use of mixed cationic liposomes of dioctadecyldimethylammonium bromide (DODAB)/soybean lecithin (...
Sol-gel technology for ecological dyeing cellulosic of fibres
Gomes, Jaime Rocha; Maia, Frederico; Sampaio, SandraDyeing cellulosic fibres with reactive dyes wastes great quantities of salt and water. The objective of this work is to dye cellulosic fibers using coloured nanoparticles (CNPs) as an alternative to dyeing with reactive dyes, without salt and with only a short washing-off procedure at the end of dyeing. Samples of cotton were dyed by exhaustion with CNPs at light to medium colours. Washfastness results are give...
A study on the spectral changes of reactive textile dyes and their implications...
Santos, Jorge Gomes; Soares, Graça M. B.; Hrdina, Radim; Campos, Ana M. F. Oliveira; Gomes, Jaime RochaEvidence is presented that confirms the colour changes of a widely used trichromatic mixture of bifunctional reactive dyes (Levafix CA) under alkaline conditions, showing that they occur slowly and throughout the dyeing time, and not instantly after alkali addition to the dyebath. Thus, it is impossible to determine the specific absorptivity of the dyes at each moment of the dyeing process. An investigation int...
The application of microcapsules of PCM in flame resistant non-woven materials
Gomes, Jaime Rocha; Cardoso, IsabelThe use of organic microcapsules of phase change materials (mPCM) has been gaining ground in technical textiles for temperature regulation and hence a means of keeping the body at a comfortable temperature when wearing impermeable protective clothes. However, for such applications as fire-fighter’s protective clothes, the standards require that all the material composing the material be fire resistant, includin...
Argamassas incorporando microcápsulas de materiais de mudança de fase (PCM), se...
Aguiar, J. L. Barroso de; Gomes, Jaime Rocha; Bragança, L.; Monteiro, José Manuel MacedoO presente invento diz respeito a argamassas para utilização em sistemas construtivos com maior eficácia de isolamento e, consequentemente, com possibilidade de aumentar a poupança de energia, e respectivo processo para a sua obtenção. Estas argamassas caracterizam-se por incorporarem microcápsulas de materiais de mudança de fase (PCM) apenas na camada de acabamento de entre as várias camadas que compõem o reve...
Argamassas com desempenho térmico melhorado
Monteiro, José M.; Aguiar, J. L. Barroso de; Bragança, L.; Gomes, Jaime Rocha; Santos, P.No contexto da investigação de novas tecnologias no domínio da conservação de energia surgem os “Phase Change Materials” (PCM) cuja principal característica é a mudança de fase (fase líquida para fase sólida e vice-versa) próximo à temperatura ambiente. O objecto desta comunicação é a divulgação de uma nova tecnologia, no domínio da técnica de aplicação de argamassas, que poderá ser utilizada na construção dos ...
How to improve dyeing and antimicrobial properties of cotton materials
Soares, Graça M. B.; Silva, Raquel; Vieira, Raquel; Santos, Jorge Gomes; Gomes, Jaime RochaComunicação apresentada no 20th IFATCC Congress, Weimer, Germany, 5 - 6 Maio 2005. ; In the present work, some specific amino compounds were linked to the cotton fabrics on a process that can impart at the same time dyeability and durable antimicrobial properties. The process was monitored on-line in a prototype dyeing system since the addition of cationic agents will influence dye uptake. Different dyeing con...
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